CN206412749U - The control circuit of the earth leakage protective device of the double protections of ground wire - Google Patents
The control circuit of the earth leakage protective device of the double protections of ground wire Download PDFInfo
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- CN206412749U CN206412749U CN201720063531.4U CN201720063531U CN206412749U CN 206412749 U CN206412749 U CN 206412749U CN 201720063531 U CN201720063531 U CN 201720063531U CN 206412749 U CN206412749 U CN 206412749U
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- divider resistance
- ground wire
- pole
- controllable silicon
- earth leakage
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Abstract
The utility model discloses a kind of control circuit of the earth leakage protective device of the double protections of ground wire, including the first current transformer, second current transformer, control chip, switching diode D3, controllable silicon Q1, tripping coil, commutation diode D2, divider resistance R11, divider resistance R12 and switching diode D5, first current transformer is arranged on fire, zero line output end, the output end of its secondary coil and the input of control chip are connected, second current transformer is arranged on ground terminal, the input connection of its output end and control chip, one output end of control chip is connected by switching diode D3 with controllable silicon Q1 control pole, controllable silicon Q1 anode is connected by commutation diode D1 with tripping coil, its negative electrode is connected with zero line, tripping coil links with de- mouth mechanism.The control circuit of earth leakage of the double protections of ground wire of the present utility model can more effectively protect Electrical Safety using the double protection structures of ground wire.
Description
Technical field
The utility model is related to a kind of control circuit of the earth leakage protective device of the double protections of ground wire, belongs to earth leakage protective device control
Technical field.
Background technology
The safety switch that earth leakage protective device is used as electrical equipment, it plays most important effect to Electrical Safety.It is existing
Most of earth leakage protective device can actively cut off the electricity supply when detecting fire, zero line electric leakage, play safeguard protection effect, but over the ground
Line electric leakage is then without safeguard measure, and the protective effect of earth leakage protective device is under some influence, and electrical equipment is there is safety when using hidden
Suffer from.
Utility model content
There is provided a kind of earth leakage protective devices of the double protections of ground wire in order to overcome the shortcomings of prior art presence for the utility model
Control circuit.
The utility model can be by taking following technical scheme to be achieved：
A kind of control circuit of the earth leakage protective device of the double protections of ground wire, including the first current transformer, the second Current Mutual Inductance
Device, control chip, switching diode D3, controllable silicon Q1, tripping coil, commutation diode D1, commutation diode D2, divider resistance
R11, divider resistance R12 and switching diode D5, the first current transformer are arranged on fire, zero line output end, its secondary coil
The input connection of output end and control chip, the second current transformer is arranged on ground line output terminal, the output of its secondary coil
End is connected by the input of current-limiting resistance R2 and control chip, an output end of control chip by switching diode D3 with can
Silicon Q1 control pole connection is controlled, controllable silicon Q1 anode is connected by commutation diode D1 with tripping coil, its negative electrode and zero line
Connection, tripping coil is linked with de- mouth mechanism, and commutation diode D2 positive pole is connected with ground wire, its negative pole series connection divider resistance
R11 and divider resistance R12 are followed by zero line, and switching diode D5 positive pole is connected on divider resistance R11 and divider resistance R12 company
Place is met, its negative pole is connected with controllable silicon Q1 control pole.
Preferably, the control circuit of the earth leakage protective device of the double protections of the ground wire also includes temperature-sensitive detection module, temperature-sensitive
Detection module is connected by switching diode D4 with controllable silicon Q1 control pole.
Preferably, the temperature-sensitive detection module includes thermistor RT, divider resistance R4 and divider resistance R5, temperature-sensitive
After resistance RT and divider resistance R4, divider resistance R5 series connection and filter capacitor C6 two ends are connected to, switching diode D4 is just
Pole is connected at thermistor RT and divider resistance R5 tie point, and its negative pole is connected with controllable silicon Q1 control pole.
Preferably, described thermistor RT uses negative tempperature coefficient thermistor.
