CN104283313A - Far-end alternating-current distribution control circuit for transmission control device and control method thereof - Google Patents

Far-end alternating-current distribution control circuit for transmission control device and control method thereof Download PDF

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Publication number
CN104283313A
CN104283313A CN201410531331.8A CN201410531331A CN104283313A CN 104283313 A CN104283313 A CN 104283313A CN 201410531331 A CN201410531331 A CN 201410531331A CN 104283313 A CN104283313 A CN 104283313A
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signal output
equipment
normally opened
contact
opened contact
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CN104283313B (en
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王晓晖
陈纲
龚俊宇
纪浩
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No 41 Institute Of Fourth Academy China Aerospace Science & Industry Corp
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No 41 Institute Of Fourth Academy China Aerospace Science & Industry Corp
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Abstract

The invention provides a far-end alternating-current distribution control circuit for a transmission control device and a control method of the far-end alternating-current power distribution control circuit for the transmission control device. Two momentary push button switches are applied in the circuit, the electricity utilization for work of coils of two electromagnetic relays is controlled through certain access design, contacts of the two electromagnetic relays control output of alternating-current signals, and therefore a rear end worker can press down or restore the two momentary push button switches alternately to control the alternating-current distribution of the transmission control front-end device to switch on and off. The operating method is simple, power distribution control signals are accurate and reliable, the alternating-current distribution control over the front-end device can be accurately completed, and the operation executing safety can be guaranteed.

Description

A kind of far-end AC distribution control circuit for launching control equipment and control method thereof
Technical field
The invention belongs to emission control technical field, be specifically related to a kind of far-end AC distribution control circuit for launching control equipment and control method thereof.
Background technology
In emission control field, due to the restriction of some external condition, the input voltage of launching control equipment is AC signal, by the two times transfer of internal circuit, for each components and parts of device interior, functional module provide the electricity consumption of the direct current needed for work.Generally, the interchange that can be carried out control appliance by the AC distribution switch on launching control equipment panel is powered on, power-off.
In the technical literature " test of missile launching control system " that Yuhang Publishing House announces, Testing and emission system basic composition principles illustrated is mentioned: work electricity consumption is supplied to distribution transfer box by ground power supply, after its conversion, be supplied to measurand.
Although more design method demonstrates certain feasibility through model test, there is following problem:
Along with developing rapidly of electronic technology, techniques intensity and the function of missile equipment increase day by day, the fail safe of consideration personnel when operating, generally, launching control equipment can carry out layout according to the distributed form in front and back, namely operating personnel are in distance headend equipment about hundred meters of rear ends far away, carry out remote-control operation to headend equipment.In this case, consider the real-time sending out control operation, too much setting aside some time can not be had to supply operating personnel to be to and from front and back ends in time, carry out AC distribution control operation and status checkout; If carry out interchange to launching control equipment too early to power on, the state of front end launching control equipment is not controlled, easily brings beyond thought problem yet.
Therefore, the far-end AC distribution control circuit adapting to following control techniques development need be furtherd investigate.
Summary of the invention
In view of this, the present invention proposes a kind of far-end AC distribution control circuit for launching control equipment, this circuit is used for launching control equipment, can send far-end distribution control signal accurately, reliably, both accurately can complete and the AC distribution of headend equipment had been controlled, and can ensure again to operate the fail safe performed.
For achieving the above object, technical scheme of the present invention is, launching control equipment is divided into headend equipment and rear end equipment, and this circuit is divided into headend equipment circuit and rear end equipment circuit, and headend equipment circuit comprises electromagnetic relay K 1with electromagnetic relay K 2, an AC/DC power module and the 2nd AC/DC power module; Rear end equipment circuit comprises LED light L 1, current-limiting resistance R, Instant-on push-button switch S K 1with Instant-on push-button switch S K 2.
Electromagnetic relay K 1there is line bag B 1, normally opened contact K 1-1and corresponding common port COM 1-1, normally opened contact K 1-2and corresponding common port COM 1-2, and normally opened contact K 1-3and corresponding common port COM 1-3.Electromagnetic relay K 2there is line bag B 2, normally-closed contact K 2-1and corresponding common port COM 2-1.
