Abstract
The present invention provides a circuit system of switch mode high power factor power converter AC output, which is characterized in that a first stage converter and a second stage converter share a switch element and are connected into a graft power processor. Furthermore, both ends of the switch element are separately connected with a diode capable of blocking voltage or conducting current. The present invention can eliminate the use of a switch element for the second stage converter while maintaining good characteristics of the original circuit. Therefore, the present invention has the benefits of: (1) eliminating the use of a switch element, a drive circuit, an energy storage element and a control circuit, particularly lowering the cost significantly by the elimination of one expensive switch element; (2) reducing the volume and weight of the product; (3) increasing the reliability; and (4) increasing the efficiency.