CN105811366A - Remote power supply earth leakage protection circuit - Google Patents
Remote power supply earth leakage protection circuit Download PDFInfo
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- CN105811366A CN105811366A CN201610138534.XA CN201610138534A CN105811366A CN 105811366 A CN105811366 A CN 105811366A CN 201610138534 A CN201610138534 A CN 201610138534A CN 105811366 A CN105811366 A CN 105811366A
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- electric leakage
- power supply
- remote power
- unit
- leakage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a remote power supply earth leakage protection circuit, and the circuit comprises an electric leakage detection unit, an electric leakage regulating unit, an electric leakage feedback unit, an electric leakage control unit and an electric leakage protection unit. The electric leakage detection unit acquires an electric leakage signal of a remote power supply; the electric leakage regulating unit receives the electric leakage signal detected by the electric leakage detection unit, the sensitivity of the electric leakage signal is regulated, and the signal is outputted to the electric leakage feedback unit; the electric leakage feedback unit transmits the electric leakage signal to the electric leakage control unit; the electric leakage control unit analyzes if the electric leakage signal has phenomenon of surge or electric leakage, and the corresponding protection action is performed according to the analysis result; and the electric leakage protection unit protects the circuit of the remote power supply according to the generated electric leakage signal. The circuit has few electric components, and the judgment accuracy is improved by combining software, so that the safe operation of the remote power supply can be effectively ensured.
Description
Technical field
The present invention relates to power protecting circuit, particularly relate to the leakage protection circuit of Remote Power Supply.
Background technology
Remote Power Supply is that the power supply-48VDC of central machine room transforms to 208V/380VDC output, it is transferred to remote equipment through private cable, unidirectional current can be changed into available alternating current with contravariant equipment or be depressured to-48V with DC source thus realizing remote power feeding by far-end, below figure direct-current remote feeding power adopts floating power supply, namely voltage output suspends with the earth, thus too increasing safety, also improve lightning protection capability.Remote Power Supply all have employed stream, overvoltage technology, when detecting that equipment output overcurrent or overvoltage equipment will be automatically switched off output, improves device security.Remote Power Supply additionally uses short-circuit protection, open-circuit-protection, earth leakage protective, forceful electric power overlap joint resist technology, thus improve the safety of circuit.
And the current earth leakage protective in Remote Power Supply, majority utilizes sampling resistor to gather electric current formed voltage signal, and as the input of the late-class circuits such as amplifier, this mode causes circuit extremely complex, adds the probability of component failure risk.The speed underaction of protection during another one problem, otherwise too fast, it is easy to cause misoperation under the disturbed conditions such as surge, otherwise not prompt enough, affect earth leakage protective safety.
Summary of the invention
The present invention is to solve the technical problem existed in above-mentioned prior art, it is proposed to a kind of Remote Power Supply leakage protection circuit, including detection of electrical leakage unit, electric leakage regulon, electric leakage feedback unit, electric leakage control unit and residual current protective unit.
Described detection of electrical leakage unit obtains the electric leakage signal of Remote Power Supply；
Described electric leakage regulon receives the electric leakage signal that detection of electrical leakage unit detects, the sensitivity of electric leakage signal is adjusted, and exports to electric leakage feedback unit；
Electric leakage signal is transferred to electric leakage control unit by described electric leakage feedback unit；
It is surge phenomenon or leaky that described electric leakage control unit analyzes electric leakage signal, carries out corresponding protection act according to analyzing result；
The circuit of Remote Power Supply is protected by described residual current protective unit for the electric leakage signal produced.
In the technical program, described electric leakage regulon adjusts the output to the electric current of electric leakage feedback unit thus realizing the sensitivity of electric leakage signal is adjusted.
In the detail of the technical program, described residual current protective unit is critesistor, and described critesistor is connected (line of mains neutral point N and load neutral point N', is called center line in symmetrical three-phase and four-line circuit) with simulation center line and the protecting field of Remote Power Supply.Described detection of electrical leakage unit is the two-way TVS pipe connected with described critesistor, and one end of described two-way TVS pipe connects the simulation center line of Remote Power Supply, and the other end of two-way TVS pipe connects critesistor.Described electric leakage regulon is the resistance in parallel with two-way TVS pipe.Described electric leakage feedback unit includes the two-way TVS pipe with described resistant series, and receives TVS pipe signal and be transferred to the audion of electric leakage control unit by colelctor electrode.Described electric leakage control unit is digital signal processor, when described digital signal processor receives electric leakage signal, acquiescence is judged to surge phenomenon, the pulse of block certain time length, continue to judge whether surge phenomenon occurs again, if surge phenomenon continuous several times occurs, then it is judged to leaky, restarts far end supply.
