CN104377647B - leakage protection circuit - Google Patents
leakage protection circuit Download PDFInfo
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- CN104377647B CN104377647B CN201410707631.7A CN201410707631A CN104377647B CN 104377647 B CN104377647 B CN 104377647B CN 201410707631 A CN201410707631 A CN 201410707631A CN 104377647 B CN104377647 B CN 104377647B
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Abstract
The invention provides a kind of leakage protection circuit, including detection of electrical leakage unit, whether leaked electricity for detecting in circuit, and export electric leakage signal when leaking electricity, first loop, including controlling switch, divider and protector, connected after controlling switch and divider parallel connection with protector, first loop cuts off supply line when receiving electric leakage signal by protector, the electric current of ON-OFF control circuit in the first loop disconnects controlling switch when being more than or equal to preset value, make current flow through divider and carry out partial pressure, controlling switch is turned on when electric current is less than preset value.When the first loop current is excessive, divider is connected and carry out partial pressure into the first loop, reduce the electric current for flowing through protector, avoid the excessive greater impact to caused by the executing agency coordinated with it of protector electric current, enhance the electrical endurance of earth leakage circuit breaker；When the first loop current is smaller, short circuit divider is understood again, it is ensured that protector there are enough electric currents to flow through to disconnect the power supply at failure.
Description
Technical field
The present invention relates to electric leakage protection technology field.Relate in particular to a kind of leakage protection circuit.
Background technology
It is to prevent one of effective measures of accident of human electric shock that earth leakage protective device is set in low-voltage distribution system, and is prevented
Because electric leakage causes one of technical measures of electrical fire and electrical equipment damage accident.
Common earth leakage protective device has earth leakage protective device, breaker etc..In the prior art, when loading on-line operation,
Can detect whether have leak current fault in circuit by detecting element, such as transformer, in concrete application, the fire of a certain phase line
Line, zero line pass through the magnet ring of transformer, constitute the primary winding of transformer, and the winding being wrapped on magnet ring constitutes transformer
Second siding ring.If not leaking electricity generation, live wire, the current vector of zero line are at this moment flowed through and equal to zero, therefore in mutual inductance
Also corresponding induced electromotive force will not be produced on the second siding ring of device.And in the event of electric leakage, then the electric current of live wire, zero line
Vector sum is not equal to zero, will make to produce induced electromotive force on the second siding ring of transformer, and triggers executing agency, such as de-
Detain the power supply at device dropout disengagement failure.
At present, at home in low voltage electrical apparatus industry, the leakage protection circuit in common electronic leakage protective breaker
The mode generally to be worked using single tripping coil, according to different needs, it is divided into discrete earth leakage circuit breaker and integrates
Formula earth leakage circuit breaker, Fig. 1 are the circuit theory diagrams of the leakage protection circuit of discrete earth leakage circuit breaker, and transformer is defeated
The signal gone out by simple resistance capacitance processing after be used for directly triggering controllable silicon D5, controllable silicon D5 conducting after, live wire A,
Loop is formed between tripping coil Coil, rectifier bridge, controllable silicon D5 and zero line N, has electric current to flow through tripping coil Coil, makes its production
Raw the suction-combining force makes hasp be disengaged with lock, and by main contact disjunction, power supply is to realize earth leakage protective function at disengagement failure；Fig. 2
For the circuit theory diagrams of the leakage protection circuit of integrated form earth leakage circuit breaker, transformer is exactly handled using integrated chip
The electric leakage signal that second siding ring detects.
But the either earth leakage circuit breaker of discrete or integrated form, in order to ensure that earth leakage circuit breaker is exchanging
Normal work under 50V~230V operating voltages, tripping coil used must are fulfilled for the energy normal work in the case where exchanging 50V voltages,
But in real work circuit, normal power supply voltage is 230V, and its voltage is beyond the normal of tripping coil Coil used
4 times of operating voltage, electrical apparatus release works in the case of beyond normal working voltage for a long time, and it is larger to flow through the electric current of electrical apparatus release,
Tripping coil Coil tripping force is considerably increased, this can cause larger impact to matched executing agency, produce not
Necessary damage, it can increase in addition, single tripping coil Coil works under long-term high current because heating reduces its service life
The possibility of its big damage.
The content of the invention
Therefore, the technical problems to be solved by the invention be leakage protection circuit of the prior art generally using
The mode of single tripping coil work, electrical apparatus release work in the case of beyond normal working voltage for a long time so that flow through electrical apparatus release
Electric current it is larger, cause the tripping force of tripping coil excessive, larger impact caused to matched executing agency, is generated
Unnecessary damage, the electrical endurance of earth leakage circuit breaker is reduced, can strengthen earth leakage protective open circuit so as to provide one kind
The leakage protection circuit of device electrical endurance.
