CN205945014U - Earthing wire detecting circuit - Google Patents
Earthing wire detecting circuit Download PDFInfo
- Publication number
- CN205945014U CN205945014U CN201620310201.6U CN201620310201U CN205945014U CN 205945014 U CN205945014 U CN 205945014U CN 201620310201 U CN201620310201 U CN 201620310201U CN 205945014 U CN205945014 U CN 205945014U
- Authority
- CN
- China
- Prior art keywords
- circuit
- photoelectrical coupler
- phototriode
- power supply
- signal
- 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
Abstract
The utility model provides an earthing wire detecting circuit, include: switching circuit, signal acquisition circuit, processing circuit, the switching circuit is selected alternating current power supply and signal acquisition circuit or main loop connection, when signal acquisition circuit was connected with alternating current power supply, whether normally signal acquisition circuit detected alternating current power supply ground connection to send a signal to processing circuit, if alternating current power supply ground connection is normal, then processing circuit sends control signal and makes the switching circuit switch to with alternating current power supply and main loop connection, if alternating current power supply ground connection is unusual, then processing circuit sends control signal and makes the switching circuit keep alternating current power supply and signal acquisition circuit to be connected. The utility model provides an earthing wire detecting circuit, when equipment circular telegram is used, earlier to equipment whether normal ground connection make the judgement, when the equipment ground just often detection circuitry be connected the major loop of equipment with the power, when the equipment ground was unusual, detection circuitry kept major loop and power supply disconnection's state.
Description
Technical field
This utility model is related to a kind of earthing wire detecting circuit.
Background technology
At present, electrical equipment grounding is to ensure that the essential condition of the normal use of electrical equipment and Electrical Safety, typically will
The ground wire of the shell of electrical equipment and power supply is connected to the earth by earth lead.In actual use, the ground connection of electrical equipment
When loose contact in line, electrical equipment can not voluntarily detect also can not take protective measure, therefore to electrical equipment and operation
There is potential safety hazard in persons etc..
Utility model content
Technical problem underlying to be solved in the utility model is to provide a kind of earthing wire detecting circuit, makes in equipment energising
Used time, first to equipment, whether normal ground judges, when equipment ground is normal testing circuit by the major loop of equipment with electricity
Source connects；When equipment ground is abnormal, testing circuit keeps the state that major loop is disconnected with power supply.
In order to solve above-mentioned technical problem, this utility model provides a kind of earthing wire detecting circuit, including：Switching electricity
Road, signal acquisition circuit, signal processing circuit；
Described switching circuit selects to be connected alternating current power supply with signal acquisition circuit or major loop；When signal acquisition circuit with
When alternating current power supply connects, signal acquisition circuit detection alternating current power supply whether normal ground, and send a signal to signal processing circuit；
If alternating current power supply ground connection is normal, signal processing circuit sends control signal so that switching circuit switches to alternating current power supply and master
Loop connects；If alternating current power supply ground connection is abnormal, signal processing circuit sends control signal and makes switching circuit keep alternating current
Source is connected with signal acquisition circuit.
In a preferred embodiment：Described signal acquisition circuit includes rectification circuit and photoelectrical coupler.
In a preferred embodiment：The input of described rectification circuit is connected with zero line and live wire, and outfan passes through one and drops
Pressure network network is connected with the anode of light emitting diode in photoelectrical coupler, and the negative electrode of light emitting diode is connected with ground wire.
In a preferred embodiment：Described signal acquisition circuit includes half bridge rectification circuit, transformator, full-bridge rectification electricity
Road and photoelectrical coupler；The input of described Half bridge rectifier circuit is connected with live wire and zero line, outfan and primary line
One end of circle connects；The other end of transformer is connected with ground wire；The two ends of transformer secondary coil respectively with full-bridge
The input of rectification circuit connects；The outfan of full bridge rectifier positive pole and the negative pole with diode in photoelectrical coupler respectively
Connect.
In a preferred embodiment：Described signal processing circuit includes an analog-digital converter, and it is with described photoelectrical coupler
The colelctor electrode of middle phototriode connects；When phototriode collector voltage is constant, analog-digital converter output is low level
Control signal；When phototriode collector voltage assumes height change, analog-digital converter exports the control signal of high level.
