CN204464951U - Leakage protection circuit, plug, socket and switch - Google Patents
Leakage protection circuit, plug, socket and switch Download PDFInfo
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- CN204464951U CN204464951U CN201520231748.2U CN201520231748U CN204464951U CN 204464951 U CN204464951 U CN 204464951U CN 201520231748 U CN201520231748 U CN 201520231748U CN 204464951 U CN204464951 U CN 204464951U
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Abstract
The utility model provides leakage protection circuit, plug, socket and switch, and the normally opened contact of the relay in wherein said leakage protection circuit is connected in alternating current loop, and the coils connected in series of described relay is in coil current supply circuit; Coil power supply loop is used for the coil power supply of described relay; Failure detector circuit is used for producing triggering signal when earth fault being detected and outputting to circuits for triggering; Described circuits for triggering are used for disconnecting described coil power supply loop when receiving described triggering signal to make the coil losing electricity of described relay; It is electric to make the coil of described relay obtain that reset circuit is used for coil power supply loop described in conducting; Described rectification circuit is used for described alternating current being converted to direct current to power to described coil power supply loop, described failure detector circuit and described reset circuit.The earth leakage protective device solving prior art thus can not make power supply recover rapidly the technical problem connected after leak current fault is got rid of.
Description
Technical field
The utility model relates to electric leakage protection technology field, is specifically related to leakage protection circuit, plug, socket and switch.
Background technology
Earth leakage protective; namely when the phase line of protected circuit is directly or by unexpected load to when greatly connecting; near sinusoidal waveform can be produced and its effective value is the residual current of slowly change, cut off this circuit when this electric current is greater than certain numerical value, thus play a protective role.Various electric equipment needs to use plug to switch on power and can normally use; traditional plug does not have creepage protection function, can not automatic cut-off power when there is electric leakage, thus easily electric shock accidents occurs; even initiation fire, causes very large threat to the person and equipment.
For the deficiency that traditional plug exists; there is the leakage protecting plug with creepage protection function in the market; this plug in use; circuit just can in time by dump once generation electric leakage; but effectively can not reset after dump, cause thus making power supply recover rapidly to connect after leak current fault is got rid of.
Utility model content
For this reason; technical problem to be solved in the utility model is that the earth leakage protective device of prior art can not make power supply recover rapidly to connect after leak current fault is got rid of, thus proposes a kind of leakage protection circuit, plug, socket and switch that power supply can be able to be made after leak current fault is got rid of to recover rapidly to connect and solve this problem.
The technical solution adopted in the utility model is as follows:
A kind of leakage protection circuit, for disconnecting alternating current loop when there is earth fault, described leakage protection circuit comprises relay, coil power supply loop, failure detector circuit, circuits for triggering, reset circuit and rectification circuit, between the input that the normally opened contact of described relay is connected on described alternating current loop and output, the coils connected in series of described relay is in described coil power supply loop, wherein, described coil power supply loop is used for the coil power supply of described relay; Described failure detector circuit is used for producing triggering signal when earth fault being detected and outputting to described circuits for triggering; Described circuits for triggering are used for disconnecting described coil power supply loop when receiving described triggering signal to make the coil losing electricity of described relay, thus described normally opened contact disconnects to make described alternating current loop disconnect; It is electric to make the coil of described relay obtain that described reset circuit is used for coil power supply loop described in conducting, thus described normally opened contact is closed to make described alternating current loop recover conducting; Described rectification circuit is used for described alternating current being converted to direct current to power to described coil power supply loop, described failure detector circuit and described reset circuit.
Preferably, described coil power supply loop comprises triode Q1, filter capacitor C1, resistance R1 and resistance R2, the grounded emitter of triode Q1, base stage one end of contact resistance R1 and one end of resistance R2 respectively of triode Q1, the collector electrode of triode Q1 connects one end A of the coil of described relay; The other end B of the coil of described relay connects the DC output end positive pole of described rectification circuit; The other end ground connection of resistance R1, the other end of resistance R2 is connected with described reset circuit with described circuits for triggering respectively; One end of filter capacitor C1 connects the other end B of the coil of described relay, the other end ground connection of filter capacitor C1.
