CN206712447U - A kind of leakage protection circuit with overvoltage protection - Google Patents
A kind of leakage protection circuit with overvoltage protection Download PDFInfo
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- CN206712447U CN206712447U CN201720378560.XU CN201720378560U CN206712447U CN 206712447 U CN206712447 U CN 206712447U CN 201720378560 U CN201720378560 U CN 201720378560U CN 206712447 U CN206712447 U CN 206712447U
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Abstract
The utility model discloses a kind of leakage protection circuit with overvoltage protection, include shell, exchange input interface is provided with the shell and exchanges output interface, the exchange input interface is connected with leakage switch, the leakage switch is connected to the leakaging signal detecting circuit for detecting exchange input interface with exchanging leakage current between output interface, for detecting exchange input interface with exchanging between output interface the over-voltage detection circuit of drain voltage and according to leakaging signal detecting circuit, over-voltage detection circuit output signal come control leakage switch disconnect leakage switch trip circuit, make to disconnect leakage protection circuit power supply during exchange input interface high input voltage by over-voltage detection circuit, preferably ensure user's personal safety.
Description
[technical field]
It the utility model is related to a kind of leakage protection circuit with overvoltage protection.
[background technology]
At present, mobile leakage protector on the market is only in the case where detecting electric leakage, and just meeting deenergization connects,
But do not possessing over-voltage protecting function, i.e., input voltage is too high will not also cut power supply, it is impossible to guarantee personal safety.
[utility model content]
The utility model overcomes the deficiency of above-mentioned technology, there is provided a kind of drop point protection circuit with overvoltage protection.
To achieve the above object, the utility model employs following technical proposal：
A kind of leakage protection circuit with overvoltage protection, include shell 1, exchange input interface 2 is provided with the shell 1
With exchange output interface 3, the exchange input interface 2 is connected with leakage switch 4, and the leakage switch 4, which is connected to, to be used for
Detection exchange input interface 2 with exchange the leakaging signal detecting circuit 5 of leakage current between output interface 3, for detect exchange it is defeated
Incoming interface 2 is with exchanging between output interface 3 over-voltage detection circuit 6 of drain voltage and according to leakaging signal detecting circuit 5, overvoltage
The output signal of circuit 6 is detected to control the leakage switch trip circuit 7 that leakage switch 4 disconnects.
It is provided be used for whether testing creepage protection function between the exchange input interface 2 and leakaging signal detecting circuit 5
The hookup 8 of normal work.
The leakage switch 4 is connected with power supply light indicating circuit 9.
Thermistor 10 is provided between the exchange input interface 2 and leakage switch 4.
The leakaging signal detecting circuit 5 includes leakage indicator U1 and zero sequence current mutual inductor ZCT, the electric leakage inspection
Survey device U1 pins 1 to be connected with leakage switch trip circuit 7, the leakage indicator U1 pins 2 are grounded, the leakage indicator U1
Pin 3 is grounded by electric capacity C3, the leakage indicator U1 pins 4 respectively with electric capacity C5 one end, zero sequence current mutual inductor ZCT mono-
Output end connects, and electric capacity C5 other ends ground connection, the leakage indicator U1 pins 5 pass through resistance R4 and zero sequence current mutual inductor
Another output end connections of ZCT, the leakage indicator U1 pins 6 are connected by resistance R5 with leakage indicator U1 pins 5, described
Electric capacity C4 and resistance R2 are connected between the output ends of zero sequence current mutual inductor ZCT two.
The over-voltage detection circuit 6 includes voltage-regulator diode DZ1 and bidirectional trigger diode D2, the voltage-regulator diode
DZ1 positive terminals are grounded, and the voltage-regulator diode DZ1 negative pole ends are connected with electric capacity C3 one end, resistance R6 one end respectively, and electric capacity C3 is another
One end is grounded, and the resistance R6 other ends are connected with bidirectional trigger diode D2 one end, resistance R3 one end respectively, bidirectional trigger diode
The D2 other ends are connected with leakage switch trip circuit 7, and the resistance R3 other ends are connected with live wire.
