CN103176093A - Leakage detection circuit - Google Patents
Leakage detection circuit Download PDFInfo
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- CN103176093A CN103176093A CN2011104356238A CN201110435623A CN103176093A CN 103176093 A CN103176093 A CN 103176093A CN 2011104356238 A CN2011104356238 A CN 2011104356238A CN 201110435623 A CN201110435623 A CN 201110435623A CN 103176093 A CN103176093 A CN 103176093A
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Abstract
The embodiment of the invention discloses a leakage detection circuit which is connected with an electric device casing through a casing interface. The leakage detection circuit includes a bleeder circuit, a switching circuit and an alarm circuit, wherein the bleeder circuit is arranged between the casing interface and the ground and used for detecting leakage voltage generated by the electric device casing when the casing interface is connected with the electric device casing; the control terminal of the switching circuit is connected with the bleeder circuit, and the switching circuit is closed when the leakage voltage generated by the bleeder circuit reaches an alarm threshold value; and the alarm circuit is connected in series between the switching circuit and the anode of a power supply and used for generating alarm signals to alarm when the switching circuit is closed. The leakage detection circuit detects whether the electric device casing is charged by judging whether the bleeder circuit generates leakage voltage, and alarms when the electric device casing is charged, thereby being capable of timely reminding people to pay attention to check and clear troubles, particularly being capable of reminding maintenance personnel to pay attention to the safety during maintenance to avoid electric shock.
Description
Technical field
The present invention relates to testing circuit, relate in particular to a kind of electric-leakage detection circuit.
Background technology
After general fixed installation class light fixture broke down, the maintenance personal will keep in repair it.But, be which kind of reason causes light fixture to break down because the maintenance personal is unclear, do not know whether fault affects the ground connection performance of light fixture yet, therefore in the process that checks, probably maintenance personal's personal safety threatened.When the fault of light fixture causes its ground connection loses in performance, the shell of light fixture will be charged, and this leaky probably makes the maintenance personal get an electric shock when maintenance.
Summary of the invention
Embodiment of the present invention technical matters to be solved is, a kind of electric-leakage detection circuit is provided.But whether the fast detecting electric appliance casing is charged, ensures electrical equipment is used and safety when keeping in repair.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of electric-leakage detection circuit, and by enclosure interface connecting circuit shell, described electric-leakage detection circuit comprises:
Bleeder circuit is connected between described enclosure interface and ground, and described bleeder circuit is used for detecting the electrical leakage voltage that described electric appliance casing produces when described enclosure interface is connected to electric appliance casing;
On-off circuit, the control end of described on-off circuit is connected with described bleeder circuit, the conducting when electrical leakage voltage that described on-off circuit produces at described bleeder circuit reaches alarm threshold value;
Warning circuit is connected between described on-off circuit and positive source, is used for generating alerting signal and reports to the police when described on-off circuit conducting.
Wherein, described bleeder circuit comprises the first resistance and second resistance of series connection successively, and the common node of described the first resistance and the second resistance is connected to the control end of described on-off circuit.
Wherein, described electric-leakage detection circuit also comprises detecting circuit, and described detecting circuit is connected between the common node and described on-off circuit of described the first resistance and the second resistance.
Wherein, described detecting circuit comprises diode, and the positive pole of described diode is connected to the common node of described the first resistance and described the second resistance, and the negative pole of described diode is connected to control end and the ground of described on-off circuit.
Wherein, described detecting circuit also comprises detection electric capacity, and an end of described detection electric capacity is connected to ground, and the other end of described detection electric capacity is connected to the negative pole of described diode.
Wherein, described warning circuit comprises phonation circuit, and described phonation circuit generates alarm sound when described on-off circuit conducting.
Wherein, described phonation circuit comprises connected resonant circuit and loudspeaker, and described resonant circuit provides oscillating current for described loudspeaker.
