CN209029908U - Lightning protection device fail-safe circuit and headlamp - Google Patents
Lightning protection device fail-safe circuit and headlamp Download PDFInfo
- Publication number
- CN209029908U CN209029908U CN201821890237.1U CN201821890237U CN209029908U CN 209029908 U CN209029908 U CN 209029908U CN 201821890237 U CN201821890237 U CN 201821890237U CN 209029908 U CN209029908 U CN 209029908U
- Authority
- CN
- China
- Prior art keywords
- inductance
- protection device
- lightning protection
- magnetic field
- control module
- 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.)
- Active
Links
Landscapes
- Protection Of Static Devices (AREA)
Abstract
A kind of lightning protection device fail-safe circuit and headlamp characterized by comprising control module, magnetic field sensor, inductance L1 and switch module；The control module is connect with the magnetic field sensor and the switch module, the switch module and inductance L1 is used for and load in series, the magnetic field size of inductance L1 is detected by magnetic field sensor, magnetic field size is converted into corresponding current signal, current signal is reached control module by magnetic field sensor, and when the current signal that control module detects is greater than preset reference value, control module issues control signal, the disconnection of control switch module makes to load power loss；Due to the magnetic field of lightning protection device fail-safe circuit energy real-time detection inductance L1; therefore when load short circuits; it can cut off the power in time; avoid load short circuits overlong time cause to load it is on fire; and even if when the lightning protection device failure of load; lightning protection device fail-safe circuit can also work normally, thus preferably protection load.
Description
Technical field
The utility model relates to protect field of circuit technology more particularly to a kind of lightning protection device fail-safe circuit and illumination
Lamp.
Background technique
With the development of electronic technology, some electrical equipments, such as LED street lamp, in order to improve the use longevity of electrical equipment
Life, enhances the interference performance in its anti-external world, it will usually lightning protection device is installed in the front end of electrical equipment, it is anti-outer to improve equipment with this
The ability of boundary's thunder and lightning environment, but lightning protection device is installed on electrical equipment, protecting effect is also limited, for example, lightning protection device
After failure, electrical equipment easily short-circuit fire.After lightning protection device failure in order to solve electrical equipment, protection electrical equipment is remained to,
People the mode of lightning protection device front end installation insurance silk or thermistor further would generally protect equipment again, but in practical application
In, one end time after partial electric equipment is on fire, fuse and thermistor just shield, cannot thoroughly protect and electrically set
It is standby.
Utility model content
Based on this, it is necessary to provide a kind of lightning protection device fail-safe circuit and device.
A kind of lightning protection device fail-safe circuit, comprising: control module, magnetic field sensor, inductance L1 and switch module.
The control module is connect with the magnetic field sensor and the switch module, the switch module and the electricity
Sense L1 is used for and load in series, and the magnetic field sensor is used to detect the magnetic field of the inductance L1, and the control module is used for root
The switch module is controlled according to the magnetic field of the inductance L1, so that the switch module disconnects.
The magnetic field sensor is Hall element, the Hall element and the control mould in one of the embodiments,
Block connection, the Hall element are used to detect the magnetic field of the inductance L1.
The lightning protection device fail-safe circuit further includes the first TVS pipe and the second TVS pipe in one of the embodiments,
The first end of first TVS pipe is connect with the first pin of the Hall element, the second end difference of first TVS pipe
It is connect with the first end of the second pin of the Hall element and second TVS pipe, the second end of second TVS pipe and institute
State the third pin connection of Hall element.
The switch module includes driving inductance and switch unit in one of the embodiments, the driving inductance and
The control module connection, the switch unit and the inductance L1 are used to be used for the load in series, the driving inductance
The switch unit is driven to disconnect.
The switch unit is snap switch in one of the embodiments, and the snap switch and the inductance L1 are used
In with the load in series, the driving inductance is for driving the snap switch to disconnect.
The switch module is relay in one of the embodiments, and the relay includes coil and switching group, institute
It states coil to connect with the control module, the switching group and inductance L1 is used for and load in series.
The lightning protection device fail-safe circuit further includes battery module in one of the embodiments, the battery module
It is connect with the control module.