Further, described circuits for triggering comprise one-way SCR Q2, electric capacity C7, the control pole of one-way SCR Q2 connects the trigger end of described failure detector circuit, the described other end of the anode contact resistance R2 of one-way SCR Q2, the minus earth of one-way SCR Q2, electric capacity C7 is connected in parallel on the negative electrode of one-way SCR Q2 and controls between pole.
Further, described reset circuit comprises switch S 1, switch S 2, resistance R6, resistance R7 and one-way SCR Q3, the anode of one-way SCR Q3 connects the DC output end positive pole of described rectification circuit by a resistance R5, the control pole of one-way SCR Q3 is connected with one end of switch S 2 through resistance R7, the negative electrode of one-way SCR Q3 is connected with one end of switch S 1 through resistance R6, the other end of switch S 2 connects the anode of one-way SCR Q3, the other end ground connection of switch S 1, switch S 1 is connected with the described other end of resistance R2 with the link of resistance R6.
Preferably, described failure detector circuit comprises earth fault control chip U1, Current Transmit 1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, resistance R3 and resistance R4, the power positive end 6 of earth fault control chip U1 connects the DC output end positive pole of described rectification circuit by a resistance R5, earth terminal 4 ground connection of earth fault control chip U1, the trigger end 5 of earth fault control chip U1 connects the input of described circuits for triggering, the amplifier output 7 of earth fault control chip U1 connects one end of electric capacity C3 and one end of resistance R3 respectively, feedback voltage end 1 other end of contact resistance R3 and one end of resistance R4 respectively of earth fault control chip U1, the reference voltage end 3 of earth fault control chip U1 connects Current Transmit 1 output one end, the other end of electric capacity C3 connects one end of electric capacity C2 and one end of inductance L 1, the other end ground connection of electric capacity C2 respectively, and inductance L 1 is in parallel with electric capacity C2, Current Transmit 1 is set in described alternating current loop, and the output other end of Current Transmit 1 passes through the other end of electric capacity C5 contact resistance R4, and electric capacity C4 is connected in parallel between the output two ends of Current Transmit 1, one end of electric capacity C6 is connected with the power positive end 6 of earth fault control chip U1, the other end ground connection of electric capacity C6.
Preferably, described leakage protection circuit also comprises earth fault test circuit, and described earth fault test circuit comprises switch S 3 and resistance R8, one end ground connection of switch S 3, and the other end of switch S 3 connects the output live wire of described alternating current by resistance R8.
Preferably, described rectification circuit comprises rectifier diode D1, and the anode tap of rectifier diode D1 connects the input live wire of described alternating current, and the cathode terminal of rectifier diode D1 is DC output end positive pole.
The utility model also provides a kind of leakage protecting plug, and described leakage protecting plug comprises the leakage protection circuit described in technique scheme.
The utility model also provides a kind of earth leakage protective socket, and described earth leakage protective socket comprises the leakage protection circuit described in technique scheme.
The utility model also provides a kind of earth leakage circuit-breaker, and described earth leakage circuit-breaker comprises the leakage protection circuit described in technique scheme.
Technique scheme of the present utility model has the following advantages compared to existing technology:
Leakage protection circuit of the present utility model, plug, socket and switch; in described leakage protection circuit; upon the occurrence of a ground fault; described circuits for triggering receive the triggering signal that described failure detector circuit sends; and disconnect described coil power supply loop the coil losing electricity of described relay is disconnected to make the normally opened contact of the described relay be connected in described alternating current loop; then described alternating current loop is made to disconnect; as can be seen here, leakage protection circuit of the present utility model can fast and effeciently cut off alternating current loop when there is earth fault.The described alternating current loop disconnected can not be made after earth fault is got rid of effectively to recover the problem connected for prior art, the utility model adopts described reset circuit to make described coil power supply loop recover conducting, thus it is electric to make the coil of described relay obtain, described alternating current loop is made to recover rapidly to connect after leak current fault is got rid of, enter and ensure to stablize under normal circumstances, reliably work in described alternating current loop, enhance productivity.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is the structural representation of the leakage protection circuit of the utility model embodiment 1;
Fig. 2 is the circuit theory schematic diagram of the leakage protection circuit of the utility model embodiment 1;
Fig. 3 is the circuit theory schematic diagram of the leakage protection circuit of the utility model embodiment 2.
