CN209562140U - A type leakage protection circuit - Google Patents
A type leakage protection circuit Download PDFInfo
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- CN209562140U CN209562140U CN201920397203.7U CN201920397203U CN209562140U CN 209562140 U CN209562140 U CN 209562140U CN 201920397203 U CN201920397203 U CN 201920397203U CN 209562140 U CN209562140 U CN 209562140U
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Abstract
The utility model relates to electric leakage protection technology fields; especially disclose a kind of A type leakage protection circuit; including mutual inductor, current rectifying and wave filtering circuit module, A type electric leakage signal detection module, A type electric leakage signal processing module, trip circuit module and leakage experiment circuit module; the leakage experiment circuit module includes resistance R3 and experiment button KEY; wherein one end of resistance R3 is connected on firewire L; the other end is connect after passing through mutual inductor with experiment button KEY, and the other end of experiment button KEY is connected on zero curve N.Using the above structure, provide it is a kind of can decision circuitry whether work normally, avoid the A type leakage protection circuit for threatening the thing of personal safety to occur due to circuit damages and causes tripping.
Description
Technical field
The utility model relates to electric leakage protection technology field, especially a kind of A type leakage protection circuit.
Background technique
Currently, in the market it is most be AC type earth leakage circuit breaker, with the rise of the technologies such as charging pile, to electric leakage
Testing requirements also increase accordingly because not only having AC type in the electric leakage signal of the occasions such as charging pile, also there is pulsating direct current
Type, and conventional AC type earth leakage protective device cannot detect the electric leakage signal of pulsating direct current type, lead to tripping occur, seriously affect
The personal safety of user or the safety of equipment.And A type earth leakage circuit breaker is sinusoidal to the unexpected electric leakage for applying or slowly rising
Alternating current and pulsating direct current electric current can ensure that action message, can greatly improve charging pile charging process safety and can
By property.
Based on few breakers with DC leakage signal protection in the market, even if having, cost is also very high, and such as China is special
Application No. is a kind of A type electric leakage guarantor is disclosed in a kind of 201611220271.3 alternating-current charging pile A type leakage protection circuit for benefit
Protection circuit is shown in attached drawing 1, which is handled electric leakage signal using A type electric leakage chip, uses relay as buckle releaser
Part, when there is electric leakage to occur, electric leakage chip, which issues signal, leads to controlled silicon conducting, and metal-oxide-semiconductor Q1 and Q4 are connected, Q2 cut-off, thus
So that relay is threaded off, although this circuit realizes A type creepage protection function, but do not have hookup, can not decision circuitry whether
It works normally, and the electric leakage chip TPA4128 model used is old, compares and be hard to buy and price is higher, in addition to this, electric leakage
Trip circuit is too complicated, 3 metal-oxide-semiconductors and the 1 silicon-controlled control switched to relay has been used, in addition relay itself
Price is relatively high, and generally speaking, this scheme cost is too high to be difficult to be widely used to promote.
Utility model content
In order to overcome the deficiencies of the prior art, the utility model provides it is a kind of can decision circuitry whether work normally, keep away
Exempt from the A type leakage protection circuit for threatening the thing of personal safety to occur because circuit damage causes tripping.
To achieve the goals above, the technical solution adopted in the utility model is: a kind of A type leakage protection circuit, including
Mutual inductor, current rectifying and wave filtering circuit module, A type electric leakage signal detection module, A type electric leakage signal processing module and trip circuit mould
Block further includes leakage experiment circuit module, and the leakage experiment circuit module includes resistance R3 and experiment button KEY, wherein electricity
One end of resistance R3 is connected on firewire L, and the other end is connect after passing through mutual inductor with experiment button KEY, and experiment button KEY's is another
End is connected on zero curve N.
In above-mentioned technical proposal, when experiment button KEY is pressed, it is equivalent to simulate a certain size leakage current, it can
Whether worked normally with decision circuitry in this way, caused by frequent test experiments button KEY can be to avoid damaging because of circuit
Tripping and threaten the thing of personal safety to occur, improve the safety and reliability of circuit.
It further include decompression voltage regulator module as the further setting of the utility model, the decompression voltage regulator mould
Block includes resistance R7, resistance R8, resistance R9, resistance R10 and zener diode VZ1, is wherein connected after R7, R8, R9, R10 series connection
To 8 feet of cathode and A type electric leakage the chip U1 of zener diode VZ1, the plus earth of zener diode VZ1.
