Patent ID: 9209699
Filing Date: 2015-12-08
Classification: H02M,Y02B

Abstract:
1. A power supply comprising: a bridge rectifier receiving an input voltage of an alternating-current (AC) power supply, and rectifying the input voltage to produce a full-wave rectified voltage; a film capacitor receiving the full-wave rectified voltage, and filtering the full-wave rectified voltage to produce a first pulsating direct-current (DC) voltage; and a DC-to-DC converter comprising a control circuit, with the control circuit receiving the first pulsating DC voltage, sampling the first pulsating DC voltage to produce a second pulsating DC voltage, detecting a peak value and a valley value of the second pulsating DC voltage, and producing an over current protection (OCP) compensation value according to the second pulsating DC voltage, the peak value and the valley value, with the OCP compensation value being −(Vx−VH)+PH, where Vx refers to the second pulsating DC voltage, VH refers to the valley value, and PH refers to the peak value, with the control circuit providing an OCP function and a constant output power limitation for the DC-to-DC converter according to a compensated OCP setting value produced by adding the OCP compensation value to an OCP setting value.