The lightning protection device fail-safe circuit further includes solar panel in one of the embodiments, the sun
Energy solar panel is connect with the control module.
The lightning protection device fail-safe circuit further includes indicator light and resistance R1 in one of the embodiments, described to open
Module is closed also to connect with the indicator light and the resistance R1.
A kind of lightning protection device fail safe headlamp, including headlamp, lightning protection device and any of the above-described as described in the examples anti-
Thunder device fail-safe circuit, the switch module and the inductance L1 connect with the headlamp, the headlamp also with it is described
Lightning protection device connection.
Above-mentioned lightning protection device fail-safe circuit detects the magnetic field size of inductance L1 by magnetic field sensor, and magnetic field is big
Small to be converted to corresponding current signal, current signal is reached control module by magnetic field sensor, and control module is by corresponding electric current
Signal is compared with preset reference value, and when the current signal detected is greater than preset reference value, control module is issued
Signal is controlled, the disconnection of control switch module makes to load power loss；Due to lightning protection device fail-safe circuit energy real-time detection inductance L1
Magnetic field can cut off the power in time therefore when load short circuits, avoid load short circuits overlong time cause to load it is on fire, and
Even if lightning protection device fail-safe circuit can also work normally when the lightning protection device failure of load, thus preferably protection load.
Detailed description of the invention
Fig. 1 is the functional block diagram of lightning protection device fail-safe circuit in one embodiment；
Fig. 2 is the circuit diagram of lightning protection device fail-safe circuit in one embodiment；
Fig. 3 is the circuit diagram of lightning protection device fail-safe circuit in another embodiment；
Fig. 4 is the circuit diagram of lightning protection device fail safe headlamp in one embodiment.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Term used herein is intended merely to description specific embodiment
Purpose, it is not intended that in limitation the utility model.
For example, a kind of lightning protection device fail-safe circuit, comprising: control module, magnetic field sensor, inductance L1 and switching molding
Block.
The control module is connect with the magnetic field sensor and the switch module, the switch module and the electricity
Sense L1 is used for and load in series, and the magnetic field sensor is used to detect the magnetic field of the inductance L1, and the control module is used for root
The switch module is controlled according to the magnetic field of the inductance L1, so that the switch module disconnects.
Specifically, due to inductance L1 and load in series, when load place short circuit or open circuit, circuit where load
Electric current change, cause to change by the electric current of inductance L1 so that inductance generate magnetic field change, this
Sample, the variation in the magnetic field and the magnetic field of inductance L1 is detected by magnetic field sensor, magnetic field that magnetic field sensor will test
It is converted to corresponding current signal and is sent to control module, control module is controlled according to the current signal that the magnetic field sensor is sent
Switch module disconnects.
Above-mentioned lightning protection device fail-safe circuit detects the magnetic field size of inductance L1 by magnetic field sensor, and magnetic field is big
Small to be converted to corresponding current signal, current signal is reached control module by magnetic field sensor, and control module is by corresponding electric current
Signal is compared with reference value preset in control module, when the current signal detected is greater than preset reference value, control
Molding block issues control signal, and the disconnection of control switch module makes to load power loss；Since lightning protection device fail-safe circuit can be in real time
The magnetic field of inductance L1 is detected, therefore when load short circuits, can cut off the power in time, load short circuits overlong time is avoided to cause to load
It is on fire, and even if lightning protection device fail-safe circuit can also work normally, to preferably protect when the lightning protection device of load fails
Load.
In one of the embodiments, referring to Fig. 1, providing a kind of lightning protection device fail-safe circuit 10, comprising: control mould
Block 300, magnetic field sensor 200, inductance L1 and switch module 100.
The control module 300 is connect with the magnetic field sensor 200 and the switch module 100, the switching molding
The block 100 and inductance L1 is used for and load in series, the magnetic field sensor 200 are used to detect the magnetic field of the inductance L1, institute
Control module 300 is stated for controlling the switch module 100 according to the magnetic field of the inductance L1, so that the switch module 100
It disconnects.
It is worth mentioning, the magnetic field sensor is the member that the amount in various magnetic fields and its variation can be transformed into electric signal
Part, the present embodiment, the size and its variable quantity in the magnetic field of inductance L1 that shown magnetic field sensor is used to will test are converted to pair
The current signal answered.
