CN204389621U - With electric detection means and arrangements of electric connection - Google Patents
With electric detection means and arrangements of electric connection Download PDFInfo
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- CN204389621U CN204389621U CN201420796319.5U CN201420796319U CN204389621U CN 204389621 U CN204389621 U CN 204389621U CN 201420796319 U CN201420796319 U CN 201420796319U CN 204389621 U CN204389621 U CN 204389621U
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Abstract
The utility model provides one electric detection means and arrangements of electric connection, this comprises with electric detection means: detection of electrical leakage unit, it comprises leakage indicator, and for detecting the electric leakage signal on supply lines in the first half cycle, and when electric leakage signal is more than or equal to first threshold, disconnect supply access; Whether self-test unit, is coupled to detection of electrical leakage unit, can normally work for detecting detection of electrical leakage unit in the second half cycle.The utility model, by controlling detection of electrical leakage unit, self-test unit work respectively in the positive-negative half-cycle of power supply, makes the security of circuit be improved further; The utility model also has the advantages such as cost is low, reliability is high, convenient for production.
Description
Technical field
The utility model belongs to domestic circuit field, particularly relates to a kind of earth detector.
Background technology
Along with improving constantly of people's living standard, the use of electric equipment products is day by day universal, and people also more and more pay attention to Electrical Safety.In order to Electrical Safety, although people are provided with earth leakage protective device at electrical network output terminal or at the input end of some household electrical appliance, and indicate " testing before use " at awake destination locations, whether normally supervise user to test the function of earth leakage protective device.But in use; because the environment used is different or the factor such as installation; people have also done to use front test to earth leakage protective device; if can earth leakage protective device creepage protection function in use to lose or when having exceeded former setting value; a such as electric heater with leakage protecting plug; in use lose earth leakage protection ability; electrothermal tube in water tank under waterly causes getting rusty or insulation course damages because of long-term; the electric leakage so produced will be conducted electricity along with water; if at this moment have people in shower; people will get an electric shock, and causes personal injury.
Therefore, need badly and a kind ofly can possess detection of electrical leakage and can also the device of self-inspection simultaneously.
Utility model content
For above problem, the utility model provides a kind of earth detector simultaneously possessing detection of electrical leakage and self-checking function.
The utility model proposes one electric detection means on the one hand, comprise: detection of electrical leakage unit, it comprises leakage indicator, and for detecting the electric leakage signal on supply lines in the first half cycle, and when described electric leakage signal is more than or equal to first threshold, disconnect supply access; Whether self-test unit, is coupled to described detection of electrical leakage unit, can normally work for detecting described detection of electrical leakage unit in the second half cycle.
Preferably, described self-test unit also comprises: simulation leakage current generation unit, for producing the first leakage current being greater than first threshold at least one supply lines.
Preferably, described self-test unit also comprises: comparing unit, and it is coupled to described simulation leakage current generation unit, produces described first leakage current for generation of the first drive singal to drive described simulation leakage current generation unit.
Preferably, described self-test unit also comprises: the cycle arranges assembly, and it comprises the first resistance and the first electricity that are connected in series, and is coupled to the first input end of on-off element and described comparing unit; Wherein, described on-off element provides the path of the charge discharging resisting on described first electric capacity.
Preferably, described comparing unit comprises: first input end, is coupled between described first resistance and the first electric capacity, for receiving the voltage signal on described first electric capacity; And second input end, be coupled to reference voltage generation unit, for receiving a reference voltage signal; Wherein, described period modulation assembly and described reference voltage generation unit receive from the voltage signal on same supply lines.
Preferably, described detection of electrical leakage unit also comprises: processor unit, and it is coupled to described on-off element and described leakage indicator, and drives described on-off element based on the output signal of described leakage indicator.
Preferably, the output terminal of described comparing unit is coupled to described on-off element, thus when making current potential higher than described second input end of current potential when described first input end, described comparing unit makes described switching elements conductive.
Preferably, described detection of electrical leakage unit also comprises: solenoid, and it is coupled to described on-off element, and when described on-off element is in described first half cycle conducting, described solenoid disconnects the reset switch be arranged on supply lines.
