CN105811366B - A kind of Remote Power Supply leakage protection circuit - Google Patents
A kind of Remote Power Supply leakage protection circuit Download PDFInfo
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- CN105811366B CN105811366B CN201610138534.XA CN201610138534A CN105811366B CN 105811366 B CN105811366 B CN 105811366B CN 201610138534 A CN201610138534 A CN 201610138534A CN 105811366 B CN105811366 B CN 105811366B
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- leakage
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- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 14
- 230000035945 sensitivity Effects 0.000 claims abstract description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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 kind of Remote Power Supply leakage protection circuits, including detection of electrical leakage unit, electric leakage to adjust unit, electric leakage feedback unit, electric leakage control unit and residual current protective unit.The detection of electrical leakage unit obtains the electric leakage signal of Remote Power Supply；The electric leakage adjusts unit and receives the electric leakage signal that detection of electrical leakage unit detects, the sensitivity of electric leakage signal is adjusted, and exports and give electric leakage feedback unit；Electric leakage signal is transferred to electric leakage control unit by the electric leakage feedback unit；Electric leakage control unit analysis electric leakage signal is surge phenomenon or leaky, carries out corresponding protection act based on the analysis results；The residual current protective unit protects the circuit of Remote Power Supply for the electric leakage signal generated.Electronic component of the invention is few, and the mode of software is combined to judge that precision improves, can be with the safe handling of effective guarantee Remote Power Supply.
Description
Technical field
The present invention relates to power protecting circuit more particularly to the leakage protection circuits of Remote Power Supply.
Background technique
Remote Power Supply is that the power supply -48VDC of central machine room is transformed to 208V/380VDC output, is transmitted through private cable
To remote equipment, distally with contravariant equipment direct current can be changed into available alternating current or be depressured to DC power supply-
48V is to realize remote power feeding, and if following figure direct-current remote feeding power uses floating power supply, i.e. voltage output and the earth suspends, from
And safety is also increased, also improve lightning protection capability.Remote Power Supply all uses overcurrent, over-voltage technology, when detecting equipment
Output will be automatically closed in output overcurrent or over-voltage equipment, improve device security.Remote Power Supply additionally use short-circuit protection,
Open-circuit-protection, earth leakage protective, forceful electric power overlap protection technique, to improve the safety of route.
And the earth leakage protective in Remote Power Supply, majority acquire electric current formed voltage signal using sampling resistor at present, make
For the input of the late-class circuits such as amplifier, this mode causes circuit extremely complex, increases the probability of component failure risk.In addition
The speed protected when one problem is inflexible or too fast, be easy to cause under the disturbed conditions such as surge malfunction or not enough
In time, earth leakage protective safety is influenced.
Summary of the invention
The present invention proposes a kind of Remote Power Supply earth leakage protective electricity to solve above-mentioned the technical problems existing in the prior art
Road, including detection of electrical leakage unit, electric leakage adjust unit, electric leakage feedback unit, electric leakage control unit and residual current protective unit.
The detection of electrical leakage unit obtains the electric leakage signal of Remote Power Supply；
The electric leakage adjusts unit and receives the electric leakage signal that detects of detection of electrical leakage unit, to the sensitivity of electric leakage signal into
Row is adjusted, and is exported and given electric leakage feedback unit；
Electric leakage signal is transferred to electric leakage control unit by the electric leakage feedback unit；
Electric leakage control unit analysis electric leakage signal is surge phenomenon or leaky, is carried out based on the analysis results
Corresponding protection act；
The residual current protective unit protects the circuit of Remote Power Supply for the electric leakage signal generated.
In the technical scheme, the electric leakage adjusts unit and adjusts the output to the electric current of electric leakage feedback unit to realization pair
The sensitivity of electric leakage signal is adjusted.