Above-mentioned lightning protection device fail-safe circuit detects the magnetic field size of inductance L1 by magnetic field sensor, generates induction
Signal is sent to control module, and control module converts induction signals into corresponding current signal, and preset in control module
Reference value is compared, and when the current signal detected is greater than preset reference value, control module issues control signal, control
The disconnection of switch module makes to load power loss；Due to the magnetic field of lightning protection device fail-safe circuit energy real-time detection inductance L1, work as
When load short circuits, can cut off the power in time, avoid load short circuits overlong time cause to load it is on fire, and even if load lightning protection
When device fails, lightning protection device fail-safe circuit can also be worked normally, thus preferably protection load.
In order to allow magnetic field sensor accurately to measure the magnetic field of inductance L1, the magnetic field in one of the embodiments,
Sensor is Hall element, and the Hall element is connect with the control module, and the Hall element is for detecting the inductance
The magnetic field of L1.Since Hall element has, precision is high, the good characteristic of the linearity, and Hall element does not occur electricity with circuit-under-test and connects
Touching, will not influence circuit-under-test, therefore, by the way that Hall element is arranged, can accurately detect inductance L1 and generate because of curent change
Magnetic field.
In order to more preferably protect Hall element and control module.In one of the embodiments, referring to Fig. 2, described is anti-
Thunder device fail-safe circuit 10 further includes that (TRANSIENT VOLTAGE SUPPRESSOR, transient voltage inhibit two poles to the first TVS
Pipe) pipe D1 and the second TVS pipe D2, the first end of the first TVS pipe D1 connect with the first pin of the Hall element 200,
The second end of the first TVS pipe D1 respectively with the second pin of the Hall element 200 and the second TVS pipe D2
One end connection, the second end of the second TVS pipe D2 are connect with the third pin of the Hall element 200, Hall element 200
The first pin connect with the first detection input of control module 300, the second pin and control module of Hall element 200
300 the second detection input connection, the third pin of Hall element 200 and the third detection input of control module 300 connect
It connects.In one embodiment, the TVS pipe is low pressure TVS pipe, i.e., the first end of the described first low pressure TVS pipe and the Hall
First pin of element connects, the second end of the first low pressure TVS pipe respectively with the second pin of the Hall element and institute
State the first end connection of the second low pressure TVS pipe, the second end of the second low pressure TVS pipe and the third pin of the Hall element
Connection.Since TVS pipe has the response time fastly and higher surge absoption ability, when high energy of the both ends of TVS pipe by moment
When stroke, the impedance value at TVS pipe both ends becomes Low ESR from high impedance, to absorb instantaneous large-current, therefore, by Hall
TVS pipe in parallel on the pin of element, when load meets with strong lightning stroke, the magnetic field transformation of inductance L1 is big, and Hall element will convert into
Current signal it is also bigger, TVS pipe absorbs instantaneous large-current, prevents Hall element and control module from damaging, to preferably protect
Protect Hall element and control module.
It is disconnected to make control module can control switch module, in one of the embodiments, referring to Fig. 2, described open
Closing module 100 includes that driving inductance and switch unit, the driving inductance are connect with the control module 300, and the switch is single
The first and described inductance L1 is used to the load in series, the driving inductance be used to that the switch unit to be driven to disconnect.At one
In embodiment, the quantity of the driving inductance is two, respectively driving inductance L2 and driving inductance L3, the driving inductance L2
And connect after the driving inductance L3 series connection with the control module 300, the driving inductance L2 and the driving inductance L3 are used
In driving the switch unit to disconnect, specifically, the first output end of the first end and control module 300 that drive inductance L2 connects
It connects, drives the second end of inductance L2 and the first end of driving inductance L3 to connect, drive the second end and control module 300 of inductance L3
The second input terminal connection.By the way that such switch module is arranged, when the electric current at the both ends inductance L1 is greater than preset value, mould is controlled
Block is powered to driving inductance, and driving inductance generates magnetic field and magnetic force, and the movable end of the switch unit is magnetic conductor, conductor
The contact of switch unit is detached under magneticaction, so that the switch unit made disconnects under the magnetic force, so that load is lost
Electricity, to protect load.