Preferably, described detection of electrical leakage unit also comprises: branch switch, is coupled between described solenoid and supply lines, and when described reset switch disconnects, described branch switch disconnects, and when described reset switch closes, described branch switch closes.
Preferably, described detection of electrical leakage unit also comprises Fisrt fault display unit, and it is coupled to described solenoid, for when generation current changes because of described switching elements conductive in described solenoid, sends fault display signal.
Preferably, described self-test unit also comprises: the second fault display unit, and it is coupled to the output terminal of described comparing unit, for when described comparing unit continues to export high level because described detection of electrical leakage unit breaks down, sends fault display signal.
Preferably, this device also comprises: the charged display unit of zero line, and it is coupled between ground wire and zero line, for determining whether based on the change in voltage on zero line sending the charged display of zero line.
Preferably, described self-test unit also comprises: driver element, and its first input end is coupled to the output terminal of described comparing unit, and its output terminal is coupled to the controlled stage of described on-off element, to drive described on-off element based on the output of described comparing unit.
Preferably, described on-off element is controllable silicon.
The utility model also proposed a kind of arrangements of electric connection, comprising: use electric detection means as above.
The utility model, by controlling detection of electrical leakage unit, self-test unit work respectively in the positive-negative half-cycle of power supply, makes the security of circuit be improved further; The utility model also has the advantages such as cost is low, reliability is high, convenient for production.
Accompanying drawing explanation
After description by reference to the embodiment of the present utility model given by following accompanying drawing, the utility model will be understood better, and other objects of the present utility model, details, feature and advantage will become more apparent.In the accompanying drawings:
Fig. 1 is the circuit diagram according to the utility model first embodiment;
Fig. 2 is the circuit diagram of the utility model second embodiment;
Fig. 3 is the circuit diagram of the utility model the 3rd embodiment;
Fig. 4 is the oscillogram of the circuit interior joint based on the utility model embodiment.
Embodiment
Below with reference to accompanying drawings preferred implementation of the present disclosure is described in more detail.Although show preferred implementation of the present disclosure in accompanying drawing, but should be appreciated that, the disclosure can be realized in a variety of manners and not should limit by the embodiment of setting forth here.On the contrary, provide these embodiments to be to make the disclosure more thorough and complete, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
In conjunction with diagram, embodiment of the present utility model is set forth.
Fig. 1 is the circuit diagram according to the utility model first embodiment, and Fig. 4 is the oscillogram of the circuit interior joint based on the utility model embodiment.
Comprise with electric detection means: (1) electric-leakage detection circuit 1, it is for detecting in supply lines whether produce leak current fault, and leak current fault here correspond to the electric leakage signal exceeding first threshold; (2) self-checking circuit 2, whether it can normally work for detecting electric-leakage detection circuit 1.These two circuit are configured to further, are operated in the positive-negative half-cycle of the sinusoidal ac in supply lines respectively, namely in a half cycle, detect leak current fault, whether normal detect leak current fault circuit in another half cycle.
Electric-leakage detection circuit 1 comprises: the elements such as magnetic test coil ZCT, solenoid SOL, thyristor Q1, diode D5 and processor IC1.Be understandable that, thyristor Q1 also can replace with the element that other possesses switching function, such as, metal-oxide-semiconductor.
Self-checking circuit 2 comprises: comparing unit IC2 and simulation leakage current generation unit, wherein, comparing unit periodically produces comparative result, and then drive simulation leakage current generation unit to produce leakage current, simulation leakage current generation unit then produces the first leakage current being greater than first threshold at least one supply lines, in FIG, leakage current generation unit is simulated at upper generation first leakage current of zero line (N).
Understandable, what simulation leakage current generation unit here produced is the electric current that self-checking circuit 2 initiatively produces, the leakage current produced during for simulating power supply trouble.
The two ends of coil ZCT are coupled to the pin 1 and 3 of processor IC1, and when the change in voltage that ZCT exports is greater than threshold value, the pin 5 of IC1 exports high level, otherwise, output low level.Rectifier bridge D1-D4 is coupled to live wire (L), N line respectively, and is coupled to the pin 6 of IC1 by resistance R3, all can provide working power for IC1 at two half cycles.The pin 7 of IC1 is coupled to coil RING2, for reading the changing value of the induced voltage on RING2.
