CN113972626A

CN113972626A - Novel leakage protector

Info

Publication number: CN113972626A
Application number: CN202111199380.2A
Authority: CN
Inventors: 罗革; 沈涛
Original assignee: Ningbo Beilei Technology Co ltd
Current assignee: Ningbo Beilei Technology Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-01-25

Abstract

The utility model relates to a novel leakage protector, which relates to the technical field of electric appliance connectors, and comprises a circuit board, a coil which is arranged on the circuit board and is used for generating a magnetic field, and a plug which is electrically connected with the coil and is used for inserting a socket, wherein the circuit board is provided with a contact piece which is electrically connected with the plug and an electrified piece which is used for outputting current; the circuit board is provided with a control circuit for leakage protection, and when the circuit board outputs a leakage signal, the control circuit outputs a power-off signal to the coil to separate the contact piece from the power-on piece. The leakage protector has the effect that the leakage protector can be used at low power.

Description

Novel leakage protector

Technical Field

The application relates to the field of electric appliance connector technology, in particular to a novel leakage protector.

Background

With the progress of science and technology, people gradually increase the protection consciousness of the electrical appliance against fire and electric leakage, and the leakage protector is introduced to reduce the situation that the electric appliance is subjected to joint leakage in the using process.

In the correlation technique, earth leakage protector is including coil and the dropout structure that is used for producing magnetic field, and when the electric leakage condition appeared, the produced magnetic field of coil changes and leads to the dropout structure effect to make electrical apparatus outage in order to play the guard action, the rated power of earth leakage protector is greater than 1W under the normal conditions, in order to satisfy earth leakage protector's work demand.

In view of the above-mentioned related technologies, the inventor believes that the power required by the above-mentioned earth leakage protector in the use process is large, and when the power of the use environment is small, the above-mentioned earth leakage protector cannot meet the use requirement.

Disclosure of Invention

In order to enable the leakage protector to be used at low power, the application provides a novel leakage protector.

The application provides a novel earth-leakage protector adopts following technical scheme:

a novel leakage protector comprises a circuit board, a coil and a plug, wherein the coil is arranged on the circuit board and used for generating a magnetic field, the plug is electrically connected with the coil and used for being inserted into a socket, a contact piece electrically connected with the plug and an electrified piece used for outputting current are arranged on the circuit board, a pressing assembly used for controlling the movement of the electrified piece is arranged on the circuit board, the pressing assembly comprises a suction needle capable of being attracted by the magnetic field of the coil, the suction needle is provided with a first station and a second station, when the suction needle is positioned at the first station, the coil and the suction needle have no effect, at the moment, the contact piece is separated from the electrified piece, when the suction needle is positioned at the second station, the coil and the suction needle are attracted, and at the moment, the contact piece is abutted to the electrified piece; the circuit board is provided with a control circuit for leakage protection, and when the circuit board outputs a leakage signal, the control circuit outputs a power-off signal to the coil so as to separate the contact piece from the power-on piece.

By adopting the technical scheme, when the plug is inserted into the socket, the coil is electrified to generate a magnetic field, if the suction needle is moved to move from the first station to the second station, the magnetic field generated by the coil can attract the suction needle, so that the contact piece is abutted against the electrifying piece, and the current on the contact piece can be transmitted to the electrifying piece at the moment, so that the electrifying piece can output the current to act on each electric appliance; when the circuit board has an electric leakage phenomenon and outputs an electric leakage signal to the control circuit, the control circuit can output a power-off signal to the coil, and at the moment, the magnetic field generated by the coil is changed to cause the contact piece and the electrified piece to be separated, so that the electric appliance electrically connected with the electrified piece is powered off, and the protection of the electric appliance is realized; above-mentioned technical scheme only need the produced magnetic field of coil can to inhale the needle can, the accessible changes inhale needle weight and coil number of turns in order to satisfy the demand, can make earth-leakage protector's rated power reduce after the coil number of turns reduces to make earth-leakage protector can use when the low-power.

Optionally, the control circuit includes:

the AC-DC voltage reduction module is connected with the mains supply and used for receiving a normal voltage signal and outputting a working voltage signal when the AC-DC voltage reduction module receives the normal voltage signal;

the detection module is connected with the circuit board and used for receiving the leakage signal and outputting an abnormal voltage signal when the detection module receives the leakage signal;

and the power-off module is connected with the output end of the AC-DC voltage reduction module and the output end of the detection module and used for receiving the working voltage signal and the abnormal voltage signal, and when the power-off module receives the working voltage signal and the abnormal voltage signal at the same time, the power-off module outputs a power-off signal to the coil.