In the detail of the technical program, the residual current protective unit is thermistor, the thermistor and remote confession
The simulation middle line of power supply connects (in the symmetrical three-phase and four-line circuit company of mains neutral point N and load neutral point N' with protecting field
Line is called middle line).The detection of electrical leakage unit be with the concatenated two-way TVS pipe of the thermistor, the two-way TVS pipe
One end connects the simulation middle line of Remote Power Supply, and the other end of two-way TVS pipe connects thermistor.The electric leakage adjust unit be with
The resistance of two-way TVS pipe parallel connection.The electric leakage feedback unit includes and the concatenated two-way TVS pipe of the resistance, and receives TVS
Pipe signal and the triode that electric leakage control unit is transferred to by collector.The electric leakage control unit is Digital Signal Processing
Device, when the digital signal processor receives electric leakage signal, default is determined as surge phenomenon, blocks the pulse of certain time length,
Continue to judge whether surge phenomenon occurs again, if surge phenomenon continuous several times occur, be determined as leaky, restarts distal end
Power supply.
The present invention analyzes and determines the concrete condition of electric leakage by two-way TVS pipe combination software, the spirit not only protected
Activity is greatly improved, simultaneously as the number of electronic component is few, either the maintenance of component or software is also all
Very simple realizes under the premise of system does not reset under guaranteeing the operating conditions such as surge, the fastest offer creepage protection function.
Detailed description of the invention
Fig. 1 is circuit block diagram of the invention；
Fig. 2 is circuit diagram of the invention.
Specific embodiment
Structure and principle of the invention are described in detail with reference to the accompanying drawing.
As shown in Figure 1, Remote Power Supply leakage protection circuit provided by the invention, including detection of electrical leakage unit, electric leakage are adjusted
Unit, electric leakage feedback unit, electric leakage control unit and residual current protective unit.
When there is electric leakage to occur, detection of electrical leakage unit can capture the electric leakage signal of Remote Power Supply output end, meanwhile, electric leakage
Protection location protects the circuit of Remote Power Supply for the electric leakage signal generated, limits further increasing for leakage current.Leakage
Electricity adjusts unit and receives the electric leakage signal that detection of electrical leakage unit detects, control is given to the size of the electric current of electric leakage feedback unit,
To adjust the sensitivity of electric leakage signal, and exports and give electric leakage feedback unit.Electric leakage signal is transferred to leakage by electric leakage feedback unit
Electric control unit, electric leakage control unit analysis electric leakage signal is surge phenomenon or leaky, is carried out based on the analysis results
Corresponding protection act, such as close, restart power supply etc..
As shown in Fig. 2, the specific electronic component that Remote Power Supply leakage protection circuit provided by the invention uses is few, tool
Body includes: the electric leakage feedback unit that two-way TVS pipe D101, thermistor PTC, resistance R101, two-way TVS pipe and triode form
U101, triode, resistance R102, digital signal processor DSP.
Wherein, two-way TVS pipe D101 and thermistor PTC series connection, one end connection Remote Power Supply of two-way TVS pipe D101
It simulates middle line (LINE), another termination thermistor PTC of two-way TVS pipe D101, then thermistor PTC is grounded (PGND).
It is then in parallel with two-way TVS pipe D101 after resistance R101 connects with electric leakage feedback unit U101.In electric leakage feedback unit U101
Two-way optocoupler one end connecting resistance, the two-way TVS pipe D101 of another termination, then base stage of the output optical signal to triode, triode
Collector connect digital signal processor DSP, while also connect with power switch DC_SOURCE by resistance R102.