In order to solve the above technical problems, technical scheme is as follows：
The invention provides a kind of leakage protection circuit, including：
Detection of electrical leakage unit, whether leaked electricity for detecting in circuit, and electric leakage signal is exported when leaking electricity；
After first loop, including controlling switch, divider and protector, the controlling switch and the divider parallel connection
Connected with the protector；First loop cuts off supply lines when receiving the electric leakage signal by the protector
Road；
ON-OFF control circuit, the electric current in first loop disconnect the control and opened when being more than or equal to preset value
Close, the electric current is flowed through the divider and carry out partial pressure；Electric current in first loop is led when being less than the preset value
Lead to the controlling switch.
Leakage protection circuit of the present invention, the detection of electrical leakage unit include transformer, the first voltage-stabiliser tube Z3, first
Electric capacity C5, first resistor R8 and second resistance R9；
The transformer includes magnet ring and the winding being wrapped on the magnet ring, and live wire and zero line pass from the magnet ring,
One end of the winding and the negative electrode of the first voltage-stabiliser tube Z3 couple, the other end of the winding and the first voltage-stabiliser tube Z3
Anode coupling, the negative electrode coupling of one end of the first electric capacity C5 after the first resistor R8 with the first voltage-stabiliser tube Z3
Connect, the other end of the first electric capacity C5 couples after the second resistance R9 with the anode of the first voltage-stabiliser tube Z3, described
One end of first electric capacity C5 and first resistor R8 couplings is the electric leakage signal output end of the detection of electrical leakage unit, is used for
Export the electric leakage signal.
Leakage protection circuit of the present invention, the protector 23 are the first tripping coil Coil.
Leakage protection circuit of the present invention, first loop also include the first controllable silicon D8, by the first diode
The bridge circuit and the first piezo-resistance that D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 are formed
MYR1；
The positive pole of the first diode D1 connects first as bridge circuit with the negative pole of the 3rd diode D3
End, the positive pole of the second diode D2 connect the second end as bridge circuit, institute with the negative pole of the 4th diode D4
State the first diode D1 negative pole and the negative pole of the second diode D2 connects the 3rd end as bridge circuit, the described 3rd
Diode D3 positive pole connects the 4th end as bridge circuit with the positive pole of the 4th diode D4；
The control pole of the first controllable silicon D8 and the electric leakage signal output end of the detection of electrical leakage unit couple, and described the
One controllable silicon D8 positive pole couples with the 3rd end of the bridge circuit, negative pole and the bridge-type electricity of the first controllable silicon D8
The 4th end coupling on road, one end and the live wire of the first tripping coil Coil couple, the first tripping coil Coil
The other end coupled after the first piezo-resistance MYR1 with the zero line, the both ends of the first piezo-resistance MYR1 difference
Coupled with the first end of the bridge circuit and the second end.
Leakage protection circuit of the present invention, the controlling switch include the second controllable silicon D6 and the 5th diode
D7；
It is in parallel with the divider after the second controllable silicon D6 and the 5th diode D7 series connection；
The positive pole of the second controllable silicon D6 couples with the 3rd end of the bridge circuit, and the second controllable silicon D6's is negative
Pole and the positive pole of the 5th diode D7 couple, the positive pole of the negative pole of the 5th diode D7 and the first controllable silicon D8
Coupling, the control pole of the second controllable silicon D6 couple with the voltage output end of the ON-OFF control circuit.
Leakage protection circuit of the present invention, the divider are coil N.
Leakage protection circuit of the present invention, first loop also include discharger, with the coil N parallel, use
The coil N is discharged in the moment powered off in the coil N.
Leakage protection circuit of the present invention, the discharger include the 6th diode D5, the 6th diode D5
One end for being connected with the positive pole of the second controllable silicon D6 of negative pole and the coil N couple, the 6th diode D5 is just
Pole couples with one end that the coil N is connected with the negative pole of the 5th diode D7.
Leakage protection circuit of the present invention, the ON-OFF control circuit include comparator U1,3rd resistor R1, the 4th
Resistance R2 and the second electric capacity C1；
The comparator U1 includes first input end, the second input and an output end；
The 4th resistance R2 is in parallel with the second electric capacity C1, one end and the bridge circuit of the 3rd resistor R1
The coupling of the 3rd end, the other end of the 3rd resistor R1 one with the 4th resistance R2 and the second electric capacity C1 simultaneously
Common port and the comparator U1 first input end couple, the 4th resistance R2 and the second electric capacity C1 another
Common end grounding, the second input termination predeterminated voltage V2, the comparator U1 of comparator U1 output end is described
The voltage output end of ON-OFF control circuit, coupled with the control pole of the second controllable silicon D6；
When the electric current in first loop is more than or equal to preset value, at the first input end of the comparator U1
The predeterminated voltage V2, the comparator U1 of second input end of the voltage more than or equal to the comparator U1 output end output
Low level；When the electric current in first loop is less than preset value, the voltage at the first input end of the comparator U1 is small
High level is exported in the predeterminated voltage V2, the comparator U1 of the second input end of the comparator U1 output end.
