CN206378553U - A kind of public lighting circuit cable theft-prevention detection means under not electric power thus supplied - Google Patents
A kind of public lighting circuit cable theft-prevention detection means under not electric power thus supplied Download PDFInfo
- Publication number
- CN206378553U CN206378553U CN201621491304.3U CN201621491304U CN206378553U CN 206378553 U CN206378553 U CN 206378553U CN 201621491304 U CN201621491304 U CN 201621491304U CN 206378553 U CN206378553 U CN 206378553U
- Authority
- CN
- China
- Prior art keywords
- circuit
- public lighting
- lighting circuit
- direct current
- electric power
- 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 - Fee Related
Links
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
The utility model discloses the device that public lighting circuit cable theft-prevention under a kind of not electric power thus supplied is detected, it is made up of circuit starting point end and line end two parts circuit.Wherein starting point terminal circuit mainly completes the application of direct current signal, the detection of line connectivity；Terminating circuit part mainly completes automatically engaging and cutting off for end resistance.The utility model is under public lighting circuit daytime not electric power thus supplied, an end resistance is accessed between circuit terminal L, N, starting point applies direct current signal on L, N two lines road, and detection circuit is continuous or cut-off in real time, so as to accurately judge whether public lighting circuit is stolen by people's destruction, the present apparatus is simple and reliable, it is easy to implement.
Description
Technical field
The utility model is related to the device that public lighting circuit cable theft-prevention is detected under a kind of not electric power thus supplied, belongs to distribution and sets
Standby, safe antitheft technical field.
Background technology
Town road illumination is the important component of municipal communal facility.Each angle in town road illumination covering city
Fall, the safety of public lighting circuit directly affects the security of the lives and property of the public, and public lighting circuit is stolen to cause night not provide
Road Lighting Service, while security incident is also easily caused, the Public Satisfaction of influence city image and community service.
In actual applications, public lighting circuit has a very wide distribution, and has stolen situation during illuminating line, occurs road lamp line
Road is stolen, it will usually cause entire road night illumination in a period of time to work, meanwhile, the rewiring of whole piece circuit,
Construction is complicated, and construction period is also long, if the stolen situation of public lighting circuit can not be found in time, continues to give the line powering, also
The generation of electric leakage accident is easily caused, personal safety is endangered.And if using anti-theft alarm of street lamp line technology, to public lighting circuit
Monitored, once finding that public lighting circuit has stolen phenomenon, alarmed at once in real time, and public security nearby or defendance patrolman can be notified
Member, rushes for spot, the event that cable usually can be avoided stolen, prevents the loss of public property and the hair of security incident
It is raw.Under normal circumstances, cable is stolen event and relatively mostly occurred in the case where public lighting circuit is not powered, therefore, and research one kind is on road
Lamp driver seems not the cable theft-prevention technology under electric power thus supplied to be even more important.
Utility model content
Technical problem to be solved in the utility model is to overcome the defect of prior art there is provided under a kind of not electric power thus supplied
The anti-theft technique of road lighting cable, the technology can automatically engage work when public lighting circuit is stopped power supply, in real time monitoring cable quilt
Robber's situation, when finding that cable is stolen, can send signal, be detected for controller for road lamp and realize remote alarms.Meanwhile, the skill
Art ensure that when public lighting circuit recovers illuminalive power-supply, can automatically exit from operation.Because public lighting circuit belongs to outdoor equipment,
It is subject in the interference such as thunderbolt, the circuit involved by the present apparatus, has taken into full account the lightning protection capability of burglar alarm in itself,
With ensure when the overvoltage such as being struck by lightning can safe operation, be not damaged by.
