CN201422012Y - Leakage detection and protection circuit with end-of-life detection and display function - Google Patents
Leakage detection and protection circuit with end-of-life detection and display function Download PDFInfo
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- CN201422012Y CN201422012Y CN2009201052031U CN200920105203U CN201422012Y CN 201422012 Y CN201422012 Y CN 201422012Y CN 2009201052031 U CN2009201052031 U CN 2009201052031U CN 200920105203 U CN200920105203 U CN 200920105203U CN 201422012 Y CN201422012 Y CN 201422012Y
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Abstract
The utility model discloses a leakage detection and protection circuit with an end-of-life detection and display function, which is characterized in that the circuit comprises an analogue leakage current generation circuit capable of automatically generating analogue leakage current without the need to operate any components, wherein, the power supply input end neutral wire of the leakage detection and protection circuit is connected with the power supply input end live wire through an analogue leakage current generation switch and an analogue leakage current limiting resistor in linkage witha reset button to form the analogue leakage current generation circuit. In the utility model, a power supply output indicator light is connected between the live wire and the neutral wire of the powersupply output end of the leakage detection and protection circuit; and a life normality indication light is connected in series in a controllable silicon breakover loop and is used for indicating whether a leakage protection socket is out of service and whether the power supply output is active. In the utility model, a lightning-protection metal sheet used for discharging is connected further with the power supply input end, and the live wire of the power supply input end is connected with the power supply neutral wire through a tripping electromagnetic coil and a varistor. The utility modelis complete in function, good at safety protection, and can display the status of the leakage protection socket on a real-time basis.
Description
Technical field
The utility model relates to 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; specifically, the utility model relates to and need not to operate the leakage current detection protection circuit that any parts just can carry out life-span stop detection to earth leakage protective socket automatically and show testing result after a kind of power line in earth leakage protective socket power input and wall connects.This leakage current detection protection circuit is also to having protective effect owing to the instantaneous pressure that is struck by lightning or other reasons causes to the destruction that earth leakage protective socket/plug causes; And has a function that stops the reverse wiring mistake.
Background technology
Along with the continuous development of earth leakage protective socket (being called for short GFCI)/plug industry, people require more and more higher to the safety in utilization of earth leakage protective socket/plug.Hope when its inner components and parts lost efficacy the forfeiture creepage protection function when its end-of-life, can in time be reminded the user in the use of earth leakage protective socket/plug, change new product.
Yet; its inner leakage current detection protection circuit of common in the market earth leakage protective socket/plug; not only do not have life end checking function; and; when its end-of-life, concerning the user without any prompt facility, its reset button still can reset; the single-phase three-wire power supply output plughole of the load output of earth leakage protective socket and receptacle face still has power supply output, misleads the user and continues 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.
In addition, common in the market its inner leakage current detection protection circuit of earth leakage protective socket/plug does not also have the function that stops the reverse wiring mistake.When the installer linked to each other the power line in the wall mistakenly with the load output of earth leakage protective socket, under the situation of not pushing reset button, the single-phase three-wire power supply output plughole of earth leakage protective socket/plug surface just had power supply output.When leaky appears in electrical appliance work, because not work of leakage current detection protection circuit,, very easily cause the get an electric shock generation of dead accident of user so this earth leakage protective socket/plug does not have any protective effect.
Summary of the invention
In view of the foregoing, main purpose of the present utility model provide in a kind of supply socket/plug that is applied to have creepage protection function, after the power input of earth leakage protective socket and the power line in the wall connect, need not to operate any parts and just can whether still have the leakage current detection protection circuit that creepage protection function detected and showed testing result to earth leakage protective socket automatically.When the earth leakage protective socket inner member is intact when not having end-of-life, this leakage current detection protection circuit can make normal indicator light of life-span bright, expression can be set up correct reset mechanism automatically resets reset button, after resetting, life-span, normal indicator light extinguished, the power supply output indicator is bright, illustrates that earth leakage protective socket can operate as normal; When earth leakage protective socket inner member open circuit or short circuit are end-of-life; the utility model leakage current detection protection circuit does not work by normal indicator light of life-span and represents this earth leakage protective socket end-of-life, the earth leakage protective socket of reminding the user in time more to renew.
Another purpose of the present utility model provides a kind of leakage current detection protection circuit that the destruction that supply socket/plug is caused owing to the instantaneous pressure that is struck by lightning or other reasons causes is shielded.
Another purpose of the present utility model provides a kind of leakage current detection protection circuit that stops reverse wiring mistake function that has; when the installer links to each other the power line in the wall mistakenly with earth leakage protective socket load output; this leakage current detection protection circuit is not worked, and the power supply output plughole of the power input of earth leakage protective socket/plug and receptacle face does not all have power supply output.
For achieving the above object, the utility model is by the following technical solutions: a kind of leakage current detection protection circuit with life-span stop detection and Presentation Function, this leakage current detection protection circuit include one and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically;
This simulation leakage current generating circuit is made of simulation leakage current generating switch, simulation leakage current current-limiting resistance, the dropout solenoid with the reset button interlock;
Described simulation leakage current generating switch has a pair of normally-closed contact and a pair of normally opened contact; Its common links to each other with the live wire or the zero line of power input by the dropout solenoid that is built-in with iron core; Its normally-closed contact links to each other with zero-power line that passes differential differentiating transformer or live wire by simulation leakage current current-limiting resistance; Its normally opened contact links to each other with the zero line or the live wire of power input by the silicon controlled anode;
The zero line of power input or live wire be through simulation leakage current current-limiting resistance, link to each other with the live wire or the zero line of power input with normally-closed contact, the dropout solenoid of the simulation leakage current generating switch of reset button interlock, constitutes to need not to operate any parts and can produce the simulation leakage current generating circuit of simulating leakage current automatically.
