Paralleling of LLC Resonant Converters using Frequency Controlled Current Balancing
|
|
- Chad King
- 5 years ago
- Views:
Transcription
1 PESC8, Rhodes, Greece Paralleling of LLC Resonant Converters using Frequency Controlled Current Balancing H. Figge *, T. Grote *, N. Froehleke *, J. Boecker * and P. Ide ** * University of Paderborn, Power Electronics and Electric Drives, Germany ** DELTA Energy Systems GmbH, Soest, Germany Abstract Paralleling of two LLC resonant converters leads to a significant reduction of current stress in the output filter capacitor, provided that the driving signals of both converters are of equal frequency and with constant phase shift of 9. However, non influenceable tolerances of the circuit elements, especially those of the resonant tank circuit, cause unbalanced power distribution between the paralleled converters, resulting in suboptimal circuit design. Frequency controlled current balancing is proposed as remedy in this paper, and prototype measurements are presented to demonstrate the functional capability. nv o V / g I. INTRODUCTION The LLC series resonant converter (Fig. ) was largely overlooked and is recently considered suitable for isolated DC/DC conversion in high power SMPS, improving light load efficiency and the aspect of cost [][]. However, whereas the LLC resonant converter works fine for high voltage applications, its applicability for low voltage and high power applications, such as server or telecom power supplies, requires an enhancement of the first order capacitive output filter. Because the output of the LLC resonant circuit injects a sine wave of current into the rectifier and output filter capacitor, there will be a significant ac component at double switching frequency superimposed on the dc output voltage due to the p.d. at the ESR of the filter capacitor. As a common workaround, adding an additional second order filter to the output may eliminate the ac component of the output voltage but efficiency and power density will suffer. A more general approach for reducing the ac component of the converter output voltage is by phase shifted paralleling of multiple converter modules. Several publications have addressed this method in the past [6]. However, applying phase shifted paralleling to the LLC converter topology, a balanced power distribution between the single converter modules has to be ensured for proper Figure. LLC resonant converter drawn as half bridge topology Figure. Load dependency of LLC converter voltage gain for a worst case set of component values (A and B) power supply function. It is obvious, that unpredictable component tolerances of the circuit elements cause more or less unbalanced power distribution between the paralleled converter modules. In order to demonstrate the impact of component tolerances, the following assumptions are made for the component values: Resonant Inductance L s : ± 5% Resonant Capacitance C s : ± 5% Therefore the worst case of component combinations for two LLC resonant converters A and B can be described as L L ( + %) () sa = sb C C ( + %) () sa = sb The impact of above mentioned tolerances on the voltage gain of the LLC converter is shown in Fig.. The analysis of the voltage gain characteristic is based on the well known fundamental frequency method [8]. Commonly used definitions are: resonant frequency: f = /( L s C ) s characteristic impedance: Z = L s / Cs normalized load: Q = 8Z /( π n RL ) inductance ratio: h = L m / Ls normalized switching frequency: F = f s / f
2 It can be clearly seen that balanced power distribution of the LLC converters A and B can only be achieved for a single operating point. Considering e.g. Q =.5, only converter B is distributing power. Further differences of the voltage gain characteristic can result from tolerances of the inductance ratio h and the characteristic impedance Z. Although converter losses will reduce the effect of unbalanced power distribution, active current balancing seems to be essential for reliable operation of paralleled LLC converters. Active current balancing methods typically use the respective control variable of each converter to maintain load balance [6]. In case of resonant converters, the preferred control variable is the switching frequency f s, as for PWM control of resonant converters soft switching of the inverter semiconductors is lost. Since phase shifted paralleling of LLC resonant converters requires the switching frequency of each converter to be the same, an alternative current balancing method is proposed in this paper and a prototype is presented to verify the functional capability. II. PRINCIPLE OF OPERATION A. The Effect of Different Gain Characteristics Although the phase synchronization of two paralleled LLC converters impedes the use of common active current sharing methods, the dc gain characteristic of the LLC converter can be used to realize frequency controlled current balancing. Fig. 3 shows the typical gain characteristic of the LLC converter. The slope of the dc gain depends on the inductance ratio h assuming the normalized load Q being constant. nv o V / g 4 /db h =,3,4,5 Q = Normalized Frequency (F) Figure 3. DC gain curves of the LLC resonant circuit vs. normalized switching frequency F for different values of the inductance ratio h and constant normalized load Q As the basic idea of this work, paralleling of two converters with different dc gain characteristics introduces well defined dependence between the switching frequency f s and the symmetry of output currents. B. Considering Part Tolerances The preferred operating region of the LLC converter is below but near the resonant frequency f. This is due to reduced voltage stress of the output rectifier diodes below resonance (discontinuous conduction mode) and the lower rms value of the resonant current near to the resonant frequency f []. In order to ensure operation below resonance the part tolerances of the resonant circuit elements have to be taken into account. The impact of the tolerances on the resulting operating region of the LLC converter is demonstrated in Fig. 4. The first graph shows equal resonant frequencies (f A = f B ), but different dc gain slope of converter A and B, realized by adjusting the inductance L m of each converter A and B to the values h A = 8 and h B = 4, thus nv o V / g - /db - - h B L ma > L mb and h A > h B. (3) At the intersection of the curves the point of balanced load sharing is obtained. It appears for F =, thus at the identical resonant frequency of both converters. For the second and third graph, two different cases are investigated: L sa = 5% L sb (second graph) L sb = 5% L sa (third graph) h B h B h A h A h A f A = f B f A < f B f A > f B point of balanced load sharing point of balanced load sharing point of balanced load sharing Normalized Frequency (F) Figure 4. DC gain curves of LLC resonant circuit for different cases: operating point at resonance (f s = f A = f B ) operation point below resonance (f A < f B < f s ) operating point above resonance (f s > f A > f B ) Normalized frequency scaled to F = f s / f A Note, that the point of balanced load sharing moves either below resonance (f A < f B ), or above resonance (f A > f B ). For the preferred operation below resonance, the design of the values L s and C s must ensure that the point of balanced load sharing does not move beyond the resonant frequency of converter A. Considering the example of Fig. 3, second graph, operation below resonance can be ensured for L s = ± 7.5%, if the tolerance of C s is neglected. Of course for a real design, tolerance of C s has to be considered, too.