One AC/DC power module has two inputs, the first positive voltage signal output and the first negative voltage signal output; 2nd AC/DC power module has two inputs, the second positive voltage signal output and the second negative voltage signal output.
Instant-on push-button switch S K 1there is normally opened contact SK 1-1and corresponding common port COM s1-1; Instant-on push-button switch S K 2there is normally opened contact SK 2-1and corresponding common port COM s2-1.
The annexation of rear end equipment circuit is: common port COM s1-1with common port COM s2-1connect, current-limiting resistance R one end connects LED light L 1; Rear end equipment circuit is integrated in the rear end equipment of launching control equipment, and by five external contact B in rear end equipment 1, B 2, B 3, B 4and B 5external connection: normally opened contact SK 1-1with external contact B 1connect; Normally opened contact SK 2-1with external contact B 2connect; Common port COM s1-1with external contact B 3connect; The other end of current-limiting resistance R and external contact B 4connect; LED light L 1the other end and external contact B 5connect.
The annexation of headend equipment circuit is: line bag B 1one end connects normally opened contact K 1-3, the other end and normally-closed contact K 2-1connect; Common port COM 2-1with the first positive voltage signal output and line bag B 2one end connect; Common port COM 1-3be connected with the first negative voltage signal output; Normally opened contact K 1-1with normally opened contact K 1-2connect two inputs of the 2nd AC/DC power module respectively; Common port COM 1-1with common port COM 1-2connect two inputs of an AC/DC power module respectively; Common port COM 1-1be connected with the first AC signal input, normally opened contact K 1-1be connected with the first AC signal output; Common port COM 1-2be connected with the second AC signal input, normally opened contact K 1-2be connected with the second AC signal output.Headend equipment circuit is integrated in the headend equipment of launching control equipment, and by five external contact F in headend equipment 1, F 2, F 3, F 4and F 5external connection: normally opened contact K 1-3with external contact F 1connect; Line bag B 2the other end and external contact F 2connect; Common port COM 1-3with external contact F 3connect; Second positive voltage signal output and external contact F 4connect; Second negative voltage signal output and external contact F 5connect.
Headend equipment and rear end equipment annexation as follows: the external contact B of rear end equipment 1~ B 5with the external contact F of headend equipment 1~ F 5be corresponding in turn to connection, 220V AC signal is introduced from headend equipment first AC signal input and the second AC signal input.
Further, the external contact B of rear end equipment 1~ B 5with the external contact F of headend equipment 1~ F 5interconnect cable is adopted to be corresponding in turn to connection.
Invention also provides a kind of far-end AC distribution control method for launching control equipment, avoid the drawback that manual operation cannot control in real time, and distribution control signal accurately, reliably, operation performs safety.
The method adopts circuit as claimed in claim 1 to carry out AC distribution control to launching control equipment, and it comprises the steps:
S1, press Instant-on push-button switch S K 1, its normally opened contact SK 1-1closed, by the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact SK 1-1to the first negative voltage signal output, form the first supply access, line bag B 1obtain work electricity consumption, normally opened contact K 1-1~ K 1-3closed; By the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact K 1-3to the first negative voltage signal output, form the second supply access, self-insurance maintains line bag B 1work electricity consumption.
220V AC signal is exported by the first AC signal output and the second AC signal output; LED light L in rear end equipment 1brighten, instruction headend equipment exchanges and powers on successfully.
S2, by Instant-on push-button switch S K 1return to normal, the second supply access keeps on-state constant, thus maintains the interchange power-up state of headend equipment.
S3, press Instant-on push-button switch S K 2, normally opened contact SK 2-1closed, by the first positive voltage signal output warp bag B 2, normally opened contact SK 2-1to the first negative voltage signal output, form the 3rd supply access, line bag B 2obtain work electricity consumption, then normally-closed contact K 2-1disconnect, the second supply access disconnects, line bag B 1to lose the job electricity consumption, normally opened contact K 1-1and K 1-2disconnect, the first AC signal output and the second AC signal output export without AC signal; LED light L in rear end equipment 1extinguish, the success of instruction headend equipment AC dump.
