CN102832592B - There is the leakage current detection protection circuit of anti-/ lightning impulse resistant function - Google Patents
There is the leakage current detection protection circuit of anti-/ lightning impulse resistant function Download PDFInfo
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- CN102832592B CN102832592B CN201110164747.7A CN201110164747A CN102832592B CN 102832592 B CN102832592 B CN 102832592B CN 201110164747 A CN201110164747 A CN 201110164747A CN 102832592 B CN102832592 B CN 102832592B
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Abstract
There is a leakage current detection protection circuit for anti-/ lightning impulse resistant function, it comprise installation on circuit boards for detect leakage current induction coil, for detecting the self-excitation coil of low resistance fault, control chip, controllable silicon, rectifier diode, resistance, filter capacitor, the tripping coil being built-in with iron core, at least one group of major loop switch link with reset button, and the simulation power switch that links of reset button; This simulation power switch is a single-pole double-throw switch (SPDT), it is characterized in that: this leakage current detection protection circuit also comprises at least one group of discharge metal sheets; Tip or the electric discharge cambered surface of the first discharge metal sheets and the second discharge metal sheets are disposed opposite to each other, and space, one section, interval; Wherein, Described first discharge metal sheets is connected with power input live wire or zero line, and the second discharge metal sheets is not only connected with power input zero line or live wire by described simulation power switch KR-2 but also is connected with power output end zero line or live wire.
Description
Technical field
The present invention relates to a kind of be arranged on there is creepage protection function attaching plug or supply socket or switch disconnector in there is leakage current detection protection circuit that is anti-, lightning impulse resistant function.
Background technology
Along with having the supply socket (being called for short GFCI) of creepage protection function, the development of attaching plug, mains switch industry; people to having the supply socket of creepage protection function, the function of attaching plug, safety in utilization require more and more higher, particularly exports to the supply socket of the U.S., attaching plug.
In order to prevent the bad weathers such as thunderstorm; the damage that thunder and lightning causes household electrical appliance; the present inventor is devoted for years in development earth leakage protective socket; to be arranged on there is creepage protection function attaching plug or supply socket or switch disconnector in leakage current detection protection circuit improve; rearrange the position of discharge metal sheets, the function of the leakage current detection protection circuit after improvement is really had anti-/ lightning impulse resistant.Make to be provided with the supply socket (being called for short GFCI) of this leakage current detection protection circuit, function that attaching plug, mains switch have lightning impulse resistant; to the household electrical appliance be connected with supply socket (being called for short GFCI), attaching plug, mains switch, as electric water tank, air-conditioning, water heating device etc. play long-term protective effect.
Summary of the invention
In view of the foregoing, main purpose of the present invention is to provide a kind of leakage current detection protection circuit with anti-/ lightning impulse resistant function.
For achieving the above object, the present invention is by the following technical solutions: a kind of leakage current detection protection circuit with anti-/ lightning impulse resistant function, it comprise installation on circuit boards for detect leakage current induction coil, for detecting the self-excitation coil of low resistance fault, control chip, controllable silicon, rectifier diode, resistance, filter capacitor, the tripping coil being built-in with iron core, at least one group of major loop switch link with reset button, and the simulation power switch that links of reset button; This simulation power switch is a single-pole double-throw switch (SPDT), it is characterized in that:
This leakage current detection protection circuit also comprises at least one group of discharge metal sheets; Tip or the electric discharge cambered surface of the first discharge metal sheets and the second discharge metal sheets are disposed opposite to each other, and space, one section, interval; Wherein,
Described first discharge metal sheets is connected with power input live wire or zero line, and the second discharge metal sheets is connected with power input zero line or live wire by described simulation power switch.
Described first discharge metal sheets is connected with power input live wire;
Described second discharge metal sheets is connected with the dynamic contact lever of described simulation power switch, first quiet contact jaw of simulation power switch is connected with the power input zero line of self-excitation coil with through induction coil, and the second quiet contact jaw of simulation power switch is connected with power input zero line.
In the specific embodiment of the invention, described second discharge metal sheets is connected with power input zero line;
Described first discharge metal sheets is connected with the dynamic contact lever of simulation power switch, first quiet contact jaw of simulation power switch is connected with the power input live wire of self-excitation coil with through induction coil, and the second quiet contact jaw of simulation power switch is connected with power input live wire.
