CN110086146A - Applied to the overload protecting circuit in earth leakage protective socket - Google Patents
Applied to the overload protecting circuit in earth leakage protective socket Download PDFInfo
- Publication number
- CN110086146A CN110086146A CN201910478946.1A CN201910478946A CN110086146A CN 110086146 A CN110086146 A CN 110086146A CN 201910478946 A CN201910478946 A CN 201910478946A CN 110086146 A CN110086146 A CN 110086146A
- Authority
- CN
- China
- Prior art keywords
- current
- earth leakage
- line segment
- leakage protective
- protective socket
- 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.)
- Pending
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 40
- 229910001006 Constantan Inorganic materials 0.000 claims abstract description 40
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 40
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 24
- 229910052710 silicon Inorganic materials 0.000 description 24
- 239000010703 silicon Substances 0.000 description 24
- 230000005611 electricity Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
Abstract
The present invention provides a kind of overload protecting circuits applied in earth leakage protective socket, it includes constantan wire line segment, bidirectional triode thyristor, current-limiting resistance.Constantan wire line segment is connected in earth leakage protective socket power-supplying circuit power firestreak L or zero-power line N；One end of constantan wire line segment is connected with the main electrode of bidirectional triode thyristor, and the other end is connected through current-limiting resistance R4 with the control electrode of bidirectional triode thyristor；The switch electrode of bidirectional triode thyristor is connected through current-limiting resistance with the control terminal of the one-way SCR in leakage protection circuit.When the power load in earth leakage protective socket current supply circuit is larger; when electric current in current supply circuit is more than given threshold but is less than rated current; overload current forms pressure drop through constantan wire line segment; the pressure drop is through current-limiting resistance triggering bidirectional triode thyristor conducting; and then trigger leakage protection circuit work; power supply is cut off, the purpose of overload protection is played.
Description
Technical field
The present invention relates to a kind of overload protecting circuits applied in earth leakage protective socket or earth leakage circuit-breaker.
Background technique
Currently, power outlet/or power switch with creepage protection function have been widely used in various places.When with
When leaky occurs in electric equipment, the leakage protection circuit in earth leakage protective socket/or switch can act immediately, make earth leakage protective
Tripping mechanism movement in socket/or switch, cuts off power supply.
In general, as shown in Figure 1, leakage protection circuit mainly includes for detecting the differential coil T1 of leakage current, tripping
Coil T3, diode rectifier bridge D1-D4, unidirectional controllable silicon S CR.The function of diode rectifier bridge D1-D4 by AC rectification at
Direct current is unidirectional controllable silicon S CR power supply.The conducting wire being connected with unidirectional controllable silicon S CR control terminal pass through differential coil T1 after with list
It is connected to the cathode of controllable silicon SCR.Unidirectional controllable silicon S CR is connected in the current supply circuit of tripping coil T3.As differential coil T1
When detecting that leaky occurs in electrical equipment, unidirectional controllable silicon S CR conducting is triggered immediately, since unidirectional controllable silicon S CR is connected,
There is electric current to flow through in tripping coil T3, generate magnetic field, acts the tripping mechanism being built in tripping coil T3, and then make to connect
Switch K1 tripping in earth leakage protective socket or earth leakage circuit-breaker in power supply circuit, cuts off power supply.
Currently, various earth leakage protective sockets, the earth leakage circuit-breaker, leakage of the leaky research and development generated for electrical equipment
The technologies such as electric protection circuit are very mature.But every year because power load is excessive, power supply line's overheat, caused fire
Frequent occurrence, it is resulted in significant economic losses to the life of the people.In particular, winter, south is indoor without heating, some old
People, student use electric blanket, due to for a long time, more person-times be concentrated use in, cause supply current to increase and (but be not above power supply
The rated current of route), power supply line's overheat is small if it is some old residential building/dormitory building power supply line capacity, easily draws
Play fire.
Summary of the invention
In view of the foregoing, the object of the present invention is to provide one kind to be applied to earth leakage protective socket/or earth leakage circuit-breaker
Interior overload protecting circuit.When being more than the load current value that given threshold is less than design with the electric current in electrical circuit, cut automatically
Cut-off electricity circuit power.
