CN208367535U - A kind of current detection circuit of automotive electronics ECU - Google Patents
A kind of current detection circuit of automotive electronics ECU Download PDFInfo
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- CN208367535U CN208367535U CN201821161221.7U CN201821161221U CN208367535U CN 208367535 U CN208367535 U CN 208367535U CN 201821161221 U CN201821161221 U CN 201821161221U CN 208367535 U CN208367535 U CN 208367535U
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Abstract
The utility model discloses the current detection circuit of automotive electronics ECU a kind of, and field-effect tube BG1 grid is input, and field-effect tube BG1 grounded drain, field-effect tube BG1 source electrode is separately connected one end of diode D2 anode Yu resistance R3-R4；Diode D2 cathode connects power supply, another terminating diode D1 cathode of resistance R3, another termination triode BG2 base stage of resistance R4；Diode D1 anode connects power supply through inductance L all the way, and another way connects triode BG2 source electrode through resistance R5；Triode BG2 drain electrode is grounded through resistance R6 all the way, and another way connects the input anode of amplifier IC2B through resistance R7；Amplifier IC2B input negative terminal is grounded through resistance R8；Amplifier IC2B output end is output；The both ends of resistance R9 connect amplifier IC2B input negative terminal and output end respectively；Resistance R10 mono- terminates the output end of amplifier IC2B, other end ground connection.The utility model has preferable current detection accuracy, and wider linear detection range can meet automotive electronics ECU detection accuracy and range.
Description
Technical field
The utility model relates to electronic control system technical fields, and in particular to a kind of current detecting of automotive electronics ECU
Circuit.
Background technique
Since automotive electronics ECU (electronic control system) determines the performance quality of automobile entirety to a certain extent, because
This needs to carry out comprehensive test of reliability and stability to completion ECU function newly developed.And any one ECU is by various
Electronic circuit cell and corresponding software composition, therefore when testing, electric current inspection is carried out to the circuit unit of ECU
It surveys.
Utility model content
The utility model provides the current detection circuit of automotive electronics ECU a kind of, can be realized to automotive electronics ECU's
Electric current realizes that high-precision detects.
To solve the above problems, the utility model is achieved through the following technical solutions:
A kind of current detection circuit of automotive electronics ECU, including detection circuit ontology, the detection circuit ontology is by amplifying
Device IC2B, field-effect tube BG1, triode BG2, diode D1-D2, inductance L and resistance R3-R10 composition；Field-effect tube BG1
Grid form the input terminal of detection circuit ontology, the source electrode of the grounded drain GNDA of field-effect tube BG1, field-effect tube BG1 point
It Lian Jie not the anode of diode D2 and wherein one end of resistance R3 and R4；The cathode of diode D2 meets power supply V1, resistance R3's
The cathode of another terminating diode D1, the base stage of another termination triode BG2 of resistance R4；The anode of diode D1 is divided into two
Road, meets power supply V1 through inductance L all the way, and another way connects the source electrode of triode BG2 through resistance R5；The drain electrode of triode BG2 is divided into two
Road, is grounded GNDA through resistance R6 all the way, and another way connects the input anode of amplifier IC2B through resistance R7；The input of amplifier IC2B
Negative terminal is grounded GNDA through resistance R8；The output end of amplifier IC2B forms the output end of detection circuit ontology；The both ends of resistance R9
It is connect respectively with the input negative terminal of amplifier IC2B with output end；The output end of a termination amplifier IC2B of resistance R10, it is another
End ground connection GNDA.
In above scheme, resistance R8 is connected in series by a fixed resistance and a variable resistance.
Compared with prior art, the utility model be applied to automotive electronics ECU electronic circuit functional test in, have compared with
Good current detection accuracy, wider linear detection range can meet automotive electronics ECU detection accuracy and range.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the current detection circuit of automotive electronics ECU.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific example, and join
According to attached drawing, the utility model is further described.
Referring to Fig. 1, a kind of current detection circuit of automotive electronics ECU, by amplifier IC2B, field-effect tube BG1, triode
BG2, diode D1-D2, inductance L and resistance R3-R10 composition.The grid of field-effect tube BG1 forms the defeated of this detection circuit
Enter end, the grounded drain GNDA of field-effect tube BG1, the source electrode of field-effect tube BG1 is separately connected the anode and electricity of diode D2
Hinder wherein one end of R3 and R4.The cathode of diode D2 meets power supply V1, the cathode of another terminating diode D1 of resistance R3, R4's
The base stage of another termination triode BG2.The anode of diode D1 is divided into two-way, meets power supply V1 through inductance L all the way, another way is through electricity
Resistance R5 connects the source electrode of triode BG2.The drain electrode of triode BG2 is divided into two-way, is grounded GNDA through resistance R6 all the way, another way is through electricity
Resistance R7 connects the input anode of amplifier IC2B.The input negative terminal of amplifier IC2B is grounded GNDA through resistance R8.In the utility model
In preferred embodiment, resistance R8 is connected in series by a fixed resistance and a variable resistance.The output end shape of amplifier IC2B
The output end of cost detection circuit.The both ends of resistance R9 are connect with the input negative terminal of amplifier IC2B with output end respectively.Resistance
The output end of a termination amplifier IC2B of R10, the other end are grounded GNDA.