The leakage switch trip circuit 7 includes controllable silicon SCR, bipolar tube D1 and for controlling leakage switch 4 to disconnect
Tripping coil L, the controllable silicon SCR anode tap is connected with tripping coil L one end, the tripping coil L other ends and live wire
Connection, the controllable silicon SCR cathode terminal respectively with zero line, be connected to ground, the controllable silicon SCR control terminal respectively with electric capacity C2 mono-
End, bipolar tube D1 pins 1 are connected, and the electric capacity C2 other ends are connected with ground, electric capacity C2 one end respectively, and the electric capacity C2 other ends are examined with overvoltage
Slowdown monitoring circuit 6 is connected, and the bipolar tube D1 pins 2 are connected with over-voltage detection circuit 6, the bipolar tube D1 pins 3 and electric leakage signal
Detection circuit 5 connects.
The hookup 8 includes test switch TESET and resistance R7, described test switch TESET one end and live wire
Connection, the test switch TESET other ends pass through the zero sequence current mutual inductor ZCT of leakaging signal detecting circuit 5 by resistance R7
It is connected with zero line.
The beneficial effects of the utility model are：
The utility model has detection of electrical leakage and over-voltage protecting function, is higher than in leakaging signal detecting circuit detection leakage current
Setting value or over-voltage detection circuit detection input voltage be higher than setting value when, leakage switch trip circuit deenergization connect,
Preferably play a protective role, ensure the personal safety of user.
[brief description of the drawings]
Fig. 1 is the utility model schematic diagram；
Fig. 2 is the utility model circuit diagram.
[embodiment]
It is described in further detail below in conjunction with the accompanying drawings with embodiment of the present utility model：
As shown in figure 1, a kind of leakage protection circuit with overvoltage protection, includes shell 1, is provided with and hands in the shell 1
Stream input interface 2 is connected with leakage switch 4 with output interface 3, the exchange input interface 2 is exchanged, and the leakage switch 4 is distinguished
It is connected with for detecting exchange input interface 2 and exchanging the leakaging signal detecting circuit 5 of leakage current between output interface 3, be used for
Detection exchange input interface 2 is with exchanging between output interface 3 over-voltage detection circuit 6 of drain voltage and being detected according to electric leakage signal
Circuit 5, the output signal of over-voltage detection circuit 6 come control leakage switch 4 disconnect leakage switch trip circuit 7.
When the detection leakage current value of leakaging signal detecting circuit 5 and detection of electrical leakage value is higher than leakage current setting value, overvoltage
When the detection detection input voltage value of circuit 6 is higher than input voltage setting value, leakage switch trip circuit 7, which is threaded off, makes leakage switch 4
Disconnect.
It is provided be used for whether testing creepage protection function between the exchange input interface 2 and leakaging signal detecting circuit 5
The hookup 8 of normal work, the leakage switch 4 are connected with power supply light indicating circuit 9, are used to indicate whether the logical of power supply
It is disconnected, it is provided with thermistor 10 between the exchange input interface 2 and leakage switch 4.
Wherein, the leakaging signal detecting circuit 5 includes leakage indicator U1 and is enclosed on live wire, the zero sequence electricity on zero line
Current transformer ZCT, the leakage indicator U1 pins 1 are connected with leakage switch trip circuit 7, the leakage indicator U1 pins
2 ground connection, the leakage indicator U1 pins 3 are grounded by electric capacity C3, the leakage indicator U1 pins 4 respectively with electric capacity C5 mono-
End, the connection of the output ends of zero sequence current mutual inductor ZCT mono-, electric capacity C5 other ends ground connection, the leakage indicator U1 pins 5 pass through electricity
Resistance R4 is connected with another output ends of zero sequence current mutual inductor ZCT, and the leakage indicator U1 pins 6 are examined by resistance R5 and electric leakage
Survey device U1 pins 5 to connect, electric capacity C4 and resistance R2 are connected between the output ends of zero sequence current mutual inductor ZCT two.
The over-voltage detection circuit 6 includes voltage-regulator diode DZ1 and bidirectional trigger diode D2, the voltage-regulator diode
DZ1 positive terminals are grounded, and the voltage-regulator diode DZ1 negative pole ends are connected with electric capacity C3 one end, resistance R6 one end respectively, and electric capacity C3 is another
One end is grounded, and the resistance R6 other ends are connected with bidirectional trigger diode D2 one end, resistance R3 one end respectively, bidirectional trigger diode
The D2 other ends are connected with leakage switch trip circuit 7, and the resistance R3 other ends are connected with live wire.