In another specific embodiment of the present invention, described second discharge metal sheets is connected with power input zero line;
Described first discharge metal sheets is connected through the dynamic contact lever of tripping coil with simulation power switch, first quiet contact jaw of simulation power switch is connected with the power input live wire of self-excitation coil with through induction coil, and the second quiet contact jaw of simulation power switch is connected with power input live wire.
There is a leakage current detection protection circuit for anti-/ lightning impulse resistant function, it comprise installation on circuit boards for detect leakage current induction coil, for detecting the self-excitation coil of low resistance fault, control chip, controllable silicon, rectifier diode, resistance, filter capacitor, the tripping coil being built-in with iron core, at least one group of major loop switch link with reset button, and the simulation power switch (KR-2) that links of reset button; This simulation power switch is a single-pole double-throw switch (SPDT), it is characterized in that:
This leakage current detection protection circuit also comprises at least one group of discharge metal sheets; Tip or the electric discharge cambered surface of the first discharge metal sheets and the second discharge metal sheets are disposed opposite to each other, and space, one section, interval; Wherein,
Described first discharge metal sheets is connected with power input live wire or zero line, and the second discharge metal sheets is not only connected with power input zero line or live wire by described simulation power switch but also is connected with power output end zero line or live wire.
In a particular embodiment of the present invention, described first discharge metal sheets is connected with power input zero line;
Described second discharge metal sheets is connected with the dynamic contact lever of simulation power switch, and the first quiet contact jaw of simulation power switch is connected with power input live wire, and the second quiet contact jaw of simulation power switch is connected with power output end live wire.
In a particular embodiment of the present invention, described first discharge metal sheets is connected with power input zero line;
Described second discharge metal sheets is connected through the dynamic contact lever of tripping coil with simulation power switch, and the first quiet contact jaw of simulation power switch is connected with power input live wire, and the second quiet contact jaw of simulation power switch is connected with power output end live wire.
In a particular embodiment of the present invention, described first discharge metal sheets is connected with power input live wire;
Described second discharge metal sheets is connected with the dynamic contact lever of simulation power switch, and the first quiet contact jaw of simulation power switch is connected with power input zero line, and the second quiet contact jaw of simulation power switch is connected with power output end zero line.
Accompanying drawing explanation
Fig. 1-1 is leakage current detection protection circuit embodiment 1 physical circuit figure of the present invention;
Fig. 1-2 is leakage current detection protection circuit embodiment 2 physical circuit figure of the present invention;
Fig. 2-1 is leakage current detection protection circuit embodiment 3 physical circuit figure of the present invention;
Fig. 2-2 is leakage current detection protection circuit embodiment 4 physical circuit figure of the present invention;
Fig. 3-1 is leakage current detection protection circuit embodiment 5 physical circuit figure of the present invention;
Fig. 3-2 is leakage current detection protection circuit embodiment 6 physical circuit figure of the present invention;
Fig. 4 is leakage current detection protection circuit embodiment 7 physical circuit figure of the present invention;
Fig. 5-1 is leakage current detection protection circuit embodiment 8 physical circuit figure of the present invention;
Fig. 5-2 is leakage current detection protection circuit embodiment 9 physical circuit figure of the present invention;
Fig. 6 is leakage current detection protection circuit embodiment 10 physical circuit figure of the present invention.
Embodiment
As Figure 1-1, the leakage current detection protection circuit with anti-/ lightning impulse resistant function disclosed by the invention primarily of install on circuit boards for detect leakage current induction coil L1, for detect the self-excitation coil L2 of low resistance fault, control chip IC1 (model RV4145), controllable silicon V4, rectifier diode V1, current-limiting resistance R1, filter capacitor C3, the tripping coil SOL being built-in with iron core, at least one pair of major loop K switch R2-1, the KR2-2 that links with reset button, and the Test Switchboard KR-5 that links of testing button form.
The live wire HOT of power input LINE through the induction coil L1 for detecting leakage current, export sleeve for major loop K switch R2-1 through linking with reset button of the self-excitation coil L2 that detects low resistance fault with the live wire of power supply output plughole and power output end live wire is connected or disconnects, power supply is provided.
