CN101113998B - Circuit for automatically detecting creepage protecting socket electrifying whether or not end of life - Google Patents
Circuit for automatically detecting creepage protecting socket electrifying whether or not end of life Download PDFInfo
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- CN101113998B CN101113998B CN200610088904XA CN200610088904A CN101113998B CN 101113998 B CN101113998 B CN 101113998B CN 200610088904X A CN200610088904X A CN 200610088904XA CN 200610088904 A CN200610088904 A CN 200610088904A CN 101113998 B CN101113998 B CN 101113998B
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Abstract
The invention discloses a leakage protection socket and a circuit automatically detecting whether the life is terminated, and the invention comprises a main circuit, a simulation leakage current producing circuit, a reset button state identification circuit, a simulation detection feedback circuit, a reset voltage output circuit, a life terminating detection judging circuit, a manual test circuit and a state display circuit. After the leakage protection socket is energized, the life terminating detection judging circuit automatically outputs a control signal to cause the simulation leakage current producing circuit to produce a simulation leakage current; then, according the detection results of the simulation detection feedback circuit, the leakage protection socket is judged whether is provided with a leakage protection function, that is, whether the life is terminated, and the judging results is displayed by the state display circuit. If the leakage protection socket is intact, the life terminating detection judging circuit outputs the control signal, the reset button is normally reset by the reset voltage output circuit, otherwise, the reset button is prevented from normally resetting.
Description
Technical field
The present invention relates to a kind of be applied in the earth leakage protective socket (GFCI) automatically whether it is still had the circuit that creepage protection function (promptly whether end-of-life) detects after electric; specifically; the present invention relates among a kind of GFCI of being applied to; need not to operate any parts after powering on and to carry out life-span stop detection automatically; automatically set up correct reset mechanism, and show the circuit of testing result.
Background technology
Along with popularizing of household electrical appliance, when household electrical appliance offered convenience to people, its security is paid more and more attention also, and therefore various earth leakage protective sockets (GFCI) are born thereupon.Meanwhile cause the problem of another worth people's deep thinking; fault has appearred if that is exactly an earth leakage protective socket itself; make it lose creepage protection function; it has been its end-of-life; and the user does not know fully; in this case, earth leakage protective socket has just lost the meaning of its existence, the effect of the protection that can not recur.So the safe condition of earth leakage protective socket itself also should be informed the user with a kind of mode, so that arouse attention, the GFCI that replacing has in time been broken down prevents the generation of the dead accident of electric shock that causes owing to its inefficacy.
Yet at present common earth leakage protective socket is after its inner main key components breaks down, and earth leakage protective socket all still can be reset and energized.In case leaky occurs in the circuit in this case, situation is breakneck, and earth leakage protective socket possibly can't trip, and causes the generation of electric shock accidents.
Summary of the invention
In view of the foregoing; fundamental purpose of the present invention provides and a kind ofly need not to operate any parts behind the power supply just can whether still have creepage protection function to it automatically promptly whether end-of-life detects in earth leakage protective socket is connected wall; set up correct reset mechanism, and show the circuit of testing result.
Another object of the present invention provides a kind of after earth leakage protective socket is each time threaded off tripping operation, all can whether end-of-life detect once more to earth leakage protective socket automatically, and set up correct reset mechanism, and show the circuit of testing result.
Another purpose of the present invention provides a kind of when pushing testing button (TEST) routine inspection earth leakage protective socket each time and whether have creepage protection function; all can whether end-of-life detects once more to earth leakage protective socket automatically; set up correct reset mechanism, and show the circuit of testing result.
For achieving the above object, the present invention is by the following technical solutions: whether a kind of creepage protecting socket electrifying detects the end-of-life circuit automatically, and it is made of main circuit, simulation leakage current generating circuit, reset button state identification circuit, analog detection feedback circuit, resetting voltage output circuit, life terminating detection judging circuit, manual test circuit and status display circuit;
Main circuit mainly is to detect in the current supply circuit whether have leakage current, and the output control signal resets reset button or threads off;
Simulation leakage current generating circuit mainly is behind the power connection in earth leakage protective socket and wall, to need not to operate any assembly and produce the simulation leakage current automatically, and when current leakage jack life termination, demonstration fail operation state; The reset button state identification circuit mainly is the state of identification reset button, and gives life terminating detection judging circuit with detected reset button state transfer;
The analog detection feedback circuit mainly is to detect the earth leakage protective socket main circuit whether still to have creepage protection function, and gives life terminating detection judging circuit with detected result transmission;
The resetting voltage output circuit mainly is to provide operating voltage for circuit that the driving reset button in the main circuit resets;
The major function of life terminating detection judging circuit is: after earth leakage protective socket powered on, the automatic output control signal made simulation leakage current generating circuit produce the simulation leakage current; According to the testing result of analog detection feedback circuit, judge whether earth leakage protective socket has creepage protection function, i.e. end-of-life whether, and show judged result by status display circuit;
The manual test circuit mainly is manually to produce the simulation leakage current;
Status display circuit mainly is to show the earth leakage protective socket normal operating conditions;
More than the annexation of each ingredient be:
The power input of main circuit links to each other with power firestreak, zero line in the wall, and its power output end is power firestreak, the zero line of earth leakage protective socket output;
The signal input part of analog detection feedback circuit links to each other with the circuit that the driving reset button in the main circuit is moved, and its signal output part links to each other with the signal input part of life terminating detection judging circuit;
The signal output part of reset button state identification circuit links to each other with another signal input part of life terminating detection judging circuit;
The signal output part of manual test circuit links to each other with the another signal input part of life terminating detection judging circuit;
A signal output part of life terminating detection judging circuit links to each other with the control end of simulation leakage current generating circuit, and whether control simulation leakage current generating circuit produces leakage current; Another signal output part of life terminating detection judging circuit links to each other with the control end of resetting voltage output circuit, and the circuit that resets for the driving reset button in the main circuit provides operating voltage, thereby sets up the mechanism of reset button proper reset; The another signal output part of life terminating detection judging circuit links to each other with status display circuit, shows the power supply and the failure state of earth leakage protective socket.
