Current mutual inductance type three-phase rectifier power supply device

Abstract

The invention provides a current mutual inductance type three-phase rectifier power supply device comprising a current mutual inductor CT1, a current mutual inductor CT2, a current mutual inductor CT3, a three-phase rectifier circuit used for circuit rectifying, an n-type filter circuit used for circuit filtering and a voltage stabilizing circuit used for voltage stabilizing. The current mutual inductors CT1, CT2 and CT3 are used for three-phase voltage induction. According to the arrangement, the problem that by directly bearing the voltage, electronic elements are frequently damaged is solved, and a protection control device, used for a three-phase motor and three-phase resistance-capacitance electric equipment, is powered in a reliable and safe manner.

Description

technical field [0001] The invention relates to a rectifying power supply device, in particular to a current mutual induction type three-phase rectifying power supply device. Background technique [0002] In the protection and control circuit of low-voltage three-phase 380V electrical equipment, such as three-phase motors and resistance-capacitance electrical equipment, the auxiliary working power is often directly provided by low-voltage three-phase 380V. If such an auxiliary power supply adopts a power transformer isolation step-down method, there is a defect that the power transformer is large in size and unrealistic. Usually, the resistance-capacitance step-down is performed first, and then enters the three-phase rectification circuit. After rectification and filtering, it is supplied to the protection control circuit. However, the resistance-capacitance step-down method is to directly apply the 380V auxiliary working power supply to both ends of the electronic componen...

AI Technical Summary

Problems solved by technology

[0006] Compared with the prior art, the present invention has outstanding substantive features and significant progress. Specifically, the present invention adopts a simple circuit design, that is, by setting a current transformer, a three-phase rectifier circuit, a Π-type filter circuit and a voltage stabilizing circuit, It solves the problem of frequent damage to electronic components caused by direct line voltage, and provides a safe and reliable power supply for the protection and control devices of three-phase motors and three-phase resistance-capacitance electrical equipment.

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