A current oscillation detection device, method and power supply system of a pfc circuit

Abstract

The invention discloses a current oscillation detection device, method and power supply system of a PFC circuit. The device includes: a zero-crossing detection unit, a current detection unit, a wave detection unit and a control unit; The zero position of the AC voltage of the PFC circuit; the current detection unit is used to detect the sampling voltage signal of the power supply current of the PFC circuit at the zero position of the AC voltage of the PFC circuit; the detection unit is used to detect the The oscillation signal in the voltage signal is sampled and converted into a digital level signal; the control unit is used for judging whether there is an oscillation phenomenon in the power supply current of the PFC circuit according to the digital level signal. The solution of the present invention can solve the problem that the current oscillation phenomenon generated when the adjustment parameters of the PFC circuit do not match the power supply system cannot be identified, which affects the power supply reliability of the power supply system, and achieves the effect of improving the power supply reliability of the power supply system.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a current oscillation detection device, method and power supply system of a PFC circuit, in particular to a circuit, method and power supply system for detecting power supply current oscillation. Background technique [0002] With the wide application of various power electronic devices in various fields such as power systems, transportation, industry, and household use, the problem of current harmonic interference polluting the power grid has become increasingly prominent. A series of hazards, so the grid pollution problem has gradually attracted people's attention. In order to suppress the current harmonics generated by power devices and reduce grid pollution, some schemes will add power factor correction (PFC) circuits to higher-power equipment or electrical products to improve the harmonics generated by the equipment or electrical products themselves. d...

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Problems solved by technology

[0004] The object of the present invention is to provide a current oscillation detection device, method, and power supply system of a PFC circuit to solve the problem of not being able to identify the current oscillation phenomenon that occurs when the adjustment parameters of the PFC circuit do not match the power supply system and affect the power supply reliability of the power supply system. problems, to achieve the effect of improving the power supply reliability of the power system

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