Study of Three-level ANPC Soft-switching Converter Based on Asynchronous Parallel Connection of Devices
A three-level active neutral point clamped(3L-ANPC)zero-voltage soft-switching converter topology based on asynchronous shunt devices is proposed,wherein the outer and clamp-side switching devices operate at the indus-trial frequency.The inner high-frequency switching devices are arranged in parallel and connected to two differential-mode inductors,respectively.During heavy load conditions,both devices operate synchronously to jointly carry the load current.In light load conditions,asynchronous timing control is utilized to generate rectangular circulating currents be-tween the differential-mode inductors,which resonates with the device's parasitic capacitance,creating a zero voltage switching(ZVS)condition for the high-frequency devices,thereby reducing switching losses and stress.The topology structure and the soft-switching commutation process of the converter is presented,the control timing for the asyn-chronous parallel devices is outlined,and the design method for the differential-mode inductors is described.The pro-posed soft-switching topology's capability to effectively enhance converter efficiency under light load conditions is then verified through a 10 kW single-phase experimental platform.
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