This leakage current detection protection circuit also include be used to represent leakage current detection protection circuit whether end-of-life normal indicator light of life-span and be used to represent whether leakage current detection protection circuit has the power supply output indicator of power supply output;
Described power supply output indicator is located on the circuit board, light lead pipe below, is connected power output end live wire, zero line two ends; The light lead pipe is used for light drawn delivers to receptacle face; When the supply socket wiring is correct, when reset button resetted, this power supply output indicator was bright, and load out-put supply jack has power supply output; When the supply socket wiring correct, but socket in creepage protection function lost efficacy or open circuit, short circuit, reset button is prevented from resetting, the power supply output indicator does not work, the caution user; When supply socket wiring error, the power supply output indicator is bright, and load output end power jack does not have power supply output, and reset button is prevented from resetting, the caution user;
One end of described normal indicator light of life-span links to each other with silicon controlled anode in the leakage current detection protection circuit, and the other end links to each other by the common port of current-limiting resistance with described simulation leakage current generating switch; When leakage current detection protection circuit was working properly, along with the silicon controlled conducting, the life-span, normal indicator light was bright, illustrated that leakage current detection protection circuit has creepage protection function; Otherwise; when leakage current detection protection circuit can not be working properly; during leakage current detection protection circuit end-of-life forfeiture creepage protection function; life-span, normal indicator light did not work; show leakage current detection protection circuit end-of-life; the earth leakage protective socket of reminding the user in time more to finish changing, and stop resetting of earth leakage protective socket automatically.
This leakage current detection protection circuit also includes a starting switch that resets that links with reset button; One end of the described starting switch that resets links to each other with the live wire or the zero line of power input by the dropout solenoid; The other end links to each other with the controllable silicon anode, and the controllable silicon trigger electrode detects control chip control signal output pin with leakage current and links to each other, and the controllable silicon negative electrode links to each other with zero-power line or power firestreak;
The a pair of normally-closed contact and a pair of normally opened contact of the described starting switch that resets, formation simulation leakage current generating switch are controlled by the interlock of reset button all, and the switching logic relational expression of three switches is:
If the state of the described starting switch that resets is K1, the state of a pair of normally opened contact is that the state of K2, a pair of normally-closed contact is K3; Closure state is " 1 ", and off-state is " 0 ", 1=0;
After power supply in the power input of leakage current detection protection circuit and the wall connected, reset button was waited for the state of detection certainly before resetting: K1=K2=K3;
When reset button is pressed: K1=K2=K3;
The snap close that earth leakage protective socket resets/trips in the mechanical device is opened, when reset button is not released: K1=K2=K3;
Reset button resets and waits for when threading off: K1=K2=K3;
Above-mentioned one of four states moves in circles, otherwise shows the leakage current detection protection circuit end-of-life, and the earth leakage protective socket reset button can't reset.
With the live wire of described power input and power input lug plate that zero line, input wires screw link to each other on respectively design be useful on discharge, right-angled triangle or discharge metal sheet isosceles triangle, most advanced and sophisticated head, the most advanced and sophisticated symmetrical placement of two metal sheets, and keep certain intervals; Distance between the most advanced and sophisticated head of two discharge metal sheets is half of its distance from bottom; The angle of vertical discharge metal sheet of placing and horizontal plane is greater than 90 °.
Be connected with respectively at power output end power firestreak, the zero line place of this leakage current detection protection circuit one that be used to discharge, can prevent the point discharge sheet metal that the load end connecting circuit is struck by lightning to be damaged.
The live wire of described leakage current detection protection circuit power input or zero line also link to each other with the zero line or the live wire of power input through solenoid, a piezo-resistance.
This leakage current detection protection circuit also comprises a circuit that manually produces the simulation leakage current; The circuit that should manually produce the simulation leakage current comprises Test Switchboard and the simulation leakage current current-limiting resistance that links with testing button; One end of Test Switchboard links to each other with power input zero line or live wire by simulation leakage current current-limiting resistance, and the other end links to each other with the live wire or the zero line of leakage current detection protection circuit power output end.
Described leakage current detection protection circuit is connected switch by the differential differentiating transformer, the control chip that are used for detecting leakage current, the dropout solenoid, the controllable silicon that are built-in with iron core, described simulation leakage current generating switch, four electric power of starting switch and at least two groups that reset with the reset button interlock that are connected on supply line.
One end of one group of electric power connection switch in described four electric power connection switch passes differential differentiating transformer by lead and links to each other with power input live wire, zero line, and the other end links to each other with power output end; The end that another group electric power connects switch is connected switch with last one group of electric power power output end links to each other, and the other end links to each other with supply hub.
The leakage current detection signal output of described differential differentiating transformer links to each other with the signal input part of control chip, and the control signal output ends of control chip links to each other with the silicon controlled trigger electrode; The working power input of control chip links to each other with the live wire or the zero line of power input by diode, resistance, dropout solenoid, and perhaps the working power input of control chip links to each other with the live wire or the zero line of power input by resistance, diode, dropout solenoid; The place of working pin of control chip links to each other with the zero line or the live wire of power input.
Described silicon controlled negative electrode links to each other with the zero line or the live wire of power input, and the silicon controlled anode links to each other with power input live wire or zero line through the starting switch that resets, the dropout solenoid with the reset button interlock; Silicon controlled anode warp links to each other with power input live wire or zero line with a pair of normally opened contact, the dropout solenoid of the simulation leakage current generating switch of reset button interlock;
The silicon controlled anode is through with a pair of normally-closed contact, the simulation leakage current current-limiting resistance of the starting switch that resets of reset button interlock, simulation leakage current generating switch and pass differential differentiating transformer and link to each other with zero-power line or live wire.
The disclosed leakage current detection protection circuit with life-span stop detection and Presentation Function of the utility model is in when resetting starting state in reset button, and the described life-span of input normal power supply, normal indicator light was bright;
Press the start button that the resets starting switch closure that resets, form the exciting current that starts the dropout solenoid, current path is: electric current through the zero line of power input or live wire, dropout solenoid, the closed starting switch that resets, the be triggered controllable silicon of conducting, get back to the live wire or the zero line of power input;
The a pair of normally-closed contact that simulation electric leakage this moment produces switch is in closure state, and a pair of normally opened contact is connected switch with four electric power and still is in off-state.
When reset button is in the back that resets and waits for trip status, power output end has electric power output, it is closed simultaneously that a pair of normally-closed contact that the starting switch that resets disconnects, simulates electric leakage generation switch already disconnects, a pair of normally opened contact is connected switch with four electric power, and the power supply output indicator that is connected on the power output end is bright.
Also include a timer chip in the disclosed earth leakage protective socket control circuit of the utility model, the control signal output ends 2 of this timer chip extremely links to each other with silicon controlled control, periodically export control signal and make the controllable silicon conducting, make the supply socket automatic trip, tripping operation back normal indicator light of life-span lights, and relay indicating light extinguishes; Leakage current detection protection circuit can carry out self check again and wait for that the user resets, and regularly detects leakage current detection protection circuit and whether still has creepage protection function.