Fig. 4 is the circuit theory schematic diagram of the leakage protection circuit of the utility model embodiment 3.
Embodiment
Embodiment 1
Fig. 1 shows a kind of leakage protection circuit of the utility model embodiment 1, and it is for disconnecting alternating current loop when there is earth fault.For this reason; described leakage protection circuit comprises relay 1, coil power supply loop 2, failure detector circuit 3, circuits for triggering 4, reset circuit 5 and rectification circuit 6; between the input that the normally opened contact of relay 1 is connected on described alternating current loop and output, the coils connected in series of relay 1 is in coil current supply circuit 2.
Wherein, coil power supply loop 2 is for giving the coil power supply of described relay.Failure detector circuit 3 is for producing triggering signal when earth fault being detected and outputting to circuits for triggering 4.Circuits for triggering 4 are for disconnecting coil current supply circuit 2 to make the coil losing electricity of relay 1 when receiving described triggering signal, thus described normally opened contact disconnects to make described alternating current loop disconnect.Reset circuit 5 is electric to make the coil of relay 1 obtain for conducting coil current supply circuit 2, thus described normally opened contact is closed to make described alternating current loop recover conducting.Rectification circuit 6 is for being converted to direct current to power to coil power supply loop 2, failure detector circuit 3 and reset circuit 5 by described alternating current.
Upon the occurrence of a ground fault; circuits for triggering 4 receive the triggering signal that failure detector circuit 3 sends; and disconnect coil current supply circuit 2 coil losing electricity of relay 1 is disconnected to make the normally opened contact of the relay 1 be connected in described alternating current loop; then described alternating current loop is made to disconnect; as can be seen here, the leakage protection circuit of the present embodiment can fast and effeciently cut off alternating current loop when there is earth fault.The described alternating current loop disconnected can not be made after earth fault is got rid of effectively to recover the problem connected for prior art, the present embodiment adopts reset circuit 5 to make coil power supply loop 2 recover conducting, thus it is electric to make the coil of relay 1 obtain, described alternating current loop is made to recover rapidly to connect after leak current fault is got rid of, and then ensure to stablize under normal circumstances, reliably work in described alternating current loop, enhance productivity.
Hereafter the embodiment of technique scheme is introduced:
As shown in Figure 2, relay 1 has two secondary normally open contacts, this two secondary normally open contact is connected in described alternating current loop, one end of described contact is input live wire 1L and the zero line 1N in described alternating current loop, and the other end of described contact is output live wire 2L and the zero line 2N in described alternating current loop.The coils connected in series of relay 1 is in coil current supply circuit 2.
Coil power supply loop 2 comprises triode Q1, filter capacitor C1, resistance R1 and resistance R2.Wherein, the grounded emitter of triode Q1, base stage one end of contact resistance R1 and one end of resistance R2 respectively of triode Q1, one end A of the coil of the collector connection relay 1 of triode Q1; The other end B of the coil of relay 1 connects the DC output end positive pole of rectification circuit 6; The other end ground connection of resistance R1, the other end of resistance R2 is connected with reset circuit 5 with circuits for triggering 4 respectively; One end of filter capacitor C1 connects the other end B of the coil of described relay, the other end ground connection of filter capacitor C1.Triode Q1 plays the effect of gate-controlled switch, when the described other end input high level of resistance R2, and triode Q1 conducting, thus it is electric that the coil of relay 1 is obtained.As can be seen here, the leakage protection circuit not only dependable performance of the present embodiment, and also structure is simple, and cost-saving.
Circuits for triggering 4 comprise one-way SCR Q2, electric capacity C7.Wherein, the control pole of one-way SCR Q2 connects the trigger end of failure detector circuit 3, the described other end of the anode contact resistance R2 of one-way SCR Q2, the minus earth of one-way SCR Q2, and electric capacity C7 is connected in parallel on the negative electrode of one-way SCR Q2 and controls between pole.When the control pole of one-way SCR Q2 receives the high level signal of trigger end output of failure detector circuit 3, one-way SCR Q2 conducting, thus make the resistance R2 be connected with the anode of one-way SCR Q2 by one-way SCR Q2 ground connection, and then triode Q1 is turned off, the coil losing electricity of relay 1, the normally opened contact of relay 1 disconnects and described alternating current loop is disconnected.As can be seen here, the leakage protection circuit of the present embodiment also has the simple and cost-saving advantage of dependable performance, structure.