The zero line WHITE of power input LINE through the induction coil L1 for detecting leakage current, export sleeve for major loop K switch R2-2 through linking with reset button of the self-excitation coil L2 that detects low resistance fault with the zero line of power supply output plughole and power output end zero line is connected or disconnects, power supply is provided.
The live wire output sleeve of power output end LOAD live wire and power supply output plughole becomes an entirety and is connected; The zero line output sleeve of power output end LOAD zero line and power supply output plughole becomes an entirety and is connected.
Be connected with the detection signal input pin 1,2,3,7 of control chip IC1 with the signal output part of the self-excitation coil L2 for detecting low resistance fault for detecting the induction coil L1 of leakage current, the control signal output pin 5 of control chip IC1 is extremely connected with the control of controllable silicon V4, exports conducting and shutoff that triggering signal controls controllable silicon V4.Meanwhile, the control pole of controllable silicon V4 is also connected with the control signal output OUT of timer chip DSQ, and timing sends triggering signal, makes controllable silicon V4 conducting, thus whether detection leakage current detection protection circuit can normally work.
As Figure 1-1, the present invention also comprises the simulation power switch KR-2 that at least one and reset button link.When reset button RESET is in trip status, this simulation power switch KR-2 is in off-state, and whole leakage current detection protection circuit is not charged, has not only saved electric energy, but also extends the life-span of electrical equipment original paper.When reset button RESET is pressed; simulation power switch KR-2 closes; be not only leakage current detection protection circuit and working power is provided; can also automatically produce simulation leakage current; whether automatic detection leakage current detection protection circuit can normally work, and namely automatically detects leakage current detection protection circuit whether end-of-life.After reset button resets, simulation power switch KR-2 switches to another state, and simulation leakage current disappears; But simulation power switch KR-2 is still in closure state, for whole simulation leakage current test protective circuit provides working power.
Have dual-use function because the present invention simulates power switch KR-2, the simulation leakage current that switch instead of in existing leakage current detection protection circuit produces switch and power switch two switches, thus; make circuit more succinct; volume reduces greatly, reduces cost, enhances the market competitiveness.
As Figure 1-1, this simulation power switch KR-2 is a single-pole double-throw switch (SPDT), and its second quiet contact jaw B is connected with power input LINE zero line WHITE; Its first quiet contact jaw A with through being connected with the zero-power line WHIE of the self-excitation coil L2 for detecting low resistance fault for the induction coil L1 detecting leakage current; Its dynamic contact lever C is connected with the place of working input pin 4 of control chip IC1, the negative electrode of controllable silicon V4.
When reset button RESET is in trip status; simulation power switch KR-2 is in off-state; the components and parts such as the control chip IC1 in leakage current detection protection circuit, controllable silicon V4, tripping coil SOL, resistance, electric capacity are all not charged; whole leakage current detection protection circuit is not charged, is in electricity-saving state.This design makes the present invention more meet the designing requirement of energy-conserving and environment-protective; power saving; and; due to when leakage current detection protection circuit does not work; the components and parts such as the control chip IC1 in circuit, controllable silicon V4, tripping coil SOL, resistance, electric capacity are all not charged; so, make components and parts more anti-aging, thus extend the useful life of components and parts and whole circuit.
When reset button RESET is pressed, simulation power switch KR-2 and reset button RESET links, the first quiet contact jaw A of simulation power switch KR-2 contacts with dynamic contact lever C, simulation power switch KR-2 closes, power input LINE live wire HOT is through tripping coil SOL, LED1, resistance R5, diode V2, closed simulation power switch KR-2 is connected with the power input zero line WHITE of self-excitation coil L2 with through induction coil L1, for control chip IC1, controllable silicon V4, rectifier diode V1, resistance R1, filter capacitor C3, the tripping coil SOL being built-in with iron core provides working power path, form closed-loop path, produce simulation leakage current.
If leakage current detection protection circuit does not have end-of-life; still there is creepage protection function; because producing simulation leakage current in power supply circuits, then induction coil L1, self-excitation coil L2 export induced signal to control chip IC1, and 5 pin of control chip IC1 export control signal; make controllable silicon V4 conducting; there is electric current to flow through in tripping coil, produce magnetic field in tripping coil, be arranged on the iron core action in tripping coil; snap close in earth leakage protective socket is opened, waits for that reset button resets.
