SUMMARYThe 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 steady-state analysis and design procedure of the diode-clamped two-switch flyback converter operated in continuous-conduction mode (CCM). The power loss in each component of the two-switch flyback converter is compared with those of the single-switch flyback converters with and without RCD clamp, and is presented in a tabular form. The two-switch flyback converter was bread-boarded to validate the theoretical analysis. Experimental results from a 10 V/30 W, 100 kHz laboratory prototype verified that the maximum switch voltage is limited to the DC input voltage.
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