The utility model provides public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied, and described device includes road
Lamp driver starting point terminal circuit and line end circuit, the public lighting circuit starting point terminal circuit are installed on the L (fire of public lighting circuit starting point
Line), between N (zero line), the line end circuit is formed by accessing an end resistance between circuit terminal L, N,
The public lighting circuit starting point terminal circuit includes direct current signal generation circuit, direct current signal switching circuit and signal detection
Circuit, the direct current signal generation circuit is used to produce low-voltage dc signal；The direct current signal switching circuit is used to complete institute
State input and excision of the low-voltage dc signal on public lighting circuit；The signal deteching circuit includes public lighting circuit detection of connectivity
Circuit and low-voltage dc signal state detection circuit；
The line end circuit is used to complete automatically engaging and cutting off for end resistance；
The tail circuit constitutes loop with the direct current signal generation circuit；
The public lighting circuit cable theft-prevention detection means accesses a direct current signal under public lighting circuit not electric power thus supplied
Loop is constituted into public lighting circuit, and by end resistance, whether is closed by loop described in line connectivity detection electric circuit inspection
Close, to determine whether that cable is stolen situation, when the circuit closed, judge that cable is stolen and sends signal, for road
Lamp controller detects and realizes remote alarms.
In one embodiment, direct current signal generation circuit is low-voltage dc signal generation circuit, by using DC/DC
Insulating power supply module is realized, is inputted as 12V, is output as 24V.
Wherein, the direct current signal switching circuit includes double-contact relay and drive circuit, the double-contact relay
Switch is cut off as the input of direct current signal, when circuit is stopped daytime, double-contact relay is under the control of the controller
Low-voltage dc signal is accessed into public lighting circuit；When evening public lighting circuit works, direct current signal is reliably cut off；The driving electricity
Road is used to amplify EXE signals and drive double-contact relay to act.
The tail circuit includes the relay of an exchange driving, and the relay of the exchange driving is used as end resistance
Input and excision switch, when circuit is stopped daytime, during AC-less power, relay automatically puts into end resistance, by road
Lamp driver live wire, zero line are connected, when circuit starts power supply on that night, supply voltage driving relay, make end resistance from line
Cut off in road.Switched using the relay of alternating current 220V coil voltage as the input and excision of end resistance.
The circuit starting point terminal circuit detects whether public lighting circuit is made up of the end resistance of circuit terminal by optocoupler
Loop.
The direct current signal that the circuit starting point terminal circuit applies is 24V, and is set between contact relay and internal circuit
Protection circuit is put, circuit is prevented in the case where running into thunderbolt, the safety of internal wiring.
The protection circuit is arranged between direct current signal generation circuit and direct current signal switching circuit, including a gas
Anti-thunder tube, two-way TVS pipe V1, two-way TVS pipe V2, two-way TVS pipe V3, thermistor RT1 and thermistor RT2 and one from
Recover fuse, wherein, the gas anti-thunder tube is connected between live wire and zero line；It is two-way TVS pipe V1, two-way TVS pipe V2, double
It is respectively arranged to TVS pipe V3 between live wire and signal ground, between zero line and live wire and between zero line and signal ground；Temperature-sensitive electricity
Resistance RT1 and thermistor RT2 is respectively arranged on live wire and zero line, for preventing surge current from entering subordinate's circuit.
Preferably, the end resistance that the circuit terminal circuit is used is 10k ohm, and power is 5W.
Preferably, the tail circuit use can recover fuse and carry out current-limiting protection, be broken down short circuit in tail circuit
In the case of can disconnect the partial circuit.Preferably, the pressure-resistant 600V of the fuse selection, rated current 160mA.
Preferably, the tail circuit configuration is used for protective relay coil by piezo-resistance, prevents outdoor thunderbolt situation
Under, overvoltage is broken relay.Preferably, piezo-resistance is rated voltage 560V.
Beneficial effect：Compared with prior art, the utility model has the following advantages that：
(1) practicality：One low-voltage dc signal is linked into road by the utility model under public lighting circuit not electric power thus supplied
In lamp driver, and loop is constituted by end resistance, by detecting whether this loop closes, to determine whether that cable is stolen
Situation occurs, simple and practical；
(2) reliability：Public lighting circuit anti-theft device of the present utility model has principle simple, the high advantage of reliability, and
And consider practical application, anti thunder strike circuit is configured with, with good interference free performance；
(3) integration：The highly integrated low-voltage dc signal generation of the utility model, the switching of direct current signal, loop connect
The functions such as general character detection are compact, easy for installation in one, and illuminating line can be met in feelings of not powering using set of device
The demand of antitheft detection under condition；
(4) Yi Shixing：The utility model has fully taken into account the original power supply installation form of lighting power supply system, actual use
When only terminus module need to be installed in line end, it is not necessary to carry out the change of distribution, be also not required in distribution box start of installation circuit
Other parts are additionally equipped with again, application is installed simple and easy to apply.
