CN102338838A - Creepage detection circuit - Google Patents
Creepage detection circuit Download PDFInfo
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- CN102338838A CN102338838A CN2010102383202A CN201010238320A CN102338838A CN 102338838 A CN102338838 A CN 102338838A CN 2010102383202 A CN2010102383202 A CN 2010102383202A CN 201010238320 A CN201010238320 A CN 201010238320A CN 102338838 A CN102338838 A CN 102338838A
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- electric
- voltage
- detection circuit
- bidirectional thyristor
- leakage detection
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Abstract
The invention provides a creepage detection circuit. The creepage detection circuit comprises a rectifying branch circuit, a capacitor, a bidirectional thyristor and an alarm module, wherein the rectifying branch circuit is electrically coupled to an equipment casing and consists of a resistor and a diode which are serially connected with each other; one electrode of the capacitor is electrically coupled to the rectifying branch circuit, and the other electrode of the capacitor is electrically coupled to the zero line end of a power socket; the bidirectional thyristor is electrically coupled to the capacitor; and the alarm module is electrically coupled to the capacitor and the bidirectional thyristor. When the equipment casing has a creepage phenomenon, the capacitor executes circulating operation of charging, discharging and recharging; and when voltage at the two ends of the capacitor is more than or equal to starting voltage of the bidirectional thyristor, the bidirectional thyristor is switched on and the alarm module outputs an alarm signal. After adoption of the creepage detection circuit, when the equipment casing has the creepage phenomenon, creepage voltage charges the capacitor, and when the voltage at the two ends of the capacitor is more than or equal to the starting voltage of the bidirectional thyristor, the bidirectional thyristor is switched on and the alarm module outputs the alarm signal, so that an operator is protected from personal injury caused by creepage of the casing.
Description
Technical field
The present invention relates to the detection of electrical leakage of multiple electrical equipment, relate in particular to a kind of electric-leakage detection circuit that adopts the discrete component design.
Background technology
Along with the raising and the science and technology development of living standard, more and more obtained using widely, to realize various function such as large industry equipment such as server and home appliance with professional use.With the home appliance is example, has especially obtained users' common favor, and people can be freed from heavy manual labor.Usually, these home appliances all adopt the civilian three-phase alternating-current supply of 220V to 380V, when the attaching plug of equipment correctly is connected with power supply base, just can let the equipment operate as normal.
Yet a lot of home appliances all adopt metal material as shell, if the device housings electric leakage when electrical leakage voltage is higher than the human safety voltage, just probably causes life danger.In the prior art, when using these equipment, people can not take voltage table go the measuring equipment shell whether electrical leakage voltage is arranged, and the whether entail dangers to personal safety of the size of electrical leakage voltage.In addition, these home appliances also rarely have detection of electrical leakage and warning circuit.
In view of this, how effectively whether the real-time watch device shell leaks electricity, thereby and when leaky occurring necessarily output alarm signal remind to use the operator of server apparatus or household electrical appliance to take care, be the problem that the designer needs solution badly.
Summary of the invention
To in the prior art such as main equipment or the existing in use above-mentioned defectives of household electrical appliance such as servers, the invention provides a kind of novel electric-leakage detection circuit, this circuit can be discerned electrical leakage voltage quickly and easily, and sends alerting signal.
According to an aspect of the present invention, a kind of electric-leakage detection circuit is provided, this electric-leakage detection circuit is arranged between supply socket and the device housings to be detected, comprising:
One rectification branch road is connected in series by a resistance and a diode and forms, and this rectification branch road electrical couplings is to device housings;
One electric capacity, one of which utmost point electrical couplings is to the rectification branch road, the zero line side of another utmost point electrical couplings to supply socket;
One two-way thyristor, electrical couplings is to electric capacity; And
One alarm module, electrical couplings to electric capacity and bidirectional thyristor,
Wherein, when device housings leaked electricity, electric capacity was carried out charging, discharge and the cycling of charging once more, and at the voltage at electric capacity two ends during more than or equal to the cut-in voltage of bidirectional thyristor, bidirectional thyristor conducting and alarm module output alarm signal.
Preferably, after the bidirectional thyristor conducting, electric capacity is carried out discharge operation, and when the voltage at electric capacity two ends was less than or equal to the cut-off voltage of bidirectional thyristor, bidirectional thyristor turn-offed, and the electrical leakage voltage between device housings and the supply socket zero line side charges to electric capacity once more.And the cut-in voltage of this bidirectional thyristor is not more than 36V, and the cut-off voltage of bidirectional thyristor is not less than 12V.
Preferably, between electric-leakage detection circuit and device housings, a switch is set between electric-leakage detection circuit and supply socket perhaps, to start or to close electric-leakage detection circuit.
