CN2678115Y - Compound power electronic switch - Google Patents
Compound power electronic switch Download PDFInfo
- Publication number
- CN2678115Y CN2678115Y CN 200420018458 CN200420018458U CN2678115Y CN 2678115 Y CN2678115 Y CN 2678115Y CN 200420018458 CN200420018458 CN 200420018458 CN 200420018458 U CN200420018458 U CN 200420018458U CN 2678115 Y CN2678115 Y CN 2678115Y
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- CN
- China
- Prior art keywords
- circuit
- relay
- controllable silicon
- power
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a compound power electronic switch, comprising a casing, an optical coupling isolation circuit for a major loop, a major loop circuit, a triggering control circuit for controlled silicon, a delay circuit, a polarity inversion return circuit, a working drive circuit for a magnetic latching relay, a power down protective circuit, a control signal input circuit, an optical coupling isolation circuit, a system power circuit and a lack phase protective circuit. Based on the technology of an electronic arc-control device, the utility model connects with a large power magnet holding relay in parallel, and when a combination switch is thrown-in or cut out, the controlled silicon is conducted prior to the relay and is disconnected later than the relay. During normal work, the conduction of the major loop current is finished by the relay; the control circuit is simple and practical and eliminates the surge current produced by switching off the relay effectively; and simultaneously, the control circuit puts an end to the electric arc and protects the contact and extends the service life of the equipment as well as solves the problems of the power loss and on-state pressure drop of the controlled silicon of the contactless switch, so the utility model is a novel technology that combines the two switch technologies.
Description
Affiliated technical field
The utility model relates to a kind of combined type electronic power switch, collection noncontacting switch and electromagnetic relay are the compound electrical switchgear of one, because controllable silicon is made alternating-current switch and can be eliminated contact electric arc effectively, so combination switch is particularly suitable for the occasion of frequent starting, belong to the low voltage electrical apparatus technology field.
Background technology
At present, known low-voltage electrical apparatus Switch product majority is electromagnetic relay and A.C. contactor etc., these switches closed, and disconnected moment easily between the contact, produce electric arc, decrease the ring contact and cause equipment fault and accident such as fire, problem is particularly outstanding in the electric equipment of frequent movement.Development along with power electronic technology, the controllable silicon of Chu Xianing is made contactless arc extinguishing ac switch in recent years, the problem that can solve the electrical arc erosion contact as our company's patented product " electronic arc-control device " (patent No. is EL01201907.0) effectively prolongs equipment life, the generation of stopping accident.But the on-state voltage drop during because of the controllable silicon conducting can produce the certain power loss, and still there is certain problem in long-time running.
The utility model has made marked progress with the patented technology " a kind of low-voltage composite switch " (patent No. is EL02239247.5) of having authorized, adopts photoelectricity to isolate between silicon controlled trigger signal and the major loop; And " low-voltage composite switch " do not adopt this technology; Relay adopts power magnetic force keeping relay, controls by the polar form conversion; And " low-voltage composite switch " use is common relay; Silicon controlled triggers control and adopts simple and practical delay circuit, and " low-voltage composite switch " adopts singlechip technology, and control circuit is quite complicated.
Summary of the invention
In order to overcome the deficiency of above-mentioned electronic arc-control device patented technology, the utility model has adopted on the basis of electronic arc-control device technology, power magnetic force keeping relay in parallel again; When combined type electronic power switch input or when cutting out, controllable silicon disconnects and lag behind relay prior to the relay conducting.The admittance of main circuit current is finished by relay during normal operating conditions, so the power loss that can avoid the controllable silicon on-state voltage drop to produce.
The utility model solves the scheme that its technical problem takes: it is made up of housing, phase voltage input wires terminal R, S, T, the sub-U of phase voltage output connection, V, W, major loop plate, control board, controllable silicon plate, major loop optical coupling buffer circuit, main loop circuit, controllable silicon trigger control circuit, delay circuit, polar switching loop, magnetic latching relay task driven circuit, power down protection circuit, control signal input circuit, optical coupling buffer circuit, system power supply circuit, open-phase protection circuit etc., is cuboid; In housing, divide upper, middle and lower-ranking that wiring board is housed, the controllable silicon plate is equipped with in lower floor, the major loop plate is equipped with in the middle level, and the Ai on the major loop plate, Bi, Ci binding post meet phase voltage input terminal R, S, T, and L1, L2, L3 binding post meet phase voltage output wiring terminal U, V, W; + ,-binding post connect DC power supply+,-binding post; Control board is equipped with on the upper strata, and the Ai on the TB1 of control board, Bi, Ci binding post meet phase voltage input terminal R, S, T, and A, K meet the sub-N of ac power supply terminal, L.