S4, by Instant-on push-button switch S K 2return to normal, it is constant that the second supply access remains open state, and headend equipment keeps AC dump state constant.
Beneficial effect:
(1), circuit provided by the present invention can according to work schedule in time for launching control equipment provides interchange electricity consumption input, and rear end staff only needs manipulation Instant-on push-button switch S K 1and SK 2form AC distribution control signal, by front and back end devices interconnect cable, export headend equipment related circuit to, Alternating Current Power Supply and the power-off of its internal communication output port can be controlled, distribution control signal is accurate, reliable, both accurately can complete and control the AC distribution of headend equipment, can ensure again to operate the fail safe performed.
(2), circuit application Instant-on push-button switch provided by the present invention is as the performer of the normally opened contact State Transferring of control electromagnetic relay, adopt the electromagnetic relay comprising many group contacts as the path control part of AC distribution simultaneously, can not only guarantee that AC signal is supplied to/disconnects the internal circuit of front end launching control equipment accurately and efficiently, also can ensure at any time, AC distribution controls to be had and only has one (on-off is opened) state effectively to export.
(3), this circuit is simple and reliable, control without time delay, only carries out accurate output/disconnection that one-level control just can complete AC signal.
(4), front and back end of the present invention equipment can adopt cable interconnect, therefore when front and back end equipment is apart from each other, can realize rear end equipment equally and control the AC distribution of headend equipment, reaches the object that far-end controls AC distribution.
(5), the invention provides a kind of method adopting foregoing circuit to carry out the control of far-end AC distribution, the method is alternately pressed by two Instant-on push-button switches or is recovered, switching on and off the Alternating Current Power Supply of launching control equipment can be realized, simple to operate, and only carry out accurate output/disconnection that one-level controls just can complete AC signal, control without time delay, when front and back end equipment is distant, also accurately, reliably can realize AC distribution to control, and operation performs safety.
Accompanying drawing explanation
Fig. 1 is a kind of far-end AC distribution control circuit principle schematic for launching control equipment.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
Embodiment 1,
Present embodiments provide a kind of far-end AC distribution control circuit for launching control equipment, launching control equipment is divided into headend equipment and rear end equipment, this circuit as shown in Figure 1, be divided into headend equipment circuit and rear end equipment circuit, wherein headend equipment circuit is integrated in headend equipment, and rear end equipment circuit is integrated in rear end equipment.
Headend equipment circuit comprises electromagnetic relay K 1with electromagnetic relay K 2, an AC/DC power module and the 2nd AC/DC power module; Rear end equipment circuit comprises LED light L 1, current-limiting resistance R, Instant-on push-button switch S K 1with Instant-on push-button switch S K 2; In the present embodiment, 1PST (¢ 16) the type Instant-on push-button switch of DECA company selected by Instant-on push-button switch, the JQX-117M of Guizhou Space Electric Co., Ltd selected by electromagnetic relay, current-limiting resistance selects the 3K Ω metalfilmresistor (power 0.25W) of Beijing 718 You Sheng Electronics Co., Ltd., LED light selects the two pin-type LED of T-1, and two groups of AC/DC power modules all select the 4NIC-Q1074 of Chaoyang power supply company.
Electromagnetic relay K 1there is line bag B 1, normally opened contact K 1-1and corresponding common port COM 1-1, normally opened contact K 1-2and corresponding common port COM 1-2, and normally opened contact K 1-3and corresponding common port COM 1-3.
Electromagnetic relay K 2there is line bag B 2, normally-closed contact K 2-1and corresponding common port COM 2-1.
One AC/DC power module has two inputs, the first positive voltage signal output and the first negative voltage signal output.
2nd AC/DC power module has two inputs, the second positive voltage signal output and the second negative voltage signal output.
Instant-on push-button switch S K 1there is normally opened contact SK 1-1and corresponding common port COM s1-1; Instant-on push-button switch S K 2there is normally opened contact SK 2-1and corresponding common port COM s2-1.