The concrete condition of electric leakage is analyzed judging in conjunction with software by the present invention by two-way TVS pipe; the motility not only protected is able to great raising; simultaneously; owing to the number of electronic devices and components is few; be components and parts or the maintenance of software also all very simple; achieve under the premise that system does not reset under ensureing the operating modes such as surge, creepage protection function is the most quickly provided.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the present invention；
Fig. 2 is the circuit diagram of the present invention.
Detailed description of the invention
It is described in detail below in conjunction with the accompanying drawing structure to the present invention and principle.
As it is shown in figure 1, Remote Power Supply leakage protection circuit provided by the invention, including detection of electrical leakage unit, electric leakage regulon, electric leakage feedback unit, electric leakage control unit and residual current protective unit.
When there being electric leakage to occur, detection of electrical leakage unit can catch the electric leakage signal of Remote Power Supply outfan, and meanwhile, the circuit of Remote Power Supply is protected by residual current protective unit for the electric leakage signal produced, the further increase of restriction leakage current.Electric leakage regulon receives the electric leakage signal that detection of electrical leakage unit detects, controls to be given to the size of the electric current of electric leakage feedback unit, thus regulating the sensitivity of electric leakage signal, and exports to electric leakage feedback unit.Electric leakage signal is transferred to electric leakage control unit by electric leakage feedback unit, and it is surge phenomenon or leaky that electric leakage control unit analyzes electric leakage signal, carries out corresponding protection act according to analyzing result, for instance close, restart power supply etc..
As shown in Figure 2; the concrete electronic devices and components that Remote Power Supply leakage protection circuit provided by the invention adopts are few, specifically include: two-way TVS pipe D101, critesistor PTC, resistance R101, two-way TVS pipe and the electric leakage feedback unit U101 of audion composition, audion, resistance R102, digital signal processor DSP.
Wherein, two-way TVS pipe D101 and critesistor PTC series connection, one end of two-way TVS pipe D101 connects the simulation center line (LINE) of Remote Power Supply, another termination critesistor PTC, then critesistor PTC ground connection (PGND) of two-way TVS pipe D101.After resistance R101 connects with electric leakage feedback unit U101, then in parallel with two-way TVS pipe D101.Two-way TVS pipe one terminating resistor in electric leakage feedback unit U101, another terminates two-way TVS pipe D101, then output optical signal is to the base stage of audion, and the colelctor electrode of audion connects digital signal processor DSP, is connected with on and off switch DC_SOURCE also by resistance R102 simultaneously.
When electric leakage occurs; the positive pole of Remote Power Supply outfan/high pressure occurs between negative pole and PGND, critesistor, can along with positive pole/increase of voltage between negative pole and PGND as residual current protective unit; critesistor PTC resistor also increases, and limits the further increase of leakage current.Simultaneously; with the critesistor PTC two-way TVS pipe D101 being cascaded, the electric leakage signal detected is given to electric leakage feedback unit U101 by resistance R101; by regulating the size of resistance R101; can control to be given to the size of the electric current of electric leakage feedback unit, it is achieved thereby that control the sensitivity of earth leakage protective action.Electric leakage signal is given to the digital signal processor DSP of electric leakage control unit by electric leakage feedback unit by resistance R102, the comprehensive various signals of digital signal processor DSP, judge whether electric leakage signal is electric leakage or surge, and process accordingly according to the result after judging, carry out closing power supply, restarting the actions such as power supply.Occur if digital signal processor DSP is judged as YES surge, then will not restart far end supply, simply temporarily block the pulse of 2ms, then proceed to judge whether surge situation occurs, if continuous four times yet suffer from drain conditions, then judging it is actual electric leakage, not being surge, thus closing whole power-supply system.Algorithm by hardware detection and software, it is achieved that the quickly protection Surge handling capability simultaneously under drain conditions is also improved.
Embodiments above is only in order to illustrate the structure of the present invention, and those of ordinary skill in the art can make various deformation and change under the design of the present invention, and these deformation and change are included within protection scope of the present invention.
Claims (7)
1. a Remote Power Supply leakage protection circuit, it is characterised in that include detection of electrical leakage unit, electric leakage regulon, electric leakage feedback unit, electric leakage control unit and residual current protective unit；
Described detection of electrical leakage unit obtains the electric leakage signal of Remote Power Supply；
Described electric leakage regulon receives the electric leakage signal that detection of electrical leakage unit detects, the sensitivity of electric leakage signal is adjusted, and exports to electric leakage feedback unit；
Electric leakage signal is transferred to electric leakage control unit by described electric leakage feedback unit；
It is surge phenomenon or leaky that described electric leakage control unit analyzes electric leakage signal, carries out corresponding protection act according to analyzing result；
The circuit of Remote Power Supply is protected by described residual current protective unit for the electric leakage signal produced.
2. Remote Power Supply leakage protection circuit as claimed in claim 1, it is characterised in that described electric leakage regulon adjusts the output to the electric current of electric leakage feedback unit thus realizing the sensitivity of electric leakage signal is adjusted.