Reset circuit 5 comprises switch S 1, switch S 2, resistance R6, resistance R7 and one-way SCR Q3.Wherein, the anode of one-way SCR Q3 connects the DC output end positive pole of rectification circuit 6 by a resistance R5, the control pole of one-way SCR Q3 is connected with one end of switch S 2 through resistance R7, the negative electrode of one-way SCR Q3 is connected with one end of switch S 1 through resistance R6, the other end of switch S 2 connects the anode of one-way SCR Q3, the other end ground connection of switch S 1, switch S 1 is connected with the described other end of resistance R2 with the link of resistance R6.When coil power supply loop 2 is in off-state, the coil losing electricity of relay 1, in order to make the coil of relay 1 recover electric, needs to carry out reset operation.Particularly, first by switch S 1, switch S 2 successively conducting, the one-way SCR Q2 of circuits for triggering 4 is turned off then, and one-way SCR Q3 conducting, the described other end due to resistance R2 passes through switch S 1 ground connection of conducting, and triode Q1 is still in off state; Secondly, switch S 1, switch S 2 are successively turned off, one-way SCR Q3 is still in conducting state, the now described other end input high level of resistance R2, make triode Q1 conducting thus, the coil of relay 1 obtains electric, and the normally opened contact of relay 1 closes, and then makes described alternating current loop recover rapidly to connect after leak current fault is got rid of.
Failure detector circuit 3 comprises earth fault control chip U1, Current Transmit 1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, resistance R3 and resistance R4.The model of earth fault control chip U1 can adopt RV4145.Wherein, the power positive end 6 of earth fault control chip U1 connects the DC output end positive pole of rectification circuit 6 by a resistance R5, earth terminal 4 ground connection of earth fault control chip U1, the trigger end 5 of earth fault control chip U1 connects the input of circuits for triggering 4, the amplifier output 7 of earth fault control chip U1 connects one end of electric capacity C3 and one end of resistance R3 respectively, feedback voltage end 1 other end of contact resistance R3 and one end of resistance R4 respectively of earth fault control chip U1, the reference voltage end 3 of earth fault control chip U1 connects Current Transmit 1 output one end, the other end of electric capacity C3 connects one end of electric capacity C2 and one end of inductance L 1, the other end ground connection of electric capacity C2 respectively, and inductance L 1 is in parallel with electric capacity C2, Current Transmit 1 is set in described alternating current loop, and the output other end of Current Transmit 1 passes through the other end of electric capacity C5 contact resistance R4, and electric capacity C4 is connected in parallel between the output two ends of Current Transmit 1, one end of electric capacity C6 is connected with the power positive end 6 of earth fault control chip U1, the other end ground connection of electric capacity C6.Electric capacity C2, electric capacity C3 and inductance L 1 form accumulator; be connected with the amplifier output 7 of earth fault control chip U1 by C3; the amplifier output 7 of earth fault control chip U1 can be effectively received to export unnecessary electric energy like this; improve the reliability of earth fault control chip U1; and then make the leakage protection circuit reliability of the present embodiment higher, more effectively cut off described alternating current loop when there is earth fault.
Rectification circuit 6 comprises rectifier diode D1, and the anode tap of rectifier diode D1 connects the input live wire 1L of described alternating current, and the cathode terminal of rectifier diode D1 is DC output end positive pole.Described alternating current is through rectifier diode D1 rectification, then the filter capacitor filtering in subsequent conditioning circuit, provides direct current can to coil power supply loop 2, failure detector circuit 3 and reset circuit 4, simply efficient, and cost-saving.
As preferred embodiment; described leakage protection circuit also comprises earth fault test circuit 7; earth fault test circuit 7 comprises switch S 3 and resistance R8, one end ground connection of switch S 3, and the other end of switch S 3 connects the output live wire 2L of described alternating current by resistance R8.Console switch S1 conducting, can make described alternating current loop that analogue ground fault occurs, thus check the reliability of described leakage protection circuit.