3 III. DESIGN PROCEDURE In the last years several discussions have been published in literature about the design of LLC resonant converters in the scope of front end dc-dc conversion [][][5]. However, because of the distinctive load characteristic of the LLC converter it is difficult to state a general approach for LLC circuit design. The essential design procedure can be summarized as follows: The specifications of input voltage, output voltage, switching frequency and maximal load must be treated to evaluate the maximal normalized load Q max, inductance ratio h and resonant frequency f of the final converter [5]. Based on these values, the circuit element values L s, C s and L m can be calculated. Nevertheless, there are still degrees of freedom in the design procedure, which can cover e.g. component stress or efficiency optimization. Yet another difficulty is the lack of an accurate analytical description of the transfer characteristic of the LLC converter. The fundamental frequency method can only be used for an approximative description of the transfer characteristic, and accurate methods, such as discrete time analysis, Extended Describing Functions [] or even Simulation, are complex and time consuming. Hence, for the design process of the proposed synchronized paralleling of two LLC converters a special simplification is proposed. Furthermore, the maximal allowed normalized load Q max versus resonant voltage amplitude v Csmax can be expressed as: Qmax ( F, h, vcs max ) v Cs max 4Fh + (4Fh + π ( F )) πh Vg / A special aspect in the design of resonant converters is over current protection. A convenient method is diode clamping of the resonant capacitance, when it is split into two capacitances C s / as shown in Fig. 6 []. In this configuration Diodes D 3 resp. D 4 become conducting if the resonant voltage v Cs reaches upper (=V g ) or lower (=V) voltage rail, resulting in freewheeling of resonant current and limited power transfer. (5) i const = Iˆ m m Figure 6. Half bridge LLC resonant converter modified for over current protection v ( T/ ) v Cs Csmax Figure 5. Calculated converter waveforms at nominal load The design is carried out at the point of nominal load. Fig.5 shows calculated converter waveforms at nominal load. Note, that the resonant voltage amplitude v Csmax is preliminary considered to be just lower than half of the input voltage V g in case of half bridge configuration. Therefore the resonant current i r can be assumed to be constant for t < t < T/ (T: switching period). Utilizing the described simplifications, the converter gain can be expressed analytically as: First step in the design process is to choose the magnetizing inductance L ma in order to set the peak value of the magnetizing current Î ma. Because Î m represents the turn-off current for the primary MOSFETs, the magnetizing current should be small to minimize reactive power loss but also large enough to discharge the MOSFET output capacitance C oss in order to achieve Zero Voltage Switching. The final design step is of an iterative nature. Choosing values for the ratio of the main inductances L ma /L mb the ratio of the resonant inductances L sa /L sb the ratio of the resonant capacitances C sa /C sb the aspired switching frequency f Z, the final design must fulfill the above mentioned design criteria s under worst case conditions of part tolerances. To proof the aspired switching frequency f Z, using (4), M(f Z,h A ) = M(f Z,h B ) can be solved to M ( F, h) = π + 4 ( ) h F. (4) f h f h B A A B Z = hb ha f. (6) To proof the maximum allowed resonant voltage amplitude v Csmax, (5) can be used by setting v Csmax to V g and plotting Q max versus h as demonstrated in Fig. 7.
4 TABLE I SPECIFICATION OF A SINGLE LLC CONVERTER V g V o 3 V 48 V n 3 P o I o f s kw.8 A khz TABLE II CIRCUIT PARAMETERS OBTAINED FROM THE DESIGN PROCESS Converter A Converter B f s 6 khz 3 khz L m 9 µh 5 µh Figure 7. Verifying circuit design in regard to overcurrent protection by means of Q-h diagram It is beyond the scope of this paper to give an accurate design procedure for the paralleling of LLC resonant converters, because an exact description of the LLC converter characteristic requires the use of improved afore mentioned analysis methods. IV. PROTOTYPE Synchronized Paralleling of LLC resonant converters reduces the ac component of the output voltage, but it restricts the applied switching frequency to the point of balanced load sharing. Besides other possible applications, a three stage power supply structure as investigated in [4] was chosen to evaluate the functional capability of the proposed method using a prototype sample. The isolating dc-dc stage of the three stage structure seems to be well suited to comprise the proposed synchronized paralleling of two LLC converters. As shown in Fig. 8, an additional non-isolating buck converter is used to control the output voltage V o and to comply with hold up requirements for front end power supplies. For a prototype design the specification given in Table I h.. L s 8. µh 7.7 µh C s 66 nf 66 nf was selected. The total output power of both converters is kw and the total output current 4.6 A at 48 V output voltage. Applying the design process described in section III and considering part tolerances of Lm: ± 4% Ls: ± 4% Cs: ± %, the parameters given in Table II result. However, for performance evaluation the exact circuit element values are used in the prototype sample. The measurement results shown in Fig. 9 demonstrate the static behavior of the current balancing functionality. The total input current splits into converter A and B depending on the actual switching frequency. At about khz, the input current of each converter is equal, and due to the same input voltage, the input power as well. d voltage control balanced load control + - i oa i ob Vo V g LLC A PFC 4 VDC 3 VDC Buck 48 VDC Load hold up V g LLC B Figure 8. Example of SMPS with paralleled LLC resonant converters