Brief description of the drawings
Fig. 1 is that public lighting circuit of the present utility model plays dot circuit, including 24V low-voltage dc signals generation circuit and low-pressure direct
Flow signal switching circuit and lightning Protection circuit (lightning protection circuit)；
Fig. 2 is that starting point public lighting circuit continuity of the present utility model detects circuit and 24V low-voltage dc signal state-detections
Circuit.
Fig. 3 is the schematic diagram of public lighting circuit tail circuit of the present utility model.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating this
The technical scheme of utility model, and protection domain of the present utility model can not be limited with this.
The utility model between circuit terminal L, N by under public lighting circuit daytime not electric power thus supplied, accessing an end
Hold resistance, starting point applies direct current signal on L, N two lines road, and in real time detection circuit be it is continuous or cut-off, from
And accurately judge whether public lighting circuit is stolen by people's destruction.
As shown in Figure 1, 2, 3, the public lighting circuit cable theft-prevention detection means under not electric power thus supplied of the present utility model is by two
Part is constituted, including public lighting circuit starting point terminal circuit and line end circuit, and public lighting circuit starting point terminal circuit is installed on road lamp line
Between L, N of road starting point, the line end circuit is formed by accessing an end resistance between circuit terminal L, N.Figure
1st, 2 be starting point terminal circuit schematic diagram, Fig. 3 be tail circuit schematic diagram.Wherein, starting point terminal circuit is believed by 24V low-voltage directs
Number generation circuit, low-voltage dc signal switching circuit, line connectivity detection circuit, 24V low-voltage dc signals state-detection electricity
Road, 24V low-voltage dc signals generation circuit and low-voltage dc signal switching circuit are parallel with one another, and to lightning Protection circuit group
Into.Tail circuit, which is mainly, completes automatically engaging and cutting off for end resistance, and when public lighting circuit is not powered, end resistance is automatic
Input, public lighting circuit L, N are connected, in order to which starting point terminal circuit is detected, when public lighting circuit is powered, switching relay
Automatically end resistance is disconnected.For completing, low-voltage dc signal is produced public lighting circuit starting point terminal circuit, low-voltage dc signal exists
The detection whether input, excision and public lighting circuit on public lighting circuit connect.
Specifically, as shown in figure 1, starting point terminal circuit 24V low-voltage dc signals generation circuit uses DC/DC isolated variable moulds
Block (power module) U1 (model WRF1224S-3WR2) is produced, and the module is by 12V voltage conversions into 24V voltages, and power is
3W.C1 and C2 is two electric capacity in parallel, is power module U1 input filter capacitor.C3, C4 are power module U1 output
Filter capacitor, for reducing output voltage ripple.R2 is 2k Ohmic resistances, is connected with power module U1, for power module
U1 provides a less dead load, it is ensured that the stabilization of power module output voltage.J1 be 24V low-voltage dc signals switching after
Electrical equipment (model HFD3-V/12), is double-contact relay, under the control for the EXE signals that controller for road lamp is exported, and enters action
Make.R5, R6, V6, V7, C5, C6, V5 constitute relay coil drive circuit, and wherein V6, V7 (model MMBT2222) is constituted and reached
Islington pipe, by the amplification driving relay coil action of EXE signals, R5 is current-limiting resistance (2k ohm of resistance), for limiting base stage
Driving current.R6 (resistance is 5.1k ohm) provides bias voltage for base stage.C5, C6 are simultaneously connected on power supply, for relay
Device coil provides instantaneous energy when connecting, and prevents supply voltage from falling.V5 is connected on J1 two ends, is carried when relay coil is closed
For afterflow, electromagnetic interference is reduced.V1-V4 and thermistor RT1, RT2 constitute lightning-prevention and surge-resistance circuit, and V4 is anti-for ceramic gas
Detonator (model B3R090L), it is connected between L, N, and operation voltage is 90V, discharge capacity 8/20uS：5KA, is the first order
Lightning protection circuit.RT1, RT2 are rated operational current 1.1A, rated voltage 33V resettable fuse (model P110TF/
33V), RT1, RT2 are respectively arranged on L and N and are arranged between J1 and U1, for preventing surge current from entering subordinate's circuit.