Described simulation leakage current generating switch be positioned at release near, with reset button interlock, this simulation leakage current generating switch is made of conducting metal spare and two sheet metals; Conducting metal spare is positioned at below, and in the middle of sheet metal was positioned at, sheet metal was positioned at the top; Fast separation member extends a haptic element downwards, and this haptic element is against on the sheet metal that is positioned at the centre position, and the sheet metal in the middle of being positioned at contacts conducting with conducting metal spare below being positioned at, constitutes a pair of normally-closed contact; Sheet metal in the middle of being positioned at constitutes a pair of normally opened contact with the sheet metal that is positioned at the top;
When reset button was in trip status, nethermost conducting metal spare contacted conducting with the sheet metal in centre position, constituted the normally-closed contact closure in the simulation leakage current generating switch; When reset button was in reset mode, the sheet metal in nethermost conducting metal spare and centre position disconnected, and the sheet metal in centre position changes into the top sheet metal and contact conducting, constitutes a pair of normally opened contact closure of simulating in the leakage current generating switch;
Below conducting metal spare links to each other with zero-power line that passes differential differentiating transformer or power firestreak by simulation leakage current current-limiting resistance, and the sheet metal in centre position links to each other with power firestreak or zero-power line by the dropout solenoid; The unsettled top that is positioned at intermediate metal film of one end of the top sheet metal, the other end links to each other with controllable silicon is anodal, finally is connected to zero-power line or power firestreak by controllable silicon.
The described starting switch that resets is positioned at release below, and on the dropout solenoid body panel or in the circuit board the side links with reset button;
This starting switch that resets is made of elastic sheet metal and electric contact; Wherein an end of elastic sheet metal is welded on the circuit board, links to each other with the live wire of power input or the zero line of power input by the dropout solenoid; The unsettled top that is positioned at electric contact of the other end contacts with electric contact or disconnects; Electric contact one end links to each other with the controllable silicon anode, and the controllable silicon trigger electrode detects control chip control signal output pin with leakage current and links to each other, and the controllable silicon negative electrode links to each other with zero-power line or power firestreak.
When reset button was in trip status, reset mode, this starting switch that resets was in off-state; When reset button is depressed, this starting switch closure that resets; When reset button resets when being released, this starting switch that resets becomes off-state from closure state, the normally-closed contact of simulation leakage current generating switch becomes off-state from closure state, the normally opened contact of simulation leakage current generating switch is converted to closure state from off-state, life-span, normal indicator light extinguished, and the power supply output indicator is bright.
Description of drawings
Fig. 1 is the leakage current detection protection circuit embodiment 1 physical circuit figure that the utlity model has life-span stop detection and Presentation Function;
Fig. 2 is the leakage current detection protection circuit embodiment 2 physical circuit figure that the utlity model has life-span stop detection and Presentation Function;
Fig. 3 is the supply socket internal structure schematic diagram that the utility model leakage current detection protection circuit is installed, when reset button is trip status, and the state diagram of simulation leakage current generating switch, the starting switch that resets;
Fig. 4 is the supply socket internal structure schematic diagram that the utility model leakage current detection protection circuit is installed, when reset button is pressed, and the state diagram of simulation leakage current generating switch, the starting switch that resets;
Fig. 5 is the supply socket internal structure schematic diagram that the utility model leakage current detection protection circuit is installed, when the reset button reset mode, and the state diagram of simulation leakage current generating switch, the starting switch that resets;
Fig. 6 is the mechanical device decomposition texture schematic diagram that resets/trip that supply socket of the present utility model inside is installed;
Fig. 7-1～Fig. 7-3 is for being installed in discharge metal sheet position, the structural representation of the utility model leakage current detection protection circuit power input.
Embodiment
Fig. 1 is the leakage current detection protection circuit physical circuit figure that the utlity model has detection of electrical leakage, defencive function, and the difference of this leakage current detection protection circuit and common leakage current detection protection circuit is: the disclosed leakage current detection protection circuit of the utility model has need not to operate the function that any parts just can carry out life-span stop detection to earth leakage protective socket automatically and show testing result after the power line in earth leakage protective socket power input and the wall connects; To the destruction that earth leakage protective socket causes being had defencive function owing to the instantaneous pressure that is struck by lightning or other reasons causes; And, also have the function that stops the reverse wiring mistake.
As shown in Figure 1, the disclosed leakage current detection protection circuit of the utility model is mainly by the differential differentiating transformer L1 (1000: 1) that is used to detect leakage current; L2 (200: 1); control chip IC (RV4145); be built-in with the dropout solenoid L3 (SOL) of iron core; controllable silicon V4; simulation leakage current generating switch with earth leakage protective socket reset button RESET interlock; be connected in the supply line and four power switch KR-2-1 reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2; the starting switch KR-4 that resets with reset button RESET interlock; normal indicator light V5 of life-span; power supply output indicator V3 and simulation leakage current current-limiting resistance R4; R3 and some diodes; resistance; compositions such as electric capacity.
After the live wire HOT of earth leakage protective socket power input LINE, zero line WHITE pass differential differentiating transformer L1, L2, link to each other with live wire, the zero line of the single-phase three-wire power supply output plughole on earth leakage protective socket surface by power switch KR-2-1, KR-2-2 with reset button RESET interlock; Simultaneously, live wire HOT, the zero line WHITE of the single-phase three-wire power supply output plughole on earth leakage protective socket surface link to each other with live wire HOT, the zero line WHITE of earth leakage protective socket power output end (load link) LOAD by power switch KR-3-1, the KR-3-2 of another group with reset button RESET interlock again.
As shown in Figure 1 and Figure 2, the leakage current detection signal output of differential differentiating transformer L1, L2 links to each other with the signal input part 1,2,3,7 of control chip IC, and the control signal output ends 5 of control chip IC links to each other with the trigger electrode of controllable silicon V4.The working power input 6 of control chip IC links to each other with live wire HOT or the zero line WHITE of earth leakage protective socket power input LINE by diode V1, resistance R 1, dropout solenoid L3; perhaps the working power input 6 of control chip IC links to each other with live wire HOT or the zero line WHITE of earth leakage protective socket power input LINE by resistance R 1, diode V1, dropout solenoid L3, and the place of working pin 4 of control chip IC links to each other with zero line WHITE or the live wire HOT of earth leakage protective socket power input LINE.