Described life terminating detection judging circuit latchs flip chip and constitutes by putting count/to reset, 1 pin that putting count/resets latchs flip chip is the resetting voltage output terminal, it links to each other with status display circuit with the resetting voltage output circuit, for the resetting voltage output circuit provides resetting voltage, for the normal condition pilot lamp of status display circuit provides driving voltage; Its 2 pin links to each other with reset button state identification circuit, manual test circuit for starting test input; Its 3 pin is simulation leakage current generating control end, and it links to each other with simulation leakage current generating, display circuit, and the driving voltage of automatic leakage current generation and malfunction pilot lamp display circuit is provided; Its 5 pin is a simulation test feedback signal input end, links to each other with the analog detection feedback circuit, accepts the detection of the earth leakage protective socket key components failure effect creepage protection function of feedback.
Described simulation leakage current generating circuit is by rectifier bridge, one-way SCR, and transformer is formed; The former limit winding of transformer links to each other with the pin 3 that latchs flip chip that count/resets of putting in the described life terminating detection judging circuit through on-off element, the output terminal of the secondary winding of transformer extremely links to each other with the control of one-way SCR, silicon controlled anode, negative electrode link to each other with the dc voltage output end of rectifier bridge respectively, and the ac power input end of rectifier bridge links to each other with the zero line of power firestreak that passes differential differentiating transformer and power input respectively.
Described reset button state identification circuit is made of the switch with the reset button interlock; Switch is made up of fixed mount, two spring leafs, and one of them spring leaf links to each other with the pin 2 that latchs flip chip that count/resets of putting in the life terminating detection judging circuit by resistance, electric capacity, and another spring leaf links to each other with zero-power line.
Described resetting voltage output circuit is made of the reset trigger power condition switch with the reset button interlock, power condition switch is made of two spring leafs, the pin 5 that leakage current in one of them spring leaf and the main circuit detects control chip links to each other, and another spring leaf links to each other with the pin 1 that latchs flip chip that count/resets of putting in the life terminating detection judging circuit by resistance.
Described manual test circuit by with the switch of manual test button interlock and the resistance that is used to produce leakage current constitute, after switch and the resistance series connection, one end links to each other with the power firestreak that passes differential differentiating transformer, and the other end links to each other with zero-power line and forms closed manually simulation leakage current path.
Description of drawings
Whether Fig. 1 detects the theory diagram of end-of-life circuit automatically for creepage protecting socket electrifying of the present invention
Fig. 2 is the further concrete detailed theory diagram of the present invention
Fig. 3 is K switch R1, the KR4 structural representation of the present invention and reset button interlock
Fig. 4 is physical circuit figure of the present invention
Fig. 5 count/resets for the present invention puts and latchs the inner concrete wiring diagram of flip chip IC2 (model ZQC-051208T)
Fig. 6 count/resets for the present invention puts and latchs the inner concrete wiring diagram of flip chip IC2 (model ZQC-051208H)
Embodiment
As shown in Figure 1, creepage protecting socket electrifying disclosed by the invention detects automatically whether the end-of-life circuit mainly is made of main circuit U1, simulation leakage current generating circuit U 2, reset button state identification circuit U3, analog detection feedback circuit U4, resetting voltage output circuit U5, life terminating detection judging circuit U6, manual test circuit U 7 and status display circuit U8.
Main circuit U1 major function is to detect in the current supply circuit whether have leakage current, and the output control signal resets reset button or threads off.
Simulation leakage current generating circuit U 2 mainly is behind the power connection in earth leakage protective socket and wall, to need not to operate any assembly and produce the simulation leakage current automatically, and when current leakage jack life termination, demonstration fail operation state.
Reset button state identification circuit U3 mainly is the state of identification reset button, and gives life terminating detection judging circuit U6 with detected reset button state transfer.
Analog detection feedback circuit U4 detects earth leakage protective socket main circuit U1 whether still to have creepage protection function, and gives life terminating detection judging circuit U6 with detected result transmission.
Resetting voltage output circuit U5 major function is that the circuit that the driving reset button among the main circuit U1 is resetted is charged.
The major function of life terminating detection judging circuit U6 is: after 1, earth leakage protective socket powers on; U3 can send a state recognition signal automatically to U6; make U6 start test; drive leakage current generating circuit U 2 and produce leakage current; according to the testing result of analog detection feedback circuit U4, judge whether earth leakage protective socket has creepage protection function, i.e. end-of-life whether; and by status display circuit U2, U8 shows judged result.2, in the earth leakage protective socket use; when whether having creepage protection function by manual test circuit U 7 test earth leakage protective sockets; the result that life terminating detection judging circuit U6 detects according to analog detection feedback circuit U4; judge whether earth leakage protective socket has creepage protection function; i.e. end-of-life whether; and by status display circuit U2, U8 shows the last judged result again.3, when current leakage jack life termination, the output control signal makes the output of resetting voltage output circuit U5 no-voltage, and the circuit that the driving reset button resets among the main circuit U1 does not have operating voltage, stops reset button to reset.