In a preferred embodiment：Described photoelectrical coupler includes the first photoelectrical coupler and the second photoelectrical coupler, institute
State rectification circuit and include the first rectifier bridge and the second rectifier bridge；The input of described first rectifier bridge is connected with live wire and ground wire,
Cathode output end is connected with the anode of light emitting diode in the first photoelectrical coupler, in cathode output end and the first photoelectrical coupler
The negative electrode of light emitting diode connects；The input of described second rectifier bridge is connected with ground wire and zero line, cathode output end and second
In photoelectrical coupler, the anode of light emitting diode connects, the negative electrode of light emitting diode in cathode output end and the second photoelectrical coupler
Connect.
In a preferred embodiment：Described signal processing circuit includes an XOR gate, its input respectively with the first photoelectricity
In bonder, the second photoelectrical coupler, the colelctor electrode of phototriode connects；
Light in the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler
During the colelctor electrode output high level of quick audion, the outfan of XOR gate exports the control signal of high level；When the first smooth thermocouple
The colelctor electrode output of the phototriode in the colelctor electrode output low level of the phototriode in clutch, the second photoelectrical coupler
During low level, the outfan of XOR gate exports low level control signal.
In a preferred embodiment：Described signal processing circuit includes a MCU, its input respectively with the first photoelectric coupling
In device, the second photoelectrical coupler, the colelctor electrode of phototriode connects；
Light in the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler
During the colelctor electrode output high level of quick audion, the outfan of MCU exports the control signal of high level；When the first photoelectrical coupler
In phototriode colelctor electrode export low level, the colelctor electrode of phototriode in the second photoelectrical coupler exports low electricity
At ordinary times, the outfan of MCU exports low level control signal.
In a preferred embodiment：Described switching circuit includes a relay and switching tube；The normally closed of described relay is touched
Point is connected with signal sample circuit；Normally opened contact is connected with major loop；The grid of described switching tube is defeated with signal processing circuit
Go out end to connect.
In a preferred embodiment：Described switching circuit includes a RCD circuit, relay and switching tube；Described relay
Normally-closed contact be connected with signal sample circuit；Normally opened contact is connected with major loop；The grid of described switching tube and signal processing
The outfan of circuit connects；
When the normally opened contact of relay disconnects, the single-pole double-throw switch (SPDT) in RCD circuit is connected with signal sample circuit；Relay
During the normally opened contact closure of device, the single-pole double-throw switch (SPDT) in RCD circuit is connected with major loop.
In a preferred embodiment：Described switching circuit includes a RCD circuit, relay and switching tube；Described RCD circuit
Switch be connected with major loop；The normally opened contact of described relay is connected with signal sample circuit；The grid of described switching tube with
The outfan of signal processing circuit connects；
When the normally opened contact of relay disconnects, the switch in RCD circuit is connected with major loop；The normally opened contact of relay closes
During conjunction, the switch in RCD circuit is disconnected with major loop.
In a preferred embodiment：Also include a warning circuit, described warning circuit has buzzer and/or display lamp.
Compared to prior art, the technical solution of the utility model possesses following beneficial effect：
Whether this utility model provides a kind of earthing wire detecting circuit, when equipment energising uses, first normal to equipment
Ground connection judges, and when equipment ground is normal, the major loop of equipment is connected by testing circuit with power supply；When equipment ground is abnormal
When, testing circuit keeps the state that major loop is disconnected with power supply.
Brief description
Fig. 1 is the integrated circuit figure of this utility model preferred embodiment 1；
Fig. 2 is signal acquisition circuit figure in this utility model preferred embodiment 1；
Fig. 3 is signal processing circuit figure in this utility model preferred embodiment 1；
Fig. 4 is switching circuit figure in this utility model preferred embodiment 1；
Fig. 5 is warning circuit figure in this utility model preferred embodiment 1；
Fig. 6 is signal processing circuit figure in this utility model preferred embodiment 2；
Fig. 7 is switching circuit figure in this utility model preferred embodiment 3；
Fig. 8 is signal acquisition circuit figure in this utility model preferred embodiment 4；
Fig. 9 is signal acquisition circuit figure in this utility model preferred embodiment 5；
Figure 10 is switching circuit figure in this utility model preferred embodiment 6.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, this utility model is described further.
