CN100517896C - Steering circuit for earthing fault breaker - Google Patents
Steering circuit for earthing fault breaker Download PDFInfo
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- CN100517896C CN100517896C CNB2006101258355A CN200610125835A CN100517896C CN 100517896 C CN100517896 C CN 100517896C CN B2006101258355 A CNB2006101258355 A CN B2006101258355A CN 200610125835 A CN200610125835 A CN 200610125835A CN 100517896 C CN100517896 C CN 100517896C
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Abstract
The invention is an earth fault breaker control circuit, comprising: load connecting circuit for connecting supply end with load end and transmitting AC, leakage detection circuit, release control circuit and release circuit, and also comprising: self-examination current generating circuit, self-examination display circuit and first switch tube, when the input AC is at positive semicircle, one of the release circuit and the self-examination circuit is switched on, and when the input AC is at negative semicircle, the other one of them is switched on, therefore it can self-examine whether the control circuit has leakage protection function without artificial providing simulation signals, thus feeding back working conditions of the breaker in use in time.
Description
Technical field
The present invention relates generally to a kind of control circuit of leak current fault protective device, relates in particular to a kind of control circuit of ground-fault interrupter.
Background technology
The leak current fault protective device can prevent effectively that the person from getting an electric shock and fire incident, especially ground-fault interrupter, not only has creepage protection function, can also have the neutral ground failure protection function, thereby be subjected to extensive use.
Because leak current fault protective device self also might break down, and as the termination in useful life of inner components and parts, causes the forfeiture of creepage protection function, in this case, get an electric shock or fire incident if continue to use this device the person just might occur.
For this reason; the production firm of some ground-fault interrupter begins to design and develop the earth fault controller controling circuit with autodiagnosis function; thereby whether the earth leakage protective device in the diagnosis control circuit is intact, whether still have creepage protection function; as the patent No. is US6; 952; 150 United States Patent (USP), it has the autodiagnosis circuit of indicating circuit breaker life termination.Yet, because this autodiagnosis circuit is coupling in the test circuit, need manually provide simulate signal, can not automatic diagnosis, thereby can not in time reflect and the fine or not situation of the circuit breaker in the use really do not play the autodiagnosis function.
In addition, because autodiagnosis circuit itself also might break down, cause the forfeiture of autodiagnosis function as the termination in inner components and parts useful life.In this case, might occur that creepage protection function is lost and the autodiagnosis circuit still shows the situation with creepage protection function.If continuing to use this device the person just might occur gets an electric shock or fire incident.
Summary of the invention
The invention provides a kind of control circuit of ground-fault interrupter, its need not manually to provide simulate signal voluntarily the diagnosis control circuit whether have creepage protection function, the fine or not situation of the circuit breaker during in time feedback is used.
For achieving the above object, technical scheme of the present invention is, a kind of control circuit of ground-fault interrupter, and it has creepage protection function, and it comprises the load connecting circuit, is used to connect power end Line and load end Load and transmits alternating current; Electric-leakage detection circuit comprises magnetic test coil N1, and magnetic test coil N1 is used for converting the magnetic flux change amount by wherein to induced potential output, and the lead of described load connecting circuit passes described magnetic test coil N1; Trip circuit comprises tripping coil J, and described tripping coil J is used for electric current is converted into electromagnetic force; The dropout control circuit, described dropout control circuit is connected electrically between electric-leakage detection circuit and the tripping coil J, described dropout control circuit is used for the signal of telecommunication and a preset value of input are compared, when the signal of telecommunication of input during greater than described preset value, the output of described dropout control circuit output significant level; The control circuit of described ground-fault interrupter also comprises the autodiagnosis current generating circuit, and the lead that at least one end of described autodiagnosis current generating circuit is coupled to described load connecting circuit and autodiagnosis current generating circuit passes from described magnetic test coil N1; The autodiagnosis display circuit is used to show whether creepage protection function is intact; First switching tube, described first switching tube has the control end of at least two links and the described link turn-on and turn-off of control, described first control end of switching tube is coupled to the output of described dropout control circuit, and described trip circuit and autodiagnosis display circuit are connected to the link of first switching tube respectively; When the alternating current of described input is in positive half cycle, a conducting in described trip circuit and the autodiagnosis display circuit, when the alternating current of described input is in negative half period, another conducting in described trip circuit and the autodiagnosis display circuit.