Through adopting above-mentioned technical scheme, under the effect of AC/DC voltage reduction module, the AC high voltage that live wire zero line was exported can turn into the DC low voltage and transmit this DC low voltage to the outage module in, so that the outage module can normally work, detection module is arranged in judging the condition whether the electric leakage appears on the circuit board, when detection module detected the electric leakage signal, output abnormal voltage signal transmits to in the outage module, the outage module can export the outage signal to the coil under the effect of operating voltage signal and abnormal voltage signal this moment, make the produced magnetic field of coil change.

Optionally, the circuit board is provided with an indicator lamp, the control circuit further comprises an indicator module, the indicator module is connected with a mains supply and used for receiving a normal voltage signal, the indicator lamp is connected with the indicator module in series, and when the indicator module receives the normal voltage signal, the indicator lamp is turned on.

Through adopting above-mentioned technical scheme, the pilot lamp is used for the holistic indicative function of earth-leakage protector, and the user can be through the operating condition who judges the state of pilot lamp in order to judge earth-leakage protector to the user controls the operation to earth-leakage protector.

Optionally, the circuit board is provided with a reset switch, the control circuit further comprises a reset module, the reset module is respectively connected with the mains supply and the detection module and used for receiving normal voltage signals, the reset switch is connected in series with the reset module, the reset switch has a connection state and a disconnection state, when the reset module receives the normal voltage signals and the reset switch is in the connection state, the reset module outputs analog signals to the detection module, at the moment, the detection module outputs abnormal voltage signals, and when the reset switch is in the disconnection state, the reset module does not work.

Through adopting above-mentioned technical scheme, when the user need be with the electrical apparatus outage that uses, accessible extrusion reset switch and make reset switch convert the connected state into by the off-state, and the module that resets this moment can export analog signal to detection module in, makes detection module can export the condition that abnormal voltage signal appears the electric leakage with the analog circuit board to make earth-leakage protector can cut off the power supply, and then realize the outage of the electrical apparatus that earth-leakage protector connects.

Optionally, the power-off module includes:

the enabling unit is connected with the output end of the detection module and used for receiving the abnormal voltage signal, and when the enabling unit receives the abnormal voltage signal, the enabling unit outputs an enabling signal;

the chip unit is connected with the output end of the enabling unit and used for receiving the enabling signal and outputting a driving signal when the chip unit receives the enabling signal;

and the driving unit is connected with the output end of the chip unit and used for receiving the driving signal, and outputting a power-off signal when the driving unit receives the driving signal.

By adopting the technical scheme, the abnormal voltage signal output by the detection module can be received by the enabling unit, at the moment, the enabling unit can output the enabling signal in the chip unit, so that the chip unit can be normally started to output the driving signal, the driving signal output by the chip is transmitted to the driving unit, the driving unit can output the power-off signal to the coil, and the magnetic field generated by the coil is changed.

Optionally, the pressing assembly further comprises a fixing shell arranged on the circuit board, an extrusion block is connected in the fixing shell in a sliding mode, the suction needle is arranged at one end, close to the coil, of the extrusion block and penetrates through the fixing shell, a clamping block for the suction needle to penetrate through is connected to the power-on sheet, a bending portion is arranged on the suction needle, and when the suction needle is located at the second station, the bending portion is connected with the clamping block in a clamping mode.

Through adopting above-mentioned technical scheme, when needs make circular telegram piece output current, extrusion piece makes extrusion piece can slide in the set casing, and the suction needle can follow the extrusion piece and remove and make the produced magnetic field of coil can attract the effect to the suction needle this moment, and when the suction needle was in the second station, kink and fixture block joint, the suction needle position was comparatively fixed this moment to improve the stability of suction needle in the use.

Optionally, the coil is connected with a limiting rod in a sliding manner, and a limiting hole for inserting the suction needle is formed in the side wall of the limiting rod.

By adopting the technical scheme, when the coil attracts the suction needle, the suction needle drives the limiting rod to move so that the limiting rod can move on the coil, and at the moment, a gap exists between the suction needle and the coil and the gap is fixed, so that the suction needle can be separated from a magnetic field generated by the coil conveniently when the voltage of a subsequent coil changes.

Optionally, a spring is clamped between the squeezing block and the fixed shell along the moving direction of the squeezing block, the spring is sleeved on the outer surface of the suction needle, an inclined guide surface facing the direction of the squeezing block is arranged on the bending portion, and the guide surface abuts against the fixture block.

Through adopting above-mentioned technical scheme, when the magnetic field of coil changed, the extrusion piece can remove to the direction of keeping away from the coil under the effect of spring, inhales the needle this moment and can follow the extrusion piece and remove because of the existence of guide face to make and inhale the needle and can remove to first station from the second station, in order to realize the outage of circular telegram piece.

Optionally, the portable electronic device further comprises a front shell and a rear shell, the front shell and the rear shell are enclosed to form a storage cavity for placing a circuit board, a screw penetrates through the front shell and the rear shell, penetrating holes corresponding to the extrusion blocks, the reset switch and the indicator lamps one to one are formed in the rear shell, soft rubber sleeves are arranged on the penetrating holes, and the outer surfaces of the extrusion blocks and the reset switch are arranged in the soft rubber sleeves.