As shown in Figure 1 and Figure 2, the negative electrode of controllable silicon V4 links to each other with zero line WHITE or the live wire HOT of earth leakage protective socket power input LINE, and the anode warp of controllable silicon V4 links to each other with power input live wire HOT or zero line WHITE with the starting switch KR-4 that resets, the dropout solenoid L3 of the normally open of reset button RESET interlock; Simultaneously, the anode of controllable silicon V4 also links to each other with power input live wire HOT or zero line WHITE by normally opened contact KR-2, the dropout solenoid L3 of simulation leakage current generating switch.
Simulation leakage current generating switch is a switch that has a pair of normally-closed contact KR-1 and a pair of normally opened contact KR-2, and its common A links to each other with the live wire HOT of earth leakage protective socket power input LINE by dropout solenoid L3; Its normally-closed contact KR-1 links to each other with the zero-power line WHITE that passes differential differentiating transformer L1, L2 by simulation leakage current current-limiting resistance R4; Its normally opened contact KR-2 links to each other with the anode of controllable silicon V4.
The iron core that is built in the dropout solenoid L3 resets/or dropout reset button RESET by resetting in the earth leakage protective socket/mechanical device that trip (as shown in Figure 6); thereby make and power switch KR-2-1, the KR-2-2 of reset button RESET interlock, KR-3-1, KR-3-2 closure/or disconnect; and the disconnection of simulation leakage current generating switch normally-closed contact/or closed, the normally opened contact closure/or disconnect.
Between the live wire of earth leakage protective socket power output end LOAD and zero line, be connected with one and be used to represent whether earth leakage protective socket has the power supply output indicator LED1 (V3) of power supply output.When earth leakage protective socket had power supply output, LED1 was bright; Otherwise LED1 does not work.
Be connected with one between the common port A of the anode B of the controllable silicon V4 in leakage current detection protection circuit and simulation leakage current generating switch and be used to represent the whether normal indicator light LED2 of life-span (V5) of end-of-life of earth leakage protective socket.When leakage current detection protection circuit working properly, constitute the element of leakage current detection protection circuit such as controllable silicon V4, dropout solenoid L3, differential differentiating transformer L1, L2, control chip IC is intact, controllable silicon V4 is intact can normally the time, conducting along with controllable silicon V4, life-span, normal indicator light LED2 was bright, illustrated that earth leakage protective socket has creepage protection function; Otherwise; when leakage current detection protection circuit can not be working properly; as one of element controllable silicon V4, dropout solenoid L3, differential differentiating transformer L1, L2, control chip IC of constituting leakage current detection protection circuit break down; when causing leakage current detection protection circuit end-of-life forfeiture creepage protection function; because leakage current detection protection circuit can't form the loop; life-span, normal indicator light LED2 did not work; show leakage current detection protection circuit end-of-life, the earth leakage protective socket of reminding the user in time more to finish changing.
As shown in Figure 3-Figure 5, normal indicator light LED2 of power supply output indicator LED1 (V3) and life-span (V5) be located on the circuit board, light lead pipe 77 belows; Light lead pipe 77 is used for light drawn delivers to receptacle face.
As shown in Figure 1; the power input zero line WHITE that constitutes the utility model leakage current detection protection circuit is through simulation leakage current current-limiting resistance R4, link to each other with power input live wire HOT with normally-closed contact KR-1, the dropout solenoid L3 (SOL) of the simulation leakage current switch of reset button RESET interlock, and formation need not to operate any parts can produce a simulation leakage current generating circuit of simulating leakage current automatically.After the power input LINE of earth leakage protective socket and the power line in the wall connect; when reset button RESET is in trip status and does not reset; be that earth leakage protective socket is in initial condition; when reset button RESET is not pressed; owing to be in closure state with the normally-closed contact KR-1 of the simulation leakage current generating switch of reset button RESET interlock; its live wire HOT and zero line WHITE with power input directly is communicated with; produce the simulation leakage current; so; after the power input of earth leakage protective socket and the power line in the wall connect, need not to operate the above-mentioned simulation leakage current generating of any parts circuit and can produce a simulation leakage current automatically.When leakage current detection protection circuit was working properly, the simulation leakage current of generation flow through differential differentiating transformer L1, L2, and differential differentiating transformer L1, L2 output signal to control chip IC, and the 5 pin output high-level control signal of control chip IC triggers controllable silicon V4.At this moment; press reset button RESET; starting switch KR-4 closure resets; the controllable silicon V4 conducting that is triggered; there is big electric current to flow through in the dropout solenoid L3; dropout solenoid L3 produces magnetic field, and its built-in iron core action makes the mechanical device action that resets/trip as shown in Figure 6; reset button RESET action; the normally opened contact KR-2 closure of simulation leakage current generating switch, normally-closed contact KR-1 disconnects, and the simulation leakage current disappears; the normal indicator light V5 of life-span that is connected between AB does not work; expression earth leakage protective socket function is intact, has creepage protection function, and reset button can reset.
Otherwise; if leakage current detection protection circuit can't operate as normal; current leakage jack life termination; then not conducting of controllable silicon V4; all the time there is not big electric current to flow through in the dropout solenoid L3; can't produce magnetic field; its inner iron core is failure to actuate; the mechanical device that resets/trip shown in Figure 6 is failure to actuate all the time, and reset button can not be reset all the time, and the life-span, normal indicator light V5 did not work all the time; power supply output indicator V3 does not work yet; thereby prompting user this earth leakage protective socket is end-of-life, the earth leakage protective socket that should more finish changing.
When pressing reset button RESET, when the normally-closed contact KR-1 of simulation leakage current generating switch does not disconnect as yet, starting switch KR-4 and the reset button RESET interlock owing to reset, starting switch KR-4 closure resets, this moment is because the closure of KR-4 makes A point and B point short circuit, the voltage at former AB two ends is added on dropout solenoid (SOL) L3, making has certain electric current to flow through and produces magnetic field in the dropout solenoid, inner iron core is done ballistic motion, by the mechanical device that resets/trip reset button can be resetted; The light-emitting diode V5 that is connected between A point, B point is in cut-off state, and the V5 lamp goes out; Simultaneously, because reset button RESET resets, the normally-closed contact KR-1 in the simulation leakage current switch that links is with it disconnected, the simulation leakage current disappears.After reset button RESET resets, Lian Dong KR-2-1 with it, KR-2-2, KR-3-1, the KR-3-2 closure, earth leakage protective socket has power supply output, and V3 is bright for the power supply output indicator, shows that the single-phase three-wire jack of receptacle face and load output all have power supply output.