Compared with prior art, the beneficial effects of the utility model are：The utility model utilizes the second current transformer
Examine geodesic drain conditions and controlled silicon conducting is made by control chip controlling switch diode D3 conductings, lead to tripping coil
Electric job control tripping mechanism is cut off the electricity supply, and safeguard protection effect is played in the use to earth leakage protective device；Meanwhile, utilize rectification two
Pole pipe D2 concatenates two divider resistances and is connected between ground wire and zero line, and the company of two divider resistances is connected to using switching diode D5
Meet place to be connected with the control pole of controllable silicon, make controlled silicon conducting using switching diode D5 conductings, make tripping coil energization work
Control tripping mechanism is cut off the electricity supply, and safeguard protection effect is played in the use to earth leakage protective device, can using the double protection structures of ground wire
More effectively protect Electrical Safety；Alternatively, it is also possible to detect the temperature in use of earth leakage protective device using temperature-sensitive detection module and lead to
Crossing switching diode turns on controllable silicon, tripping coil energization job control tripping mechanism is cut off the electricity supply, to earth leakage protective
The applied at elevated temperature of device plays safeguard protection effect, can be effectively prevented from that ambient temperature is too high or Plug contact is bad or load appliance
The excessive potential safety hazard of power.The control circuit collection ground wire of the earth leakage protective device of the double protections of ground wire of the present utility model, fire, zero line
Electric leakage automatic detection and overheating detection, ground wire overvoltage are detected on one, can fast and effeciently detect electricity consumption hidden danger, it is ensured that electricity consumption is pacified
Entirely.
Brief description of the drawings
Fig. 1 is the circuit diagram of the control circuit of the earth leakage protective device of the double protections of ground wire of the present utility model.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
As shown in figure 1, a kind of control circuit of the earth leakage protective devices of the double protections of ground wire includes the first current transformer L1, the
Two current transformer L2, control chip M54123, switching diode D3, controllable silicon Q1, tripping coil, temperature-sensitive detection module and open
Diode D4 is closed, current transformer L1 is arranged on fire, zero line output end, and the output end of its secondary coil is connected to control chip
The M54123 pin of input 1 and 2 pin.Second current transformer L2 is arranged on ground line output terminal, and connects concatenation after sense resistance R3
It is connected after current-limiting resistance R2 with control chip the M54123 pin of input 1 and 2 pin.The control chip M54123 pin of an output end 3
It is connected by switching diode D3 with controllable silicon Q1 control pole, controllable silicon Q1 anode is with passing through commutation diode D1 and dropout
Coil K connections, its negative electrode is connected with zero line, and tripping coil K links with de- mouth mechanism, and temperature-sensitive detection module passes through switching diode
D4 is connected with controllable silicon Q1 control pole, and commutation diode D2 positive pole is connected with ground wire, its negative pole series connection divider resistance R11 and
Divider resistance R12 is followed by zero line, and switching diode D5 positive pole is connected on divider resistance R11 and divider resistance R12 junction,
Its negative pole is connected with controllable silicon Q1 control pole.Wherein, temperature-sensitive detection module includes thermistor RT and divider resistance R4, partial pressure
After resistance R5, thermistor RT and divider resistance R4, divider resistance R5 series connection and it is connected to filter capacitor C6 two ends, switch two
Pole pipe D4 positive pole is connected at thermistor RT and divider resistance R5 tie point, and the control pole of its negative pole and controllable silicon Q1 connects
Connect.
The operation principle of the control circuit of the earth leakage protective device of the double protections of ground wire of the present utility model is as follows：When ground wire occurs
During electric leakage, the second current transformer L2 detects the electric leakage signal voltage of electric wire and electric leakage signal voltage is sent to control chip
M54123, after control chip M54123 processing, amplification, then the control after switching diode D3 identifications to controllable silicon Q1
Pole, triggering controllable silicon Q1 conductings, makes tripping coil K energization work, so that de- mouth mechanism action, separates dynamic and static contact, disconnect
Power supply；When ground wire voltage exceedes setting value, the current potential rise of divider resistance R11 and divider resistance R12 tie point makes switch
Diode D5 conducting triggering controllable silicons Q1 control pole, triggers controlled silicon conducting, makes tripping coil K energization work, so that de-
Mouth mechanism is acted, and separates dynamic and static contact, deenergization；When the electrical appliance that earth leakage protective device is protected occurs leaking electricity or person electric shock
When, zero sequence current mutual inductor L1 detects electric leakage signal voltage and electric leakage signal voltage is sent to control chip M54123, passes through
After control chip M54123 processing, amplification, then the control pole after switching diode D3 identifications to controllable silicon Q1, trigger controllable silicon
Conducting, makes tripping coil K energization work, so that de- mouth mechanism action, separates dynamic and static contact, deenergization.Work as ambient temperature
Too high or Plug contact is bad or load appliance power is excessive and causes earth leakage protective device temperature too high, makes thermistor RT resistance
Value reduces, and the voltage shared reduces, so that resistance R5 and RT tie point current potential rise, switching diode D4 conductings, triggering
Controlled silicon conducting, makes tripping coil K energization work, so that de- mouth mechanism action, separates dynamic and static contact, deenergization.
