Patent ID: 7733670

Claim:
A bidirectional active power conditioner, comprising: a DC side connected to a DC source; a bidirectional DC/DC power converter having a high-frequency isolation transformer with a primary side and a secondary side, with each of the primary and secondary sides having a plurality of power electronic switches respectively, with the primary side connecting to the DC side and the power electronic switches being disabled or controlled via high-frequency PWM switching; a DC/AC inverter having four power electronic switches and connecting with the secondary side of the bidirectional DC/DC power converter, with said power electronic switches of the DC/AC inverter being disabled or controlled via low frequency switching; an AC side connected with the DC/AC inverter, said AC side further connected with one or both of a load and an AC source; and a filter capacitor having two points directly connecting with two connecting points of the power electronic switches of the DC/AC inverter, wherein each connecting point forms a point where two power electronic switches of the DC/AC inverter connects in series, wherein an output current of the power electronic switches of the secondary side of the bidirectional DC/DC power converter equals an input current of the power electronic switches of the DC/AC inverter; wherein when power is transmitted from the AC side to the DC side, the power electronic switches of the DC/AC inverter are all disabled to act as a rectifier, the power electronic switches at the primary side are all disabled, and the power electronic switches at the secondary side are controlled via high-frequency PWM switching; wherein in a bidirectional power flow, the power electronic switches of the DC/AC inverter are all controlled via low frequency switching, and the power electronic switches of the bidirectional DC/DC power converter are all controlled via high-frequency PWM switching, with the bidirectional DC/DC power converter generating a predetermined DC voltage or a predetermined DC current and the DC/AC inverter converting the predetermined DC voltage or the predetermined DC current into a predetermined AC voltage or a predetermined AC current when power is transmitted from the DC side to the AC side.