By adopting the technical scheme, the arrangement of the front shell and the rear shell enables components such as the circuit board to be built in, so that the components such as the circuit board can be protected in the using process, and the possibility of damage to the circuit board is reduced; the setting up of through-hole makes extrusion reset switch and the extrusion piece that the user can be comparatively convenient, and the user of being convenient for operates earth-leakage protector, makes the user externally observe the state of pilot lamp simultaneously, and the setting up of soft gum cover makes the user feel the preferred when extrusion reset switch and extrusion piece, improves user experience.

Optionally, the inside wall of preceding shell is provided with a plurality of butt post, butt post butt is provided with the surface of coil on the circuit board, the one end that is close to the backshell on the butt post is provided with the reference column, set up the constant head tank that supplies the reference column to peg graft one by one on the circuit board.

Through adopting above-mentioned technical scheme, at the in-process of circuit board installation, through butt post butt in order to realize the axial fixity of circuit board in the storage intracavity in the circuit board, the reference column is pegged graft in the constant head tank, makes the circuit board radially fixed in the storage intracavity to realize the circuit board fixed in the storage intracavity, reduce earth-leakage protector when the staff's installation of being convenient for and the condition that the circuit board removed takes place in the use, improve earth-leakage protector's stability in the use.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the number of turns of the coil can be reduced by the change of the control circuit, the coil and the suction needle, so that the leakage protector can be used at low power;

2. the AC-DC voltage reduction module enables AC high voltage to be converted into DC low voltage so as to reduce the occurrence of the situation that the circuit board is broken down by high voltage in the using process.

Drawings

Fig. 1 is a schematic structural diagram of a novel earth leakage protector according to an embodiment of the present application;

fig. 2 is a schematic diagram showing an explosion structure of the novel earth leakage protector according to the embodiment of the present application;

FIG. 3 is a schematic diagram of an exploded view of a compression assembly in accordance with an embodiment of the present application;

fig. 4 is a schematic diagram of an explosion structure of the novel earth leakage protector according to the embodiment of the present application;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a circuit diagram of an AC/DC buck module of the control circuit according to the embodiment of the present disclosure;

FIG. 7 is a circuit diagram of a detection module of the control circuit in an embodiment of the present application;

FIG. 8 is a circuit diagram of an enable unit of a control circuit in an embodiment of the present application;

fig. 9 is a circuit diagram of a chip unit and a driving unit of a control circuit in the embodiment of the present application.

Description of reference numerals: 1. a circuit board; 2. a coil; 3. a plug; 4. a contact piece; 5. a power-on sheet; 6. sucking a needle; 7. an indicator light; 8. a reset switch; 9. a stationary case; 10. extruding the block; 11. a clamping block; 12. a bending section; 13. a limiting rod; 14. a limiting hole; 15. a spring; 16. a guide surface; 17. a front housing; 18. a rear housing; 19. a through hole; 20. a soft rubber sleeve; 21. a butting post; 22. a positioning column; 23. positioning a groove; 24. an AC-DC voltage reduction module; 25. a detection module; 26. an indication module; 27. a reset module; 28. an enabling unit; 281. an enable subunit; 282. a processing subunit; 29. a chip unit; 30. a drive unit.

Detailed Description

The present application is described in further detail below with reference to figures 1-9.

The embodiment of the application discloses a novel leakage protector. Referring to fig. 1 and 2, the novel earth leakage protector comprises a front shell 17 and a rear shell 18, wherein opposite end faces of the front shell 17 and the rear shell 18 are recessed inwards to form a storage cavity when the front shell 17 and the rear shell 18 are enclosed, and a screw passes through the front shell 17 and is in threaded connection with the rear shell 18 to realize fixation between the front shell 17 and the rear shell 18. The front shell 17 is fixedly provided with a plug 3 for inserting into a socket, the memory is internally provided with a circuit board 1, the circuit board 1 is fixedly provided with a coil 2 towards the end face of the plug 3, the coil 2 comprises a conductive part and an insulating part, the insulating part is fixedly connected onto the circuit board 1 through glue, the conductive part is connected with the output end of the plug 3 through a lead, the conductive part is wound with a plurality of turns of copper wires, and when the conductive part is electrified, the coil 2 can integrally generate a magnetic field.