Manual test circuit U 7 mainly is manually to produce the simulation leakage current and output signal to U6, restarts life terminating detection judging circuit U6, and the GFCI end-of-life that tries again is whether judgement.
Status display circuit U8 shows earth leakage protective socket normal operating conditions and malfunction.
As shown in Figure 1, the power input of main circuit U1 links to each other with power firestreak, zero line in the wall, and its power output end is power firestreak, the zero line of earth leakage protective socket output, and the single-phase three-wire output plughole;
The signal input part of analog detection feedback circuit U4 links to each other with the circuit that the driving reset button among the main circuit U1 is moved, and its signal output part links to each other with the signal input part of life terminating detection judging circuit U6;
The signal output part of reset button state identification circuit U3 links to each other with another signal input part of life terminating detection judging circuit U6;
The signal output part of manual test circuit U 7 links to each other with the another signal input part of life terminating detection judging circuit U6;
The signal output part of life terminating detection judging circuit U6 links to each other with the control end of simulation leakage current generating circuit U 2, and whether control simulation leakage current generating circuit U 2 produces leakage current; Another signal output part of life terminating detection judging circuit U6 links to each other with the control end of resetting voltage output circuit U5, and the circuit that resets for the driving reset button among the main circuit U1 provides operating voltage, thereby sets up the correct reset mechanism of reset button; The another signal output part of life terminating detection judging circuit U6 links to each other with status display circuit U8, shows the state of earth leakage protective socket.
Principle of work of the present invention is: 1, after the power input of earth leakage protective socket main circuit U1 and the power firestreak in the wall, zero line are connected, need not to operate any assembly, U3 can send a state recognition signal automatically to U6, U6 is started test and export control signal, simulation leakage current generating circuit U 2 is produced simulate leakage current to U2; 2, if earth leakage protective socket does not have end-of-life, still has creepage protection function, then the leakage current detection circuit among the main circuit U1 can be exported control signal and make the circuit operation that drives the reset button action, after analog detection feedback circuit U4 detects this state, output signal to life terminating detection judging circuit U6, life terminating detection judging circuit U6 then exports control signal immediately and no longer produces the simulation leakage current for simulation leakage current generating circuit U 2, simultaneously, life terminating detection judging circuit U6 output control signal is given resetting voltage output circuit U5 and U8, make its output resetting voltage give the circuit of the driving reset button action among the main circuit U1, reset button can normally be resetted, and the back status display circuit that resets can show; 3, if current leakage jack life termination, do not had creepage protection function, be leakage current detection circuit among the main circuit U1 or the circuit cisco unity malfunction that drives the reset button action, analog detection feedback circuit U4 cannot obtain feedback signal, just there is not control signal to pass to U6 yet, life terminating detection judging circuit U6 control signal all the time gives simulation leakage current generating circuit U 2, make it produce the simulation leakage current all the time, simultaneously, life terminating detection judging circuit U6 does not export resetting voltage and gives U5, reset button can not normally be resetted all the time, and then make the load output terminal of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output; 4, life terminating detection judging circuit U6 is according to the duty of earth leakage protective socket, and the output control signal is given status display circuit U2, and U8 lights the pilot lamp of different colours, the state of expression earth leakage protective socket.
After earth leakage protective socket is threaded off tripping operation each time, after reset button state identification circuit U3 detects reset button state (released state of K switch R1 when resetting suddenly change the closure state after thread off), output signal to life terminating detection judging circuit U6, life terminating detection judging circuit U6 triggers back output control signal and gives simulation leakage current generating circuit U 2, make it produce the simulation leakage current, life terminating detection judging circuit U6 is according to the signal of analog detection feedback circuit U4 feedback, judge whether end-of-life of earth leakage protective socket, whether still has creepage protection function, thereby the output resetting voltage is given resetting voltage output circuit U5, whether the circuit by the driving reset button action among the resetting voltage output circuit U5 control main circuit U1 works, and then control reset button whether can reset, set up correct reset mechanism; Simultaneously, life terminating detection judging circuit U6 is according to the state of earth leakage protective socket, the output control signal is given status display circuit U2, U8, when being in, the green normal operating conditions pilot lamp of U8 just often treats indicating status (promptly being triggered drives and do not add the power supply state, can resetting and lighted) with reset button; The red-fault working station indicator of U2 is in normal bright state when fault, and the indication earth leakage protective socket life-span stops.
When pushing testing button (TEST) routine inspection earth leakage protective socket each time and whether have creepage protection function; manual test circuit U 7 produces and sends a signal that starts the automatic test of U6 when manually simulating leakage current; thereby start U6 and test driving U2 generation simulation leakage current automatically automatically; superimposed with the manual simulation leakage current that U7 produces; the output control signal drove the button action circuit controllable silicon conducting that resets after main circuit U1 detected this leakage current, made its dropout.The dropout of reset button causes reset button state identification circuit U3 transmit status identification signal and gives U6, again cause current leakage jack life termination whether detection, whether U6 can feed back analog detection signal according to U4, judge whether end-of-life of earth leakage protective socket, whether still has creepage protection function, thereby the output control signal is given resetting voltage output circuit U5, whether the circuit by the driving reset button action among the resetting voltage output circuit U5 control main circuit U1 works, and then control reset button whether can reset, set up correct reset mechanism; Simultaneously; life terminating detection judging circuit U6 is according to the state of earth leakage protective socket; the output control signal is given status display circuit U2, U8; the green indicating lamp of U8 is in treat illuminating state (to be triggered and to drive and do not add power supply; wait for resetting of reset button), make the red led of U2 be in normal bright state during fault.
