Patent ID: 7330366
Filing Date: 2008-02-12
Classification: H02M,Y02B

Abstract:
1. A DC-AC converter, suitable for converting a DC input power to an AC output power, comprising: a voltage boost module, having a voltage bypass circuit and a voltage boost circuit, the voltage bypass circuit and the voltage boost circuit receiving an input voltage from the DC input power, and the voltage bypass circuit transferring the input voltage for a DC output voltage, and the voltage boost circuit being enabled to boost the input voltage to its output voltage when the DC output voltage transferred by the voltage bypass circuit is not high enough to meet a need for an AC output voltage level; a DC-AC converting module, receiving the output voltage from the voltage boost module and converting the received voltage into the required AC output power; a voltage transformer, having a primary winding and a secondary winding, wherein an output voltage value at the secondary winding is determined by a provided voltage value at the primary winding; a primary control circuit, electrically coupled with both of the voltage boost module and the primary winding, the primary control circuit having a plurality of switches and, based on an ON/OFF status of the switches, transferring the voltage received by the voltage boost module to the primary winding; a secondary control circuit, electrically coupled to the secondary winding and transferring the voltage received from the secondary winding to the required AC output power; wherein the primary control circuit comprises: a first switch and a second switch, one end of the first switch coupled with one end of the second switch and the primary winding, and another ends of the first switch and the second switch respectively coupled with output ends of the voltage boost module; and a third switch and a fourth switch, the third switch coupled with ends of the fourth switch and the primary winding, and another ends of the third switch and the fourth switch respectively coupled with output ends of the voltage boost module; and a feedback module, wherein the feedback modules decides a required voltage value by the voltage boost circuit based on a difference between an output from the DC-AC converting module and a preset value and wherein the feedback module comprises: