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g g S S Design and Simulation of Nonisolated ZVZCS……. in high-component availability and easy thermal distribution. A specification for a design example in this paper is given as follows and the chosen circuit topology for the specifications is shown in Fig.4. Po =220 W, Vo = 105 V, Vi = 12 V, fs= 15 kHz, ∆Iin = 20%, ∆Vo = 3%. Considering input current ripple ∆I in, input inductor L f is determined by, Lf = 0.5(1-D).V in / ∆I in . f s = 70µH. B. Design of f r Due to the smaller switch turn off current and duty loss, the below-resonance operation is chosen, and the resonant frequency f r can be obtained from f r = 1 / 2π√L r C r and f r = 1 /2D eff. So, f r ≤ 42 kHz C. Design of L r and C r From the resonant frequency f r, L r = 3 µH & C r = 4.7 µF. The improvement of the proposed RPWM method compared to PWM method are summarized as follows. 1) Due to the reduced operation duty, the rms current ratings of the switches are reduced by 5-15%, resulting in reduced conduction losses. 2)Due to the resonant operation, the turn-off current of switches are reduced by 25-60% and falling slopes of the diode current are reduced, resulting in significantly reduced switching losses. 3)The required capacitance of auxiliary capacitor is dramatically reduced to 1/20 th resulting in reduced volume and cost. VII. SIMULATION CIRCUIT i + - Discrete, Ts = 5e-006 s powergui Vin + - v Input Current ,Iin Input Voltage double NOT m m D D + - i + - v Diode + Diode 1 - v i + - i + - i + i - + - Input Filter Inductor Auxiliary Capacitor Auxiliary Inductor + - v + - v OFF- SHELF C A P A C I T O R Output Capacitor i + - Output Current ,Iout + - v Output Voltage ,Vout Duty Cycle Fig(a) Input voltage www.<strong>ijcer</strong>online.com ||May ||2013|| Page 6
Design and Simulation of Nonisolated ZVZCS……. Fig(b) Output voltage Fig(c)Duty cycle Fig(d) Input current Fig(e) Output current V. CONCLUSION In this paper, an RPWM method switching method has been proposed for high step-up soft switching dc-dc converter. The proposed converter has the following advantages: The proposed converter has the following advantages: a. ZVS turn-on of the active switches in CCM. b. Negligible diode reverses recovery due to ZCS turn-off of the diodes. c. Greatly reduced passive components and voltage ratings. d. Its voltage gain is 8.75 times, is doubled with the classical boost converter. www.<strong>ijcer</strong>online.com ||May ||2013|| Page 7
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