Leakage protection circuit of the present invention, the ON-OFF control circuit also include voltage and provide sub-circuit, the electricity
Pressure, which provides sub-circuit, includes the first voltage-stabiliser tube Z1, the second voltage-stabiliser tube Z2 and the 7th resistance R7；
The 7th resistance R7 is in parallel with the first voltage-stabiliser tube Z1 after being connected with the second voltage-stabiliser tube Z2, and described second
Voltage-stabiliser tube Z2 positive pole couples after being connected with the positive pole of the first voltage-stabiliser tube Z1 with the 4th end of the bridge circuit, and described the
Seven resistance R7 are connected rear electric with the positive pole of the first controllable silicon D8 coupling, the described 7th with the negative pole of the first voltage-stabiliser tube Z1
One end for being connected with the negative pole of the first voltage-stabiliser tube Z1 of resistance R7 is for giving comparator U1 offer DC voltages, and the described 7th
Resistance R7 and the second voltage-stabiliser tube Z2 common port is used to export the predeterminated voltage V2.
The above-mentioned technical proposal of the present invention has advantages below compared with prior art：
The invention provides a kind of leakage protection circuit, including detection of electrical leakage unit, whether occur for detecting in circuit
Electric leakage, and electric leakage signal is exported when leaking electricity, the first loop, including controlling switch, divider and protector, control are opened
Connected after pass and divider parallel connection with protector, the first loop cuts off supply lines when receiving electric leakage signal by protector
Road, the electric current of ON-OFF control circuit in the first loop disconnect controlling switch when being more than or equal to preset value, make current flow through point
Depressor carries out partial pressure, and controlling switch is turned on when electric current is less than preset value.Namely when the first loop current is excessive, make divider
Connect and carry out partial pressure into the first loop, reduce and flow through the electric current of protector, avoid excessive pair of protector electric current and coordinate with it
What the service life caused by heating that worked under greater impact caused by executing agency, and the long-term high current of protector reduced
Phenomenon, enhance the electrical endurance of earth leakage circuit breaker；When the first loop current is smaller, short circuit divider is understood again, it is ensured that
Protector has enough electric currents to flow through to disconnect the power supply at failure, it is ensured that the smooth realization of creepage protection function.
Brief description of the drawings
In order that present disclosure is more likely to be clearly understood, specific embodiment and combination below according to the present invention
Accompanying drawing, the present invention is further detailed explanation, wherein
Fig. 1 is the circuit theory diagrams of discrete leakage protection circuit in the prior art；
Fig. 2 is the circuit theory diagrams of integrated form leakage protection circuit in the prior art；
Fig. 3 is the structured flowchart of leakage protection circuit of the present invention；
Fig. 4 is the circuit theory diagrams of leakage protection circuit of the present invention.
Reference is expressed as in figure：1- detection of electrical leakage units, the loops of 2- first, 3- ON-OFF control circuits, 4- electricity consumptions are set
It is standby, 5- executing agencies, 6- power supplys, 11- transformers, 21- controlling switches, 22- divider, 23- protectors, 24- dischargers, 34-
Voltage provides sub-circuit.
Embodiment
A kind of leakage protection circuit is present embodiments provided, as shown in figure 3, including：
Detection of electrical leakage unit 1, whether leaked electricity for detecting in circuit, and electric leakage signal is exported when leaking electricity；
First loop 2, including controlling switch 21, divider 22 and protector 23, the controlling switch 21 and described point
Connected after the parallel connection of depressor 22 with the protector 23；First loop 2 passes through the guarantor when receiving the electric leakage signal
Protect device 23 and cut off supply line；
ON-OFF control circuit 3, the electric current in first loop 2 disconnect the control and opened when being more than or equal to preset value
21 are closed, the electric current is flowed through the divider 22 and carries out partial pressure；Electric current in first loop 2 is less than the preset value
When turn on the controlling switch 21.
