CN103267899B - A kind of automotive relay coil adhesive inductance test method - Google Patents
A kind of automotive relay coil adhesive inductance test method Download PDFInfo
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- CN103267899B CN103267899B CN201310080187.6A CN201310080187A CN103267899B CN 103267899 B CN103267899 B CN 103267899B CN 201310080187 A CN201310080187 A CN 201310080187A CN 103267899 B CN103267899 B CN 103267899B
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- adhesive
- coil
- current value
- automotive relay
- maximum stable
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Abstract
The invention discloses a kind of automotive relay coil adhesive inductance test method, comprise step: with 10 μ S sampling periods, sampling is continued to the current value of this coil, maximum stable current value D1max before the adhesive of acquisition coil, before calculating automotive relay coil adhesive, 63% of maximum stable current value D1max is worth, and makes T
before adhesive=arrive the time needed for 63% of maximum stable current value D1max before adhesive;calculate inductance L before described automotive relay coil adhesive
before adhesive=RT
before adhesive; Until described AUTOMOTIVE RELAY is in complete stability attracting state, maximum stable current value D2max after the adhesive of acquisition coil, after calculating automotive relay coil adhesive, 63% of maximum stable current value D2max is worth, and makes T
after adhesive=arrive maximum stable current value D2max after adhesive 63% needed for time;calculate inductance L after described automotive relay coil adhesive
after adhesive=RT
after adhesive.
Description
Technical field
The invention belongs to technical field of automotive electronics, particularly a kind of automotive relay coil adhesive inductance test method.
Background technology
The inductance that relay coil adhesive produces can impact whole Circuits System, can influential system stability.Excessive some electronic components of Circuits System that may cause of relay adhesive inductance are breakdown, have an accident.The method of usual test inductance sends high-frequency impulse at test inductance, and this method is more applicable to the inductance measurement in AC system, because AUTOMOTIVE RELAY is all direct current, so adopt this method to have a strong impact on test result.
Summary of the invention
The object of this invention is to provide a kind of automotive relay coil adhesive inductance test method.
Technical scheme of the present invention is, a kind of automotive relay coil adhesive inductance test method, comprises the following steps:
Automotive relay coil is accessed a 1mA constant current source, measure the magnitude of voltage obtaining this coil, calculate the resistance value R of this coil;
Its coil is made to carry out adhesive action to described AUTOMOTIVE RELAY on-load voltage, with 10 μ S sampling periods, sampling is continued to the current value of this coil, maximum stable current value D1max before the adhesive of acquisition coil, before calculating automotive relay coil adhesive, 63% of maximum stable current value D1max is worth, wherein, as D (N+1) – D(N) <D(N)-D (N-1) time, make D1max=D(N), D(N) be coil current sampled value, N is positive integer;
Make T
before adhesivethe time needed for 63% of maximum stable current value D1max before=arrival adhesive;
Calculate inductance L before described automotive relay coil adhesive
before adhesive=RT
before adhesive;
Continue to continue sampling with 10 μ S sampling periods to the current value of described automotive relay coil, until described AUTOMOTIVE RELAY is in complete stability attracting state, maximum stable current value D2max after the adhesive of acquisition coil, after calculating automotive relay coil adhesive, 63% of maximum stable current value D2max is worth, wherein, as D (N+1) – D(N)=D(N)-D (N-1)=0, and, N=1,2,3,4,5,6,7,8, when 9, make maximum stable current value point D2max after coil adhesive;
Make T
after adhesive=arrive time needed for 63% of maximum stable current value D2max after adhesive;
Calculate inductance L after described automotive relay coil adhesive
after adhesive=RT
after adhesive.
If determine that pickup time is T, be coil resistance according to formula L=RT, R, unit is Ω.T is the time, and unit is mS, L is coil adhesive inductance value, and unit is mJ.
The present invention comprises before relay adhesive and latter two state of stable adhesive for automotive relay coil adhesive inductance measurement, and the present invention tests these two inductance value.
Embodiment
The instrument of the inventive method is adopted to be meter specially automotive relay coil adhesive being produced to inductance measurement.Requirement relay coil is DC12V.The main hardware that this test macro is used:: the test board of C8051F005 single-chip microcomputer independent research, adopt 12 high-precision ADC sampling tests, sampling and process data is at every turn 10 μ S.One-touch startup, result liquid crystal display, hummer indicate.
It is carry out calculating by the resistance of busy relay coil and the time of generation current to obtain L=RT that the present invention tests inductance, and wherein L is inductance value, and R is coil resistance, and T is the time that coil current reaches 63% couple of maximum stable value.
Testing scheme performing step of the present invention is described below.
1. the test of coil resistance
Before coil adhesive, the constant current source of coil by a 1mA, AD samples, and obtains the resistance value of coil
2. before adhesive maximum stable electric current 63% value
Before adhesive, maximum stable current value appears at first current wave peak dot place, single-chip microcomputer is constantly sampled with the speed that 10 μ S are each to its electric current, after test, carry out screening to all data to judge, rear data of sampling deduct the previous data of sampling, when finding that difference has Long-term change trend from big to small, i.e. D (N+1) – D(N) <D(N)-D (N-1) time, before adhesive, maximum stable current value is just D(N), DN × 63% is exactly 63% value of maximum stable electric current before adhesive.