5 input current / A LLC Converter A LLC Converter B 4,5 4, 3,7 3,3,9,5 8 9 Fig. depicts the stationary behavior of the implemented current balancing control. The frequency variation ranges from about 3.5 khz to about 5 khz for the upper half of the output power spectrum and therefore is very small. The overall frequency range of about 7 khz is also acceptable. Note, that no measurement for the worst case of component tolerances was conducted, yet. The dynamic behavior of the current balancing control is demonstrated in Fig.. Furthermore stability of the control loop is achieved in the total operating range. Frequency / khz Figure 9. Measurement of input current split versus switching frequency at 5% of rated output power input current of LLC converters A and B (.54A/Div) W 5W 4W Amplitude / db Phase / degree Frequency / Hz Figure. Measurement of small signal characteristic between switching frequency (f s ) and current balance (i ob - i oa ) switching frequency (5kHz/Div, ac) t (ms/div) Figure. Step load measurement with levels of 5 W and W of output power The LLC resonant converter topology is broadly accepted to be a candidate for high efficient dc to dc power conversion. However, the three stage approach of a power supply structure [4] used in this work can not be a high efficiency design because the additional non isolating buck converter gives to much penalty to the overall efficiency. Nevertheless, the proper function of the proposed method was evaluated and can be adopted to other power supply structures. For the controller design of the current balancing control loop the small signal characteristic was measured by an impedance analyzer (see Fig. ). A PID-T type controller was chosen to regulate the current balance. switching frequency / khz efficiency / % output power / W Figure 3. Efficiency of the paralleled LLC converters; measurements for different MOSFET types output power / W Figure. Regulated switching frequency versus output power An efficiency measurement of the LLC stage is shown in Fig. 3. The measurement was conducted for two MOSFET types of different on state resistance R DSon. The
6 8 mω type MOSFET gives a % decrease at full load compared to the 9 mω type. The ac component of the output voltage at full load is approximately 4 mv, which is in the range of % of the dc output voltage (Fig. 4). The capacitive output filter with a total capacitance of 3 mf comprises three 63 V rated electrolytic capacitors with mf capacitance each. i ra u o (5mV/Div) Δu o 4mV i rb (A/Div) t (μs/div) Figure 4. AC component of output voltage at rated load V. CONCLUSION AND OUTLOOK Phase shifted paralleling of two LLC resonant converters reduces the current stress in the output filter capacitor. Reliable operation of two paralleled and phase shifted LLC resonant converters seems to be possible if frequency controlled current balancing is applied. Therefore, component tolerances of the resonant circuit elements have to be considered in the design procedure. To demonstrate the functional capability of the current balancing control, a power supply prototype consisting of a three stage converter structure has been presented. More applications can be investigated in the future. ACKNOWLEDGMENT The Author thanks various electrical engineers at Delta Energy Systems GmbH, Soest for their encouragement. REFERENCES [] B. Yang: Topology Investigation for Front End DC/DC Power Conversion for Distributed Power System, Dissertation Virginia Polytechnic Institute and State University, 3. [] B.Yang, F.C. Lee, A.J. Zhang, and G. Huang: LLC Resonant Converter for Front End DC/DC Conversion, APEC, vol., pp. 8-. [3] J.F. Lazar and R. Martinelli: Steady-State Analysis of the LLC Series Resonant Converter, APEC, vol., pp [4] H. Wetzel, N. Fröhleke, J. Böcker, and P. Ide: High Efficient 3kW Three-Stage Power Supply, APEC 6, pp [5] B. Lu, W. Liu, Y. Liang, F.C. Lee, and J.D. van Wyk: Optimal Design Methodology for LLC Resonant Converter, APEC 6, pp [6] S. Luo, Z. Ye, R.L. Lin, and F.C. Lee: A classification and evaluation of paralleling methods for power supply modules, PESC 999, vol., pp [7] J. Ben Klaassens, W.L.F.H.A. Moize de Chateleux, and M.P.N. van Wesenbeeck: Phase-Staggering Control of a Series-Resonant DC-DC Converter with Paralleled Power Modules, IEEE Trans. Power Electron., vol. 3, pp , April 988. [8] I. Batarseh: Resonant Converter Topologies with Three and Four Energy Storage Elements, IEEE Trans. Power Electron., vol. 9, pp , Jan. 994.
Small Signal Analysis for LLC Resonant Converter
Small Signal Analysis for LLC Resonant Converter Bo Yang and Fred C. Lee Center for Power Electronic Systems Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and
More informationIN THE high power isolated dc/dc applications, full bridge
354 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 2, MARCH 2006 A Novel Zero-Current-Transition Full Bridge DC/DC Converter Junming Zhang, Xiaogao Xie, Xinke Wu, Guoliang Wu, and Zhaoming Qian,
More informationCost effective resonant DC-DC converter for hi-power and wide load range operation.
Cost effective resonant DC-DC converter for hi-power and wide load range operation. Alexander Isurin(sashai@vanner.com) and Alexander Cook(alecc@vanner.com) Vanner Inc, Hilliard, Ohio Abstract- This paper
More informationA Double ZVS-PWM Active-Clamping Forward Converter: Analysis, Design, and Experimentation
IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 16, NO. 6, NOVEMBER 2001 745 A Double ZVS-PWM Active-Clamping Forward Converter: Analysis, Design, and Experimentation René Torrico-Bascopé, Member, IEEE, and
More informationA Novel Concept in Integrating PFC and DC/DC Converters *
A Novel Concept in Integrating PFC and DC/DC Converters * Pit-Leong Wong and Fred C. Lee Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic
More informationA Novel Transformer Structure for High power, High Frequency converter
A Novel Transformer Structure for High power, High Frequency converter Chao Yan, Fan Li, Jianhong Zeng, Teng Liu, Jianping Ying Delta Power Electronics Center 238 Minxia Road, Caolu Industry Zone, Pudong,
More informationCHAPTER 4 PI CONTROLLER BASED LCL RESONANT CONVERTER
61 CHAPTER 4 PI CONTROLLER BASED LCL RESONANT CONVERTER This Chapter deals with the procedure of embedding PI controller in the ARM processor LPC2148. The error signal which is generated from the reference
More informationA Single Phase Single Stage AC/DC Converter with High Input Power Factor and Tight Output Voltage Regulation
638 Progress In Electromagnetics Research Symposium 2006, Cambridge, USA, March 26-29 A Single Phase Single Stage AC/DC Converter with High Input Power Factor and Tight Output Voltage Regulation A. K.