When the earth leakage protective socket function is intact, after earth leakage protective socket correctly inserts power supply, press reset button RESET, load end LOAD and receptacle face have electric power output, socket operate as normal.This moment is when having leakage current generating in the circuit, because power firestreak HOT and zero line WHITE pass differential differentiating transformer L1 (1000: 1) and the L2 (200: 1) that is used to detect leakage current simultaneously, pass current phasor in two power lines of differential differentiating transformer L1 and L2 and non-vanishing in the circuit, the voltage signal that differential differentiating transformer L1 and L2 induce certain value at once is input to IC, output a control signal to the trigger electrode of controllable silicon V4 from 5 pin of IC, controllable silicon V4 is triggered, the positive pole place B point of controllable silicon V4 is an electronegative potential, because simulate the normally opened contact KR-2 of leakage current generating switch this moment is closure state, A point and B point are same point, because of the other end of dropout solenoid L3 links to each other with power firestreak, the two ends of dropout solenoid L3 will obtain the voltage of certain value, there is certain electric current to flow through, produce magnetic field, its inner iron core is done ballistic motion, reset button RESET is threaded off, the output of cutting off the electricity supply, the normally opened contact KR-2 of simulation leakage current generating switch becomes off-state by closure state, normally-closed contact KR-1 changes closure state again into, power supply output indicator V3 extinguishes, and the life-span, normal indicator light V5 was bright.
As Fig. 3, shown in Figure 6, described simulation leakage current generating switch be positioned at release 28 near, with reset button 8 interlock, this simulation leakage current generating switch is made of conducting metal spare 66 and two sheet metals 67,88; Conducting metal spare 66 is positioned at below, and in the middle of sheet metal 88 was positioned at, sheet metal 67 was positioned at the top; Fast separation member 28A extends a haptic element 28E downwards, and this haptic element 28E is against on the sheet metal 88 that is positioned at the centre position, makes the sheet metal 88 in the middle of being positioned at contact conducting with conducting metal spare 66 below being positioned at, constitutes a pair of normally-closed contact KR-1; Sheet metal 88 in the middle of being positioned at constitutes a pair of normally opened contact KR-2 with the sheet metal that is positioned at the top 67.
As shown in Figure 3, when reset button 8 is in trip status, nethermost conducting metal spare 66 contacts conducting with the sheet metal 88 in centre position, constitute the normally-closed contact KR-1 in the simulation leakage current generating switch, the sheet metal 88 in centre position disconnects with the sheet metal that is positioned at the top 67, constitutes the normally opened contact KR-2 in the simulation leakage current generating switch; As shown in Figure 4, when reset button 8 was pressed, the normally-closed contact KR-1 that constitutes in the simulation leakage current generating switch was still closed, and normally opened contact KR-2 disconnects; As shown in Figure 5, when reset button 8 is in reset mode, nethermost conducting metal spare 66 disconnects with the sheet metal 88 in centre position, and the sheet metal 88 in centre position changes into the top sheet metal 67 and contact conducting, constitutes a pair of normally opened contact KR-2 closure of simulating in the leakage current generating switch.
As Fig. 3, shown in Figure 6, the described starting switch KR-4 that resets is positioned at release 28 belows, and side on the dropout solenoid body panel or in the circuit board is with reset button 8 interlocks.This starting switch KR-4 that resets is made of elastic sheet metal 72 and electric contact 72A; One end of elastic sheet metal 72 is welded on the circuit board, links to each other with the live wire of power input or the zero line of power input by dropout solenoid L3; The unsettled top that is positioned at electric contact 72A of the other end contacts with electric contact 72A or disconnects; Electric contact 72A is welded on the circuit board, and the one end links to each other with controllable silicon V4 anode, and the trigger electrode of controllable silicon V4 detects control chip IC control signal output pin with leakage current and links to each other, and the controllable silicon negative electrode links to each other with zero-power line or power firestreak.
As Fig. 3, shown in Figure 5, when reset button 8 was in trip status, reset mode, this starting switch KR-4 that resets was in off-state; As shown in Figure 4, when reset button 8 is depressed, this starting switch KR-4 closure that resets; When reset button 8 resets when being released, this starting switch KR-4 that resets becomes off-state from closure state, the normally-closed contact KR-1 of simulation leakage current generating switch becomes off-state from closure state, the normally opened contact KR-2 of simulation leakage current generating switch is converted to closure state from off-state, life-span, normal indicator light V5 extinguished, and V3 is bright for the power supply output indicator.
The a pair of normally-closed contact KR-1 and a pair of normally opened contact KR-2 of the described starting switch KR-4 that resets, formation simulation leakage current generating switch are controlled by the interlock of reset button RESET all, and the switching logic relational expression of three switches is:
If the state of the described starting switch that resets is K1, the state of a pair of normally opened contact is that the state of K2, a pair of normally-closed contact is K3; Closure state is " 1 ", and off-state is " 0 ", 1=0;
After power supply in the power input of leakage current detection protection circuit and the wall connected, reset button was waited for the state of detection certainly before resetting: K1=K2=K3;
When reset button is pressed: K1=K2=K3;
The snap close that earth leakage protective socket resets/trips in the mechanical device is opened, when reset button is not released: K1=K2=K3;
Reset button resets and waits for when threading off: K1=K2=K3;
Above-mentioned one of four states moves in circles, otherwise shows the leakage current detection protection circuit end-of-life, and the earth leakage protective socket reset button can't reset.
The utility model can also manually produce the simulation leakage current by pushing testing button TEST, detects whether end-of-life of earth leakage protective socket.As shown in Figure 1, link to each other with power input zero line WHITE by simulating leakage current current-limiting resistance R3 with the end of the Test Switchboard KR-5 of testing button TEST interlock, the other end links to each other with the live wire of earth leakage protective socket power output end LOAD.
When whether just often detecting the earth leakage protective socket function, can push testing button TEST, make with it the Test Switchboard KR-5 closure of interlock, produce the simulation leakage current, detect whether end-of-life of earth leakage protective socket.If leakage current detection protection circuit can't operate as normal, current leakage jack life termination, then normal indicator light V5 does not work the life-span, and reset button RESET can not reset.
In above various situations, the control signal of exporting from 5 pin of IC must suppress the generation of false triggering through being attempted by the filtering of the anti-interference capacitor C 5 between silicon controlled trigger electrode and the ground.