, electric leakage signal can be exported to
Primary Ioops 2, after electric leakage signal is received, the protector 23 in the first loop 2 can control executing agency 5 to act in the first loop 2, break
Power supply 6 at the electrical equipment 4 of the raw electric leakage of exploitation, prevent operating personnel from occurring to touch after touching the metal shell of electrical equipment 4
Electricity.In the prior art, acted in order to ensure protector 23 produces enough strength control executing agencies 5, can typically make to flow through guarantor
It is bigger to protect the electric current of device 23, namely the electric current in the first loop 2 is bigger, but protector 23 works appearance under high current for a long time
Easily heating reduces service life, separately flows through the electric current of protector 23 and excessive can also make 23 pairs of executing agencies coordinated with it of protector
Impact is larger caused by 5, causes executing agency 5 to damage.
When electric current in the first loop 2 is more than or equal to preset value, ON-OFF control circuit 3 can control controlling switch 21 disconnected
Open, now divider 22 puts into the first loop 2 and carries out partial pressure, makes the current reduction in the first loop 2, flows through the electricity of protector 23
Stream can naturally also reduce, and reduce its impact to executing agency 5, extend the use longevity of protector 23 and executing agency 5
Life；When electric current in the first loop 2 is less than preset value, ON-OFF control circuit 3 can turn on controlling switch 21, now divider 22
By the short circuit of controlling switch 21, the first loop 2 is cut out so that protector 23, which flows through sufficiently large electric current, acts executing agency 5.Cause
This, leakage protection circuit described in the present embodiment controls executing agency 5 to disconnect at failure when ensuring that protector 23 is leaking electricity
While power supply is to realize creepage protection function, moreover it is possible to reduce the electric current for flowing through protector 23 as far as possible, prevent it to execution machine
Structure 5 produces excessive impact, extends its electrical endurance.
Preferably, as shown in figure 4, the detection of electrical leakage unit 1 can include transformer 11, the first voltage-stabiliser tube Z3, first
Electric capacity C5, first resistor R8 and second resistance R9；
The transformer 11 includes magnet ring and the winding being wrapped on the magnet ring, and live wire and zero line are worn from the magnet ring
Go out, one end of the winding and the negative electrode of the first voltage-stabiliser tube Z3 couple, the other end of the winding and first voltage stabilizing
Pipe Z3 anode coupling, the negative electrode of one end of the first electric capacity C5 after the first resistor R8 with the first voltage-stabiliser tube Z3
Coupling, the other end of the first electric capacity C5 couple after the second resistance R9 with the anode of the first voltage-stabiliser tube Z3, institute
The one end for stating the first electric capacity C5 and first resistor R8 couplings is the electric leakage signal output end of the detection of electrical leakage unit 1,
For exporting the electric leakage signal.
Specifically, when leak current fault occurs in circuit, the electric current and the outflow magnetic of transformer 11 of the magnet ring of transformer 11 are flowed into
The vector of the electric current of ring is not zero, and the winding both ends of transformer 11 will produce induced electromotive force, steady through the first voltage-stabiliser tube Z3
Press amplitude limit and first resistor R8 and second resistance R9 partial pressure after-applied on the first electric capacity C5, the electricity of the first electric capacity C5 and first
The voltage of one end of resistance R8 couplings can be used as electric leakage signal, and corresponding first electric capacity C2 and first resistor R4 one end coupled is
For the electric leakage signal output end of detection of electrical leakage unit 1.First resistor R8 and the first electric capacity C5 connections can be filtered, and be filtered out
Interference in electric leakage signal.
Preferably, as shown in figure 4, the protector 23 can be the first tripping coil Coil.
Preferably, as shown in figure 4, first loop 2 can also include the first controllable silicon D8, by the first diode D1,
Second diode D2, the 3rd diode D3 and the 4th diode D4 compositions bridge circuit and the first piezo-resistance MYR1；
The positive pole of the first diode D1 connects first as bridge circuit with the negative pole of the 3rd diode D3
End, the positive pole of the second diode D2 connect the second end as bridge circuit, institute with the negative pole of the 4th diode D4
State the first diode D1 negative pole and the negative pole of the second diode D2 connects the 3rd end as bridge circuit, the described 3rd
Diode D3 positive pole connects the 4th end as bridge circuit with the positive pole of the 4th diode D4；
The control pole of the first controllable silicon D8 couples with the electric leakage signal output end of the detection of electrical leakage unit 1, described
First controllable silicon D8 positive pole couples with the 3rd end of the bridge circuit, negative pole and the bridge-type of the first controllable silicon D8
The 4th end coupling of circuit, one end and the live wire of the first tripping coil Coil couple, first tripping coil
The Coil other end couples after the first piezo-resistance MYR1 with the zero line, the both ends of the first piezo-resistance MYR1
Coupled respectively with the first end of the bridge circuit and the second end.