To achieve the above object, the invention adopts the following technical scheme: a kind of overload applied in earth leakage protective socket
Protect circuit, it is characterised in that: it includes constantan wire line segment T2, bidirectional triode thyristor GHG1, the first current-limiting resistance R4, the second current limliting
Resistance R3；
The constantan wire line segment T2 is connected in earth leakage protective socket power-supplying circuit；
One end of the constantan wire line segment T2 is connected with the main electrode A1 of the bidirectional triode thyristor GHG1, described in other end warp
First current-limiting resistance R4 is connected with the control electrode G1 of the bidirectional triode thyristor GHG1；
The switch electrode B1 of the bidirectional triode thyristor GHG1 is through in the second current-limiting resistance R3 and leakage protection circuit
Unidirectional controllable silicon S CR control terminal is connected.
In a preferred embodiment of the present invention, the constantan wire line segment T2 is connected on the power supply of earth leakage protective socket power supply circuit
In firewire L.
In a preferred embodiment of the present invention, the constantan wire line segment T2 is connected on across leakage protection circuit differential coil
T1, the side power output end OUT power firestreak L in.
In a preferred embodiment of the present invention, the constantan wire line segment T2 is connected on earth leakage protective socket power input
In INPUT power firestreak L.
In a preferred embodiment of the present invention, the constantan wire line segment T2 is connected on the power supply of earth leakage protective socket power supply circuit
In zero curve N.
In a preferred embodiment of the present invention, the constantan wire line segment T2 is connected on across leakage protection circuit differential coil
T1, the side power output end OUT zero-power line N in.
In a preferred embodiment of the present invention, the constantan wire line segment T2 is connected on earth leakage protective socket power input
In INPUT zero-power line N.
In a preferred embodiment of the present invention, the main electricity of one end of the constantan wire line segment T2 and the bidirectional triode thyristor GHG1
Pole A1 is connected, and the other end passes through leakage protection circuit differential coil T1 through the first current-limiting resistance R4 and the bidirectional triode thyristor
The control electrode G1 of GHG1 is connected.
Detailed description of the invention
Fig. 1 is 1 physical circuit figure of overload protecting circuit embodiment of the present invention；
Fig. 2 is 2 physical circuit figure of overload protecting circuit embodiment of the present invention；
Fig. 3 is 3 physical circuit figure of overload protecting circuit embodiment of the present invention；
Fig. 4 is 4 physical circuit figure of overload protecting circuit embodiment of the present invention；
Fig. 5 is 5 physical circuit figure of overload protecting circuit embodiment of the present invention；
Fig. 6 is 6 physical circuit figure of overload protecting circuit embodiment of the present invention.
Specific embodiment
Structure and feature of the invention are described in detail with reference to the accompanying drawings and examples.It should be noted that can
To make various modifications to disclosed embodiments, therefore, embodiment disclosed in specification be should not be considered as to the present invention
Limitation, and only as the example of embodiment, the purpose is to keep feature of the invention apparent.
As shown in Figure 1, the overload protection electricity provided by the invention applied in earth leakage protective socket/or earth leakage circuit-breaker
Road includes constantan wire line segment T2, bidirectional triode thyristor GHG1, current-limiting resistance R4, current-limiting resistance R3.Constantan wire line segment T2 is connected on leakage
In electric protection socket power supply circuit, the main electrode A1 of one end TP2 and bidirectional triode thyristor GHG1 of constantan wire line segment T2 are connected, another
End TP1 is connected through current-limiting resistance R4 with the control electrode G1 of bidirectional triode thyristor GHG1；The switch electrode B1 of bidirectional triode thyristor GHG1 is passed through
Current-limiting resistance R3 is connected with the unidirectional controllable silicon S CR control terminal in leakage protection circuit.