As the further setting of the utility model, the A type electric leakage signal processing module include A type electric leakage chip U1,
Capacitor C2, capacitor C1 and capacitor C4, one end of capacitor C2 are connected to 8 feet of A type electric leakage chip U1, other end ground connection, capacitor C1
One end be connected to 6 feet of A type electric leakage chip U1, other end ground connection, one end of capacitor C4 is connected to A type electric leakage chip U1
7 feet, other end ground connection.
As the further setting of the utility model, the model FM2147 of the A type electric leakage chip U1.
In above-mentioned technical proposal, A type leaks electricity chip U1 using newest A cake core FM2147 in the market, is easy buying, property
It can stablize, it is cheap.
As the further setting of the utility model, the trip circuit module includes silicon-controlled Q1, capacitor C3 and tripping
Device L1, wherein the one end buckle releaser L1 is connected on zero curve N, and the other end is connected with the anode of silicon-controlled Q1, the cathode of silicon-controlled Q1
Ground connection, the control electrode of silicon-controlled Q1 are connected to 5 feet of A type electric leakage chip U1.
In above-mentioned technical proposal, it is only necessary to which silicon-controlled to realize tripping function, component is few, and circuit cost is low, property
It can stablize.
As the further setting of the utility model, the A type electric leakage signal detection module include capacitor C7, resistance R6,
Clamp diode VD5, resistance R2, resistance R5, filter capacitor C8 and filter capacitor C9, wherein capacitor C7, resistance R6 and clamper two
Pole pipe VD5 is parallel to two output ends of mutual inductor, and one end of filter capacitor C8 and filter capacitor C9 are connected to clamper two
The other end of the both ends of pole pipe VD5, filter capacitor C8 and filter capacitor C9 are grounded, the input terminal point of the resistance R2 and resistance R5
It is not connected on the both ends of clamp diode VD5, the output end of resistance R2 and resistance R5 are connected to the 3 of A type electric leakage chip U1
On foot and 2 feet, capacitor C6 is connected in parallel on the output end of resistance R2 and resistance R5.
As the further setting of the utility model, the current rectifying and wave filtering circuit module includes varistor MYR1, two poles
Pipe VD1, diode VD2, diode VD3, diode VD4, resistance R4 and capacitor C5, wherein the both ends connection of varistor MYR1
Onto firewire L and zero curve N, diode VD1, diode VD2, diode VD3 and diode VD4 constitute full-wave rectifying circuit, electricity
Resistance R4 is connected in parallel on full-wave rectifying circuit both ends after connecting with capacitor C5.
By using above scheme, it not only can detecte processing exchange AC type electric leakage signal, can be pulsed with detection processing
DC leakage signal can protect circuit when the A type electric leakage signal occurred in circuit reaches certain value.Furthermore originally
Circuit structure is simple, at low cost, and A type leaks electricity chip using powerful stable FM2147, and scheme is easily promoted, practical
Property is strong.When occurring A type electric leakage signal in route, breaker can be disconnected reliably, in special occasions such as charging piles, be avoided the occurrence of often
The phenomenon that advising earth leakage protective device tripping, i.e. the protection scope of the utility model circuit is wider, more secure and reliable.
The utility model is further described with reference to the accompanying drawing.
Detailed description of the invention
Attached drawing 1 is the circuit diagram of the prior art；
Attached drawing 2 is the flow diagram of the utility model specific embodiment；
Attached drawing 3 is the circuit diagram of the utility model specific embodiment.
Specific embodiment
Specific embodiment of the utility model is as Figure 2-3, a kind of A type leakage protection circuit, including mutual inductor, rectification
Filter circuit module, A type electric leakage signal detection module, A type electric leakage signal processing module and trip circuit module further include electric leakage
Experiment circuit module, the leakage experiment circuit module include resistance R3 and experiment button KEY, wherein one end connection of resistance R3
On firewire L, the other end is connect after passing through mutual inductor with experiment button KEY, and the other end of experiment button KEY is connected to zero curve N
On.Only need it is silicon-controlled can realize tripping function, component is few, and circuit cost is low, performance stablize.
Above-mentioned further includes decompression voltage regulator module, and the decompression voltage regulator module includes resistance R7, resistance R8, resistance
R9, resistance R10 and zener diode VZ1 are wherein connected to the cathode and A of zener diode VZ1 after R7, R8, R9, R10 series connection
8 feet of type electric leakage chip U1, the plus earth of zener diode VZ1.