Main loop circuit is by controllable silicon SCR
1, SCR
2, power magnetic force keeping relay CJ
1, resistance R
41-R
45And diode D
11, D
12, suppress inductance L and constitute, controllable silicon is made contactless alternating-current switch and power magnetic force keeping relay is connected in parallel, switch input or when cutting out, controllable silicon disconnects and lag behind power magnetic force keeping relay prior to the power magnetic force keeping relay conducting; Normal work period is by the conducting of power magnetic force keeping relay holding circuit.The output of input termination power down protection circuit, the input of output termination major loop optical coupling buffer circuit; Major loop optical coupling buffer circuit is by optical coupler U
2, U
3Constitute input termination controllable silicon trigger control circuit output PM+ and PM-, output termination main loop circuit; The control signal input circuit is made up of AC and DC switching signal two-way, and the alternating-current switch signal input circuit is by rectifier diode D
1-D
4Form full-bridge, through voltage stabilizing didoe DW1 and filtering resistor-capacitor unit C
1, C
2, R
2-R
4Constitute A, K 2 points of the TB1 on the output termination control board, the optical coupler U of output termination optical coupling isolation circuit
IAThe dc switch signal is by triode T
1, T
2Resistance R
0, R
1Form constant-current source circuit, the T on the input termination control board
B1DC power supply+,-binding post, the optical coupler U of output termination optical coupling buffer circuit
IBThe optical coupling buffer circuit is by optical coupler U
IB, U
IAConstitute, the buffer circuit between the control circuit that triggers for control signal input circuit and delay circuit, controllable silicon, the output of input termination control signal input circuit is exported termination controllable silicon trigger control circuit input C
OnThe controllable silicon trigger control circuit is by the comparator ic chip
1And resistance R
6-R
14, R
19-R
23, capacitor C
3-C
6, C
13, the monostable ic chip
2And resistance R
15-R
18, capacitor C
7-C
12Form pulsed triggering circuit, diode D
5, D
6, triode T
3, resistance R
26, R
27Form to trigger and promote circuit, formation controllable silicon trigger control circuit, output and open-phase protection circuit output BH and optical coupling buffer circuit output C
0nBe connected, output is connected with major loop optical coupling buffer circuit output; Polarity switching is by triode T
4, relay J
2, resistance R
24, R
25Diode D
14, LED
1Etc. formation, input is connected with the delay circuit output with the system power supply circuit, and output is connected with magnetic latching relay task driven circuit input end; Magnetic latching relay task driven circuit is by triode T
5, T
6Constitute, input is connected with the polarity switching output, the power magnetic force keeping relay CJ of output and main loop circuit
1Be connected; Delay circuit is by resistance R
19, capacitor C
14Constitute, control and controlledly be connected with optical coupling buffer circuit output with the switching input of power magnetic force keeping relay, output is connected with controllable silicon trigger control circuit input with polarity switching; The power down protection circuit is by diode D
00, D
9, relay J
1, capacitor C
15Constitute, input is connected with the system power supply circuit output end, and the power magnetic force keeping relay of output and main loop circuit is at CJ
1Be connected; The system power supply circuit is by transformer TF1, diode D
10-D
13Form full-bridge, capacitor C
16-C
19And regulator block IC
3Constitute, input is by elementary Ai, the Bi binding post of connecing of transformer TF1, and output is respectively each part circuit D.C. regulated power supply is provided; Open-phase protection circuit is by transformer TF
2, TF
3, diode D
15-D
18And D
19-D
22Form two full-bridges, divider resistance R respectively
31, R
32And adjustable resistance VR
1, VR
2And operational amplifier ic chip
4, IC
5, diode D
7, D
8Resistance R
28, R
33-R
35Constitute, elementary Ai, Bi, the Ci binding post of connecing respectively of input transformer TF2, TF3, output meets the comparator IC of controllable silicon trigger control circuit by the BH binding post
1AInput.
