Patent ID: 7049793
Filing Date: 2006-05-23
Classification: H02M

Abstract:
1. A boost switching power supply, comprising: a first magnetic element having a coil wound on a first magnetic core and a first diode that are serially connected between one terminal of a power source and one terminal of a first capacitor for smoothing; a first switching element connected between a first node where the first magnetic element and the first diode are connected and the other terminal of the power source; a second magnetic element and a second switching element that are serially connected between the first node and the other terminal of the power source; a second diode and a second capacitor that are serially connected between a second node where the second magnetic element and the second switching element are connected and the first node; and a third magnetic element having a coil wound on the first magnetic core and connected between the first node and the second magnetic element, the first magnetic element and the third magnetic element having coils wound on the first magnetic core and the polarities of the first and third magnetic element being opposite to each other causing energy that is in the third magnetic element to be regenerated via the first core as input power to the first magnetic element upon the second switching element transitioning from an ON state to an OFF state.