Two-switch flyback PWM DC-DC converter in discontinuous-conduction mode

The two-switch flyback DC–DC converter is an extended version of the conventional single-switch flyback converter. An additional switch and two clamping diodes serve as a simple, but an effective way to limit the switch overvoltages, which occur in the conventional single-switch flyback converter due to the ringing of the resonant circuit formed by the transformer leakage inductance and the transistor output capacitance. The clamping diodes in the two-switch flyback topology clamp the maximum voltage across each switch equal to the DC input voltage. This paper presents a detailed analysis and design procedure of the diode-clamped two-switch flyback converter operated in discontinuous-conduction mode (DCM). A comparison of power losses of the two-switch and the single-switch flyback converters is given. The two-switch flyback converter was bread-boarded to validate the theoretical analysis. Experimental results from a 20-V/30-W, 100-kHz laboratory prototype verified that the maximum switch voltage is limited to the DC input voltage. Copyright © 2010 John Wiley & Sons, Ltd.

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