Referring to fig. 2 and 3, a contact piece 4 is fixedly mounted on the surface of the circuit board 1 on which the coil 2 is disposed, the contact piece 4 itself is electrically conductive, and the contact piece 4 is connected to the output end of the plug 3 by a wire, so that the current on the plug 3 can be transmitted to the contact piece 4. The terminal surface fixed mounting that is provided with contact piece 4 on circuit board 1 has circular telegram piece 5, and circular telegram piece 5 is elastic sheet and self electrically conductive, and the one end of keeping away from circuit board 1 on circular telegram piece 5 sets up with contact piece 4 relatively and has the certain distance between contact piece 4 and the circular telegram piece 5, and the connection of accessible wire is in order to realize the power supply of each electrical apparatus on circular telegram piece 5. Fixed mounting has the extrusion subassembly on circuit board 1, the extrusion subassembly is including inhaling needle 6 and the fixed casing 9 of fixed mounting on circuit board 1 that can be attracted by the produced magnetic field of coil 2, the terminal surface of keeping away from coil 2 on the fixed casing 9 is inwards sunken, it is connected with extrusion piece 10 to slide in fixed casing 9, extrusion piece 10 can move along the sunken direction of fixed casing 9, the lateral wall of extrusion piece 10 has outside chimb, this chimb cooperatees with fixed casing 9 depressed part and makes extrusion piece 10 be difficult for breaking away from on fixed casing 9.

The suction needle 6 is fixedly mounted on the end face of the pressing block 10 facing the bottom face of the recess of the fixing shell 9, the suction needle 6 penetrates through the fixing shell 9, the suction needle 6 is arranged perpendicular to the circuit board 1, the suction needle 6 is provided with a bent part 12, the upper section and the lower section of the suction needle 6 are formed into two sections which are parallel to each other, the bent part 12 is provided with an inclined guide surface 16, and the guide surface 16 faces the coil 2 and the circuit board 1. The clamping block 11 is fixedly mounted at one end, opposite to the contact piece 4, of the electrifying piece 5, the clamping block 11 is not conductive, the suction needle 6 penetrates through the clamping block 11, the suction needle 6 is provided with a first station and a second station, when the suction needle 6 is located at the first station, the lower section of the suction needle 6 abuts against the side wall of the hole, formed in the clamping block 11 and penetrated by the suction needle 6, and when the suction needle 6 is located at the second station, the upper section of the suction needle 6 abuts against the side wall of the hole, formed in the clamping block 11 and penetrated by the suction needle 6. A spring 15 is clamped between the bottom surface of the concave part of the fixed shell 9 and the extrusion block 10, the spring 15 is sleeved on the outer surface of the suction needle 6, the spring 15 has a natural state and a compression state, when the spring 15 is in the natural state, the suction needle 6 is in a first working position, and when the spring 15 is in the compression state, the suction needle 6 is in a second working position.

When the suction needle 6 is moved downwards by an external force, the suction needle 6 can be moved from the first station to the second station, at this time, the bent portion 12 of the suction needle 6 penetrates through the fixture block 11 and enables the upper section of the suction needle 6 to abut against the side wall of the hole, through which the suction needle 6 penetrates, of the fixture block 11, under the action of the guide surface 16, the suction needle 6 approaches towards the coil 2, so that the magnetic field attraction force applied to the suction needle 6 is enhanced, the suction needle 6 is attracted towards the coil 2 and approaches towards the coil 2, at this time, if the external force on the suction needle 6 disappears, the return force of the spring 15 and the magnetic field attraction force of the suction needle 6 simultaneously enable the suction needle 6 to drive the fixture block 11 to move towards the circuit board 1 and to achieve the clamping between the suction needle 6 and the fixture block 11, so that the conducting piece 5 moves towards the direction of the contact piece 4 until the conducting piece 5 abuts against the contact piece 4, and at this time, the current on the contact piece 4 can be transmitted to the conducting piece 5. When the voltage on the circuit board 1 is abnormal, the control circuit arranged in the circuit board 1 can output a power-off signal to the coil 2, so that the magnetic field of the coil 2 changes, the magnetic field suction force applied to the suction needle 6 is reduced, the suction needle 6 can move to the first station from the second station under the action of the spring 15, and the power-on piece 5 is separated from the contact piece 4, so that the power-off of an electric appliance connected with the power-on piece 5 is realized. The rated power of the whole leakage protector can be changed by changing the number of turns of the copper wire of the coil 2, when the rated power is smaller than 0.5W, the number of turns of the copper wire of the coil 2 is reduced, and at the moment, the weight of the suction needle 6 is only required to be changed to meet the requirement of being attracted by the magnetic field generated by the coil 2.

In order to enable the suction needle 6 to be separated from the magnetic field when the magnetic field changes, a limiting rod 13 is connected to the coil 2 in a sliding mode along the axial direction, the limiting rod 13 extends out of the coil 2 and faces the end face of the clamping block 11, a limiting hole 14 for the suction needle 6 to penetrate through is formed in the limiting rod 13, the cross section of the limiting hole 14 is circular, the axis of the limiting hole 14 is perpendicular to the length direction of the limiting rod 13, and when the suction needle 6 is located at a first station, the suction needle 6 is inserted into the limiting hole 14. When the suction needle 6 moves towards the coil 2 under the action of the magnetic field, the suction needle 6 drives the limiting rod 13 to slide on the coil 2, and when the limiting rod 13 abuts against the bottom surface of the groove corresponding to the sliding connection, the limiting rod 13 cannot move continuously, so that the distance between the suction needle 6 and the coil 2 is fixed, and the suction needle 6 can be separated from the magnetic field generated by the coil 2 under the action of the spring 15 when the magnetic field generated by the coil 2 changes.