The control circuit of described ground-fault interrupter comprises also and is used for finishing the autodiagnosis termination circuit that shows back disconnection autodiagnosis display circuit at the autodiagnosis display circuit that described autodiagnosis termination circuit comprises triode Q.
Described autodiagnosis display circuit comprises optocoupler OC, the output of described optocoupler OC is connected with second switch pipe SCR2, described second switch pipe SCR2 has the control end of at least two links and the described link turn-on and turn-off of control, and the control end of described second switch pipe SCR2 is coupled to the output of optocoupler OC.
The control circuit of described ground-fault interrupter also comprises end life indicating circuit, and described end life indicating circuit is connected between two links of second switch pipe SCR2.
Described triode Q has base stage, and the base stage of described triode Q is coupled to the link of described second switch pipe SCR2, another link ground connection of second switch pipe SCR2.
Described autodiagnosis current generating circuit comprises diode D6 and resistance R 9, described triode Q also has collector and emitter, serial connection back one end is connected to the load connecting circuit between described diode D6 and the resistance R 9, and the other end is connected to collector electrode or the emitter of triode Q.
Described autodiagnosis display circuit comprises resistance R 6, capacitor C 8, diode D7 and optocoupler OC, be connected electrically between two links of described first switching tube after described resistance R 6, capacitor C 8, the diode D7 serial connection, described optocoupler OC is connected in parallel on the two ends of diode D7 again.
Be electrically connected with diode D6 in the described trip circuit.
Described end life indicating circuit comprises resistance R 10 and LED 1, be connected electrically in again between two links of described second switch pipe SCR2 after the serial connection between described LED 1 and the resistance R 10, also be parallel with capacitor C 7 between two links of described second switch pipe SCR2.
Technical scheme of the present invention compared with prior art, its advantage is as follows:
1, owing to has the autodiagnosis current generating circuit in its control circuit, the autodiagnosis current generating circuit extracts certain electric current as the human failure electric current automatically from the load connecting circuit when the alternating current of input is on positive half cycle or the negative half period any, put on the magnetic test coil N1, therefore need not manually to provide simulate signal can carry out autodiagnosis voluntarily;
2, owing to have the autodiagnosis termination circuit in its control circuit, therefore as long as the optocoupler OC in the autodiagnosis display circuit is luminous, the electric current of optocoupler OC output promptly can conducting second switch pipe SCR2, making has not had bias voltage on the base stage of triode Q, cause the triode Q of conducting state to turn-off, the autodiagnosis circuit quits work, to the next cycle of alternating current, the autodiagnosis display circuit begins to repeat automatically work again, like this in the one-period of alternating current, the control circuit of ground-fault interrupter only autodiagnosis once, the big power consumption of avoiding the work that repeats to cause;
3; owing to have end life indicating circuit in its control circuit; therefore work as in the control circuit because device aging; reasons such as puncture cause earth leakage protective to lose efficacy; when perhaps autodiagnosis display circuit itself is out of joint; optocoupler in the autodiagnosis display circuit is just not luminous; thereby its output does not have electric current output; just can conducting second switch pipe SCR2 yet; originally on the end life indicating circuit of second switch pipe SCR2 short circuit voltage drop has been arranged; cause LED 1 luminous; promptly show; the control circuit of this ground-fault interrupter is aging malfunctioning, must change as early as possible, has further protected user's Electrical Safety.
Description of drawings
Accompanying drawing 1 is the circuit diagram one of the control circuit of ground-fault interrupter of the present invention;
Accompanying drawing 2 is the circuit diagram two of the control circuit of ground-fault interrupter of the present invention;
Accompanying drawing 3 is the circuit diagram three of the control circuit of ground-fault interrupter of the present invention;
Accompanying drawing 4 is the circuit diagram four of the control circuit of ground-fault interrupter of the present invention;
Accompanying drawing 6 is the block schematic diagram of the control circuit of ground-fault interrupter of the present invention.