Whether Fig. 2 detects the further concrete detailed theory diagram of end-of-life circuit automatically for creepage protecting socket electrifying of the present invention.As shown in the figure, main circuit U1 comprises leakage current detection circuit (differential differentiating transformer L1, L2, leakage current are judged chip IC 1 etc.) and drives the circuit that reset button moves (controllable silicon V23, be built-in with the solenoid L3 of iron core etc.) two parts.When having leakage current in the earth leakage protective socket feed circuit; if earth leakage protective socket does not have end-of-life; still has creepage protection function; then the chip IC in the leakage current detection circuit 1 can be exported control signal, makes the controllable silicon V23 conducting in the circuit that drives the reset button action, and making in the solenoid L3 has electric current to flow through; produce magnetic field; its built-in iron core action is threaded off reset button, cuts off the power supply output of earth leakage protective socket.If current leakage jack life termination; can not produce feedback signal, perhaps feedback signal can't be delivered to analog detection feedback circuit U4, also just cannot trigger U6 output resetting voltage; thereby reset button can not be resetted all the time, cut off the power supply output of earth leakage protective socket.Simultaneously, life terminating detection judging circuit U6 ceaselessly exports control signal and makes the U2 conducting that ceaselessly is triggered, thereby impels its fault display circuit pilot lamp Chang Liang: red led V10 Chang Liang tells this earth leakage protective socket of user end-of-life.
Simulate leakage current generating circuit U 2 mainly by rectifier bridge V6～V9, one-way SCR V12, elements such as transformer L4 are formed.The pin 3 of the chip IC 2 of the former limit winding of transformer L4 in on-off element and life terminating detection judging circuit U6 links to each other, the output terminal of the secondary winding of transformer L4 extremely links to each other with the control of one-way SCR V12, the anode of controllable silicon V12, negative electrode link to each other with the dc voltage output end of rectifier bridge V6～V9 respectively, and the ac power input end of rectifier bridge V6～V9 links to each other with the zero line of power firestreak that passes differential differentiating transformer L1, L2 and power input respectively.After earth leakage protective socket powers on; the pin 3 of the chip IC 2 among the life terminating detection judging circuit U6 is exported high level automatically because of the closure of reset mode K switch R1; making in the transformer L4 has electric current to flow through; trigger controllable silicon V12 conducting; there is electric current to flow through in rectifier bridge V6～V9; with output terminal live wire and input end zero line short circuit, produce the simulation leakage current.When the pin 3 of chip IC 2 was low level, no current flow through in the transformer L4, and controllable silicon V12 ends, and rectifier bridge V6～V9 does not work, and does not simulate leakage current generating.
Reset button state identification circuit U3 mainly is made of the K switch R1 with the reset button interlock, as shown in Figure 3, it is made up of fixed mount 101, two spring leafs 102,103, one of them spring leaf 102 links to each other by the pin 2 of the chip IC 2 among resistance R 7, capacitor C 1 and the life terminating detection judging circuit U6, and another spring leaf 101 links to each other with zero-power line.When reset button was in tripped condition, the spring leaf 102 of K switch R1 contacted conducting with spring leaf 103 under the effect on the inclined-plane of reset button side; When reset button was in reset mode, because the inclined-plane of reset button side moves down, spring leaf 102 resiled, and separates with spring leaf 103, is in not on-state.Be mainly used in the state that detects reset button with the K switch R1 of reset button interlock, (also characterize earth leakage protective socket and be in reset mode: operate as normal or end-of-life/trip status; Normal standby or the fault duty of dying of old age) and with its state logic voltage signal be transferred to chip IC 2 among the life terminating detection judging circuit U6, judge whether end-of-life use of earth leakage protective socket for it.
Analog detection feedback circuit U4 mainly drives diode V22 in the reset button actuating circuit, resistance R 14 etc. and constitutes by being connected on main circuit, the pin 5 of the chip IC 2 among its signal output part and the life terminating detection judging circuit U6 links to each other, the least significant end that flows to from circuit signal can directly reflect good Yu the bad state of work of main circuit U1, particularly its end-of-life whether.
Resetting voltage output circuit U5 mainly is made of the reset trigger power condition switch KR4 with the reset button interlock, as shown in Figure 3, it is made of two spring leafs 67,68, the pin 5 that leakage current among one of them spring leaf 67 and the main circuit U1 detects control chip IC1 links to each other, and another spring leaf 68 links to each other by the pin 1 of the chip IC 2 among resistance and the life terminating detection judging circuit U6.This power condition switch KR4 and reset button interlock.When reset button RESET is pressed, power condition switch KR4 closure, when reset button RESET was released, power condition switch KR4 disconnected.