Wherein, described resonant circuit comprises the 3rd resistance, the second triode and the second electric capacity, described the second triode is the NPN pipe, the base stage of described the second triode is connected to positive source by described the 3rd resistance, the collector of described the second triode is connected to described positive source, the emitter of described the second triode is connected to ground by described on-off circuit, and the emitter of described the second triode also is connected to ground by described the second electric capacity, described loudspeaker and described on-off circuit successively.
Wherein, described phonation circuit also comprises driving circuit, and described driving circuit is connected between described positive source and described loudspeaker, for described loudspeaker provide drive current.
Wherein, described on-off circuit comprises one-way SCR.
Implement the embodiment of the present invention, has following beneficial effect: whether produce electrical leakage voltage by bleeder circuit whether detect electric appliance casing charged by judging, and report to the police when electric appliance casing is charged, can in time remind people to note checking and fixing a breakdown, especially can remind the maintenance personal to take care when maintenance, avoid getting an electric shock.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the first example structure schematic diagram of electric-leakage detection circuit provided by the invention;
Fig. 2 is the second example structure schematic diagram of electric-leakage detection circuit provided by the invention;
Fig. 3 is the 3rd example structure schematic diagram of electric-leakage detection circuit provided by the invention;
Fig. 4 is the 4th example structure schematic diagram of electric-leakage detection circuit provided by the invention;
Fig. 5 is the 5th embodiment circuit diagram of electric-leakage detection circuit provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Referring to Fig. 1, be the first example structure schematic diagram of electric-leakage detection circuit provided by the invention.As shown in Figure 1, this circuit comprises:
On-off circuit 2, on-off circuit 2 can comprise a control end and two links, and on-off circuit 2 is connected between warning circuit 3 and ground by link, and the control end of on-off circuit 2 is connected with bleeder circuit 1.When the electrical leakage voltage that produces on bleeder circuit 1 reaches alarm threshold value, on-off circuit 1 conducting; During lower than alarm threshold value, on-off circuit 1 disconnects when the electrical leakage voltage that does not produce electrical leakage voltage or generation on bleeder circuit 1.
In the course of work of circuit, bleeder circuit 1 is connected with electric appliance casing by enclosure interface, if electric appliance casing is not charged, can not produce electrical leakage voltage on bleeder circuit 1, and on-off circuit 2 disconnects, and warning circuit 3 can't be worked; If electric appliance casing is charged, will produce electrical leakage voltage on bleeder circuit 1, the control end of on-off circuit 2 is in conducting state after receiving electrical leakage voltage, and the warning circuit 3 of connecting with on-off circuit 2 simultaneously begins to produce alerting signal and reports to the police.
Whether a kind of electric-leakage detection circuit provided by the invention produces electrical leakage voltage by bleeder circuit whether detect electric appliance casing charged by judging, and report to the police when electric appliance casing is charged, can in time remind people to note checking and fixing a breakdown, especially can remind the maintenance personal to take care when maintenance, avoid getting an electric shock.
Referring to Fig. 2, be the second example structure schematic diagram of electric-leakage detection circuit provided by the invention.Fig. 2 is the further description to electric-leakage detection circuit shown in Figure 1.As shown in Figure 2, this circuit comprises bleeder circuit 1, on-off circuit 2 and warning circuit 3.
Although Fig. 2 shows a kind of concrete structure of bleeder circuit 1, the present invention is not limited to this.It will be appreciated by those skilled in the art that the present invention can also comprise the bleeder circuit structure that is used for providing electrical leakage voltage of other any appropriate.But bleeder circuit 1 as shown in Figure 2 is not only simple in structure, and is easy to regulate, and only needs to change the resistance value of the first resistance 11 and the second resistance 12, just can change the intrinsic standoff ratio of the first resistance 11 and the second resistance 12, and then changes warning sensitivity.
Referring to Fig. 3, be the 3rd example structure schematic diagram of electric-leakage detection circuit provided by the invention.As shown in Figure 3, this circuit comprises bleeder circuit 1, on-off circuit 2, warning circuit 3 and detecting circuit 4.
On-off circuit 2 comprises a control end and two links.On-off circuit 2 is connected between warning circuit 3 and ground by link, and on-off circuit 2 directly connects bleeder circuit 1 or is connected to bleeder circuit 1 by detecting circuit 4 by control end.
