Dual‐passive snubber dual‐switch forward converter

Abstract

A dual-passive snubber (DPS) for dual-switch forward converter is presented. Snubber networks provide zero-current turn-on and zerovoltage turn-off conditions for dual switches. DPS achieves soft switching conditions for power diodes at secondary side of transformer. The detailed circuit operation of converter with proposed passive snubber, theoretical analysis and design example are presented. The measured result taken from a laboratory prototype rated at 160 W (32 V/5 A), input voltage of 150 V-DC and switching frequency of 300 kHz. The peak efficiency is 93%.

Regenerative‐passive snubber two‐switch forward converter

“…In Fig. 4d, the efficiency of proposed converter is compared with the efficiency of topologies in [1,5] for 20-100% load power. It can be seen that the proposed converter has 95% efficiency at full load and >85% at light loads.…”

“…This ASC has an isolation problem and very complex control circuit. In [5], a double passive snubber (DPS) is proposed. The DPS has achieved fully soft‐switching of PWM‐TSFC and greatly improved efficiency.…”

“…Therefore, it cannot be used for medical applications that need to have low volume and low EMI converters. In [2][3][4][5], some techniques are presented to achieve soft switching conditions for PWM-TSFC.…”