CN201422011Y - Leakage-detecting protective circuit - Google Patents
Leakage-detecting protective circuit Download PDFInfo
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- CN201422011Y CN201422011Y CN2009200037513U CN200920003751U CN201422011Y CN 201422011 Y CN201422011 Y CN 201422011Y CN 2009200037513 U CN2009200037513 U CN 2009200037513U CN 200920003751 U CN200920003751 U CN 200920003751U CN 201422011 Y CN201422011 Y CN 201422011Y
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Abstract
The utility model discloses a leakage-detecting protective circuit, comprising a differentiating transformer coil for leakage detection, four power connection switches linked with a reset button, a control chip for leakage detection, a piece of controlled silicon, a full wave rectifying circuit, a tripping coil with a built-in iron core, a trigger silicon-controlled switch linked with the reset button, a start-up and tripping switch and a life-end sense switch. Via the tripping coil, a live wire or a zero curve of a power supply is connected to the life-end sense switch of the reset button, asimulating leakage current limiting resistor and a zero curve or a live wire of the power supply which passes through the differentiating transformer coil, to generate a simulating leakage current. The anode of an output end for direct current supply of the full wave rectifying circuit is connected to the anode of the controlled silicon by the start-up and tripping switch. A signal input pin of the control chip for leakage detection is connected to a signal output end of the differentiating transformer coil. A signal output pin of the control chip for leakage detection is connected to a trigger pole of the controlled silicon.
Description
Technical field
The utility model relates to a kind of be applied to the have supply socket of creepage protection function, the leakage current detection protection circuit with detection of electrical leakage, defencive function in the attaching plug.Specifically; the disclosed leakage current detection protection circuit of the utility model not only has detection of electrical leakage, defencive function; can also whether whether end-of-life promptly still have creepage protection function detects to attaching plug, supply socket, and to because the instantaneous pressure that thunderbolt or other reasons cause has protective effect to the destruction that supply socket, attaching plug cause.
Background technology
Along with the continuous development of the supply socket with creepage protection function, attaching plug industry, people require more and more higher to the supply socket with creepage protection function, the safety in utilization of attaching plug.Hope is in earth leakage protective socket/plug use, and whether whether end-of-life promptly still has creepage protection function can to detect it; When its inner components and parts lost efficacy the forfeiture creepage protection function when its end-of-life, can in time remind the user, change new product.
Yet its inner leakage current detection protection circuit of the common in the market supply socket/attaching plug with creepage protection function does not only have life end checking function; and; when its end-of-life, concerning the user without any prompt facility, mislead the user and continue to use.When leaky occurring,, very easily cause the get an electric shock generation of dead accident of user because this earth leakage protective socket do not have any protective effect.
Summary of the invention
In view of the foregoing, main purpose of the present utility model provides a kind of interior leakage current detection protection circuit with detection of electrical leakage, defencive function of supply socket/attaching plug that is applied to have creepage protection function.
Another purpose of the present utility model provides a kind of leakage current detection protection circuit whether regular detection attaching plug, supply socket have creepage protection function that has.
Another purpose of the present utility model provides a kind of leakage current detection protection circuit with anti lightning invasion and attack and electrophoresis functions.
For achieving the above object, the utility model is by the following technical solutions: the tripping coil that a kind of leakage current detection protection circuit, this leakage current detection protection circuit comprise the differential differentiating transformer coil that is used to detect leakage current, are connected switch with four electric power of reset button interlock, leakage current detects control chip, controllable silicon, full-wave rectifying circuit, built-in iron core, triggering reverse-blocking tetrode thyristor, startup and the dropout switch, the life-span stop detection switch that link with reset button;
Power input live wire, zero line pass and are connected switch by four electric power with the reset button interlock behind the described differential differentiating transformer coil and link to each other with live wire, the zero line of live wire, zero line and the power supply output plughole of power output end, and formation electric power is exported main circuit;
The live wire of power input or zero line are by described tripping coil, link to each other with zero-power line that passes differential differentiating transformer coil or live wire with life-span stop detection switch, the simulation leakage current current-limiting resistance of reset button interlock;
The ac power input end of described full-wave rectifying circuit links to each other with the live wire of power input, zero line, the dc power output end positive pole of full-wave rectifying circuit links to each other with the power supply input pin that described leakage current detects control chip by resistance, simultaneously, the dc power output end of full-wave rectifying circuit is anodal links to each other with the silicon controlled anode with the dropout switch by described startup; The ground pin that leakage current detects control chip links to each other with the dc power output end negative pole of full-wave rectifying circuit with the silicon controlled negative electrode;
The signal input tube pin that leakage current detects control chip links to each other with the signal output part of differential differentiating transformer coil respectively, and the control signal output pin that leakage current detects control chip links to each other with the silicon controlled trigger electrode.