Life terminating detection judging circuit U6 mainly latchs flip chip IC2 and constitutes by putting count/to reset, negative edge signal when forwarding low level to by high level of its pin two input behind this chip power starts test automatically, and the automatic output control signal makes simulation leakage current generating circuit U 2 produce the simulation leakage currents; By analog detection feedback circuit U4 have/no feedback signal (being produced by U1) gives U6, impels U6 output/do not export resetting voltage, sets up correct reset mechanism, make/or stop reset button to reset; Simultaneously, this chip IC 2 is also exported control signal and is given status display circuit U2, and U8 shows the state of earth leakage protective socket in real time.1 pin that putting count/resets latchs flip chip IC2 is the resetting voltage output terminal, and it links to each other with status display circuit U8 with resetting voltage output circuit U5, for U5 provides resetting voltage, for the normal condition pilot lamp of U8 provides driving voltage; 2 pin of IC2 are for starting test input, link to each other with U3, U7 unit, when the K switch T closure (being that manual test button TEST is in the state of being pressed) of the K switch R1 of U3 unit closure (being that reset button is in trip status) or U7 unit, can start chip IC 2 and move; 3 pin of IC2 are simulation leakage current generating control end, it link to each other with simulation leakage current generating circuit U 2 (the malfunction pilot lamp in the display circuit seals in the loop, is a branch road of circuit U 2) driving voltage of automatic leakage current generation and malfunction pilot lamp display circuit is provided; 5 pin of IC2 are simulation test feedback signal input end; it links to each other with the U4 unit; having/not having of feedback signal directly characterized the whether intact of socket creepage protection function; if U4 has signal feedback to show that the earth leakage protective socket function is intact for 5 pin of IC2, if 5 pin that U4 does not have the analog detection feedback signal to pass to IC2 then are the creepage protection function end-of-life.
Manual test circuit U 7 mainly by with the K switch T of manual test button TEST interlock and the resistance R 1 that is used to produce leakage current constitute, after K switch T and resistance R 1 series connection, pass differential differentiating transformer L1, L2 after one end and the K switch R2-1 series connection and link to each other with power firestreak, the other end links to each other with zero-power line and forms the closed manual leakage current path of simulating.Only be power switch KR2 after reset button resets, could move after the KR3 closure.
Status display circuit U8 mainly by normal condition pilot lamp V17 and control pilot lamp bright/control circuit that goes out constitutes.The resetting voltage output terminal (1 pin of IC2) of the chip IC 2 among normal condition pilot lamp V17 and control circuit thereof and the life terminating detection judging circuit U6 links to each other; Normal condition display part for the state demonstration.
Fig. 4 is a specific embodiment of the invention circuit diagram.This physical circuit figure and Fig. 1, schematic block circuit diagram shown in Figure 2 are corresponding.Core of the present invention is that putting among the life terminating detection judging circuit U6 count/resets and latch flip chip IC2 (model ZQC-051208T or ZQC-051208H).
Fig. 5, Fig. 6 latch the inner concrete wiring diagram of flip chip IC2 for putting count/to reset.Chip IC 2 is 8 pin chips, wherein:
Pin one is resetting voltage output terminal UOK, is high level during the output resetting voltage, is low level when not exporting resetting voltage;
Pin two when this port is transfused to the low level negative edge, can start the end-of-life test process for resetting/trip status input end IQ1, and promptly pin 3 can be reversed and be high level, and pin one can be reversed and be low level simultaneously;
Pin 3 is simulation leakage current generating control end UQC, during this pin output high level, can impel to produce the simulation leakage current;
Pin 5 is simulation test feedback signal input end IF: when being transfused to negative pulse, show that earth leakage protective socket tests by end-of-life, can operate as normal, and make pin 3 be reversed and be low level, make the pin one upset be high level simultaneously.
Pin 6 is that the chip operation power supply is with reference to earth terminal GND
Pin 7 is for starting the standby end IQ2 of checkout
Pin 8 is imported standby end V for power supply
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Shown in Figure 5 put count/to reset latch flip chip IC2 (ZQC-051208T) internal transistor V1, V2 and resistance R 1, R2, R3, R4 and form and trigger latch; Transistor V3, resistance R 12, R13 and capacitor C 5 are formed the feedback signal input utmost point; Transistor V4, resistance R 10, R11 and capacitor C 4 are inverter circuit; Transistor V5, resistance R 5, R6 form emitter follower; Transistor V6, resistance R 7, R8 form the qualified follower of detection; Capacitor C 2, resistance R 9 are formed startup test input circuit; Transistor V7, resistance R 14, R15 form standby startup test input circuit, and V8, V9 form standby power circuit.
As Fig. 1; Fig. 2; Fig. 4; shown in Figure 5; power input LIN when earth leakage protective socket; power firestreak in NIN and the wall; after zero line connects; earth leakage protective socket powers on; this moment, earth leakage protective socket was in trip status; KR1 among the reset button state identification circuit U3 is in closure state; U3 can send 2 pin of a state recognition signal to IC2 among the U6; the triode V1 of IC2 inside enters state of saturation immediately; the V1 current collection is low level very; V2 is in cut-off state; the V2 collector is put high level; V5 in the emitter follower exports high level by current-limiting resistance R6 on 3 pin of IC2; 3 pin are exported this high level signal at once and are given U2; drive U2 and produce a simulation leakage current automatically; this simulation leakage current at first arrives U1; if the earth leakage protective socket function is intact; main circuit U1 can detect this simulation leakage current; thereby the output control signal makes the controllable silicon V23 conducting in the circuit that drives the reset button action; the anode of controllable silicon V23 produces a low level Continuity signal; this signal is through the V22 among the analog detection feedback circuit U4; R14 feeds back to 5 pin of chip IC 2 (ZQC-051208T); and be added to the base stage of detection feedback transistor V3; signal is input to transistor V4 in the phase inverter through R10 again; through inverter trigger; the utmost point in the short time V1 and V2 state turnover be: V1 ends; V2 is from saturated by entering; the V2 collector is changed to low level; and the V1 collector is high level at this moment, and by detecting qualified follower R7; V6; R8 is from high level U of 1 pin output of IC2
OK. this Uok is added to U5, U8.This high level Uok makes that the end in the KR4 two ends has high level by current-limiting resistance R10 among the U5; the other end links to each other with the control utmost point G of controllable silicon V23; thereby the reset mode for the treatment of that this earth leakage protective socket is in normally to be resetted; 3 pin of IC2 forward low level state to simultaneously, make U2 stop to produce the simulation leakage current.At this moment press the RESET key, product can be reset, and the pilot lamp V17 of indication product energy operate as normal among the U8 is lighted.State-detection K switch R1 is disconnected by interlock simultaneously.
