Patent ID: 8305787
Filing Date: 2012-11-06
Classification: H02M,H05B,Y02B

Abstract:
1. A power supply controller comprising: a delayed ramp generator configured to generate a delayed ramp signal; an integrator coupled to integrate an input current sense signal representative of an input current and to generate an input charge signal in response thereto, wherein the input current has a pulsating waveform with a period that is a switching period of a switch of the power supply; an arithmetic operator circuit coupled to generate an input charge control signal responsive to the input charge signal and a ratio of an input voltage sense signal to an output voltage sense signal, wherein the input voltage sense signal is representative of a rectified input voltage of the power supply and the output voltage sense signal is representative of a dc output voltage of the power supply; and a drive signal generator coupled to receive the delayed ramp signal and the input charge control signal and to generate a drive signal in response thereto to control the switch to regulate an output of the power supply.