In specific embodiment of the utility model, an end of described triggering reverse-blocking tetrode thyristor links to each other with the dc power output end of described full-wave rectifying circuit is anodal, and the other end links to each other with the silicon controlled trigger electrode by resistance.
One end of described triggering reverse-blocking tetrode thyristor can also link to each other with the dc power output end of described full-wave rectifying circuit is anodal, and the other end links to each other with the silicon controlled anode.
One end of described triggering reverse-blocking tetrode thyristor can also link to each other with the dc power output end of described full-wave rectifying circuit is anodal; The other end links to each other with anode with the silicon controlled trigger electrode.
Also include timer chip in this leakage current detection protection circuit, the control signal output pin of this timer chip links to each other with the silicon controlled trigger electrode; Timer chip is regularly exported triggering signal, triggers the controllable silicon conducting.
The utility model circuit is succinct, stable performance, and is safe and reliable; Not only have detection of electrical leakage, defencive function; and; after the power input of attaching plug/supply socket and the power line in the wall connect, can produce the simulation leakage current automatically, whether supply socket/attaching plug still be had creepage protection function detect.The utility model also has anti lightning invasion and attack and electrophoresis functions.
Description of drawings
Fig. 1-1 is the disclosed leakage current detection protection circuit embodiment 1 physical circuit figure of the utility model;
Fig. 1-2 is the disclosed leakage current detection protection circuit embodiment 2 physical circuit figure of the utility model;
Fig. 2-1 is the disclosed leakage current detection protection circuit embodiment 3 physical circuit figure of the utility model;
Fig. 2-2 is the disclosed leakage current detection protection circuit embodiment 4 physical circuit figure of the utility model;
Fig. 3 is the disclosed leakage current detection protection circuit embodiment 5 physical circuit figure of the utility model;
Fig. 4-1, Fig. 4-2 are for being equipped with the mechanical device that resets/trip in the earth leakage protective socket of the present utility model mechanical device structure schematic diagram that resets/trip;
Fig. 5-1～Fig. 5-3 is for being installed in discharge metal sheet position, the structural representation of the utility model power input.
Embodiment
Fig. 1-1 is applied to have the interior leakage current detection protection circuit of supply socket/attaching plug of current leakage detection protection function for the utility model is disclosed.
As Figure 1-1, the tripping coil L3 that this leakage current detection protection circuit comprises the differential differentiating transformer coil L1, the L2 that are used to detect leakage current, is connected K switch R-2-1, KR-2-2 with four electric power of reset button interlock, KR-3-1, KR-3-2, leakage current detect control chip IC, controllable silicon V4, full-wave rectifying circuit V1～V4, built-in iron core, triggering reverse-blocking tetrode thyristor KR-4, startup and the dropout K switch R-2, the life-span stop detection K switch R-1 that link with reset button RESET.
Power input LINE live wire HOT, zero line WHITE pass behind differential differentiating transformer coil L1, the L2 by four electric power with the reset button interlock is connected K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 link to each other with live wire HOT, the zero line WHITE of power output end LOAD and live wire HOT, the zero line WHITE of power supply output plughole, formation electric power is exported main circuit.
The tripping coil L3 of the live wire HOT of power input LINE by built-in iron core, link to each other with the zero-power line that passes differential differentiating transformer coil L1, L2 with life-span stop detection K switch R-1, the simulation leakage current current-limiting resistance R4 of reset button RESET interlock.In the utility model embodiment 1, as Figure 1-1, after power firestreak, zero line in power input live wire, zero line and the wall that supply socket/attaching plug of the present utility model is installed connect, when not operating any parts, life-span stop detection K switch R-1 is a closure state, the live wire of power input links to each other with the zero-power line that passes differential differentiating transformer coil L1, L2 through tripping coil L3, closed life-span stop detection K switch R-1, simulation leakage current current-limiting resistance R4, form the loop, produce the simulation leakage current.
The ac power input end of full-wave rectifying circuit V1～V4 links to each other with live wire HOT, the zero line WHITE of power input, the dc power output end of full-wave rectifying circuit V1～V4 is anodal to link to each other with the power supply input pin 6 that leakage current detects control chip IC by resistance R 1, simultaneously, the dc power output end of full-wave rectifying circuit V1～V4 is anodal links to each other with the anode of controllable silicon V4 with dropout K switch R-2 by starting; The dc power output end positive pole of full-wave rectifying circuit V1～V4 also links to each other with the trigger electrode of controllable silicon V4 by triggering reverse-blocking tetrode thyristor KR-4, resistance R 8.Leakage current detects the ground pin 4 of control chip IC and the negative electrode of controllable silicon V4 links to each other with the dc power output end negative pole of full-wave rectifying circuit V1～V4.
