Patent ID: 8724352
Filing Date: 2014-05-13
Classification: H02M

Abstract:
1. A power supply apparatus driving circuit which is provided in a power supply apparatus that outputs an auxiliary supply voltage, the power supply apparatus including a DC power supply input section to which a DC input voltage is inputted, a series circuit that is connected to both ends of the DC power supply input section directly or indirectly via a circuit element, and includes at least a first switching element on a low side and a second switching element on a high side, the first switching element and the second switching element having ground levels different from each other, and a switching element control circuit that generates a switching control signal to control the first switching element and the second switching element, the power supply apparatus driving circuit comprising: a driving circuit that controls a voltage on a control terminal of each of the first switching element and the second switching element on a basis of the switching control signal; and a starting circuit that supplies a starting supply voltage to the switching element control circuit and the driving circuit from the DC input voltage at startup, the starting circuit shutting off supply of the starting supply voltage when the auxiliary supply voltage is supplied to the switching element control circuit and the driving circuit after startup.