In order to make the user can carry out the outage processing to the electrical apparatus that earth-leakage protector connects, fixed mounting has reset switch 8 on circuit board 1, reset switch 8 is connected with control circuit electricity, reset switch 8 has connected state and off-state, when reset switch 8 is in the off-state, normal work such as circuit board 1 and coil 2, when reset switch 8 is in connected state, control circuit can export outage signal so that circular telegram piece 5 and contact piece 4 break off, the electrical apparatus outage of being connected with circular telegram piece 5 electricity this moment, it need not to pull out earth-leakage protector from the socket when handling to the electrical apparatus outage to make the user need, and convenient user uses. Fixed mounting has pilot lamp 7 on circuit board 1, and pilot lamp 7 is connected with control circuit electricity, and when control circuit got electric, pilot lamp 7 lighted in order to show earth-leakage protector is in the on-state, and the electrical apparatus that is connected with earth-leakage protector was in the on-state this moment, and when pilot lamp 7 went out, the explanation was in the outage state with the electrical apparatus that earth-leakage protector is connected.

Referring to fig. 2, in order to facilitate the user to extrude the reset switch 8 and the extrusion block 10, penetrating holes 19 are respectively formed in positions of the rear shell 18 opposite to the reset switch 8, the extrusion block 10 and the indicator light 7, the reset switch 8 and the extrusion block 10 extend out of the surface of the rear shell 18, and the user can extrude the reset switch 8 and the extrusion block 10 through the penetrating holes 19 and observe the state of the indicator light 7 through the penetrating holes 19. Demountable installation has soft gum cover 20 on penetrating hole 19, and soft gum cover 20 is made by the soft material that does not electrically conduct, and soft gum cover 20 butt realizes the fixed of soft gum cover 20 position on reset switch 8 and backshell 18 inside wall, and the user is when extrusion reset switch 8 and extrusion piece 10, and soft gum cover 20 makes the user feel preferred, has improved user's use and has experienced.

Referring to fig. 4 and 5, in order to fix the circuit board 1 in the storage cavity, a plurality of abutting posts 21 are integrally formed on a side wall of the front shell 17 facing the rear shell 18, the abutting posts 21 are perpendicular to the side wall of the front shell 17 facing the rear shell 18, when the circuit board 1 is installed, the circuit board 1 can abut against the abutting posts 21, and after the front shell 17 and the rear shell 18 are enclosed and installed, the circuit board 1 is fixed along the axial direction of the front shell 17 and the rear shell 18 under the action of the pressing component and the abutting posts 21, so that the circuit board 1 is not easy to approach towards the direction of the front shell 17 or the rear shell 18. A positioning column 22 is integrally formed on the abutting column 21 close to the end face of the rear shell 18, a positioning groove 23 is formed in the position, opposite to the positioning column 22, of the circuit board 1, and when the positioning column 22 is inserted into the positioning groove 23, the circuit board 1 is not easy to move in the radial direction in the storage cavity, so that the circuit board 1 can be installed in the storage cavity and can be fixed.

Referring to fig. 6, the control circuit includes: and the AC/DC voltage reduction module 24 is connected with the mains supply and used for receiving the normal voltage signal, and when the AC/DC voltage reduction module 24 receives the normal voltage signal, the working voltage signal is output. The ac-dc voltage reduction module 24 includes: the first chip U1, the model of first chip U1 is KP3114WPA, first chip U1 has seven pins, and the "1" foot is connected with the live wire in the commercial power, is established ties between live wire and the "1" foot and has first resistor R1, for current-limiting resistance, the model can be 22R2W, reduces the condition that first chip U1 is punctured and takes place, "6" foot is connected with the zero line in the commercial power, establish ties between zero line and the "6" foot and has first capacitor C1, and the zero line ground connection. A second capacitor C2, a second resistor R2 and a third resistor R3 are connected in parallel between the wires connected with the pin 1 and the pin 6, the second resistor R2 and the third resistor R3 are connected in series, the second capacitor C2 is connected in parallel with the second resistor R2 and the third resistor R3, the second capacitor C2, the second resistor R2 and the third resistor R3 are connected to enable filtering rectification before commercial power is input into the first chip U1, and a piezoresistor RV, which can be 7D471 in type, is connected in parallel between the wires connected with the pin 1 and the pin 6 for adjusting the current magnitude connected to the first chip U1.

