Patent ID: 8467198
Filing Date: 2013-06-18
Classification: H02J,H02M,Y02E

Abstract:
1. A DC-to-AC converting circuit with a wide input voltage range for converting an input voltage into an AC output voltage, said DC-to-AC converting circuit comprising: a transformer comprising a primary side and a secondary side, said primary side comprising a first connecting terminal, a second connecting terminal, a third connecting terminal, a first primary winding and a second primary winding, said secondary side comprising a secondary winding, wherein said first primary winding and said second primary winding are serially connected with said first, second and third connecting terminals; a first modulation switching circuit, a second modulation switching circuit and a third modulation switching circuit connected with said first, second and third connecting terminals, respectively; an inverter switching circuit connected to said secondary side of said transformer for converting voltage and current outputted from said secondary winding into an AC output voltage and an AC output current, respectively; and a controlling unit connected to said first, second and third modulation switching circuits and said inverter switching circuit for controlling on/off statuses of said first, second and third modulation switching circuits and said inverter switching circuit, thereby controlling operations of said DC-to-AC converting circuit, wherein under control of said controlling unit, two of said first, second and third modulation switching circuits are selectively enabled according to the magnitude of said input voltage, so that electric energy of said input voltage is magnetically transmitted to said first primary winding, a second primary winding or a serially-connected winding assembly of said first primary winding and said second primary winding, and a turn ratio of said transformer is adjustable.