An Active Power Factor Correction Controller

Abstract

The invention relates to the electronic circuit technology, and in particular relates to an active power factor correction controller. The active power factor correction controller, according to the invention, comprises a current sampling module, a power device, an error amplifier, a compensation network, a multiplication and division modulation circuit, a hysteresis comparison module, a logic module and a driving module. The current sampling module collects an inductive current; the hysteresis comparison module carries out hysteresis comparison between a waveform of the inductive current and an output waveform of the inductive current, so as to control a duty ratio and realize an average current hysteresis control mode; and at the same time, a feedback signal and an inputted sine wave are modulated by a multiplier to achieve power factor correction. The beneficial effects of the invention are that: compared with the prior art, the active power factor correction controller has the advantages of fast response speed and small external inductance, greatly reduces the volume of the PCB, lowers the requirement for the compensation network, and reduces the chip area and the power consumption. The invention is particularly suitable for the active power factor corrector.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to an active power factor correction controller. Background technique [0002] A switch-mode power supply presents a non-linear impedance to the mains supply due to the input circuit, which typically consists of a half-wave or full-wave rectifier followed by a storage capacitor capable of maintaining the voltage close to the peak value of the input sine wave At the voltage value, the capacitor will not charge until the next peak value arrives. At this time, the capacitor only absorbs current at each peak of the input waveform. At this time, the current pulse energy is very large, which is about 5 to 10 times the average current. In this case, the current drawn from the grid source is significant for the active power required to perform the desired work, adding losses and costs associated with distribution generation and the underlying equipment in the associated processes. Since the...

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Problems solved by technology

At present, the commonly used power factor corrector is to control the duty cycle by generating PWM waves internally. The control modes are mainly voltage mode and current mode. The disadvantage of the voltage mode is that the loop gain is greatly affected by the input voltage. The loop gain of the continuous mode There are double poles in the circuit; the disadvantage of the current mode is that when the duty cycle is greater than 50%, disturbances will occur, forming loop oscillations, so slope compensation is required

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