The "7" pin is electrically connected to the "6" pin with a first inductor L1 in series therebetween, and the first inductor L1 is connected in series with a first capacitor C1, with the "5" pin being directly grounded. The pin "2" is connected in series with the second inductor L2 and the third capacitor C3 and then grounded, the second inductor L2 is a transformation inductance, the model can be EE10, a fourth resistor R4 is connected between the second inductor L2 and the third capacitor C3, the fourth resistor R4 is connected in parallel with the third capacitor C3, the fourth resistor R4 is connected in series with the second inductor L2, the pin "3" is connected in series with the fourth capacitor C4 and then connected in series with the second inductor L2, the pin "4" is connected in series with the fifth resistor R5 and then connected in series with the second inductor L2, and the pin "4" is connected in parallel with the sixth resistor R6 between the pin "4" and the second inductor L2. The first chip U1 receives the normal voltage signal outputted from the commercial power through the "1" pin and the "6" pin, and outputs a dc low voltage signal after being processed by the second inductor L2, where the signal is the working voltage signal.

Referring to fig. 7, the control circuit further includes: a detection module 25, a reset module 27 and an indication module 26. The detection module 25 is connected to the circuit board 1, and is configured to receive the leakage signal, and output an abnormal voltage signal when the detection module 25 receives the leakage signal. The detection module 25 is a leakage detector ZCT connected to the circuit board 1, and when leakage occurs on the circuit board 1, a circuit on the circuit board 1 can be transmitted to the leakage detector ZCT.

The reset module 27 is connected to the commercial power and the detection module 25, respectively, and is configured to receive the normal voltage signal. In the reset module 27, the live wire is connected with one end of the leakage detector ZCT after being connected with the seventh resistor R7 and the eighth resistor R8 in series, the zero wire is connected with the other end of the leakage detector ZCT after being connected with the reset switch 8 in series, and the reset switch 8 is in a normally open state. When the reset switch 8 is closed, the two ends of the leakage detector ZCT are connected with the live line and the zero line, respectively, so that the leakage detector ZCT is powered to output an abnormal voltage signal.

The indication module 26 is connected to the mains for receiving the normal voltage signal. The live wire is connected with the zero line after being connected in series with ninth resistor R9, tenth resistor R10, first diode D1 and pilot lamp 7 in proper order in the instruction module 26, and pilot lamp 7 is emitting diode, and the circulated direction of first diode D1 and emitting diode's electric current is flowed to the zero line by the live wire, and when pilot lamp 7 and commercial power were connected, pilot lamp 7 lighted.

Referring to fig. 8 and 9, the control circuit further includes: and the power-off module is connected with the output end of the AC-DC voltage reduction module 24 and the output end of the detection module 25 and used for receiving the working voltage signal and the abnormal voltage signal and outputting a power-off signal to the coil 2 when the power-off module receives the working voltage signal and the abnormal voltage signal simultaneously. The power-off module includes: the enable unit 28 is connected with the output end of the detection module 25 and is used for receiving the abnormal voltage signal, and when the enable unit 28 receives the abnormal voltage signal, the enable unit 28 outputs the enable signal; the chip unit 29 is connected with the output end of the enabling unit 28 and used for receiving an enabling signal, and when the chip unit 29 receives the enabling signal, a driving signal is output; and the driving unit 30 is connected with the output end of the chip unit 29 and used for receiving the driving signal, and outputting a power-off signal when the driving unit 30 receives the driving signal.

The chip unit 29 is a second chip U2, the model number of the second chip U2 is GD54321, and the second chip U2 has eight pins for connecting with peripheral circuits. The enabling unit 28 includes an enabling subunit 281 connected to the ac-dc voltage dropping module 24 for receiving the operating voltage signal and a processing subunit 282 connected to the detecting unit for receiving the abnormal voltage signal, the enabling subunit 281 includes a first PNP triode Q1, which may be of the type PMBT3906, a base stage of the first PNP triode Q1 is connected to the output terminal of the ac-dc voltage dropping module 24 after being serially connected to an eleventh resistor R11 and a twelfth resistor R12 in sequence, a base stage of the first PNP triode Q1 is connected to the thirteenth resistor R13 in series and then grounded, and an emitter of the first PNP triode Q1 is connected to the base stage of the first PNP triode Q1 after being serially connected to a fifth capacitor C5. The collector of the first PNP triode Q1 is connected in series with the second diode D2 and then connected to the "5" pin of the second chip U2, the second diode D2 is connected in series with the sixth capacitor C6 and then grounded, the current of the second diode D2 flows from the collector of the first PNP triode Q1 to the "5" pin of the second chip U2, and the voltage processed by the ac/dc voltage reduction module 24 can be transmitted to the second chip U2 to enable the second chip U2 to work normally.