More informationDesign considerations for a Half- Bridge LLC resonant converter
Design considerations for a Half- Bridge LLC resonant converter Why an HB LLC converter Agenda Configurations of the HB LLC converter and a resonant tank Operating states of the HB LLC HB LLC converter
More informationSINGLE STAGE LOW FREQUENCY ELECTRONIC BALLAST FOR HID LAMPS
SINGLE STAGE LOW FREQUENCY ELECTRONIC BALLAST FOR HID LAMPS SUMAN TOLANUR 1 & S.N KESHAVA MURTHY 2 1,2 EEE Dept., SSIT Tumkur E-mail : sumantolanur@gmail.com Abstract - The paper presents a single-stage
More informationChapter 6. Small signal analysis and control design of LLC converter
Chapter 6 Small signal analysis and control design of LLC converter 6.1 Introduction In previous chapters, the characteristic, design and advantages of LLC resonant converter were discussed. As demonstrated
More informationThe Effect of Ripple Steering on Control Loop Stability for a CCM PFC Boost Converter
The Effect of Ripple Steering on Control Loop Stability for a CCM PFC Boost Converter Fariborz Musavi, Murray Edington Department of Research, Engineering Delta-Q Technologies Corp. Burnaby, BC, Canada
More informationCHAPTER 2 A SERIES PARALLEL RESONANT CONVERTER WITH OPEN LOOP CONTROL
14 CHAPTER 2 A SERIES PARALLEL RESONANT CONVERTER WITH OPEN LOOP CONTROL 2.1 INTRODUCTION Power electronics devices have many advantages over the traditional power devices in many aspects such as converting
More informationPrecise Analytical Solution for the Peak Gain of LLC Resonant Converters
680 Journal of Power Electronics, Vol. 0, No. 6, November 200 JPE 0-6-4 Precise Analytical Solution for the Peak Gain of LLC Resonant Converters Sung-Soo Hong, Sang-Ho Cho, Chung-Wook Roh, and Sang-Kyoo
More informationA Bidirectional Series-Resonant Converter For Energy Storage System in DC Microgrids
IOSR Journal of Engineering (IOSRJEN) ISSN (e): 2250-3021, ISSN (p): 2278-8719 PP 01-09 www.iosrjen.org A Bidirectional Series-Resonant Converter For Energy Storage System in DC Microgrids Limsha T M 1,
More informationVishay Siliconix AN724 Designing A High-Frequency, Self-Resonant Reset Forward DC/DC For Telecom Using Si9118/9 PWM/PSM Controller.
AN724 Designing A High-Frequency, Self-Resonant Reset Forward DC/DC For Telecom Using Si9118/9 PWM/PSM Controller by Thong Huynh FEATURES Fixed Telecom Input Voltage Range: 30 V to 80 V 5-V Output Voltage,
More informationA LLC RESONANT CONVERTER WITH ZERO CROSSING NOISE FILTER
A LLC RESONANT CONVERTER WITH ZERO CROSSING NOISE FILTER M. Mohamed Razeeth # and K. Kasirajan * # PG Research Scholar, Power Electronics and Drives, Einstein College of Engineering, Tirunelveli, India
More informationComprehensive Topological Analyses of Isolated Resonant Converters in PEV Battery Charging Applications
Comprehensive Topological Analyses of Isolated Resonant Converters in PEV Battery Charging Applications Haoyu Wang, Student Member, IEEE, and Alireza Khaligh, Senior Member, IEEE Power Electronics, Energy
More informationImprovements of LLC Resonant Converter
Chapter 5 Improvements of LLC Resonant Converter From previous chapter, the characteristic and design of LLC resonant converter were discussed. In this chapter, two improvements for LLC resonant converter
More informationA New ZVS Bidirectional DC-DC Converter With Phase-Shift Plus PWM Control Scheme
A New ZVS Bidirectional DC-DC Converter With Phase-Shift Plus PWM Control Scheme Huafeng Xiao, Liang Guo, Shaojun Xie College of Automation Engineering,Nanjing University of Aeronautics and Astronautics
More informationLLC Resonant Converter for Battery Charging Application
International Journal of Electrical Engineering. ISSN 0974-2158 Volume 8, Number 4 (2015), pp. 379-388 International Research Publication House http://www.irphouse.com LLC Resonant Converter for Battery
More informationSINGLE-STAGE HIGH-POWER-FACTOR SELF-OSCILLATING ELECTRONIC BALLAST FOR FLUORESCENT LAMPS WITH SOFT START
SINGLE-STAGE HIGH-POWER-FACTOR SELF-OSCILLATING ELECTRONIC BALLAST FOR FLUORESCENT S WITH SOFT START Abstract: In this paper a new solution to implement and control a single-stage electronic ballast based
More informationI. INTRODUCTION II. LITERATURE REVIEW
ISSN XXXX XXXX 2017 IJESC Research Article Volume 7 Issue No.11 Non-Isolated Voltage Quadrupler DC-DC Converter with Low Switching Voltage Stress Praveen Kumar Darur 1, Nandem Sandeep Kumar 2, Dr.P.V.N.Prasad
More informationUltra Compact Three-Phase Rectifier with Electronic Smoothing Inductor
Ultra Compact ThreePhase Rectifier with Electronic Smoothing Inductor K. Mino, M.. Heldwein, J. W. Kolar Swiss Federal Institute of Technology (ETH) Zurich Power Electronic Systems aboratory ETH Zentrum
More informationPower Factor Corrected Single Stage AC-DC Full Bridge Resonant Converter
Power Factor Corrected Single Stage AC-DC Full Bridge Resonant Converter Gokul P H Mar Baselios College of Engineering Mar Ivanios Vidya Nagar, Nalanchira C Sojy Rajan Assisstant Professor Mar Baselios
More informationCHAPTER 3. SINGLE-STAGE PFC TOPOLOGY GENERALIZATION AND VARIATIONS
CHAPTER 3. SINGLE-STAGE PFC TOPOLOG GENERALIATION AND VARIATIONS 3.1. INTRODUCTION The original DCM S 2 PFC topology offers a simple integration of the DCM boost rectifier and the PWM DC/DC converter.