Embodiment
Be the block schematic diagram of the control circuit of ground-fault interrupter of the present invention as shown in Figure 6.It comprises load connecting circuit 20, is used to connect power end Line and load end Load and transmits alternating current; Electric-leakage detection circuit 15 comprises magnetic test coil N1, and magnetic test coil N1 is used for converting the magnetic flux change amount by wherein to induced potential output, and the lead of described load connecting circuit 20 passes described magnetic test coil N1; Dropout control circuit 16, described dropout control circuit 16 is electrically connected to electric-leakage detection circuit 15, described dropout control circuit 16 is used for the signal of telecommunication and a preset value of input are compared, when the signal of telecommunication of input during greater than described preset value, the output of described dropout control circuit 16 output significant level; Trip circuit 23 comprises tripping coil J, and described tripping coil J is connected to dropout control circuit 16 and electric current is converted into electromagnetic force; The lead that autodiagnosis current generating circuit 21, at least one end of described autodiagnosis current generating circuit 21 are coupled to described load connecting circuit 20 and autodiagnosis current generating circuit 21 passes from described magnetic test coil N1; Autodiagnosis display circuit 17 is used to show whether creepage protection function is intact; First switching tube 22, described first switching tube 22 has the control end of at least two links and the described link turn-on and turn-off of control, the control end of described first switching tube 22 is coupled to the output of described dropout control circuit 16, and described trip circuit 23 and autodiagnosis display circuit 17 are connected to the link of first switching tube 22 respectively; When the alternating current of described input is in positive half cycle, a conducting in described trip circuit 23 and the autodiagnosis display circuit 17, when the alternating current of described input is in negative half period, another conducting in described trip circuit 23 and the autodiagnosis display circuit 17.In the present embodiment, first switching tube 22 is a controllable silicon SCR 1.
The control circuit of described ground-fault interrupter can also comprise and be used for finishing the autodiagnosis termination circuit 18 that shows back disconnection autodiagnosis display circuit 17 at autodiagnosis display circuit 17.
The control circuit of described ground-fault interrupter can also comprise end life indicating circuit 19, if autodiagnosis display circuit 17 breaks down or creepage protection function is malfunctioning, described end life indicating circuit 19 is promptly luminous.
As accompanying drawing 1 to shown in the accompanying drawing 5, magnetic test coil N1, capacitor C 0, capacitor C 1, resistance R 3 etc. constitute an electric-leakage detection circuit 15, two leads of load connecting circuit 20 pass described magnetic test coil N1, the output shunt capacitance C0 of magnetic test coil N1, one end series capacitance C1, the C1 other end is connected in series with resistance R 3.
Integrated amplification chip IC, resistance R 1, capacitor C 4 constitutes dropout control circuit 16.Integrated amplification chip IC is the integrated amplification chip of ground-fault interrupter special use, and this sentences RV4145 and illustrates.The other end of R3 is connected with input 1 pin of integrated amplification chip IC, and another input 3 pin of the other end of magnetic test coil N1 and integrated amplification chip IC connect and compose transformer coupled differential input circuit.Wherein, R1 is a feedback resistance, and the one end is connected with integrated amplification chip IC pin 1, and the other end is connected with integrated amplification chip IC output 7 pin, R1 resistance size determines integrated amplification chip IC multiplication factor, promptly determines the size of ground-fault interrupter dropout action failure current value.Trigger end 5 pin of the integrated amplification chip IC of integrated amplification chip connect the control utmost point of controllable silicon SCR 1, and anti-interference capacitor C4 is connected in parallel between the controllable silicon SCR 1 control utmost point and the ground.
Trip circuit 23 comprises tripping coil J and diode D6.The anode of controllable silicon SCR 1 connects the end of tripping coil J, the other end of tripping coil J is connected controllable silicon SCR 1 minus earth by diode D6 with the power end Line of ground-fault interrupter.
