Power factor correcting device and correcting method thereof

Abstract

The invention discloses a power factor correcting device and a correcting method of a power factor. The power factor correcting device and the correcting method of the power factor keep that an input current is in a simple sinusoidal alternating current form and keeps the input current shares the same phase with an input alternating voltage. An alternating voltage is converted into a full-wave rectification form through a full-bridge rectifier, and is converted into a direct current output voltage through an inducer, a power transistor and a power diode. A current compensating circuit and a voltage compensating circuit respectively generate a compensating current signal and a compensating voltage signal after respectively comparing a correcting current and an output voltage respectively with a reference signal and a reference voltage, and an updated pulse width modulation signal is generated according to the compensating current signal and the compensating voltage signal. The reference current signal is obtained through multiplying the compensating current signal by the compensating voltage signal through a multiplication gainer, so that the input current can be corrected without the needs of sampling an input voltage according to the technology, and response speed of an internal circuit is improved.

Description

technical field [0001] The present invention relates to a correction technology, in particular to a power factor correction device and a correction method thereof. Background technique [0002] Today's power supply industry's pursuit of high-quality power supply and demand has always been the goal that countries around the world want to achieve. However, building a large number of power plants is not the only way to solve the problem. Power factor (power factor) or efficiency can effectively solve the problem. The main function of the power factor corrector is to make the phase of the input voltage of the electrical product and the input current the same, which means that the load of the electrical product is similar to a resistive load, and effectively reduces the harmonic distortion of the input current ( current harmonic distortion) to achieve high power factor of power supply. [0003] A general power factor correction device not only needs a pulse width modulation sig...

AI Technical Summary

Problems solved by technology

Since the above-mentioned patent uses an integrator or an integrating capacitor inside or outside the circuit, the response speed of the internal circuit will be greatly reduced. In addition, a switch is required inside the circuit for discharging the integrating capacitor, which will increase the power consumption. And increase the circuit space

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