More informationA Novel Technique to Reduce the Switching Losses in a Synchronous Buck Converter
A Novel Technique to Reduce the Switching Losses in a Synchronous Buck Converter A. K. Panda and Aroul. K Abstract--This paper proposes a zero-voltage transition (ZVT) PWM synchronous buck converter, which
More informationResonant Power Conversion
Resonant Power Conversion Prof. Bob Erickson Colorado Power Electronics Center Department of Electrical, Computer, and Energy Engineering University of Colorado, Boulder Outline. Introduction to resonant
More informationComparison Between CCM Single-Stage And Two-Stage Boost PFC Converters *
Comparison Between CCM Single-Stage And Two-Stage Boost PFC Converters * Jindong Zhang 1, Milan M. Jovanoviü, and Fred C. Lee 1 1 Center for Power Electronics Systems The Bradley Department of Electrical
More informationCHAPTER 3 DC-DC CONVERTER TOPOLOGIES
47 CHAPTER 3 DC-DC CONVERTER TOPOLOGIES 3.1 INTRODUCTION In recent decades, much research efforts are directed towards finding an isolated DC-DC converter with high volumetric power density, low electro
More informationHigh-Efficiency Forward Transformer Reset Scheme Utilizes Integrated DC-DC Switcher IC Function
High-Efficiency Forward Transformer Reset Scheme Utilizes Integrated DC-DC Switcher IC Function Author: Tiziano Pastore Power Integrations GmbH Germany Abstract: This paper discusses a simple high-efficiency
More informationLLC Resonant Half Bridge Converter
LLC Resonant Half Bridge Converter Asia Tech-Day August 17 to 7, 009 Hong Huang Applications Engineer Outline Introduction to LLC resonant half bridge converter Benefits Operation principle Design challenges
More informationLLC Resonant Converter with Capacitor Diode Clamped Current Limiting Fundamental Harmonic Approximation
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p-ISSN: 2278-8735 PP 57-62 www.iosrjournals.org LLC Resonant Converter with Capacitor Diode Clamped Current Limiting
More informationDesign and Simulation of New Efficient Bridgeless AC- DC CUK Rectifier for PFC Application
Design and Simulation of New Efficient Bridgeless AC- DC CUK Rectifier for PFC Application Thomas Mathew.T PG Student, St. Joseph s College of Engineering, C.Naresh, M.E.(P.hd) Associate Professor, St.
More informationA Color LED Driver Implemented by the Active Clamp Forward Converter
A Color LED Driver Implemented by the Active Clamp Forward Converter C. H. Chang, H. L. Cheng, C. A. Cheng, E. C. Chang * Power Electronics Laboratory, Department of Electrical Engineering I-Shou University,
More informationDUAL BRIDGE LLC RESONANT CONVERTER WITH FREQUENCY ADAPTIVE PHASE-SHIFT MODULATION CONTROL FOR WIDE VOLTAGE GAIN RANGE
DUAL BRIDGE LLC RESONANT CONVERTER WITH FREQUENCY ADAPTIVE PHASE-SHIFT MODULATION CONTROL FOR WIDE VOLTAGE GAIN RANGE S M SHOWYBUL ISLAM SHAKIB ELECTRICAL ENGINEERING UNIVERSITI OF MALAYA KUALA LUMPUR,
More informationComparison Between two Single-Switch Isolated Flyback and Forward High-Quality Rectifiers for Low Power Applications
Comparison Between two ingle-witch Isolated Flyback and Forward High-Quality Rectifiers for Low Power Applications G. piazzi,. Buso Department of Electronics and Informatics - University of Padova Via
More informationA Novel Single-Stage Push Pull Electronic Ballast With High Input Power Factor
770 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 48, NO. 4, AUGUST 2001 A Novel Single-Stage Push Pull Electronic Ballast With High Input Power Factor Chang-Shiarn Lin, Member, IEEE, and Chern-Lin
More informationDC-DC Transformer Multiphase Converter with Transformer Coupling for Two-Stage Architecture
DC-DC Transformer Multiphase Converter with Transformer Coupling for Two-Stage Architecture M.C.Gonzalez, P.Alou, O.Garcia,J.A. Oliver and J.A.Cobos Centro de Electrónica Industrial Universidad Politécnica
More informationDC Transformer. DCX derivation: basic idea
DC Transformer Ultimate switched-mode power converter: Minimum possible voltage and current stresses on all components Zero-voltage switching of all semiconductor devices It is possible to approach the
More informationMOST electrical systems in the telecommunications field
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 46, NO. 2, APRIL 1999 261 A Single-Stage Zero-Voltage Zero-Current-Switched Full-Bridge DC Power Supply with Extended Load Power Range Praveen K. Jain,
More informationMethodology for testing a regulator in a DC/DC Buck Converter using Bode 100 and SpCard
Methodology for testing a regulator in a DC/DC Buck Converter using Bode 100 and SpCard J. M. Molina. Abstract Power Electronic Engineers spend a lot of time designing their controls, nevertheless they
More informationForward with Active Clamp for space applications: clamp capacitor, dynamic specifications and EMI filter impact on the power stage design
Forward with Active Clamp for space applications: clamp capacitor, dynamic specifications and EMI filter impact on the power stage design G. Salinas, B. Stevanović, P. Alou, J. A. Oliver, M. Vasić, J.
More informationReduction of Voltage Stresses in Buck-Boost-Type Power Factor Correctors Operating in Boundary Conduction Mode
Reduction of oltage Stresses in Buck-Boost-Type Power Factor Correctors Operating in Boundary Conduction Mode ars Petersen Institute of Electric Power Engineering Technical University of Denmark Building
More information새로운무손실다이오드클램프회로를채택한두개의트랜스포머를갖는영전압스위칭풀브릿지컨버터
새로운무손실다이오드클램프회로를채택한두개의트랜스포머를갖는영전압스위칭풀브릿지컨버터 윤현기, 한상규, 박진식, 문건우, 윤명중한국과학기술원 Zero-Voltage Switching Two-Transformer Full-Bridge PWM Converter With Lossless Diode-Clamp Rectifier H.K. Yoon, S.K. Han, J.S.