The annexation of rear end equipment circuit is: common port COM s1-1with common port COM s2-1connect, current-limiting resistance R one end connects LED light L 1.
Be integrated in the rear end equipment of launching control equipment by rear end equipment circuit, wherein rear end equipment has multiple external contact, and rear end equipment circuit is by five external contact B wherein 1, B 2, B 3, B 4and B 5external connection: normally opened contact SK 1-1with external contact B 1connect; Normally opened contact SK 2-1with external contact B 2connect; Common port COM s1-1with external contact B 3connect; The other end of current-limiting resistance R and external contact B 4connect; LED light L 1the other end and external contact B 5connect.
The annexation of headend equipment circuit is: line bag B 1one end connects normally opened contact K 1-3, the other end and normally-closed contact K 2-1connect; Common port COM 2-1with the first positive voltage signal output and line bag B 2one end connect; Common port COM 1-3be connected with the first negative voltage signal output; Normally opened contact K 1-1with normally opened contact K 1-2connect two inputs of the 2nd AC/DC power module respectively; Common port COM 1-1with common port COM 1-2connect two inputs of an AC/DC power module respectively.
Common port COM 1-1be connected with the first AC signal input, normally opened contact K 1-1be connected with the first AC signal output.
Common port COM 1-2be connected with the second AC signal input, normally opened contact K 1-2be connected with the second AC signal output.
Be integrated in the headend equipment of launching control equipment by headend equipment circuit, wherein headend equipment has multiple external contact, and headend equipment circuit is by five external contact F wherein 1, F 2, F 3, F 4and F 5external connection: normally opened contact K 1-3with external contact F 1connect; Line bag B 2the other end and external contact F 2connect; Common port COM 1-3with external contact F 3connect; Second positive voltage signal output and external contact F 4connect; Second negative voltage signal output and external contact F 5connect;
Headend equipment and rear end equipment annexation as follows: the external contact B of rear end equipment 1~ B 5with the external contact F of headend equipment 1~ F 5be corresponding in turn to connection, 220V AC signal is introduced from headend equipment first AC signal input and the second AC signal input.
The circuit that the present embodiment provides adopts Instant-on push-button switch S K 1, SK 2to electromagnetic relay K 1, K 2work electricity consumption carry out path control;
When pressing Instant-on push-button switch S K 1time, normally opened contact SK 1-1closed, by the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact SK 1-1to the first negative voltage signal output, form the first supply access, line bag B 1obtain work electricity consumption, normally opened contact K 1-1~ K 1-3closed; By the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact K 1-3to the first negative voltage signal output, form the second supply access, self-insurance maintains line bag B 1work electricity consumption.
As Instant-on push-button switch S K 1when returning to normal, the second supply access keeps on-state constant.
When pressing Instant-on push-button switch S K 2time, by the first positive voltage signal output warp bag B 2, normally opened contact SK 2-1to the first negative voltage signal output, form the 3rd supply access, line bag B 2obtain work electricity consumption, normally-closed contact K 2-1disconnect, the second supply access disconnects.
As Instant-on push-button switch S K 2when returning to normal, it is constant that the second supply access remains open state.
Embodiment 2,
Present embodiments provide a kind of power distribution control method of the circuit based on above-described embodiment 1, be mainly used in carrying out AC distribution to launching control equipment, the method adopts following steps to carry out AC distribution control to launching control equipment:
S1, press Instant-on push-button switch S K 1, its normally opened contact SK 1-1closed, by the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact SK 1-1to the first negative voltage signal output, form the first supply access, line bag B 1obtain work electricity consumption, normally opened contact K 1-1~ K 1-3closed; By the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact K 1-3to the first negative voltage signal output, form the second supply access, self-insurance maintains line bag B 1work electricity consumption.
220V AC signal is exported by the first AC signal output and the second AC signal output; LED light L in rear end equipment 1brighten, instruction headend equipment exchanges and powers on successfully.
S2, by Instant-on push-button switch S K 1return to normal, the second supply access keeps on-state constant, thus maintains the interchange power-up state of headend equipment.
