Parameters Design of Series Resonant Inverter Circuit

Transcription

1 Available online at Phyic Proceia 4 (0) nternational Conerence on Applie Phyic an nutrial Engineering Parameter Deign o Serie Reonant nverter Circuit Xingkun Qi, Yonglong Peng, Yabin Li Dept. o Electric Power Engineering, North China Electric Power Univerity, Baoing, China Abtract Thi paper analyze the main circuit tructure o erie reonant inverter, an eign the component parameter o the main circuit.that provie a theoretical metho or the eign o erie reonant inverter. 0 Publihe by Elevier B.V. Selection an/or peer-review uner reponibility o CAPE Organization Committee. 0 Publihe by Elevier Lt. Selection an/or peer-review uner reponibility o [name Open acce uner CC BY-NC-ND licene. organizer] Keywor: inverter erie; the main circuit parameter; inuction heating power upply. ntrouction Reonant inverter i a key component o oli tate inuction heating power upply. t evelopment level ha cloely relate with the evelopment an application o inuction heating power upply an inuction heating technology. The block iagram o oli tate inuction heating power upply i hown in Figure : Figure. Block iagram o oli tate inuction heating power upply There are two main orm o reonant inverter: voltage ource type erie reonant inverter an current ource parallel reonant inverter, the itinction o inuction heating power i rom the point o the inverter they ue. GBT parameterrc nubber circuit an it relate parameter o erie reonant inverter are mainly calculate an eigne in thi paper Publihe by Elevier B.V. Selection an/or peer-review uner reponibility o CAPE Organization Committee. Open acce uner CC BY-NC-ND licene. oi:0.06/j.phpro.0.0.0

2 34 Xingkun Qi et al. / Phyic Proceia 4 (0) The Operation Principle o Serie Reonant nverter Main circuit topology o erie reonant inverter i hown in Figure. Figure. Schematic o erie reonant inverter Serie reonant inverter generally work in the emotional tate o quai-reonant, which nee to et the ea time when inverter convert. The output voltage i a rectangular wave, output current i inuoial, an the loa requency i the erie reonant characteritic, o it houl not be no-loa. 3. Parameter Deign o gbt The reliability o inuction heating power upply epen on the propertie o component, o how to chooe component i very important. Mot o the GBT moule work uner the DC bu voltage, o the general GBT voltage (600V, 00V, 700V) correpon to the common power gri voltage. Thereore, roughly electing the voltage accoring to network voltage U N (i it i controlle rectiier brige, the control angle i 0) or the ieal no-loa DC voltage U i i the irt tep o the election. An then the imum allowable voltage o the moule in the cae o the imum voltage appearing i checke whether exceee or not, i.e. The gri rate voltage plu the luctuation prea i tatic input voltage a imum, or example, 5% [] The gri ynamic over-voltage i the voltage that i not aborbe by the aborption circuit o power ilter, the DC bu capacitor or DC voltage. Turn-o over Voltage U U which U L / t Where L i the paraitic inuctance o converter circuit; i the imum poible current collector or turn-o current; t i the all time o collector or the gate current. n practical application proce, i the loa impeance varie greatly, loop voltage, current i large, an it volatility i very intene, thereore when GBT i electe, the ollowing two apect houl be note: a) Preure iet mut be able to withtan the imum no-loa voltage o power upply, taking into account the tranient pike o gri voltage, voltage pike caue by voltage luctuation, witching current an other ie eect, an have ome margin, o the preure value o GBT we chooe houl be about more than ouble the peak voltage ae to both en at the teay-tate [] b) Rate currentt mut be able to withtan the imum rate current o the power, at the ame time the GBT collector peak current mut be within the ae operating area o GBT witch, an can withtan overloa to a certain extent, o the electe rate current o GBT houl be about.5 time o the imum current value.

3 Xingkun Qi et al. / Phyic Proceia 4 (0) Element Parameter Deign o Rc Snubber Circuit A other power emiconuctor evice GBT ha lower overloa capacitie, RC nubber circuit i neee in orer to inhibit o the tranient overvoltage generate in the proce o witching. RC nubber circuit in parallel at both en o GBT ha the role o the ollowing apect: inhibiting o over-voltage, reucing witching loelimiting the rate o the voltage rie, eliating the electromagnetic intererence an o on. Buer circuit o reonant inverter ha variou orm, an the ummarize ive connection are hown in Figure 3: Figure 3. Five kin o buer circuit The buer circuit in Figure 3a i the mot imple circuit, when GBT work, capacitor C at both en o the DC bu which i cro-connecte cloe to GBT can aborb the energy at both en o L, o that the emitter GBT et inhibition on tranient voltage pike between collector pole an emitter pole o GBT can be inhibite, thi metho i uitable or protecting evice uner 50A or ue in conjunction with other protection metho [3]. The circuit howe in Figure 3b i ue or protecting evice uner 00A, the circuit ha a goo eect in inhibiting the tranient voltage when GBT i turne o, inhibition o tranient voltage i le eective when GBT work, an the exitence o R i to eliate ocillation.