As preferred embodiment, an also piezo-resistance R in parallel between the input live wire 1L in described alternating current loop and zero line 1N
v, can effectively prevent the higher interference voltage inputted from the input in described alternating current loop from causing damage to subsequent conditioning circuit.
Embodiment 2
Fig. 3 shows a kind of leakage protection circuit of the utility model embodiment 2; be with the difference of the described leakage protection circuit in embodiment 1, coil power supply loop 2 also comprises photoelectrical coupler U2, one-way SCR Q4, light-emitting diode D2, resistance R9, resistance R10 and resistance R11.
Wherein, the input anode of photoelectrical coupler U2 connects the output live wire 2L in described alternating current loop, the negative electrode of the input negative electrode connecting luminous diode D2 of photoelectrical coupler U2, the output collector electrode of photoelectrical coupler U2 connects the other end B of the coil of relay 1 and the negative electrode of one-way SCR Q4 respectively, and the output emitter of photoelectrical coupler U2 connects the control pole of one-way SCR Q4 and one end of resistance R9 respectively.The other end of resistance R9 connects the anode of one-way SCR Q4 and one end of resistance R11 respectively, and the other end of resistance R11 connects the other end B of the coil of relay 1.
When the input in described alternating current loop starts incoming transport electricity, one-way SCR Q4 conducting, the other end B being connected on the coil of coil power supply loop 2 repeat circuit 1 connects the DC output end positive pole of rectification circuit 6 by one-way SCR Q4, coil power supply loop 2 conducting, now the voltage of the coil input of relay 1 is larger.The coil of relay 1 obtains electric, the normally opened contact of relay 1 closes, thus make photoelectrical coupler U2 conducting, and then one-way SCR Q4 turns off, now the other end B of the coil of relay 1 connects the DC output end positive pole of rectification circuit 6 by resistance R11, resistance R11 carries out dividing potential drop to the coil of relay 1, and the voltage that the coil of relay 1 is inputted reduces.As can be seen here; when the input in described alternating current loop starts incoming transport electricity; the voltage of the coil input of relay 1 is larger; can ensure that the normally opened contact of relay 1 is by effective adhesive; after the normally opened contact of relay 1 is closed; by the effect of photoelectrical coupler U2; resistance R11 is made to carry out dividing potential drop to the coil of relay 1; thus ensure that the coil of relay 1 is damaged owing to inputting larger voltage for a long time; ensure the reliability in coil power supply loop 2, and then the reliability of the leakage protection circuit of raising the present embodiment.
Embodiment 3
Fig. 4 shows a kind of leakage protection circuit of the utility model embodiment 3, is with the difference of the described leakage protection circuit in above-described embodiment, and reset circuit 5 comprises switch S 1, resistance R6.One end of contact resistance R6 and one end of resistance R2 respectively, one end of switch S 1, the other end ground connection of switch S 1, the other end contact resistance R5 of resistance R6, the link of electric capacity C2.
When there is electric leakage, the control pole of the one-way SCR Q2 in circuits for triggering 4 receives the high level signal of the trigger end output of failure detector circuit 3, one-way SCR Q2 conducting, thus make the resistance R2 be connected with the anode of one-way SCR Q2 by one-way SCR Q2 ground connection, and then triode Q1 is turned off, the coil losing electricity of relay 1, the normally opened contact of relay 1 disconnects and described alternating current loop is disconnected.When needing to reset, turn off after switch S 1 conducting, during switch S 1 conducting, one-way SCR Q2 is turned off, and triode Q1 is in off-state, and the coil of circuit breaker 1, cannot adhesive still without electric; Switch S 1 is closed and is had no progeny, and the described other end input high level of resistance R2, makes triode Q1 conducting thus, and the coil of relay 1 obtains electric, and the normally opened contact of relay 1 closes, and then makes described alternating current loop recover rapidly to connect after leak current fault is got rid of.
