The power module in a DC charging station consists of AC/DC power stage and DC/DC power stage. Each converter associated with its power stage comprises of power switches and gate driver, current and voltage sensing, and a real-time micro-controller. On the input side it has three-phase AC mains which are connected to the AC/DC power stage. This block converts the incoming AC voltage into a fixed DC voltage of around 800 V. This voltage serves as input to the DC/DC power stage which processes power and interfaces directly with the battery on the electric vehicle. Each power stage has a separate real-time micro-controller which is responsible for the processing of analog signals and providing fast control action.

The AC/DC stage (also known as the PFC stage) is the first level of power conversion in an EV charging station. It converts the incoming AC power from the grid (380–415 VAC) into a stable DC link voltage of around 800 V. The PFC stage maintains sinusoidal input currents, with typically a THD < 5%, and provides controlled DC output voltage higher than the amplitude of the line-to-line input voltage. The DC/DC stage is the second level of power conversion in an EV charging station. It converts the incoming DC link voltage of 800 V (in case of three-phase systems) to a lower DC voltage to charge the battery of an electric vehicle. The DC/DC converter must be capable of delivering rated power to the battery over a wide range with the capability of charging the battery at constant current or at constant voltage modes, depending on the State Of Charge (SOC) of the battery.