CN107658846A - A type low-voltage leakage protector circuits - Google Patents
A type low-voltage leakage protector circuits Download PDFInfo
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- CN107658846A CN107658846A CN201711096087.7A CN201711096087A CN107658846A CN 107658846 A CN107658846 A CN 107658846A CN 201711096087 A CN201711096087 A CN 201711096087A CN 107658846 A CN107658846 A CN 107658846A
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- signal
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- voltage
- leakage
- module
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Classifications
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- 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
- H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
Abstract
The present invention relates to a kind of A types low-voltage leakage protector circuit, including signal sampling module, comparator, time delay module, simulation bistable circuit, leakage protection module.Using the A type low-voltage leakage protection circuits of this kind of circuit structure; electric circuit inspection is triggered into earth leakage protective output state by simulating bistable circuit to maintain; so that it is guaranteed that peripheral controllable silicon can be driven stable and reliably powered off, effectively leakage protection is played.Simultaneously; the simulation bistable circuit is simple for structure; it is in stable condition; reduce the overall complexity of circuit; moreover, the simulation bistable circuit has also incorporated in design while power on/off reset function, also increases the enabled control signal with the certain time-delay time all the way and carrys out filtering circuit interference that may be present in power up; circuit false triggering is prevented, further increases circuit overall work state and stability, reliability and security on earth leakage protective trip operation.
Description
Technical field
The present invention relates to power supply technique field, more particularly to electric leakage protection technology field, in particular to a kind of leakage of A types low pressure
Non-electricity protector circuit.
Background technology
Existing common A types circuit for electric leakage protector employs arteries and veins on earth leakage protective tripping operation control signal realization is triggered
Rush widening circuit and the electric leakage signal pulse stretching detected is controlled into drive module for the control signal of fixed pulse width, driving is outer
Enclose controllable silicon and disconnect system power supply, realize earth leakage protective.The problem of design is present is that the pulsewidth of stretch circuit broadening is consolidated
Fixed, the width duration time is to drive peripheral controllable silicon to power off, because the stable power-off of control controllable silicon needs to continue enough
Long time, therefore when being adapted to the individual of peripheral controllable silicon and model difference etc., the fixed pulse width time be present too short can not control
The risk that controllable silicon processed reliably powers off.Simultaneously as pulse stretcher circuit structure is relative complex, complicated structural theory enterprising one
Step reduces the overall reliability and stability of circuit, is particularly applied to such field of earth leakage protective, for security and can
Require high by property.
The Chinese patent of Patent No. 200910247438.9 discloses a kind of earth leakage protective device (referring to Fig. 1), including：
Amplifier (101), rectifier (102), signal detector (103), comparator (104), impulse generator (105), electric current driving
Device (106).The electric leakage signal pulse stretching detected is come for the control signal of fixed pulse width which employs stretch circuit
Drive module is controlled, driving controllable silicon disconnects system power supply, but the control signal duration of the driving periphery controllable silicon deposits
Random or too short the problem of, due to the stable power-off of control controllable silicon need it is long enough therefore outer in adaptation
When enclosing individual and model difference of controllable silicon etc., the fixed pulse width time too short wind that controllable silicon can not be controlled reliably to power off be present
Danger.Simultaneously as the electric leakage signal duration is random, and pulse stretcher circuit structure is relative complex, complicated structure it is actual enter
One step reduces the overall reliability and stability of circuit, is particularly applied to such field of earth leakage protective, for security and
Reliability requirement is high.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming above-mentioned prior art, there is provided one kind can realize earth leakage protective A
Type low-voltage leakage protector circuit.
To achieve these goals, A type low-voltage leakage protectors circuit of the invention has following form：
The A type low-voltage leakage protector circuits, it is mainly characterized in that, the electricity of described A type low-voltage leakage protector circuits
Line structure includes：
Signal sampling module, for receiving electric leakage signal, and export detection signal；
Comparator, for exporting earth leakage protective comparison signal, the input of the comparator and described signal sampling module
Output end be connected；
Time delay module, for filtering interference signals, and exported after described earth leakage protective comparison signal is entered into line delay, should
The input of time delay module is connected with the output end of described comparator；
Simulate bistable circuit, for keep through time delay module export earth leakage protective comparison signal, and receive one when
Reset signal caused by clock enable signal and electrification reset module, the input of the simulation bistable circuit and described delay
The output end of module is connected；
Leakage protection module, for realizing earth leakage protective, the input of the leakage protection module and described simulation bistable
The output end of state circuit is connected.
The signal sampling module of the A type low-voltage leakage protector circuits includes：
Amplifier, for receiving electric leakage signal, and export amplified signal；
Rectifier, for receiving described amplified signal and the amplified signal being carried out into rectification to export rectified signal；
Signal detector, for receiving and detecting the rectified signal, and export detection signal.