In order to improve the useful life of earth leakage protective socket; avoid because the destruction that the instantaneous pressure that thunderbolt or other reasons cause causes earth leakage protective socket; as shown in Figure 1; the utility model is at power input LINE place, with on live wire HOT and the power supply input wires sheet that zero line WHITE, input wires screw 10,9 link to each other respectively design be useful on discharge, right-angled triangle or discharge metal sheet 24C, 25C isosceles triangle, most advanced and sophisticated head.Shown in Fig. 7-1～Fig. 7-3, the most advanced and sophisticated symmetrical placement of two metal sheets, and keep certain intervals; Between the most advanced and sophisticated head of two discharge metal sheet 24C, 25C is half of its distance from bottom A apart from B; The angle of vertical discharge metal sheet 24C, 25C that places and horizontal plane is greater than 90 °.
In addition, the live wire HOT of power input also links to each other with the zero line WHITE of power input through dropout solenoid L3, a piezo-resistance MOV.
When the live wire of power input and zero line because thunderbolt or other reasons when causing instantaneous pressure; the air dielectric that is connected to the point discharge sheet metal at input live wire place and is connected between the point discharge sheet 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 dropout solenoid L3, piezo-resistance MOV, thereby has protected leakage current detection protection circuit.
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.
As shown in Figure 1, the utility model also has the defencive function that stops the reverse wiring mistake.As shown in the figure, link to each other by K switch R-3-1, KR-3-2 between the single-phase three-wire supply hub of earth leakage protective socket load output LOAD and receptacle face with reset button RESET interlock; The live wire of earth leakage protective socket input LINE; the live wire of the single-phase three-wire supply hub of zero line and receptacle face; between the zero line also be by with the K switch R-2-1 of reset button RESET interlock; KR-2-2 links to each other; so; when the installer links to each other the power line in the wall mistakenly with earth leakage protective socket load output LOAD; the utility model need not to operate circuit that any parts can produce the simulation leakage current automatically (by the normally-closed contact KR-1 of simulation leakage current switch; resistance R 4; dropout solenoid SOL constitutes) can't produce leakage current; control chip IC can't export control signal; not conducting of controllable silicon V4; there is not electric current to flow through in the dropout solenoid L3; can't produce magnetic field and promote built-in iron core action wherein; the mechanical device that resets/trip shown in Figure 6 is failure to actuate; automatically stop reset button to reset; K switch R-2-1 with reset button RESET interlock; KR-2-2; KR-3-1; KR-3-2 is in off-state all the time; can't be closed; the equal non-transformer output of the input LINE of earth leakage protective socket and the supply hub of receptacle face; life-span, normal indicator light V5 did not work; power supply output indicator V3 can be bright, shows wiring error.After the erector had only wiring correct, the life-span, normal indicator light V5 was just bright, and reset button just can reset.
Fig. 2 is the utility model embodiment 2 leakage current detection protection circuit physical circuit figure.Its operation principle is identical with the leakage current detection protection circuit of embodiment 1 shown in Figure 1.The leakage current detection protection circuit shown in Figure 2 and the difference of leakage current detection protection circuit shown in Figure 1 are: leakage current detection protection circuit also includes a timer chip IC 2,6 pin of this timer chip IC2 are by the anode of resistance R 7 with described controllable silicon V4, the control signal output ends 2 of timer chip IC2 links to each other with the trigger electrode of controllable silicon V4, periodically export control signal and make controllable silicon V4 conducting, make the supply socket automatic trip, tripping operation back normal indicator light V5 of life-span lights, and relay indicating light V3 extinguishes; Leakage current detection protection circuit can carry out self check again and wait for that the user resets, and regularly detects leakage current detection protection circuit and whether still has creepage protection function.
As shown in Figure 1 and Figure 2, be useful on point discharge sheet metal 50A, the 51A of discharge in the power firestreak HOT that passes differential differentiating transformer L1, L2, the design of zero line WHITE place.
In sum, because the utility model adopts above technical scheme, so the disclosed leakage current detection protection circuit of the utility model has following outstanding advantage:
(1) after the power line in earth leakage protective socket power input and the wall connects; need not to operate any parts; just can produce the simulation leakage current automatically, detect earth leakage protective socket and whether still have the i.e. end-of-life whether of creepage protection function, and show testing result.
A. intact when the element that constitutes leakage current detection protection circuit, when leakage current detection protection circuit does not have end-of-life, the life-span, normal indicator light V5 was bright, expression can be set up correct reset mechanism automatically can reset reset button; After resetting, V3 is bright for the power supply output indicator, and the life-span, normal indicator light V5 extinguished, and illustrates that earth leakage protective socket can operate as normal;
B. when the element open circuit that constitutes leakage current detection protection circuit or short circuit are end-of-life; life-span, normal indicator light V5 did not work; represent this leakage current detection protection circuit end-of-life; and stop reset button to reset; make the load output of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output, power supply output indicator V3 does not work.
So, the user can the state by normal indicator light V5 of life-span, power supply output indicator V3 judge earth leakage protective socket whether end-of-life with and operating state.
(2), the defencive function that has the destruction that anti-lightning strike and instantaneous pressure that other reasons causes causes earth leakage protective socket.
(3) has manual detection and show the function of testing result
A. produce leakage current when manually simulating, leakage current detection protection circuit is working properly, when not having end-of-life, life-span, normal indicator light V5 was bright, illustrated that earth leakage protective socket can operate as normal, and can reset, after resetting, the life-span, normal indicator light V5 went out, and V3 is bright for the power supply output indicator;
B. produce leakage current when manually simulating; during the leakage current detection protection circuit end-of-life; life-span, normal indicator light V5 did not work; this earth leakage protective socket end-of-life is described; and stop reset button to reset; make the load output of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output, power supply output indicator V3 does not work.
(4) has the defencive function that stops the reverse wiring mistake.
When erector or electrician are connected to the power line in the wall on the earth leakage protective socket output mistakenly; the utility model need not to operate the circuit that any parts can produce the simulation leakage current automatically can't produce leakage current; control chip IC can't produce control signal; not conducting of controllable silicon V4; there is not electric current to flow through in the dropout solenoid L3; can't produce magnetic field and promote built-in iron core action wherein; the machinery trip gear can't move; automatically stop reset button to reset; the output of socket non-transformer; life-span, normal indicator light V5 did not work, and showed wiring error.After the erector had only wiring correct, the life-span, normal indicator light V5 was just bright, and reset button just can reset, and the earth leakage protective socket power output end just has power supply output, and power supply output indicator V3 is just bright.
