Power circuit applied in LED load

A power circuit applied in a LED load, comprising:

• a power converter configured to receive an input voltage and convert the input voltage into a DC output voltage;
• a first feedback module electrically coupled to an output terminal of the power converter, and configured to detect the DC output voltage and an output current of the power converter and to output a first feedback signal;
• a second feedback module electrically coupled to the output terminal of the power converter, and configured to detect the DC output voltage and the output current of the power converter and to output a second feedback signal, wherein the second feedback module and the first feedback module are independent to each other;
• and
• a control circuit electrically coupled to the first feedback module, the second feedback module and the power converter, wherein the control circuit is configured to output a control signal according to the first feedback signal or the second feedback signal, so as to control the power converter on the basis of the control signal and make an output power of the power converter smaller than a predetermined power threshold;
• wherein the first feedback module comprises:
• a first current control unit configured to detect the output current of the power converter, compare the output current with a preset output current reference, and output a current control signal;
• and
• a first voltage control unit configured to detect the DC output voltage of the power converter, compare the DC output voltage with a preset output voltage reference, and output a voltage control signal;
• wherein the first feedback module outputs the first feedback signal according to the current control signal and the voltage control signal;
• wherein the second feedback module comprises:
• a second current control unit configured to detect the output current of the power converter, compare the output current with a preset output current reference, and output a current control signal;
• and
• a second voltage control unit configured to detect the DC output voltage of the power converter, compare the DC output voltage with a preset output voltage reference, and output a voltage control signal;
• wherein the second feedback module outputs the second feedback signal according to the current control signal and the voltage control signal;
• wherein if any one of the first and second feedback modules has a failure, the other one of the first and second feedback modules controls current and voltage of the power converter so as to control the output power of the power converter;
• wherein the first current control unit is a constant current feedback unit or an overcurrent protection unit, and the first voltage control unit is a constant voltage feedback unit or an overvoltage protection unit;
• wherein the second current control unit is a constant current feedback unit or an overcurrent protection unit, and the second voltage control unit is a constant voltage feedback unit or an overvoltage protection unit.