V1-V3 is two-way TVS pipe, when J1 is connected, V1 (breakdown reverse voltage 30V, model P6KE30CA)) connect L and signal ground
(GND) between, between V3 (breakdown reverse voltage 30V, model P6KE30CA) connection N and signal ground, V2 (breakdown reverse voltages
30V, model P6KE30CA) between connection L, N, constitute second level lightning protection circuit.Wherein, V1-V3 may be contained within J1 and U1 it
Between, YX1 is public lighting circuit detection of connectivity end, and YX2 is 24V signal conditions test side, and whether detection 24V signals are normal, R1, R4
For current-limiting resistance, the electric current for limiting YX1, YX2 makes the electric current of input Fig. 2 optocoupler U2, U3 inputs in 1mA m- 2mA,
Enable optocoupler normal work, be unlikely to again because electric current is too big and damages.
It is illustrated in figure 2 the signal detection part of circuit starting point terminal circuit.Entered by optocoupler U2, U3 (model TLP627)
Row detection, optocoupler can play a part of signal isolation, and R7, R8 are pull-up resistor, wherein, R7 is connected with YX1* ends, R8 and
YX2* ends are connected, when YX1, YX2 are low level, and optocoupler input luminous end is not worked, and output end is closed, YX1*,
YX2* exports high level under the effect of R7, R8 pull-up.RV1 and RV2 is piezo-resistance, and U2 and U3 two ends are connected on respectively and are divided
It is not in parallel with electric capacity C7 and C8, resistance capaciting absorpting circuit is constituted, surge current is can absorb, the influence of voltage pulsation is reduced；Two-way light
Coupling detects the connectedness of circuit and the state of 24V signals respectively.YX1*, YX2* are the output par, c of this circuit, for Street lamps control
Device is detected.When YX1* is low level, it is connection to represent public lighting circuit, and on the contrary then circuit is disconnected.When YX2* is low electricity
Usually, represent that 24V signals are normal, on the contrary then 24V signal possible breakdowns.
It is illustrated in figure 3 line end partial circuit of the present utility model, including end resistance, fuse F2, pressure can be recovered
Quick resistance and relay coil J2.The end resistance R3 that tail circuit is used is 10k ohm, and power is 5W.Tail circuit is used
Fuse F2 (X600-RF160) can be recovered and carry out current-limiting protection, this can be disconnected in the case where tail circuit breaks down short circuit
Partial circuit, the fuse selection is pressure-resistant 600V, rated current 160mA.Meanwhile, tail circuit is configured with piezo-resistance RV1
(14D561K) is used for protective relay coil J2 (HF115-A/230V AC-1ZS1AF), excessively electric in the case of preventing outdoor thunderbolt
Relay of breaking is pressed, the piezo-resistance is rated voltage 560V.
The utility model can automatically engage work when public lighting circuit is stopped power supply, and monitoring cable is stolen situation in real time,
When finding that cable is stolen, signal can be sent, is detected for controller for road lamp and realizes remote alarms.Meanwhile, the technology can
Ensure, when public lighting circuit recovers illuminalive power-supply, operation can be automatically exited from.Because public lighting circuit belongs to outdoor equipment, easily meet with
The interference such as it is struck by lightning, in the circuit involved by the present apparatus, the lightning protection capability of burglar alarm in itself has been taken into full account, to ensure
When the overvoltage such as being struck by lightning can safe operation, be not damaged by.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model technical principle is not departed from, some improvement and deformation can also be made, these change
Enter and deform and also should be regarded as protection domain of the present utility model.