If the main key components in the earth leakage protective socket has been damaged in other words end-of-life, so Shang Mian a series of automatic testing process just can not be done.Chip IC 2 (ZQC-051208T) just is locked in the startup test mode always; 1 pin of IC2 is in low level state all the time; there is not signal to output to U5; thereby make this earth leakage protective socket be in the state that can not be reset; 3 pin of IC2 have high level to output to U2 always simultaneously, and go driving to light malfunction pilot lamp V10 with this high level.Remind the timely replacing of user to arrive the earth leakage protective socket of end-of-life.
If the earth leakage protective socket function is intact, the back is working properly resetting.When having leakage current in the circuit; magnetic test coil L1; L2 can induce the vector of voltage and non-vanishing immediately; and transmit signal and detect the signal input part 1 and 2 of control chip IC1 to leakage current, 5 pin of chip IC 1 can be exported the gate pole that control signal is given controllable silicon V23 immediately, make that controllable silicon V23 is triggered, conducting; thereby the tripping coil L3 (SOL) in the trip gear is got; its inner iron core is done ballistic motion, and reset button is threaded off, and cuts off the output of earth leakage protective socket power supply.This moment is because the dropout of reset button; K switch R1 closure among the U3 of feasible interlock with it; cause and again earth leakage protective socket is detected; if the earth leakage protective socket function is intact; 1 pin of life terminating detection judging chip IC 2 becomes high level among the U6; this high level makes that the end of KR4 has high level by current-limiting resistance R10 among the U5; thereby make this earth leakage protective socket be in the state that can be reset; after pressing reset button RESET key; earth leakage protective socket is reset; make the controllable silicon V18 conducting among the U8 simultaneously, normal condition pilot lamp V17 lights.
The present invention except have connect with the mains after; automatically produce simulation leakage current detection earth leakage protective socket and whether still have creepage protection function; whether outside the end-of-life; can also produce the simulation leakage current by the testing button of manually pushing among the U7 (TEST key); carry out customary earth leakage protective socket functional test, the earth leakage protective socket tripping operation is threaded off.
If earth leakage protective socket is working properly in the back that resets, the earth leakage protection performance is intact.This moment is when pressing testing button (TEST key), can produce the simulation leakage current from two kinds of different approaches: the K switch T closure of the first and the interlock of TEST button, thereby produce the simulation leakage current, magnetic test coil L1, after L2 detects leakage current, output voltage signal detects the signal input part 1 and 2 of control chip IC1 to leakage current, 5 pin of chip IC 1 are exported the gate pole that control signal is given controllable silicon V23 at once, controllable silicon V23 is triggered, conducting, thereby the tripping coil L3 (SOL) in the trip gear is got, its inner iron core is done ballistic motion, reset button is threaded off, cut off the output of earth leakage protective socket power supply; It two is after pressing the TEST button; this moment IC2 2 pin to be transfused to a high level saltus step be low level negative edge signal; thereby cause V1 in the IC2 sheet; the V2 upset is given U2 for high level signal of 3 pin output of putting number: IC2; the driving circuit of U2 is changed the back at once and is produced a simulation leakage current; on the simulation leakage current that this simulation leakage current produces when being added to hand switch KT closure; L1; after L2 detects this simulation leakage current; L1; L2 passes to the signal input part 1 and 2 that leakage current detects control chip IC1 with this leakage current signal with the output voltage signal form; chip IC 1 through amplification ratio after; 5 pin of chip IC 1 are exported the gate pole that control signal is given controllable silicon V23 at once; controllable silicon V23 is triggered; conducting; thereby the tripping coil L3 (SOL) in the trip gear is got; its inner iron core is done ballistic motion; reset button is threaded off, cut off the output of earth leakage protective socket power supply.If earth leakage protective socket is destroyed at the back end-of-life that resets/main key components; at this moment when manually pressing testing button TEST key; K switch T closure with the interlock of TEST button; but for the simulation leakage current that is produced; the response of threading off does not take place in trip gear; and this moment, high level signal was sealed the door of 2 pin of IC2 all the time; 1 pin of IC2 can't be overturn be high level state; and 3 pin are exported a high level signal all the time to U2; it is that trouble light shows electric current that driving U2 ceaselessly produces a simulation leakage current automatically; because current leakage jack life termination; U4 just detects less than normal trip signal; also just the dropout undersuing can not be passed; 5 pin of modular circuit IC2 also just can not receive proper feedback signal, cause 1 pin of IC2 can only be placed in low level state, thereby operate as normal pilot lamp V17 is extinguished; this moment, 3 pin of IC2 were then continued to be locked in high level state, thereby drove red light emitting diodes V10 (LED
1) oneself lost efficacy to continue luminous this socket of demonstration.