In order to enable switch unit to automatically reset conducting, in one of the embodiments, referring to Fig. 2, the switch is single
Member is that snap switch S2, the snap switch S2 and the inductance L1 are used to be used for the load in series, the driving inductance
The snap switch S2 is driven to disconnect.By the way that snap switch is arranged, when the received corresponding current signal of control module is greater than in advance
If reference value when, control module be driving inductance be powered so that driving inductance generate magnetic force, the magnetic force will be under snap switch
It draws, so that the snap switch be driven to disconnect, when load faulty is cut off, the received current signal of control module is less than described default
Reference value, control module stop to driving inductance power supply, drive the magnetic force of inductance to eliminate, the magnetic force that snap switch is subject to disappears
It removing, snap switch resets under the effect of elasticity, so that the snap switch is connected, in this way, by setting snap switch, when
Load faulty excision, can enable switch unit automatically reset conducting.
It is in one of the embodiments, referring to Fig. 3, described in order to preferably cut off the power when load is broken down
Switch module 100 is relay T1, and the relay T1 includes coil and switching group, and the coil and the control module connect
It connects, the switching group and inductance L1 is used for and load in series.It, can be with specifically, relay is a kind of electronic control device
With a kind of automatic switch of lesser current control larger current, by the way that relay is arranged, when control module detects, as inductance L1
When the electric current at both ends is greater than preset value, control module generates control signal, gives coil power supply, and coil generates magnetic force, and switching group exists
It is disconnected under the action of magnetic force, so that load power loss, to protect load.
In order to make lightning protection device fail-safe circuit preferably protect load, in one of the embodiments, referring to Fig. 2,
The lightning protection device fail-safe circuit 10 further includes battery module 400, and the battery module 400 connects with the control module 300
It connects.Specifically, battery module can be lithium battery, it is also possible to nickel-metal hydride battery, in another embodiment, the battery module
For battery.By the way that battery module is arranged, battery module is powered to control module, control module is worked normally, and adopt
It is powered with independent current source to control module, realizes control module and be isolated with forceful electric power, so that control module is not by main circuit power
Influence be more able to satisfy the demand of lightning protection circuit so that lightning protection device fail-safe circuit preferably protects load.
It is control module power supply to make battery module preferably, it is in one of the embodiments, referring to Fig. 2, described
Lightning protection device fail-safe circuit 10 further includes solar panel 500, the solar panel 500 and the control module
300 connections, the control module 300 are connect with the battery module 400.Solar panel absorbs sunlight, is converted to electricity
Can, it after being handled by control module, charges to battery module, so that battery module is kept sufficient electricity, to make battery module more
Good is control module power supply.
Check whether load works normally for the ease of user, it is in one of the embodiments, referring to Fig. 2, described
Lightning protection device fail-safe circuit 10 further includes indicator light 600 and resistance R1, the switch module 100 also with the indicator light 600
It connects with the resistance R1.Specifically, switch module is used to be grounded by indicator light and resistance R1, for example, the switch module
It is connect with after the indicator light and resistance R1 series connection with the inductance L1, i.e., switch module passes through indicator light and resistance R1
It connects with inductance L1, by setting indicator light and resistance R1, when loading normal work, the switch module is on shape
State, then indicator light is in luminance, and when short trouble occurs in load, the switch module is in an off state, then indicates
Lamp is in non-light emitting state, in this way, the light on and off by judging indicator light, consequently facilitating user checks whether load works normally.
The control module is MCU (Microcontroller Unit, microcontroller list in one of the embodiments,
Member), the MCU is connect with the magnetic field sensor and the switch module, and the MCU is used for the magnetic field according to the inductance L1
The switch module is controlled, so that the switch module is switched on or off.The inductance L1's that MCU is detected according to magnetic field sensor
Magnetic field size is converted to corresponding current signal and is compared with preset reference value, and detection is more than default to current signal
Reference value when, issue control signal, control switch module disconnect, thus play the role of protect circuit.