The signal input tube pin 1,3,7 that leakage current detects control chip IC links to each other with the signal output part of differential differentiating transformer coil L1, L2 respectively, and the control signal output pin 5 that leakage current detects control chip IC links to each other with the trigger electrode of controllable silicon V4.
After the power firestreak in power input that earth leakage protective socket/plug of the present utility model is installed and the wall, zero line connect; when not pushing reset button RESET; life-span stop detection K switch R-1 is a closure state, and triggering reverse-blocking tetrode thyristor KR-4 and startup and dropout K switch R-2 is off-state.At this moment, because life-span stop detection K switch R-1 is a closure state, the live wire of power input links to each other with the zero-power line that passes differential differentiating transformer coil L1, L2 through tripping coil L3, closed life-span stop detection K switch R-1, simulation leakage current current-limiting resistance R4, form the loop, produce the simulation leakage current.Leakage current detects the control signal output pin 5 output high level signals of control chip IC, triggers controllable silicon V4.
When pressing reset button RESET, life-span stop detection K switch R-1 still is a closure state, triggering reverse-blocking tetrode thyristor KR-4 and dropout K switch R-2 closure with reset button RESET interlock, controllable silicon V4 conducting, there is enough big exciting current to flow through in the tripping coil L3 of built-in iron core and produces magnetic field, make the mechanical device action that resets/trip shown in Fig. 4-1, Fig. 4-2, reset button RESET can reset.
After discharging reset button RESET, reset button RESET is reset mode, four electric power that link with reset button are connected K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 are closure state, and the load output LOAD of attaching plug/supply socket and power supply output plughole all have power supply output; Simultaneously, with the life-span stop detection K switch R-1 and the triggering reverse-blocking tetrode thyristor KR-4 disconnection of reset button interlock, the simulation leakage current disappears, simulation leakage current EOT, the triggering signal disappearance of controllable silicon V4.Simultaneously, being lockable with dropout K switch R-2 with the startup of reset button interlock still is closure state.
Be built-in with earth leakage protective socket of the present utility model (GFCI)/plug and finish and reset, the utility model leakage current detection protection circuit enters whether safety utilization of electric power state of protection output loading.In being built-in with earth leakage protective socket of the present utility model/plug course of work; if electric leakage; during faults such as short circuit; differential differentiating transformer coil L1; L2 outputs signal to the pin one that leakage current detects control chip IC; 3; 7; the control signal output pin 5 output high level signals of chip IC trigger controllable silicon V4; because being lockable with dropout K switch R-2, startup is closure state; so controllable silicon V4 conducting; there is exciting current to flow through in the tripping coil L3 and produces magnetic field; make Fig. 4-1; resetting shown in Fig. 4-2/mechanical device work of tripping; reset button RESET tripping operation; thread off; four electric power in the electric power output main circuit connect K switch R-2-1; KR-2-2; KR-3-1; KR-3-2 disconnects, and cuts off the power supply output of earth leakage protective socket/plug.Life-span stop detection K switch R-1 returns to initial closure state from off-state, starts with dropout K switch R-2 to return to initial off-state from closure state.
For in earth leakage protective socket/plug course of normal operation; artificial its power supply that cuts off is exported; and manually detect supply socket/attaching plug and whether still have the current leakage detection protection function; end-of-life whether; the utility model has also comprised a manual test button TEST; the end of this manual test button TEST links to each other with the live wire HOT of load output LOAD, and the other end links to each other with zero-power line WHITE by resistance R 3.Manually push testing button TEST; make power output end live wire and zero-power line short circuit; produce the simulation leakage current; differential differentiating transformer coil L1; L2 outputs signal to the pin one that leakage current detects control chip IC; 3; 7; the control signal output pin 5 output high level signals of chip IC trigger controllable silicon V4; because being lockable with dropout K switch R-2, startup is closure state; so controllable silicon V4 conducting; there is exciting current to flow through in the tripping coil L3 and produces magnetic field; make Fig. 4-1; resetting shown in Fig. 4-2/mechanical device work of tripping; reset button RESET tripping operation; thread off; four electric power in the electric power output main circuit connect K switch R-2-1; KR-2-2; KR-3-1; KR-3-2 disconnects, and cuts off the power supply output of earth leakage protective socket/plug.
When being installed, earth leakage protective socket/plug of the present utility model is in when waiting for the operating state reset; if earth leakage protective socket/plug end-of-life; when pressing reset button RESET; K switch R-2, KR-4 closure with reset button RESET interlock directly trigger the controllable silicon conducting, and tripping coil L3 produces magnetic field; the mechanical device that resets/trip action; reset button RESET resets, and supply socket has power supply output, but stops reset button to be threaded off.Even pushing manual test button TEST; the artificial generation when simulating leakage current is because earth leakage protective socket/plug end-of-life can't make the mechanical device that resets/trip move once more; reset button can reset but it is prevented from threading off, and the user should change earth leakage protective socket.
