Automotive 40-V to 1-kV input flyback reference design supporting regenerative braking test
Description
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 60WRegulated 15V with active start-up circuit for reduced standby powerExtendable to higher voltage and higher power range to utilize high voltage capability of SiC MOSFETTwo converter variants with PSR and optocoupler feedback included on boardConstant switching frequency type of controller with maximum switching frequency of 1MHz and duty cycle range from 0% to 96%
Applications
- Fuel cell control unit (FCCU)
- Traction inverter-high voltage
- 1-phase AC-digital control
- 3-phase AC-analog control
- 1-phase AC-analog control
- 3-phase AC-digital control
- OBC-wireless charging
- Auxiliary-power supplies
- Unidirectional 400 V & 800 V to LV
- Unidirectional HV-to-LV digital loop
- Bidirectional 400-V & 800-V to LV
Product Categories
- Power management