More informationNovel Zero-Current-Switching (ZCS) PWM Switch Cell Minimizing Additional Conduction Loss
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 49, NO. 1, FEBRUARY 2002 165 Novel Zero-Current-Switching (ZCS) PWM Switch Cell Minimizing Additional Conduction Loss Hang-Seok Choi, Student Member, IEEE,
More informationNEW microprocessor technologies demand lower and lower
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 41, NO. 5, SEPTEMBER/OCTOBER 2005 1307 New Self-Driven Synchronous Rectification System for Converters With a Symmetrically Driven Transformer Arturo Fernández,
More informationTHE converter usually employed for single-phase power
82 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 46, NO. 1, FEBRUARY 1999 A New ZVS Semiresonant High Power Factor Rectifier with Reduced Conduction Losses Alexandre Ferrari de Souza, Member, IEEE,
More informationConventional Single-Switch Forward Converter Design
Maxim > Design Support > Technical Documents > Application Notes > Amplifier and Comparator Circuits > APP 3983 Maxim > Design Support > Technical Documents > Application Notes > Power-Supply Circuits
More informationA Lossless Clamp Circuit for Tapped-Inductor Buck Converters*
A Lossless Clamp Circuit for Tapped-Inductor Buck nverters* Kaiwei Yao, Jia Wei and Fred C. Lee Center for Power Electronics Systems The Bradley Department of Electrical and mputer Engineering Virginia
More informationZero voltage switching active clamp buck-boost stage Cuk converter
Zero voltage switching active clamp buck-boost stage Cuk converter B.R. Lin and C.L. Huang Abstract: The paper presents an active clamp buck-boost stage Cuk converter to achieve soft switching commutation.
More informationSimplified Analysis and Design of Seriesresonant LLC Half-bridge Converters
Simplified Analysis and Design of Seriesresonant LLC Half-bridge Converters MLD GROUP INDUSTRIAL & POWER CONVERSION DIVISION Off-line SMPS BU Application Lab Presentation Outline LLC series-resonant Half-bridge:
More informationVoltage Fed DC-DC Converters with Voltage Doubler
Chapter 3 Voltage Fed DC-DC Converters with Voltage Doubler 3.1 INTRODUCTION The primary objective of the research pursuit is to propose and implement a suitable topology for fuel cell application. The
More informationGaN in Practical Applications
in Practical Applications 1 CCM Totem Pole PFC 2 PFC: applications and topology Typical AC/DC PSU 85-265 V AC 400V DC for industrial, medical, PFC LLC 12, 24, 48V DC telecomm and server applications. PFC
More informationHigh Frequency Soft Switching Of PWM Boost Converter Using Auxiliary Resonant Circuit
RESEARCH ARTICLE OPEN ACCESS High Frequency Soft Switching Of PWM Boost Converter Using Auxiliary Resonant Circuit C. P. Sai Kiran*, M. Vishnu Vardhan** * M-Tech (PE&ED) Student, Department of EEE, SVCET,
More informationSINGLE STAGE SINGLE SWITCH AC-DC STEP DOWN CONVERTER WITHOUT TRANSFORMER
SINGLE STAGE SINGLE SWITCH AC-DC STEP DOWN CONVERTER WITHOUT TRANSFORMER K. Umar Farook 1, P.Karpagavalli 2, 1 PG Student, 2 Assistant Professor, Department of Electrical and Electronics Engineering, Government
More informationDesign and analysis of ZVZCS converter with active clamping
Design and analysis of ZVZCS converter with active clamping Mr.J.Sivavara Prasad 1 Dr.Ch.Sai babu 2 Dr.Y.P.Obelesh 3 1. Mr. J.Sivavara Prasad, Asso. Professor in Dept. of EEE, Aditya College of Engg.,
More informationPositive to Negative Buck-Boost Converter Using LM267X SIMPLE SWITCHER Regulators
Positive to Negative Buck-Boost Converter Using LM267X SIMPLE SWITCHER Regulators Abstract The 3rd generation Simple Switcher LM267X series of regulators are monolithic integrated circuits with an internal
More informationA NEW SINGLE STAGE THREE LEVEL ISOLATED PFC CONVERTER FOR LOW POWER APPLICATIONS
A NEW SINGLE STAGE THREE LEVEL ISOLATED PFC CONVERTER FOR LOW POWER APPLICATIONS S.R.Venupriya 1, Nithyananthan.K 2, Ranjidharan.G 3, Santhosh.M 4,Sathiyadevan.A 5 1 Assistant professor, 2,3,4,5 Students
More informationFig.1 Block diagram of Multistage HB-LED driver
Design and Simulation of an Efficient LED Driver for Street Light Application D. Gowtami (Assistant Professor) 1, S.Madhuri 2, G.Krushna Shanthi 3, B.Aparna 4,P.Keerthana 5 # Electrical and Electronics
More informationLinear Peak Current Mode Controlled Non-inverting Buck-Boost Power-Factor-Correction Converter
Linear Peak Current Mode Controlled Non-inverting Buck-Boost Power-Factor-Correction Converter Mr.S.Naganjaneyulu M-Tech Student Scholar Department of Electrical & Electronics Engineering, VRS&YRN College
More informationAn Extensive Input Voltage and Fixed-Frequency Single Stage Series- Parallel LLC Resonant Converter for Dc Drive
Vol., Issue.5, Sep-Oct. 0 pp-3693-3698 ISSN: 49-6645 An Extensive Input Voltage and Fixed-Frequency Single Stage Series- Parallel LLC Resonant Converter for Dc Drive P.Ganesh, T.Manokaran,.Department of
More informationNarasimharaju. Balaraju *1, B.Venkateswarlu *2
Narasimharaju.Balaraju*, et al, [IJRSAE]TM Volume 2, Issue 8, pp:, OCTOBER 2014. A New Design and Development of Step-Down Transformerless Single Stage Single Switch AC/DC Converter Narasimharaju. Balaraju
More informationZCS-PWM Converter for Reducing Switching Losses
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-issn: 2278-1676,p-ISSN: 2320-3331, Volume 9, Issue 1 Ver. III (Jan. 2014), PP 29-35 ZCS-PWM Converter for Reducing Switching Losses
More informationComparison and Simulation of Full Bridge and LCL-T Buck DC-DC Converter Systems
Comparison and Simulation of Full Bridge and LCL-T Buck DC-DC Converter Systems A Mallikarjuna Prasad 1, B Gururaj 2 & S Sivanagaraju 3 1&2 SJCET, Yemmiganur, Kurnool, India 3 JNTU Kakinada, Kakinada,
More informationProceedings of the 7th WSEAS International Conference on CIRCUITS, SYSTEMS, ELECTRONICS, CONTROL and SIGNAL PROCESSING (CSECS'08)