The beneficial effects of the utility model are: fully adopt the contactless alternating-current switch of electronic arc-control device can eliminate electric arc and dedicated magnetic latching relay contact contact resistance is minimum, the advantage that reliability is high; Control circuit is simple and practical, and has functions such as open-phase protection, under-voltage protection, power down protection; It can effectively be eliminated relay and turn-off the surge current that produces, and stops electric arc, the protection contact; prolonging equipment life, solved the shortcoming that noncontacting switch exists controllable silicon on-state voltage drop and power loss again, is two kinds of switching techniques of a kind of collection are the whole body; have complementary advantages the new technique that shortcoming is supported mutually.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the utility model combined type electronic power switch left side stereogram.
Fig. 2 is a right perspective view.
Fig. 3 is the internal structure schematic diagram
Fig. 4 is a controllable silicon panel element distribution map.
Fig. 5 is a major loop panel element distribution map.
Fig. 6 is a control board element distribution map.
Fig. 7 is the auxiliary circuit schematic diagram.
Fig. 8 is the main loop circuit schematic diagram.
Fig. 9 is a circuit block diagram.
Number in the figure
1, housing 2, input terminal R
3, input terminal S 4, input terminal T
5, lead-out terminal U 6, lead-out terminal V
7, lead-out terminal W 8, DC power supply+binding post
9, DC power supply-binding post 10, AC power N binding post
11, AC power L binding post 12, major loop plate
13, control board 14, controllable silicon plate
15, Ai binding post 16, Bi binding post
17, Ci binding post 18, L1 binding post
19, L2 binding post 20, L3 binding post
21, control signal input circuit 22, optical coupling buffer circuit
23, system power supply circuit 24, open-phase protection circuit
25, main loop circuit 26, major loop optical coupling buffer circuit
27, controllable silicon trigger control circuit 28, delay circuit
29, polarity switching 30, magnetic latching relay task driven circuit
31, power down protection circuit
Embodiment
See also Fig. 1 to Fig. 9, it is by housing (1), phase voltage input wires terminal R (2), S (3), T (4), phase voltage output wiring terminal U (5), V (6), W (7), major loop plate (12), control board (13), controllable silicon plate (14), major loop optical coupling buffer circuit (26), main loop circuit (25), controllable silicon trigger control circuit (27), delay circuit (28), polarity switching (29), magnetic latching relay task driven circuit (30), power down protection circuit (31), control signal input circuit (21), optical coupling buffer circuit (22), system power supply circuit (23), open-phase protection circuit formations such as (24) is cuboid; In housing (1), divide upper, middle and lower-ranking that wiring board is housed, controllable silicon plate (14) is equipped with in lower floor, major loop plate (12) is equipped with in the middle level, Ai binding post (15) on the major loop plate (12), meet phase voltage input terminal R (2), Bi binding post (16) meets phase voltage input terminal S (3), Ci binding post (17) meets phase voltage input terminal T (4), L1 binding post (18) meets phase voltage lead-out terminal U (5), L2 binding post (19) meets phase voltage lead-out terminal V (6), and L3 binding post (20) meets phase voltage lead-out terminal W (7); + ,-connect DC power supply+binding post (8) and DC power supply-binding post (9); Control board (13) is equipped with on the upper strata, and the Ai binding post (15) of the TB1 on the control board (13) meets phase voltage input terminal R (2), and Bi binding post (16) meets phase voltage input terminal S (3), and Ci binding post (17) meets phase voltage input terminal T (4); A connects AC power N binding post (10), and K connects AC power L binding post (11).Main loop circuit (25) is by controllable silicon SCK
1, SCK
