Patent ID: 9042140
Filing Date: 2015-05-26
Classification: H02M,Y02B

Abstract:
1. A bridge-less step-up switching power supply device comprising: a first input terminal and a second input terminal connected to an AC power supply; a first output terminal and a second output terminal connected to a load; a first reactor including a first main winding connected to the first input terminal and a first auxiliary winding magnetically coupled to the first main winding and connected to the first main winding, the first auxiliary winding having a first leakage inductance; a second reactor including a second main winding connected to the second input terminal and a second auxiliary winding magnetically coupled to the second main winding and connected to the second main winding, the second auxiliary winding having a second leakage inductance; a first diode connected between the first auxiliary winding of the first reactor and the first output terminal; a second diode connected between the second auxiliary winding of the second reactor and the first output terminal; a first capacitor connected between the first output terminal and the second output terminal; a first switch connected between a connection point of the first main winding and the first auxiliary winding of the first reactor, and the second output terminal; a second switch connected between a connection point of the second main winding and the second auxiliary winding of the second reactor, and the second output terminal; a third switch connected to the connection point of the first main winding and the first auxiliary winding of the first reactor; a fourth switch connected to the connection point of the second main winding and the second auxiliary winding of the second reactor; a second capacitor connected between a connection point of the third switch and the fourth switch, and the first output terminal or the second output terminal; and a controller controlling turning on/off of the first switch, the second switch, the third switch, and the fourth switch.