When load connecting circuit 20 is carried out the earth leakage protective detection; the variation that magnetic test coil N1 detects the magnetic flux wherein pass through also is converted to induced potential, and current phasor and be zero during the fault-free electric current at ordinary times is when fault current; this vector and non-vanishing, the variation that promptly produces magnetic flux.Magnetic test coil N1 will induce the correspondent voltage signal, this signal amplifies through integrated amplification chip IC, when this signal reaches the setting threshold values of being determined by resistance R 1, the trigger end 5 pin output triggering signal of integrated amplification chip IC, make controllable silicon SCR 1 conducting, tripping coil J is charged and electric current is converted into electromagnetic force, attracts release to thread off at the appointed time, and ground-fault interrupter disconnects.
Autodiagnosis current generating circuit 21 comprises diode D8 and resistance R 9.Resistance R 6, capacitor C 8, diode D7, optocoupler OC constitute autodiagnosis display circuit 17.Triode Q, resistance R 8 constitute autodiagnosis termination circuit 18.Be series connection between diode D8 in the autodiagnosis current generating circuit 21 and the resistance R 9, and the one end passes magnetic test coil N1, the other end of diode D8 links to each other with lead in the load connecting circuit 20, the other end of R9 links to each other with triode Q collector electrode, the grounded emitter of triode Q, the base stage of triode Q links to each other with resistance R 8, the collector electrode of the output of the other end of R8 and optocoupler OC, the anode of controllable silicon SCR 2 and capacitor C 7, one end of resistance R 10 links to each other, the emitter of optocoupler OC extremely links to each other with the control of controllable silicon SCR 2, the input of optocoupler OC also meets a diode D7, D7 one end ground connection, the other end links to each other with capacitor C 8, the other end of C8 links to each other with resistance R 6, and the other end of R6 is connected on the anode of controllable silicon SCR 1.Autodiagnosis current generating circuit 21 provides an artificial fault detection signal for the control circuit of ground-fault interrupter automatically, as long as this control circuit adds and powers on, whether ground-fault interrupter just begins autodiagnosis, need not manually go test circuit normal again; In order not have influence on the operate as normal of this control circuit, the normal dropout of ground-fault interrupter just, by diode D6 of end serial connection and the diode D8 of lead serial connection that passes magnetic test coil N1 center at tripping coil, human failure signal when normal trip signal that leakage current is caused and autodiagnosis is separately on the positive-negative half-cycle of power supply, if one is positioned on the negative half period, another just is positioned on the positive half cycle so, and the normal trip signal that causes with fault current in the present embodiment is positioned on the negative half period of power supply and the human failure signal on the autodiagnosis circuit is positioned on the positive half cycle of power supply and illustrates.As shown in Figure 1, positive half cycle at power supply, the human failure electric current forms a loop through magnetic test coil N1 center, resistance R 9 and triode Q, resistance R 9 limits the size of this fault current, magnetic test coil N1 two ends induce corresponding induced voltage at once and input to dropout control circuit 16 like this, after amplifying, reach the setting threshold values, triggering signal of trigger end 5 pin output of dropout control circuit 16 is given controllable silicon SCR 1, make its conducting, in case controllable silicon SCR 1 conducting, capacitor C 8 forms a loop with the input of resistance R 6, controllable silicon SCR 1 and optocoupler OC.Because when the negative half period of alternating current, capacitor C 8 has been finished charging process, so its upper end has accumulated certain positive charge, lower end accumulation negative electrical charge.And when alternating current during for positive half cycle, capacitor C 8 will be discharged, and causes optocoupler OC conducting.At this moment, because the effect of diode D6, trip circuit 23 can conducting, and tripping coil J can not trigger release.The output of optocoupler OC is connected with second switch pipe SCR2, and second switch pipe SCR2 is a controllable silicon.After the optocoupler OC conducting, triggering signal of output is given controllable silicon SCR 2 on the emitter of its output, makes controllable silicon SCR 2 also follow conducting, in case controllable silicon SCR 2 conductings, just do not had bias voltage on the base stage of triode Q, caused the triode Q of conducting state to turn-off, promptly stopped autodiagnosis.Arrive the positive half cycle in the next cycle of alternating current, begin to repeat automatically autodiagnosis again.Diode D7 of end serial connection of capacitor C 8 so neither can have influence on capacitor C 8 and charge normal at the negative half period of power supply, can not have influence on the operate as normal at the positive half cycle optocoupler of power supply OC again.The present invention has made full use of the characteristics of the positive-negative half-cycle of power supply, both reached the function of autodiagnosis, can not have influence on normal dropout again, and in this autodiagnosis circuit, utilized the on-off action of triode, make the human failure signal in the described autodiagnosis circuit in positive half cycle, to set in the short time, even if testing circuit response time-delay a little to some extent like this, the negative half period that also can not have influence on normal dropout gets on.Those skilled in the art will readily appreciate that the present invention also can be arranged to the positive half cycle of power supply and normally thread off, and the autodiagnosis fault detection signal is provided on the power-half cycle.
