CN203788042U

CN203788042U - Circuit capable of realizing automatic switching of two-way power supply

Info

Publication number: CN203788042U
Application number: CN201420084022.6U
Authority: CN
Inventors: 郭敬番; 曾光
Original assignee: White Clouds Water Chestnut Electro-Mechanical Force Electronics Co Ltd Of Guangzhou Toshiba
Current assignee: White Clouds Water Chestnut Electro-Mechanical Force Electronics Co Ltd Of Guangzhou Toshiba; Guangzhou Toshiba Baiyun Ling Machine Power Electronics Co Ltd
Priority date: 2014-02-26
Filing date: 2014-02-26
Publication date: 2014-08-20
Anticipated expiration: 2024-02-26

Abstract

The utility model discloses a circuit capable of realizing automatic switching of a two-way power supply. According to the circuit, a main contact of a contactor KM1 is connected between a work power supply AC1 and an output power supply, a coil of a relay KT1 is connected between a wire A1 and a wire C1 of the work power supply AC1, one end of a coil of the contactor KM1 is connected to the wire A1 of the work power supply AC1, the other end of the coil of the contactor KM1 is connected with a normally-closed contact of a contactor KM2, a time-delay closing normally-open contact of the relay KT1, and a wire B1 of the work power supply AC1 in sequence, a main contact of the contactor KM2 is connected between a stand-by power supply AC2 and the output power supply, one end of a coil of a relay KT2 is connected to a wire A2 of the stand-by power supply AC2, the other end of the coil of the relay KT2 is connected to a wire C2 of the stand-by power supply AC2 via a normally-closed contact of the relay KT1, one end of a coil of the contactor KM2 is connected to the wire A2 of the stand-by power supply AC2, and the other end of the coil of the contactor KM2 is connected with a time-delay closing normally-open contact of the relay KT2, a normally-closed contact of the contactor KM1, and a wire B2 of the stand-by power supply AC2 in sequence.

Description

Can realize double loop power supply automatic switch-over circuit

Technical field

The utility model relates to a kind of commutation circuit, specifically, relates to one simple in structure, and the safe and reliable double loop power supply realized automatic switch-over circuit.

Background technology

In order to ensure the normal operation of electric equipment, avoid because long time electric supply failure causes equipment out of service, a lot of users prepare more than Liao Yi road power supply as for subsequent use, when Dang Yi road power supply is out of service, drops into an other road power supply and can continue to move with guarantee equipment.

At present a lot of users have adopted the method for manual switchover stand-by power supply, and making has following drawback in this way: 1) promptness is poor; 2) manual operation is cumbersome, has certain danger; 3) need personnel on duty for a long time.

Utility model content

For above deficiency, it is a kind of simple in structure that the utility model provides, and the safe and reliable double loop power supply realized automatic switch-over circuit, it comprises contactor KM1, contactor KM2, relay K T1 and relay K T2, the main contacts of described contactor KM1 is electrically connected between working power AC1 and out-put supply, the coil electric of relay K T1 is connected between the line A1 and line C1 of working power AC1, one end of the coil of contactor KM1 is electrically connected in the line A1 of working power AC1, its other end is electrically connected the normally-closed contact of contactor KM2 successively, the timing closing normally opened contact of relay K T1 and the line B1 of working power AC1, the main contacts of contactor KM2 is electrically connected between stand-by power supply AC2 and out-put supply, one end of the coil of relay K T2 is electrically connected in the line A2 of stand-by power supply AC2, its other end is electrically connected in the line C2 of stand-by power supply AC2 by the normally-closed contact of relay K T1, one end of the coil of contactor KM2 is electrically connected in the line A2 of stand-by power supply AC2, and its other end is electrically connected timing closing normally opened contact, the normally-closed contact of contactor KM1 and the line B2 of stand-by power supply AC2 of relay K T2 successively.

In order further to realize the present invention, a circuit breaker Q 1 of output electrical connection of working power AC1, a circuit breaker Q 2 of output electrical connection of stand-by power supply AC2.