When leak electricity occur when, the anode of Remote Power Supply output end/occur high pressure, thermistor conduct between cathode and PGND
Residual current protective unit can also increase, limit with the increase of the voltage of anode/between cathode and PGND, thermistor PTC resistor
Leakage current further increases.Meanwhile the and leakage that will test of the two-way TVS pipe D101 that is cascaded of thermistor PTC
Electric signal is given to electric leakage feedback unit U101 by resistance R101 and can control by adjusting the size of resistance R101 and be given to leakage
The size of the electric current of electric feedback unit, to realize the sensitivity of control earth leakage protective movement.Electric leakage feedback unit passes through electricity
Electric leakage signal is given to the digital signal processor DSP of electric leakage control unit by resistance R102, and digital signal processor DSP synthesis is various
Signal judges whether electric leakage signal is electric leakage or surge, and is performed corresponding processing according to the result after judgement, is closed
Power supply, the movement such as restart power supply.If digital signal processor DSP is judged as YES surge, distal end will not be restarted
Power supply, only the temporarily pulse of block 2ms, then proceedes to judge whether surge situation occurs, if continuous four times still have
Drain conditions, then it is not surge, to close entire power-supply system that judgement, which is practical electric leakage,.Pass through hardware detection and software
Algorithm, the quick protection while Surge handling capability realized under drain conditions are also improved.
Embodiments above is only to the structure illustrated the present invention, and those skilled in the art are in the present invention
Design under can make various deformation and variation, these deformation and variation be included within protection scope of the present invention.
Claims (5)
1. a kind of Remote Power Supply leakage protection circuit, which is characterized in that adjust unit, electric leakage including detection of electrical leakage unit, electric leakage
Feedback unit, electric leakage control unit and residual current protective unit；
The detection of electrical leakage unit is the first two-way TVS pipe, for obtaining the electric leakage signal of Remote Power Supply；
The electric leakage adjusts unit and receives the electric leakage signal that detection of electrical leakage unit detects, adjusts to the sensitivity of electric leakage signal
Section, and export and give electric leakage feedback unit；
The electric leakage feedback unit is made of two-way optocoupler and triode, for electric leakage signal to be transferred to electric leakage control unit；
The electric leakage control unit uses digital signal processor, is that surge phenomenon or electric leakage are existing for analyzing electric leakage signal
As carrying out corresponding protection act based on the analysis results；
The simulation middle line of one end connection Remote Power Supply of the first two-way TVS pipe, the other end connects two-way optocoupler, described two-way
The collector of the base stage of optocoupler connecting triode, the triode connects digital signal processor, when the first two-way TVS pipe detects
Electric leakage signal, by leaking electricity, feedback unit is transferred to the digital signal processor, and the digital signal processor default is sentenced
It is set to surge phenomenon, blocks the pulse of certain time length, continue to judge whether surge phenomenon occurs again, if surge phenomenon is continuously more
Secondary generation, then be determined as leaky, restarts far end supply.
2. Remote Power Supply leakage protection circuit as described in claim 1, which is characterized in that it is defeated that the electric leakage adjusts unit adjusting
The sensitivity of electric leakage signal is adjusted to realize to the electric current of electric leakage feedback unit out.
3. Remote Power Supply leakage protection circuit as described in claim 1, which is characterized in that the residual current protective unit is temperature-sensitive
The simulation middle line of resistance, the thermistor and Remote Power Supply is connect with protecting field.
4. Remote Power Supply leakage protection circuit as claimed in claim 3, which is characterized in that the first two-way TVS pipe connects double
It is connect simultaneously with the thermistor to one end of optocoupler.
5. Remote Power Supply leakage protection circuit as claimed in claim 4, which is characterized in that the electric leakage adjust unit be with it is double
To the resistance of TVS pipe parallel connection.
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 CN105811366A (en) | 2016-07-27 |
| CN105811366B true 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 (5)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8928188B2 (en) * | 2011-11-03 | 2015-01-06 | General Electric Company | Earth leakage power supply with bypass |
-
2016
- 2016-03-11 CN CN201610138534.XA patent/CN105811366B/en active Active
Patent Citations (5)
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
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| CN105811366A (en) | 2016-07-27 |
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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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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000, 5 floor, Fengyun mansion, five road north, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee after: Shenzhen Vmax Power 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. |
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Address after: 518000 Fengyun Science and Technology Building, No. 5 Industrial Zone, North Ring Road, Nanshan District, Shenzhen City, Guangdong Province, 501 Patentee after: Shenzhen Weimeisi New Energy (Group) Co.,Ltd. Country or region after: China 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. Country or region before: China |