The leakage switch trip circuit 7 includes controllable silicon SCR, bipolar tube D1 and for controlling leakage switch 4 to disconnect
Tripping coil L, the controllable silicon SCR anode tap is connected with tripping coil L one end, the tripping coil L other ends and live wire
Connection, the controllable silicon SCR cathode terminal respectively with zero line, be connected to ground, the controllable silicon SCR control terminal respectively with electric capacity C2 mono-
End, bipolar tube D1 pins 1 are connected, and the electric capacity C2 other ends are connected with ground, electric capacity C2 one end respectively, and the electric capacity C2 other ends are examined with overvoltage
Slowdown monitoring circuit 6 is connected, and the bipolar tube D1 pins 2 are connected with over-voltage detection circuit 6, the bipolar tube D1 pins 3 and electric leakage signal
Detection circuit 5 connects.
The hookup 8 includes test switch TESET and resistance R7, described test switch TESET one end and live wire
Connection, the test switch TESET other ends pass through the zero sequence current mutual inductor ZCT of leakaging signal detecting circuit 5 by resistance R7
It is connected with zero line.
Operation principle is as follows：
Press leakage switch 4 to work, when exchanging the live wire output current in output interface 3 with exchanging in input interface 2
When zero line input current is unequal, the zero sequence current mutual inductor ZCT in leakaging signal detecting circuit 5, which can sense, produces a telecommunications
Number, it is transferred to leakage indicator U1 through electric capacity C4, resistance R2, resistance R4, resistance R5 and is compared, electric signal passes through amplification ratio
Compared with when detection current value is more than current setting value, leakage indicator U1, which exports a trigger signal, makes leakage switch dropout electricity
Controllable silicon SCR conducting in road 7, tripping coil L, which produces electromagnetic induction power and realizes to thread off, disconnects leakage switch 4, cuts off the electricity supply.
In the case where pressing the normal operation of leakage switch 4, by triggering the tests of the test switch TESET in hookup 8
Whether leakage protection circuit function is normal, in leakage protection circuit normal work, when test switch TESET is pressed, hands over
The live wire output current flowed in output interface 3 is unequal with exchanging the zero line input current in input interface 2, and leakage switch is threaded off
Circuit 7, which is threaded off, disconnects leakage switch 4, deenergization, otherwise leakage protection circuit function cisco unity malfunction.
On the other hand, the input voltage in over-voltage detection circuit 6 detects exchange input interface 2 is higher than setting voltage
When, the bidirectional trigger diode D2 conducting controllable silicon SCR conducting tripping coils L in over-voltage detection circuit 6 produces electromagnetic induction power
Realize to thread off and disconnect leakage switch 4, cut off the electricity supply, play a protective role.
Claims (8)
- A kind of 1. leakage protection circuit with overvoltage protection, it is characterised in that：Include shell (1), be provided with the shell (1) Exchange input interface (2) is connected with leakage switch (4), the leakage with output interface (3), the exchange input interface (2) is exchanged Electric switch (4) is connected to for detecting exchange input interface (2) and exchanging the electric leakage letter of leakage current between output interface (3) Number detection circuit (5), for detect exchange input interface (2) and exchange the overvoltage of drain voltage between output interface (3) detect it is electric Road (6) and according to leakaging signal detecting circuit (5), over-voltage detection circuit (6) output signal come control leakage switch (4) disconnect Leakage switch trip circuit (7).
- A kind of 2. leakage protection circuit with overvoltage protection according to claim 1, it is characterised in that：The exchange input Between interface (2) and leakaging signal detecting circuit (5) be provided be used for test creepage protection function whether normal work experiment electricity Road (8).
- A kind of 3. leakage protection circuit with overvoltage protection according to claim 1, it is characterised in that：The leakage switch (4) it is connected with power supply light indicating circuit (9).