The utility model is described above in association with preferred embodiment, but the utility model is not limited to the above and taken off
The embodiment shown, and the various modifications carried out according to essence of the present utility model, equivalent combinations should be covered.
Claims (4)
1. the control circuit of the earth leakage protective device of the double protections of a kind of ground wire, it is characterised in that including the first current transformer, second
Current transformer, control chip, switching diode D3, controllable silicon Q1, tripping coil, commutation diode D1, commutation diode D2,
Divider resistance R11, divider resistance R12 and switching diode D5, the first current transformer are arranged on fire, zero line output end, secondly
The output end of level coil and the input of control chip are connected, and the second current transformer is arranged on ground line output terminal, its secondary wire
The output end of circle is connected by the input of current-limiting resistance R2 and control chip, and an output end of control chip is by switching two poles
Pipe D3 is connected with controllable silicon Q1 control pole, and controllable silicon Q1 anode is connected by commutation diode D1 with tripping coil, and it is cloudy
Pole is connected with zero line, and tripping coil links with de- mouth mechanism, and commutation diode D2 positive pole is connected with ground wire, the series connection point of its negative pole
Piezoresistance R11 and divider resistance R12 are followed by zero line, and switching diode D5 positive pole is connected on divider resistance R11 and divider resistance
R12 junction, its negative pole is connected with controllable silicon Q1 control pole.
2. the control circuit of the earth leakage protective device of the double protections of ground wire according to claim 1, it is characterised in that also including heat
Quick detection module, temperature-sensitive detection module is connected by switching diode D4 with controllable silicon Q1 control pole.
3. the control circuit of the earth leakage protective device of the double protections of ground wire according to claim 2, it is characterised in that described heat
Quick detection module includes thermistor RT, divider resistance R4 and divider resistance R5, thermistor RT and divider resistance R4, partial pressure electricity
Filter capacitor C6 two ends are hindered after R5 series connection and are connected to, switching diode D4 positive pole is connected on thermistor RT and divider resistance
At R5 tie point, its negative pole is connected with controllable silicon Q1 control pole.
4. the control circuit of the earth leakage protective device of the double protections of ground wire according to claim 3, it is characterised in that described heat
Quick resistance RT uses negative tempperature coefficient thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720063531.4U CN206412749U (en) | 2017-01-19 | 2017-01-19 | The control circuit of the earth leakage protective device of the double protections of ground wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720063531.4U CN206412749U (en) | 2017-01-19 | 2017-01-19 | The control circuit of the earth leakage protective device of the double protections of ground wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206412749U true CN206412749U (en) | 2017-08-15 |
Family
ID=59555448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720063531.4U Active CN206412749U (en) | 2017-01-19 | 2017-01-19 | The control circuit of the earth leakage protective device of the double protections of ground wire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206412749U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
-
2017
- 2017-01-19 CN CN201720063531.4U patent/CN206412749U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658843A (en) * | 2017-10-23 | 2018-02-02 | 江西美的贵雅照明有限公司 | Overvoltage crowbar and light fixture |
| CN107658843B (en) * | 2017-10-23 | 2023-11-14 | 美智光电科技股份有限公司 | Overvoltage protection circuit and lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201026 Address after: Second floor, No.10 Xinfu Road, Xiaoli community, Dongfeng Town, Zhongshan City, Guangdong Province Patentee after: Zhongshan grace Electronic Co., Ltd Address before: 528400 Guangdong city of Zhongshan Province Dongfeng Town Lek Village new Fu Road No. 10 Patentee before: ZHONGSHAN GRACE ELECTRIC Co.,Ltd. |