Preferably, on-off circuit 2 is one-way SCRs.Adopt one-way SCR as on-off circuit 2, can only allow electric current to flow to ground from warning circuit 3, and not allow electric current to flow to warning circuit 3 from the bleeder circuit 1 of same ground connection.And when circuit was not worked, one-way SCR was in off-state, and the working power of circuit is cut off, and did not therefore need additionally to arrange power switch again.
Detecting circuit 4 is connected between bleeder circuit 1 and on-off circuit 2, plays the effect of filtering.
Preferably, detecting circuit 4 can comprise diode 41.The positive pole of diode 41 is connected to the common node of the first resistance 11 and the second resistance 12, and the negative pole of diode 41 is connected to control end and the ground of on-off circuit 2.Diode 41 can allow the electric current way flow mistake from bleeder circuit 1, but does not allow the current direction bleeder circuit 1 from warning circuit 3 and on-off circuit 2.
More preferably, detecting circuit 4 can also comprise detection electric capacity 42.One end of detection electric capacity 42 is connected to ground, and the other end of detection electric capacity 42 is connected to the negative pole of diode 41.Detection electric capacity 42 further filtering from the electric current of warning circuit 3 and on-off circuit 2.
Referring to Fig. 4, be the 4th example structure schematic diagram of electric-leakage detection circuit provided by the invention.Fig. 4 is the more specifically description to the electric-leakage detection circuit shown in Fig. 1-3.As shown in Figure 4, this circuit can comprise bleeder circuit 1, on-off circuit 2 and warning circuit 3, can also optionally comprise detecting circuit 4.
Wherein, warning circuit 3 can comprise phonation circuit 31, and when on-off circuit 2 conducting, phonation circuit 31 energisings are reported to the police thereby generate alarm sound.
Preferably, phonation circuit 31 can comprise connected resonant circuit 311 and loudspeaker 312.Resonant circuit 311 provides oscillating current can for loudspeaker 312.
More preferably, referring to Fig. 5.Described resonant circuit 311 comprises the 3rd resistance R 3, the second triode VT2 and the second capacitor C 2, the second triode VT2 is the NPN pipe, the base stage of the second triode VT2 is connected to positive source by the 3rd resistance R 3, the collector of the second triode VT2 is connected to positive source, the emitter of the second triode VT2 is connected to ground by on-off circuit 2, and the emitter of the second triode VT2 also is connected to ground by the second capacitor C 2, loudspeaker 312 and on-off circuit 1 successively.
In addition, phonation circuit 31 can also comprise driving circuit 313.Driving circuit 313 can be connected between positive source and loudspeaker 312, for loudspeaker 312 provide drive current.
Preferably, referring to Fig. 5, driving circuit 313 can comprise the first triode VT1, and VT1 is the PNP pipe, and the base stage of VT1 is connected to the collector of VT2, and the emitter of VT1 is connected to positive source, and the collector of VT1 is connected to ground by loudspeaker 312 and on-off circuit 1 successively.
More preferably, referring to Fig. 5, according to those skilled in the art's working experience, the base stage of VT1 can also be connected to ground by the first capacitor C 1 and on-off circuit 1 successively, this first capacitor C 1 can play the effect of filtering.
Although Fig. 4 shows a concrete structure of warning circuit 3, the present invention is not limited to this.It will be appreciated by those skilled in the art that warning circuit 3 can also comprise the circuit structure to User Alarms of being used for of any appropriate such as illuminating circuit.Warning circuit 3 can also be combined with software code, such as send audio alert etc. when on-off circuit 2 is communicated with.
Referring to Fig. 5, be the 5th embodiment circuit diagram of electric-leakage detection circuit provided by the invention.As shown in Figure 5, this circuit is comprised of bleeder circuit, on-off circuit, warning circuit and detecting circuit four parts, and by carrying powered battery, the positive pole of battery connects positive source, the minus earth of battery.