Because the present invention adopts above design proposal, makes the present invention have following distinguishing feature:
1, power firestreak in the present invention and wall, after zero line is connected, need not to operate any parts can detect by automatic creepage protection function to earth leakage protective socket: if earth leakage protective socket major critical component function is normal, earth leakage protective socket can be set up correct reset mechanism automatically, the present invention is in treats reset mode, when pressing reset button RESET key, tripping mechanism of the present invention can be reset immediately, connect electric power during release-push RESET key, resetting power supply back normal operating conditions pilot lamp green LED V17 (LED2) will Chang Liang, and the earth leakage protective socket operate as normal is described; If the main key components of earth leakage protective socket lost efficacy; it is end-of-life; then end-of-life/malfunction pilot lamp red light emitting diodes V10:LED1 will be luminous; even at this moment push reset button RESET key; earth leakage protective socket also can't be reset; make the load output terminal of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output; avoid when leaky occurring because of earth leakage protective socket end-of-life or its main key components cisco unity malfunction that breaks down, the generation of dead accident but its user who still has power supply output to cause gets an electric shock.
2, in each routine inspection of earth leakage protective socket of the present invention after normally resetting; when the user presses the TEST key: if this product creepage protection function lost efficacy; be that the main key components of earth leakage protective socket breaks down and the creepage protection function that causes lost efficacy; the normal condition pilot lamp will extinguish, and end-of-life/malfunction pilot lamp is lighted.Thereby inform the user, this earth leakage protective socket has lost creepage protection function, answers powered-down to change this earth leakage protective socket; If the earth leakage protective socket inner member is intact, function is normal, and after pushing the TEST key, earth leakage protective socket can be made the load output terminal of earth leakage protective socket and the single-phase three-wire power supply output plughole of receptacle face all not have power supply output by the tripping operation of threading off.Therefore product has been in the dropout holding state the time again, and the normal condition pilot lamp extinguishes.Moment after the tripping operation of threading off; whether the present invention still has creepage protection function to earth leakage protective socket again automatically, and promptly whether end-of-life detects; detect qualified after; automatically set up correct reset mechanism; the present invention is in treats reset mode; when pressing reset button RESET key, the present invention's energising that just can be reset again, the normal condition pilot lamp is lighted simultaneously.The user can operate the TEST button and finish customary product function check.Performance of the present invention is good, and is safe and reliable, can effectively reduce the generation of the dead accident of getting an electric shock.
3. the present invention has leakage current generating when the normal operating conditions that is reset, and touches the socket output plughole because of carelessness such as the user; this earth leakage protective socket can induce leakage current; impel earth leakage protective socket to thread off and trip, cut off the electricity supply, can effectively reduce the generation of the dead accident of getting an electric shock.
The above is a specific embodiment of the present invention only, and protection scope of the present invention is not limited thereto, and anyly all belongs to protection scope of the present invention based on the equivalent transformation on the circuit of the present invention.
Claims (6)
1. whether a creepage protecting socket electrifying detects the end-of-life circuit automatically, and it is characterized in that: it is by main circuit (U1), simulation leakage current generating circuit (U2), reset button state identification circuit (U3), analog detection feedback circuit (U4), resetting voltage output circuit (U5), life terminating detection judging circuit (U6), manual test circuit (U7) and status display circuit (U8) formation;
Main circuit (U1) mainly is to detect in the current supply circuit whether have leakage current, and the output control signal resets reset button or threads off;
Simulation leakage current generating circuit (U2) mainly is behind the power connection in earth leakage protective socket and wall, to need not to operate any assembly and produce the simulation leakage current automatically, and when current leakage jack life termination, demonstration fail operation state; Reset button state identification circuit (U3) mainly is the state of identification reset button, and gives life terminating detection judging circuit (U6) with detected reset button state transfer;
Analog detection feedback circuit (U4) mainly is to detect earth leakage protective socket main circuit (U1) whether still to have creepage protection function, and gives life terminating detection judging circuit (U6) with detected result transmission;
Resetting voltage output circuit (U5) mainly is to provide operating voltage for circuit that the driving reset button in the main circuit (U1) resets;
The major function of life terminating detection judging circuit (U6) is: after earth leakage protective socket powered on, the automatic output control signal made simulation leakage current generating circuit (U2) produce the simulation leakage current; According to the testing result of analog detection feedback circuit (U4), judge whether earth leakage protective socket has creepage protection function, i.e. end-of-life whether, and show judged result by status display circuit (U8);
Manual test circuit (U7) mainly is manually to produce the simulation leakage current;
Status display circuit (U8) mainly is to show the earth leakage protective socket normal operating conditions;
More than the annexation of each ingredient be:
The power input of main circuit (U1) links to each other with power firestreak, zero line in the wall, and its power output end is power firestreak, the zero line of earth leakage protective socket output;
The signal input part of analog detection feedback circuit (U4) links to each other with the circuit that the driving reset button in the main circuit (U1) is moved, and its signal output part links to each other with the signal input part of life terminating detection judging circuit (U6);
The signal output part of reset button state identification circuit (U3) links to each other with another signal input part of life terminating detection judging circuit (U6);
The signal output part of manual test circuit (U7) links to each other with the another signal input part of life terminating detection judging circuit (U6);
A signal output part of life terminating detection judging circuit (U6) links to each other with the control end of simulation leakage current generating circuit (U2), and whether control simulation leakage current generating circuit (U2) produces leakage current; Another signal output part of life terminating detection judging circuit (U6) links to each other with the control end of resetting voltage output circuit (U5), the circuit that resets for the driving reset button in the main circuit (U1) provides operating voltage, thereby sets up the mechanism of reset button proper reset; The another signal output part of life terminating detection judging circuit (U6) links to each other with status display circuit (U8), shows the power supply and the failure state of earth leakage protective socket.
