Cascaded operation power semiconductor device voltage balancing device and method thereof

The invention discloses a cascaded operation power semiconductor device voltage balancing device and method and belongs to the technical field of power electronic conversion. The power semiconductor switch comprises N cascaded power semiconductor devices, N turn-off voltage sampling units, a voltage equalization calculation unit and N switching signal phase compensation units and is suitable for voltage equalization under cascaded operation of the power semiconductor devices, and expanding a working voltage of the power semiconductor switch. The power semiconductor switch is advantaged in thatswitching signal compensation phases are generated by detecting a voltage at two ends of the cascade devices and added to driving signals, and voltage distribution of the cascade device is actively adjusted. The invention provides a switching signal phase difference generation method and a corresponding support parameter test method, which are used for ensuring stable and high-speed operation ofa control loop.