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 (15)
1, a kind of leakage current detection protection circuit with life-span stop detection and Presentation Function is characterized in that: this leakage current detection protection circuit includes one and need not to operate the simulation leakage current generating circuit that any parts can produce the simulation leakage current automatically;
This simulation leakage current generating circuit is made of simulation leakage current generating switch, simulation leakage current current-limiting resistance (R4), the dropout solenoid (L3) with the reset button interlock;
Described simulation leakage current generating switch has a pair of normally-closed contact (KR-1) and a pair of normally opened contact (KR-2); Its common (88) links to each other with the live wire or the zero line of power input by the dropout solenoid (L3) that is built-in with iron core; Its normally-closed contact (KR-1) links to each other with the zero-power line or the live wire that pass differential differentiating transformer (L1, L2) by simulation leakage current current-limiting resistance (R4); Its normally opened contact (KR-2) links to each other with the zero line or the live wire of power input by the anode of controllable silicon (V4);
The zero line of power input or live wire are through simulation leakage current current-limiting resistance (R4), link to each other with the live wire or the zero line of power input with normally-closed contact (KR-1), the dropout solenoid (L3) of the simulation leakage current generating switch of reset button interlock, and formation need not to operate any parts can produce the simulation leakage current generating circuit of simulating leakage current automatically.
2, a kind of leakage current detection protection circuit with life-span stop detection and Presentation Function according to claim 1 is characterized in that: this leakage current detection protection circuit also include be used to represent leakage current detection protection circuit whether end-of-life normal indicator light of life-span (V5) and be used to represent whether leakage current detection protection circuit has the power supply output indicator (V3) of power supply output;
Described power supply output indicator (V3) is located on the circuit board, light lead pipe (77) below, is connected power output end live wire, zero line two ends; Light lead pipe (77) is used for light drawn delivers to receptacle face;
The anode (B) of the controllable silicon (V4) in one end of normal indicator light of described life-span (V5) and the leakage current detection protection circuit links to each other, and the other end links to each other with the common port (A) of described simulation leakage current generating switch by current-limiting resistance (R6).
3, a kind of leakage current detection protection circuit with life-span stop detection and Presentation Function according to claim 2 is characterized in that: this leakage current detection protection circuit also includes a starting switch that resets (KR-4) that links with reset button;
One end of the described starting switch that resets (KR-4) links to each other with the live wire or the zero line of power input by dropout solenoid (L3); The other end links to each other with controllable silicon (V4) anode, and controllable silicon (V4) trigger electrode detects control chip (IC) control signal output pin with leakage current and links to each other, and the controllable silicon negative electrode links to each other with zero-power line or power firestreak;
The a pair of normally-closed contact (KR-1) and a pair of normally opened contact (KR-2) of the described starting switch that resets (KR-4), formation simulation leakage current generating switch are controlled by the interlock of reset button all.
4, according to claim 1 or 2 or 3 described a kind of leakage current detection protection circuits with life-span stop detection and Presentation Function, it is characterized in that: with the live wire of described power input and power input lug plate that zero line, input wires screw (10,9) link to each other on respectively design be useful on discharge, right-angled triangle or discharge metal sheet (25C, 24C) isosceles triangle, most advanced and sophisticated head, the most advanced and sophisticated symmetrical placement of two metal sheets, and keep certain intervals; Distance between the most advanced and sophisticated head of two discharge metal sheets (25C, 24C) is half of its distance from bottom; The angle of vertical discharge metal sheet of placing (25C, 24C) and horizontal plane is greater than 90 °.
5, a kind of leakage current detection protection circuit with life-span stop detection and Presentation Function according to claim 4 is characterized in that: be connected with respectively at power output end power firestreak, the zero line place of this leakage current detection protection circuit one that be used to discharge, can prevent the point discharge sheet metal that the load end connecting circuit is damaged by being struck by lightning.
6, according to claim 1 or 2 or 3 or 5 described a kind of leakage current detection protection circuits with life-span stop detection and Presentation Function, it is characterized in that: the live wire of described leakage current detection protection circuit power input or zero line also pass through solenoid (L3), a piezo-resistance (MOV) links to each other with the zero line or the live wire of power input.
7, a kind of leakage current detection protection circuit with life-span stop detection and Presentation Function according to claim 6 is characterized in that: this leakage current detection protection circuit also comprises a circuit that manually produces the simulation leakage current;
The circuit that should manually produce the simulation leakage current comprises Test Switchboard (KR-5) and the simulation leakage current current-limiting resistance (R3) that links with testing button; One end of Test Switchboard (KR-5) links to each other with power input zero line or live wire by simulation leakage current current-limiting resistance (R3), and the other end links to each other with the live wire or the zero line of leakage current detection protection circuit power output end.
8, a kind of leakage current detection protection circuit with life-span stop detection and Presentation Function according to claim 7 is characterized in that: described leakage current detection protection circuit is connected switch (KR-2-1 and KR-2-2, KR-3-1 and KR-3-2) by the differential differentiating transformer that is used for detecting leakage current (L1, L2), control chip (IC), the dropout solenoid (L3) that is built-in with iron core, controllable silicon (V4), described simulation leakage current generating switch, four electric power of starting switch that resets (KR-4) and at least two groups with the reset button interlock of being connected on supply line.
9, a kind of leakage current detection protection circuit according to claim 8 with life-span stop detection and Presentation Function, it is characterized in that: an end of the one group of electric power connection switch (KR-2-1, KR-2-2) in described four electric power connection switch passes differential differentiating transformer (L1, L2) by lead and links to each other with power input live wire, zero line, and the other end links to each other with power output end;
The end that another group electric power connects switch is connected switch with last one group of electric power power output end links to each other, and the other end links to each other with supply hub.
10, a kind of leakage current detection protection circuit according to claim 9 with life-span stop detection and Presentation Function, it is characterized in that: the leakage current detection signal output of described differential differentiating transformer (L1, L2) links to each other with the signal input part (1,2,3,7) of control chip (IC), and the control signal output ends (5) of control chip (IC) links to each other with the trigger electrode of controllable silicon (V4); The working power input (6) of control chip (IC) links to each other with the live wire or the zero line of power input by diode (V1), resistance (R1), dropout solenoid (L3), and perhaps the working power input (6) of control chip (IC) links to each other with the live wire or the zero line of power input by resistance (R1), diode (V1), dropout solenoid (L3); The place of working pin (4) of control chip (IC) links to each other with the zero line or the live wire of power input.