Unclamp reset button, reset button RESET resets, and major loop K switch R2-1, KR2-2 are closed, and leakage current detection protection circuit power output end LOAD and power supply output plughole have power supply to export.Simultaneously, dynamic contact lever C and the first quiet contact jaw A of simulation power switch KR-2 disconnect, and simulation leakage current disappears, and dynamic contact lever C contacts with the second quiet contact jaw B, simulation power switch KR-2 is switched to another state, and simulation power switch KR-2 is still in closure state.Power input LINE live wire HOT is connected with power input zero line WHITE through tripping coil SOL, controllable silicon V4, closed simulation power switch KR-2; for control chip IC1, controllable silicon V4, rectifier diode V1, resistance R1, filter capacitor C3, the tripping coil SOL that is built-in with iron core provide working power, leakage current detection protection circuit live line work.
In order to prevent thunder and lightning to the damage of leakage current detection protection circuit; and the damage of the household electrical appliance to be connected with this leakage current detection protection circuit; as shown in Fig. 1-1, Fig. 2-1, Fig. 3-1, Fig. 4-1, Fig. 5-1, Fig. 6-1, the present invention also comprises at least one group of discharge metal sheets M1, M2.Tip or the electric discharge cambered surface of discharge metal sheets M1, M2 are disposed opposite to each other, and one section, interval space 0.7mm-1.5mm.Wherein a slice discharge metal sheets M1 exports sleeve with the live wire of power supply output plughole and is connected, and another sheet discharge metal sheets M2 exports sleeve with the zero line of power supply output plughole and is connected.
Discharge metal sheets M1, M2 are the pair of electrodes utilizing point discharge effect to design, it be mounted respectively be connected to power input or power output end live wire and zero line on, and must be arranged on need protection circuit in.When lightning induction to live wire, zero line instantaneous, can between live wire, zero line, produce low then several thousand volts, the high then voltage of tens thousand of volts, this instantaneous high voltage pulse can produce very large destruction to the load of electronic circuit.Therefore, this leakage current detection protection circuit can damage, and the household electrical appliance be correspondingly connected with the earth leakage protective socket being provided with this leakage current detection protection circuit also can be hit damage.Therefore, above-mentioned discharge metal sheets M1, M2 are just equivalent to the lightning arrester that is contained in earth leakage protective socket.
In order to prevent thunder and lightning to the damage of leakage current detection protection circuit, in the specific embodiment of the invention, described at least one group of discharge metal sheets comprising can also be placed on power input.As discharge metal sheets M3, M4 in Fig. 1-2.Tip or the electric discharge cambered surface of discharge metal sheets M3, M4 are disposed opposite to each other, and one section, interval space 0.7mm-1.5mm.Wherein a slice discharge metal sheets M3 is connected with power input zero line, and discharge metal sheets M4 is connected with power input live wire through tripping coil SOL.Or as shown in Fig. 5-2, discharge metal sheets M3 is connected with power input zero line, discharge metal sheets M4 is connected with the power input live wire of self-excitation coil L2 with through induction coil L1 through tripping coil SOL.Or as shown in Fig. 1-1, Fig. 2-1, Fig. 3-1, Fig. 5-1, wherein, a slice electric discharge sheet sheet metal M9 is connected with power input live wire or zero line, another sheet discharge metal sheets M10 with through induction coil L1 and self-excitation coil L2 zero-power line or live wire is connected.
In order to prevent thunder and lightning to the damage of leakage current detection protection circuit; in another group specific embodiment of the present invention; the described at least one group of discharge metal sheets comprised can also be placed on other position, is connected with power input live wire or zero line by simulation power switch KR-2.As discharge metal sheets M5, M6 in Fig. 1-1.Tip or the electric discharge cambered surface of discharge metal sheets M5, M6 are disposed opposite to each other, and one section, interval space 0.7mm-1.5mm.Wherein a slice discharge metal sheets M5 is connected with power input live wire, and another sheet discharge metal sheets M6 is through closed being connected with power input zero line of simulation power switch KR-2.As Figure 1-1, discharge metal sheets M6 is connected with the dynamic contact lever C of simulation power switch KR-2, the first quiet contact jaw A of simulation power switch KR-2 is connected with the power input zero line of self-excitation coil L2 with through induction coil L1, and the second quiet contact jaw B of simulation power switch KR-2 is connected with power input zero line.