Detection signal described in the positive level input input of the comparator of the A type low-voltage leakage protector circuits, it is described
The negative input input bandgap voltage reference of comparator.
The output of the time delay module of the A type low-voltage leakage protector circuits terminates an electric capacity.
It is laggard that the rectified signal is converted to DC level signal by the signal detector of the A type low-voltage leakage protector circuits
Row detection.
The rectified signal of the A type low-voltage leakage protector circuits is ac leakage signal.
The leakage protection module of the A type low-voltage leakage protector circuits is specially tripping controller, described tripping operation control
The switch that device controls external relay by simulating the earth leakage protective state that bistable circuit is kept to be used for.
The tripping controller of the A type low-voltage leakage protector circuits includes driver, for driving earth leakage circuit-breaker.Should
A type low-voltage leakage protector circuits leakage protection module control external relay cut off the electricity supply power supply when, described simulation
Bistable circuit departs from the earth leakage protective state kept.
The A type low-voltage leakage protector circuits in the present invention are employed, are touched electric circuit inspection by simulating bistable circuit
Sending out output state earth leakage protective maintains, so that it is guaranteed that peripheral controllable silicon can be driven stable and reliably powered off, has played
Effect ground leakage protection.It is in stable condition meanwhile simulation bistable circuit is simple for structure, the overall complexity of circuit is reduced,
Moreover, the simulation bistable circuit has also incorporated electrification reset, power-off reset function in design, can be by interference signal
Filtered out.The enabled control signal with the certain time-delay time all the way is also add in the simulation bistable circuit structure to filter
Except circuit, the interference that may be present in power up, prevents circuit false triggering, further increases circuit overall work state
And stability, reliability and security on earth leakage protective trip operation.
Brief description of the drawings
Fig. 1 is the electrical block diagram of circuit for electric leakage protector in the prior art.
Fig. 2 is the electrical block diagram of the A type low-voltage leakage protector circuits of the present invention.
Fig. 3 is the particular circuit configurations schematic diagram of the A type low-voltage leakage protector circuits of the present invention.
Embodiment
In order to more clearly describe the technology contents of the present invention, carried out with reference to specific embodiment further
Description.
Refer to shown in Fig. 2, it is the electrical block diagram of the A type low-voltage leakage protector circuits of the present invention, and it is wrapped
Include amplifier (201), rectifier (202), signal detector (203), comparator (204), time delay module (205), simulation bistable
State circuit (206), tripping controller (207), wherein, the magnitude of voltage of electric leakage signal of the amplifier to detecting produces after being amplified
Raw amplified signal, rectifier carries out rectification to the amplified signal of input, and adjusts amplified signal waveform and voltage amplitude scope, uses
In generation rectified signal.Signal detector detects to the crest voltage or RMS voltage of the rectified signal of input, can incite somebody to action
AC signal is converted into DC level signal, produces detection signal.Comparator is by the detection signal and bandgap voltage reference of input
It is compared, judges whether to trigger earth leakage protective, output control signal.If judging, detection signal is more than bandgap voltage reference,
Output comparison signal (comparison signal is the pulse signal changed with electric leakage signal).Above-mentioned comparison signal is inputted to delay mould
Block, control time delay module produce certain delay time.Above-mentioned comparison signal exports after time delay module is delayed.If electric leakage signal
Non-interference signal, then remain to export effective comparison signal after being delayed.Bistable circuit is simulated, will be defeated after time delay module delay filtering
The effective ratio gone out maintains compared with signal condition, and the comparison signal state for ensureing to export after keeping is no longer by the shadow of input electric leakage signal
Ring, meanwhile, incorporate power on/off reset function in design, it is contemplated that circuit letter that may be present in power up
Number interference problem, cause the mistake latch of signal condition, so as to influence circuit allomeric function.Electricity is further increased in design
Road overall work state and stability, reliability and security on earth leakage protective trip operation.The signal shape of above-mentioned holding
State is exported to tripping controller, controls protection switch.When detecting leaky, power supply of cutting off the electricity supply, earth leakage protective is played
Effect.
In actual applications, the A types low-voltage leakage protector can be integrated on same chip, to improve the integrated of system
Degree.