Specifically, the alternating current between live wire and zero line can apply after bridge circuit rectification to the first controllable silicon D8 positive pole
One forward voltage, because the first controllable silicon D8 control pole and the electric leakage signal output end of detection of electrical leakage unit 1 couple, it is
Electrically connected with the first electric capacity C5 with the common port between first resistor R8, when induced electromotive force caused by detection of electrical leakage unit 1 is enough
Greatly, namely electric leakage signal is sufficiently strong, during the trigger voltage for the control pole for reaching the first controllable silicon D8, will triggering and conducting first can
Silicon D8 is controlled, and after the first controllable silicon D8 conductings, live wire A, the first tripping coil Coil, bridge circuit, the first controllable silicon D8, zero
The loop of a conducting will be formed between line N, namely the first loop 2 turns on, and now has electric current and flows through the first tripping coil
Coil, it is produced the suction-combining force makes hasp be disengaged with lock, and by main contact disjunction, power supply is to realize earth leakage protective at disengagement failure
Function.And the first tripping coil Coil and the first piezo-resistance MYR1 are in series, surge can be absorbed, holding circuit is stable.
Preferably, as shown in figure 4, the controlling switch 21 can include the second controllable silicon D6 and the 5th diode D7；
It is in parallel with the divider 22 after the second controllable silicon D6 and the 5th diode D7 series connection；
The positive pole of the second controllable silicon D6 couples with the 3rd end of the bridge circuit, and the second controllable silicon D6's is negative
Pole and the positive pole of the 5th diode D7 couple, the positive pole of the negative pole of the 5th diode D7 and the first controllable silicon D8
Coupling, the control pole of the second controllable silicon D6 couple with the voltage output end of the ON-OFF control circuit 3.
Specifically, when the electric current in the first loop 2 is more than or equal to preset value, ON-OFF control circuit 3 to second is controllable
Silicon D6 control pole output low level, less than the second controllable silicon D6 trigger voltage, is kept it turned off, and the second controllable silicon D6 is cut
Only, namely controlling switch 21 disconnects so that divider 22 puts into the first loop 2 and carries out partial pressure, reduces the electricity in the first loop 2
Stream；When electric current in the first loop 2 is less than preset value, ON-OFF control circuit 3 exports high to the second controllable silicon D6 control pole
Level, higher than the second controllable silicon D6 trigger voltage, turn it on, now the electric current in circuit directly through the second controllable silicon D6,
Zero line N is returned to after 5th diode D7, the first controllable silicon D8, rectifier bridge, divider 22 is shorted, and cuts out the first loop 2.
Preferably, as shown in figure 4, the divider 22 can be coil N.
Specifically, the leakage protection circuit in the present embodiment, the electricity in the first loop 2 is detected by ON-OFF control circuit 3
Stream situation, and being turned on or off for controlling switch 21 is controlled according to current conditions, realize the two kinds of work of unicoil and twin coil
The startup switching of mode, and being worked using unicoil (the first tripping coil Coil) under low current, two coils under high current (the
One tripping coil Coil and coil N) series connection partial pressure the mechanism of action, reaching reduces the electric current for flowing through the first tripping coil Coil
Purpose, tripping force during its dropout is reduced, prevent it from, to the excessive damage brought of executing agency's impulsive force (the suction-combining force), enhancing
The electrical endurance of product.
Preferably, as shown in Figure 3, Figure 4, first loop 2 can also include discharger 24, and the coil N parallel,
Moment for being powered off in the coil N discharges the coil N.
Preferably, as shown in figure 4, the discharger 24 can include the 6th diode D5, the 6th diode D5's
Negative pole couples with one end that the coil N is connected with the positive pole of the second controllable silicon D6, the positive pole of the 6th diode D5
Coupled with one end that the coil N is connected with the negative pole of the 5th diode D7.
Specifically, when the moment of the second controllable silicon D6 conductings, coil N are shorted, now coil N can enter in the moment of power-off
Row electric discharge, if not increasing by the 6th diode D5, the electricity that coil N is released is possible to meeting reverse breakdown the second controllable silicon D6 and the 5th
Diode D7, by increasing by the 6th diode D5, a discharge loop can be formed between coil N and the 6th diode D5, prevents the
Two controllable silicon D6 and the 5th diode D7 are reversed breakdown.