Embodiment 1
Reference Fig. 1, a kind of earthing wire detecting circuit, including：Switching circuit, signal acquisition circuit, signal processing circuit；Institute
State switching circuit to select to be connected alternating current power supply with signal acquisition circuit or major loop；When signal acquisition circuit and alternating current power supply
During connection, signal acquisition circuit detection alternating current power supply whether normal ground, and send a signal to signal processing circuit；If alternating current
Source ground connection is normal, then signal processing circuit sends control signal so that switching circuit switches to by alternating current power supply with major loop even
Connect；If alternating current power supply ground connection is abnormal, signal processing circuit sends control signal and makes switching circuit keep alternating current power supply and letter
Number Acquisition Circuit connects.
Therefore, above-mentioned earthing wire detecting circuit, can electrical equipment connect electricity work when, first by the major loop of equipment with
Alternating current power supply disconnects；Using signal acquisition circuit, to electrical equipment, whether normal ground judges.In equipment normal ground,
Electricity use is normally gone up in major loop and alternating current power supply connection.When unit exception is grounded, major loop and alternating current power supply remain disconnected
Open.
With reference to Fig. 2, in the present embodiment, described signal acquisition circuit includes the first photoelectrical coupler U1, the second smooth thermocouple
Clutch U2, the first rectifier bridge and the second rectifier bridge；The input of described first rectifier bridge is connected with live wire and ground wire, and positive pole exports
End is connected with the anode of light emitting diode in the first photoelectrical coupler U1, luminous in cathode output end and the first photoelectrical coupler U1
The negative electrode of diode connects；The input of described second rectifier bridge is connected with ground wire and zero line, cathode output end and the second photoelectricity
In bonder U2, the anode of light emitting diode connects, the negative electrode of light emitting diode in cathode output end and the second photoelectrical coupler U2
Connect.
When ground wire grounded normal, light emitting diode electrified light emitting in the first photoelectrical coupler U1 is so that the first smooth thermocouple
Phototriode saturation conduction in clutch U1, the colelctor electrode output low level of phototriode；In second photoelectrical coupler U2
Light emitting diode does not have electric current to flow through so that the phototriode in the second photoelectrical coupler U2 ends, the collection of phototriode
Electrode exports high level.
When ground connection is abnormal, light emitting diode electrified light emitting in the first photoelectrical coupler U1 is so that the first photoelectricity
Phototriode saturation conduction in bonder U1, the colelctor electrode output low level of phototriode；Second photoelectrical coupler U2
Middle light emitting diode electrified light emitting so that phototriode saturation conduction in the second photoelectrical coupler U2, phototriode
Colelctor electrode exports low level.
With further reference to Fig. 3, described signal processing circuit includes an XOR gate, its input respectively with the first smooth thermocouple
In clutch U1, the second photoelectrical coupler U2, the colelctor electrode of phototriode connects；
Light in the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler
During the colelctor electrode output high level of quick audion, the outfan of XOR gate exports the control signal of high level；
Light in the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler
During the colelctor electrode output low level of quick audion, the outfan of XOR gate exports low level control signal.
With further reference to Fig. 4, described switching circuit includes a relay D1 and switching tube Q1；Described relay D1's is normally closed
Contact is connected with signal sample circuit；Normally opened contact is connected with major loop；The grid of described switching tube and signal processing circuit
Outfan connects.
When the outfan output low level control signal of XOR gate, described switching tube Q1 cut-off, relay D1's is normally opened
Contact remains open, and therefore major loop keeps disconnecting with alternating current power supply, ensure that major loop will not when ground connection is abnormal
Connect with alternating current power supply.
When the outfan output high-level control signal of XOR gate, described switching tube Q1 conducting, relay D1's is normally opened
The closing of contact, normally-closed contact disconnects.Therefore major loop is connected with alternating current power supply, ensure that major loop when ground connection is normal
Can be energized work in time.
With continued reference to Fig. 5, also include a warning circuit, described warning circuit has buzzer.When ground connection is abnormal
When, this buzzer sends alarm signal.Certainly, type of alarm can also be by the way of display lamp be reported to the police, or display lamp+honeybee
The mode of ring device group alarm.Belong to simple replacement of the present utility model, repeat no more.
Embodiment 2
With reference to Fig. 6, the present embodiment is with the difference of embodiment 1：In the present embodiment, described signal processing circuit includes
One MCU, its input is connected with the colelctor electrode of phototriode in the first photoelectrical coupler U1, the second photoelectrical coupler U2 respectively
Connect；
Light in the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler
During the colelctor electrode output high level of quick audion, the outfan of MCU exports the control signal of high level；
Light in the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler
During the colelctor electrode output low level of quick audion, the outfan of MCU exports low level control signal.