According to one embodiment of the invention, alarm module is the parallelly connected branch road light emitting diode that is connected in series, and wherein parallel branch is formed by a current-limiting resistance and hummer parallel connection.
According to another embodiment of the present invention, alarm module is the parallel branch that is formed by a current-limiting resistance and hummer parallel connection.
According to an embodiment more of the present invention, alarm module is the series arm that is formed by a current-limiting resistance and light emitting diode series connection.
Preferably, the cut-in voltage and the difference between the cut-off voltage of bidirectional thyristor are big more, and the capacitance discharges process is slow more, and then the interval time of adjacent twice alarm signal is long more.
Adopt electric-leakage detection circuit of the present invention, when electric leakage took place device housings, electrical leakage voltage charged to electric capacity, and at the voltage at electric capacity two ends during more than or equal to the cut-in voltage of bidirectional thyristor, the bidirectional thyristor conducting, alarm module sends alarm signal.In addition; Electric capacity is in the process of discharge gradually; When voltage was reduced under cut-off voltage or this cut-off voltage of bidirectional thyristor, bidirectional thyristor turn-offed, and electrical leakage voltage charges to electric capacity once more; So that alarm module is exported alarm signal constantly according to certain time interval, cause personal injury because of body leakage to prevent the operator.
Description of drawings
The reader with reference to advantages after the embodiment of the present invention, will become apparent various aspects of the present invention.Wherein,
Fig. 1 illustrates according to one embodiment of the invention, is arranged at the schematic block diagram of the electric-leakage detection circuit between device housings and the supply socket; And
Fig. 2 illustrates the principle schematic of electric-leakage detection circuit as shown in Figure 1.
Embodiment
With reference to the accompanying drawings, specific embodiments of the invention is done further to describe in detail.
Fig. 1 illustrates according to one embodiment of the invention, is arranged at the schematic block diagram of the electric-leakage detection circuit between device housings and the supply socket.With reference to Fig. 1, electric-leakage detection circuit 12 is between device housings 10 and supply socket 14, and this electric-leakage detection circuit 12 comprises rectification branch road 120, electric capacity 121, bidirectional thyristor 123 and alarm module 125.Wherein, The duty of electric capacity 121 is distinguished charging process and discharge process substantially; When electric leakage took place between device housings 10 and the supply socket 14, the electrical leakage voltage after overcommutation branch road 120 carries out rectification began electric capacity 121 chargings, when electric capacity 121 charging processes last till its voltage more than or equal to the cut-in voltage of bidirectional thyristor 123; Bidirectional thyristor 123 conductings, alarm module 125 sends alarm signal.
Bidirectional thyristor 123 has two threshold voltages, that is, cut-in voltage and cut-off voltage, when the voltage between the respective electrode that puts on bidirectional thyristor is greater than or equal to cut-in voltage, the bidirectional thyristor conducting; When the voltage between the respective electrode that puts on bidirectional thyristor was less than or equal to cut-off voltage, bidirectional thyristor turn-offed.Those of ordinary skill in the art is to be understood that; Can set or dispose the threshold voltage of bidirectional thyristor 123 according to the human safety voltage, for example, according to one embodiment of the invention; The cut-in voltage of bidirectional thyristor 123 is set at 36V, and cut-off voltage is set at 12V.In addition, alarm module 125 sends alarm signal and notices that to remind the operator leaky has appearred in device housings after bidirectional thyristor 123 conductings.
In order to further specify the principle of work of the electric-leakage detection circuit among the present invention, Fig. 2 illustrates the circuit diagram of electric-leakage detection circuit as shown in Figure 1.Please be simultaneously with reference to figure 1 and Fig. 2; The attaching plug of equipment is connected to supply socket, and E node is wherein represented ground terminal, and the N node is represented zero terminal; The L node is represented fire line terminal, electric-leakage detection circuit is arranged between the zero terminal of device housings and supply socket.For the purpose of being convenient to describe, might as well cut-in voltage and the cut-off voltage of bidirectional thyristor D2 be called Vo and Vc respectively.