Capacitor C 7, resistance R 10 and diode (LED) 1 constitute an end life indicating circuit 19.When the control circuit of circuit breaker normally carries out autodiagnosis, optocoupler OC is operate as normal also, the emitter of the output of optocoupler OC provides a triggering signal to controllable silicon SCR 2, make controllable silicon SCR 2 conducting always, malfunction indicator lamp LED 1 has been equivalent to by short circuit, so malfunction indicator lamp LED 1 does not work under the normal condition.When control circuit has fault; broken such as some main electronic devices and components; perhaps creepage protection function has been lost, and will cause optocoupler OC not work, and optocoupler OC does not work; controllable silicon SCR 2 will become cut-off state from conducting state; like this, originally can form loops, have to form the loop through malfunction indicator lamp LED 1 by controllable silicon SCR 2; make that malfunction indicator lamp LED 1 is shinny, remind the user promptly in time to change employed ground-fault interrupter.As shown in fig. 1, if D6 or tripping coil J have opened circuit, at the negative half period of power supply, capacitor C 8 just can not be charged, like this, and when the positive half cycle autodiagnosis of power supply detects, capacitor C 8 is not put electricity or is not filled electricity, so controllable silicon SCR 2 also turn-offs, and malfunction indicator lamp LED 1 is shinny; If magnetic test coil N1 has broken, during autodiagnosis, just induction is less than the corresponding such controllable silicon SCR 1 not conducting of signal so, and capacitor C 8 is not put electricity, and optocoupler OC does not work, and causes controllable silicon SCR 2 to be turn-offed yet, and malfunction indicator lamp LED 1 is shinny; If the IC amplifying circuit has been broken, the fault-signal that magnetic test coil N1 induces just can not be exaggerated, and controllable silicon SCR 2 is bad, same reason, and malfunction indicator lamp LED1 is shinny.If triode Q has opened circuit, the autodiagnosis circuit is not worked, controllable silicon SCR 2 just not conductings so, thereby malfunction indicator lamp LED 1 is also shinny.In a word, if when control circuit of the present invention loses creepage protection function, end-of-life indicator light LED 1 will be shinny, reminds the user to change the protective device that is just using, and guaranteed fail safe.
Control circuit of the present invention can also add other critical function.As among Fig. 1 to Fig. 5, Test Switchboard TEST, test resistance R0 constitute a test circuit; Wherein, test resistance R0 is connected with power end, and the R0 other end is connected with Test Switchboard TEST, and the Test Switchboard other end is connected with the other end of load Load.Test circuit is to provide fault current about 8mA to ground-fault interrupter, makes regular check on the operating state of ground-fault interrupter.
