Design and Implementation of Piezoelectric Transducer Driving System with MPPT and ZVS Features
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1 Volue 02 Issue 05, October 2014 Design and Ipleentation of Piezoelectric Transducer Driving Syste with MPPT and ZVS Features Yu-Kai Chen, Chau-Chung Song and Chih-Ying Chen Departent of Aeronautical Engineering, National Forosa University Hu-Wei, Yunlin 632, Taiwan, R.O.C. E-ail: ykchen {at} nfu.edu.tw ABSTRACT--- This paper presents piezoelectric transducer driving syste with axiu power point tracking (MPPT) and zero voltage switching (ZVS) features. The proposed driver is applied to ultrasonic cleaner and to achieve a good cleaning perforance by varying the resonance frequency of piezoelectric transducer. The resonant frequency of piezoelectric transducer depends on the operating tie, teperature and load. The piezoelectric driving syste which includes half-bridge inverter, series resonant parallel loaded (SRPL) and an EM78P458 icrocontroller. The driving syste is done at a resonant frequency at which the electric ipedance is iniu and the phase shift between the voltage and current of the transducer is nearly zero. For switching frequency f s > resonance frequency f r, the phase shift >0, the resonant tank represents an inductive load, thus the switches can be operated in ZVS. The easured results of the syste are shown to verify the MPPT and ZVS features of the proposed syste. Keywords--- piezoelectric resonant tank MPPT 1. INTRODUCTION Ultrasonic cleaner uses ultrasound traveling through liquid to reove containants and deposits fro aterial surfaces, holes, and cracks. Usually, piezoelectric transducer (PZT) is adopted as the vibration sources for the ultrasonic cleaner. The electrical perforance of the piezoelectric transducer is depended on several factors e.g. echanical load, teperature and deposits of polyer on the transducers [1]-[3]. A lot of inverter topologies and control ethods for the PZT driving systes are found in the literature [4]-[10]. This paper presents a piezoelectric transducer driving syste with axiu power point tracking (MPPT) and zero voltage switching (ZVS) features. The proposed driver is applied to ultrasonic cleaner and to achieve axiu cleaning perforance by varying the resonant frequency of piezoelectric transducer. 2. SYSTEM CONFIGURATION AND DESIGN PROCEDURE The piezoelectric driving syste which includes half-bridge inverter, series resonant parallel loaded (SRPL) and an EM78P458 icro-controller. The control block diagra of the proposed ultrasonic cleaner syste is shown in Fig. 1. To achieve the MPPT and ZVS features, the phases of the voltage and current of the piezoelectric transducer are sensed to deterine the switching frequency of the half-bridge series resonant parallel loaded inverter (SRPLI). Fig. 2 shows the circuit of the SRPLI. At the resonance frequency f r and anti-resonance frequency f a of the transducer, the ipedance presented by the load is resistive. When the syste frequency is between resonance frequency f r and anti-resonance frequency f a, it is inductive. Otherwise, the transducer is presented in capacitive. Resonance frequency f r and anti-resonance frequency f a are represented in equations (1) and (2). f r 1 (1) 2 L C f a 2 1 LCCb ( C C ) b (2) Asian Online Journals ( 460
2 Volue 02 Issue 05, October 2014 AC rectifier half-bridge resonant (SRPL) piezoelectric transducer MPPT EM78P458 voltage and current phase detector Fig. 1. The control block diagra of an ultrasonic cleaner syste. Half-bridge SRPL S1 Vin Cn Lr Cr S2 ZP Fig. 2. Half-bridge SRPLI driving circuit for an ultrasonic cleaner syste. The driving syste is done at a resonant frequency at which the electric ipedance is iniu, and the phase shift between the voltage and current of the transducer is nearly zero. The resonance frequency of piezoelectric transducer depends on its tie, teperature and load. The piezoelectric driving syste which includes half-bridge inverter, SRPLI and an EM78P458 icro-controller. The design criterions and procedure of the proposed syste are listed as follows: 1. The transducer all operates at resonance frequency for the best clean perforance, 2. The SRPLI all operates in inductive load for zero voltage switching (ZVS) feature. Step 1: Deterine the value of resonance inductor L r and capacitor C r, using (3) V V ZP in 2V I s o 2 s oq 2 (3) where: s switching frequency, o :natural frequency= L 1 r C r = 2 f o, and quality factor Q:= Step 2: R L C. For switching frequency f s > resonant frequency f r, the phase shift >0, the resonant tank represents an inductive load, thus the switches can be operated in ZVS. Thus, we can deterine the switching frequency. The key wavefors of the SRPLI when the syste is operated under inductive load which are shown in Fig. 3. Asian Online Journals ( 461