2, power magnetic force keeping relay CJ
1, resistance R
41-R
45And diode D
11, D
12, suppress inductance L and constitute; The output Cj+ and the Cj-of input termination power down protection circuit (31), the input of output termination major loop optical coupling buffer circuit (26), wherein SCR
1And SCR
2Reverse parallel connection is simultaneously with power magnetic force keeping relay Cj
1In parallel; Major loop optical coupling buffer circuit (26) is by optical coupler U
2, U
3Constitute the PM+ and the PM-of the input controlled trigger control circuit of termination (27) output, output termination main loop circuit (25); Control signal input circuit (21) is formed the alternating-current switch signal input circuit by rectifier diode D by AC and DC switching signal two-way
1-D
4Form full-bridge, through voltage stabilizing didoe DW1 and filtering resistor-capacitor unit C
1, C
2, R
2-R
4Constitute; A, K 2 points of TB1 on the input termination control board (13), the optical coupler U of output termination optical coupling buffer circuit (22)
IAThe dc switch signal is by triode T
1, T
2, resistance R
0, R
1Form constant-current source circuit; DC power supply+binding post (8) and DC power supply one binding post (9) of TB1 on the input termination control board (13); The optical coupler U of output termination optical coupling buffer circuit (22)
IBOptical coupling buffer circuit (22) is by optical coupler U
IB, U
IAConstitute the output of input termination control signal input circuit (21), output termination controllable silicon trigger control circuit (27) input C
ORControllable silicon trigger control circuit (27) is by the comparator ic chip
1And resistance R
6-R
14, R
19-R
23Capacitor C
3-C
6, C
13, the monostable ic chip
2And resistance R
15-R
18, capacitor C
7-C
12Form pulsed triggering circuit, diode D
5, D
6, triode T
3, resistance R
26, R
27Form to trigger and promote circuit, formation controllable silicon trigger control circuit (27), input and open-phase protection circuit (24) output BH and optical coupling buffer circuit (22) output C
ONBe connected, output is connected with major loop optical coupling buffer circuit (26) input.Polarity switching (29) is by triode T
4, relay J
2, resistance R
24, R
25, diode D
10, LED
1Etc. formation, output is connected with delay circuit (28) output with system power supply circuit (23), and output is connected with magnetic latching relay task driven circuit (30) input; Magnetic latching relay task driven circuit (30) is by triode T
5, T
6Constitute, input is connected the power magnetic force keeping relay CJ of output and main loop circuit (25) with polarity switching (29) output
1Be connected; Delay circuit (28) is by resistance R
19, capacitor C
14Constitute, input is connected with optical coupling buffer circuit (22) output, and output is connected with controllable silicon trigger control circuit (27) output with polarity switching (29); Power down protection circuit (31) is by diode D
00, D
9, relay J
1, capacitor C
15Constitute, input is connected the power magnetic force keeping relay CJ of output and main loop circuit (25) with system power supply circuit (23) output
1Be connected; System power supply circuit (23) is by transformer TF1, diode D
10-D
13Form full-bridge, capacitor C
16-C
19And regulator block IC
3Constitute, input is by elementary Ai binding post (15) and the Bi binding post (16) of connecing of transformer TF1; Output is respectively the each several part circuit provides D.C. regulated power supply open-phase protection circuit (24) by transformer TF2, TF3, diode D
15-D
18And D
19-D
22Form two full-bridges, divider resistance R respectively
31, R
32And adjustable resistance VR
1, VR
2And operational amplifier ic chip
4, IC
5, diode D
7, D
8, resistance R
28, R
33-R
35Constitute, elementary Ai binding post (15), Bi binding post (16), the Ci binding post (17) of connecing respectively of input transformer TF2, TF3, output meets the comparator IC of controllable silicon trigger control circuit (27) by the BH binding post
1AInput.