4 36 Xingkun Qi et al. / Phyic Proceia 4 (0) Figure 3c an how that it i the mot eective or the buer circuit to inhabit the tranient voltage when GBT i witching, it i alo helpul to reuce the GBT turn-o loe an eliate paraitic ocillation. But when GBT i opening, the icharge o capacitor C will increae opening loe o GBT, epecially in reitor R which ha a large lo, the circuit can be ue in high current, low voltage ytem an the chopper [3]. The circuit in Figure 3e can be ue or protecting evice over 300A, which ha a lower buer element power lo, a goo perormance in reucing the GBT turn-o lo, an avantage o the opening o GBT an no puriou ocillation an o on. Take the thir RC nubber circuit or example, the evice parameter are uually etere with a metho by the combination o calculation an tet, the parameter are preliary ixe a ollow: a) Buer capacitor We can ee rom the law o conervation o energy, the energy aborbe by the buer capacitor C an the energy tore in the lea inuctance L are equal. Thereore L / C ( U U ) / () Co CEP n the equation: L i the lea inuctance, Co i the hutown current. U CEP i the peak voltage between the collector an emitter o GBT, in orer to protect GBT rom amage, which i generally limite to 80% o rate voltage GBT. By Equation (), the equation o calculating the capacitance o the buer i erive: LCo C ( U CEP U ) The voltage unertaken by C i equal to the voltage pike U CEP, generally.5 to time o the voltage reerve houl be coniere. b) Aborption reitance The larger the external capacitor,the more loa current tranerre rom the power tube,i.e.,the more turn-o loe are tranerre rom the power tube,an the working conition o the power tube are improve. To enure the over-voltage o the nubber capacitor icharge beore the GBT i turne o, the aborption reitor R houl be met: R ( ~ 6) C n the inequation, i requency o witching evice. Meanwhile, in orer to prevent the ocillation caue by C icharging, R houl be met: R LC So generally it i calculate by the ollowing equation: LC R ~ 6 C c) The calculation o the parameter o anti-parallel ioe A variety o actor nee to be coniere or the proper eign o anti-parallel ioe. Some o them are relate with their own technology, other are relate with application. The power upply work in near reonant emotional tate, o rom Figure, the output current expreion o the inverter i: 4U in( t ) RL The approximate expreion o average current lowing through the anti-parallel ioe uring

5 Xingkun Qi et al. / Phyic Proceia 4 (0) converter i: D 4U in( t t RL ) Since the opening proce o GBT epen on the revere recovery proce o the anti-parallel ioe, at recovery ioe i generally ue. 5. Deign o Other Parameter 5. Filter nput Capacitance Single-phae 0V/50z power upply i commonly ue by low an meium power a an input, pulating DC voltage U c can be get through the power rectiie D ~ D 4 rectiier brige, the input ilter capacitor C i ue to reuce the pule to get a mooth DC voltage, the election o C ilter capacitor i critical, becaue the ilter capacitance C i too mall, the pule o DC voltage U c will be larger, cauing the output voltage luctuation, while the imum value U c o DC voltage U c i maller, leaing to the witch current increaing [4]. the ilter C i too large, that will lea to input power actor lower, EM increaing, the lo o the input rectiier an ilter capacitor caue by exceive input current (RMS) increae; at the ame time capacitance increae, the cot will alo increae [4]. Generally it bae on empirical algorithm: when the imum input i AC, the pule value U pp o DC voltage ater the rectiier iltering i 0% to 5% o the imum input AC voltage peak value. input AC voltage ranging rom U ~ U, an the requency ranging rom ~ are known, the ollowing tep are ue to calculate the capacity o C : Voltage RMS: U ~ U Peak voltage: U ~ U The imum pule rectiier iltere DC voltage: U pp U (0% ~ 5%) Rectiie iltere DC voltage: U c ( U U pp ) ~ U While input power Pin P out / Where P out i the output power i power converion eiciency; to enure the imum DC voltage to meet the requirement, the energy W in which C can provie each cycle i about Pin Win A The energy provie by input ilter capacitor each hal cycle i: Win C [( U ) ( U U pp ) ] Capacity an imum value o the rectiie DC voltage U are calculate accoring to the equation, the appropriate electrolytic capacitor are electe with the reerence. 5. Reonant Capacitor The output voltage o the inverter i

6 38 Xingkun Qi et al. / Phyic Proceia 4 (0) The output current o the inverter i U ab U U ab P co0 Reonant capacitor an the voltage acro the two en o the enor are Q time o the output voltage. Q i the quality actor o the circuit, which can be empirically electe accoring to the ierent ue o the evice. Generally when it i ue or high-requency quenching, Q take 0 to 0. Thereore, the voltage acro the reonant capacitor i Thereore, the impeance i U C X C U C QU C X C QC X C Thereore, the reonant capacitor mut be electe accoring to the above parameter, the reonant requency can be regulate through exchanging the number o parallel capacitor. Concluion The main circuit o erie reonant inverter i tuie in thi paper, an on thi bai, it parameter were carrie out by theoretical analyi ater analyzing the main tructure, which ha a very important igniicance or the inverter parameter election an optimization eign. Acknowlegment On the occaion o the paper i complete, the author how gratitue or the guiance o my reearch upervior Yonglong Peng an my teacher Yabin Li in the proce o the writing o the paper, an thank or the help o my enior choolellow Yongxing Wang an my enior girl choolellow airun Qi. At lat thank or the Baoing Sanyi TianXing Electric Co., Lt, proviing the goo environment or the writing o the paper. Reerence [] Kexuan Chen, Wang Zhang, Yongpeng Du. Reliability o GBT [J]. Weling, 007(5): 3-6. [] Tiang Pan. Moern inuction heating evice [M]. Beijing: Metallurgical nutry Pre, 996. [3] Yinghui Gao. Reearch on F Technology o GBT Serie Reonant nverter: [Mater' egree thei]. Baoing: North China Electric Power Univerity ntitute o Electrical an Electronic Engineering, 004 [4] Ping Bai. Reearch on Ultra-high Frequency nuction eating Power Supply: [Mater' egree thei]. Sichuan: Sichuan Univeritity, 005. [5] Wei Chen. Reearch on Soli State igh Frequency nuction eating Power Supply: [Mater' egree thei]. Xi an: Xi'an Univerity o Technology, 000. [6] Min YeBinggang Cao. Reearch on Dual GBT Snubber Circuit [J]. Stepper motor network in China, 00, Page():40-43.