Branch road auxiliary switch SW1 and reset switch RESET links, and namely RESET closes, and SW1 also closes, and vice versa.
Please also refer to Fig. 1, Fig. 4.After reset switch RESET resets, L, N supply lines will power on, and the ac power waveform at A point place is sinusoidal wave.
Respectively electric-leakage detection circuit, self-checking circuit are set forth in the working condition of each half cycle, for the ease of setting forth, here for positive half cycle, negative half period.
Positive half cycle: detect leak current fault
In this half cycle, SW1 and RESET is all closed, and whether ZCT detects on L, N line has leakage current to produce.
If now do not have leakage current to produce, then IC1 is in pin 5 output low level, and controllable silicon Q1 cannot conducting, thus the electric current in solenoid SOL can not change, thus switch RESET can not be made to disconnect.
If now there is leakage current to produce, then, after ZCT exports induced voltage to the pin 1,3 of IC1, IC1 exports high level at pin 5, thus conducting controllable silicon Q1, controllable silicon Q1 control the waveform of pole corresponding to the waveform E in Fig. 3.Now, the electric current in solenoid SOL produces larger change by because of silicon controlled conducting, and RESET is disconnected, and then cut-off switch SW1, has cut off the current path of L line to N line.
When supply access keeps power supply state, namely when the electric current in solenoid does not produce the larger change of the electric current that causes because of controllable silicon Q1, be coupled to solenoidal Fisrt fault display unit (comprising resistance R4 and LED 1) will send display always, to inform user, now RESET switch is closed.When after controllable silicon Q1 conducting, reset switch RESET will disconnect, and now Fisrt fault display unit will no longer show, thus inform user now supply access disconnect.In addition, when solenoid SOL damages, namely the coil of SOL defines open circuit, and now Fisrt fault display unit also no longer shows.
For self-checking circuit 2, because N line is not now powered to it, therefore, at positive half cycle, electric-leakage detection circuit 1 works, and self-checking circuit 2 does not work.
Negative half period: circuitry self test
Similar, in this half cycle, SW1 and RESET is all closed, and the leakage current that whether has that ZCT detects on L, N line produces.
Self-checking circuit 2 also comprises the cycle and arranges assembly, and this cycle arranges assembly and comprises the resistance R8 and electric capacity C7 that are connected in series, and the cycle arranges the first input end (positive pole) that assembly is also coupled to thyristor Q1 and comparing unit.Obviously, when controllable silicon Q1 conducting, it can provide the path of the charge discharging resisting on electric capacity C7, thus reduces the voltage of electric capacity C7.
The positive pole of comparing unit is coupled between resistance R8 and electric capacity C7, and for receiving the voltage signal on electric capacity C7, the negative pole of comparing unit is coupled to the reference voltage generation unit comprising resistance R7, R6, for receiving reference voltage signal.Therefore, period modulation assembly and reference voltage generation unit all receive from the voltage signal on N line
Situation 1: electric-leakage detection circuit is working properly:
Because the resistance R8 on IC2 positive pole, electric capacity C7 are connected to N line by resistance R5, therefore, the resistance R8 be connected on IC2 positive pole will charge to electric capacity C7 at this half cycle.When the voltage on C7 is higher than voltage (i.e. the negative pole of IC2) on R6, the output terminal of IC2 will reverse, and high level appears in IC2 output terminal C point.
C point is coupled to the base stage of triode Q2 by resistance R9, therefore, C point is once export high level, and Q2 is conducting just, and then the current potential of drop-down B point, and the time of Q2 conducting then depends on that the high level of C point is held time.The conducting of Q2, introduces pre-set value electric current I c to ZCT, and obviously, electric current I c should be more than or equal to the threshold value I that leak current fault detects electric current
f, otherwise the output signal of the ZCT corresponding to electric current I c cannot be identified as effective electric leakage signal by IC1.Therefore, introduced the leakage current detected for ZCT by triode Q2 and resistance R12, flow to L line, to form current return from the D2 of emitter through rectifier bridge of Q2.
