Direct-current power supply circuit

Abstract

The invention discloses a direct-current power supply circuit, relates to the technical field of power supply, and aims to solve the technical problem that the prior direct-current power supply circuit embedded in an apparatus cannot provide stable and reliable direct-current power for semaphores related to the apparatus. The circuit comprises a rectifying unit, an over-current detection unit andan over-voltage detection unit orderly connected, and is characterized in that: the rectifying unit consists of two groups of parallelly connected rectifying circuits, and a direct-current output endof each group of the rectifying circuits is provided with a rectifying circuit output indicating circuit; the over-current detection unit is parallelly connected with a mechanism blockage indicating circuit; the over-voltage detection unit consists of an over-voltage relay and a returned voltage regulating circuit; an off switch of the over-voltage relay is connected with the output of the over-current detection unit, while an on switch is connected with the returned voltage regulating circuit; and a direct-current output end of the over-voltage relay is provided with a direct-current output indicating circuit. The direct-current power supply circuit has high reliability.

Description

technical field [0001] The invention relates to power supply technology, in particular to a technology for a DC power supply circuit used in instruments and equipment. Background technique [0002] Most electrical control centers such as substations and power plants are equipped with various devices for equipment protection and monitoring. These devices generally use DC power supply. However, due to scale and cost reasons, many control centers do not have DC power supply. facility. [0003] Therefore, when many manufacturers develop instruments and equipment, they integrate the AC-DC conversion circuit inside the equipment to provide DC power for the equipment. However, many signal quantities related to the equipment (such as remote signals, indicator lights, etc.) If the power supply is powered by the built-in AC-DC conversion circuit of the instrument, since this circuit only provides one input and cannot be connected to the emergency power supply, the reliability of its ...

AI Technical Summary

Problems solved by technology

[0002] Most electrical control centers such as substations and power plants are equipped with various devices for equipment protection and monitoring. These devices generally use DC power supply. However, due to scale and cost reasons, many control centers do not have DC power supply. facility

[0003] Therefore, when many manufacturers develop instruments and equipment, they integrate the AC-DC conversion circuit inside the equipment to provide DC power for the equipment. However, many signal quantities related to the equipment (such as remote signals, indicator lights, etc.) If the power supply is powered by the built-in AC-DC conversion circuit of the instrument, since this circuit only provides one input and cannot be connected to the emergency power supply, the reliability of its power supply input is poor, and its output voltage and current cannot be monitored. The operating personnel cannot know its working status in real time, and the reliability is not high

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