Bidirectional active power conditioner with DC/AC inverter in low-frequency switching
AssigneeAblerex Electronics Co., Ltd.
InventorsYa-Tsung Feng, Chin-Chang Wu, Hung-Liang Chou
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Abstract
A bidirectional active power conditioner includes a DC side, a bidirectional DC/DC power converter, a DC/AC inverter and an AC side. The DC side electrically connects with a DC source while the AC side electrically connects with a load and an AC source. The bidirectional DC/DC power converter is controlled via high-frequency pulse width modulation (PWM) switching so as to generate a predetermined DC voltage or DC current while the DC/AC inverter is controlled to convert the predetermined DC voltage or DC current into a predetermined AC voltage or AC current.
Claims18
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.
Dependencies are inferred from the claim text.