For electric current I c, the IC1 output signal based on ZCT, pin 5 exports high level signal, thus make controllable silicon Q1 conducting.Now, then diode D6 is also by conducting in Q1 conducting, and because diode D6 is connected on the positive pole of electric capacity C7 and the positive pole of IC2, therefore electric capacity C7 will be discharged by diode D6, controllable silicon Q1, the cathode voltage of IC2 is reduced rapidly, and then causes IC2 output terminal to be reversed to low level.
When IC2 positive pole level lower than negative electricity at ordinary times, the C point output low level of IC2, triode Q2 is closed.Now, owing to stopping providing electric current (namely electric current I c does not produce) to ZCT, ZCT does not detect leakage current, therefore, the pin 5 of IC1 and the control pole (D point) of Q1 are zero level, known, this is when negative half period electric-leakage detection circuit 1 is working properly, and the current potential on electric capacity C7 is depended in the conducting of controllable silicon Q1.Because on electric capacity C7, electric charge is released, its voltage also will decline, thus cannot reach the threshold voltage of controllable silicon Q1 and/or diode D6 conducting, and therefore, controllable silicon Q1 now will be closed.
When leak current fault testing circuit 1 is working properly and preset current value I
fwhen not changing, next cycle starts, for electric capacity C7 charges, to repeat process as above.Can be adjusted the length of sense cycle by the parameter changing C7 and R8, this sense cycle can be the integral multiple of ac period.
Situation 2: electric-leakage detection circuit 1 works abnormal
Now, electric-leakage detection circuit 1 breaks down or preset current value I
fbecome large, such as electric capacity C2 open circuit, IC1 damage etc. cause electric-leakage detection circuit 1 to lose earth leakage protection ability, or preset current value I
fbecome the leakage current Ic causing greatly self-test unit to produce and be less than I
f, now, the pin 5 of IC1 by output low level, i.e. Q1 not conducting.Now, electric capacity C7 does not discharge road, thus causes the current potential of electric capacity C7 all the time higher than the negative pole end of IC2, and namely C point continues to export high level, so triode Q2 conducting all the time, LED2 continues to light, and can not continue to use to point out this earth leakage protective device of user.
If now controllable silicon Q1, diode D6 and D7 all do not damage, then comparing unit IC2 will be charged to electric capacity C8 by resistance R11, when current potential reaches setting value, and diode D7 conducting, Q1 conducting.Because now comparing unit IC2 will continue to export high level, therefore, the electric current made in solenoid SOL increases by the conducting of controllable silicon Q1 instantaneously, thus disconnects reset switch RESET, and the electric power being namely disconnected constrained input connects, and impels user not use.
In the cycle T 1 of Fig. 4, because N line is comparatively slow to the duration of charging of electric capacity C7, the output waveform of C point does not reach high level completely, and when the voltage on electric capacity C7 is more than voltage on R6, the voltage of C point just starts to reverse, thus unlatching controllable silicon Q1.Accordingly, controllable silicon Q1 also cannot open completely, as shown in waveform D, thus causes the electric charge on electric capacity C7 to be difficult to release completely.In cycle T 2, owing to electric capacity C7 remaining with the electric charge of not releasing in the T1 cycle, therefore, voltage on electric capacity C7 can be lifted to higher level by the continuation charging of N line to electric capacity C7, thus C point is reversed completely, reach high level, and this high level makes controllable silicon Q1 to open completely, and then the electric charge on electric capacity C7 of releasing completely.Accordingly, corresponding to the waveform of B point, it does not have waveform generation at positive half cycle, when negative half period, because C point is for can its level drop-down during high level, therefore, B point is still low level in the incipient stage of negative half period, and when C point is reversed to low level, B point waveform is consistent with A point waveform.Understandable, the breach outline of B point waveform in cycle T 2 is higher than the breach in cycle T 1.