S3, press Instant-on push-button switch S K 2, normally opened contact SK 2-1closed, by the first positive voltage signal output warp bag B 2, normally opened contact SK 2-1to the first negative voltage signal output, form the 3rd supply access, line bag B 2obtain work electricity consumption, then normally-closed contact K 2-1disconnect, the second supply access disconnects, line bag B 1to lose the job electricity consumption, normally opened contact K 1-1and K 1-2disconnect, the first AC signal output and the second AC signal output export without AC signal; LED light L in rear end equipment 1extinguish, the success of instruction headend equipment AC dump.
S4, by Instant-on push-button switch S K 2return to normal, it is constant that the second supply access remains open state, and headend equipment keeps AC dump state constant.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. for a far-end AC distribution control circuit for launching control equipment, described launching control equipment is divided into headend equipment and rear end equipment, it is characterized in that, this circuit is divided into headend equipment circuit and rear end equipment circuit, and described headend equipment circuit comprises electromagnetic relay K 1with electromagnetic relay K 2, an AC/DC power module and the 2nd AC/DC power module; Described rear end equipment circuit comprises LED light L 1, current-limiting resistance R, Instant-on push-button switch S K 1with Instant-on push-button switch S K 2;
Described electromagnetic relay K 1there is line bag B 1, normally opened contact K 1-1and corresponding common port COM 1-1, normally opened contact K 1-2and corresponding common port COM 1-2, and normally opened contact K 1-3and corresponding common port COM 1-3;
Described electromagnetic relay K 2there is line bag B 2, normally-closed contact K 2-1and corresponding common port COM 2-1;
A described AC/DC power module has two inputs, the first positive voltage signal output and the first negative voltage signal output;
Described 2nd AC/DC power module has two inputs, the second positive voltage signal output and the second negative voltage signal output;
Described Instant-on push-button switch S K 1there is normally opened contact SK 1-1and corresponding common port COM s1-1;
Described Instant-on push-button switch S K 2there is normally opened contact SK 2-1and corresponding common port COM s2-1;
The annexation of rear end equipment circuit is: described common port COM s1-1with common port COM s2-1connect, described current-limiting resistance R one end connects LED light L 1;
Described rear end equipment circuit is integrated in the rear end equipment of launching control equipment, and by five external contact B in rear end equipment 1, B 2, B 3, B 4and B 5external connection: normally opened contact SK 1-1with external contact B 1connect; Normally opened contact SK 2-1with external contact B 2connect; Common port COM s1-1with external contact B 3connect; The other end of described current-limiting resistance R and external contact B 4connect; Described LED light L 1the other end and external contact B 5connect;
The annexation of headend equipment circuit is: described line bag B 1one end connects normally opened contact K 1-3, the other end and normally-closed contact K 2-1connect; Common port COM 2-1with the first positive voltage signal output and line bag B 2one end connect; Common port COM 1-3be connected with the first negative voltage signal output; Normally opened contact K 1-1with normally opened contact K 1-2connect two inputs of the 2nd AC/DC power module respectively; Common port COM 1-1with common port COM 1-2connect two inputs of an AC/DC power module respectively;
Common port COM 1-1be connected with the first AC signal input, normally opened contact K 1-1be connected with the first AC signal output;
Common port COM 1-2be connected with the second AC signal input, normally opened contact K 1-2be connected with the second AC signal output;
Described headend equipment circuit is integrated in the headend equipment of described launching control equipment, and by five external contact F in headend equipment 1, F 2, F 3, F 4and F 5external connection: normally opened contact K 1-3with external contact F 1connect; Line bag B 2the other end and external contact F 2connect; Common port COM 1-3with external contact F 3connect; Second positive voltage signal output and external contact F 4connect; Second negative voltage signal output and external contact F 5connect;
Headend equipment and rear end equipment annexation as follows: the external contact B of rear end equipment 1~ B 5with the external contact F of headend equipment 1~ F 5be corresponding in turn to connection, 220V AC signal is introduced from headend equipment first AC signal input and the second AC signal input.
2. a kind of far-end AC distribution control circuit for launching control equipment as claimed in claim 1, is characterized in that, the external contact B of described rear end equipment 1~ B 5with the external contact F of headend equipment 1~ F 5interconnect cable is adopted to be corresponding in turn to connection.