In the loop that the electron devices such as battery, resistance R 3, VT2, VT1, loudspeaker and SCR consist of, VT1 is the PNP pipe, VT2 is the NPN pipe, the base stage of the second triode VT2 is connected to positive source by resistance R 3, the collector of the second triode VT2 is connected to the base stage of the first triode VT1, the emitter of the second triode VT2 is connected to ground by SCR, and the emitter of VT2 also is connected to ground by capacitor C 2, loudspeaker and SCR successively.By capacitor C 1 and SCR ground connection, the emitter of VT1 directly connects positive source to the base stage of the first triode VT1 successively, and the collector of VT1 is successively by loudspeaker and SCR ground connection.
In the course of the work, enclosure interface is connected to electric appliance casing, if electric equipment insulation is good, shell is not charged, and bleeder circuit two ends no-voltage namely can not produce electrical leakage voltage on the common node of R1 and R2, and at this moment SCR disconnects, no current in circuit.If electric equipment earth fault, outer casing electrification will produce electrical leakage voltage on the common node of R1 and R2, and after C3 filtering, electrical leakage voltage is applied to the control end of unidirectional controllable silicon S CR, when electrical leakage voltage reaches alarm threshold value, and the SCR one-way conduction.VT2, VT1 conducting respectively, battery provides drive current by VT1 to loudspeaker, capacitor C 2 begins charging simultaneously, when the voltage on C2 reaches certain value, and the VT2 cut-off, C2 will be by the emitter discharge of VT2, during to certain value, VT2 is conducting again, again C2 is charged when the voltage drop on C2, so circulation repeatedly, produces oscillating current and makes loudspeaker generation alerting signal carry out sounding.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to complete by computer program, described program can be stored in a computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, one of ordinary skill in the art will appreciate that all or part of flow process that realizes above-described embodiment, and according to the equivalent variations that claim of the present invention is done, still belong to the scope that invention is contained.
Claims (10)
1. an electric-leakage detection circuit, by enclosure interface connecting circuit shell, is characterized in that, described electric-leakage detection circuit comprises:
Bleeder circuit is connected between described enclosure interface and ground, and described bleeder circuit is used for detecting the electrical leakage voltage that described electric appliance casing produces when described enclosure interface is connected to electric appliance casing;
On-off circuit, the control end of described on-off circuit is connected with described bleeder circuit, the conducting when electrical leakage voltage that described on-off circuit produces at described bleeder circuit reaches alarm threshold value;
Warning circuit is connected between described on-off circuit and positive source, is used for generating alerting signal and reports to the police when described on-off circuit conducting.
2. electric-leakage detection circuit according to claim 1, is characterized in that, described bleeder circuit comprises the first resistance and second resistance of series connection successively, and the common node of described the first resistance and the second resistance is connected to the control end of described on-off circuit.
3. electric-leakage detection circuit according to claim 2, is characterized in that, described electric-leakage detection circuit also comprises detecting circuit, and described detecting circuit is connected between the common node and described on-off circuit of described the first resistance and the second resistance.
4. electric-leakage detection circuit according to claim 3, it is characterized in that, described detecting circuit comprises diode, and the positive pole of described diode is connected to the common node of described the first resistance and described the second resistance, and the negative pole of described diode is connected to control end and the ground of described on-off circuit.
5. electric-leakage detection circuit according to claim 4, is characterized in that, described detecting circuit also comprises detection electric capacity, and an end of described detection electric capacity is connected to ground, and the other end of described detection electric capacity is connected to the negative pole of described diode.
6. electric-leakage detection circuit according to claim 5, is characterized in that, described warning circuit comprises phonation circuit, and described phonation circuit generates alarm sound when described on-off circuit conducting.
7. electric-leakage detection circuit according to claim 6, is characterized in that, described phonation circuit comprises connected resonant circuit and loudspeaker, and described resonant circuit provides oscillating current for described loudspeaker.
