Patent ID: 8710745
Filing Date: 2014-04-29
Classification: H05B,Y02B

Abstract:
1. An LED drive circuit, comprising: a protection unit, which is connected to an AC power supply; a rectification filter unit, which is electrically connected to the protection unit; a control unit, which has an end electrically connected to the rectification filter unit; an LED driving unit, which comprises an LED, a first capacitor, and a transistor, the LED being connected in parallel with the first capacitor, the LED comprising a positive terminal and a negative terminal, the positive terminal of the LED being electrically connected to the rectification filter unit and the control unit; and a current detection feedback unit, which is arranged between the LED driving unit and the control unit, the current detection feedback unit comprising: a first resistor, a second resistor, a third resistor, and a fourth resistor, the first resistor having an end electrically connected to an end of the second resistor and the control unit, the first resistor having an opposite end electrically connected to the negative terminal of the LED, the second resistor having an opposite end electrically connected to the transistor, an end of the third resistor, and an end of the fourth resistor, wherein the third resistor is connected in parallel with the fourth resistor and an opposite end of the third resistor and an opposite end of the fourth resistor are grounded.