The connected mode of discharge metal sheets M7, M8 in Fig. 2-1 is substantially identical with the connected mode of discharge metal sheets M5, M6 in Fig. 1-1.Its difference is: the discharge metal sheets M7 in Fig. 2-1 is connected with power input zero line, and discharge metal sheets M8 is through closed being connected with power input live wire of simulation power switch KR-2.Specifically, discharge metal sheets M8 is connected with the dynamic contact lever C of simulation power switch KR-2, the first quiet contact jaw A of simulation power switch KR-2 is connected with the power input live wire of self-excitation coil L2 with through induction coil L1, and the second quiet contact jaw B of simulation power switch KR-2 is connected with power input live wire.
The connected mode of discharge metal sheets M3, M4 in Fig. 2-2 is substantially identical with the connected mode of discharge metal sheets M7, M8 in Fig. 2-1.Its difference is: the discharge metal sheets M3 in Fig. 2-2 is connected with power input zero line, and discharge metal sheets M4 is through closed being connected with power input live wire of tripping coil SOL, simulation power switch KR-2.Specifically, discharge metal sheets M4 is connected with the dynamic contact lever C of simulation power switch KR-2 through tripping coil SOL, the first quiet contact jaw A of simulation power switch KR-2 is connected with the power input live wire of self-excitation coil L2 with through induction coil L1, and the second quiet contact jaw B of simulation power switch KR-2 is connected with power input live wire.
In order to prevent thunder and lightning to the damage of leakage current detection protection circuit; in another group of specific embodiment of the present invention; the described at least one group of discharge metal sheets comprised can also be placed on other position; one of them discharge metal sheets is connected with power input live wire or zero line, and another discharge metal sheets is not only connected with power input zero line or live wire by simulation power switch KR-2 but also is connected with power output end zero line or live wire.
As discharge metal sheets M7, M8 in Fig. 3-1, Fig. 4-1.Tip or the electric discharge cambered surface of discharge metal sheets M7, M8 are disposed opposite to each other, and one section, interval space 0.7mm-1.5mm.Wherein a slice discharge metal sheets M7 is connected with power input zero line, and discharge metal sheets M8 is not only connected with power input live wire through simulation power switch KR-2 but also is connected with power output end live wire.As shown in Fig. 3-1, Fig. 4-1, discharge metal sheets M8 is connected with the dynamic contact lever C of simulation power switch KR-2, the first quiet contact jaw A of simulation power switch KR-2 is connected with power input live wire, and the second quiet contact jaw B of simulation power switch KR-2 is connected with power output end live wire.
When reset button RESET is in trip status, simulation power switch KR-2 is in off-state.When reset button RESET is pressed, the dynamic contact lever C of simulation power switch KR-2 contacts with the first quiet contact jaw A, and simulation power switch KR-2 closes, and discharge metal sheets M8 is connected with power input live wire through closed simulation power switch KR-2; After reset button RESET resets, the dynamic contact lever C of simulation power switch KR-2 contacts with the second quiet contact jaw B, and simulation power switch KR-2 closes, and discharge metal sheets M8 is connected with power output end live wire through closed simulation power switch KR-2.If be now struck by lightning, discharge metal sheets M7, M8 are while electric discharge, and when the voltage between two discharge metal sheets exceedes set point, two discharge metal sheets are breakdown, produce leakage current, make leakage current detection protection circuit action, and reset button RESET trips.
In specific embodiment shown in Fig. 3-2, the connected mode of discharge metal sheets M3, M4 is substantially identical with the connected mode of discharge metal sheets M7, M8 in Fig. 3-1.Its difference is: the discharge metal sheets M3 in Fig. 3-2 is connected with power input zero line, and discharge metal sheets M4 is not only connected with power input live wire through tripping coil SOL, simulation power switch KR-2 but also is connected with power output end live wire.Specifically, discharge metal sheets M4 is connected with the dynamic contact lever C of simulation power switch KR-2 through tripping coil SOL, the first quiet contact jaw A of simulation power switch KR-2 is connected with power input live wire, and the second quiet contact jaw B of simulation power switch KR-2 is connected with power output end live wire.