The processing subunit 282 includes: a fourteenth resistor R14 connected between the "1" pin of the second chip U2 and one end of the leakage detector ZCT, and a fifteenth resistor R15 connected between the "2" pin of the second chip U2 and the other end of the leakage detector ZCT, a sixteenth resistor R16 and a seventh capacitor C7 are connected in parallel to a circuit connected to the "1" pin and the "2" pin of the second chip U2, an eighth capacitor C8 is connected in series to a circuit connected to the "1" pin of the second chip U2 and then grounded, a ninth capacitor C9 is connected in series to a circuit connected to the "2" pin of the second chip U2 and then grounded, the "3" pin and the "4" pin of the second chip U2 are both connected to an internal ground, and the "3" pin and the "4" pin of the second chip U2 are connected in series to the same seventeenth resistor R17 and then grounded. When the abnormal voltage signal output by the detection module 25 is input to the second chip U2 through the processing sub-unit 282, the second chip U2 can output a driving signal.

The driving unit 30 includes: a second PNP triode Q2, the base of the second PNP triode Q2 is connected in series with the eighteenth resistor R18 and then connected to the pin "7" of the second chip U2, the emitter of the second PNP triode Q2 is connected in series with the tenth capacitor C10 and then connected to ground, the collector of the second PNP triode Q2 is connected in series with the third diode D3 and then connected to ground, the current of the third diode D3 flows to the collector of the second PNP triode Q2 from ground, a first terminal P1 for outputting the power-off signal is connected between the collector of the second PNP triode Q2 and the third diode D3, a second terminal P2 is provided opposite to the first terminal P1, and the first terminal P1 and the second terminal P2 are respectively connected to two ends of the coil 2. An mosfet Q3, which is of a P-channel enhancement type and may be of a type BSS84LT1G, a G-pole of the mosfet Q3 is connected in series with an eleventh capacitor C11 and then connected to a collector of the second PNP transistor Q2, a nineteenth resistor R19 is connected in series between the G-pole of the MOS fet Q3 and an emitter of the second PNP transistor Q2, one end of the nineteenth resistor R19 is connected between the G-pole of the MOS fet Q3 and the eleventh capacitor C11, an S-pole of the MOS fet Q3 is grounded, D-poles of the MOS fet Q3 are connected to an emitter of the second PNP transistor Q2 and an "8" pin of the second chip U2, respectively, and the driving signal is transmitted to the driving unit 30 through the "7" pin and the "8" pin of the second chip U2.

The control circuit of the embodiment of the application has the technical effects that: the normal voltage signal output by the utility power is output as a working voltage signal in a form of direct current low voltage under the action of the alternating current-direct voltage reduction module 24, when the circuit board 1 leaks and outputs a leakage signal and is received by the detection module 25, the detection module 25 can output an abnormal voltage signal to the processing subunit 282, the chip module can output a driving signal under the action of the abnormal voltage signal and the working voltage signal, and the driving signal is transmitted to the driving unit 30 so that the driving unit 30 can output a power-off signal.

The implementation principle of the novel leakage protector in the embodiment of the application is as follows: when an electric appliance connected with the leakage protector needs to be used, the plug 3 is inserted into a socket, the coil 2 is electrified to generate a magnetic field, the extrusion block 10 is extruded to enable the suction needle 6 to approach towards the front shell 17, and in the process that the suction needle 6 moves towards the front shell 17, the suction needle can approach towards the coil 2 under the action of the guide surface 16, so that the coil 2 can attract the suction needle 6, at the moment, after the extrusion block 10 is loosened, the suction needle 6 can approach towards the rear shell 18 under the action of the spring 15, so that the suction needle 6 can drive the fixture block 11 to move to enable the conducting piece 5 to be connected with the contact piece 4, and at the moment, commercial electric energy is transmitted into the connected electric appliance through the conducting piece 5 to enable the electric appliance to be normally used; when the electric leakage condition appears, the voltage on the circuit board 1 changes, the output power-off signal changes the magnetic field of the coil 2 in the coil 2, at the moment, the suction needle 6 moves upwards under the action of the spring 15 to enable the suction needle 6 to be separated from the magnetic field range of the coil 2, the clamping effect of the fixture block 11 and the suction needle 6 disappears, the fixture block 11 recovers the original state to cause the separation of the conducting piece 5 and the contact piece 4, and therefore the connected electric appliance can be powered off, and the power-off protection effect is achieved on the electric appliance.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A novel leakage protector is characterized in that: including circuit board (1), set up coil (2) that are used for producing the magnetic field on circuit board (1) and be connected and be used for inserting plug (3) of socket with coil (2) electricity, be provided with contact piece (4) and the circular telegram piece (5) that are used for current output that are connected with plug (3) electricity on circuit board (1), be provided with the pressing component that is used for controlling circular telegram piece (5) to remove on circuit board (1), pressing component includes suction needle (6) that can be attracted by coil (2) magnetic field, suction needle (6) have first station and second station, when suction needle (6) are in first station, no action between coil (2) and suction needle (6), this moment contact piece (4) and circular telegram piece (5) phase separation, when suction needle (6) are in the second station, attract mutually between coil (2) and suction needle (6), at the moment, the contact piece (4) is abutted with the electrified piece (5); the circuit board (1) is provided with a control circuit for leakage protection, and when the circuit board (1) outputs a leakage signal, the control circuit outputs a power-off signal to the coil (2) so as to separate the contact piece (4) from the energizing piece (5).