Reset switch RESET, disconnect K, resistance R 4, capacitor C 5, resistance R 5, diode D5, controllable silicon SCR 1, tripping coil J etc. constitute a reset control circuit.Wherein controllable silicon SCR 1 is a controllable silicon, disconnect K links to each other with R2, and the disconnect K other end is connected with R4, C6, and R4, the C6 other end extremely link to each other with the control of controllable silicon SCR 1, in capacitor C 4 of controllable silicon SCR 1 control utmost point serial connection, this electric capacity plays anti-interference effect; Controllable silicon SCR 1 anode links to each other with the end of tripping coil J, and the other end of tripping coil J links to each other with the ground-fault interrupter power supply by diode D6 of serial connection again.Reset switch RESET one end is connected with power end Line, and the other end is connected with load end Load.This reset switch RESET can be arranged to link to each other with a load at least; The power supply of reset control circuit and ground-fault interrupter control circuit are simultaneously charged.When disconnect K is switched on, DC power supply produces a triggering signal by capacitor C 6 chargings at R4, this signal makes controllable silicon SCR 1 conducting, tripping coil J is switched on artificially, produce the electromagnetic force of a moment, make the release action in the circuit breaker, cause reset switch RESET closure, promptly ground-fault interrupter is in reset mode.Utilize discharging and recharging of capacitor C 6, guarantee the every closure of disconnect K once, the controllable silicon SCR 1 of control tripping coil J can only trigger once, and tripping coil J just can not burnt out because of long-term conducting like this; Reset control circuit is set to and controllable silicon SCR 1 of the common use of the control circuit of threading off, and makes earth fault increase the function of reverse-connection protection like this, does not also cause too many cost to improve simultaneously.
Neutral ground protection coil N2, capacitor C 2, capacitor C 3 constitute a neutral ground fault secure circuit.Two leads of load connecting circuit 20 pass neutral ground protection coil N2.Neutral coil N2 two ends are in parallel with capacitor C 2, and the one end is connected with capacitor C 3, other end ground connection, and capacitor C 3 other ends are connected with integrated amplification chip IC output 7 pin.Neutral misconnection ground protection constitutes the corresponding frequency of oscillation of transformer coupled amount of money ground sine-wave oscillator by N1, N2; when the neutral ground phenomenon of the failure takes place; this oscillator starting of oscillation; when amplitude reaches integrated amplification chip IC and sets threshold values; the trigger end 5 pin output triggering signal of integrated amplification chip IC; the action of having threaded off, ground-fault interrupter disconnects.
Power end piezo-resistance Mov in parallel, when suddenly high-tension electricity being arranged in the power supply, but the transient absorption high voltage plays a protective role.
When the reversal connection line; power supply links to each other in load Load end; like this before reset switch RESET does not have closure; control circuit is uncharged; therefore disconnect just can not be closed; controllable silicon SCR 1 can not be subjected to the human failure triggering and conducting; that is to say in this case; tripping coil J can not be subjected to the human failure triggering and conducting; that is to say that in this case tripping coil J can not produce the release that a corresponding electromagnetic force acts on ground-fault interrupter, ground-fault interrupter can not reset; therefore ground-fault interrupter just can not switched on, thereby has reached backing protection function.
The control circuit of ground-fault interrupter of the present invention also can be arranged to have only a load end output, and as shown in Figure 3, the control circuit of this spline structure often can be used on the ground-fault interrupter of plug form.
The control circuit of ground-fault interrupter of the present invention makes an amendment slightly; just can make the control circuit of other earth leakage protective device into; as shown in Figure 4; can be used on the electric apparatus of electric leakage protection of the socket type of having only creepage protection function; it also has backing protection function, and output can be with one more than the load at least.As shown in Figure 5; often can be used on the earth leakage protective device of the plug form of having only creepage protection function; the earth leakage circuit breaker of picture ALCI, LCDI and so on plug form; existing leak current fault defencive function; also have end-of-life autodiagnosis function and end-of-life deixis; break through the shortcoming that earth leakage protective device in the past can not the end-of-life response, improved the security performance of earth leakage protective device greatly.
In sum; the control circuit of ground-fault interrupter provided by the present invention not only has the leak current fault defencive function; can also have backing protection function, neutral ground failure protection function, autodiagnosis function and end-of-life deixis have improved the security of products energy greatly.
