A method and system for estimating control parameters of a power factor correction circuit

Abstract

The application discloses a kind of estimation method and system of power factor correction circuit control parameter, including grid voltage after voltage dividing circuit is sent into the AC half-wave voltage signal of comparison circuit, generates a reference voltage signal and is sent into comparison circuit, the output signal of comparison circuit is sent into MCU inside;Capture the rising edge of comparison circuit output signal as the instruction of counter zero setting action, and record the count value at this moment, capture comparator output falling edge, record the count value at falling edge moment, and the count frequency is obtained by the operation of MCU internal register to time base frequency division, record count period;The period of half-wave is obtained by counting calculation, the frequency of grid voltage is obtained, and the phase of grid voltage is obtained;The amplitude of ideal sine function and the proportional relationship between phase angle are estimated to obtain the rectification half-wave voltage amplitude of power factor correction circuit.The application solves the problem that actual grid voltage sampling result exists interference and cannot reflect the real waveform of grid voltage.

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