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AN IMPROVED ZVT–ZCT PWM DC–DC BOOST CONVERTER WITH INCREASED EFFCIENCY

AN IMPROVED ZVT–ZCT PWM DC–DC BOOST CONVERTER WITH INCREASED EFFCIENCY

ABSTRACT:

          A new active snubber cell is proposed for a dc–dc boost converter. Zero voltage transition (ZVT) turn on and zero current transition (ZCT) turn off are provided by this active snubber cell. There is no extra current or voltage stresses on the main switch. Also, zero current switching (ZCS) turn on and ZCT turn off are provided for the auxiliary switch. Although there is no extra voltage stress on the auxiliary switch, a current stress is present. However, auxiliary switch current stress is decreased by coupling inductance. The coupling inductance transfers the part of the current stress to the output load according to the transform ratio.

In this project, the ZVT–ZCT PWM dc–dc boost converter’s steady- state analysis is proposed for one switching cycle.

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