When electric leakage takes place device housings, at first carry out rectification and handle via 120 pairs of electrical leakage voltages of rectification branch road.For example, the rectification branch road 120 of Fig. 2 is connected in series with diode D1 by resistance R 1 and forms, and rectification branch road 120 electrical couplings are to device housings 10.Then, the electrical leakage voltage of rectification can charge to the capacitor C among the figure, and this moment, the voltage of capacitor C two interpolars increased gradually; And at voltage across poles during more than or equal to Vo; Bidirectional thyristor D2 conducting, alarm module 125 sends alarm signal, in present embodiment; This alarm module 125 is for example formed by being connected in series with light emitting diode D3 after current-limiting resistance R2 and the hummer P parallel connection again; Hummer P sends chimes of doom after bidirectional thyristor D2 conducting, and light emitting diode D3 light-emitting flash plays the effect of strengthening caution simultaneously.Then, capacitor C is because of bidirectional thyristor D2 conducting outwards discharge constantly, and this moment, voltage across poles reduced gradually; When voltage across poles is less than or equal to Vc; Bidirectional thyristor D2 turn-offs, and hummer P leaves from circuit interruption with light emitting diode D3 and is connected, and no longer exports alarm signal.Need particularly point out, the electrical leakage voltage that is present in this moment between device housings and the supply socket can be once more to the capacitor C charging, to repeat foregoing process; That is, the voltage of capacitor C two interpolars raises, bidirectional thyristor conducting once more when more than or equal to cut-in voltage Vo; Alarm module 125 sends alarm signal once more, as previously mentioned, and in present embodiment; Hummer P in the alarm module 125 sends chimes of doom, light emitting diode D3 light-emitting flash.
Can find out from the above-mentioned course of work of electric-leakage detection circuit; In case device housings generation leaky; Bidirectional thyristor D2 conducting constantly, by, conducting and ending once more once more; Correspondingly, alarm module 125 also can periodically just be exported alarm signal at regular intervals, thereby reminds operating personnel to prevent the harm of leaking electricity and being brought.Those of ordinary skill in the art should be appreciated that the cut-in voltage Vo of bidirectional thyristor D2 and the difference between the cut-off voltage Vc are big more, and the discharge process of capacitor C is slow more, and the interval time of so adjacent twice alarm signal is just long more.
In one embodiment of this invention; In order freely to start or close the measuring ability of electric-leakage detection circuit; Switch S 1 can be set between electric-leakage detection circuit and device housings; Switch S 2 perhaps is set, and when switch S 1 or S2 closure, electric-leakage detection circuit is monitored electrical leakage voltage in real time between electric-leakage detection circuit and supply socket.In addition, behind leaky generation and alarm module 125 output alarm signals, also can break off S1 or S2, no longer report to the police.
Those of ordinary skill in the art it should also be understood that; Though the alarm module 125 of preferred embodiment of the present invention has been described by means of Fig. 2; Promptly; Alarm module 125 adopts the circuit design that is connected in series with light emitting diode D3 again by after current-limiting resistance R2 and the hummer P parallel connection, but the present invention has more than and is confined to this.For example, in another embodiment of the present invention, alarm module 125 is the parallel branches that formed by current-limiting resistance R2 and hummer P parallel connection.In another embodiment of the present invention, alarm module 125 is the series arms that formed by current-limiting resistance R2 and light emitting diode D3 series connection.
In sum, adopt electric-leakage detection circuit of the present invention, when electric leakage takes place device housings; Electrical leakage voltage charges to electric capacity; And at the voltage at electric capacity two ends during more than or equal to the cut-in voltage of bidirectional thyristor, the bidirectional thyristor conducting, alarm module sends alarm signal.In addition; Electric capacity is in the process of discharge gradually; When voltage was reduced under cut-off voltage or this cut-off voltage of bidirectional thyristor, bidirectional thyristor turn-offed, and electrical leakage voltage charges to electric capacity once more; So that alarm module is exported alarm signal constantly according to certain time interval, cause personal injury because of body leakage to prevent the operator.
In the preceding text, illustrate and describe embodiment of the present invention.But those skilled in the art can understand, and under situation without departing from the spirit and scope of the present invention, can also specific embodiments of the invention do various changes and replacement.These changes and replacement all drop in claims of the present invention institute restricted portion.
Claims (8)
1. electric-leakage detection circuit, said electric-leakage detection circuit are arranged between supply socket and the device housings to be detected, it is characterized in that said electric-leakage detection circuit comprises:
One rectification branch road is connected in series by a resistance and a diode and forms, said rectification branch road electrical couplings to said device housings;
One electric capacity, a utmost point electrical couplings of said electric capacity to said rectification branch road, the zero line side of another utmost point electrical couplings to said supply socket;
One two-way thyristor, electrical couplings to said electric capacity; And
One alarm module, electrical couplings to said electric capacity and said bidirectional thyristor,
Wherein, When said device housings leaks electricity; Electric capacity is carried out charging, discharge and the cycling of charging once more, and at the voltage at electric capacity two ends during more than or equal to the cut-in voltage of bidirectional thyristor, bidirectional thyristor conducting and alarm module output alarm signal.
2. electric-leakage detection circuit as claimed in claim 1; It is characterized in that; After the said bidirectional thyristor conducting, electric capacity is carried out discharge operation, when the voltage at electric capacity two ends is less than or equal to the cut-off voltage of bidirectional thyristor; Bidirectional thyristor turn-offs, and the electrical leakage voltage between device housings and the supply socket zero line side charges to electric capacity once more.