Remainder is same as Example 1, repeats no more.
Embodiment 3
With reference to Fig. 7, the present embodiment is with the difference of embodiment 1：Described switching circuit includes a RCD circuit, relay
D2 and switching tube Q2；The normally-closed contact of described relay D2 is connected with signal sample circuit；Normally opened contact is connected with major loop；Institute
The outfan of the grid and signal processing circuit of stating switching tube Q2 is connected；
When the normally opened contact of relay D2 disconnects, the single-pole double-throw switch (SPDT) in RCD circuit is connected with signal sample circuit；Continue
During the normally opened contact closure of electrical equipment D2, the single-pole double-throw switch (SPDT) in RCD circuit is connected with major loop.
Remainder is same as Example 1, repeats no more.
Embodiment 4
With reference to Fig. 8, the present embodiment is with the difference of embodiment 1：Described signal acquisition circuit includes rectification circuit and light
Electric coupler U3.
The input of described rectification circuit is connected with zero line and live wire, and outfan passes through a decompression network and photoelectrical coupler
In U3, the anode of light emitting diode connects, and the negative electrode of light emitting diode is connected with ground wire.
When ground connection is normal, earth terminal is 0 current potential.It is continuous that alternating current forms positive half cycle after rectification circuit
The unidirectional current of distribution, within the cycle of a positive half cycle, the light emitting diode in photoelectrical coupler U3 was sent out within a period of time
Light, extinguishing in a period of time.Therefore, the phototriode in photoelectrical coupler U3 turns on, in certain time within a certain period of time
Cut-off.The voltage of the therefore colelctor electrode of phototriode changes between saturation voltage and blanking voltage, assumes the form of square wave.
When ground connection is abnormal, earth lead is hot end, and the light emitting diode in photoelectrical coupler U3 puts out all the time
Go out, phototriode is in cut-off state all the time, therefore, the collector voltage of phototriode is identical with supply voltage all the time,
In straight line.
Described signal processing circuit includes an analog-digital converter, its collection with phototriode in described photoelectrical coupler U3
Electrode connects；When phototriode collector voltage is constant, analog-digital converter exports low level control signal；When photosensitive three
When pole pipe collector voltage assumes height change, analog-digital converter exports the control signal of high level.
Remainder is same as Example 1, repeats no more.
Embodiment 5
With reference to Fig. 9, the present embodiment is with the difference of embodiment 1：Described signal acquisition circuit includes a half-bridge rectified current
Road, transformator, full bridge rectifier and photoelectrical coupler U5；The input of described Half bridge rectifier circuit is connected with live wire and zero line
Connect, outfan is connected with one end of transformer；The other end of transformer is connected with ground wire；Transformator
The two ends of level coil are connected with the input of full bridge rectifier respectively；The outfan of full bridge rectifier respectively with photoelectric coupling
In device U5, the positive pole of diode and negative pole connect.
When ground connection is normal, earth terminal is 0 current potential.Phototriode in photoelectrical coupler U5 is in certain time
Cut-off in interior conducting, certain time.Therefore the colelctor electrode of phototriode voltage saturation voltage and blanking voltage anaplasia
Change, assume the form of square wave.
When ground connection is abnormal, earth lead is hot end, and the light emitting diode in photoelectrical coupler U5 puts out all the time
Go out, phototriode is in cut-off state all the time, therefore, the collector voltage of phototriode is identical with supply voltage all the time,
In straight line.
Described signal processing circuit includes an analog-digital converter, its collection with phototriode in described photoelectrical coupler U5
Electrode connects；When phototriode collector voltage is constant, analog-digital converter exports low level control signal；When photosensitive three
When pole pipe collector voltage assumes height change, analog-digital converter exports the control signal of high level.
Remainder is same as Example 1, repeats no more.
Embodiment 6
The present embodiment is with the difference of embodiment 1：With reference to Figure 10, described switching circuit includes a RCD circuit, relay
D1 and switching tube Q1；The switch K1 of described RCD circuit is connected with major loop；The normally opened contact of described relay D1 and signal sampling
Circuit connects；The described grid of switching tube Q1 is connected with the outfan of signal processing circuit；
When the normally opened contact of relay D1 disconnects, the switch K1 in RCD circuit is connected with major loop；Relay D1's is normally opened
During the closing of contact, the switch K1 in RCD circuit is disconnected with major loop.
Remainder is same as Example 1, repeats no more.