3 Volue 02 Issue 05, October 2014 Fig. 3. The key wavefors of the SRPLI under inductive load Step 3: To adjust the switching frequency and let the voltage and current of the transducer is in phase. The axiu power point tracking of the proposed syste can be achieved. Asian Online Journals ( 462
4 Volue 02 Issue 05, October ILLUSTRATION EXAMPLE AND DISCUSSION An ultrasonic cleaner syste with phase control is used to illustrate the previous analysis and design. The equivalent circuit of the transducer is shown in Fig. 4, where the characteristic paraeters are listed in Table I. The siulation and easured ipedance of the transducer is shown in Fig. 5 (a) and (b). Fro the siulated and easured results, we can see that the Cb C. L R Fig. 4. Equivalent circuit of a piezoelectric transducer (a) Fig. 5. Ipedance of a piezoelectric transducer: (a) siulation and (b) easured. The experiental results of the proposed syste are shown in Figs Fig. 6(a) shows the easured voltage and current wavefors of the driving syste are not in phase without the MPPT control algorith. With the MPPT control algorith, we can see that the easured voltage and current wavefors are in phase and shown in Fig. 6(b). Fig. 7 shows the easured voltage V DS and current I DS wavefors of the switch of SRPLI, the ZVS feature is achieved. Fig. 8 shows the easured oscillation wavefors of the piezoelectric transducer for an ultrasonic cleaner. The easured results of the syste are shown to verify the MPPT and ZVS features of the proposed syste. Table I. Characteristic paraeters of a piezoelectric transducer paraeters L (b) value 7.01 H C 1.79 nf R 1.65 C b 5.27 nf Q f r khz f khz a Asian Online Journals ( 463
5 Volue 02 Issue 05, October 2014 V ZP I ZP (V ZP :50V/div I ZP :0.5A/div tie:20us/div) (a) V ZP I ZP (V ZP :50V/div I ZP :0.5A/div tie:20us/div) (b) Fig. 6. Measured voltage V ZP and current I ZP wavefors of the piezoelectric transducer: (a) without MPPT and (b) with MPPT I DS V DS (V DS :50V/div I DS :0.5A/div tie:20us/div) Fig. 7. Measured voltage V DS and current I DS wavefors of the switches Asian Online Journals ( 464
6 Volue 02 Issue 05, October 2014 (V:2V/div tie:10us/div) Fig. 8. Measured oscillation wavefors of the transducer for an ultrasonic cleaner 4. CONCLUSION This paper proposed a MPPT and ZVS features with a low-cost icro-controller for an ultrasonic cleaner. The design procedure of the proposed piezoelectric transducer syste has been outlined in this paper. The prototype of such a piezoelectric transducer syste for a 45W ultrasonic cleaner has been designed and ipleented. The siulated and easured results of the syste are shown to verify the MPPT and ZVS features of the proposed syste. 5. ACKNOWLEDGEMENT This work was supported by the National Science Council, Taiwan, R.O.C., under Projects NSC E and NSC E REFERENCES [1] k. Aqbossou, J.-L. Dion, S. Carignan, M. Abdelkri and A. Cheriti, Class D aplifier for a power piezoelectric load, IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, vol. 47, July 2000, pp [2] S. S. Muhlen, Design of an optiized high-power ultrasonic transducer, IEEE Trans. on Ultrasonics Syposiu, vol.3, Dec 1990, pp [3] J. I. lshikawa, T. Sato, T. Suzuki, H. lkeda, H. Yoshida and S. Shinohara, New type of copact control syste for frequency and power in egasonic transducer drive at 1 MHz, in Proc. Industry Applications Conference, vol. 3, Oct 1998, pp [4] D. Capolo, M. Sitti and R. S. Fearing, Efficient charge recovery ethod for driving piezoelectric actuators with quasi-square waves, IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, vol. 50, March 2003, pp [5] P. Fabijanski and R. Lagoda, Series resonant converter with sandwich-type piezoelectric ceraic transducers in Proc. ICIT 96, pp [6] C. Kauczor, and N. Frohleke, lnverter topologies for Ultrasonic Piezoelectric Transducers with Hihg Mechanical Q-Factor in Proc. PESC 04, pp [7] G. Ivensky, I. Zafrany, and S. Ben-Yaakov, Generic operational characterisitics of piezoelectric transforers, in Proc. PESC 00, vol. 3, pp [8] H.-L Cheng, C.-A. Cheng, C.-C. Fang, and H.-C. Yen, Single-Switch High-Power-Factor Inverter Driving Piezoelectric Ceraic Transducer for Ultrasonic cleaner, IEEE Trans. on Power Electronics, vol. 58, July 2011, pp [9] G. Winter, c. Auvigne and Y. Perriard, Design of a Resonant Power Inverter for a Piezoelectric Actuator, in Proc. IECON 2012, pp [10] R. A. Pentz, J. Wheeler, G. D. Jager, and R. H. Wilkinson, Driving an Ultrasonic Transducer with a Multicell Inverter, in Proc. ECCE-Asia 2013, pp Asian Online Journals ( 465
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