According to actual needs for the ease of user, different reference values is set, please refers to figure in one of the embodiments,
2, the lightning protection device fail-safe circuit 10 further includes reset switch S1, the first end and the control of the reset switch S1
The reset terminal of molding block connects, and the second end of the reset switch S1 is for being grounded.By the way that reset switch is arranged, when user needs
When reseting reference value, reset switch is pressed, so that control module is removed former preset reference value, so that user can be according to reality
Border demand resets reference value.
In one of the embodiments, as shown in figure 4, providing a kind of lightning protection device fail safe headlamp 20, including illumination
Lamp 700, lightning protection device 700 and any of the above-described lightning protection device fail-safe circuit 10 as described in the examples, the switch module and institute
It states inductance L1 to connect with the headlamp, the headlamp is also connect with the lightning protection device.
In the present embodiment, the first end of snap switch with the firewire of electric main for connecting, the second end of snap switch
For being connected by the zero curve of indicator light and resistance R1 and electric main, the second end of snap switch passes through inductance L1 and headlamp
First end connection, for connect with the zero curve of electric main, Hall element is used to detect inductance L1's for the second end of headlamp
Magnetic field, the first pin of Hall element 200 respectively with the first detection input of control module 300 and the first TVS pipe D1
One end connection, the second pin of Hall element 200 respectively with the second detection input of control module 300 and the first TVS pipe D1
Second end connection, the second pin of Hall element 200 also connect with the first end of the second TVS pipe D1, Hall element 200
Third pin is connect with the second end of the third detection input of control module 300 and the second TVS pipe, and the first of driving inductance L2
End is connect with the first output end of control module 300, and the second end of inductance L2 and the first end of driving inductance L3 is driven to connect,
The second end of driving inductance L3 is connect with the second input terminal of control module 300, and driving inductance L2 and driving inductance L3 are for driving
Dynamic snap switch S2 is disconnected, and the power end of control module 300 is connect with the battery module 400, the reset terminal of control module 300
It is connect with reset switch S1.
In one embodiment, the control module of the lightning protection device fail safe headlamp executes following in circuit protection
Step:
Reference current value is obtained by magnetic field sensor.
The current value of magnetic field sensor examinations inductance L1 is compared with reference current value.
When the current value is greater than 2 times of reference current value, driving inductance L2 and L3 power supply is given, control snap switch is disconnected
It opens, so that inductance L1 power loss, then re-start loop current detection.
When reference current value of the current value less than 2 times, then loop current detection is re-started.
Judge whether to input reset signal.
If so, executing the step of obtaining reference current value by magnetic field sensor.
If it is not, then executing the step for being compared the current value of magnetic field sensor real-time detection inductance L1 with reference current value
Suddenly.
Above-mentioned lightning protection device fail-safe circuit detects the magnetic field size of inductance L1 by magnetic field sensor, and magnetic field is big
Small to be converted to corresponding current signal, current signal is reached control module by magnetic field sensor, and control module is by corresponding electric current
Signal is compared with preset reference value, and when the current signal detected is greater than preset reference value, control module is issued
Signal is controlled, the disconnection of control switch module makes to load power loss；Due to lightning protection device fail-safe circuit energy real-time detection inductance L1
Magnetic field can cut off the power in time therefore when load short circuits, avoid load short circuits overlong time cause to load it is on fire, and
Even if lightning protection device fail-safe circuit can also work normally when the lightning protection device failure of load, thus preferably protection load.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of lightning protection device fail-safe circuit characterized by comprising control module, magnetic field sensor, inductance L1 and switch
Module；
The control module is connect with the magnetic field sensor and the switch module, the switch module and the inductance L1
For with load in series, the magnetic field sensor is used to detect the magnetic field of the inductance L1, and the control module is used for according to institute
The magnetic field for stating inductance L1 controls the switch module, so that the switch module disconnects.
2. lightning protection device fail-safe circuit according to claim 1, which is characterized in that the magnetic field sensor is Hall member
Part, the Hall element are connect with the control module, and the Hall element is used to detect the magnetic field of the inductance L1.
3. lightning protection device fail-safe circuit according to claim 2, which is characterized in that further include the first TVS pipe and second
TVS pipe, the first end of first TVS pipe are connect with the first pin of the Hall element, the second end of first TVS pipe
It is connect respectively with the first end of the second pin of the Hall element and second TVS pipe, the second end of second TVS pipe
It is connect with the third pin of the Hall element.