Above-described only is essential characteristic of the present invention, and the technical staff in this field can make multiple modification and/or change and should be considered as belonging to protection scope of the present invention described embodiment.
Claims (8)
1, a kind of control circuit of ground-fault interrupter, it has creepage protection function, and it comprises load connecting circuit (20), is used to connect power end (Line) and load end (Load) and transmits alternating current;
Electric-leakage detection circuit (15) comprises magnetic test coil (N1), and magnetic test coil (N1) is used for converting the magnetic flux change amount by wherein to induced potential output, and the lead of described load connecting circuit (20) passes described magnetic test coil (N1);
Trip circuit (23) comprises tripping coil (J), and described tripping coil (J) is used for electric current is converted into electromagnetic force;
Dropout control circuit (16), described dropout control circuit (16) is connected electrically between electric-leakage detection circuit (15) and the tripping coil (J), described dropout control circuit (16) is used for the signal of telecommunication and a preset value of input are compared, when the signal of telecommunication of input during greater than described preset value, described dropout control circuit (16) thus output output significant level control described trip circuit (23) work;
It is characterized in that:
The control circuit of described ground-fault interrupter also comprises
Autodiagnosis current generating circuit (21), an end of described autodiagnosis current generating circuit (21) is coupled to the phase line of described load connecting circuit (20), and the other end passes from described magnetic test coil (N1);
Autodiagnosis display circuit (17) is used to show whether creepage protection function is intact;
First switching tube (22), described first switching tube (22) has the control end of two links and the described link turn-on and turn-off of control, the control end of described first switching tube (22) is coupled to the output of described dropout control circuit (16), and described trip circuit (23) and autodiagnosis display circuit (17) are connected to the link of first switching tube (22) respectively; When the transmission alternating current of described input is in positive half cycle, a conducting in described trip circuit (23) and the autodiagnosis display circuit (17), when the alternating current of described input is in negative half period, another conducting in described trip circuit (23) and the autodiagnosis display circuit (17).
2, the control circuit of ground-fault interrupter according to claim 1, it is characterized in that: the control circuit of described ground-fault interrupter comprises also and is used for finishing the autodiagnosis termination circuit (18) that shows back disconnection autodiagnosis display circuit (17) at autodiagnosis display circuit (17) that described autodiagnosis termination circuit (18) comprises triode (Q).
3, the control circuit of ground-fault interrupter according to claim 2, it is characterized in that: described autodiagnosis display circuit (17) comprises optocoupler (OC), one output of described optocoupler (OC) is connected with second switch pipe (SCR2), described second switch pipe (SCR2) has the control end of two links and the described link turn-on and turn-off of control, and the control end of described second switch pipe (SCR2) is coupled to the emitter output of optocoupler (OC).
4, the control circuit of ground-fault interrupter according to claim 3, it is characterized in that: the control circuit of described ground-fault interrupter also comprises end life indicating circuit (19), described end life indicating circuit (19) is connected between two links of second switch pipe (SCR2), described end life indicating circuit (19) comprises the tenth resistance (R10) and light-emitting diode (LED1), be connected electrically in again between two links of described second switch pipe (SCR2) after the serial connection between described light-emitting diode (LED1) and the tenth resistance (R10), also be parallel with the 7th electric capacity (C7) between two links of described second switch pipe (SCR2).
5, the control circuit of ground-fault interrupter according to claim 3, it is characterized in that: described triode (Q) has base stage, the base stage of described triode (Q) is coupled to an anode link of described second switch pipe (SCR2), another cathode connection terminal ground connection of second switch pipe (SCR2).
6, according to the control circuit of the described ground-fault interrupter in the claim 5, it is characterized in that: described autodiagnosis current generating circuit (21) comprises the 8th diode (D8) and the 9th resistance (R9), described triode (Q) also has collector and emitter, serial connection back one end is connected to load connecting circuit (20) between described the 8th diode (D8) and the 9th resistance (R9), and the other end is connected to the collector electrode or the emitter of triode (Q).