The above, only this utility model preferably specific embodiment, but protection domain of the present utility model is not
It is confined to this, any those familiar with the art, in the technical scope that this utility model discloses, can readily occur in
Change or replacement, all should cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is defined by scope of the claims.
Claims (12)
1. a kind of earthing wire detecting circuit is it is characterised in that include：Switching circuit, signal acquisition circuit, signal processing circuit；
Described switching circuit selects to be connected alternating current power supply with signal acquisition circuit or major loop；When signal acquisition circuit with exchange
When power supply connects, signal acquisition circuit detection alternating current power supply whether normal ground, and send a signal to signal processing circuit；If handing over
Stream power ground is normal, then signal processing circuit sends control signal so that switching circuit switches to alternating current power supply and major loop
Connect；If alternating current power supply ground connection is abnormal, signal processing circuit send control signal make switching circuit keep alternating current power supply with
Signal acquisition circuit connects.
2. a kind of earthing wire detecting circuit according to claim 1 it is characterised in that：Described signal acquisition circuit includes whole
Current circuit and photoelectrical coupler.
3. a kind of earthing wire detecting circuit according to claim 2 it is characterised in that：The input of described rectification circuit with
Zero line and live wire connect, and outfan is connected with the anode of light emitting diode in photoelectrical coupler by a decompression network, and luminous two
The negative electrode of pole pipe is connected with ground wire.
4. a kind of earthing wire detecting circuit according to claim 1 it is characterised in that：Described signal acquisition circuit includes one
Half bridge rectifier circuit, transformator, full bridge rectifier and photoelectrical coupler；The input of described Half bridge rectifier circuit and live wire and
Zero line connects, and outfan is connected with one end of transformer；The other end of transformer is connected with ground wire；Become
The two ends of depressor secondary coil are connected with the input of full bridge rectifier respectively；The outfan of full bridge rectifier respectively with light
In electric coupler, the positive pole of diode and negative pole connect.
5. a kind of earthing wire detecting circuit according to Claims 2 or 3 it is characterised in that：Described signal processing circuit bag
Include an analog-digital converter, it is connected with the colelctor electrode of phototriode in described photoelectrical coupler；When phototriode colelctor electrode
When voltage is constant, analog-digital converter exports low level control signal；When phototriode collector voltage assumes height change
When, analog-digital converter exports the control signal of high level.
6. a kind of earthing wire detecting circuit according to claim 2 it is characterised in that：Described photoelectrical coupler includes
One photoelectrical coupler and the second photoelectrical coupler, described rectification circuit include the first rectifier bridge and the second rectifier bridge；Described first
The input of rectifier bridge is connected with live wire and ground wire, and in cathode output end and the first photoelectrical coupler, the anode of light emitting diode connects
Connect, cathode output end is connected with the negative electrode of light emitting diode in the first photoelectrical coupler；The input of described second rectifier bridge with
Ground wire and zero line connect, and cathode output end is connected with the anode of light emitting diode in the second photoelectrical coupler, cathode output end and
In second photoelectrical coupler, the negative electrode of light emitting diode connects.
7. a kind of earthing wire detecting circuit according to claim 6 it is characterised in that：Described signal processing circuit includes one
XOR gate, its input is connected with the colelctor electrode of phototriode in the first photoelectrical coupler, the second photoelectrical coupler respectively；
In the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler photosensitive three
During the colelctor electrode output high level of pole pipe, the outfan of XOR gate exports the control signal of high level；When the first photoelectrical coupler
In phototriode colelctor electrode export low level, the colelctor electrode of phototriode in the second photoelectrical coupler exports low electricity
At ordinary times, the outfan of XOR gate exports low level control signal.
8. a kind of earthing wire detecting circuit according to claim 6 it is characterised in that：Described signal processing circuit includes one
MCU, its input is connected with the colelctor electrode of phototriode in the first photoelectrical coupler, the second photoelectrical coupler respectively；
In the colelctor electrode output low level of the phototriode in the first photoelectrical coupler, the second photoelectrical coupler photosensitive three
During the colelctor electrode output high level of pole pipe, the outfan of MCU exports the control signal of high level；When in the first photoelectrical coupler
The colelctor electrode output low level of the phototriode in the colelctor electrode output low level of phototriode, the second photoelectrical coupler
When, the outfan of MCU exports low level control signal.
