CN104079060A - Three-way power source switchover circuit and method - Google Patents

Three-way power source switchover circuit and method Download PDF

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Publication number
CN104079060A
CN104079060A CN201410290352.5A CN201410290352A CN104079060A CN 104079060 A CN104079060 A CN 104079060A CN 201410290352 A CN201410290352 A CN 201410290352A CN 104079060 A CN104079060 A CN 104079060A
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contactor
normally
input terminal
power
closed contact
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CN201410290352.5A
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CN104079060B (en
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魏华
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Guangdong East Power Co Ltd
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Guangdong East Power Co Ltd
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Abstract

The invention relates to the technical field of multi-way power source supply, and particularly discloses a three-way power source switchover circuit and method. The three-way power source switchover circuit comprises a first input terminal, a second input terminal, a third input terminal, a first alternating current contactor, a second alternating current contactor and a power supply module, wherein the first input terminal is connected with a coil of the first alternating current contactor and a normally open contact, the normally open contact is connected with the power supply module, the second input terminal is connected with a first normally closed contact and a second normally closed contact of the first alternating current contactor, the second normally closed contact is connected with the power supply module through a normally open contact of the second contactor, the third input terminal is connected with a third normally closed contact of the first alternating current contactor, a normally closed contact of the second alternating current contactor is connected with the power supply module, and switching over of a power source is achieved through the switching on or off of the contactors in the power-on or power-off process of the input terminals. The three-way power source switchover circuit and method can achieve automatic switching over of three phases of power, and is simple in circuit structure, low in cost and high in reliability.

Description

Three-way power commutation circuit and three-way power changing method
Technical field
The present invention relates to multiple power supplies power supply technique field, particularly a kind of three-way power commutation circuit and three-way power changing method.
Background technology
In the industrial system of three phase supply, what most of control power module adopted is all single phase power supply, and as single phase poaer supply disappearance, power module is by power-off.There are at present some companies to adopt technological means to realize the switching of three-way power, for example Chinese utility model patent 201320483007.4, be to comprise the first branch road and the second branch road being electrically connected to two-way independent current source, also comprise the 3rd branch road being electrically connected to generator, described three
The middle part of branch road is provided with the contactor by controller control action, in the input section of described three branch roads, the measurement module being electrically connected to controller input is installed, and the deferent segment of described three branch roads is connected in parallel by copper bar.In the input section of described three branch roads, input circuit breaker is installed.By operation, input circuit breaker, can control the break-make of three branch road input sections, when breaking down, can, by manual intervention mode force disconnect power circuit, guarantee power supply reliability like this.Although this commutation circuit has realized the switching of power supply, circuit is complicated, and cost is high, need to manually operate and could realize.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of three-way power commutation circuit, and it can guarantee that, as long as any one does not lack in three-phase electricity, power module all can power-off, and circuit is simple, and cost is low, automation mechanized operation.
The present invention also provides a kind of three-way power changing method.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of three-way power commutation circuit, it comprises first input end, the second input terminal, the 3rd input terminal, the first A.C. contactor KM1, the second A.C. contactor KM2 and supply module, the first A.C. contactor KM1 has normally opened contact KM1-NO-1 and the first normally-closed contact KM1-NC-1, the second normally-closed contact KM1-NC-2 and the 3rd normally-closed contact KM1-NC-3, and the second A.C. contactor KM2 has normally-closed contact KM2-NC-1 and normally opened contact KM2-NO-1; First input end is connected with coil one end of the first A.C. contactor KM1 and normally opened contact KM1-NO-1 one end of the first A.C. contactor KM1, the coil other end of the first A.C. contactor KM1 is connected with the N line of input power, and the normally opened contact KM1-NO-1 other end of the first A.C. contactor KM1 is connected with supply module; The second input terminal is connected with the first normally-closed contact KM1-NC-1 of the first A.C. contactor KM1, one end of the second normally-closed contact KM1-NC-2 respectively, the first normally-closed contact KM1-NC-1 other end connects coil one end of the second A.C. contactor KM2, the other end of the coil of the second A.C. contactor KM2 connects the N line of input power, the other end of the second normally-closed contact KM1-NC-2 of the first A.C. contactor KM1 connects the normally opened contact KM2-NO-1 of the second A.C. contactor KM2, and the normally opened contact KM2-NO-1 of the second A.C. contactor KM2 is connected with supply module; The 3rd input terminal connects the 3rd normally-closed contact KM1-NC-3 of the first A.C. contactor KM1, the 3rd normally-closed contact KM1-NC-3 other end connects one end of the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2, and the other end of the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2 is connected with supply module.
Preferably, described supply module is power pack.
The method that three-way power switches, it comprises described three-way power commutation circuit; When first input end has electricity, the coil electricity of the first A.C. contactor KM1, first input end is powered to supply module by the normally opened contact KM1-NO-1 of the first A.C. contactor KM1, all closed contacts of the first A.C. contactor KM1 disconnect, and the second input terminal and the 3rd input terminal are not powered; During the sub-power down of first input end, the coil no power of the first A.C. contactor KM1: if the second input terminal and the 3rd input terminal all have electricity, the coil electricity of the second A.C. contactor KM2, the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2 disconnects, the 3rd input terminal is not powered, and the second input terminal is powered to supply module by the second normally-closed contact KM1-NC-2 of the first A.C. contactor KM1 and the normally opened contact KM2-NO-1 of the second A.C. contactor KM2; If the also power down of the second input terminal, the 3rd input terminal is communicated with supply module by the 3rd normally-closed contact KM1-NC-3 of the first A.C. contactor KM1, the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2, is supply module power supply.
Preferably, the priority of described first input end, the second input terminal and the power supply of the 3rd input terminal is that first input end is preferential, and secondly, the 3rd input terminal is last for the second input terminal.
Three-way power commutation circuit of the present invention and three-way power changing method, its beneficial effect is:
Utilize two contactors with Chang Kai and normally-closed contact, realize the automation conversion of three-phase electricity, guarantee can power when any one in three-phase electricity does not lack, improved the reliability of electricity consumption.Whole circuit only needs two contactors to realize, and circuit structure is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of embodiment of the present invention three-way power commutation circuit.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment:
Please refer to Fig. 1, three-way power commutation circuit of the present invention, it comprises the sub-terminal1 of first input end, the second input terminal terminal2, the 3rd input terminal terminal3, the first A.C. contactor KM1, the second A.C. contactor KM2 and supply module power module.Wherein, the first A.C. contactor KM1 has normally opened contact KM1-NO-1 and the first normally-closed contact KM1-NC-1, the second normally-closed contact KM1-NC-2 and the 3rd normally-closed contact KM1-NC-3, and the second A.C. contactor KM2 has normally-closed contact KM2-NC-1 and normally opened contact KM2-NO-1.Normally opened contact disconnects when corresponding A.C. contactor no power, closed during energising; Normally-closed contact is closed when corresponding A.C. contactor no power, during energising, disconnects.Supply module power module is power pack.
Circuit theory is: the sub-terminal1 of first input end is connected with one end of one end of the coil of the first A.C. contactor KM1 and the normally opened contact KM1-NO-1 of the first A.C. contactor KM1, the other end of the coil of the first A.C. contactor KM1 is connected with the N line of input power, and the normally opened contact KM1-NO-1 other end of the first A.C. contactor KM1 is connected with supply module power module.The second input terminal terminal2 respectively with the first normally-closed contact KM1-NC-1 of the first A.C. contactor KM1, one end of the second normally-closed contact KM1-NC-2 connects, the other end of the first normally-closed contact KM1-NC-1 of the first A.C. contactor KM1 connects coil one end of the second A.C. contactor KM2, the other end of the coil of the second A.C. contactor KM2 connects the N line of input power, the other end of the second normally-closed contact KM1-NC-2 of the first A.C. contactor KM1 connects normally opened contact KM2-NO-1 one end of the second A.C. contactor KM2, the normally opened contact KM2-NO-1 other end of the second A.C. contactor KM2 connects supply module power module.The 3rd input terminal terminal3 connects the 3rd normally-closed contact KM1-NC-3 of the first A.C. contactor KM1, the 3rd normally-closed contact KM1-NC-3 other end of the first A.C. contactor KM1 connects one end of the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2, and the other end of the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2 connects supply module power module.
Utilize the method that above-mentioned three-way power commutation circuit is switched three-way power to be: when the sub-terminal1 of first input end has electricity, the coil electricity of the first A.C. contactor KM1, the sub-terminal1 of first input end is communicated with supply module power module by the normally opened contact KM1-NO-1 of the first A.C. contactor KM1, gives supply module power module power supply.All normally-closed contacts of the first A.C. contactor KM1 disconnect, circuit between the second input terminal terminal2 and supply module power module, the 3rd input terminal terminal3 and supply module power module disconnects, and the second input terminal terminal2 and the 3rd input terminal terminal3 all do not power.
During the sub-terminal1 power down of first input end, the coil no power of the first A.C. contactor KM1: if the second input terminal terminal2 and the 3rd input terminal terminal3 all have electricity, the coil electricity of the second A.C. contactor KM2, the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2 disconnects, the circuit of the 3rd input terminal terminal3 and supply module power module is disconnected, the 3rd input terminal terminal3 does not power, the second input terminal terminal2 powers to supply module power module by the second normally-closed contact KM1-NC-2 of the first A.C. contactor KM1 and the normally opened contact KM2-NO-1 of the second A.C. contactor KM2, if the second also power down of input terminal terminal2, the 3rd input terminal terminal3 is communicated with supply module power module by the 3rd normally-closed contact KM1-NC-3 of the first A.C. contactor KM1, the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2, and the 3rd input terminal terminal3 is supply module power module power supply.Realize thus the switching of three-way power, guarantee can power when a not power down of input.
The priority of the sub-terminal1 of above-mentioned first input end, the second input terminal terminal2 and the 3rd input terminal terminal3 power supply is that the sub-terminal1 of first input end is preferential, secondly, the 3rd input terminal terminal3 is last for the second input terminal terminal2.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.