In specific embodiment shown in Fig. 5-1, Fig. 6-1, the connected mode of discharge metal sheets M5, M6 is substantially identical with the connected mode of discharge metal sheets M7, M8 in Fig. 3-1.Its difference is: Fig. 5-1 is connected with power input live wire with the discharge metal sheets M5 in Fig. 6-1, and discharge metal sheets M6 is not only connected with power input zero line through simulation power switch KR-2 but also is connected with power output end zero line.As shown in Fig. 5-1, Fig. 6-1, discharge metal sheets M6 is connected with the dynamic contact lever C of simulation power switch KR-2, the first quiet contact jaw A of simulation power switch KR-2 is connected with power input zero line, and the second quiet contact jaw B of simulation power switch KR-2 is connected with power output end zero line.
When reset button RESET is in trip status, simulation power switch KR-2 is in off-state.When reset button RESET is pressed, the dynamic contact lever C of simulation power switch KR-2 contacts with the first quiet contact jaw A, and simulation power switch KR-2 closes, and discharge metal sheets M6 is connected with power input zero line through closed simulation power switch KR-2; After reset button RESET resets, the dynamic contact lever C of simulation power switch KR-2 contacts with the second quiet contact jaw B, and simulation power switch KR-2 closes, and discharge metal sheets M8 is connected with power output end zero line through closed simulation power switch KR-2.If be now struck by lightning, discharge metal sheets M5, M6 are while electric discharge, and when the voltage between two discharge metal sheets exceedes set point, two discharge metal sheets are breakdown, produce leakage current, make leakage current detection protection circuit action, and reset button RESET trips.
In order to react the operating state of leakage current detection protection circuit in time, as shown in Fig. 1-2, Fig. 2-2, the present invention also comprises display circuit.This display circuit is made up of power supply output indicator LED2, diode V6 and current-limiting resistance R6.After power supply output indicator LED2, diode V6 and current-limiting resistance R6 series connection, one end is connected with power output end live wire, and the other end is connected with power output end zero line.When leakage current detection protection circuit power output end has power supply to export, LED2 is bright for power supply output indicator, otherwise, do not work.
In addition, this display circuit also has wiring error Presentation Function.When the power line in wall is connected with leakage current detection protection circuit power output end LOAD by installment work mistakenly; because reset button RESET is in trip status; LED2 is bright for this power supply output indicator, automatically stops reset, shows this leakage current detection protection circuit wiring error.Otherwise when installer's wiring is correct, even if reset button RESET is in trip status, this power supply output indicator LED2 does not work yet.
Leakage current detection protection circuit shown in Fig. 5-1, Fig. 5-2 comprises a wiring error display circuit.This wiring error display circuit is made up of normally closed switch KR-3, indicator light LED2, diode V6 and the current-limiting resistance R6 linked with reset button.After the normally closed switch KR-3 linked with reset button, indicator light LED2, diode V6 and current-limiting resistance R6 connect, one end is connected with power output end live wire, and the other end is connected with power output end zero line.When reset button RESET is in trip status, K switch R-3 closes, and when reset button RESET is in reset mode, K switch R-3 disconnects.
When the power line in wall is connected with leakage current detection protection circuit power output end LOAD by installment work mistakenly; because reset button RESET is in trip status, so K switch R-3 is in closure state; indicator light LED2 is bright, shows this leakage current detection protection circuit wiring error.Otherwise when installer's wiring is correct, even if reset button RESET is in trip status, K switch R-3 is in closure state, because leakage current detection protection circuit power output end is not charged, so indicator light LED2 does not work.
As Figure 1-1, the present invention also comprises an analog operation indicator light circuit.This analog operation indicator light circuit is made up of indicator light LED1, diode V2 and artifical resistance R5.After indicator light LED1, diode V2 and artifical resistance R5 series connection, one end is connected with power firestreak through tripping coil SOL, and the other end is connected with zero-power line through simulation power switch KR-2.
Analog operation indicator light circuit of the present invention has dual-use function: 1, when reset button is pressed, if leakage current detection protection circuit does not have end-of-life, this analog operation indicator light circuit produces simulation leakage current, indicator light LED1 is once glittering, if leakage current detection protection circuit end-of-life, then reset button is stoped to reset; Whether 2, simultaneously, this analog operation indicator light circuit has again instruction, Presentation Function, show leakage current detection protection circuit whether end-of-life, can normally work; So two kinds of functions unite two into one by analog operation indicator light circuit of the present invention, and circuit is more succinct.