In order to improve the useful life of earth leakage protective socket/plug, avoid because the destruction that the instantaneous pressure that thunderbolt or other reasons cause causes supply socket/attaching plug, shown in Fig. 1-1, Fig. 5-1～Fig. 5-3, the utility model designs respectively at supply socket/attaching plug power input live wire HOT, zero line WHITE place discharge metal sheet 24C/50A, 25C/51A that be used to discharge a, right-angled triangle or isosceles triangle, the vertical tip of placing, the two metal sheets tip is staggered relatively, and keeps certain intervals; Between the two discharge metal sheet tips is half of its distance from bottom A apart from B; The angle of vertical discharge metal sheet 24C/50A, 25C/51A that places and horizontal plane is greater than 90 degree.
In addition, the live wire HOT of power input also links to each other with the zero line WHITE of power input through tripping coil L3, a piezo-resistance MOV.
When acting on earth leakage protective socket owing to the instantaneous pressure that is struck by lightning or other reasons causes; the air dielectric that is connected to the most advanced and sophisticated metal discharge sheet metal at input live wire place and is connected between the discharge metal sheet of most advanced and sophisticated form of metal at input zero line place is breakdown; form atmospherical discharges; most of high pressure consumes by the discharge metal sheet; the residue sub-fraction consumes by tripping coil SOL, piezo-resistance MOV, thereby has protected earth leakage protective socket/plug not broken by high pressure.
In specific embodiment of the utility model, described piezo-resistance MOV selects surge inhibition type piezo-resistance for use, makes it can also play the effect that prevents electrophoresis.
In order to represent the state of supply socket/attaching plug, the utility model is parallel with a power supply output indicator V3 between load output LOAD live wire HOT and zero line WHITE.Working properly when the leakage current detection protection circuit of supply socket/attaching plug, do not have end-of-life, and power supply when output arranged, V3 is bright for the power supply output indicator; Otherwise; leakage current detection protection circuit cisco unity malfunction in earth leakage protective socket/plug; during end-of-life; break down as one of controllable silicon V4, chip IC, tripping coil L3, current-limiting resistance; when causing leakage current detection protection circuit end-of-life forfeiture creepage protection function; because leakage protection circuit can't form the loop; power supply output indicator V3 does not work; pressing testing button TEST can not thread off; show leakage protection circuit end-of-life, the supply socket/attaching plug of reminding the user in time more to finish changing.
Fig. 1-2 is the disclosed leakage current detection protection circuit embodiment 2 physical circuit figure of the utility model.The operation principle of leakage current detection protection circuit shown in Fig. 1-2 and leakage current detection protection circuit shown in Fig. 1-1 is all identical with the operating state of each switch; its difference is: the end of the life-span stop detection K switch R-1 among Fig. 1-2 links to each other with the zero line WHITE of power input LINE by tripping coil L3, and the other end links to each other with the power firestreak HOT that passes differential differentiating transformer coil L1, L2 by current-limiting resistance R4.The end of manual test button TEST links to each other with the zero-power line WHITE of load output LOAD, and the other end links to each other with live wire HOT by resistance R 3.
Fig. 2-1 is the disclosed leakage current detection protection circuit embodiment 3 physical circuit figure of the utility model.Leakage current detection protection circuit shown in Fig. 2-1 is with the difference of leakage current detection protection circuit shown in Fig. 1-1: an end that triggers reverse-blocking tetrode thyristor KR-4 links to each other with the dc power output end of full-wave rectifying circuit is anodal, and the other end links to each other with the anode of controllable silicon V4.
After the power firestreak in power input that earth leakage protective socket/plug of the present utility model is installed and the wall, zero line connect; when not pushing reset button RESET; life-span stop detection K switch R-1 is a closure state, and triggering reverse-blocking tetrode thyristor KR-4 and startup and dropout K switch R-2 is off-state.At this moment, because life-span stop detection K switch R-1 is a closure state, the live wire of power input links to each other with the zero-power line that passes differential differentiating transformer coil L1, L2 through tripping coil L3, closed life-span stop detection K switch R-1, simulation leakage current current-limiting resistance R4, form the loop, produce the simulation leakage current.Leakage current detects the control signal output pin 5 output high level signals of control chip IC, triggers controllable silicon V4.