Claims (10)
1. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied, it is characterised in that described device includes street lamp
Circuit starting point terminal circuit and line end circuit, the public lighting circuit starting point terminal circuit be installed on public lighting circuit starting point live wire,
Between zero line, the line end circuit is formed by accessing an end resistance between circuit terminal live wire, zero line,
The public lighting circuit starting point terminal circuit includes direct current signal generation circuit, direct current signal switching circuit and signal detection electricity
Road, the direct current signal generation circuit is used to produce low-voltage dc signal；The direct current signal switching circuit is used to complete described
Input and excision of the low-voltage dc signal on public lighting circuit；The signal deteching circuit includes public lighting circuit detection of connectivity electricity
Road and low-voltage dc signal state detection circuit；
The line end circuit is used to complete automatically engaging and cutting off for end resistance；
The tail circuit constitutes loop with the direct current signal generation circuit；
One direct current signal is linked into road by the public lighting circuit cable theft-prevention detection means under public lighting circuit not electric power thus supplied
In lamp driver, and loop is constituted by end resistance, whether closed, come by loop described in line connectivity detection electric circuit inspection
Determine whether that cable is stolen situation, when the circuit closed, judge that cable is stolen and sends signal, for Street lamps control
Device detects and realizes remote alarms.
2. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 1, its feature exists
It is DC/DC insulating power supply modules in, the direct current signal generation circuit, inputs as 12V, be output as 24V.
3. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 1, its feature exists
In the direct current signal switching circuit includes double-contact relay and drive circuit, and the double-contact relay is believed as direct current
Number input excision switch, when circuit is stopped daytime, double-contact relay is under the control of the controller by low-voltage direct
Signal accesses public lighting circuit；When evening public lighting circuit works, direct current signal is reliably cut off；The drive circuit is used for will
EXE signals amplify and drive double-contact relay to act.
4. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 1, its feature exists
In the public lighting circuit detection of connectivity circuit and low-voltage dc signal state detection circuit detect road lamp line by optocoupler respectively
Whether whether road constitutes loop by the end resistance of public lighting circuit terminal connects and low-voltage direct letter to judge public lighting circuit
Number whether break down.
5. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 1, its feature exists
Include the relay of an exchange driving in, the tail circuit, the relay of the exchange driving as end resistance input
With excision switch, when circuit is stopped daytime, during AC-less power, relay automatically puts into end resistance, by road lamp line
Road live wire, zero line are connected, when circuit starts power supply on that night, supply voltage driving relay, make end resistance from circuit
Excision.
6. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 2, its feature exists
In the direct current signal that the circuit starting point terminal circuit applies is 24V, and sets anti-between double-contact relay and internal circuit
Protection circuit, for preventing circuit in the case where running into thunderbolt, the safety of internal wiring.
7. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 6, its feature exists
In the protection circuit is arranged between direct current signal generation circuit and direct current signal switching circuit, including a gas lightning protection
Pipe, two-way TVS pipe V1, two-way TVS pipe V2, two-way TVS pipe V3, thermistor RT1 and thermistor RT2 and a self- recoverage
Fuse, wherein, the gas anti-thunder tube is connected between live wire and zero line；It is two-way TVS pipe V1, two-way TVS pipe V2, two-way
TVS pipe V3 is respectively arranged between live wire and signal ground, between zero line and live wire and between zero line and signal ground；Thermistor
RT1 and thermistor RT2 are respectively arranged on live wire and zero line, for preventing surge current from entering subordinate's circuit.
8. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 1, its feature exists
In the end resistance that the circuit terminal circuit is used is 10k ohm, and power is 5W.
9. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 1, its feature exists
In the tail circuit use can recover fuse and carry out current-limiting protection, can in the case where tail circuit breaks down short circuit
Disconnect the partial circuit.