When the power load in earth leakage protective socket current supply circuit is larger, the electric current (i.e. overload current) in current supply circuit is super
When crossing given threshold (depending on the concrete condition of electricity utilization site) but being less than load current value, overload current is through constantan wire line segment T2
Pressure drop is formed, which is connected through current-limiting resistance R4 triggering bidirectional triode thyristor GHG1, due to the conducting of bidirectional triode thyristor GHG1, touching
The unidirectional controllable silicon S CR conducting in leakage protection circuit is sent out, unidirectional controllable silicon S CR conducting makes have electric current stream in tripping coil T3
It crosses, generates magnetic field, which act the tripping mechanism being built in tripping coil T3, the power supply of cutting and tripping mechanism linkage
Switch K1 in circuit cuts off power supply, plays the purpose of overload protection.
In the embodiment of the present invention 1 shown in Fig. 1, constantan wire line segment T2 is connected on the electricity of earth leakage protective socket power supply circuit
In the firewire L of source.Certainly, constantan wire line segment T2 can also be connected in the zero-power line N of power supply circuit, as shown in Fig. 2, in this hair
In bright embodiment 2, constantan wire line segment T2 is connected in the zero-power line N of earth leakage protective socket power supply circuit, constantan wire line segment T2
One end TP2 be connected with the main electrode A1 of bidirectional triode thyristor GHG1, other end TP1 is through current-limiting resistance R4 and bidirectional triode thyristor GHG1
Control electrode G1 be connected；The switch electrode B1 of bidirectional triode thyristor GHG1 can through unidirectional in current-limiting resistance R3 and leakage protection circuit
Silicon SCR control end is controlled to be connected.Its working principle is identical with the embodiment of the present invention 1.
In Example 1 and Example 2 of the present invention, constantan wire line segment T2 is connected on the power supply output across differential coil T1
In the power firestreak L or zero-power line N for holding the side OUT, certainly, constantan wire line segment T2 can also be connected on earth leakage protective socket power supply
Input terminal INPUT, it does not pass through in the power firestreak L or zero-power line N of the side differential coil T1.
In the embodiment of the present invention 3 as shown in Figure 3, constantan wire line segment T2 is connected on earth leakage protective socket power input
In INPUT power firestreak L, the main electrode A1 of one end TP1 and bidirectional triode thyristor GHG1 of constantan wire line segment T2 are connected, the other end
TP2 is connected through current-limiting resistance R4 with the control electrode G1 of bidirectional triode thyristor GHG1；The switch electrode B1 of bidirectional triode thyristor GHG1 is through limiting
Leakage resistance R3 is connected with the unidirectional controllable silicon S CR control terminal in leakage protection circuit.Its working principle and embodiment 1, embodiment 2
It is identical.
Fig. 4 is 4 physical circuit figure of the embodiment of the present invention, as shown, constantan wire line segment T2 is connected on earth leakage protective socket
In power input INPUT zero-power line N, one end of the TP1 of constantan wire line segment T2 and the main electrode A1 of bidirectional triode thyristor GHG1
It is connected, other end TP2 is connected through current-limiting resistance R4 with the control electrode G1 of bidirectional triode thyristor GHG1；The switch of bidirectional triode thyristor GHG1
Electrode B 1 is connected through current-limiting resistance R3 with the unidirectional controllable silicon S CR control terminal in leakage protection circuit.Its working principle and implementation
Example 1, embodiment 2, embodiment 3 are identical.
Fig. 5 is 5 physical circuit figure of the embodiment of the present invention, as shown, constantan wire line segment T2 is connected on earth leakage protective socket
In power input INPUT power firestreak L, the main electrode A1 phase of one end TP1 and bidirectional triode thyristor GHG1 of constantan wire line segment T2
Even, other end TP2 is connected through current-limiting resistance R4 with the control electrode G1 of bidirectional triode thyristor GHG1 after passing through differential coil T1；It is two-way can
The switch electrode B1 of control silicon GHG1 is connected through current-limiting resistance R3 with the unidirectional controllable silicon S CR control terminal in leakage protection circuit.Its
Working principle is identical as 1~embodiment of embodiment 4.
