• DCDC

Phase-Shifted Full Bridge Converter (Diode Rectification)

Description

This circuit has a phase shift between the left and right legs on the primary side and provides power to the secondary side only during the overlapping period. Since the duty of each leg is fixed at close to 50%, zero voltage switching (ZVS) operation is possible, which is suitable for high voltage (400VDC series, etc.) and several kW applications. It is often used for EV OBC and server DC-DC. The inductor at primary side is required for ZVS operation.

Overview

- Zero voltage switching (ZVS)
- Phase shift between both half-bridges for voltage / current control.
- Isolation transformer enables large step-down ratios
- Efficiency around 96%
- Frequency: 100..150 kHz
- SJ MOSFETs with robust & fast body-diode required --> PrestoMOS

Circuit

Circuit

Key Products

Product Category Product family Product Number Feature
Primary Side 750V SiC MOSFET SCT4xxxDx series NEW The latest SiC MOSFET device. Enhanced low on-resistance enable best in class performance. It supports 750 V withstand voltage, ensuring a higher operating margin than conventional products, and can be used safely.
650V SiC MOSFET SCT3xxxAx series Trench-gate SiC MOSFET with low on-resistance (50% reduction) compared to conventional products.
Secondary Side 600V Si FRD RFN series The low Vf type FRD is suitable for rectification, and achieves low loss even at high current.
Gate Driver 3750V voltage tolerance BM61x4xRFV 1ch configuration, 3,750Vrms isolated type Gate Driver, can be used for switching devices with current source pins.

Simulation

C-019: Phase-Shifted Full Bridge Converter (Diode Rectification)

Related Topologies

LLC Converter (Full Bridge, Synchronous FETs)

LLC Converter (Full Bridge, Diode Rectification)

Phase Shifted Full Bridge Converter (Synchronous FETs)