When pressing reset button RESET, life-span stop detection K switch R-1 still is a closure state, triggering reverse-blocking tetrode thyristor KR-4 and startup and dropout K switch R-2 closure with reset button RESET interlock, controllable silicon V4 conducting, there is enough big exciting current to flow through in the tripping coil L3 of built-in iron core and produces magnetic field, make the mechanical device action that resets/trip shown in Fig. 4-1, Fig. 4-2, reset button RESET can reset.
After discharging reset button RESET, reset button RESET is reset mode, four electric power that link with reset button are connected K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 are closure state, and the load output LOAD of attaching plug/supply socket and power supply output plughole all have power supply output; Simultaneously, with the life-span stop detection K switch R-1 and the triggering reverse-blocking tetrode thyristor KR-4 disconnection of reset button interlock, the simulation leakage current disappears, simulation leakage current EOT, the triggering signal disappearance of controllable silicon V4.Simultaneously, being lockable with dropout K switch R-2 with the startup of reset button interlock still is closure state.
Be built-in with earth leakage protective socket GFCI/ plug of the present utility model and finish and reset, the utility model leakage current detection protection circuit enters whether safety utilization of electric power state of protection output loading.In being built-in with earth leakage protective socket of the present utility model/plug course of work; if electric leakage; during faults such as short circuit; differential differentiating transformer coil L 1; L2 outputs signal to the pin one that leakage current detects control chip IC; 3; 7; the control signal output pin 5 output high level signals of chip IC trigger controllable silicon V4; because being lockable with dropout K switch R-2, startup is closure state; so controllable silicon V4 conducting; there is exciting current to flow through in the tripping coil L3 and produces magnetic field; make Fig. 4-1; resetting shown in Fig. 4-2/mechanical device work of tripping; reset button RESET tripping operation; thread off; four electric power in the electric power output main circuit connect K switch R-2-1; KR-2-2; KR-3-1; KR-3-2 disconnects, and cuts off the power supply output of earth leakage protective socket/plug.Life-span stop detection K switch R-1 returns to initial closure state from off-state, starts with dropout K switch R-2 to return to initial off-state from closure state.
When being installed, earth leakage protective socket/plug of the present utility model is in when waiting for the operating state reset; if earth leakage protective socket/plug end-of-life; the control signal output pin 5 of detection of electrical leakage control chip IC does not have high level signal output all the time; even press reset button RESET; make K switch R-2 with reset button RESET interlock; the KR-4 closure; the controllable silicon V4 conducting that also can't be triggered; excitation-free current flows through in the tripping coil L3; can not produce magnetic field; the mechanical device that resets/trip is failure to actuate; reset button RESET can not reset, and supply socket is prevented from resetting, non-transformer output.Even pushing manual test button TEST, the artificial generation when simulating leakage current, because earth leakage protective socket/plug end-of-life can't make the mechanical device action that resets/trip, reset button can't reset all the time, reminds the user should change new product.
Fig. 2-2 is the disclosed leakage current detection protection circuit embodiment 4 physical circuit figure of the utility model.The difference of leakage current detection protection circuit shown in leakage current detection protection circuit and Fig. 2 shown in Fig. 2-2-1 is: increased by a timer chip IC 2 in leakage current detection protection circuit, the control signal output pin 2 of this timer chip IC2 links to each other with the trigger electrode of controllable silicon V4.Timer chip IC2 regularly exports triggering signal, triggers controllable silicon V4 conducting, regularly detects the utility model and whether still has the current leakage detection protection function, and whether end-of-life of earth leakage protective socket/plug of the present utility model is installed.
Fig. 3 is the disclosed leakage current detection protection circuit embodiment 5 physical circuit figure of the utility model.The difference of leakage current detection protection circuit shown in leakage current detection protection circuit shown in Figure 3 and Fig. 1-1 is: the initial condition of life-span stop detection K switch R-1 is an off-state; when reset button RESET is pressed; life-span stop detection K switch R-1 and reset button RESET interlock are closed; after reset button RESET was released, life-span stop detection K switch R-1 recovered to be off-state from closure state.
Leakage current detection protection circuit shown in Figure 3 is with another difference of leakage current detection protection circuit shown in Fig. 1-1: an end that triggers reverse-blocking tetrode thyristor KR-4 links to each other with the dc power output end of full-wave rectifying circuit is anodal; The other end links to each other by the anode of isolating diode with controllable silicon V4, links to each other with the trigger electrode of controllable silicon V4 by dropping resistor R8 again simultaneously.
After the power firestreak in power input that earth leakage protective socket/plug of the present utility model is installed and the wall, zero line connect; when not pushing reset button RESET, with the life-span stop detection K switch R-1 of reset button RESET interlock, trigger reverse-blocking tetrode thyristor KR-4 and startup and dropout K switch R-2 and all be in off-state.Earth leakage protective socket/plug of the present utility model is installed is in the wait reset mode.
