CN108233337A - A kind of output overcurrent detection guard method of overcurrent of distinguishing the true from the false - Google Patents
A kind of output overcurrent detection guard method of overcurrent of distinguishing the true from the false Download PDFInfo
- Publication number
- CN108233337A CN108233337A CN201611154116.6A CN201611154116A CN108233337A CN 108233337 A CN108233337 A CN 108233337A CN 201611154116 A CN201611154116 A CN 201611154116A CN 108233337 A CN108233337 A CN 108233337A
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- Prior art keywords
- overcurrent
- current
- circuit
- output
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
Abstract
A kind of output overcurrent detection guard method of overcurrent of distinguishing the true from the false realizes the overcurrent protection of output, specifically includes：Current detection circuit, overcurrent comparison circuit, overcurrent processing circuit.Current detection circuit is mainly the electric current of detection output in real time, and the circuit of output is analog signal, current comparison circuit be will detect current signal and preset over-current signal compare, if beyond preset overcurrent value, then it is assumed that output current；Overcurrent processing circuit is to handle the over-current signal that current comparison circuit exports, and overcurrent processing circuit has the function of 2, 1) it is to detect whether real overcurrent, 2) to exporting rapid protection, the Core Feature of the circuit, which is that, detects whether real overcurrent, due to moment of the output circuit in power-up and the moment with load, output can generate dash current, and dash current is considerably beyond preset overcurrent value, and reality output not overcurrent, belong to " false overcurrent ", and overcurrent processing circuit is exactly to be used for discerning whether real overcurrent, when detecting it is to belong to false overcurrent, it does not handle then；If true overcurrent, then output is closed immediately.
Description
Technical field
The invention belongs to computer application fields.
Background technology
The overcurrent protection of output is that the output of each power circuit has to the safeguard measure taken, and output current is protected at present
Protect varied, but what is largely relied on is current protection that power circuit master chip carries, the limitation of such overcurrent protection
It is relatively strong, and without versatility；And use high-power low value sampling resistor go detection electric current method, sampled signal and
Power signal is not isolated, and is directed to dash current and can not be judged true overcurrent or false overcurrent.
In view of the limitation and defective of existing sample rate current described above, the present inventor deeply grind for the prior art
Study carefully, and have this case generation.
Invention content
The present invention is directed to and traditional current sample, it is proposed that a kind of more accurate current to detect, and can quickly identify
True and false overcurrent rapidly makes overcurrent protection, it is ensured that rear end is not damaged.
It is an object of the invention to propose a kind of current detecting that can be applied in all power outputs and overcurrent protection
Method.This project key technology is accurate detection electric current, can distinguish the true from the false overcurrent, and feature can be examined accurately in current detection circuit
Electric current is surveyed, and the current signal detected is passed into next stage, current foldback circuit sentences the over-current signal received
Not, true overcurrent or false overcurrent are distinguished, so as to quickly and accurately be protected to the rear end of power output.
The detailed technical solution of the present invention is as follows：
The present invention includes：Current detection circuit, overcurrent comparison circuit, overcurrent processing circuit three parts.Current detection circuit
It is mainly made of Hall sensor, it is characterised in that be capable of the electric current of accurate sampled power circuit；Overcurrent comparison circuit is main
It is made of comparator and benchmark, it is characterised in that can accurately overcurrent value and a reference value be compared；Overcurrent processing circuit master
It to be made of CPLD logic chips, it is characterised in that being capable of the whether true overcurrent of accurate judgement or false overcurrent.Pass through following steps：
(1) current sampling circuit is by the electric current of Hall sensor sampled power circuit, and current value is converted to corresponding voltage
Value；(2) overcurrent comparison circuit comparator is compared according to current sampling data and preset overcurrent a reference value, works as sampled current value
More than default overcurrent value, over-current signal is transmitted to rear end by the overturning of comparator output level；(3) overcurrent processing circuit is according to biography
The over-current signal passed is judged that, when over-current signal is over-current state, CPLD carries out delay judgement, if in delay time
Over-current signal restores normal, then is judged as false overcurrent, is failure to actuate to power circuit；If over-current signal is always in delay time
In the presence of being then judged as true overcurrent at the end of delay time, make protection to power circuit immediately.