3. after adhesive maximum stable electric current 63% value
From test waveform, after adhesive, maximum stable current value appears at right side waveform stabilization smoothly to locate (close to straight line), single-chip microcomputer is constantly sampled with the speed that 10 μ S are each to its electric current, after test, carry out screening to all data to judge, deduct the previous data of sampling by rear data of sampling, when find difference have continuous 10 be 0 time, namely after have found adhesive, maximum current value point D2max, D2max × 63% is exactly 63% value of maximum stable electric current after adhesive.
4. the determination of time T
Because the time of each samples storage of single-chip microcomputer is 10 μ S, so find the position in the whole sampled data in corresponding point electric current place, be multiplied by 10 μ S, the time before just obtaining adhesive respectively and after adhesive.Such as judged by screening, DN data come the 54th in whole sampled data, so T=54 × 10 μ S=0.54mS.
5. the calculating of inductance
According to formula L=RT,
R is coil resistance, and unit is Ω; T is the time, and unit is mS.
L is coil adhesive inductance value, and unit is mJ.
Adopt meter specially using method of the present invention:
1. plug in socket, opens power supply.
2., by good for two clip wire clamps of measured relay coil instrument, press startup and test.
3. test can show two inductance value before adhesive and after adhesive after terminating.
Maximum stable electric current before and after adhesive and the inductance value before and after adhesive contact, and coil resistance is fixed value, constant.
Inductance L
before adhesive=RT
before adhesive
Inductance L
after adhesive=RT
after adhesive
Time T
before adhesive=arrive the time needed for maximum stable electric current 63% before adhesive
Time T
after adhesive=arrive the time needed for maximum stable electric current 63% after adhesive
Claims (1)
1. an automotive relay coil adhesive inductance test method, it is characterized in that, the on-load voltage of described automotive relay coil is DC12V, and test circuit comprises C8051F005 single-chip microcomputer and 12 high-precision ADC chips, sampling period is 10 μ S, comprises the following steps:
Automotive relay coil is accessed a 1mA constant current source, measure the magnitude of voltage obtaining this coil, calculate the resistance value R of this coil;
Its coil is made to carry out adhesive action to described AUTOMOTIVE RELAY on-load voltage, with 10 μ S sampling periods, sampling is continued to the current value of this coil, maximum stable current value D1max before the adhesive of acquisition coil, before calculating automotive relay coil adhesive, 63% of maximum stable current value D1max is worth, wherein, when D is (during N+1) – D (N) <D (N)-D (N-1), make D1max=D (N), D (N) is coil current sampled value, and N is positive integer;
Make T
before adhesivethe time needed for 63% of maximum stable current value D1max before=arrival adhesive;
Calculate inductance L before described automotive relay coil adhesive
before adhesive=RT
before adhesive;
Continue to continue sampling with 10 μ S sampling periods to the current value of described automotive relay coil, until described AUTOMOTIVE RELAY is in complete stability attracting state, maximum stable current value D2max after the adhesive of acquisition coil, after calculating automotive relay coil adhesive, 63% of maximum stable current value D2max is worth, wherein, when D (N+1) – D (N)=D (N)-D (N-1)=0, and, N=1,2,3,4,5,6,7,8, when 9, namely have found maximum stable current value point D2max after coil adhesive;
Make T
after adhesivethe time needed for 63% of maximum stable current value D2max after=arrival adhesive;
Calculate inductance L after described automotive relay coil adhesive
after adhesive=RT
after adhesive,
After the test process of test circuit is by one-touch startup, indicated by hummer, adopt liquid crystal display show simultaneously before adhesive with adhesive after two inductance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310080187.6A CN103267899B (en) | 2013-03-13 | 2013-03-13 | A kind of automotive relay coil adhesive inductance test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310080187.6A CN103267899B (en) | 2013-03-13 | 2013-03-13 | A kind of automotive relay coil adhesive inductance test method |
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| Publication Number | Publication Date |
|---|---|
| CN103267899A CN103267899A (en) | 2013-08-28 |
| CN103267899B true CN103267899B (en) | 2016-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310080187.6A Expired - Fee Related CN103267899B (en) | 2013-03-13 | 2013-03-13 | A kind of automotive relay coil adhesive inductance test method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108918971B (en) * | 2018-03-29 | 2022-04-19 | 浙江长兴笛卡尔科技有限公司 | Method and device for calculating dynamic equivalent internal resistance |
| CN110488182A (en) * | 2019-08-16 | 2019-11-22 | 哈尔滨工业大学（深圳） | A kind of method, system, device and the storage medium of relay on-line checking and monitoring |
| CN113138311B (en) * | 2021-04-01 | 2022-08-23 | 浙江方圆电气设备检测有限公司 | Method for measuring maximum inductance at power-off instant of high-voltage direct-current relay coil |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101408569A (en) * | 2008-11-28 | 2009-04-15 | 清华大学 | Oscillating circuit for detecting tiny plane coil inductance |
| CN102735944A (en) * | 2012-07-12 | 2012-10-17 | 杭州电子科技大学 | Direct-current motor armature inductance detection circuit |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101408569A (en) * | 2008-11-28 | 2009-04-15 | 清华大学 | Oscillating circuit for detecting tiny plane coil inductance |
| CN102735944A (en) * | 2012-07-12 | 2012-10-17 | 杭州电子科技大学 | Direct-current motor armature inductance detection circuit |
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| CN103267899A (en) | 2013-08-28 |
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Granted publication date: 20160330 Termination date: 20190313 |