Fig. 6 is 6 physical circuit figure of the embodiment of the present invention, as shown, constantan wire line segment T2 is connected on earth leakage protective socket
In power input INPUT zero-power line N, the main electrode A1 phase of one end TP1 and bidirectional triode thyristor GHG1 of constantan wire line segment T2
Even, other end TP2 is connected through current-limiting resistance R4 with the control electrode G1 of bidirectional triode thyristor GHG1 after passing through differential coil T1；It is two-way can
The switch electrode B1 of control silicon GHG1 is connected through current-limiting resistance R3 with the unidirectional controllable silicon S CR control terminal in leakage protection circuit.Its
Working principle is identical as 1~embodiment of embodiment 5.
The present invention dexterously utilizes the constantan wire line segment sensing overload being connected in earth leakage protective socket power-supplying circuit
Electric current triggers bidirectional triode thyristor after the electric current in current supply circuit is more than the maximum load current that current supply circuit can bear, into
And trigger silicon-controlled in leakage protection circuit, make there is electric current to flow through in the tripping coil in leakage protection circuit, generate magnetic field,
The tripping mechanism being built in tripping coil is acted, power supply is cut off, plays the purpose of overload protection.
The maximum load current that the length for the constantan wire line segment T2 that the present invention selects, sectional area can be carried by current supply circuit
It determines.
For the pressure drop for avoiding constantan wire line segment T2 from generating, when triggering bidirectional triode thyristor GHG1 and unidirectional controllable silicon S CR, electricity
Stream is more than its threshold current, therefore, control electrode of the present invention in bidirectional triode thyristor GHG1 is connected with the control terminal of unidirectional controllable silicon S CR
Limited leakage resistance R4 and R3, trigger signal trigger silicon-controlled GHG1 and SCR after current-limiting resistance R4 and R3.
The resistance value of described current-limiting resistance R4, R3 are according to the pressure drop at the both ends constantan wire line segment T2, silicon-controlled GHG1 and SCR control
Depending on holding current threshold to calculate.
In a specific embodiment of the present invention, the present invention selects bidirectional triode thyristor GHG1 and unidirectional controllable silicon S CR control leakage
Whether the tripping coil T3 in electric protection circuit generates magnetic field, and then controls tripping mechanism movement, cuts off power supply, certainly,
Other controllable switch devices can also be selected.
Advantages of the present invention: ingenious in design, structure is simple, reliable operation.
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into
Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (8)
1. a kind of overload protecting circuit applied in earth leakage protective socket, it is characterised in that: it include constantan wire line segment (T2),
Bidirectional triode thyristor (GHG1), the first current-limiting resistance (R4), the second current-limiting resistance (R3)；
The constantan wire line segment (T2) is connected in earth leakage protective socket power-supplying circuit；
One end of the constantan wire line segment (T2) is connected with the main electrode (A1) of the bidirectional triode thyristor (GHG1), and the other end is through institute
The first current-limiting resistance (R4) is stated to be connected with the control electrode (G1) of the bidirectional triode thyristor (GHG1)；
The switch electrode (B1) of the bidirectional triode thyristor (GHG1) is through in second current-limiting resistance (R3) and leakage protection circuit
One-way SCR (SCR) control terminal be connected.
2. the overload protecting circuit according to claim 1 applied in earth leakage protective socket, it is characterised in that: the health
Copper wire line segment (T2) is connected in the power firestreak L of earth leakage protective socket power supply circuit.
3. the overload protecting circuit according to claim 2 applied in earth leakage protective socket, it is characterised in that: the health
Copper wire line segment (T2) is connected in the power firestreak L of leakage protection circuit differential coil T1, the side power output end OUT.
4. the overload protecting circuit according to claim 2 applied in earth leakage protective socket, it is characterised in that: the health
Copper wire line segment (T2) is connected in earth leakage protective socket power input (INPUT) power firestreak L.
5. the overload protecting circuit according to claim 1 applied in earth leakage protective socket, it is characterised in that: the health
Copper wire line segment (T2) is connected in the zero-power line N of earth leakage protective socket power supply circuit.