Advantage of the present invention is: the diverse location in leakage current detection protection circuit arranges at least one pair of discharge metal sheets, effectively can resist lightning impulse, plays a protective role to leakage current detection protection circuit and the household electrical appliance that are connected with this leakage current detection protection circuit.
The above know-why being specific embodiments of the invention and using, any based on the equivalent transformation on technical solution of the present invention basis, all belong within scope.
Claims (4)
1. one kind has the leakage current detection protection circuit of anti-/ lightning impulse resistant function, it comprises the installation induction coil (L1) for detecting leakage current on circuit boards, for detecting the self-excitation coil (L2) of low resistance fault, control chip (IC1), controllable silicon (V4), rectifier diode (V1), resistance (R1), filter capacitor (C3), be built-in with the tripping coil (SOL) of iron core, at least one group of major loop switch (KR2-1 linked with reset button, KR2-2), the simulation power switch (KR-2) linked with reset button, this simulation power switch (KR-2) is a single-pole double-throw switch (SPDT), it is characterized in that:
This leakage current detection protection circuit also comprises at least one group of discharge metal sheets; Tip or the electric discharge cambered surface of the first discharge metal sheets and the second discharge metal sheets are disposed opposite to each other, and space, one section, interval; Wherein,
Described first discharge metal sheets is connected with power input live wire or zero line;
Described second discharge metal sheets is connected with the dynamic contact lever of described simulation power switch, first quiet contact jaw of simulation power switch is connected with through the power input zero line of described induction coil and self-excitation coil or live wire, and the second quiet contact jaw of simulation power switch is connected with power input zero line or live wire.
2. a kind of leakage current detection protection circuit with anti-/ lightning impulse resistant function according to claim 1, is characterized in that:
Described second discharge metal sheets is connected through the dynamic contact lever of described tripping coil with described simulation power switch.
3. one kind has the leakage current detection protection circuit of anti-/ lightning impulse resistant function, it comprises the installation induction coil (L1) for detecting leakage current on circuit boards, for detecting the self-excitation coil (L2) of low resistance fault, control chip (IC1), controllable silicon (V4), rectifier diode (V1), resistance (R1), filter capacitor (C3), be built-in with the tripping coil (SOL) of iron core, at least one group of major loop switch (KR2-1 linked with reset button, KR2-2), the simulation power switch (KR-2) linked with reset button, this simulation power switch (KR-2) is a single-pole double-throw switch (SPDT), it is characterized in that:
This leakage current detection protection circuit also comprises at least one group of discharge metal sheets; Tip or the electric discharge cambered surface of the first discharge metal sheets and the second discharge metal sheets are disposed opposite to each other, and space, one section, interval; Wherein,
Described first discharge metal sheets is connected with power input live wire or zero line;
Described second discharge metal sheets is connected with the dynamic contact lever of described simulation power switch, and the first quiet contact jaw of simulation power switch is connected with power input zero line or live wire, and the second quiet contact jaw of simulation power switch is connected with power output end zero line or live wire.
4. a kind of leakage current detection protection circuit with anti-/ lightning impulse resistant function according to claim 3, is characterized in that:
Described second discharge metal sheets is connected through the dynamic contact lever of described tripping coil with described simulation power switch.
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| CN101895088A (en) * | 2009-05-20 | 2010-11-24 | 黄华道 | Leakage detection protection circuit |
| CN201774226U (en) * | 2010-03-29 | 2011-03-23 | 黄华道 | Novel electricity-saving leakage detection protecting circuit |
| CN201774098U (en) * | 2010-04-22 | 2011-03-23 | 黄华道 | Novel earth leakage protection socket |
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2011
- 2011-06-17 CN CN201110164747.7A patent/CN102832592B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4618907A (en) * | 1985-01-29 | 1986-10-21 | Eagle Electric Mfg. Co., Inc. | Desensitized ground fault interrupter |
| CN101895088A (en) * | 2009-05-20 | 2010-11-24 | 黄华道 | Leakage detection protection circuit |
| CN201774226U (en) * | 2010-03-29 | 2011-03-23 | 黄华道 | Novel electricity-saving leakage detection protecting circuit |
| CN201774098U (en) * | 2010-04-22 | 2011-03-23 | 黄华道 | Novel earth leakage protection socket |
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| CN102832592A (en) | 2012-12-19 |
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