Obviously, by the value of setting resistance R8, electric capacity C7, the length from the overhaul period can be controlled.In cycle T 3, T4, because the electric charge on electric capacity C7 is released completely in cycle T 2, thus make in these two cycles, undertension on electric capacity C7 reverses to make the output terminal of comparing unit IC2, equally, when C point can not reverse, controllable silicon Q1 can not conducting, N line continues to C7 charging, until cycle T
n+1.Identical with cycle T 1, in cycle T
n+1in, the voltage on electric capacity C7 can make the output terminal of comparer IC2 reverse; Identical with cycle T 1, in cycle T
n+2in, released completely with the electric charge on electric capacity C7, C point is reversed to low level again.
Be understandable that, above-mentioned positive and negative half cycle is not intended to limit purposes and the structure of circuit, as long as carry out adaptive adjustment to circuit, above-mentioned positive and negative half cycle also can be exchanged mutually.
Fig. 2 is the circuit diagram of the utility model second embodiment.
Compared to the first embodiment, the present embodiment eliminates interrupteur SW 1, and electric-leakage detection circuit 1, self-checking circuit 2 are all connected in the supply lines after reset switch RESET, and therefore, the present embodiment is more suitable for the circuit in electrical appliance.
Similar with the first embodiment, after reset switch is closed, N line will charge to electric capacity C7 at negative half period, and then the state of the output terminal C of control IC2, and IC1 still controls controllable silicon Q1 whether conducting by pin 5, when controllable silicon Q1 conducting, solenoid SOL introduces big current, and then disconnect reset switch RESET, disconnect the path between supply lines and circuit.
The present embodiment also comprises the charged display unit 3 of zero line be coupled between ground wire (G) and N line, and the charged display unit 3 of this zero line comprises electric capacity C5, resistance R1, bilateral diode T1 and LED3 and diode D8.The charged display unit of zero line 3 is for determining whether based on the change in voltage on N line sending the charged display of zero line.
Fig. 3 is the circuit diagram of the utility model the 3rd embodiment.
Compared to the second embodiment, the present embodiment has also coupled driver element IC3 at the output terminal of comparing unit IC2, drives thyristor Q1 with the output of unit IC2 based on the comparison.
Driver element IC3 comprises the amplifier connected in positive feedback.The output terminal of IC3 is coupled to its positive pole by diode D8, and is connected to the control pole of controllable silicon Q1 by diode D7, and the negative pole of IC3 and IC2 shares same input.Therefore, when the output terminal reversion of IC2, the output terminal of IC3 also will synchronously reverse.Because driver element IC3, diode D8 constitute positive feedback, therefore, the reversion of IC3 can be faster, and driving force obtains enhancing, and namely controllable silicon Q1 can be opened completely.
The utility model, by controlling detection of electrical leakage unit, self-test unit work respectively in the positive-negative half-cycle of power supply, makes the security of circuit be improved further.
Those skilled in the art, it is understood that above-mentioned state is only for example, are not intended to limit range of application of the present utility model.Those skilled in the art for often kind of application-specific, can realize described function in the mode of accommodation, but, thisly realize decision-making and should not be construed as and deviate from protection domain of the present utility model.
Claims (15)
1. with an electric detection means, it is characterized in that, comprising:
Detection of electrical leakage unit, it comprises leakage indicator, and for detecting the electric leakage signal on supply lines in the first half cycle, and when described electric leakage signal is more than or equal to first threshold, disconnect supply access;
Whether self-test unit, is coupled to described detection of electrical leakage unit, can normally work for detecting described detection of electrical leakage unit in the second half cycle.
2. device as claimed in claim 1, it is characterized in that, described self-test unit also comprises:
Simulation leakage current generation unit, for producing the first leakage current being greater than first threshold at least one supply lines.
3. device as claimed in claim 2, it is characterized in that, described self-test unit also comprises:
Comparing unit, it is coupled to described simulation leakage current generation unit, produces described first leakage current for generation of the first drive singal to drive described simulation leakage current generation unit.
4. device as claimed in claim 3, it is characterized in that, described self-test unit also comprises:
Cycle arranges assembly, and it comprises the first resistance and the first electric capacity that are connected in series, and is coupled to the first input end of on-off element and described comparing unit;
Wherein, described on-off element provides the path of the charge discharging resisting on described first electric capacity.
