Patent ID: 8102677
Filing Date: 2012-01-24
Classification: H02M,Y02B

Abstract:
1. A resonant switching power supply device comprising: a first switching element and a second switching element which are configured to convert and adjust power, wherein a capacitance of a first gate-drain capacitor existing between a gate and a drain of the first switching element and a resistance of a first gate resistor of the first switching element are set such that, in a period during which a resonance current flows by switching the second switching element, a gate-source voltage of the first switching element is lower than an ON threshold voltage of the first switching element due to the resonance current divided into the first gate-drain capacitor, and wherein a capacitance of a second gate-drain capacitor existing between a gate and a drain of the second switching element and a resistance of a second gate resistor of the second switching element are set such that, in a period during which a resonance current flows by switching the first switching element, a gate-source voltage of the second switching element is lower than an ON threshold voltage of the second switching element due to the resonance current divided into the second gate-drain capacitor.