CN107490744A - A kind of grounded continuous detection circuit of electric automobile power supply unit - Google Patents
A kind of grounded continuous detection circuit of electric automobile power supply unit Download PDFInfo
- Publication number
- CN107490744A CN107490744A CN201710673772.5A CN201710673772A CN107490744A CN 107490744 A CN107490744 A CN 107490744A CN 201710673772 A CN201710673772 A CN 201710673772A CN 107490744 A CN107490744 A CN 107490744A
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- resistance
- end connection
- electronic control
- control switch
- triode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of grounded continuous detection circuit of electric automobile power supply unit, including electronic control switch Q1, resistance R1 and triode Q2, the base stage connection signal input part GCM_TEST of the electronic control switch Q1, electronic control switch Q1 colelctor electrode connection resistance R1, resistance R1 other end connection resistance R2 and triode Q2 base stage, resistance R2 other end connecting triode Q2 emitter stage, the beneficial effects of the invention are as follows：First, the circuit structure used is simple, strong antijamming capability；2nd, the digital filtering algorithm of SCM system is coordinated, the accuracy and reliability for making earthing detection are improved；3rd, the circuit cost is very low, it is easy to is just integrated into related Control System.
Description
Technical field
The present invention relates to new-energy automobile field, the grounded continuous detection electricity of specifically a kind of electric automobile power supply unit
Road.
Background technology
Electric automobile power supply unit is as the device that electric energy is provided to charging electric vehicle, it is necessary to has complete circuit
Defencive function, wherein a critically important protection device is exactly ground connection continuous new detection and protection, when system detectio to device
Ground connection it is incomplete when send alarm, while can cut off or forbid the supply of electric power to load.It is so effective reliable
Grounded inspection circuit just become extremely important.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of grounded continuous detection circuit of electric automobile power supply unit,
To solve the problems, such as to mention in background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of grounded continuous detection circuit of electric automobile power supply unit, including electronic control switch Q1, resistance R1 and three poles
Pipe Q2, the electronic control switch Q1 base stage connection signal input part GCM_TEST, electronic control switch Q1 colelctor electrode connect
Connecting resistance R1, resistance R1 other end connection resistance R2 and triode Q2 base stage, resistance R2 other end connecting triode Q2
Emitter stage, triode Q2 colelctor electrode connection diode D1 anode and diode D2 anode, diode D1 negative electrode according to
Secondary to be connected in series resistance R3-R6, diode D2 negative electrode is sequentially connected in series resistance R7-R10, resistance R10 other end connection
It is sequentially connected in series resistance R14-R11, resistance R11 other end connection resistance R15 and the diode D3 of clamper protection, resistance
R15 other end concatenation operation amplifier U1B positive input, electric capacity C1 and resistance R16, operational amplifier U1B's is reverse
Input connects resistance R17 and resistance R18, and the resistance R18 other end connects resistance R19 and operational amplifier U1B output end,
Resistance R19 other end connection electric capacity C2 and operational amplifier U1A positive input, operational amplifier U1A reverse input
End connection resistance R20, resistance R21 and resistance R22, resistance R22 other end connection resistance R23.
Preferred scheme as the present invention：The other end connection electric capacity C4 of the resistance R23.
Compared with prior art, the beneficial effects of the invention are as follows：First, the circuit structure used is simple, strong antijamming capability；
2nd, the digital filtering algorithm of SCM system is coordinated, the accuracy and reliability for making earthing detection are improved；3rd, the circuit
Cost is very low, it is easy to is just integrated into related Control System.
Brief description of the drawings
Fig. 1 is the integrated circuit figure of the present invention.
Fig. 2 is the workflow diagram of the present 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 carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Refer to Fig. 1-2, a kind of grounded continuous detection circuit of electric automobile power supply unit, including electronic control switch
Q1, resistance R1 and triode Q2, the electronic control switch Q1 base stage connect signal input part GCM_TEST, and Electronic Control is opened
Q1 colelctor electrode connection resistance R1, resistance R1 other end connection resistance R2 and triode Q2 base stage are closed, resistance R2's is another
End connecting triode Q2 emitter stage, triode Q2 colelctor electrode connection diode D1 anode and diode D2 anode, two
Pole pipe D1 negative electrode is sequentially connected in series resistance R3-R6, and diode D2 negative electrode is sequentially connected in series resistance R7-R10, resistance
R10 other end connection is sequentially connected in series resistance R14-R11, resistance R11 other end connection resistance R15 and clamper protection
Diode D3, resistance R15 other end concatenation operation amplifier U1B positive input, electric capacity C1 and resistance R16, computing are put
Big device U1B reverse input end connection resistance R17 and resistance R18, resistance R18 other end connection resistance R19 and operation amplifier
Device U1B output end, resistance R19 other end connection electric capacity C2 and operational amplifier U1A positive input, operational amplifier
U1A reverse input end connection resistance R20, resistance R21 and resistance R22, resistance R22 other end connection resistance R23.