When pressing reset button RESET, with life-span stop detection K switch R-1, triggering reverse-blocking tetrode thyristor KR-4 and the startup and the dropout K switch R-2 closure of reset button RESET interlock.Because life-span stop detection K switch R-1 is a closure state, the live wire of power input links to each other with the zero-power line that passes differential differentiating transformer coil L1, L2 through tripping coil L3, closed life-span stop detection K switch R-1, simulation leakage current current-limiting resistance R4, form the loop, produce the simulation leakage current, leakage current detects the control signal output pin 5 output high level signals of control chip IC, triggers controllable silicon V4.Again since with triggering reverse-blocking tetrode thyristor KR-4 and the startup and the dropout K switch R-2 closure of reset button RESET interlock, the anode of controllable silicon V4 links to each other with the dc power output end of full-wave rectifying circuit is anodal, controllable silicon V4 conducting, there is enough big exciting current to flow through in the tripping coil L3 of built-in iron core and produces magnetic field, make the mechanical device action that resets/trip shown in Fig. 4-1, Fig. 4-2, reset button RESET can reset.
After discharging reset button RESET, reset button RESET is reset mode, four electric power that link with reset button are connected K switch R-2-1, KR-2-2, KR-3-1, KR-3-2 are closure state, and the load output LOAD of attaching plug/supply socket and power supply output plughole all have power supply output; Simultaneously, with the life-span stop detection K switch R-1 and the triggering reverse-blocking tetrode thyristor KR-4 disconnection of reset button interlock, the simulation leakage current disappears, simulation leakage current EOT, the triggering signal disappearance of controllable silicon V4.Simultaneously, being lockable with dropout K switch R-2 with the startup of reset button interlock still is closure state.
Be built-in with earth leakage protective socket GFCI/ plug of the present utility model and finish and reset, the utility model leakage current detection protection circuit enters whether safety utilization of electric power state of protection output loading.In being built-in with earth leakage protective socket of the present utility model/plug course of work; if electric leakage; during faults such as short circuit; differential differentiating transformer coil L1; L2 outputs signal to the pin one that leakage current detects control chip IC; 3; 7; the control signal output pin 5 output high level signals of chip IC trigger controllable silicon V4; because being lockable with dropout K switch R-2, startup is closure state; so controllable silicon V4 conducting; there is exciting current to flow through in the tripping coil L3 and produces magnetic field; make Fig. 4-1; resetting shown in Fig. 4-2/mechanical device work of tripping; reset button RESET tripping operation; thread off; four electric power in the electric power output main circuit connect K switch R-2-1; KR-2-2; KR-3-1; KR-3-2 disconnects, and cuts off the power supply output of earth leakage protective socket/plug.Life-span stop detection K switch R-1 returns to initial closure state from off-state, starts with dropout K switch R-2 to return to initial off-state from closure state.
When being installed, earth leakage protective socket/plug of the present utility model is in when waiting for the operating state reset; if earth leakage protective socket/plug end-of-life; the control signal output pin 5 of detection of electrical leakage control chip IC does not have high level signal output all the time; even press reset button RESET; make K switch R-2 with reset button RESET interlock; the KR-4 closure; the controllable silicon V4 conducting that also can't be triggered; excitation-free current flows through in the tripping coil L3; can not produce magnetic field; the mechanical device that resets/trip is failure to actuate; reset button RESET can not reset, and supply socket is prevented from resetting, non-transformer output.Even pushing manual test button TEST, the artificial generation when simulating leakage current, because earth leakage protective socket/plug end-of-life can't make the mechanical device action that resets/trip, reset button can't reset all the time, reminds the user should change new product.
The above is specific embodiment of the utility model and the know-why used, and is any based on the equivalent transformation on the technical solutions of the utility model basis, all belongs within the utility model protection range.