When this combined type electronic power switch close a floodgate to use, at first insert high level and open signal by TB1, wherein AC signal is inserted by N, L terminal, direct current signal by+,-terminal inserts.The optical coupler U of optical coupling buffer circuit (22)
1Export high level signal to R
9Enter comparator circuit IC
1AIC
1ATwo-way output is arranged, and one road high level is through R
11Arrive inverter ic
1BAnother road is given to emitter follower IC
IC, IC
ICThis high level signal output is driven triode T
4, make relay J
2Conducting, and the power magnetic force keeping relay CJ of drive main loop circuit (25)
1, make CJ
IFinish polar switching, treat conducting work.Because of inverter ic
1BOutput opposite levels signal is so be given to monostable circuit IC
2ABe a low level negative pulse, so IC
2AWith trigger impulse that width is 110ms of output, and by triode T
3Drive, arrive the optical coupler input (PM) of major loop optical coupling buffer circuit (26), U
2, U
3Make controllable silicon SCR
1, SCR
2Conducting.The monostable undersuing is through T
3Also output to simultaneously delay circuit (28) R
19-C
14, about 40-60ms that delays time, and through comparator IC
IDExport a high level, by Darlington T
5, T
6Driving is through relay J
2Contact arrives power magnetic force keeping relay CJ by terminal (CJ)
1, make CJ
1Adhesive, main loop circuit (25) are at this moment by controllable silicon and relay conducting simultaneously.Because of CJ
1Conducting, the controllable silicon two ends are by short circuit, controllable silicon turn-offs immediately, main loop circuit (25) conducting is independently carried out by relay.
When the utility model turn-offs use, by TB
1Insert low-level cut-off signals, through the optical coupler U of optical coupling buffer circuit (22)
1This low level is outputed to comparator IC
1A, IC
IAExport a undersuing through emitter follower IC
ICOutput, the one tunnel through C
9Arrive monostable circuit IC
2BAnother road is through R
25Arrive triode T
4, drive relay J
2Work is because of J
2The switching of contact makes CJ
1Realize polar switching.IC
1ANegative pulse arrive monostable circuit IC
2BAfter, IC
2BExport the trigger impulse that width is 110ms, and through triode T
3Drive, arrive major loop optical coupling buffer circuit (26) input (PM), U
2, U
3Trigger impulse is made controllable silicon SCR with isolation method
1, SCR
2Conducting.Main loop circuit (25) enters controllable silicon and relay while conducting state once more.Drive triode T
3Pulse signal from another road through delay circuit (28) R
19-C
14, the 40-60ms that delays time approximately arrives comparator IC
ID, and export a high level promotion multiple tube T
5, T
6Conducting is through relay J
2Make power magnetic force keeping relay CJ
1Disconnect.At CJ
1Pass about 50-70ms that has no progeny, controllable silicon also turn-offs because of current over-zero.Whole main loop circuit this moment (25) turn-offs.
By above-mentioned implementation process as can be known, when the combined type electronic power switch was closed, controllable silicon was prior to the relay conducting, and during shutoff, controllable silicon lags behind relay again and turn-offs, and has avoided the generation of surge current, can not produce electric arc between relay contact; And the normal work period of main loop circuit (25) beyond dropping into or cutting out, electric current is still finished by relay contact, do not have the power consumption and the heat dissipation problem that cause because of the controllable silicon forward voltage drop, the life-span that makes whole combined type electronic power switch is near its mechanical endurance.
By isolating transformer TF
2, TF
3, rectification full-bridge D
15-D
22, divider resistance R
29-R
32And VR
1, VR
2, operational amplifier IC
4, IC
5The open-phase protection circuit of forming (24), phase shortage and serious under voltage fault to three-phase electricity occurs all can provide a low level signal by open-phase protection circuit (24), make the main loop circuit (25) can not closure, or transfer off state immediately to from closure state.
When the power down of whole system accident, by D
00, relay J
1, capacitor C
15And triode T
4, relay J
2All because of power down disconnects, main loop circuit (25) transfers off-state to from conducting state immediately and realizes power down protection.