When occurring to have a power failure, namely when the input live wire 1L in described alternating current loop and zero line 1N does not have alternating current to input, the coil losing electricity of relay 1, and one-way SCR Q2 is turned off.When power is restored, the described other end input high level of resistance R2, triode Q1 conducting, the coil of relay 1 obtains electric, thus realizes automatically reseting.As can be seen here, when the leakage protection circuit of the present embodiment 3 restores electricity after power failure, can realize automatically reseting.
By finding out compared with embodiment 1 or 2 the present embodiment 3, when needs realize described auto-reset function, only need modification circuits a little, printed board size and mechanical erection structure need not be changed, effectively human resources can not only be utilized in real production process, device resource, material resources, and can make a response to the order of client more efficiently.
Embodiment 4
Described leakage protection circuit in above-described embodiment can be applied to various earth leakage protective device.As the citing of the leakage protection circuit embody rule of above-described embodiment, the present embodiment 4 provides a kind of leakage protecting plug, and described leakage protecting plug comprises the leakage protection circuit described in above-described embodiment.
As another citing of the described leakage protection circuit embody rule of above-described embodiment, the present embodiment 4 also provides a kind of earth leakage protective socket, and described earth leakage protective socket comprises the leakage protection circuit described in above-described embodiment.
As another citing of the described leakage protection circuit embody rule of above-described embodiment, the present embodiment 4 also provides a kind of earth leakage circuit-breaker, and described earth leakage circuit-breaker comprises the leakage protection circuit described in above-described embodiment.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And thus the apparent change of extending out or variation be still among the protection range that the utility model creates.
Claims (10)
1. a leakage protection circuit; for disconnecting alternating current loop when there is earth fault; it is characterized in that: described leakage protection circuit comprises relay, coil power supply loop, failure detector circuit, circuits for triggering, reset circuit and rectification circuit; between the input that the normally opened contact of described relay is connected on described alternating current loop and output; the coils connected in series of described relay is in described coil power supply loop; wherein
Described coil power supply loop is used for the coil power supply of described relay;
Described failure detector circuit is used for producing triggering signal when earth fault being detected and outputting to described circuits for triggering;
Described circuits for triggering are used for disconnecting described coil power supply loop when receiving described triggering signal to make the coil losing electricity of described relay, thus described normally opened contact disconnects to make described alternating current loop disconnect;
It is electric to make the coil of described relay obtain that described reset circuit is used for coil power supply loop described in conducting, thus described normally opened contact is closed to make described alternating current loop recover conducting;
Described rectification circuit is used for described alternating current being converted to direct current to power to described coil power supply loop, described failure detector circuit and described reset circuit.
2. leakage protection circuit according to claim 1, is characterized in that: described failure detector circuit comprises earth fault control chip U1, Current Transmit 1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, resistance R3 and resistance R4,
The power positive end 6 of earth fault control chip U1 connects the DC output end positive pole of described rectification circuit by a resistance R5, earth terminal 4 ground connection of earth fault control chip U1, the trigger end 5 of earth fault control chip U1 connects the input of described circuits for triggering, the amplifier output 7 of earth fault control chip U1 connects one end of electric capacity C3 and one end of resistance R3 respectively, feedback voltage end 1 other end of contact resistance R3 and one end of resistance R4 respectively of earth fault control chip U1, the reference voltage end 3 of earth fault control chip U1 connects Current Transmit 1 output one end,
The other end of electric capacity C3 connects one end of electric capacity C2 and one end of inductance L 1, the other end ground connection of electric capacity C2 respectively, and inductance L 1 is in parallel with electric capacity C2;
Current Transmit 1 is set in described alternating current loop, and the output other end of Current Transmit 1 passes through the other end of electric capacity C5 contact resistance R4, and electric capacity C4 is connected in parallel between the output two ends of Current Transmit 1;
One end of electric capacity C6 is connected with the power positive end 6 of earth fault control chip U1, the other end ground connection of electric capacity C6.
3. leakage protection circuit according to claim 1; it is characterized in that: described leakage protection circuit also comprises earth fault test circuit; described earth fault test circuit comprises switch S 3 and resistance R8; one end ground connection of switch S 3, the other end of switch S 3 connects the output live wire of described alternating current by resistance R8.