6. the overload protecting circuit according to claim 5 applied in earth leakage protective socket, it is characterised in that: the health
Copper wire line segment (T2) is connected in the zero-power line N of leakage protection circuit differential coil T1, the side power output end (OUT).
7. the overload protecting circuit according to claim 5 applied in earth leakage protective socket, it is characterised in that: the health
Copper wire line segment (T2) is connected in earth leakage protective socket power input (INPUT) zero-power line N.
8. being applied to the overload protecting circuit in earth leakage protective socket according to claim 4 or 7, it is characterised in that: institute
The one end for stating constantan wire line segment (T2) is connected with the main electrode (A1) of the bidirectional triode thyristor (GHG1), and the other end passes through electric leakage and protects
Protection circuit differential coil T1 is connected through first current-limiting resistance (R4) with the control electrode (G1) of the bidirectional triode thyristor (GHG1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910478946.1A CN110086146A (en) | 2019-06-03 | 2019-06-03 | Applied to the overload protecting circuit in earth leakage protective socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910478946.1A CN110086146A (en) | 2019-06-03 | 2019-06-03 | Applied to the overload protecting circuit in earth leakage protective socket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110086146A true CN110086146A (en) | 2019-08-02 |
Family
ID=67423377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910478946.1A Pending CN110086146A (en) | 2019-06-03 | 2019-06-03 | Applied to the overload protecting circuit in earth leakage protective socket |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110086146A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2715388Y (en) * | 2004-05-28 | 2005-08-03 | 贾春盛 | Multifunctional safety socket |
| CN200959515Y (en) * | 2006-09-01 | 2007-10-10 | 苏春文 | Power-supply and cable inleakage inspection protecting circuit |
| US20120287537A1 (en) * | 2011-05-11 | 2012-11-15 | Huadao Huang | Leakage detection protection circuit |
| CN202797885U (en) * | 2012-09-04 | 2013-03-13 | 季建丰 | Leakage protection switch circuit |
| CN103219702A (en) * | 2013-03-21 | 2013-07-24 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit capable of performing timed self-detection |
| CN204179638U (en) * | 2014-08-10 | 2015-02-25 | 常安集团有限公司 | A kind of residual current circuit breaker |
| CN104538954A (en) * | 2014-12-23 | 2015-04-22 | 黄华道 | Power supply device having overcurrent protection function and electric leakage protection function |
| CN105305374A (en) * | 2015-10-27 | 2016-02-03 | 黄金和 | Electric leakage detection protective circuit having precise overload protection function |
| CN210041311U (en) * | 2019-06-03 | 2020-02-07 | 黄华道 | Overload protection circuit applied in leakage protection socket |
-
2019
- 2019-06-03 CN CN201910478946.1A patent/CN110086146A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2715388Y (en) * | 2004-05-28 | 2005-08-03 | 贾春盛 | Multifunctional safety socket |
| CN200959515Y (en) * | 2006-09-01 | 2007-10-10 | 苏春文 | Power-supply and cable inleakage inspection protecting circuit |
| US20120287537A1 (en) * | 2011-05-11 | 2012-11-15 | Huadao Huang | Leakage detection protection circuit |
| CN202797885U (en) * | 2012-09-04 | 2013-03-13 | 季建丰 | Leakage protection switch circuit |
| CN103219702A (en) * | 2013-03-21 | 2013-07-24 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit capable of performing timed self-detection |
| CN204179638U (en) * | 2014-08-10 | 2015-02-25 | 常安集团有限公司 | A kind of residual current circuit breaker |
| CN104538954A (en) * | 2014-12-23 | 2015-04-22 | 黄华道 | Power supply device having overcurrent protection function and electric leakage protection function |
| CN105305374A (en) * | 2015-10-27 | 2016-02-03 | 黄金和 | Electric leakage detection protective circuit having precise overload protection function |
| CN210041311U (en) * | 2019-06-03 | 2020-02-07 | 黄华道 | Overload protection circuit applied in leakage protection socket |
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