Control method for inhabiting input current waveform harmonic distortion

Abstract

The invention discloses a control method for inhabiting input current waveform harmonic distortion. The method is applicable to a power factor corrector, and comprises the following steps that (a) current command signals output by an operation circuit are received; (b) the current command signals are compared with input current to obtain current error signals; (c) the current error signals are regulated; (d) whether the power factor corrector operates in a switching state conversion interval of the first mode and the second mode or not is judged, if the judging result shows that the power factor corrector operates in the switching state conversion interval, the current error signals before the regulation and the forward feed signals are subjected to additive operation, and in addition, the operation result and the current error signals after the regulation are subjected to additive operation for generating current control signals; (e) switching control signals are generated according to the current control signals, so that the switching switch operation of a power supply conversion circuit is controlled, and the input current waveform harmonic distortion of the power supply conversion circuit is inhabited.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for suppressing harmonic distortion of an input current waveform. 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. On the one hand, the energy of power supply is increased, and on the other hand, the power of electrical products is increased. Factor (Power Factor) or efficiency can effectively solve the problem. [0003] The main function of the power factor corrector (Power Factor Corrector, PFC) is to compensate the phase difference between the current and the voltage generated by the electrical appliance, so that the input voltage of the electrical appliance is in the same phase as the input current, so as to achieve a high power factor of the power su...

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a control method for suppressing the harmonic distortion of the input current waveform, so as to solve the problem of the input current waveform in the transition interval between the discontinuous conduction mode and the continuous conduction mode of the existing power factor corrector. Has the disadvantage of excessive harmonic distortion, which will affect the quality of input power

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