Patent ID: 9692317
Date: 2017-06-27
CPC Classifications: H02M

Claim:
1. A power control circuit comprising: a primary auxiliary winding configured to induce a voltage provided by a power circuit to generate an induced voltage; a startup module configured to provide a startup voltage; a power control module connected to the startup module, configured to output a control signal which is configured to control the power circuit to supply power when the startup voltage input to the power control module is less than an upper threshold voltage, wherein the power control module comprises an input port, a ground port, and an output port, the startup module comprises a startup resistor and a startup capacitor, the startup resistor and the startup capacitor are connected between a power source and ground in series, a connection node of the startup resistor and the startup capacitor constitutes an output port of the startup module and outputs the startup voltage, the input port of the power control module connects to the connection node, the output port of the power control module is configured to connect to the power circuit, and the ground port of the power control module is grounded; a rectifier module connected to the primary auxiliary winding, configured to rectify the induced voltage generated by the primary auxiliary winding; and a clamping module connected between the rectifier module and the startup module configured to clamp the induced voltage under the upper threshold voltage.