Referring to shown in Fig. 3, it is the particular circuit configurations schematic diagram of the A type low-voltage leakage protector circuits of the present invention,
Its mainly include amplifier (201), rectifier (202), signal detector (203), comparator (204), time delay module (205),
Simulate bistable circuit (206), tripping controller (207) etc..Its input signal is to be leaked caused by the winding being wrapped on iron core
Electric signal (not shown), produces amplified signal after amplification.The amplifier uses switched capacitor amplifier structure, needs electricity
Road internal clock generator (213) produces clock signal, coordinates switching capacity amplifier to use.The rectifier is opened using complementation
Capacitor sampling circuit is closed, sampling clock controls switching capacity with clock (214) to amplify in time from circuit internal clock generator
Device structure produces.The rectifier carries out rectification to the amplitude range and waveform of the amplified signal of input, produces rectified signal.Through
After over commutation, the amplitude of rectified signal is relatively stable compared with the amplified signal, therefore for the different electric leakage of amplitude range
Signal, it is not necessary to be adjusted to the earth leakage protective triggering bandgap voltage reference of setting.The signal detector is examined for virtual value
Survey, above-mentioned rectified signal is inputted to signal detector, and by the electric leakage signal after rectification, (detection electric leakage signal is friendship to signal detector
Flow signal) equivalency transform be with input electric leakage signal Strength Changes DC level signal, for signal detection.The comparator
The bandgap voltage reference of negative terminal input bandgap reference voltage (210) output, anode input the detection signal.If the inspection of input
It is sufficiently large to survey signal voltage value, more than the bandgap reference voltage, then the output voltage of operational amplifier is overturn, it is defeated
Go out the effective comparison signal of earth leakage protective.The time delay module, can external capacitor (2051), it is to protect above-mentioned electric leakage to realize function
Exported again after effective comparison signal delay a period of time of shield output, play filtering interference signals, prevent unnecessary electric leakage from protecting
False triggering is protected, improves the reliability and stability of trip operation.The simulation bistable circuit will export effectively after delay
Comparison signal, i.e. earth leakage protective state maintain.The state control tripping controller of the holding takes trip operation, driving periphery
Controllable silicon disconnects system power supply.Meanwhile overall structure has incorporated electrification reset, i.e. power-off reset function in design, it is contemplated that
Circuit signal interference problem that may be present in power up, cause the mistake latch of signal condition, so as to influence circuit
The problem of allomeric function.Circuit overall work state and steady on earth leakage protective trip operation is further increased in design
Qualitative, reliability and security.The tripping controller, control external relay are cut off the electricity supply power supply, play earth leakage protective work(
Energy.While completing earth leakage protective action, simulation bistable circuit resets, and departs from hold mode.
In an embodiment, A type low-voltage leakage protector circuits of the invention also include：
Voltage clamping (208), by externally fed voltage clamping near the representative value of leakage protection circuit operating voltage；
Bias (209), the bias current needed for generation circuit internal work；
Bandgap reference voltage, it is conventional bandgap reference voltage structure, produces one with voltage change very little, zero-temperature coefficient
Bandgap voltage reference power supply road inside use；
Reference voltage (211), based on bandgap reference voltage, using the normal of electric resistance partial pressure combination amplifier negative feedback type
Known technology structure is advised, is used inside a series of obtained required reference voltage power supply roads；
Electrification reset circuit (212), to by including clock generator, control clock, simulation bistable circuit
Circuit element is initialized；
Clock generator is used to produce internal clocking, can mainly be realized by RC oscillators；
Clock module is controlled, for coordinating clock generator, the clock signal of frequency and phase needed for generation circuit work
Power supply uses inside road, and described control clock module is mainly used in coordinating amplifier, rectifier and signal detector one
Play work.
The A type low-voltage leakage protector circuits in the present invention are employed, are touched electric circuit inspection by simulating bistable circuit
Sending out output state earth leakage protective maintains, so that it is guaranteed that peripheral controllable silicon can be driven stable and reliably powered off, has played
Effect ground leakage protection.It is in stable condition meanwhile simulation bistable circuit is simple for structure, the overall complexity of circuit is reduced,
Moreover, the simulation bistable circuit has also incorporated electrification reset, power-off reset function in design, can be by interference signal
Filtered out.The enabled control signal with the certain time-delay time all the way is also add in the simulation bistable circuit structure to filter
Except circuit, the interference that may be present in power up, prevents circuit false triggering, further increases circuit overall work state
And stability, reliability and security on earth leakage protective trip operation.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings are considered as illustrative
It is and nonrestrictive.
Claims (9)
- A kind of 1. A types low-voltage leakage protector circuit, it is characterised in that the circuit of described A type low-voltage leakage protector circuits Structure includes：Signal sampling module, for receiving electric leakage signal, and export detection signal；Comparator, for exporting earth leakage protective comparison signal, the input of the comparator is defeated with described signal sampling module Go out end to be connected；Time delay module, for filtering interference signals, and exported after described earth leakage protective comparison signal is entered into line delay, the delay The input of module is connected with the output end of described comparator；Bistable circuit is simulated, for the earth leakage protective comparison signal for keeping exporting through time delay module, and one clock of reception makes Reset signal caused by energy signal and electrification reset module, the input of the simulation bistable circuit and described time delay module Output end be connected；Leakage protection module, earth leakage protective, the leakage protection module are powered and realize for controlling external relay to cut off the electricity supply Input be connected with the output end of described simulation bistable circuit.
