POWER CONVERSION AND POWER FACTOR CORRECTION CIRCUIT FOR POWER SUPPLY DEVICE

摘要

A method and a power conversion and power factor correction circuit (100) includes at least one switching mode (90, 92) for power supply device, an AC/DC converter (50) and a DC/DC converter (60) that converts input power received from an input, into output power. The DC/DC converter (60) includes a converter switch (124) electrically coupled with the input. The power conversion and power factor correction circuit (100) also includes a circuit that receives a sensing signal (Vsense) selected by a user, converts the sensing signal (Vsense) into a control signal (Vcontrol) proportional to the output power, compares the control signal (Vcontrol) with a threshold signal, and controls the switching mode (90, 92).