Patent ID: 6930896

Claim:
A power regeneration circuit for a power conversion system comprising a converter transformer having an intermediate tap of the primary coil, a first switching element connected between an end of the primary coil of the converter transformer and the ground, a second switching element connected between the other end of the primary coil and the ground, and a smoothing capacitor connected in parallel to a DC voltage source between the intermediate tap of the primary coil of the converter transformer and the ground, the power regeneration circuit being used for power regeneration of the power conversion system for turning on/off the switching elements alternately with an in-between period of turning off the switching elements, the power regeneration circuit further comprising at least a charge/discharge element connected in parallel to the coil portion between one end of the primary coil and the intermediate tap, and a charge/discharge path forming a first closed circuit of the coil portion and the charge/discharge element in response to the transition of one of the switching elements connected to one end of the primary coil to off state, the charge/discharge path forming a second closed circuit of the coil portion, the charge/discharge element and the smoothing capacitor in response to the transition of the other switching element to off state.