Method and device for controlling parallel interleaving parallel feedback circuit (PFC)

Abstract

The invention discloses a method and a device for controlling a parallel interleaving parallel feedback circuit (PFC), wherein the method comprises the following steps: controlling to acquire a voltage loop output quantity by a voltage outer loop, and acquiring a current reference waveform by a voltage loop output quantity and an input voltage of a circuit; depending on the current reference waveform as well as sampled branch currents of n pieces of branches, controlling various branch current loops, respectively acquiring current loop outputs of the various branches, and making the waveforms of the various branch currents follow the current reference waveform; calculating an ideal driving feedforward quantity, depending on the current loop outputs of the various branches as well as the ideal driving feedforward quantity, acquiring a final driving output value; and sending a wave by the driving pulses of the n pieces of branches depending on the final driving output value. According to the technical scheme, the current ripple voltage on the inductor is reduced, and the frequency of the ripple current is doubled, thereby reducing the ripple of the inductor and the heating and improving the efficiency of the device.

Description

technical field [0001] The present invention relates to the technical field of switching power supplies, in particular to a parallel interleaved power factor correction (Power Factor Correction, PFC for short) circuit control method and device. Background technique [0002] At present, with the development of power electronics technology, the miniaturization and high power density of electronic equipment have become the embodiment of product competitiveness and technical level. The PFC rectifier module directly affects the input index and the ability to carry the post-stage load, so it puts forward relatively high requirements for the circuit design. With the improvement of the power level of the power supply, the traditional boost (BOOST) PFC circuit and control method are no longer suitable for the front-end rectification circuit of the high-power power supply. [0003] At present, in the application occasions of high current and high power, multiple parallel BOOST PFC ci...

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Problems solved by technology

[0014] The present invention provides a parallel interleaved PFC circuit control method and device to solve the problem in the prior art that the default branch currents are completely the same, but simply adopting the same control results in poor current sharing effect and even causes oscillations

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