4. leakage protection circuit according to claim 1, is characterized in that: described coil power supply loop comprises triode Q1, filter capacitor C1, resistance R1 and resistance R2,
The grounded emitter of triode Q1, base stage one end of contact resistance R1 and one end of resistance R2 respectively of triode Q1, the collector electrode of triode Q1 connects one end A of the coil of described relay;
The other end B of the coil of described relay connects the DC output end positive pole of described rectification circuit;
The other end ground connection of resistance R1, the other end of resistance R2 is connected with described reset circuit with described circuits for triggering respectively;
One end of filter capacitor C1 connects the other end B of the coil of described relay, the other end ground connection of filter capacitor C1.
5. leakage protection circuit according to claim 4; it is characterized in that: described circuits for triggering comprise one-way SCR Q2, electric capacity C7; the control pole of one-way SCR Q2 connects the trigger end of described failure detector circuit; the described other end of the anode contact resistance R2 of one-way SCR Q2; the minus earth of one-way SCR Q2, electric capacity C7 is connected in parallel on the negative electrode of one-way SCR Q2 and controls between pole.
6. leakage protection circuit according to claim 4, is characterized in that: described reset circuit comprises switch S 1, switch S 2, resistance R6, resistance R7 and one-way SCR Q3,
The anode of one-way SCR Q3 connects the DC output end positive pole of described rectification circuit by a resistance R5, the control pole of one-way SCR Q3 is connected with one end of switch S 2 through resistance R7, the negative electrode of one-way SCR Q3 is connected with one end of switch S 1 through resistance R6
The other end of switch S 2 connects the anode of one-way SCR Q3, and the other end ground connection of switch S 1, switch S 1 is connected with the described other end of resistance R2 with the link of resistance R6.
7. the leakage protection circuit according to any one of claim 1-6; it is characterized in that: described rectification circuit comprises rectifier diode D1; the anode tap of rectifier diode D1 connects the input live wire of described alternating current, and the cathode terminal of rectifier diode D1 is DC output end positive pole.
8. a leakage protecting plug, is characterized in that: described leakage protecting plug comprises the leakage protection circuit described in any one of claim 1-7.
9. an earth leakage protective socket, is characterized in that: described earth leakage protective socket comprises the leakage protection circuit described in any one of claim 1-7.
10. an earth leakage circuit-breaker, is characterized in that: described earth leakage circuit-breaker comprises the leakage protection circuit described in any one of claim 1-7.
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| CN201520231748.2U CN204464951U (en) | 2015-04-16 | 2015-04-16 | Leakage protection circuit, plug, socket and switch |
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| CN201520231748.2U CN204464951U (en) | 2015-04-16 | 2015-04-16 | Leakage protection circuit, plug, socket and switch |
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| CN104953537A (en) * | 2015-07-27 | 2015-09-30 | 福一开电气有限公司 | Overload protection switching device |
| CN108885234A (en) * | 2016-03-23 | 2018-11-23 | 伊顿智能动力有限公司 | Adapter for detecting electric equipment |
| CN108885234B (en) * | 2016-03-23 | 2021-05-28 | 伊顿智能动力有限公司 | Adapter for testing electrical devices |
| CN106026015A (en) * | 2016-08-02 | 2016-10-12 | 德力西电气有限公司 | Line overvoltage protection circuit with overvoltage alarm tripping function |
| CN106026015B (en) * | 2016-08-02 | 2018-11-27 | 德力西电气有限公司 | A kind of Line over-voltage protection circuit with over voltage alarm tripping |
| CN109149282A (en) * | 2018-07-13 | 2019-01-04 | 中山市浪网中学 | A kind of socket circuit structure with automatic control function |
| CN110739589A (en) * | 2018-07-21 | 2020-01-31 | 佛山市顺德区信辉达电子有限公司 | Intelligent leakage protection plug with leakage protection function failure re-protection function |
| CN110297151A (en) * | 2019-05-24 | 2019-10-01 | 温州华亚电气有限公司 | A kind of observation circuit protection circuit of ground fault earth leakage protective device operation troubles |
| CN110297151B (en) * | 2019-05-24 | 2022-04-08 | 温州华亚电气有限公司 | Monitoring circuit protection circuit for operation fault of earth fault leakage protector |
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