Multistage High Power Factor Rectifier with passive lossless current sharing JOSE A. VILLAREJO, ESTHER DE JODAR, FULGENCIO SOTO, JACINTO JIMENEZ Department of Electronic Technology Polytechnic University
More informationAN IMPROVED ZERO-VOLTAGE-TRANSITION INTERLEAVED BOOST CONVERTER WITH HIGH POWER FACTOR
AN IMPROVED ZERO-VOLTAGE-TRANSITION INTERLEAVED BOOST CONVERTER WITH HIGH POWER FACTOR Naci GENC 1, Ires ISKENDER 1 1 Gazi University, Faculty of Engineering and Architecture, Department of Electrical
More informationSingle switch three-phase ac to dc converter with reduced voltage stress and current total harmonic distortion
Published in IET Power Electronics Received on 18th May 2013 Revised on 11th September 2013 Accepted on 17th October 2013 ISSN 1755-4535 Single switch three-phase ac to dc converter with reduced voltage
More informationDC-DC Resonant converters with APWM control
IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) ISSN: 2278-1676 Volume 2, Issue 5 (Sep-Oct. 2012), PP 43-49 DC-DC Resonant converters with APWM control Preeta John 1 Electronics Department,
More informationA New Concept of Power Quality Monitoring
A New Concept of Power Quality Monitoring Victor Anunciada 1, Hugo Ribeiro 2 1 Instituto de Telecomunicações, Instituto Superior Técnico, Lisboa, Portugal, avaa@lx.it.pt 2 Instituto de Telecomunicações,
More informationA Novel Bridgeless Single-Stage Half-Bridge AC/DC Converter
A Novel Bridgeless Single-Stage Half-Bridge AC/DC Converter Woo-Young Choi 1, Wen-Song Yu, and Jih-Sheng (Jason) Lai Virginia Polytechnic Institute and State University Future Energy Electronics Center
More informationTHE classical solution of ac dc rectification using a fullwave
630 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 44, NO. 5, OCTOBER 1997 The Discontinuous Conduction Mode Sepic and Ćuk Power Factor Preregulators: Analysis and Design Domingos Sávio Lyrio Simonetti,
More informationEvaluation of Two-Stage Soft-Switched Flyback Micro-inverter for Photovoltaic Applications
Evaluation of Two-Stage Soft-Switched Flyback Micro-inverter for Photovoltaic Applications Sinan Zengin and Mutlu Boztepe Ege University, Electrical and Electronics Engineering Department, Izmir, Turkey
More informationACTIVE POWER ELECTRONIC TRANSFORMER A STANDARD BUILDING BLOCK FOR SMART GRID
INTERNATIONAL JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY (IJEET) Proceedings of the International Conference on Emerging Trends in Engineering and Management (ICETEM14) ISSN 0976 6545(Print) ISSN 0976
More informationA ZCS-PWM Full-Bridge Boost Converter for Fuel-Cell Applications
A ZCS-PWM Full-Bridge Boost Converter for Fuel-Cell Applications Ahmad Mousavi, Pritam Das and Gerry Moschopoulos University of Western Ontario Department of Electrical and Computer Engineering Thompson
More information6.334 Final Project Buck Converter
Nathan Monroe monroe@mit.edu 4/6/13 6.334 Final Project Buck Converter Design Input Filter Filter Capacitor - 40µF x 0µF Capstick CS6 film capacitors in parallel Filter Inductor - 10.08µH RM10/I-3F3-A630
More informationA Study on the Effect of Load Variation on Quality Factor for Single-Phase Half- Bridge Resonant Converter
A Study on the Effect of Load Variation on Quality Factor for Single-Phase Half- Bridge Resonant Converter R. Baharom, M.F. Omar, N. Wahab, M.K.M Salleh and M.N. Seroji Faculty of Electrical Engineering
More informationPOWERED electronic equipment with high-frequency inverters
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II: EXPRESS BRIEFS, VOL. 53, NO. 2, FEBRUARY 2006 115 A Novel Single-Stage Power-Factor-Correction Circuit With High-Frequency Resonant Energy Tank for DC-Link
More informationIT is well known that the boost converter topology is highly
320 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 2, MARCH 2006 Analysis and Design of a Low-Stress Buck-Boost Converter in Universal-Input PFC Applications Jingquan Chen, Member, IEEE, Dragan Maksimović,
More informationHalf bridge converter with LCL filter for battery charging application using DC-DC converter topology
Half bridge converter with LCL filter for battery charging application using DC-DC converter topology Manasa.B 1, Kalpana S 2 Assistant Professor Department of Electrical and Electronics PESITM, Shivamogga
More informationMethods for Realizing Power Balance in an Interleaved Configuration of LLC Resonant Converters. Heiko Figge, , IBM Technology Symposium
Methods for Realizing Power Balance in an Interleaved Configuration of LLC Resonant Converters Heiko Figge, 13.10.2012, Outline Why going for LLC? Why going for interleaved LLC? The balancing issue of
More informationPower supplies are one of the last holdouts of true. The Purpose of Loop Gain DESIGNER SERIES
DESIGNER SERIES Power supplies are one of the last holdouts of true analog feedback in electronics. For various reasons, including cost, noise, protection, and speed, they have remained this way in the
More informationNovel Soft-Switching DC DC Converter with Full ZVS-Range and Reduced Filter Requirement Part I: Regulated-Output Applications
184 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 16, NO. 2, MARCH 2001 Novel Soft-Switching DC DC Converter with Full ZVS-Range and Reduced Filter Requirement Part I: Regulated-Output Applications Rajapandian
More informationBehavioral Analysis of Three stage Interleaved Synchronous DC-DC Converter for VRM Applications
Behavioral Analysis of Three stage Interleaved Synchronous DC-DC Converter for VRM Applications Basavaraj V. Madiggond#1, H.N.Nagaraja*2 #M.E, Dept. of Electrical and Electronics Engineering, Jain College
More informationSimulation and Performance Evaluation of Closed Loop Pi and Pid Controlled Sepic Converter Systems
Simulation and Performance Evaluation of Closed Loop Pi and Pid Controlled Sepic Converter Systems Simulation and Performance Evaluation of Closed Loop Pi and Pid Controlled Sepic Converter Systems T.