Claims (1)
1, a kind of combined type electronic power switch, it is made up of housing, phase voltage input wires terminal R, S, T, phase voltage output wiring terminal U, V, W, major loop plate, control board, controllable silicon plate, major loop optical coupling buffer circuit, main loop circuit, controllable silicon trigger control circuit, delay circuit, polar switching loop, magnetic latching relay task driven circuit, power down protection circuit, control signal input circuit, optical coupling buffer circuit, system power supply circuit, open-phase protection circuit etc., is cuboid; It is characterized in that: main loop circuit (25) is by controllable silicon SCR
1, SCR
2, power magnetic force keeping relay CJ
1, resistance R
41-R
45And diode D
11, D
12, suppress inductance L and constitute, controllable silicon is made contactless alternating-current switch and power magnetic force keeping relay is connected in parallel, switch input or when cutting out, controllable silicon disconnects and lag behind power magnetic force keeping relay prior to the power magnetic force keeping relay conducting; Normal work period is by the conducting of power magnetic force keeping relay holding circuit; Delay circuit (28) is by resistance R
19, capacitor C
14Constitute the switching of control controllable silicon and power magnetic force keeping relay; Major loop optical coupling buffer circuit (26) is by optical coupler U
1, U
2Constitute, for the buffer circuit optical coupling buffer circuit (22) between controllable silicon and the triggering signal by coupler U
IB, U
IAConstitute, be the buffer circuit between control signal input circuit (21) and delay circuit (28), the controllable silicon trigger control circuit (27); Open-phase protection circuit is by transformer TF2, TF3 diode D
15-D
18And D
19-D
22Form two full-bridges, divider resistance R respectively
31, R
32And adjustable resistance VR
1, VR
2And operational amplifier ic chip
4, IC
5, diode D
7, D
8, resistance R
28, R
33-R
35Constitute; Elementary Ai binding post (15), Bi binding post (16), the Ci binding post (17) of connecing respectively of input transformer TF2, TF3, output meets the comparator IC of controllable silicon trigger control circuit (27) by the BH binding post
1AInput.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420018458 CN2678115Y (en) | 2004-02-17 | 2004-02-17 | Compound power electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420018458 CN2678115Y (en) | 2004-02-17 | 2004-02-17 | Compound power electronic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2678115Y true CN2678115Y (en) | 2005-02-09 |
Family
ID=34583121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420018458 Expired - Lifetime CN2678115Y (en) | 2004-02-17 | 2004-02-17 | Compound power electronic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2678115Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630829B (en) * | 2009-08-12 | 2011-07-27 | 国电南京自动化股份有限公司 | Strong electric switching value input module with requirement on power |
| CN103278795A (en) * | 2013-05-28 | 2013-09-04 | 南京五耀电子科技有限公司 | Secondary metering pressure drop eliminating device |
| CN103701447A (en) * | 2013-12-23 | 2014-04-02 | 活点信息技术有限公司 | Novel circuit control switch |
| CN104426150A (en) * | 2013-08-26 | 2015-03-18 | 深圳市华冠电气有限公司 | Single-phase heavy-current compound switch and control method thereof |
| CN104426150B (en) * | 2013-08-26 | 2016-11-30 | 深圳市华冠电气有限公司 | Single-phase big electric current combination switch and control method thereof |
| CN108398971A (en) * | 2018-03-02 | 2018-08-14 | 常州汇邦电子有限公司 | Temperature control all-in-one machine and its working method |
| CN111937110A (en) * | 2018-01-31 | 2020-11-13 | 通用电器技术有限公司 | Switching device |
-
2004
- 2004-02-17 CN CN 200420018458 patent/CN2678115Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630829B (en) * | 2009-08-12 | 2011-07-27 | 国电南京自动化股份有限公司 | Strong electric switching value input module with requirement on power |
| CN103278795A (en) * | 2013-05-28 | 2013-09-04 | 南京五耀电子科技有限公司 | Secondary metering pressure drop eliminating device |
| CN103278795B (en) * | 2013-05-28 | 2016-04-06 | 黄文忠 | Secondary measurement pressure drop cancellation element |
| CN104426150A (en) * | 2013-08-26 | 2015-03-18 | 深圳市华冠电气有限公司 | Single-phase heavy-current compound switch and control method thereof |
| CN104426150B (en) * | 2013-08-26 | 2016-11-30 | 深圳市华冠电气有限公司 | Single-phase big electric current combination switch and control method thereof |
| CN103701447A (en) * | 2013-12-23 | 2014-04-02 | 活点信息技术有限公司 | Novel circuit control switch |
| CN111937110A (en) * | 2018-01-31 | 2020-11-13 | 通用电器技术有限公司 | Switching device |
| CN111937110B (en) * | 2018-01-31 | 2023-03-10 | 通用电器技术有限公司 | Switching device |
| CN108398971A (en) * | 2018-03-02 | 2018-08-14 | 常州汇邦电子有限公司 | Temperature control all-in-one machine and its working method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140217 Granted publication date: 20050209 |