This power supply reference design for automotive auxiliary circuits generates a 15-V, 4-A output from a wide input range of 40 V to 1 kV and up to a 1.2-kV transient. The design fits ideally into an 800-V batterydriven hybrid-electric vehicle (HEV) or electric vehicle(EV) traction inverter system. The 40-V minimum input voltage supports the functional safety test for the regenerative braking from the traction motor. This reference design implements a silicon carbide (SiC) MOSFET with high blocking voltage and low gate charge to reduce switching losses. A non-isolated level shifter enables driving the SiC MOSFET from the Si MOSFET driver embedded in the flyback controller. The board includes two flyback converter variants: primary-side regulation (PSR) and optocoupler feedback to make comparisons and address different needs. The transformer design meets qualifications for Automotive AEC-Q200 Grade 1 with reinforced isolation.
Features
- 40V to 1kV input, 15-V output flyback auxiliary power supply with output power up to 60W
- Regulated 15V with active start-up circuit for reduced standby power
- Extendable to higher voltage and higher power range to utilize high voltage capability of SiC MOSFET
- Two converter variants with PSR and optocoupler feedback included on board
- Constant switching frequency type of controller with maximum switching frequency of 1MHz and duty cycle range from 0% to 96%