Claims (4)

1. a three-way power commutation circuit, it is characterized in that: comprise first input end, the second input terminal, the 3rd input terminal, the first A.C. contactor KM1, the second A.C. contactor KM2 and supply module, the first A.C. contactor KM1 has normally opened contact KM1-NO-1 and the first normally-closed contact KM1-NC-1, the second normally-closed contact KM1-NC-2 and the 3rd normally-closed contact KM1-NC-3, and the second A.C. contactor KM2 has normally-closed contact KM2-NC-1 and normally opened contact KM2-NO-1;
First input end is connected with coil one end of the first A.C. contactor KM1 and normally opened contact KM1-NO-1 one end of the first A.C. contactor KM1, the coil other end of the first A.C. contactor KM1 is connected with the N line of input power, and the normally opened contact KM1-NO-1 other end of the first A.C. contactor KM1 is connected with supply module;
The second input terminal is connected with the first normally-closed contact KM1-NC-1 of the first A.C. contactor KM1, one end of the second normally-closed contact KM1-NC-2 respectively, the first normally-closed contact KM1-NC-1 other end connects coil one end of the second A.C. contactor KM2, the other end of the coil of the second A.C. contactor KM2 connects the N line of input power, the other end of the second normally-closed contact KM1-NC-2 of the first A.C. contactor KM1 connects the normally opened contact KM2-NO-1 of the second A.C. contactor KM2, the normally opened contact KM2-NO-1 of the second A.C. contactor KM2
Be connected with supply module;
The 3rd input terminal connects the 3rd normally-closed contact KM1-NC-3 of the first A.C. contactor KM1, the 3rd normally-closed contact KM1-NC-3 other end connects one end of the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2, and the other end of the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2 is connected with supply module.
2. three-way power commutation circuit according to claim 1, is characterized in that: described supply module is power pack.
3. the method that three-way power switches, is characterized in that, comprises three-way power commutation circuit claimed in claim 1;
When first input end has electricity, the coil electricity of the first A.C. contactor KM1, first input end is powered to supply module by the normally opened contact KM1-NO-1 of the first A.C. contactor KM1, all closed contacts of the first A.C. contactor KM1 disconnect, and the second input terminal and the 3rd input terminal are not powered;
During the sub-power down of first input end, the coil no power of the first A.C. contactor KM1: if the second input terminal and the 3rd input terminal all have electricity, the coil electricity of the second A.C. contactor KM2, the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2 disconnects, the 3rd input terminal is not powered, and the second input terminal is powered to supply module by the second normally-closed contact KM1-NC-2 of the first A.C. contactor KM1 and the normally opened contact KM2-NO-1 of the second A.C. contactor KM2; If the also power down of the second input terminal, the 3rd input terminal is communicated with supply module by the 3rd normally-closed contact KM1-NC-3 of the first A.C. contactor KM1, the normally-closed contact KM2-NC-1 of the second A.C. contactor KM2, is supply module power supply.
4. the method that three-way power switches according to claim 3, it is characterized in that: the priority of described first input end, the second input terminal and the power supply of the 3rd input terminal is that first input end is preferential, secondly, the 3rd input terminal is last for the second input terminal.
CN201410290352.5A 2014-06-24 2014-06-24 Three-way power source switchover circuit and method Active CN104079060B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104377812A (en) * 2014-11-28 2015-02-25 青岛歌尔声学科技有限公司 Switching circuit for multiple input power sources
CN108736480A (en) * 2017-04-25 2018-11-02 中国电力科学研究院 A kind of multichannel AC looped network type energy router
CN110429705A (en) * 2019-08-29 2019-11-08 强文 A kind of integrated type electrical information interactive device of included UPS

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201528221U (en) * 2009-09-10 2010-07-14 安徽方兴科技股份有限公司 Three-path power automatic-switching circuit for improving service life of EPS system
CN201639354U (en) * 2010-03-05 2010-11-17 江苏捷诚车载电子信息工程有限公司 Power supply switching circuit
CN201910663U (en) * 2010-12-29 2011-07-27 天津市研翔电子科技有限公司 Three-power automatic switching control device
CN203368030U (en) * 2013-08-08 2013-12-25 国网山东省电力公司潍坊供电公司 Switching device of three branches of power supply

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201528221U (en) * 2009-09-10 2010-07-14 安徽方兴科技股份有限公司 Three-path power automatic-switching circuit for improving service life of EPS system
CN201639354U (en) * 2010-03-05 2010-11-17 江苏捷诚车载电子信息工程有限公司 Power supply switching circuit
CN201910663U (en) * 2010-12-29 2011-07-27 天津市研翔电子科技有限公司 Three-power automatic switching control device
CN203368030U (en) * 2013-08-08 2013-12-25 国网山东省电力公司潍坊供电公司 Switching device of three branches of power supply

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104377812A (en) * 2014-11-28 2015-02-25 青岛歌尔声学科技有限公司 Switching circuit for multiple input power sources
CN108736480A (en) * 2017-04-25 2018-11-02 中国电力科学研究院 A kind of multichannel AC looped network type energy router
CN110429705A (en) * 2019-08-29 2019-11-08 强文 A kind of integrated type electrical information interactive device of included UPS

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