Resistance R23 other end connection electric capacity C4.
The present invention operation principle be：1.Q1 is the electronic control switch for testing electric current, when GCM_TSET receives high electricity
When flat, now Q1 is at conducting state, and Q2 base stage is just pulled to low level while Q1 is in the conduction state,
So now Q2 is also at conducting state, and this when of test voltage V+ (12V) will flow into R3, R4, R5 by D1,
R6, R7, R8, R9, R10, R14, R13, R12, R11 are flowed into by D2, are directly entered after current flowing resistance network is tested
The in-phase input end of U1B amplifiers needs especially to D1 and D2 illustratively herein, D1 and D2 can only one-way flow test voltage,
And high-voltage ac power is reversely separated
2.D3 is the diode for clamper protection, when AC power supply system imperfect earth or zero line pair when be not grounded
Ground has the voltage of tens volts or upper hectovolt, so needing this diode to be protected as the input clamper of operational amplifier
Shield
3.V+ is 12V amplifier cathode power supply, and V- is -12V amplifier negative power supply
4.C3 is the decoupling electric capacity of amplifier power supply, primarily to suppressing high-frequency noise
5.C1 and C2 is filter capacitor.
6.R15, R16,17, R18 and U1B together form same phase amplifier, and for input voltage, we can write out expression
Formula:
Vout (U1B)=Vin (zero line+test voltage V+) * [R16/ (R15+R16)] * [(R17+R18)/R17]
7.R19, R22, R20, R21 and U1A together form difference amplifier.
8. being converted by the signal of two-stage calculation amplifying circuit, we can obtain the interval value of a voltage, pass through list
Piece machine digital-to-analogue conversion mouth can sample this voltage, so as to set suitable threshold value to judge whether ground connection is correct
9. if we allow test switch in 0.5hz pulse mode, our cans respectively pulse be high level and
Digital-to-analogue conversion sampling is carried out during low level respectively, then we subtract each other value measured by each pulse low and high level, such as
Fruit finds that voltage difference twice is more than 0.5V, then it is considered that system earth now is problematic, but done due to various
The presence of contact wild effect is disturbed and is grounded, so we generally also need to make digital filtering finally to determine ground connection
Continuity, if such as one can consider that all measuring voltage difference for continuous 5 times is more than 0.5V, we are considered as the system
Imperfect earth, but if test is more than for continuous 3 times after 0.5V when occurring difference again and be less than 0.5V, we are just needed connecting just now
Continuous 3 times measured subtract 1, successively if failure does not occur again, we just subtract zero untill, indivedual detection cases may root
Change the setting of wave filter according to actual conditions.
Claims (2)
1. a kind of grounded continuous detection circuit of electric automobile power supply unit, including electronic control switch Q1, resistance R1 and three
Pole pipe Q2, it is characterised in that the base stage connection signal input part GCM_TEST of the electronic control switch Q1, electronic control switch
Q1 colelctor electrode connection resistance R1, resistance R1 other end connection resistance R2 and triode Q2 base stage, the resistance R2 other end
Connecting triode Q2 emitter stage, triode Q2 colelctor electrode connection diode D1 anode and diode D2 anode, two poles
Pipe D1 negative electrode is sequentially connected in series resistance R3-R6, and diode D2 negative electrode is sequentially connected in series resistance R7-R10, resistance R10
Other end connection be sequentially connected in series resistance R14-R11, resistance R11 other end connection resistance R15 and the two of clamper protection
Pole pipe D3, resistance the R15 other end concatenation operation amplifier U1B positive input, electric capacity C1 and resistance R16, operation amplifier
Device U1B reverse input end connection resistance R17 and resistance R18, resistance R18 other end connection resistance R19 and operational amplifier
U1B output end, resistance R19 other end connection electric capacity C2 and operational amplifier U1A positive input, operational amplifier
U1A reverse input end connection resistance R20, resistance R21 and resistance R22, resistance R22 other end connection resistance R23.
