The increasing demand for electric and hybrid vehicles has put pressure on manufacturers to develop more efficient and reliable traction inverter systems. One of the key challenges is to ensure that the auxiliary power supply provides stable power under varying fault conditions. This requires auxiliary power supplies that can handle wide input voltage ranges and provide consistent output power, even in harsh environments.
Designed to meet the demanding voltage and reliability requirements of electric, hybrid, and plug-in hybrid electric vehicles (EVs, HEVs, and PHEVs), this turn-key auxiliary power supply solution for traction inverter systems delivers a compact, efficient, and robust solution for high-power traction inverter applications. Built around a high-voltage flyback converter topology, this design features a wide input range of 40V to 1000V and delivers dual outputs of +22V regulated and -6V unregulated with a total power output of 45W. Optimized for 800V battery-based traction inverters, the flyback converter ensures functional safety support for regenerative braking and consistent performance across a wide range of operating conditions.
By leveraging AEC-Q101 qualified 1400V mSiC™ MOSFETs, this solution minimizes switching losses while eliminating the need for a dedicated gate driver, enhancing overall system efficiency and reliability. The automotive-grade transformer ensures reinforced isolation, while the active start-up circuit significantly reduces standby power consumption, making the flyback converter-based design highly efficient and dependable.
Features
- Wide input range: 40V to 1000V
- Dual outputs: +22V regulated (secondary side) output and -6V unregulated output with a total output power of 45W
- Dual output voltage suitable for generating voltage rails for control circuitry and driving power switches
- Optimized for Traction Inverters: Ideal for 800V battery-driven EV, HEV & PHEV power systems
- Supports functional safety needs for regenerative braking from the traction motor
- Utilizes Microchip’s AEC-Q101 qualified 1400V mSiC™ MOSFET, reducing switching losses and eliminating the need for a dedicated gate driver
- Transformer designed to meet AEC-Q200 with reinforced isolation for safety and reliability
- Active start-up circuit for reduced standby power consumption
- Extendable to higher voltage and power levels, leveraging SiC MOSFET’s high-voltage capability
- Discontinuous conduction mode (DCM) with peak-current mode control enhances response time to perturbations and system robustness
- Constant switching frequency controller improves predictability and performance stability
Benefits
- Wide input range: 40V to 1000VLeverages AEC-Q101 qualified 1400V mSiC™ MOSFETs, which minimize switching losses, eliminate the need for a dedicated gate driver, and enhance overall power conversion efficiency.
- Supports a broad input range of 40V to 1000V, making it adaptable for various EV, HEV and PHEV traction inverter architectures while allowing scalability to higher voltages and power levels.
- Features an automotive-grade transformer with reinforced isolation and an active start-up circuit, ensuring robust operation, reduced standby power, and improved safety in high-voltage automotive environments.
Applications
- Electric Vehicles (EVs)
- Hybrid Electric Vehicles (HEVs)
- Plug-in Hybrid Electric Vehicles (PHEVs)
Block diagram
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