In order further to realize the present invention, between the coil of described contactor KM1, the coil of relay K T1 and circuit breaker Q 1, be electrically connected fuse F1, between the coil of described contactor KM2, the coil of relay K T2 and circuit breaker Q 2, be electrically connected fuse F2.

The beneficial effects of the utility model: of the present utility model when realizing double loop power supply automatic switch-over circuit and realize operating circuit and stand-by circuit and automatically switch, can also realize overcurrent and the short-circuit protection of load; In addition, between contactor KM1 of the present utility model and contactor KM2, realize electrical interlocks; Further, the device interior that is directly installed on of the present utility model, can auto switching electric source, non-maintaining, can set switching time, can not cause electrical source exchange fault because of misoperation.

Brief description of the drawings

Fig. 1 is the circuit theory diagrams of realizing double loop power supply automatic switch-over circuit of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further elaborated.

The double loop power supply automatic switch-over circuit of realizing of the present utility model adopts A.C. contactor and the time relay to form electric logic control circuit, realize the electrical interlocks that two-way automatically switches, utilize circuit engineering to realize the handoff-security between operating circuit and stand-by circuit, in the time that operating circuit has a power failure or overhaul, out-put supply can be automatically switched on stand-by circuit.

The double loop power supply automatic switch-over circuit of realizing of the present utility model comprises contactor KM1, contactor KM2, relay K T1 and relay K T2, wherein, the main contacts of contactor KM1 is electrically connected between working power AC1 and out-put supply, and the main contacts of contactor KM1 is near out-put supply one side, the coil electric of relay K T1 is connected between the line A1 and line C1 of working power AC1, one end of the coil of contactor KM1 is electrically connected in the line A1 of working power AC1, its other end is electrically connected the normally-closed contact of contactor KM2 successively, the timing closing normally opened contact of relay K T1 and the line B1 of working power AC1, the main contacts of contactor KM2 is electrically connected between stand-by power supply AC2 and out-put supply, and the main contacts of contactor KM2 is near out-put supply one side, one end of the coil of relay K T2 is electrically connected in the line A2 of stand-by power supply AC2, its other end is electrically connected in the line C2 of stand-by power supply AC2 by the normally-closed contact of relay K T1, one end of the coil of contactor KM2 is electrically connected in the line A2 of stand-by power supply AC2, and its other end is electrically connected timing closing normally opened contact, the normally-closed contact of contactor KM1 and the line B2 of stand-by power supply AC2 of relay K T2 successively.

In addition, in order to realize overcurrent and the short-circuit protection of load, the utility model is in a circuit breaker Q 1 of output electrical connection of working power AC1, in a circuit breaker Q 2 of output electrical connection of stand-by power supply AC2; Further; in order to realize the short-circuit protection of control circuit; the utility model is also electrically connected fuse F1 between the coil of the coil of contactor KM1, relay K T1 and circuit breaker Q 1, between the coil of the coil of contactor KM2, relay K T2 and circuit breaker Q 2, is electrically connected fuse F2.

Working power AC1 and stand-by power supply AC2 are the two-way power supply that can mutually switch, circuit breaker Q 1 is the lead-in circuit breaker of working power AC1, circuit breaker Q 2 is the lead-in circuit breaker of stand-by power supply AC2, contactor KM1 is groundwork circuit A.C. contactor, contactor KM2 is the A.C. contactor of main stand-by circuit, between contactor KM1 and contactor KM2, have electrical interlocks, relay K T1 is the time relay of groundwork circuit, the time relay that relay K T2 is stand-by circuit.