7, the control circuit of ground-fault interrupter according to claim 1, it is characterized in that: described autodiagnosis display circuit (17) comprises the 6th resistance (R6), the 8th electric capacity (C8), the 7th diode (D7) and optocoupler (OC), be connected electrically between two links of described first switching tube (22) after described the 6th resistance (R6), the 8th electric capacity (C8), the 7th diode (D7) serial connection, described optocoupler (OC) is connected in parallel on the two ends of the 7th diode (D7) again.
8, the control circuit of ground-fault interrupter according to claim 1 is characterized in that: be electrically connected with the 6th diode (D6) in the described trip circuit (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101258355A CN100517896C (en) | 2006-07-24 | 2006-08-24 | Steering circuit for earthing fault breaker |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200620075979 | 2006-07-24 | ||
| CN200620075979.X | 2006-07-24 | ||
| CNB2006101258355A CN100517896C (en) | 2006-07-24 | 2006-08-24 | Steering circuit for earthing fault breaker |
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| Publication Number | Publication Date |
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| CN101083393A CN101083393A (en) | 2007-12-05 |
| CN100517896C true CN100517896C (en) | 2009-07-22 |
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| CNB2006101258355A Expired - Fee Related CN100517896C (en) | 2006-07-24 | 2006-08-24 | Steering circuit for earthing fault breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102008006360B3 (en) * | 2008-01-28 | 2009-07-23 | Siemens Aktiengesellschaft | Residual current circuit breaker and method for performing a self-test of a residual current circuit breaker |
| US8570181B2 (en) * | 2010-03-15 | 2013-10-29 | Siemens Industry, Inc. | Method and apparatus for supervisory circuit for ground fault circuit interrupt device |
| CN102457042B (en) * | 2010-10-26 | 2015-05-20 | 黄华道 | Novel electricity leakage detection protection circuit |
| CN102798789A (en) * | 2012-03-03 | 2012-11-28 | 深圳市南岛机电有限公司 | Abnormal fault flashing alarm indicating device of grounding system |
| CN102759710B (en) * | 2012-07-27 | 2016-04-20 | 胡小青 | Modified checkout equipment |
| CN109755921A (en) * | 2017-11-08 | 2019-05-14 | 苏州益而益电器制造有限公司 | Ground-fault interrupter |
| DE102016217470B4 (en) * | 2016-09-14 | 2020-10-01 | Siemens Aktiengesellschaft | Arrangement for detecting and switching off fault currents |
| CN106253216B (en) * | 2016-09-26 | 2018-11-06 | 东莞市达昌实业有限公司 | It is a kind of can timing earth leakage protective device |
| CN108199346A (en) * | 2018-01-15 | 2018-06-22 | 浙江正泰电器股份有限公司 | Band voluntarily diagnoses the residual current action breaker circuit of detection function |
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| US6052265A (en) * | 1998-11-20 | 2000-04-18 | Leviton Manufacturing Co., Inc. | Intelligent ground fault circuit interrupter employing miswiring detection and user testing |
| US6724590B1 (en) * | 2000-11-21 | 2004-04-20 | Pass & Seymour, Inc. | Ground fault circuit interrupter with indicator lamp and protective circuit powered from hot bus bar |
| CN1734876A (en) * | 2005-07-18 | 2006-02-15 | 吴少华 | Earth fault breaker |
| CN1794528A (en) * | 2005-12-09 | 2006-06-28 | 张家港华捷电子有限公司 | Grounding failure breaker |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6052265A (en) * | 1998-11-20 | 2000-04-18 | Leviton Manufacturing Co., Inc. | Intelligent ground fault circuit interrupter employing miswiring detection and user testing |
| US6724590B1 (en) * | 2000-11-21 | 2004-04-20 | Pass & Seymour, Inc. | Ground fault circuit interrupter with indicator lamp and protective circuit powered from hot bus bar |
| CN1734876A (en) * | 2005-07-18 | 2006-02-15 | 吴少华 | Earth fault breaker |
| CN1794528A (en) * | 2005-12-09 | 2006-06-28 | 张家港华捷电子有限公司 | Grounding failure breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101083393A (en) | 2007-12-05 |
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