2. whether a kind of creepage protecting socket electrifying according to claim 1 detects the end-of-life circuit automatically, it is characterized in that:
Described life terminating detection judging circuit (U6) latchs flip chip (IC2) formation by putting count/to reset, 1 pin that putting count/resets latchs flip chip (IC2) is the resetting voltage output terminal, it links to each other with status display circuit (U8) with resetting voltage output circuit (U5), (U5) provides resetting voltage for the resetting voltage output circuit, for the normal condition pilot lamp of status display circuit (U8) provides driving voltage; Its 2 pin links to each other with reset button state identification circuit (U3), manual test circuit (U7) for starting test input; Its 3 pin is simulation leakage current generating control end, and it links to each other with simulation leakage current generating circuit (U2), and the driving voltage of automatic leakage current generation and malfunction pilot lamp display circuit is provided; Its 5 pin is a simulation test feedback signal input end, and (U4) links to each other with the analog detection feedback circuit, accepts the detection of the earth leakage protective socket key components failure effect creepage protection function of feedback.
3. whether a kind of creepage protecting socket electrifying according to claim 2 detects the end-of-life circuit automatically, it is characterized in that:
Described simulation leakage current generating circuit (U2) is by rectifier bridge, one-way SCR, and transformer is formed; The former limit winding of transformer links to each other with the pin 3 that latchs flip chip (IC2) that count/resets of putting in the described life terminating detection judging circuit (U6) through on-off element, the output terminal of the secondary winding of transformer extremely links to each other with the control of one-way SCR, silicon controlled anode, negative electrode link to each other with the dc voltage output end of rectifier bridge respectively, and the ac power input end of rectifier bridge links to each other with the zero line of power firestreak that passes differential differentiating transformer and power input respectively.
4. whether a kind of creepage protecting socket electrifying according to claim 3 detects the end-of-life circuit automatically, it is characterized in that:
Described reset button state identification circuit (U3) is made of the switch (KR1) with the reset button interlock; Switch (KR1) is made up of fixed mount, two spring leafs, and one of them spring leaf links to each other with the pin 2 that latchs flip chip (IC2) that count/resets of putting in the life terminating detection judging circuit (U6) by resistance, electric capacity, and another spring leaf links to each other with zero-power line.
5. whether a kind of creepage protecting socket electrifying according to claim 4 detects the end-of-life circuit automatically, it is characterized in that:
Described resetting voltage output circuit (U5) is made of the reset trigger power condition switch (KR4) with the reset button interlock, power condition switch (KR4) is made of two spring leafs, the pin 5 that leakage current in one of them spring leaf and the main circuit detects control chip links to each other, and another spring leaf links to each other with the pin 1 that latchs flip chip (IC2) that count/resets of putting in the life terminating detection judging circuit (U6) by resistance.
6. whether a kind of creepage protecting socket electrifying according to claim 5 detects the end-of-life circuit automatically, it is characterized in that:
Described manual test circuit (U7) is by with the switch (KT) of manual test button interlock be used to produce the resistance formation of leakage current, after switch (KT) and the resistance series connection, one end links to each other with the power firestreak that passes differential differentiating transformer, and the other end links to each other with zero-power line and forms closed manually simulation leakage current path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610088904XA CN101113998B (en) | 2006-07-25 | 2006-07-25 | Circuit for automatically detecting creepage protecting socket electrifying whether or not end of life |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610088904XA CN101113998B (en) | 2006-07-25 | 2006-07-25 | Circuit for automatically detecting creepage protecting socket electrifying whether or not end of life |
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| CN101113998A CN101113998A (en) | 2008-01-30 |
| CN101113998B true CN101113998B (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610088904XA Expired - Fee Related CN101113998B (en) | 2006-07-25 | 2006-07-25 | Circuit for automatically detecting creepage protecting socket electrifying whether or not end of life |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887765B (en) * | 2014-03-25 | 2017-01-18 | 温州市万盛电器有限公司 | Electric leakage detection protection circuit with discrete component timing self-detection function |
| CN105449627B (en) * | 2014-08-18 | 2019-02-01 | 施耐德电气工业公司 | Earth leakage protective device and its method |
| CN104795789B (en) * | 2015-03-20 | 2017-07-28 | 张家港市佰瑞普电器科技有限公司 | A kind of automatic monitoring circuit of earth fault earth leakage protective device |
| CN107132449B (en) * | 2017-06-20 | 2023-03-24 | 漳州市玉山电子制造有限公司 | Socket test circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2193601Y (en) * | 1994-05-20 | 1995-03-29 | 上海立新电器厂 | Current leakage protecting socket |
| CN2439127Y (en) * | 2000-09-04 | 2001-07-11 | 黄华道 | Leakage protection socket |
| CN2930044Y (en) * | 2006-07-25 | 2007-08-01 | 黄华道 | Automatically detecting if life terminal circuit for leakage protective socket |
-
2006
- 2006-07-25 CN CN200610088904XA patent/CN101113998B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2193601Y (en) * | 1994-05-20 | 1995-03-29 | 上海立新电器厂 | Current leakage protecting socket |
| CN2439127Y (en) * | 2000-09-04 | 2001-07-11 | 黄华道 | Leakage protection socket |
| CN2930044Y (en) * | 2006-07-25 | 2007-08-01 | 黄华道 | Automatically detecting if life terminal circuit for leakage protective socket |
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| CN101113998A (en) | 2008-01-30 |
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