Claims (12)
1, a kind of leakage current detection protection circuit is characterized in that: this leakage current detection protection circuit comprises the differential differentiating transformer coil (L1 that is used to detect leakage current, L2), be connected switch (KR-2-1 with four electric power of reset button interlock, KR-2-2, KR-3-1, KR-3-2), leakage current detects control chip (IC), controllable silicon (V4), full-wave rectifying circuit (V1～V4), the tripping coil of built-in iron core (L3), triggering reverse-blocking tetrode thyristor (KR-4) with reset button (RESET) interlock, start and dropout switch (KR-2), life-span stop detection switch (KR-1);
Power input (LINE) live wire (HOT), zero line (WHITE) pass described differential differentiating transformer coil (L1, L2) back and are connected switch (KR-2-1, KR-2-2, KR-3-1, KR-3-2) by four electric power with the reset button interlock and link to each other with live wire (HOT), the zero line (WHITE) of live wire (HOT), zero line (WHITE) and the power supply output plughole of power output end (LOAD), and formation electric power is exported main circuit;
The live wire (HOT) of power input (LINE) is by described tripping coil (L3), link to each other with the zero-power line (WHITE) that passes differential differentiating transformer coil (L1, L2) with life-span stop detection switch (KR-1), the simulation leakage current current-limiting resistance (R4) of reset button (RESET) interlock; Perhaps, the zero line (WHITE) of power input (LINE) is by described tripping coil (L3), link to each other with the power firestreak (HOT) that passes differential differentiating transformer coil (L1, L2) with life-span stop detection switch (KR-1), the simulation leakage current current-limiting resistance (R4) of reset button (RESET) interlock;
(V1～ac power input end V4) links to each other with the live wire of power input (HOT), zero line (WHITE) described full-wave rectifying circuit, (dc power output end of V1～V4) is anodal to link to each other by the power supply input pin (6) of resistance (R1) with described leakage current detection control chip (IC) full-wave rectifying circuit, simultaneously, (dc power output end of V1～V4) is anodal to link to each other with the anode of dropout switch (KR-2) with controllable silicon (V4) by described startup full-wave rectifying circuit; (the dc power output end negative pole of V1～V4) links to each other for the negative electrode that leakage current detects the ground pin (4) of control chip (IC) and controllable silicon (V4) and full-wave rectifying circuit;
The signal input tube pin (1,3,7) that leakage current detects control chip (IC) links to each other with the signal output part of differential differentiating transformer coil (L1, L2) respectively, and the control signal output pin (5) that leakage current detects control chip (IC) links to each other with the trigger electrode of controllable silicon (V4).
2, leakage current detection protection circuit according to claim 1; it is characterized in that: (anodal the linking to each other of dc power output end of V1～V4), the other end passes through resistance (R8) and links to each other with the trigger electrode of controllable silicon (V4) for an end of described triggering reverse-blocking tetrode thyristor (KR-4) and described full-wave rectifying circuit.
3, leakage current detection protection circuit according to claim 1 and 2, it is characterized in that: the initial condition of described life-span stop detection switch (KR-1) is a closure state, when the power input live wire that supply socket/attaching plug of the present utility model is installed, power firestreak in zero line and the wall, after zero line connects, when not operating any parts, life-span stop detection switch (KR-1) is a closure state, the live wire of power input or zero line are through tripping coil (L3), closed life-span stop detection switch (KR-1), simulate leakage current current-limiting resistance (R4) and pass differential differentiating transformer coil (L1, L2) zero-power line or live wire link to each other, form the loop, produce the simulation leakage current;
When reset button (RESET) when being pressed, described life-span stop detection switch (KR-1) still is a closure state, when reset button (RESET) when resetting, described life-span stop detection switch (KR-1) is an off-state, when reset button (RESET) was threaded off, described life-span stop detection switch (KR-1) was a closure state;
The initial condition of described startup and dropout switch (KR-2) is an off-state; When reset button (RESET) when being pressed, described startup and dropout switch (KR-2) become closure state by off-state; When reset button (RESET) when resetting, described startup and dropout switch (KR-2) are lockable and are closure state; When reset button (RESET) was threaded off, described startup and dropout switch (KR-2) returned to initial off-state;
The initial condition of described triggering reverse-blocking tetrode thyristor (KR-4) is an off-state; When reset button (RESET) when being pressed, described triggering reverse-blocking tetrode thyristor (KR-4) becomes closure state by off-state; When reset button (RESET) resetted and threads off, described triggering reverse-blocking tetrode thyristor (KR-4) returned to initial off-state.
4, leakage current detection protection circuit according to claim 1; it is characterized in that: (anodal the linking to each other of dc power output end of V1～V4), the other end links to each other with the anode of controllable silicon (V4) for an end of described triggering reverse-blocking tetrode thyristor (KR-4) and described full-wave rectifying circuit.
5, leakage current detection protection circuit according to claim 1 is characterized in that: an end of described triggering reverse-blocking tetrode thyristor (KR-4) and described full-wave rectifying circuit (anodal the linking to each other of dc power output end of V1～V4);
The other end of described triggering reverse-blocking tetrode thyristor (KR-4) links to each other with anode with the trigger electrode of controllable silicon (V4).