Description of the drawings：
Fig. 1 is current detection circuit figure；
Fig. 2 is overcurrent comparison circuit figure；
Fig. 3 is CPLD circuit figure；
The whole schematic diagram of Fig. 4 present invention
The specific logical process procedure chart of Fig. 5 overcurrent processing circuits
Specific embodiment：
Current detection circuit is used for detecting the electric current on power output line, and in order to accurate sample rate current, detection circuit is adopted
With Hall sensor, Hall sensor current sample range is big, realizes power signal and digital signal isolation, is serially connected in power
On line, peripheral circuit is simple, and specific circuit diagram is as shown in Figure 1：
1,2 pins are the input of power line in Fig. 1, and 3., 4 feet are the output of power line, can detect forward and reverse electricity
Stream, 7 feet are exported for current detection signal, and the signal and 8 foot VCC are a ground.
Overcurrent comparison circuit is that the current signal that receives current detection circuit and preset overcurrent value are compared, if
The voltage value of current signal is more than preset overcurrent value, then the output of comparator deflects, and comparator thinks output overcurrent.Tool
The circuit diagram of body is as shown in Figure 2：
N1 is comparator in Fig. 2, and the both ends of comparator are current detection signal and default overcurrent value, preset overcurrent value by base
Quasi- source is come by high-precision electric resistance partial pressure, can be modified for different overcurrent values.The output of comparator is
For over-current signal, over-current signal is the input of overcurrent processing circuit.
Overcurrent processing circuit includes 2 parts, overcurrent judgment part and overcurrent protection part, and overcurrent judgment part is to overcurrent
The overcurrent of comparison circuit output judge it being true overcurrent or false overcurrent, and overcurrent protection part is then when being judged as true overcurrent
Output is protected.
Traditional over-current detection can not judge true overcurrent or false overcurrent, when receiving over-current signal, uniformly regard
Stream process, the circuit are that over-current signal is input in logic chip CPLD, and CPLD receives the laggard line delay processing of over-current signal,
Be delayed 5ms, may be because of power-up or impact electricity caused by band carries suddenly if over-current signal level deflects in 5ms
Stream, is judged as false overcurrent；If in 5ms over-current signal always exist if may determine that be true overcurrent, protect circuit immediately
Cut-out output, protects rear end and headend equipment not to damage.
In CPLD 5ms delay using counter method, when the way of output is more, need to per all the way into
Row overcurrent protection, due to per all the way will delay judgement, so the resource occupation to CPLD is very big, so for overcurrent protection
Delay, CPLD will be used alone an independent crystal oscillator and count, and the frequency of crystal oscillator is low, effectively reduces to CPLD resources
Consumption.Specific circuit is as shown in Figure 3：
Over-current signal is input to CPLD in Fig. 3, and true and false overcurrent is differentiated in CPLD, such as if really overcurrent, then cuts off output, protects
End equipment is not damaged before and after shield；If false overcurrent, then do not handle.
Of the invention whole schematic diagram as shown in figure 4, the electric current output of the Hall sensor D1 acquisition power circuits of isolation,
To detect current signal is transmitted to overcurrent comparison circuit, comparator N1 compares no beyond preset mistake during current detection signal
Flow valuve, if it was exceeded, over-current signal is passed to CPLD, CPLD judges true and false overcurrent, false over-current signal according to over-current signal
It filters out, if it is true over-current signal to identify, front-end power circuit output is cut off immediately, equipment is protected not damage.
The advantages of technical solution of the present invention, is：The accurate sampling of output current, the accurate judgement of true and false overcurrent.For defeated
The electric current gone out can accurately sample, and overcurrent can accurately be judged, will not because of moment current spike and mistake cut-out it is defeated
Go out, it will not be because of the real overcurrent of output without safeguard measure.Greatly improve the safety of system, stability, reliability.
As shown in figure 5, product powers on, CPLD logics are initialized the specific logical process process of overcurrent processing circuit,
When CPLD has detected over-current signal, timer starts timing, and the time is up to 5ms, if over-current signal does not disappear in 5ms
It loses, then it is assumed that it is the true overcurrent of power circuit, the output of logic rupturing duty circuit immediately；If logic starts the 5ms in timing
Interior any time over-current signal disappears, then it is assumed that is false overcurrent, timer is reset again at the time of disappearance from over-current signal, protection
Mechanism is failure to actuate.True overcurrent or false overcurrent can be effectively distinguished in this way, it can be accurately to real output overcurrent
It is protected, has effectively filtered out false over-current signal, improve the accuracy rate and confidence level of failure.The 5ms of logical time delay
It is that the tolerance of overcurrent is integrated out according to the dash current duration and load of load power-up, to different circuits
It can be adjusted correspondingly, but delay time is the smaller the better according to practical loading condition, the damage of circuit, device is got over
It is small.
