Zero-voltage Switching Buck Converter Research Articles

Improved active clamped ZVS buck converter with freewheeling current transfer circuit

An improved active clamped zero-voltage switching (ZVS) buck converter with freewheeling current transfer circuit is proposed in this study. Comparing with the traditional active clamped ZVS buck converter, the current of freewheeling diode, the clamping voltage and duty cycle loss are all halved. The reduced current and voltage stress will result in high reliability and efficiency. Moreover, the reduced duty cycle loss will result in a low input voltage. In the improved converter, a small inductor and an auxiliary diode are added to build the freewheeling current transfer circuit. The operating principle of the improved converter is described. The analysis and design considerations of the proposed converter are given. A 1.2 kW prototype converter is set up to validate the improved converter.

A ZVS Buck Converter Linked with a Buck-Boost Component.

The development of zero-voltage switching (ZVS) technique has attracted for many industrial applications. In this paper, a quasi resonant ZVS buck converter linked with a buck-boost component is presented. The proposed system has the following features. (1) The large peak current does not flow into the semiconductor switches and the reactors. (2) When a storage battery is used as the power supply, a solar battery can be connected with buck-boost component in order to charge the storage battery. Therefore, this system is very suitable for high power and high efficiency DC to DC converter system.