Preferably, as shown in figure 4, the ON-OFF control circuit 3 can include comparator U1,3rd resistor R1, the 4th electricity
Hinder R2 and the second electric capacity C1；
The comparator U1 includes first input end, the second input and an output end；
The 4th resistance R2 is in parallel with the second electric capacity C1, one end and the bridge circuit of the 3rd resistor R1
The coupling of the 3rd end, the other end of the 3rd resistor R1 one with the 4th resistance R2 and the second electric capacity C1 simultaneously
Common port and the comparator U1 first input end couple, the 4th resistance R2 and the second electric capacity C1 another
Common end grounding, the second input termination predeterminated voltage V2, the comparator U1 of comparator U1 output end is described
The voltage output end of ON-OFF control circuit 3, coupled with the control pole of the second controllable silicon D6；
When the electric current in first loop 2 is more than or equal to preset value, at the first input end of the comparator U1
Second input end of the voltage more than or equal to the comparator U1 predeterminated voltage V2, the output end of the comparator U1 is defeated
Go out low level；When the electric current in first loop 2 is less than preset value, the voltage at the first input end of the comparator U1
The predeterminated voltage V2, the comparator U1 of the second input end less than the comparator U1 output end output high level.
Specifically, the comparator U1 can select voltage comparator chip, according to the characteristic of voltage comparator chip, when
When just (+) input terminal voltage is higher than negative (-) input terminal voltage, the output end output of voltage comparator chip is high level for it, when
When just (+) input terminal voltage is less than negative (-) input terminal voltage, the output end output of voltage comparator chip is low level for it.In advance
If preset value and 3rd resistor R1 that voltage V2 value can be according to the electric current in the first loop 2, the 4th resistance R2 resistance
To determine.
In the present embodiment, comparator U1 first input end (at pin 2) is negative input end, and the second of comparator U1 inputs
End is positive input terminal (at pin 3).When the electric current in the first loop 2 is more than or equal to preset value, flow through the 6th resistance R5's
Electric current also can be bigger so that the voltage on the 6th resistance R5 also can be bigger, now comparator U1 first input end (pin
2) the predeterminated voltage V2 at the second input (pin 3) place that the voltage at place will be more than or equal to comparator U1, namely just (+) is defeated
Enter terminal voltage and be less than negative (-) input terminal voltage, comparator U1 output end (pin 1) place will export low level, and second is controllable
Silicon D6 ends so that coil N puts into the first loop 2 and carries out partial pressure, reduces the electric current in the first loop 2；When in the first loop 2
Electric current when being less than preset value, the electric current for flowing through the 6th resistance R5 also can be smaller so that the voltage on the 6th resistance R5 also can
Smaller, the second input that now voltage at comparator U1 first input end (pin 2) place will be less than comparator U1 (draws
Pin 3) place predeterminated voltage V2, namely just (+) input terminal voltage is higher than negative (-) input terminal voltage, and comparator U1 output end (is drawn
Pin 1) place will export high level, the second controllable silicon D6 conductings so that coil N cuts out the first loop 2.
Specifically, in order to strengthen the voltage signal intensity of comparator U1 output end output, it is made when exporting high level
It is enough to turn on the second controllable silicon D6, pull-up circuit can be added in comparator U1 output end, as shown in figure 4, the 5th resistance R4
Above-mentioned pull-up circuit is constituted with the 6th resistance R5, specific annexation terminates DC voltage V1 for the one of the 5th resistance R4,
The other end of the 5th resistance R4 couples with one end of the 6th resistance R5, the other end ground connection of the 6th resistance R5,
The 5th resistance R4 and the 6th resistance R5 common port couples with the output end of the comparator U1.
Preferably, the ON-OFF control circuit 3 can also include voltage offer sub-circuit 34, and the voltage provides sub-circuit
34 can include the first voltage-stabiliser tube Z1, the second voltage-stabiliser tube Z2 and the 7th resistance R7；
The 7th resistance R7 is in parallel with the first voltage-stabiliser tube Z1 after being connected with the second voltage-stabiliser tube Z2, and described second
Voltage-stabiliser tube Z2 positive pole couples after being connected with the positive pole of the first voltage-stabiliser tube Z1 with the 4th end of the bridge circuit, and described the
Seven resistance R7 are connected rear electric with the positive pole of the first controllable silicon D8 coupling, the described 7th with the negative pole of the first voltage-stabiliser tube Z1
One end for being connected with the negative pole of the first voltage-stabiliser tube Z1 of resistance R7 is for giving comparator U1 offer DC voltages V1, and described the
Seven resistance R7 and the second voltage-stabiliser tube Z2 common port is used to export the predeterminated voltage V2.
Specifically, by the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2 pressure stabilization function, can be provided to comparator U1 steady
Fixed DC voltage V1 and predeterminated voltage V2, control are more accurate.