10. the public lighting circuit cable theft-prevention detection means under a kind of not electric power thus supplied according to claim 1, its feature exists
In the tail circuit, which is configured with piezo-resistance, is used for protective relay coil, prevents in the case of outdoor thunderbolt, overvoltage is broken
Relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621491304.3U CN206378553U (en) | 2016-12-30 | 2016-12-30 | A kind of public lighting circuit cable theft-prevention detection means under not electric power thus supplied |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621491304.3U CN206378553U (en) | 2016-12-30 | 2016-12-30 | A kind of public lighting circuit cable theft-prevention detection means under not electric power thus supplied |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206378553U true CN206378553U (en) | 2017-08-04 |
Family
ID=59403300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621491304.3U Expired - Fee Related CN206378553U (en) | 2016-12-30 | 2016-12-30 | A kind of public lighting circuit cable theft-prevention detection means under not electric power thus supplied |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206378553U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526407A (en) * | 2016-12-30 | 2017-03-22 | 南京南瑞集团公司节能环保分公司 | Street lamp line cable antitheft detection device under power-off condition |
| CN108152648A (en) * | 2017-12-19 | 2018-06-12 | 四川九洲电器集团有限责任公司 | It is a kind of to have electricity and without the cable disconnecting warning device under electric situation |
-
2016
- 2016-12-30 CN CN201621491304.3U patent/CN206378553U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526407A (en) * | 2016-12-30 | 2017-03-22 | 南京南瑞集团公司节能环保分公司 | Street lamp line cable antitheft detection device under power-off condition |
| CN108152648A (en) * | 2017-12-19 | 2018-06-12 | 四川九洲电器集团有限责任公司 | It is a kind of to have electricity and without the cable disconnecting warning device under electric situation |
| CN108152648B (en) * | 2017-12-19 | 2020-04-07 | 四川九洲电器集团有限责任公司 | Cable disconnection alarm device under power on and power off conditions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20150130475A1 (en) | Street light cable anti-theft system | |
| CN206378553U (en) | A kind of public lighting circuit cable theft-prevention detection means under not electric power thus supplied | |
| CN101853558B (en) | Cable burglar alarm wireless monitoring system | |
| CN203511454U (en) | Rapid-replacing type electric vehicle and battery box unlocking alarm system thereof | |
| CN209402148U (en) | A kind of short-circuit protection circuit and device of automobile power supply system | |
| CN205640616U (en) | City wisdom lighting control system | |
| CN201230196Y (en) | Apparatus for monitoring working state of fuse | |
| CN108150301A (en) | One kind is stopped in emergency circuit and its implementation | |
| CN102213738A (en) | Short-circuit test device of electric equipment | |
| CN106526407A (en) | Street lamp line cable antitheft detection device under power-off condition | |
| CN203623501U (en) | Automobile daytime running lamp control device | |
| CN204615349U (en) | Remote signalling alarm device when a kind of integrated form Surge Protector Indication of Losing Efficacy and inefficacy | |
| CN209329674U (en) | A kind of traffic lights earth leakage protective device | |
| CN201540616U (en) | Anti-theft alarm wireless monitoring system of cable | |
| CN202423047U (en) | Intelligent device for preventing false switching of electric appliance switch | |
| CN204066208U (en) | A kind of motor cable anti-theft device | |
| CN219499594U (en) | Electric leakage monitoring and protecting system for street lamp post | |
| CN108131208A (en) | One kind is stopped in emergency circuit and its implementation | |
| CN109449879A (en) | A kind of traffic lights earth leakage protective device and its method | |
| CN104426145A (en) | Inverse connection prevention circuit and lamp | |
| CN108590867A (en) | One kind is stopped in emergency circuit and its implementation | |
| CN107910949A (en) | One kind is stopped in emergency circuit and its implementation | |
| CN202425123U (en) | Economical anti-surge maloperation-preventing street-light single-lamp control switch output circuit | |
| CN209708262U (en) | A kind of anti-theft alarm for cable | |
| CN1514523A (en) | Electric equipment safety device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170804 Termination date: 20211230 |