Interleaved ZVS DC/DC Converter with Balanced Input Capacitor Voltages for High-voltage Applications

Abstract

A new DC/DC converter with zero voltage switching is proposed for applications with high input voltage and high load current. The proposed converter has two circuit modules that share load current and power rating. Interleaved pulse-width modulation (PWM) is adopted to generate switch control signals. Thus, ripple currents are reduced at the input and output sides. For high-voltage applications, each circuit module includes two half-bridge legs that are connected in series to reduce switch voltage rating to V in /2. These legs are controlled with the use of asymmetric PWM. To reduce the current rating of rectifier diodes and share load current for high-load-current applications, two center-tapped rectifiers are adopted in each circuit module. The primary windings of two transformers are connected in series at the high voltage side to balance output inductor currents. Two series capacitors are adopted at the AC terminals of the two half-bridge legs to balance the two input capacitor voltages. The resonant behavior of the inductance and capacitance at the transition interval enable MOSFETs to be switched on under zero voltage switching. The circuit configuration, system characteristics, and design are discussed in detail. Experiments based on a laboratory prototype are conducted to verify the effectiveness of the proposed converter.

A new interleaved high step‐down converter with wide range of soft switching

“…An interleaved soft-switching buck converter is introduced in Ref. 16. In this converter, an auxiliary circuit is used to create zero-voltage switching (ZVS) conditions for switches.…”

Actively Clamped Two-Switch Flyback Converter with High Efficiency

“…High switching frequency pulse-width modulated DC-DC converters have been widely used for switch-mode power supplies [1]- [8]. Among these converters, the flyback converter is most popularly used because of its simple power circuit structure [9], [10].…”

“…The two switches S 1 and S 2 are turned on and off simultaneously. The two clamping diodes D C1 and D C2 clamp the voltage across S 1 and S 2 by the input voltage V in . The energy stored in the transformer T is recycled to the input side through the clamping diodes D C1 and D C2 [14].…”