3. Remote Power Supply leakage protection circuit as claimed in claim 1, it is characterised in that described residual current protective unit is critesistor, and described critesistor is connected with protecting field with the simulation center line of Remote Power Supply.
4. Remote Power Supply leakage protection circuit as claimed in claim 3; it is characterized in that; described detection of electrical leakage unit is the two-way TVS pipe connected with described critesistor, and one end of described two-way TVS pipe connects the simulation center line of Remote Power Supply, and the other end of two-way TVS pipe connects critesistor.
5. Remote Power Supply leakage protection circuit as claimed in claim 4, it is characterised in that described electric leakage regulon is the resistance in parallel with two-way TVS pipe.
6. Remote Power Supply leakage protection circuit as claimed in claim 5, it is characterised in that described electric leakage feedback unit includes the two-way TVS pipe with described resistant series, and receives TVS pipe signal and be transferred to the audion of electric leakage control unit by colelctor electrode.
7. Remote Power Supply leakage protection circuit as claimed in claim 6; it is characterized in that; described electric leakage control unit is digital signal processor; when described digital signal processor receives electric leakage signal, acquiescence is judged to surge phenomenon, the pulse of block certain time length; continue to judge whether surge phenomenon occurs again; if surge phenomenon continuous several times occurs, then it is judged to leaky, restarts far end supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610138534.XA CN105811366B (en) | 2016-03-11 | 2016-03-11 | A kind of Remote Power Supply leakage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610138534.XA CN105811366B (en) | 2016-03-11 | 2016-03-11 | A kind of Remote Power Supply leakage protection circuit |
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| Publication Number | Publication Date |
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| CN105811366A true CN105811366A (en) | 2016-07-27 |
| CN105811366B CN105811366B (en) | 2018-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610138534.XA Active CN105811366B (en) | 2016-03-11 | 2016-03-11 | A kind of Remote Power Supply leakage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541287A (en) * | 2018-12-29 | 2019-03-29 | 天津康途科技有限公司 | A kind of leak current detection device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102042A (en) * | 2007-08-03 | 2008-01-09 | 中兴通讯股份有限公司 | A protection device for lightning strike surge protection circuit |
| CN102237678A (en) * | 2010-04-30 | 2011-11-09 | 深圳市锦龙通信技术有限公司 | Direct-current remote feeding power system |
| CN202362413U (en) * | 2011-12-07 | 2012-08-01 | 深圳市嘉世通科技有限公司 | High-voltage direct-current remote power supply start-up detecting device |
| US20130113453A1 (en) * | 2011-11-03 | 2013-05-09 | General Electric Company | Earth leakage power supply with bypass |
| CN103795029A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Leakage current detection protection circuit of direct-current remote supply power system |
| CN105006815A (en) * | 2015-08-13 | 2015-10-28 | 中国石油化工股份有限公司 | Method for designing lightening circuit breaker based on thermistor transmitter |
-
2016
- 2016-03-11 CN CN201610138534.XA patent/CN105811366B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102042A (en) * | 2007-08-03 | 2008-01-09 | 中兴通讯股份有限公司 | A protection device for lightning strike surge protection circuit |
| CN102237678A (en) * | 2010-04-30 | 2011-11-09 | 深圳市锦龙通信技术有限公司 | Direct-current remote feeding power system |
| US20130113453A1 (en) * | 2011-11-03 | 2013-05-09 | General Electric Company | Earth leakage power supply with bypass |
| CN202362413U (en) * | 2011-12-07 | 2012-08-01 | 深圳市嘉世通科技有限公司 | High-voltage direct-current remote power supply start-up detecting device |
| CN103795029A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Leakage current detection protection circuit of direct-current remote supply power system |
| CN105006815A (en) * | 2015-08-13 | 2015-10-28 | 中国石油化工股份有限公司 | Method for designing lightening circuit breaker based on thermistor transmitter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541287A (en) * | 2018-12-29 | 2019-03-29 | 天津康途科技有限公司 | A kind of leak current detection device |
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| CN105811366B (en) | 2018-12-18 |
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Address after: 518000, 5 floor, Fengyun mansion, five road north, Nanshan District science and Technology Park, Shenzhen, Guangdong Applicant after: Shenzhen Vmax Power Co., Ltd. Address before: 518000, 4 floor, Fengyun mansion, five road north, Nanshan District science and Technology Park, Shenzhen, Guangdong Applicant before: Shenzhen Vmax Power Co., Ltd. |
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Address after: 518000, 5 floor, Fengyun mansion, five road north, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee after: Shenzhen Weimei New Energy Co., Ltd. Address before: 518000, 5 floor, Fengyun mansion, five road north, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: Shenzhen Vmax Power Co., Ltd. |