3. electric-leakage detection circuit as claimed in claim 2 is characterized in that the cut-in voltage of said bidirectional thyristor is not more than 36V, and the cut-off voltage of said bidirectional thyristor is not less than 12V.
4. electric-leakage detection circuit as claimed in claim 1; It is characterized in that; Between said electric-leakage detection circuit and said device housings, perhaps between said electric-leakage detection circuit and said supply socket, a switch is set, to start or to close said electric-leakage detection circuit.
5. electric-leakage detection circuit as claimed in claim 1 is characterized in that, said alarm module is the parallelly connected branch road light emitting diode that is connected in series, and said parallel branch is formed by a current-limiting resistance and hummer parallel connection.
6. electric-leakage detection circuit as claimed in claim 1 is characterized in that, said alarm module is the parallel branch that is formed by a current-limiting resistance and hummer parallel connection.
7. electric-leakage detection circuit as claimed in claim 1 is characterized in that, said alarm module is the series arm that is formed by a current-limiting resistance and light emitting diode series connection.
8. electric-leakage detection circuit as claimed in claim 1 is characterized in that, the cut-in voltage and the difference between the cut-off voltage of said bidirectional thyristor are big more, and said capacitance discharges process is slow more, and then the interval time of adjacent twice alarm signal is long more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102383202A CN102338838A (en) | 2010-07-26 | 2010-07-26 | Creepage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102383202A CN102338838A (en) | 2010-07-26 | 2010-07-26 | Creepage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102338838A true CN102338838A (en) | 2012-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102383202A Pending CN102338838A (en) | 2010-07-26 | 2010-07-26 | Creepage detection circuit |
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| CN (1) | CN102338838A (en) |
Cited By (6)
| 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 |
| CN105572521A (en) * | 2014-10-09 | 2016-05-11 | 苏州益而益电器制造有限公司 | Ground wire live-line detection display circuit and electric device |
| CN109425802A (en) * | 2017-08-22 | 2019-03-05 | 华邦电子股份有限公司 | Leak current detection device and its detection method |
| 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 |
| CN112485591A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection live detection device |
| CN112834951A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
Citations (6)
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| US4207558A (en) * | 1978-04-03 | 1980-06-10 | Pittway Corporation | Interconnection circuit for a plurality of alarm units |
| EP0062461A1 (en) * | 1981-03-30 | 1982-10-13 | Bohumil Maria Jan Plichta | Alarm system |
| CN86201328U (en) * | 1986-03-17 | 1987-10-03 | 中国南通通环贸易开发实业公司 | Electric leakage-prood device |
| CN86209284U (en) * | 1986-11-24 | 1987-12-12 | 王勤 | All-part electricity leakage alarm |
| CN87203633U (en) * | 1987-03-10 | 1988-12-07 | 魏红斌 | Multi-functional sound (light) reporting device |
| CN2035903U (en) * | 1988-07-20 | 1989-04-12 | 北京市劳动保护科学研究所 | Single-phase low-voltage warner for current leakage |
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2010
- 2010-07-26 CN CN2010102383202A patent/CN102338838A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4207558A (en) * | 1978-04-03 | 1980-06-10 | Pittway Corporation | Interconnection circuit for a plurality of alarm units |
| EP0062461A1 (en) * | 1981-03-30 | 1982-10-13 | Bohumil Maria Jan Plichta | Alarm system |
| CN86201328U (en) * | 1986-03-17 | 1987-10-03 | 中国南通通环贸易开发实业公司 | Electric leakage-prood device |
| CN86209284U (en) * | 1986-11-24 | 1987-12-12 | 王勤 | All-part electricity leakage alarm |
| CN87203633U (en) * | 1987-03-10 | 1988-12-07 | 魏红斌 | Multi-functional sound (light) reporting device |
| CN2035903U (en) * | 1988-07-20 | 1989-04-12 | 北京市劳动保护科学研究所 | Single-phase low-voltage warner for current leakage |
Cited By (6)
| 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 |
| CN105572521A (en) * | 2014-10-09 | 2016-05-11 | 苏州益而益电器制造有限公司 | Ground wire live-line detection display circuit and electric device |
| CN109425802A (en) * | 2017-08-22 | 2019-03-05 | 华邦电子股份有限公司 | Leak current detection device and its detection method |
| 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 |
| CN112834951A (en) * | 2020-09-07 | 2021-05-25 | 青岛经济技术开发区海尔热水器有限公司 | Electric leakage detection circuit, electric leakage protection circuit and household appliance |
| CN112485591A (en) * | 2020-11-20 | 2021-03-12 | 贵州电网有限责任公司 | Distribution transformer earth connection live detection device |
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Application publication date: 20120201 |