Above-mentioned A type electric leakage signal processing module includes A type electric leakage chip U1, capacitor C2, capacitor C1 and capacitor C4, capacitor C2
One end be connected to 8 feet of A type electric leakage chip U1, other end ground connection, one end of capacitor C1 is connected to A type electric leakage chip U1
6 feet, other end ground connection, one end of capacitor C4 are connected to 7 feet of A type electric leakage chip U1, other end ground connection.
As the further setting of the utility model, the model FM2147 of the A type electric leakage chip U1.A type electric leakage core
Piece U1 is easy buying, performance is stablized, cheap using newest A cake core FM2147 in the market.
Above-mentioned trip circuit module includes silicon-controlled Q1, capacitor C3 and buckle releaser L1, and wherein the one end buckle releaser L1 is connected to
On zero curve N, the other end is connected with the anode of silicon-controlled Q1, and the control electrode of the minus earth of silicon-controlled Q1, silicon-controlled Q1 is connected to A
5 feet of type electric leakage chip U1.
Above-mentioned A type electric leakage signal detection module include capacitor C7, resistance R6, clamp diode VD5, resistance R2, resistance R5,
Filter capacitor C8 and filter capacitor C9, wherein capacitor C7, resistance R6 and clamp diode VD5 are parallel to two outputs of mutual inductor
One end of end, filter capacitor C8 and filter capacitor C9 are connected to the both ends of clamp diode VD5, filter capacitor C8 and filtering
The other end of capacitor C9 is grounded, and the input terminal of the resistance R2 and resistance R5 are connected on the both ends of clamp diode VD5 respectively, electricity
Resistance R2 and resistance R5 output end be connected to A type electric leakage chip U1 3 feet and 2 feet on, capacitor C6 be connected in parallel on resistance R2 and
The output end of resistance R5.
Above-mentioned current rectifying and wave filtering circuit module includes varistor MYR1, diode VD1, diode VD2, diode VD3, two
Pole pipe VD4, resistance R4 and capacitor C5, wherein the both ends of varistor MYR1 are connected on firewire L and zero curve N, diode VD1,
Diode VD2, diode VD3 and diode VD4 constitute full-wave rectifying circuit, and resistance R4 is connected in parallel on all-wave after connecting with capacitor C5
Rectification circuit both ends.AC type and pulsating direct current type electric leakage signal are referred to as A type electric leakage signal, using A type electric leakage chip, not only may be used
AC type electric leakage signal is exchanged with detection processing, it can be with detection processing pulsating direct current electric leakage signal, when the A type leakage occurred in circuit
When electric signal reaches certain value, circuit can be protected.The maximum feature of this circuit is can not only to flow into ac leakage
Row protection, can also protect pulsating direct current electric leakage signal；Furthermore this circuit structure is simple, at low cost, chip using
Powerful stable FM2147, scheme is easily promoted, practical.
Circuit theory: 230V alternating current is rectified by full-wave rectifying circuit, after being filtered by resistance R4 and capacitor C5,
It is connected to silicon-controlled Q1 anode tap, silicon-controlled Q1 minus earth all the way, control electrode is connected to 5 feet of A type electric leakage chip U1, while another
Road is by resistance R7, resistance R8, resistance R9 and resistance R10 decompression, and after zener diode VZ1 pressure stabilizing, formation+5V power supply gives A type
The chip U1 that leaks electricity powers.When it is transformer induced have leakage current into circuit when, mutual inductor pair side generate a voltage, this voltage warp
Resistance R6 and filter capacitor C7 are overregulated, clamp diode VD5 clamper is then passed through, is input to A type after adjusting using filtering
Leak electricity chip U1, and when the signal that A type electric leakage chip U1 is received is greater than the threshold values of setting, 5 feet of A type electric leakage chip U1 can be defeated
A high level out, this high level can be such that silicon-controlled Q1 is connected, so that allowing on buckle releaser L1 has electric current to pass through, circuit breaker trip
Carry out earth leakage protective.In addition, circuit is also provided with experiment button circuit, the one end resistance R3 is connected on firewire L, and the other end passes through
It is connected to after mutual inductor on experiment button KEY, the experiment button KEY other end is connected on the zero curve N of circuit, when experiment button
When KEY is pressed, it is equivalent to simulate a certain size leakage current, it can the whether normal work of decision circuitry in this way
Make, frequent test experiments button KEY can threaten the thing of personal safety to occur to avoid because circuit damage causes tripping.
