Patent ID: 9629210
Date: 2017-04-18
CPC Classifications: H05B,Y02B

Claim:
1. A driving circuit for driving a light emitting diode (LED) array, comprising: a positive voltage output terminal to be coupled to an anode of the LED array; a negative voltage output terminal to be coupled to a cathode of the LED array; a rectifier configured to operably rectify an alternating current (AC) voltage to generate a direct current (DC) voltage; a transistor coupled to the rectifier; a circuit ground terminal; a capacitor coupled between the positive voltage output terminal and the negative voltage output terminal; a diode; an inductor having a first terminal and a second terminal, coupled to the capacitor via the diode, and configured to operably provide a current to charge the capacitor when the transistor is turned off; and a control chip having a first pin coupled to the transistor and configured to operably provide a switching signal for controlling switching of the transistor so as to generate a stable output voltage between the positive voltage output terminal and the negative voltage output terminal, a second pin coupled to the circuit ground terminal, and a third pin configured to operably detect a voltage of the inductor; wherein, when the transistor is turned off, the control chip will directly detect the voltage of the inductor to acquire a discharging time of the inductor and the output voltage for implementing a zero-current switching function and an over-voltage protection function respectively.