9. a kind of earthing wire detecting circuit according to claim 1 it is characterised in that：Described switching circuit includes a relay
Device and switching tube；The normally-closed contact of described relay is connected with signal sample circuit；Normally opened contact is connected with major loop；Described
The grid of switching tube is connected with the outfan of signal processing circuit.
10. a kind of earthing wire detecting circuit according to claim 1 it is characterised in that：Described switching circuit includes a RCD
Circuit, relay and switching tube；The normally-closed contact of described relay is connected with signal sample circuit；Normally opened contact is with major loop even
Connect；The grid of described switching tube is connected with the outfan of signal processing circuit；
When the normally opened contact of relay disconnects, the single-pole double-throw switch (SPDT) in RCD circuit is connected with signal sample circuit；Relay
During normally opened contact closure, the single-pole double-throw switch (SPDT) in RCD circuit is connected with major loop.
A kind of 11. earthing wire detecting circuits according to claim 1 it is characterised in that：Described switching circuit includes a RCD
Circuit, relay and switching tube；The switch of described RCD circuit is connected with major loop；The normally opened contact of described relay and signal
Sample circuit connects；The grid of described switching tube is connected with the outfan of signal processing circuit；
When the normally opened contact of relay disconnects, the switch in RCD circuit is connected with major loop；The normally opened contact closure of relay
When, the switch in RCD circuit and major loop disconnect.
A kind of 12. earthing wire detecting circuits according to claim 1 it is characterised in that：Also include a warning circuit, described
Warning circuit has buzzer and/or display lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620310201.6U CN205945014U (en) | 2016-04-14 | 2016-04-14 | Earthing wire detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620310201.6U CN205945014U (en) | 2016-04-14 | 2016-04-14 | Earthing wire detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205945014U true CN205945014U (en) | 2017-02-08 |
Family
ID=57933795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620310201.6U Active CN205945014U (en) | 2016-04-14 | 2016-04-14 | Earthing wire detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205945014U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459227A (en) * | 2017-02-21 | 2018-08-28 | 台达电子企业管理（上海）有限公司 | Ground line detection circuit |
-
2016
- 2016-04-14 CN CN201620310201.6U patent/CN205945014U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459227A (en) * | 2017-02-21 | 2018-08-28 | 台达电子企业管理（上海）有限公司 | Ground line detection circuit |
| US10627454B2 (en) | 2017-02-21 | 2020-04-21 | Delta Electronics (Shanghai) Co., Ltd | Grounding wire detection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202815578U (en) | Intelligent fault detection circuit for a power distribution switch control loop | |
| CN204203345U (en) | A kind of voltage detecting circuit | |
| CN103647252A (en) | Electric leakage switch having FSK communication function | |
| CN205945014U (en) | Earthing wire detecting circuit | |
| CN206787615U (en) | A kind of monitoring system of multifunctional unit | |
| CN104330607B (en) | Alternating current scurries into the detection of straight-flow system and compels to jump device | |
| CN106132050A (en) | Intelligent road-lamp with residual current protecting controls chopper | |
| CN205141289U (en) | Convertible ground wire protected mode's leakage protection plug | |
| CN204012651U (en) | A kind of direct current leakage protection circuit | |
| CN204927704U (en) | Convertible ground wire protected mode's leakage protection plug | |
| CN201402298Y (en) | Detection device for anomaly detection of zero line and earth wire of leakage protection device | |
| CN104034157A (en) | Runout alarm circuit of crucible electric induction furnace | |
| CN205029117U (en) | Current leakage protection plug | |
| CN205029118U (en) | Convertible protected mode's leakage protection plug | |
| CN204166102U (en) | A kind of strong electrically driven (operated) switch condition detection circuit | |
| CN206918782U (en) | A kind of controller with water leakage detecting function | |
| CN209311610U (en) | A kind of metal-back electric equipment products electric leakage alarm device with self-checking function | |
| CN104143811B (en) | A kind of direct current leakage protective circuit | |
| CN203180491U (en) | Electric leakage protection device | |
| CN208460170U (en) | A kind of substation SF6 switch work monitoring alarm device | |
| CN205844398U (en) | High-voltage fence false alarm prevention device | |
| CN205141287U (en) | Can change ground wire protected mode's leakage protection plug | |
| CN209946255U (en) | High tension switchgear electrification indicating device with line grounding protection | |
| CN206096281U (en) | Monitoring devices to 400V power supply system | |
| CN204905588U (en) | Electric leakage protection plug |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |