Three-phase four-wire switching power supply with high zero-line judgment efficiency

Abstract

The invention discloses a three-phase four-wire switching power supply with high zero-line judgment efficiency, wherein a high-frequency filter anti-interference circuit is connected with a switching voltage stabilizing power circuit; a zero-line judging circuit and a voltage-stabilizing circuit with a circuit gating function are arranged between a rectifying circuit and the high-frequency filter anti-interference circuit; the rectifying circuit is respectively connected with the input end of the zero-line judging circuit and the input end of the voltage-stabilizing circuit with the circuit gating function; the output end of the zero-line judging circuit and the output end of the voltage-stabilizing circuit with the circuit gating function are switched in the high-frequency filter anti-interference circuit; and the control signal output end of the zero-line judging circuit is connected with the voltage-stabilizing circuit with the circuit gating function. The three-phase four-wire switching power supply of the invention can ensure that the switching power supply can work in the case of no zero line and prevent the switching power supply from being damaged in the event that phase dislocation occurs between the zero line and a phase line in the switching power supply, thus enhancing practicability and reliability of the switching power supply, and being beneficial to popularization and application of the three-phase four-wire switching power supply to more electric equipment.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a three-phase four-wire switching power supply for neutral line judgment. technical background [0002] In the past, the power supply scheme used by most electrical appliances was powered by a transformer. With the development of science and technology, people began to consider using switching power supply with small size, light weight, high efficiency, strong anti-interference ability and wide output voltage range as the power supply solution for electrical appliances. For the existing three-phase four-wire switching power supply, in the absence of neutral wire or wrong phase, the three-phase four-wire switching power supply will not work normally, seriously affecting the normal use of three-phase electrical appliances, so the three-phase four-wire switching power supply is used The scheme of switching power supply for powering electrical equipment still needs ...

AI Technical Summary

Problems solved by technology

For the existing three-phase four-wire switching power supply, in the absence of neutral wire or wrong phase, the three-phase four-wire switching power supply will not work normally, seriously affecting the normal use of three-phase electrical appliances, so the three-phase four-wire switching power supply is used The scheme of switching power supply for powering electrical equipment still needs continuous improvement

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