Claims (1)
1. a kind of output overcurrent detection guard method of overcurrent of distinguishing the true from the false, it is characterised in that：Including following steps：
Step 1 current sampling circuit is converted to current value relatively by the electric current of Hall sensor sampled power circuit
The voltage value answered；
Step 2 overcurrent comparison circuit comparator is compared according to current sampling data and preset overcurrent a reference value, works as sampling
Current value is more than default overcurrent value, and over-current signal is transmitted to rear end by the overturning of comparator output level；
Step 3 overcurrent processing circuit is judged according to the over-current signal of transmission, when over-current signal is over-current state, CPLD
Delay judgement is carried out, if over-current signal restores normal in delay time, is judged as false overcurrent, power circuit is not grasped
Make；It is judged as true overcurrent if over-current signal always exists in delay time, at the end of delay time, immediately to power electricity
Make protection in road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611154116.6A CN108233337A (en) | 2016-12-14 | 2016-12-14 | A kind of output overcurrent detection guard method of overcurrent of distinguishing the true from the false |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611154116.6A CN108233337A (en) | 2016-12-14 | 2016-12-14 | A kind of output overcurrent detection guard method of overcurrent of distinguishing the true from the false |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108233337A true CN108233337A (en) | 2018-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611154116.6A Pending CN108233337A (en) | 2016-12-14 | 2016-12-14 | A kind of output overcurrent detection guard method of overcurrent of distinguishing the true from the false |
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| CN (1) | CN108233337A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713638A (en) * | 2018-12-27 | 2019-05-03 | 惠科股份有限公司 | A kind of display panel and its over-current protection method and display device |
| CN113204466A (en) * | 2021-04-29 | 2021-08-03 | 山东英信计算机技术有限公司 | Over-temperature protection method and electronic equipment |
| CN114325382A (en) * | 2021-12-17 | 2022-04-12 | 珠海格力电器股份有限公司 | Three-phase alternating current motor open-phase fault detection method and system and electric equipment |
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| CN101330779A (en) * | 2008-07-24 | 2008-12-24 | 武汉理工大学 | Electric control device for modularization high-power electromagnetic range and control method |
| CN102522725A (en) * | 2011-12-21 | 2012-06-27 | 北京自动测试技术研究所 | Intelligent overcurrent protection circuit for integrated circuit test system |
| CN102593793A (en) * | 2012-04-10 | 2012-07-18 | 滕州亿达华闻煤电化有限公司 | Motor integrated protector |
| CN103499736A (en) * | 2013-10-22 | 2014-01-08 | 重庆长安汽车股份有限公司 | Over-current detection circuit and over-current protection circuit |
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2016
- 2016-12-14 CN CN201611154116.6A patent/CN108233337A/en active Pending
Patent Citations (4)
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| CN101330779A (en) * | 2008-07-24 | 2008-12-24 | 武汉理工大学 | Electric control device for modularization high-power electromagnetic range and control method |
| CN102522725A (en) * | 2011-12-21 | 2012-06-27 | 北京自动测试技术研究所 | Intelligent overcurrent protection circuit for integrated circuit test system |
| CN102593793A (en) * | 2012-04-10 | 2012-07-18 | 滕州亿达华闻煤电化有限公司 | Motor integrated protector |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713638A (en) * | 2018-12-27 | 2019-05-03 | 惠科股份有限公司 | A kind of display panel and its over-current protection method and display device |
| WO2020133631A1 (en) * | 2018-12-27 | 2020-07-02 | 惠科股份有限公司 | Display panel and overcurrent protection method therefor, and display device |
| CN109713638B (en) * | 2018-12-27 | 2021-04-02 | 惠科股份有限公司 | Display panel, overcurrent protection method thereof and display device |
| US11374394B2 (en) | 2018-12-27 | 2022-06-28 | HKC Corporation Limited | Display panel, overcurrent protection method thereof and display device |
| CN113204466A (en) * | 2021-04-29 | 2021-08-03 | 山东英信计算机技术有限公司 | Over-temperature protection method and electronic equipment |
| CN113204466B (en) * | 2021-04-29 | 2022-11-18 | 山东英信计算机技术有限公司 | Over-temperature protection method and electronic equipment |
| CN114325382A (en) * | 2021-12-17 | 2022-04-12 | 珠海格力电器股份有限公司 | Three-phase alternating current motor open-phase fault detection method and system and electric equipment |
| CN114325382B (en) * | 2021-12-17 | 2023-08-22 | 珠海格力电器股份有限公司 | Method and system for detecting open-phase fault of three-phase alternating current motor and electric equipment |
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Application publication date: 20180629 |