2. A novel earth-leakage protector according to claim 1, characterized in that: the control circuit includes:

the alternating current and direct current voltage reduction module (24) is connected with the mains supply and used for receiving a normal voltage signal, and when the alternating current and direct current voltage reduction module (24) receives the normal voltage signal, a working voltage signal is output;

the detection module (25) is connected with the circuit board (1) and used for receiving the leakage signal, and outputting an abnormal voltage signal when the detection module (25) receives the leakage signal;

and the power-off module is connected with the output end of the AC-DC voltage reduction module (24) and the output end of the detection module (25) and used for receiving the working voltage signal and the abnormal voltage signal, and when the power-off module receives the working voltage signal and the abnormal voltage signal simultaneously, the power-off module outputs a power-off signal to the coil (2).

3. A novel earth-leakage protector according to claim 2, characterized in that: be provided with pilot lamp (7) on circuit board (1), control circuit still includes indicating module (26), indicating module (26) and mains connection for receive normal voltage signal, pilot lamp (7) and indicating module (26) are established ties, and when indicating module (26) received normal voltage signal, pilot lamp (7) light.

4. A novel earth-leakage protector according to claim 3, characterized in that: be provided with reset switch (8) on circuit board (1), control circuit still includes reset module (27), reset module (27) are connected with commercial power and detection module (25) respectively for receive normal voltage signal, reset switch (8) are established ties on reset module (27), reset switch (8) have connected state and off-state, receive normal voltage signal just when reset module (27) reset switch (8) are in connected state, in reset module (27) output analog signal to detection module (25), this moment detection module (25) output abnormal voltage signal, work as when reset switch (8) are in the off-state, reset module (27) do not operate.

5. A novel earth-leakage protector according to claim 2, characterized in that: the power-off module includes:

the enabling unit (28) is connected with the output end of the detection module (25) and used for receiving the abnormal voltage signal, and when the enabling unit (28) receives the abnormal voltage signal, the enabling unit outputs an enabling signal;

the chip unit (29) is connected with the output end of the enabling unit (28) and is used for receiving the enabling signal and outputting the driving signal when the chip unit (29) receives the enabling signal;

and the driving unit (30) is connected with the output end of the chip unit (29) and is used for receiving the driving signal, and when the driving unit (30) receives the driving signal, the power-off signal is output.

6. A novel earth-leakage protector according to claim 4, characterized in that: the pressing assembly further comprises a fixing shell (9) arranged on the circuit board (1), the fixing shell (9) is connected with an extrusion block (10) in a sliding mode, the suction needle (6) is arranged at one end, close to the coil (2), of the extrusion block (10) and penetrates through the fixing shell (9), a clamping block (11) which is penetrated through by the suction needle (6) is connected to the electrified piece (5), a bending portion (12) is arranged on the suction needle (6), and when the suction needle (6) is located at the second station, the bending portion (12) is connected with the clamping block (11) in a clamping mode.

7. A novel earth-leakage protector according to claim 1, characterized in that: the coil (2) is connected with a limiting rod (13) in a sliding mode, and a limiting hole (14) for inserting the suction needle (6) is formed in the side wall of the limiting rod (13).

8. A novel earth-leakage protector according to claim 6, characterized in that: a spring (15) is clamped between the extrusion block (10) and the fixed shell (9) along the moving direction of the extrusion block (10), the outer surface of the suction needle (6) is sleeved with the spring (15), a guide surface (16) which is inclined towards the extrusion block (10) is arranged on the bending part (12), and the guide surface (16) abuts against the fixture block (11).

9. A novel earth-leakage protector according to claim 6, characterized in that: still include preceding shell (17) and backshell (18), preceding shell (17) and backshell (18) enclose to close and form the storage chamber that power supply circuit board (1) was placed, and the screw passes preceding shell (17) and backshell (18) threaded connection, set up on backshell (18) and extrude piece (10), reset switch (8) and pilot lamp (7) one-to-one's through hole (19), be provided with flexible glue cover (20) on through hole (19), the surface of extruding piece (10) and reset switch (8) is located to flexible glue cover (20) cover.

10. A novel earth-leakage protector according to claim 9, characterized in that: the inside wall of preceding shell (17) is provided with a plurality of butt post (21), butt post (21) butt is provided with the surface of coil (2) on circuit board (1), the one end that is close to backshell (18) on butt post (21) is provided with reference column (22), set up constant head tank (23) that supply reference column (22) to peg graft one by one on circuit board (1).