- A kind of 4. leakage protection circuit with overvoltage protection according to claim 1, it is characterised in that：The exchange input Thermistor (10) is provided between interface (2) and leakage switch (4).
- A kind of 5. leakage protection circuit with overvoltage protection according to claim 1, it is characterised in that：The electric leakage signal Detection circuit (5) includes leakage indicator U1 and zero sequence current mutual inductor ZCT, the leakage indicator U1 pins 1 and electric leakage Switch trip circuit (7) is connected, and the leakage indicator U1 pins 2 are grounded, and the leakage indicator U1 pins 3 pass through electric capacity C3 Ground connection, the leakage indicator U1 pins 4 are connected with electric capacity C5 one end, the output ends of zero sequence current mutual inductor ZCT mono- respectively, electric capacity The C5 other ends are grounded, and the leakage indicator U1 pins 5 are connected by another output ends of resistance R4 and zero sequence current mutual inductor ZCT Connect, the leakage indicator U1 pins 6 are connected by resistance R5 with leakage indicator U1 pins 5, the zero sequence current mutual inductor Electric capacity C4 and resistance R2 are connected between the output ends of ZCT two.
- A kind of 6. leakage protection circuit with overvoltage protection according to claim 1, it is characterised in that：The overvoltage detection Circuit (6) includes voltage-regulator diode DZ1 and bidirectional trigger diode D2, and the voltage-regulator diode DZ1 positive terminals ground connection is described Voltage-regulator diode DZ1 negative pole ends are connected with electric capacity C3 one end, resistance R6 one end respectively, electric capacity C3 other ends ground connection, and resistance R6 is another One end is connected with bidirectional trigger diode D2 one end, resistance R3 one end respectively, and the bidirectional trigger diode D2 other ends are opened with electric leakage Trip circuit (7) connection is closed, the resistance R3 other ends are connected with live wire.
- A kind of 7. leakage protection circuit with overvoltage protection according to claim 1, it is characterised in that：The leakage switch Trip circuit (7) includes controllable silicon SCR, bipolar tube D1 and the tripping coil L for controlling leakage switch (4) to disconnect, described Controllable silicon SCR anode tap is connected with tripping coil L one end, and the tripping coil L other ends are connected with live wire, the controllable silicon SCR cathode terminals respectively with zero line, be connected to ground, the controllable silicon SCR control terminal respectively with electric capacity C2 one end, bipolar tube D1 pins 1 connection, the electric capacity C2 other ends are connected with ground, electric capacity C2 one end respectively, and the electric capacity C2 other ends are connected with over-voltage detection circuit (6), The bipolar tube D1 pins 2 are connected with over-voltage detection circuit (6), the bipolar tube D1 pins 3 and leakaging signal detecting circuit (5) Connection.
- A kind of 8. leakage protection circuit with overvoltage protection according to claim 2, it is characterised in that：The hookup (8) test switch TESET and resistance R7 are included, described test switch TESET one end is connected with live wire, the test switch The TESET other ends are connected by resistance R7 through leakaging signal detecting circuit (5) zero sequence current mutual inductor ZCT with zero line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378560.XU CN206712447U (en) | 2017-04-12 | 2017-04-12 | A kind of leakage protection circuit with overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378560.XU CN206712447U (en) | 2017-04-12 | 2017-04-12 | A kind of leakage protection circuit with overvoltage protection |
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| Publication Number | Publication Date |
|---|---|
| CN206712447U true CN206712447U (en) | 2017-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720378560.XU Active CN206712447U (en) | 2017-04-12 | 2017-04-12 | A kind of leakage protection circuit with overvoltage protection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107910232A (en) * | 2017-12-18 | 2018-04-13 | 淄博职业学院 | A kind of Intelligent leakage protection switch |
| CN110896210A (en) * | 2018-09-12 | 2020-03-20 | 简树 | Single-phase electric leakage circuit breaker control system |
-
2017
- 2017-04-12 CN CN201720378560.XU patent/CN206712447U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107910232A (en) * | 2017-12-18 | 2018-04-13 | 淄博职业学院 | A kind of Intelligent leakage protection switch |
| CN110896210A (en) * | 2018-09-12 | 2020-03-20 | 简树 | Single-phase electric leakage circuit breaker control system |
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