A kind of 2. grounded continuous detection circuit of electric automobile power supply unit according to claim 1, it is characterised in that
The other end connection electric capacity C4 of the resistance R23.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710673772.5A CN107490744A (en) | 2017-08-09 | 2017-08-09 | A kind of grounded continuous detection circuit of electric automobile power supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710673772.5A CN107490744A (en) | 2017-08-09 | 2017-08-09 | A kind of grounded continuous detection circuit of electric automobile power supply unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107490744A true CN107490744A (en) | 2017-12-19 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710673772.5A Pending CN107490744A (en) | 2017-08-09 | 2017-08-09 | A kind of grounded continuous detection circuit of electric automobile power supply unit |
Country Status (1)
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| CN (1) | CN107490744A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738746A (en) * | 2019-01-25 | 2019-05-10 | 中国汽车技术研究中心有限公司 | A kind of car electrics earthing failure test macro based on electronic control switch |
| CN110988448A (en) * | 2019-12-12 | 2020-04-10 | 厦门市爱维达电子有限公司 | Filtering method applied to UPS bus voltage sampling |
| CN112467841A (en) * | 2020-11-25 | 2021-03-09 | 厦门著赫电子科技有限公司 | Rifle system control circuit charges |
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| CN2232589Y (en) * | 1995-08-10 | 1996-08-07 | 苏州市四通电器厂 | Test instrument for protecting earth circuit continuous |
| US5561380A (en) * | 1995-05-08 | 1996-10-01 | Chrysler Corporation | Fault detection system for electric automobile traction system having floating ground |
| JP2000197201A (en) * | 1998-12-28 | 2000-07-14 | Denso Corp | Ground fault detecting circuit for electric vehicle |
| EP1396918A2 (en) * | 2002-09-06 | 2004-03-10 | Bae Systems Controls, Inc. | Ground fault detection system |
| CN101413984A (en) * | 2007-10-04 | 2009-04-22 | 李尔公司 | Vehicle AC ground fault detection system |
| CN102288834A (en) * | 2010-06-03 | 2011-12-21 | 李尔公司 | Ground monitor |
| CN102608515A (en) * | 2010-12-27 | 2012-07-25 | 李尔公司 | System and method for evaluating vehicle charging circuits |
| CN102645575A (en) * | 2011-02-18 | 2012-08-22 | 李尔公司 | Method and apparatus for detecting existence of safety ground |
| CN103313870A (en) * | 2010-08-18 | 2013-09-18 | 航空环境公司 | Ground fault interrupt automatic test method for electric vehicle |
| JP2016101040A (en) * | 2014-11-25 | 2016-05-30 | 株式会社デンソー | Ground fault detection circuit for vehicle having high voltage power source system |
-
2017
- 2017-08-09 CN CN201710673772.5A patent/CN107490744A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5561380A (en) * | 1995-05-08 | 1996-10-01 | Chrysler Corporation | Fault detection system for electric automobile traction system having floating ground |
| CN2232589Y (en) * | 1995-08-10 | 1996-08-07 | 苏州市四通电器厂 | Test instrument for protecting earth circuit continuous |
| JP2000197201A (en) * | 1998-12-28 | 2000-07-14 | Denso Corp | Ground fault detecting circuit for electric vehicle |
| EP1396918A2 (en) * | 2002-09-06 | 2004-03-10 | Bae Systems Controls, Inc. | Ground fault detection system |
| CN101413984A (en) * | 2007-10-04 | 2009-04-22 | 李尔公司 | Vehicle AC ground fault detection system |
| CN102288834A (en) * | 2010-06-03 | 2011-12-21 | 李尔公司 | Ground monitor |
| CN103313870A (en) * | 2010-08-18 | 2013-09-18 | 航空环境公司 | Ground fault interrupt automatic test method for electric vehicle |
| CN102608515A (en) * | 2010-12-27 | 2012-07-25 | 李尔公司 | System and method for evaluating vehicle charging circuits |
| CN102645575A (en) * | 2011-02-18 | 2012-08-22 | 李尔公司 | Method and apparatus for detecting existence of safety ground |
| JP2016101040A (en) * | 2014-11-25 | 2016-05-30 | 株式会社デンソー | Ground fault detection circuit for vehicle having high voltage power source system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109738746A (en) * | 2019-01-25 | 2019-05-10 | 中国汽车技术研究中心有限公司 | A kind of car electrics earthing failure test macro based on electronic control switch |
| CN110988448A (en) * | 2019-12-12 | 2020-04-10 | 厦门市爱维达电子有限公司 | Filtering method applied to UPS bus voltage sampling |
| CN112467841A (en) * | 2020-11-25 | 2021-03-09 | 厦门著赫电子科技有限公司 | Rifle system control circuit charges |
| CN112467841B (en) * | 2020-11-25 | 2022-12-27 | 厦门著赫电子科技有限公司 | Rifle system control circuit charges |
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Application publication date: 20171219 |