Patent ID: 8094472
Filing Date: 2012-01-10
Classification: H02M,Y02B,Y02P

Abstract:
1. A power factor correction converter capable of fast adjusting load, mainly comprising: an input power supplying an AC voltage; a rectifier connected to the input power and rectifying the input power to be a DC voltage; a power factor correction component connected to one terminal of the rectifier to keep or release the energy rectified by the rectifier; a power switch connected respectively to the rest of terminal of power factor correction component and rectifier; a diode one terminal of which is connected to the power factor correction component and the power switch to block the energy generated from the other side of input power from being charged to the rectifier and the power switch; an energy-saving component connected to the diode and the power switch, the two terminals of energy-saving component defining a DC output voltage; a voltage sensor unit connected in parallel to the energy-saving component and used to convert the DC output voltage into a signal of analog input level; a load one terminal of which is connected to one terminal of DC output voltage; a first current sensor unit one terminal of which is connected to the other terminal of load, and the other terminal of which is connected to the other terminal of DC output voltage to acquire a current when the load varies; a microprocessor in which a software program is installed, which is connected to the voltage sensor unit and one terminal of the load; a gate driver connected to the power switch and the microprocessor and used to convert a pulse modulation signal generated by the microprocessor to drive the power switch; a second current sensor unit one terminal of which is connected to one terminal of the rectifier, and the other terminal of which is connected to the microprocessor; a zero crossover detection unit comprises one terminal of which is connected in parallel to the rectifier and the other terminal is connected to the microprocessor, which is used to detect a zero voltage of the voltage outputted by the rectifier and generate a pulse signal synchronous with the zero voltage; the zero crossover detection unit comprises a voltage step-down circuit and a zero crossover detection circuit; one terminal of the voltage step-down circuit is connected to the rectifier and another terminal is connected to the zero crossover detection circuit; and the zero crossover detection circuit is further connected to the microprocessor, and the zero crossover detection circuit outputs a pulse synchronous with the zero voltage of input waveform of the input power.