3. for a far-end AC distribution control method for launching control equipment, it is characterized in that, the method adopts circuit as claimed in claim 1 to carry out AC distribution control to launching control equipment, and the method comprises the steps:
S1, press Instant-on push-button switch S K 1, its normally opened contact SK 1-1closed, by the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact SK 1-1to the first negative voltage signal output, form the first supply access, line bag B 1obtain work electricity consumption, normally opened contact K 1-1~ K 1-3closed; By the first positive voltage signal output through normally-closed contact K 2-1, line bag B 1, normally opened contact K 1-3to the first negative voltage signal output, form the second supply access, self-insurance maintains line bag B 1work electricity consumption;
220V AC signal is exported by the first AC signal output and the second AC signal output; LED light L in rear end equipment 1brighten, instruction headend equipment exchanges and powers on successfully;
S2, by Instant-on push-button switch S K 1return to normal, the second supply access keeps on-state constant, thus maintains the interchange power-up state of headend equipment;
S3, press Instant-on push-button switch S K 2, normally opened contact SK 2-1closed, by the first positive voltage signal output warp bag B 2, normally opened contact SK 2-1to the first negative voltage signal output, form the 3rd supply access, line bag B 2obtain work electricity consumption, then normally-closed contact K 2-1disconnect, described second supply access disconnects, line bag B 1to lose the job electricity consumption, normally opened contact K 1-1and K 1-2disconnect, the first AC signal output and the second AC signal output export without AC signal; LED light L in rear end equipment 1extinguish, the success of instruction headend equipment AC dump;
S4, by Instant-on push-button switch S K 2return to normal, it is constant that described second supply access remains open state, and headend equipment keeps AC dump state constant.
CN201410531331.8A 2014-10-10 2014-10-10 A kind of far-end for launching control equipment exchange power distribution control circuit and control method thereof Active CN104283313B (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN105305595A (en) * 2015-12-01 2016-02-03 中国航天科技集团公司第四研究院第四十一研究所 Power distribution self holding circuit applied to missile-borne equipment
CN106338951A (en) * 2016-10-26 2017-01-18 国网浙江永嘉县供电公司 Control circuit of online oil filtering machine of SYJZZ type on-load switch
CN106941251A (en) * 2016-01-05 2017-07-11 西安航天动力技术研究所 A kind of initial firing current observation circuit for launching control equipment
CN108061655A (en) * 2017-12-29 2018-05-22 南京磁谷科技有限公司 A kind of automatically controlled system of independent magnetic suspension bearing and its control method

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CN201584821U (en) * 2009-12-24 2010-09-15 北京航天自动控制研究所 Controlled circuit of negative bus of power supply of priming system
CN102891482A (en) * 2011-07-22 2013-01-23 中兴保全股份有限公司 AC power supply control device
CN203301231U (en) * 2013-05-10 2013-11-20 北京宇航系统工程研究所 Distributor with functions of large power switch and control signal delay

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201584821U (en) * 2009-12-24 2010-09-15 北京航天自动控制研究所 Controlled circuit of negative bus of power supply of priming system
CN102891482A (en) * 2011-07-22 2013-01-23 中兴保全股份有限公司 AC power supply control device
CN203301231U (en) * 2013-05-10 2013-11-20 北京宇航系统工程研究所 Distributor with functions of large power switch and control signal delay

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105305595A (en) * 2015-12-01 2016-02-03 中国航天科技集团公司第四研究院第四十一研究所 Power distribution self holding circuit applied to missile-borne equipment
CN106941251A (en) * 2016-01-05 2017-07-11 西安航天动力技术研究所 A kind of initial firing current observation circuit for launching control equipment
CN106338951A (en) * 2016-10-26 2017-01-18 国网浙江永嘉县供电公司 Control circuit of online oil filtering machine of SYJZZ type on-load switch
CN108061655A (en) * 2017-12-29 2018-05-22 南京磁谷科技有限公司 A kind of automatically controlled system of independent magnetic suspension bearing and its control method

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