Patent ID: 9024601
Filing Date: 2015-05-05
Classification: H02M,H05B,Y02B

Abstract:
1. A voltage converting apparatus, comprising: a pulse width modulation signal generating circuit, receiving a feedback power to be an operating power and generating a pulse width modulation signal; a power transistor, having a first terminal, a second terminal and a control terminal, wherein the first terminal of the power transistor receives an input voltage, the control terminal of the power transistor is coupled to the pulse width modulation signal generating circuit and receives the pulse width modulation signal, and the second terminal of the power transistor is coupled to a first reference ground; a first inductor, serially connected between the first reference ground and a first output terminal of the voltage converting apparatus; a second inductor, having a terminal coupled to the first reference ground, and a second terminal of the second inductor coupling with a voltage on the first inductor and generating a coupling voltage; a feedback rectifier, coupled between the second terminal of the second inductor and a terminal of the pulse width modulation signal generating circuit for receiving the feedback power, and rectifying the coupling voltage to generate the feedback power; and a feedback resistor, serially connected between the pulse width modulation signal generating circuit and the second terminal of the second inductor, wherein the pulse width modulation signal generating circuit detects a zero-current phenomenon of the first inductor through the feedback resistor, wherein, the feedback power is used to be an auxiliary operating power of the pulse width modulation signal generating circuit.