- 2. A types low-voltage leakage protector circuit according to claim 1, it is characterised in that described signal sampling module Including：Amplifier, for receiving electric leakage signal, and export amplified signal；Rectifier, for receiving described amplified signal and the amplified signal being carried out into rectification to export rectified signal；Signal detector, for receiving and detecting the rectified signal, and export detection signal.
- 3. A types low-voltage leakage protector circuit according to claim 1, it is characterised in that the positive level of described comparator The described detection signal of input input, the negative input input bandgap voltage reference of described comparator.
- 4. A types low-voltage leakage protector circuit according to claim 1, it is characterised in that described time delay module it is defeated Go out one electric capacity of termination.
- 5. A types low-voltage leakage protector circuit according to claim 2, it is characterised in that described signal detector will The rectified signal is detected after being converted to DC level signal.
- 6. A types low-voltage leakage protector circuit according to claim 5, it is characterised in that described rectified signal is friendship Flow electric leakage signal.
- 7. A types low-voltage leakage protector circuit according to claim 1, it is characterised in that described leakage protection module Specially tripping controller, described tripping controller are used to control by simulating the earth leakage protective state that bistable circuit is kept The switch of external relay.
- 8. A types low-voltage leakage protector circuit according to claim 7, it is characterised in that described tripping controller bag Driver is included, for driving earth leakage circuit-breaker.
- 9. A types low-voltage leakage protector circuit according to claim 1, it is characterised in that when described earth leakage protective mould The external relay of block control cut off the electricity supply power supply when, described simulation bistable circuit departs from the earth leakage protective state kept.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711096087.7A CN107658846B (en) | 2017-11-09 | 2017-11-09 | A-type low-voltage leakage protector circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711096087.7A CN107658846B (en) | 2017-11-09 | 2017-11-09 | A-type low-voltage leakage protector circuit |
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| Publication Number | Publication Date |
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| CN107658846A true CN107658846A (en) | 2018-02-02 |
| CN107658846B CN107658846B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711096087.7A Active CN107658846B (en) | 2017-11-09 | 2017-11-09 | A-type low-voltage leakage protector circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193560A (en) * | 2018-09-05 | 2019-01-11 | 温州市新林微电子有限公司 | Anti-interference overriding binary channels earth leakage protective device |
| CN110571756A (en) * | 2019-09-30 | 2019-12-13 | 浙江大学 | low-power consumption anti-interference A-type leakage protector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4862312A (en) * | 1988-11-22 | 1989-08-29 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker with overcurrent protection |
| CN101752831A (en) * | 2009-12-25 | 2010-06-23 | 上海复旦微电子股份有限公司 | Electrical switch device and electricity leakage protective device |
| CN203166620U (en) * | 2013-01-25 | 2013-08-28 | 李绍荣 | Single-phase electric leakage switch capable of automatically changing phase sequence |
| CN205283091U (en) * | 2015-12-31 | 2016-06-01 | 浙江朗威微系统有限公司 | Application specific integrated circuit of A -type low -voltage leakage protector |
-
2017
- 2017-11-09 CN CN201711096087.7A patent/CN107658846B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4862312A (en) * | 1988-11-22 | 1989-08-29 | Mitsubishi Denki Kabushiki Kaisha | Circuit breaker with overcurrent protection |
| CN101752831A (en) * | 2009-12-25 | 2010-06-23 | 上海复旦微电子股份有限公司 | Electrical switch device and electricity leakage protective device |
| CN203166620U (en) * | 2013-01-25 | 2013-08-28 | 李绍荣 | Single-phase electric leakage switch capable of automatically changing phase sequence |
| CN205283091U (en) * | 2015-12-31 | 2016-06-01 | 浙江朗威微系统有限公司 | Application specific integrated circuit of A -type low -voltage leakage protector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193560A (en) * | 2018-09-05 | 2019-01-11 | 温州市新林微电子有限公司 | Anti-interference overriding binary channels earth leakage protective device |
| CN109193560B (en) * | 2018-09-05 | 2019-09-10 | 温州市新林微电子有限公司 | Anti-interference overriding binary channels earth leakage protective device |
| CN110571756A (en) * | 2019-09-30 | 2019-12-13 | 浙江大学 | low-power consumption anti-interference A-type leakage protector |
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| Publication number | Publication date |
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| CN107658846B (en) | 2023-10-20 |
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