2 Four-Phase Interleaving Phase-Shifted Full Bridge Power Supply Design

In generally, most designer potential to design the power supply to drive superconducting coils with a single PSFB circuit. but potential to meet challenges ahead said. To solve these challenges, this paper proposes a four-phase interleaving phase-shifted full bridge scheme as shown in Figure 2-1. As abstract clarify, this application notes mainly focus on controller system than power electronic topology.

Consider the basic specifications as the following:

• Input voltage: DC48V to DC60V
• Output voltage: 0 to 10V DC
• Output current: up to 500A
• Output current precision: 0.1%
• Output current temperature drift: 10ppm max
• Output current ripple and noise: less than 100mA

The benefit of 4-phase interleaving phase shifted full-bridge scheme is:

• Low-capacity power MOSFET can be used which means relatively easy sourcing of components
• Possibly reduced thermal issues because of lower current rate

Interleaving scheme reduces output buffer capacitor size and capacity because of four times increase in the switching frequency.