6, according to claim 1 or 2 or 4 or 5 described leakage current detection protection circuits, it is characterized in that: the initial condition of described life-span stop detection switch (KR-1) is an off-state; When reset button (RESET) when being pressed, described life-span stop detection switch (KR-1) becomes closure state by off-state, the live wire of power input or zero line link to each other with the zero-power line or the live wire that pass differential differentiating transformer coil (L1, L2) through tripping coil (L3), closed life-span stop detection switch (KR-1), simulation leakage current current-limiting resistance (R4), form the loop, produce the simulation leakage current; When reset button (RESET) resetted and threads off, described life-span stop detection switch (KR-1) returned to initial off-state;
The initial condition of described startup and dropout switch (KR-2) is an off-state; When reset button (RESET) when being pressed, described startup and dropout switch (KR-2) become closure state by off-state; When reset button (RESET) when resetting, described startup and dropout switch (KR-2) are lockable and are closure state; When reset button (RESET) was threaded off, described startup and dropout switch (KR-2) returned to initial off-state;
The initial condition of described triggering reverse-blocking tetrode thyristor (KR-4) is an off-state; When reset button (RESET) when being pressed, described triggering reverse-blocking tetrode thyristor (KR-4) becomes closure state by off-state; When reset button (RESET) resetted and threads off, described triggering reverse-blocking tetrode thyristor (KR-4) returned to initial off-state.
7, according to claim 1 or 2 or 4 or 5 described leakage current detection protection circuits, it is characterized in that: also include timer chip (IC2) in this leakage current detection protection circuit, the control signal output pin (2) of this timer chip (IC2) links to each other with the trigger electrode of controllable silicon (V4); Timer chip (IC2) is regularly exported triggering signal, triggers controllable silicon (V4) conducting.
8, leakage current detection protection circuit according to claim 7; it is characterized in that: this leakage current detection protection circuit also comprises a manual test button (TEST); one end of this manual test button (TEST) links to each other with live wire (HOT) or the zero line of load output (LOAD), and the other end links to each other with zero-power line (WHITE) or live wire by resistance (R3).
9, leakage current detection protection circuit according to claim 8 is characterized in that: this leakage current detection protection circuit also is included in one that power input live wire (HOT), zero line (WHITE) locate to design respectively that be used to discharge, right-angled triangle or discharge metal sheet isosceles triangle, tip;
The most advanced and sophisticated symmetrical placement of described two metal sheets, and keep certain intervals; Distance (B) between the two discharge metal sheet tips is half of its distance from bottom (A);
The angle of vertical described discharge metal sheet of placing and horizontal plane is greater than 90 degree.
10, leakage current detection protection circuit according to claim 9 is characterized in that: this leakage current detection protection circuit also comprises by a piezo-resistance (MOV);
The live wire of power input (HOT) links to each other with the zero line (WHITE) of power input through described tripping coil (L3), piezo-resistance (MOV).
11, leakage current detection protection circuit according to claim 10 is characterized in that: described piezo-resistance (MOV) is selected surge inhibition type piezo-resistance for use.
12, leakage current detection protection circuit according to claim 11; it is characterized in that: this leakage current detection protection circuit also includes a power supply output indicator (V3), and this power supply output indicator is connected in parallel between load output live wire (LOAD HOT) and the zero line (WHITE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200037513U CN201422011Y (en) | 2009-01-13 | 2009-01-23 | Leakage-detecting protective circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920105064.2 | 2009-01-13 | ||
| CN200920105064 | 2009-01-13 | ||
| CN2009200037513U CN201422011Y (en) | 2009-01-13 | 2009-01-23 | Leakage-detecting protective circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201422011Y true CN201422011Y (en) | 2010-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200037513U Expired - Fee Related CN201422011Y (en) | 2009-01-13 | 2009-01-23 | Leakage-detecting protective circuit |
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| CN (1) | CN201422011Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130575A (en) * | 2010-12-08 | 2011-07-20 | 河南省电力公司许昌供电公司 | AC load start-stop control circuit |
| CN102208797A (en) * | 2010-03-29 | 2011-10-05 | 黄华道 | Novel protection circuit with electric leakage detection function |
| CN103219702A (en) * | 2013-03-21 | 2013-07-24 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit capable of performing timed self-detection |
-
2009
- 2009-01-23 CN CN2009200037513U patent/CN201422011Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102208797A (en) * | 2010-03-29 | 2011-10-05 | 黄华道 | Novel protection circuit with electric leakage detection function |
| CN102130575A (en) * | 2010-12-08 | 2011-07-20 | 河南省电力公司许昌供电公司 | AC load start-stop control circuit |
| CN102130575B (en) * | 2010-12-08 | 2013-02-06 | 河南省电力公司许昌供电公司 | AC load start-stop control circuit |
| CN103219702A (en) * | 2013-03-21 | 2013-07-24 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit capable of performing timed self-detection |
| CN103219702B (en) * | 2013-03-21 | 2018-07-13 | 温州市万盛电器有限公司 | It can electric leakage detection protection circuit capable of performing timed self-detection |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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