The working principle of above-mentioned current detection circuit is as follows: D1, R3 are by electric current ILThe voltage V being transformed between AC two o'clockAC
=VD1+IL·R3.Since the given value of current signal of it and control circuit is not in the same reference point, as current feedback
Signal also needs to convert it.Translation circuit is constituted using BG3, R4, R5, R6.IbFor the base current of BG2, VbeFor BG2
BE tie conduction voltage drop, then have
Ib·R4+Vbe+(1+β)Ib=VAC=VD1+IL·R3
Due to Vbe≈VD1, so that
Due to β > > 1, and R 4 is close with R5 resistance value, therefore R4+(1+β)R5≈β·R5, at this timeIt should
Voltage is ILLinear function, it is unrelated with the amplification factor β of selected triode, and using publicly O as potential reference point.In this way
Just by ILIt has been transformed into and Setting signal IGThe voltage signal of same reference points.The purpose for increasing R5 is to improve the stabilization of BG2 work
Property.For circuit shown in Fig. 1, VB=0.2IL.In order to consistent with the scale of given value of current signal, it is made of IC2B and R7, R8, R9
One amplifying circuit, makes
In Fig. 1, R9=20k Ω, R8 are that 2k Ω fixed resistance is connected with 10k Ω variable resistance, for adjustment circuit
Amplification factor.Adjusting range 0.53~2.2.
It should be noted that although the above embodiment described in the utility model be it is illustrative, this is not to this
The limitation of utility model, therefore the utility model is not limited in above-mentioned specific embodiment.The utility model is not being departed from
In the case where principle, the other embodiment that all those skilled in the art obtain under the enlightenment of the utility model is accordingly to be regarded as
Within the protection of the utility model.
Claims (2)
1. a kind of current detection circuit of automotive electronics ECU, including detection circuit ontology, characterized in that the detection circuit sheet
Body is made of amplifier IC2B, field-effect tube BG1, triode BG2, diode D1-D2, inductance L and resistance R3-R10；
The grid of field-effect tube BG1 forms the input terminal of detection circuit ontology, the grounded drain GNDA of field-effect tube BG1, field effect
Should the source electrode of pipe BG1 be separately connected the anode of diode D2 and wherein one end of resistance R3 and R4；The cathode of diode D2 connects
The cathode of another terminating diode D1 of power supply V1, resistance R3, the base stage of another termination triode BG2 of resistance R4；Diode
The anode of D1 is divided into two-way, meets power supply V1 through inductance L all the way, and another way connects the source electrode of triode BG2 through resistance R5；Triode
The drain electrode of BG2 is divided into two-way, is grounded GNDA through resistance R6 all the way, and another way connects the input anode of amplifier IC2B through resistance R7；
The input negative terminal of amplifier IC2B is grounded GNDA through resistance R8；The output end of amplifier IC2B forms the output of detection circuit ontology
End；The both ends of resistance R9 are connect with the input negative terminal of amplifier IC2B with output end respectively；A termination amplifier of resistance R10
The output end of IC2B, the other end are grounded GNDA.
2. the current detection circuit of automotive electronics ECU according to claim 1 a kind of, characterized in that resistance R8 is by one
Fixed resistance and a variable resistance are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821161221.7U CN208367535U (en) | 2018-07-16 | 2018-07-16 | A kind of current detection circuit of automotive electronics ECU |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821161221.7U CN208367535U (en) | 2018-07-16 | 2018-07-16 | A kind of current detection circuit of automotive electronics ECU |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208367535U true CN208367535U (en) | 2019-01-11 |
Family
ID=64925733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821161221.7U Expired - Fee Related CN208367535U (en) | 2018-07-16 | 2018-07-16 | A kind of current detection circuit of automotive electronics ECU |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208367535U (en) |
-
2018
- 2018-07-16 CN CN201821161221.7U patent/CN208367535U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190111 Termination date: 20190716 |
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| CF01 | Termination of patent right due to non-payment of annual fee |