Leakage protection circuit described in the present embodiment, when electric current is excessive in the first loop 2, divider 22 is set to connect into first time
Road 2 carries out partial pressure, reduces the electric current for flowing through protector 23, avoids excessive pair of executing agency coordinated with it of the electric current of protector 23
Work the phenomenon that service life reduces caused by heating under greater impact caused by 5, and 23 long-term high current of protector,
Enhance the electrical endurance of earth leakage circuit breaker；When electric current is smaller in the first loop 2, short circuit divider 22 is understood again, it is ensured that is protected
Shield device 23 has enough electric currents to flow through to disconnect the power supply at failure, it is ensured that the smooth realization of creepage protection function.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (6)
- A kind of 1. leakage protection circuit, it is characterised in that including：Whether detection of electrical leakage unit (1), leak electricity for detecting in circuit, and exports electric leakage signal when leaking electricity；First loop (2), including controlling switch (21), divider (22) and protector (23), the controlling switch (21) and Connected after the divider (22) is in parallel with the protector (23), first loop (2) is receiving the electric leakage signal When pass through the protector (23) cut off supply line；ON-OFF control circuit (3), the electric current in first loop (2) disconnect the control and opened when being more than or equal to preset value Close (21), the electric current is flowed through the divider (22) and carry out partial pressure；Electric current in first loop (2) is less than described The controlling switch (21) is turned on during preset value；The protector (23) is the first tripping coil (Coil)；First loop (2) also includes the first controllable silicon (D8), by the first diode (D1), the second diode (D2), the 3rd The bridge circuit and the first piezo-resistance (MYR1) of diode (D3) and the 4th diode (D4) composition；The positive pole of first diode (D1) connects first as bridge circuit with the negative pole of the 3rd diode (D3) End, the positive pole of second diode (D2) connect second as bridge circuit with the negative pole of the 4th diode (D4) End, the negative pole of first diode (D1) connect the 3rd as bridge circuit with the negative pole of second diode (D2) End, the positive pole of the 3rd diode (D3) connect the as bridge circuit the 4th with the positive pole of the 4th diode (D4) End；The control pole of first controllable silicon (D8) and the electric leakage signal output end of the detection of electrical leakage unit (1) couple, described 3rd end of the positive pole of the first controllable silicon (D8) and the bridge circuit couples, the negative pole of first controllable silicon (D8) with it is described The 4th end coupling of bridge circuit, one end and the live wire of first tripping coil (Coil) couple, first tripping coil (Coil) the other end couples after first piezo-resistance (MYR1) with zero line, and the two of first piezo-resistance (MYR1) End couples with the first end of the bridge circuit and the second end respectively；The controlling switch (21) includes the second controllable silicon (D6) and the 5th diode (D7)；It is in parallel with the divider (22) after second controllable silicon (D6) and the 5th diode (D7) series connection；The positive pole of second controllable silicon (D6) couples with the 3rd end of the bridge circuit, and second controllable silicon (D6) is born Pole and the positive pole of the 5th diode (D7) couple, the negative pole of the 5th diode (D7) and first controllable silicon (D8) Positive pole coupling, the control pole of second controllable silicon (D6) and the voltage output end of the ON-OFF control circuit (3) couple.
- 2. leakage protection circuit according to claim 1, it is characterised in that the detection of electrical leakage unit (1) includes mutual inductance Device (11), the first voltage-stabiliser tube (Z3), the first electric capacity (C5), first resistor (R8) and second resistance (R9)；The transformer (11) includes magnet ring and the winding being wrapped on the magnet ring, and live wire and zero line pass from the magnet ring, One end of the winding and the negative electrode of first voltage-stabiliser tube (Z3) couple, the other end of the winding and first voltage-stabiliser tube (Z3) anode coupling, one end of first electric capacity (C5) after the first resistor (R8) with first voltage-stabiliser tube (Z3) Negative electrode coupling, the other end of first electric capacity (C5) after the second resistance (R9) with first voltage-stabiliser tube (Z3) Anode couples, and first electric capacity (C5) and one end of the first resistor (R8) coupling are the detection of electrical leakage unit (1) Electric leakage signal output end, for exporting the electric leakage signal；The divider (22) is coil (N).
- 3. leakage protection circuit according to claim 2, it is characterised in that first loop (2) also includes discharger (24), in parallel with the coil (N), the moment for being powered off in the coil (N) discharges the coil (N).
- 4. leakage protection circuit according to claim 3, it is characterised in that the discharger (24) includes the 6th diode (D5), the negative pole of the 6th diode (D5) be connected with the coil (N) with the positive pole of second controllable silicon (D6) one End coupling, what the positive pole of the 6th diode (D5) was connected with the coil (N) with the negative pole of the 5th diode (D7) One end couples.
