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4th International Science, Social Science, Engineering and Energy Conference 11th-14th December, 2012, Golden Beach Cha-Am Hotel, Petchburi, Thailand I-SEEC 2012 www.iseec2012.com A Zero-Voltage Switching and Zero-Current Switching PWM DC/DC SEPIC Converter for High Power LED Applications B. Hiransinga,e1, T. Tongleamb,e2, C. Buasric,e3, A. Jangwanitlertd,e4 a,b Department of Electronics Engineering, Faculty of Science and Technology, Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand c Department of Electrical Engineering, Faculty of Engineering, Thonburi University, Bangkok, 10160, Thailand d Department of Electrical Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand e1 [email protected], [email protected], e3 [email protected], [email protected] Abstract This paper presents the design of a zero-voltage switching (ZVS) and zero-current switching (ZCS) PWM SEPIC dc/dc converter for high power LED applications. The proposed circuit using a novel lossless commutation cell for high switching frequency operation. The most important property in this circuit is the ability to regulate output power and voltage by Pulse-Width-Modulation (PWM), with constant operating frequency, without load limitation and without sacrificing the lossless commutation. The proposed circuit consists one main and one auxiliary switch under ZVS and ZCS conditions, respectively. The switching frequency of the power MOSFETs is 100 kHz with Atmel AVR ATmega16 microcontroller for prototype. The simulation results obtained from the PSpice program have confirmed the ZVS and ZCS conditions of the proposed circuit and confirmed the experimental results, with an input voltage range of 9V to 15 V, an output voltage rang of 18V to 22V and an output power rating of up to 22 W. The output voltage and current waveforms also show a good response with the load. Keywords: zero-voltage switching and zero-current switching; SEPIC converter; dc-dc converter; high power LED 1. Introduction It has been of interest the development of dc/dc converters and switching power supply with high efficiency, small size and weight, low cost, high power operation, high frequency, low harmonic and unity power factor In this paper, it is proposed a zero-voltage switching (ZVS) and zero-current switching (ZCS) PWM SEPIC dc/dc converter for high power LED applications which provide non-dissipative switching in high frequency and high efficiency. 2 1.1. Structure of the proposed system The circuit configuration of the proposed system is shown in Figure 1. The system is composed of five main parts namely, AC power source, TRIAC dimmer, AC/DC full bridge rectifier, soft switching PWM SEPIC dc/dc converter and high power LED load. L D1 D3 C1 Ls AC Sm TRIAC C D4 R TRIAC DIMMER C Dm Cr V Do Lr Da Lm o Co LED Sa D2 Vgsm Vgsa Auxiliary Circuit BRIDGE RECTIFIER PWM AVR ATmega16 Microcontroller Vref Fig. 1. A zero-voltage switching (ZVS) and zero-current switching (ZCS) PWM SEPIC dc-dc converter for high power LED applications 1.2. Soft Switching SEPIC dc/dc converter The soft switching PWM SEPIC dc/dc converter is shown in Figure 2. In this circuit in shown in Figure 2. (a) consist of a constant DC voltage source, SEPIC dc/dc converter with hard switching, auxiliary circuit for soft switching and a load. Figure 2. (b) show the theoretical wave form Vg,Sa L Vin C Sm Dm Cr Do Lr Da Lm Sa Co RL Vo Vg,Sm t Vcr t t ILr IL+Ism Ism t Auxiliary Circuit t0 (a) t1 t2 t3 t4 t5 t6 t7 t (b) Fig. 2. (a) A zero-voltage switching (ZVS) and zero-current switching (ZCS) PWM SEPIC dc-dc converter ; (b) Theoretical waveforms In this converter the auxiliary switch Sa of the feedback resonant circuit is closed in the ZCS form to provide the soft switching condition from the main switch Sm which responsible by PWM characteristics. Author name / Procedia Engineering 00 (2011) 000–000 2. Simulation Results The proposed circuit simulation with PSpice program. Figure 3(a) show voltage and current waveform at switch and Figure 3 (b) show output voltage at full load (a) (b) Fig. 3.simulation (a) voltage and current waveform at switch Sm (b) output voltage at full load 3. Experimental Results The experiment prototype of the proposed circuit is shown in Figure 4. It is waveform of Pulse Width Modulation (PWM) signal with Atmel AVR ATmega16 microcontroller switching frequency 100 kHz 49% duty cycle Fig. 4. PWM signal Atmel AVR ATmega16 microcontroller 4. Conclusions This paper presents the design of a zero-voltage switching (ZVS) and zero-current switching (ZCS) PWM SEPIC dc/dc converter for high power LED applications. The proposed circuit using a novel lossless commutation cell for high switching frequency operation. The most important property in this circuit is the ability to regulate output power and voltage by Pulse-Width-Modulation (PWM), with constant operating frequency, without load limitation and without sacrificing the lossless commutation. The proposed circuit consists one main and one auxiliary switch under ZVS and ZCS conditions, respectively. The switching frequency of the power MOSFETs is 100 kHz with Atmel AVR ATmega16 microcontroller for prototype. The simulation results obtained from the PSpice program have confirmed the ZVS and ZCS conditions of the proposed circuit and confirmed the experimental results, with an input voltage range of 9V to 15 V, an output voltage rang of 18V to 22V and an output power rating of up to 22 W. The output voltage and current waveforms also show a good response with the load. 3