This reference design presents a traction inverter single-phase power stage with three 12-V car battery inputs: 4.2-W bias supply solutions for hybrid electric vehicle and electric vehicle (HEV/EV) systems. All bias-supply solutions accept a wide input range of 4.5 V to 42 V DC from a 12-V car battery: and generate outputs as +15 V: –8 V or +20 V: –4 V configurable and up to 180-mA output current. The power stage includes the isolated gate drivers with 5.7-kVRMS reinforced isolation and designed in 100-mm × 62-mm form factor fitting on SiC/IGBT half bridge modules. It includes isolated DC bus sensing: isolated temperature sensing: logic shoot-through protection and diagnostic features. Apart from startup: efficiency: load regulation tests under low voltage input: all bias supplies are also connected with power stage and IGBT module for CMTI: double pulse: and short-circuit tests under high voltages.