More informationGaN Power ICs at 1 MHz+: Topologies, Technologies and Performance
GaN Power ICs at 1 MHz+: Topologies, Technologies and Performance PSMA Industry Session, Semiconductors Dan Kinzer, CTO/COO dan.kinzer@navitassemi.com March 2017 Power Electronics: Speed & Efficiency are
More informationMODELING AND SIMULATION OF LLC RESONANT CONVERTER FOR PHOTOVOLTAIC SYSTEMS
MODELING AND SIMULATION OF LLC RESONANT CONVERTER FOR PHOTOVOLTAIC SYSTEMS Shivaraja L M.Tech (Energy Systems Engineering) NMAM Institute of Technology Nitte, Udupi-574110 Shivaraj.mvjce@gmail.com ABSTRACT
More informationA Novel Single Phase Soft Switched PFC Converter
J Electr Eng Technol Vol. 9, No. 5: 1592-1601, 2014 http://dx.doi.org/10.5370/jeet.2014.9.5.1592 ISSN(Print) 1975-0102 ISSN(Online) 2093-7423 A Novel Single Phase Soft Switched PFC Converter Nihan ALTINTAŞ
More informationPublished by: PIONEER RESEARCH & DEVELOPMENT GROUP(www.prdg.org)
A High Power Density Single Phase Pwm Rectifier with Active Ripple Energy Storage A. Guruvendrakumar 1 and Y. Chiranjeevi 2 1 Student (Power Electronics), EEE Department, Sathyabama University, Chennai,
More informationIEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 27, NO. 11, NOVEMBER
IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 27, NO. 11, NOVEMBER 2012 4391 A Novel DC-Side Zero-Voltage Switching (ZVS) Three-Phase Boost PWM Rectifier Controlled by an Improved SVM Method Zhiyuan Ma,
More informationZVT Buck Converter with Synchronous Rectifier
IJSTE - International Journal of Science Technology & Engineering Volume 3 Issue 8 February 217 ISSN (online): 2349-784X ZVT Buck Converter with Synchronous Rectifier Preenu Paul Assistant Professor Department
More informationTYPICALLY, a two-stage microinverter includes (a) the
3688 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 33, NO. 5, MAY 2018 Letters Reconfigurable LLC Topology With Squeezed Frequency Span for High-Voltage Bus-Based Photovoltaic Systems Ming Shang, Haoyu
More informationTesting Power Sources for Stability
Keywords Venable, frequency response analyzer, oscillator, power source, stability testing, feedback loop, error amplifier compensation, impedance, output voltage, transfer function, gain crossover, bode
More informationSoft-Switching Active-Clamp Flyback Microinverter for PV Applications
Soft-Switching Active-Clamp Flyback Microinverter for PV Applications Rasedul Hasan, Saad Mekhilef, Mutsuo Nakaoka Power Electronics and Renewable Energy Research Laboratory (PEARL), Faculty of Engineering,
More informationA Novel Single-Switch High Conversion Ratio DC--DC Converter
A Novel Single-Switch High Conversion Ratio DC--DC Converter Ching-Shan Leu and Shun-Yuan Wu Power Conversion Laboratory Department of Electrical Engineering National Taiwan University of Science and Technology
More informationVIENNA Rectifier & Beyond...
VIENNA Rectifier & Beyond... Johann W. Kolar et al. Swiss Federal Institute of Technology (ETH) Zurich Power Electronic Systems Laboratory www.pes.ee.ethz.ch VIENNA Rectifier & Beyond... J. W. Kolar, L.
More informationIN recent years, the development of high power isolated bidirectional
IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 2, MARCH 2008 813 A ZVS Bidirectional DC DC Converter With Phase-Shift Plus PWM Control Scheme Huafeng Xiao and Shaojun Xie, Member, IEEE Abstract The
More informationMODERN switching power converters require many features
IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 19, NO. 1, JANUARY 2004 87 A Parallel-Connected Single Phase Power Factor Correction Approach With Improved Efficiency Sangsun Kim, Member, IEEE, and Prasad
More informationA Feedback Resonant LED Driver with Capacitive Power Transfer for Lighting Applications
A Feedback Resonant LED Driver with Capacitive Power Transfer for Lighting Applications Shreedhar Mullur 1, B.P. Harish 2 1 PG Scholar, 2 Associate Professor, Department of Electrical Engineering, University
More informationPerformance Evaluation of Bridgeless PFC Boost Rectifiers
Performance Evaluation of Bridgeless PFoost Rectifiers Laszlo Huber, Yungtaek Jang, and Milan M. Jovanović Delta Products Corporation Power Electronics Laboratory P.O. Box 12173 5101 Davis Drive RTP, NC
More information