5. device as claimed in claim 3, is characterized in that,
Described comparing unit comprises:
First input end, is coupled between described first resistance and the first electric capacity, for receiving the voltage signal on described first electric capacity; And
Second input end, is coupled to reference voltage generation unit, for receiving a reference voltage signal;
Wherein, described period modulation assembly and described reference voltage generation unit receive from the voltage signal on same supply lines.
6. device as claimed in claim 4, it is characterized in that, described detection of electrical leakage unit also comprises:
Processor unit, it is coupled to described on-off element and described leakage indicator, and drives described on-off element based on the output signal of described leakage indicator.
7. device as claimed in claim 5, is characterized in that,
The output terminal of described comparing unit is coupled to described on-off element, thus when making current potential higher than described second input end of current potential when described first input end, described comparing unit makes described switching elements conductive.
8. device as claimed in claim 4, it is characterized in that, described detection of electrical leakage unit also comprises:
Solenoid, it is coupled to described on-off element, and when described on-off element is in described first half cycle conducting, described solenoid disconnects the reset switch be arranged on supply lines.
9. device as claimed in claim 8, it is characterized in that, described detection of electrical leakage unit also comprises:
Branch road auxiliary switch, is coupled between described solenoid and supply lines, and when described reset switch disconnects, described branch road auxiliary switch disconnects, and when described reset switch closes, described branch road auxiliary switch closes.
10. device as claimed in claim 8, it is characterized in that, described detection of electrical leakage unit also comprises
Fisrt fault display unit, it is coupled to described solenoid, for showing the break-make of current supply access.
11. devices as claimed in claim 4, it is characterized in that, described self-test unit also comprises:
Second fault display unit, it is coupled to the output terminal of described comparing unit, for when described comparing unit continues to export high level because described detection of electrical leakage unit breaks down, sends fault display signal.
12. devices as claimed in claim 4, is characterized in that, also comprise:
The charged display unit of zero line, it is coupled between ground wire and zero line, for determining whether based on the change in voltage on zero line sending the charged display of zero line.
13. devices as claimed in claim 4, it is characterized in that, described self-test unit also comprises:
Driver element, its first input end is coupled to the output terminal of described comparing unit, and its output terminal is coupled to the controlled stage of described on-off element, to drive described on-off element based on the output of described comparing unit.
14. devices according to any one of claim 4,6 to 8,10 and 13, is characterized in that,
Described on-off element is controllable silicon.
15. 1 kinds of arrangements of electric connections, is characterized in that, comprising: as described in any one of claim 1 to 13, use electric detection means.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420796319.5U CN204389621U (en) | 2014-12-15 | 2014-12-15 | With electric detection means and arrangements of electric connection |
| US14/614,334 US9547047B2 (en) | 2014-12-15 | 2015-02-04 | Leakage current detection device with self-testing function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420796319.5U CN204389621U (en) | 2014-12-15 | 2014-12-15 | With electric detection means and arrangements of electric connection |
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| CN204389621U true CN204389621U (en) | 2015-06-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026427A (en) * | 2016-02-02 | 2017-08-08 | 益而益(集团)有限公司 | Use electric detection means |
| CN107305230A (en) * | 2016-04-20 | 2017-10-31 | 益而益(集团)有限公司 | Use electric detection means |
| CN108666972A (en) * | 2017-04-01 | 2018-10-16 | 苏州益而益电器制造有限公司 | Earth leakage protective device |
-
2014
- 2014-12-15 CN CN201420796319.5U patent/CN204389621U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026427A (en) * | 2016-02-02 | 2017-08-08 | 益而益(集团)有限公司 | Use electric detection means |
| CN107026427B (en) * | 2016-02-02 | 2019-10-18 | 益而益(集团)有限公司 | Use electric detection means |
| CN107305230A (en) * | 2016-04-20 | 2017-10-31 | 益而益(集团)有限公司 | Use electric detection means |
| CN107305230B (en) * | 2016-04-20 | 2023-05-19 | 益而益(集团)有限公司 | Electricity consumption detection device |
| CN108666972A (en) * | 2017-04-01 | 2018-10-16 | 苏州益而益电器制造有限公司 | Earth leakage protective device |
| CN108666972B (en) * | 2017-04-01 | 2024-04-19 | 苏州益而益电器制造有限公司 | Leakage protector |
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