8. electric-leakage detection circuit according to claim 7, it is characterized in that, described resonant circuit comprises the 3rd resistance, the second triode and the second electric capacity, described the second triode is the NPN pipe, the base stage of described the second triode is connected to positive source by described the 3rd resistance, the collector of described the second triode is connected to described positive source, the emitter of described the second triode is connected to ground by described on-off circuit, and the emitter of described the second triode also is connected to ground by described the second electric capacity, described loudspeaker and described on-off circuit successively.
9. electric-leakage detection circuit according to claim 8, is characterized in that, described phonation circuit also comprises driving circuit, and described driving circuit is connected between described positive source and described loudspeaker, for described loudspeaker provide drive current.
10. the described electric-leakage detection circuit of any one according to claim 1-9, is characterized in that, described on-off circuit comprises one-way SCR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104356238A CN103176093A (en) | 2011-12-23 | 2011-12-23 | Leakage detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104356238A CN103176093A (en) | 2011-12-23 | 2011-12-23 | Leakage detection circuit |
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| CN103176093A true CN103176093A (en) | 2013-06-26 |
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| CN2011104356238A Pending CN103176093A (en) | 2011-12-23 | 2011-12-23 | Leakage detection circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606717A (en) * | 2013-12-04 | 2014-02-26 | 东莞市东颂电子有限公司 | Anti-electric shock charging method and detection adapter with floating voltage detection function |
| CN104566147A (en) * | 2014-12-22 | 2015-04-29 | 贵州中南交通科技有限公司 | Driveway foglight with solar panel and alarm apparatus |
| CN104678142A (en) * | 2015-03-18 | 2015-06-03 | 国网辽宁省电力有限公司丹东供电公司 | Automatic safety warning circuit of electric energy metering box |
| WO2016078536A1 (en) * | 2014-11-18 | 2016-05-26 | 广州市巽腾信息科技有限公司 | Receptacle capable of detecting external leakage voltage |
| CN109459708A (en) * | 2018-12-18 | 2019-03-12 | 广东原点智能技术有限公司 | Numerically-controlled machine tool power supply alarm circuit |
| CN109959834A (en) * | 2017-12-14 | 2019-07-02 | 中国石油天然气股份有限公司 | Electric leakage detection device |
| WO2021027832A1 (en) * | 2019-08-12 | 2021-02-18 | 中兴通讯股份有限公司 | Alarm apparatus and system for poor grounding |
| CN116540148A (en) * | 2023-07-06 | 2023-08-04 | 江苏展芯半导体技术有限公司 | Leakage test circuit of TBU device under high pressure |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606717A (en) * | 2013-12-04 | 2014-02-26 | 东莞市东颂电子有限公司 | Anti-electric shock charging method and detection adapter with floating voltage detection function |
| WO2016078536A1 (en) * | 2014-11-18 | 2016-05-26 | 广州市巽腾信息科技有限公司 | Receptacle capable of detecting external leakage voltage |
| CN104566147A (en) * | 2014-12-22 | 2015-04-29 | 贵州中南交通科技有限公司 | Driveway foglight with solar panel and alarm apparatus |
| CN104678142A (en) * | 2015-03-18 | 2015-06-03 | 国网辽宁省电力有限公司丹东供电公司 | Automatic safety warning circuit of electric energy metering box |
| CN109959834A (en) * | 2017-12-14 | 2019-07-02 | 中国石油天然气股份有限公司 | Electric leakage detection device |
| CN109459708A (en) * | 2018-12-18 | 2019-03-12 | 广东原点智能技术有限公司 | Numerically-controlled machine tool power supply alarm circuit |
| WO2021027832A1 (en) * | 2019-08-12 | 2021-02-18 | 中兴通讯股份有限公司 | Alarm apparatus and system for poor grounding |
| CN116540148A (en) * | 2023-07-06 | 2023-08-04 | 江苏展芯半导体技术有限公司 | Leakage test circuit of TBU device under high pressure |
| CN116540148B (en) * | 2023-07-06 | 2023-09-05 | 江苏展芯半导体技术有限公司 | Leakage test circuit of TBU device under high pressure |
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Application publication date: 20130626 |