4. lightning protection device fail-safe circuit according to claim 1, which is characterized in that the switch module includes driving electricity
Sense and switch unit, the driving inductance are connect with the control module, and the switch unit and the inductance L1 are used for and institute
Load in series is stated, the driving inductance is for driving the switch unit to disconnect.
5. lightning protection device fail-safe circuit according to claim 4, which is characterized in that the switch unit is opened for spring
It closes, the snap switch and the inductance L1 are used to the load in series, the driving inductance be used to that the spring to be driven to open
Shutdown is opened.
6. lightning protection device fail-safe circuit according to claim 1, which is characterized in that the switch module is relay,
The relay includes coil and switching group, and the coil is connect with the control module, the switching group and the inductance L1
For with load in series.
7. lightning protection device fail-safe circuit described in -6 any one according to claim 1, which is characterized in that further include battery mould
Block, the battery module are connect with the control module.
8. lightning protection device fail-safe circuit according to claim 7, which is characterized in that it further include solar panel, institute
Solar panel is stated to connect with the control module.
9. lightning protection device fail-safe circuit according to claim 1, which is characterized in that it further include indicator light and resistance R1,
The switch module is also connected with the indicator light and the resistance R1.
10. a kind of lightning protection device fail safe headlamp, which is characterized in that including headlamp, lightning protection device and as claim 1-9 appoints
Lightning protection device fail-safe circuit described in one, the switch module and the inductance L1 connect with the headlamp, described
Headlamp is also connect with the lightning protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821890237.1U CN209029908U (en) | 2018-11-16 | 2018-11-16 | Lightning protection device fail-safe circuit and headlamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821890237.1U CN209029908U (en) | 2018-11-16 | 2018-11-16 | Lightning protection device fail-safe circuit and headlamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209029908U true CN209029908U (en) | 2019-06-25 |
Family
ID=66909665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821890237.1U Active CN209029908U (en) | 2018-11-16 | 2018-11-16 | Lightning protection device fail-safe circuit and headlamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209029908U (en) |
-
2018
- 2018-11-16 CN CN201821890237.1U patent/CN209029908U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9088152B2 (en) | Leakage detection protection circuit | |
| CN100483143C (en) | Magnet coil break detection circuit | |
| CN201383668Y (en) | Over-current protection circuit and motor controller applied to same | |
| CN201219092Y (en) | Ground fault interrupter | |
| CN205665378U (en) | Relay adhesion detection circuitry | |
| CN204789923U (en) | Failure detector circuit | |
| CN200947538Y (en) | Leakage protection switch of short circuit detection before switch on | |
| CN102570198B (en) | Human body induction energy-saving electric shock preventing socket | |
| CN209029908U (en) | Lightning protection device fail-safe circuit and headlamp | |
| CN204230865U (en) | A kind of motor protecting device | |
| CN2842833Y (en) | The electronic single-phase earth leakage circuit-breaker | |
| CN205484714U (en) | Circuit is listened to killer switch state | |
| CN104953537A (en) | Overload protection switching device | |
| CN201167078Y (en) | Intelligent protection switch for communication office stations | |
| CN205195233U (en) | Power leakage protector | |
| CN204615349U (en) | Remote signalling alarm device when a kind of integrated form Surge Protector Indication of Losing Efficacy and inefficacy | |
| CN204794065U (en) | Electric leakage circuit breaker thunderbolt surge protection circuit | |
| CN213072106U (en) | Surge protector failure indication and alarm device circuit | |
| CN106410658B (en) | A kind of electronic type of distribution terminal is anti-jump and switching on and off monitoring arrangement | |
| CN203631410U (en) | Vacuum circuit breaker controlling circuit and vacuum circuit breaker controlling system | |
| CN206272139U (en) | A kind of electronic type of distribution terminal it is anti-jump and point, combined floodgate monitoring arrangement | |
| CN201773791U (en) | IC card electric meter circuit breaker | |
| CN201260066Y (en) | Control circuit for multifunctional protection socket | |
| CN2879407Y (en) | Fast exit module having hardware self-holding function | |
| CN205141633U (en) | Idle power consumptive motivation protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |