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Two-way power supply automatic switching power supply circuit

An automatic switching, dual-circuit power supply technology, applied in circuit devices, emergency power supply arrangements, electrical components, etc., can solve the problems of low reliability, complex structure, large size, etc., to achieve simple circuit, small size, reliability high effect

Inactive Publication Date: 2016-09-21
AVIC TECH XIAMEN ELECTRIC POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a dual-channel power supply automatic switching power supply circuit, which solves the problems of the original dual-channel power supply automatic switching power supply circuit with complex structure, large volume and low reliability

Method used

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  • Two-way power supply automatic switching power supply circuit
  • Two-way power supply automatic switching power supply circuit
  • Two-way power supply automatic switching power supply circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] refer to figure 2 , in the present invention, the normally open contact KM1C of the AC contactor KM1 is connected in series between the live wire of the AC power supply A and the load, and the normally open contact KM2C of the AC contactor KM2 is connected in series to the AC Between the live wire of the power supply B and the load; one end of the normally closed contact KM1A of the AC contactor KM1 is connected to the neutral line N, and the other end is connected to one end of the coil KM2B of the AC contactor KM2; the other end of the coil KM2B One end is connected to the AC contactor KM3; one end of the normally closed contact KM2A of the AC contactor KM2 is connected to the neutral line N, and the other end is connected to one end of the coil KM1B of the AC contactor KM1, and the coil KM1B The other end is connected with the live wire of the AC power supply A. Thus, the AC contactor KM1 and the AC contactor KM2 form an electrical interlock.

[0030] The normally...

Embodiment 2

[0043] refer to image 3 , the second embodiment is basically the same as the first embodiment, the difference is: the normally open contact of the AC relay RLY1 is connected to the other end of the coil KM2B, and one end of the coil of the AC relay RLY1 is connected to the zero The other end is connected to the live wire of the AC power supply B.

[0044] working principle:

[0045] State one:

[0046] When the AC power supply A is charged and the AC power supply B is not charged at this time, the coil of the AC relay RLY1 is not energized, so the normally open contact of the AC relay RLY1 is in a disconnected state, causing the coil KM2B of the AC contactor KM2 to be de-energized, so the AC The normally open contact KM2C of the contactor KM2 is also in the disconnected state, and the normally closed contact KM2A of the AC contactor KM2 is in the closed state. At this time, the coil KM1B of the AC contactor KM1 is energized due to the closure of KM2A. There is current flow...

Embodiment 3

[0056] refer to Figure 4 The third embodiment is basically the same as the second embodiment, except that the selection control unit includes an AC relay RLY2 and an AC relay RLY3, one end of the coil of the RLY2 is connected to the neutral line N, and the other end is connected to the neutral line N. The live wire of the AC power supply B; the normally open contact of the RLY2 is connected to one end of the coil of the AC relay RLY3, and the other end of the coil of the AC relay RLY3 is connected to the neutral line N; the AC relay RLY3 The normally open contact is connected with the other end of the coil KM2B.

[0057] Working principle: The working principle of the third embodiment is basically the same as that of the second embodiment. The difference is that the selection control unit is composed of the AC relay RLY2 and the AC relay RLY3 in series. When the selection control unit is working, the AC relay RLY2 and the AC relay RLY3 acts sequentially to increase the actio...

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Abstract

The invention provides a two-way power supply automatic switching power supply circuit, and aims at solving the problems that the original two-way power supply automatic switching power supply circuit is complicated in structure, large in size and low in reliability. The two-way power supply automatic switching power supply circuit comprises an AC power supply A, an AC power supply B, a selection control unit and an interlock control unit, wherein the selection control unit and the interlock control unit are mutually connected; the interlock control unit comprises an AC contactor KM1 and an AC contactor KM2 which are in interlock connection; a normally open contact KM1C of the AC contactor KM1 is connected between a live wire of the AC power supply A and a load in series; a normally open contact KM2C of the AC contactor KM2 is connected between the live wire of the AC power supply B and the load in series; and the selection control unit is used for controlling selection of suction of the normally open contact KM1C of the AC contactor KM1 or the normally open contact KM2C of the AC contactor KM2 and avoiding a short circuit caused by competition of two ways of power supplies when the AC power supply A and the AC power supply B are simultaneously powered on.

Description

technical field [0001] The invention relates to the field of power supply switching control circuits, in particular to a dual-way power supply automatic switching power supply circuit. Background technique [0002] In many power supply occasions, such as small substations, power plants, chemical plants, etc., the load needs continuous power supply. In these occasions, two power supplies are used as backup for each other to improve the reliability of power supply. Switching to the backup power supply will cause the load to have no power supply for a period of time in the middle, and unattended operation cannot be realized. [0003] Although the dual-channel power supply automatic switching power supply circuit solves the problem of manually switching the backup power supply during a power failure, the structure design of the existing dual-channel power supply automatic switching power supply circuit is complicated. The reliability of the system is reduced, and the response s...

Claims

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Application Information

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IPC IPC(8): H02J9/06
CPCH02J9/06
Inventor 叶彬城陈文全孟超
Owner AVIC TECH XIAMEN ELECTRIC POWER TECH CO LTD
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