Patent ID: 8729807

Claim:
A light emitting diode (LED) driving circuit, comprising: a power conversion module having an input end, an output end and a control end, wherein the input end of the power conversion module is configured for receiving an input voltage, the control end of the power conversion module is configured for receiving a control signal so as to control the regulation of a duty cycle signal in the power conversion module according to the control signal, and the power conversion module outputs a DC voltage having a constant current and a variable voltage value via the output end of the power conversion module according to the input voltage and the control signal; an overcurrent protection circuit, comprising: a switch module having a first end, a second end and a third end, wherein the first end of the switch module is connected to a first end of an LED load; and a first resistor having a first end and a second end, wherein the first end of the first resistor is connected to the third end of the switch module, the second end of the first resistor is connected to the second end of the switch module, a second end of the LED load and the second end of the first resistor are connected to the output end of the power conversion module, the overcurrent protection circuit detects that whether a current flowing through the first resistor is an overcurrent, so as to turn off the electrical channel between the LED load and the power conversion module through the switch module when the overcurrent occurs; and an overvoltage protection circuit for detecting whether the DC voltage is an overvoltage, so as to output the control signal when the overvoltage occurs, thereby performing overvoltage protection on the LED load according to the control signal.