- 5. leakage protection circuit according to claim 1, it is characterised in that the ON-OFF control circuit (3) includes comparing Device (U1), 3rd resistor (R1), the 4th resistance (R2) and the second electric capacity (C1)；The comparator (U1) includes first input end, the second input and an output end；4th resistance (R2) is in parallel with second electric capacity (C1), one end and the bridge-type electricity of the 3rd resistor (R1) The 3rd end coupling on road, the other end of the 3rd resistor (R1) simultaneously with the 4th resistance (R2) and second electric capacity (C1) the first input end coupling of a common port and the comparator (U1), the 4th resistance (R2) and described second Another common end grounding of electric capacity (C1), the second input termination predeterminated voltage (V2) of the comparator (U1), the comparison The output end of device (U1) is the voltage output end of the ON-OFF control circuit (3), the control with second controllable silicon (D6) Pole couples；When the electric current in first loop (2) is more than or equal to preset value, at the first input end of the comparator (U1) Voltage be more than or equal to the comparator (U1) the second input end predeterminated voltage (V2), the comparator (U1) it is defeated Go out end output low level；When the electric current in first loop (2) is less than preset value, the first input of the comparator (U1) Voltage at end is less than the predeterminated voltage (V2) of the second input end of the comparator (U1), the output of the comparator (U1) End output high level.
- 6. leakage protection circuit according to claim 5, it is characterised in that the ON-OFF control circuit (3) also includes electricity Pressure provides sub-circuit (34), the voltage provide sub-circuit (34) include the first voltage-stabiliser tube (Z1), the second voltage-stabiliser tube (Z2) and 7th resistance (R7)；7th resistance (R7) is in parallel with first voltage-stabiliser tube (Z1) after being connected with second voltage-stabiliser tube (Z2), and described The 4th end that the positive pole of two voltage-stabiliser tubes (Z2) is connected with the positive pole of first voltage-stabiliser tube (Z1) afterwards with the bridge circuit couples, 7th resistance (R7) be connected with the negative pole of first voltage-stabiliser tube (Z1) after with the positive pole coupling of first controllable silicon (D8) Connect, one end that the 7th resistance (R7) is connected with the negative pole of first voltage-stabiliser tube (Z1) is used to carry to the comparator (U1) For DC voltage, the common port of the 7th resistance (R7) and second voltage-stabiliser tube (Z2) is used to export the predeterminated voltage (V2)。
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| CN201410707631.7A CN104377647B (en) | 2014-11-27 | 2014-11-27 | leakage protection circuit |
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| CN201410707631.7A CN104377647B (en) | 2014-11-27 | 2014-11-27 | leakage protection circuit |
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| CN105826897A (en) * | 2016-05-19 | 2016-08-03 | 辛文忠 | Residual current circuit breaker and residual current circuit breaking method |
| CN208174237U (en) * | 2017-02-17 | 2018-11-30 | 杰华特微电子（杭州）有限公司 | leakage protection circuit |
| CN107919661B (en) * | 2017-12-28 | 2024-07-02 | 多格电气有限公司 | Modular surge protector |
| CN110247366B (en) * | 2019-06-18 | 2024-07-09 | 德力西电气有限公司 | Leakage protection circuit for preventing coil from burning out |
| CN110531219A (en) * | 2019-09-05 | 2019-12-03 | 上海芯荃微电子科技有限公司 | A kind of exchange detection method and circuit using switch drain |
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| CN202103404U (en) * | 2011-06-21 | 2012-01-04 | 安德利集团有限公司 | Electric leakage breaker |
| CN202210115U (en) * | 2011-09-20 | 2012-05-02 | 浙江德力西电器股份有限公司 | Residual current signal measuring circuit based on controlled silicon protection |
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| CN203883452U (en) * | 2014-06-12 | 2014-10-15 | 德力西电气有限公司 | Electric leakage protection circuit |
| CN204205560U (en) * | 2014-11-27 | 2015-03-11 | 德力西电气有限公司 | leakage protection circuit |
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| JP2008035596A (en) * | 2006-07-27 | 2008-02-14 | Yokowo Co Ltd | Protective circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202103404U (en) * | 2011-06-21 | 2012-01-04 | 安德利集团有限公司 | Electric leakage breaker |
| CN202210115U (en) * | 2011-09-20 | 2012-05-02 | 浙江德力西电器股份有限公司 | Residual current signal measuring circuit based on controlled silicon protection |
| CN203339658U (en) * | 2013-04-12 | 2013-12-11 | 海尔集团公司 | Electric leakage protection device |
| CN203883452U (en) * | 2014-06-12 | 2014-10-15 | 德力西电气有限公司 | Electric leakage protection circuit |
| CN204205560U (en) * | 2014-11-27 | 2015-03-11 | 德力西电气有限公司 | leakage protection circuit |
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