A high-performance ZVS full-bridge DC-DC 0-50-V/0-10-A power supply with phase-shift control

This paper presents a high-performance de-de switching mode power supply designed to deliver a regulated 0-50 V/0-10-A output. The proposed power supply is based on a modified version of the zero-voltage switching (ZVS) full-bridge (FB) phase-shift de-de converter, which incorporates commutation auxiliary inductors to provide ZVS for the entire load range as well as a commutation aid circuit to clamp the output diode voltage. The control strategy is based on two control loops operating in cascade mode, The inner loop maintains a regulated output current, whereas the external voltage loop regulates the output voltage, independently of load and input-voltage changes, In order to obtain a hip;h-reliability converter, the control circuit has been implemented using just two integrated circuits (IC's). The phase-shift regulator UC3875 IC generates the gate drive signal to the MOS:FET's, The control loop regulators are implemented using the TL074 IC, A theoretical analysis was conducted, and experimental results were obtained for a 0-50-V/0-10-A power supply operating at 100 kHz.