The course of work that realizes double loop power supply automatic switch-over circuit of the present utility model is:

1) first set time t1, the t2 of relay K T1 and relay K T2;

2) switch of close circuit breaker Q1 and circuit breaker Q 2;

3) in the time that working power AC1 sends a telegram here, the coil of relay K T1 obtains electric, the normally-closed contact of relay K T1 disconnects, after the t1 time, the timing closing normally opened contact adhesive of relay K T1, the coil of contactor KM1 obtains electric, and the normally-closed contact of contactor KM1 disconnects, the main contacts adhesive of contactor KM1 simultaneously, working power AC1 supplying power for outside;

4), if working power AC1 and stand-by power supply AC2 send a telegram here simultaneously, because the normally-closed contact of relay K T1 and contactor KM1 is off-state, cannot make relay K T2 and contactor KM2 coil obtain electric, not supplying power for outside of stand-by power supply AC2;

5) in the time that working power AC1 has a power failure, the coil losing electricity of relay K T1 and contactor KM1, their timing closing normally opened contact and normally-closed contact reset;

6) when working power AC1 has a power failure, when stand-by power supply AC2 has electricity, the coil of relay K T2 obtains electric, after the t2 time, the timing closing normally opened contact adhesive of relay K T2, the coil of contactor KM2 obtains electric, and the normally-closed contact of contactor KM2 disconnects, the main contacts adhesive of contactor KM2 simultaneously, stand-by power supply AC2 supplying power for outside.

7) in the time that working power AC1 recovers, the coil losing electricity of relay K T2 and contactor KM2, their timing closing normally opened contact and normally-closed contact reset, and return to step 3), make the operation that circuit arrangement can be continual and steady.

In circuit, there is electrical interlocks relation due to contactor KM1 and contactor KM2, the normally-closed contact of contactor KM1 and contactor KM2 is connected with the other side's coil, in the time that the main contacts of contactor KM1 or contactor KM2 is closed, its normally-closed contact disconnects, the contactor KM1 of series connection with it or the coil of contactor KM2 can not be obtained electric, reach the function of contactor KM1 and contactor KM2 adhesive simultaneously.When working power AC1 work, stand-by power supply AC2 power supply must not put into operation, and after working power AC1 power supply quits work, stand-by power supply AC2 power supply puts into operation automatically, after the power supply of working power AC1 power up, can automatically switch to working power AC1 power supply.

The foregoing is only preferred embodiments of the present invention, the present invention is not limited to above-mentioned execution mode, in implementation process, may there is local small structural modification, if various changes of the present invention or modification are not departed to the spirit and scope of the present invention, and within belonging to claim of the present invention and equivalent technologies scope, the present invention is also intended to comprise these changes and modification.

Claims

1. can realize double loop power supply automatic switch-over circuit for one kind, it comprises contactor KM1, contactor KM2, relay K T1 and relay K T2, it is characterized in that, the main contacts of described contactor KM1 is electrically connected between working power AC1 and out-put supply, the coil electric of relay K T1 is connected between the line A1 and line C1 of working power AC1, one end of the coil of contactor KM1 is electrically connected in the line A1 of working power AC1, and its other end is electrically connected normally-closed contact, the timing closing normally opened contact of relay K T1 and the line B1 of working power AC1 of contactor KM2 successively; The main contacts of contactor KM2 is electrically connected between stand-by power supply AC2 and out-put supply, one end of the coil of relay K T2 is electrically connected in the line A2 of stand-by power supply AC2, its other end is electrically connected in the line C2 of stand-by power supply AC2 by the normally-closed contact of relay K T1, one end of the coil of contactor KM2 is electrically connected in the line A2 of stand-by power supply AC2, and its other end is electrically connected timing closing normally opened contact, the normally-closed contact of contactor KM1 and the line B2 of stand-by power supply AC2 of relay K T2 successively.

2. the double loop power supply automatic switch-over circuit of realizing according to claim 1, is characterized in that, a circuit breaker Q 1 of output electrical connection of working power AC1, a circuit breaker Q 2 of output electrical connection of stand-by power supply AC2.

3. the double loop power supply automatic switch-over circuit of realizing according to claim 1, it is characterized in that, between the coil of described contactor KM1, the coil of relay K T1 and circuit breaker Q 1, be electrically connected fuse F1, between the coil of described contactor KM2, the coil of relay K T2 and circuit breaker Q 2, be electrically connected fuse F2.