11, according to Claim 89 described a kind of leakage current detection protection circuits, with life-span stop detection and Presentation Function, it is characterized in that: the negative electrode of described controllable silicon (V4) links to each other with the zero line or the live wire of power input, and the anode of controllable silicon (V4) links to each other with power input live wire or zero line through the starting switch that resets (KR-4), the dropout solenoid (L3) with the reset button interlock;
The anode warp of controllable silicon (V4) links to each other with power input live wire or zero line with a pair of normally opened contact (KR-2), the dropout solenoid (L3) of the simulation leakage current generating switch of reset button interlock;
The anode of controllable silicon (V4) through and a pair of normally-closed contact (KR-1), the simulation leakage current current-limiting resistance (R4) of the starting switch that resets (KR-4) of reset button interlock, simulation leakage current generating switch and pass differential differentiating transformer and link to each other with zero-power line or live wire.
12, a kind of leakage current detection protection circuit according to claim 11 with life-span stop detection and Presentation Function, it is characterized in that: press the start button that resets starting switch (KR-4) closure that resets, form the exciting current that starts dropout solenoid (L3), current path is: electric current through the zero line of power input or live wire, dropout solenoid (L3), the closed starting switch that resets (KR-4), the be triggered controllable silicon (V4) of conducting, get back to the live wire or the zero line of power input;
The a pair of normally-closed contact (KR-1) that simulation electric leakage this moment produces switch is in closure state, and a pair of normally opened contact (KR-2) is connected switch (KR-2-1, KR-2-2, KR-3-1, KR-3-2) and still is in off-state with four electric power.
13, according to claim 10,11,12 described a kind of leakage current detection protection circuits with life-span stop detection and Presentation Function; it is characterized in that: also include a timer chip (IC2) in this earth leakage protective socket control circuit; the control signal output ends 2 of this timer chip (IC2) extremely links to each other with the control of controllable silicon (V4), periodically exports control signal and makes controllable silicon (V4) conducting.
14, a kind of leakage current detection protection circuit according to claim 13 with life-span stop detection and Presentation Function, it is characterized in that: described simulation leakage current generating switch be positioned at release (28) near, with reset button (8) interlock, this simulation leakage current generating switch is made of conducting metal spare (66) and two sheet metals (67,88); Conducting metal spare (66) is positioned at below, and in the middle of sheet metal (88) was positioned at, sheet metal (67) was positioned at the top; Separation member (28A) extends a haptic element (28E) downwards fast, this haptic element (28E) is against on the sheet metal (88) that is positioned at the centre position, sheet metal (88) in the middle of being positioned at contacts conducting with conducting metal spare (66) below being positioned at, constitutes a pair of normally-closed contact (KR-1); Sheet metal (88) in the middle of being positioned at constitutes a pair of normally opened contact (KR-2) with the sheet metal (67) that is positioned at the top;
When being in trip status, nethermost conducting metal spare (66) contacts conducting with the sheet metal (88) in centre position in reset button (8), constitutes normally-closed contact (KR-1) closure in the simulation leakage current generating switch; In reset button (8) when being in reset mode, nethermost conducting metal spare (66) disconnects with the sheet metal (88) in centre position, the sheet metal in centre position (88) changes into the top sheet metal (67) and contacts conducting, constitutes a pair of normally opened contact (KR-2) closure in the simulation leakage current generating switch;
Below conducting metal spare (66) links to each other with the zero-power line or the power firestreak that pass differential differentiating transformer (L1, L2) by simulating leakage current current-limiting resistance (R4), and the sheet metal in centre position (88) links to each other with power firestreak or zero-power line by dropout solenoid (L3); The unsettled top that is positioned at intermediate metal film (88) of one end of the top sheet metal (67), the other end links to each other with controllable silicon is anodal, finally is connected to zero-power line or power firestreak by controllable silicon.
15, a kind of leakage current detection protection circuit according to claim 14 with life-span stop detection and Presentation Function, it is characterized in that: the described starting switch that resets (KR-4) is positioned at release (28) below, on the dropout solenoid body panel or in the circuit board the side links with reset button (8);
This starting switch that resets is made of elastic sheet metal (72) and electric contact (72A); Wherein an end of elastic sheet metal (72) is welded on the circuit board, links to each other with the live wire of power input or the zero line of power input by the dropout solenoid; The unsettled top that is positioned at electric contact (72A) of the other end contacts with electric contact (72A) or disconnects; Electric contact (72A) end links to each other with controllable silicon (V4) anode, and controllable silicon (V4) trigger electrode detects control chip (IC) control signal output pin with leakage current and links to each other, and the controllable silicon negative electrode links to each other with zero-power line or power firestreak.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201052031U CN201422012Y (en) | 2009-01-14 | 2009-01-14 | Leakage detection and protection circuit with end-of-life detection and display function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201052031U CN201422012Y (en) | 2009-01-14 | 2009-01-14 | Leakage detection and protection circuit with end-of-life detection and display function |
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| Publication Number | Publication Date |
|---|---|
| CN201422012Y true CN201422012Y (en) | 2010-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201052031U Expired - Lifetime CN201422012Y (en) | 2009-01-14 | 2009-01-14 | Leakage detection and protection circuit with end-of-life detection and display function |
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| CN (1) | CN201422012Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306924A (en) * | 2011-09-14 | 2012-01-04 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
| CN105699885A (en) * | 2012-07-27 | 2016-06-22 | 胡小青 | Improved type detection device having phase generation circuit |
| CN110429595A (en) * | 2019-08-27 | 2019-11-08 | 广东美的厨房电器制造有限公司 | Circuit structure and household electrical appliance |
-
2009
- 2009-01-14 CN CN2009201052031U patent/CN201422012Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306924A (en) * | 2011-09-14 | 2012-01-04 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
| CN102306924B (en) * | 2011-09-14 | 2013-11-20 | 黄华道 | Leakage detecting protection circuit capable of periodically automatically detecting function integrity |
| CN105699885A (en) * | 2012-07-27 | 2016-06-22 | 胡小青 | Improved type detection device having phase generation circuit |
| CN110429595A (en) * | 2019-08-27 | 2019-11-08 | 广东美的厨房电器制造有限公司 | Circuit structure and household electrical appliance |
| CN110429595B (en) * | 2019-08-27 | 2021-02-23 | 广东美的厨房电器制造有限公司 | Circuit structure and household appliance |
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Granted publication date: 20100310 |