The utility model is not limited to above-mentioned specific embodiment, and persons skilled in the art are according to the utility model public affairs
The content opened can be implemented the utility model or all using the utility model using other a variety of specific embodiments
Design structure and thinking, do simple change or change, both fall within the protection scope of the utility model.
Claims (7)
1. a kind of A type leakage protection circuit, including mutual inductor, current rectifying and wave filtering circuit module, A type electric leakage signal detection module, A type
Electric leakage signal processing module and trip circuit module, it is characterised in that: further include leakage experiment circuit module, the leakage experiment
Circuit module includes resistance R3 and experiment button KEY, and wherein one end of resistance R3 is connected on firewire L, and the other end passes through mutual inductance
It is connect after device with experiment button KEY, the other end of experiment button KEY is connected on zero curve N.
2. A type leakage protection circuit according to claim 1, it is characterised in that: further include decompression voltage regulator module, institute
Stating decompression voltage regulator module includes resistance R7, resistance R8, resistance R9, resistance R10 and zener diode VZ1, wherein resistance R7,
It is connected to the cathode of zener diode VZ1 and 8 feet of A type electric leakage chip U1 after resistance R8, resistance R9 and resistance R10 series connection, surely
Press the plus earth of diode VZ1.
3. A type leakage protection circuit according to claim 1 or 2, it is characterised in that: the A type electric leakage signal handles mould
Block includes A type electric leakage chip U1, capacitor C2, capacitor C1 and capacitor C4, and one end of capacitor C2 is connected to the 8 of A type electric leakage chip U1
Foot, other end ground connection, one end of capacitor C1 are connected to 6 feet of A type electric leakage chip U1, and one end of other end ground connection, capacitor C4 connects
Connect 7 feet in A type electric leakage chip U1, other end ground connection.
4. A type leakage protection circuit according to claim 3, it is characterised in that: the model of the A type electric leakage chip U1
FM2147。
5. A type leakage protection circuit according to claim 3, it is characterised in that: the trip circuit module includes controllable
Silicon Q1, capacitor C3 and buckle releaser L1, wherein the one end buckle releaser L1 is connected on zero curve N, the anode phase of the other end and silicon-controlled Q1
Even, the minus earth of silicon-controlled Q1, the control electrode of silicon-controlled Q1 are connected to 5 feet of A type electric leakage chip U1.
6. A type leakage protection circuit according to claim 4 or 5, it is characterised in that: the A type electric leakage signal detects mould
Block includes capacitor C7, resistance R6, clamp diode VD5, resistance R2, resistance R5, filter capacitor C8 and filter capacitor C9, wherein electricity
Hold C7, resistance R6 and clamp diode VD5 are parallel to two output ends of mutual inductor, the one of filter capacitor C8 and filter capacitor C9
End is connected to the both ends of clamp diode VD5, the other end ground connection of filter capacitor C8 and filter capacitor C9, the resistance R2
It is connected on the both ends of clamp diode VD5 respectively with the input terminal of resistance R5, the output end of resistance R2 and resistance R5 are separately connected
On 3 feet and 2 feet of A type electric leakage chip U1, the both ends of capacitor C6 are connected to the output end of resistance R2 and resistance R5.
7. A type leakage protection circuit described according to claim 1 or 2 or 4 or 5, it is characterised in that: the current rectifying and wave filtering circuit
Module includes varistor MYR1, diode VD1, diode VD2, diode VD3, diode VD4, resistance R4 and capacitor C5,
Wherein the both ends of varistor MYR1 are connected on firewire L and zero curve N, diode VD1, diode VD2, diode VD3 and two
Pole pipe VD4 constitutes full-wave rectifying circuit, and resistance R4 is connected in parallel on full-wave rectifying circuit both ends after connecting with capacitor C5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920397203.7U CN209562140U (en) | 2019-03-27 | 2019-03-27 | A type leakage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920397203.7U CN209562140U (en) | 2019-03-27 | 2019-03-27 | A type leakage protection circuit |
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| CN209562140U true CN209562140U (en) | 2019-10-29 |
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| CN201920397203.7U Active CN209562140U (en) | 2019-03-27 | 2019-03-27 | A type leakage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962456A (en) * | 2019-03-27 | 2019-07-02 | 德力西电气有限公司 | A type leakage protection circuit |
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2019
- 2019-03-27 CN CN201920397203.7U patent/CN209562140U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109962456A (en) * | 2019-03-27 | 2019-07-02 | 德力西电气有限公司 | A type leakage protection circuit |
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