CN106932644A - A kind of detection circuit of the lambda sensor internal resistance based on high frequency injection - Google Patents
A kind of detection circuit of the lambda sensor internal resistance based on high frequency injection Download PDFInfo
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- CN106932644A CN106932644A CN201710205515.9A CN201710205515A CN106932644A CN 106932644 A CN106932644 A CN 106932644A CN 201710205515 A CN201710205515 A CN 201710205515A CN 106932644 A CN106932644 A CN 106932644A
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- 238000002347 injection Methods 0.000 title claims abstract description 40
- 239000007924 injection Substances 0.000 title claims abstract description 40
- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000007493 shaping process Methods 0.000 claims abstract description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 12
- 239000003381 stabilizer Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- -1 oxonium ion Chemical class 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The present invention proposes a kind of detection circuit of the lambda sensor internal resistance based on high frequency injection, the power module powered including high-frequency signal shaping circuit, frequency volt change-over circuit and to the detection circuit, wherein, the high-frequency signal input high-frequency signal shaping circuit, the output end of the high-frequency signal shaping circuit is electrically connected with the input of frequency volt change-over circuit, and the output end of the frequency volt change-over circuit exports voltage signal magnitude corresponding with lambda sensor internal resistance Ri；The frequency volt change-over circuit is electrically connected with lambda sensor internal resistance Ri.A kind of detection circuit of lambda sensor internal resistance based on high frequency injection that the present invention is provided, by the internal resistance of detection lambda sensor in real time, can accurately judge the internal resistance of lambda sensor, optimize lambda sensor output voltage, then accurately calculate air-fuel ratio.
Description
Technical field
The present invention relates to technical field of automotive electronics, and in particular to a kind of inspection of the lambda sensor internal resistance based on high frequency injection
Slowdown monitoring circuit.
Background technology
Increasingly stricter with countries in the world motor vehicle exhaust emission regulation, automotive oxygen sensor is one in Hyundai Motor
Very important sensor, it is used to monitor the content of oxygen in motor exhaust, lambda sensor output under different oxygen contents
Different voltage signals, feeds back to engine controller ECU, ECU according to the voltage signal control distributive value, air inflow for receiving
Size, adjusts air-fuel ratio to reach optimal air-fuel ratio 14.7:1, so as to reach fuel-efficient, raising fuel efficiency, reduce the mesh such as pollution
's.
Automotive oxygen sensor is typically mounted in gas extraction system, is directly contacted with exhaust airstream.The general ternary in automobile
A preceding lambda sensor is installed before catalyst converter is used for the closed-loop control of engine, oxygen sensing after installing after ternary catalyzing unit
Device is used to detect whether preceding lambda sensor and ternary catalyzing unit work are normal.
The ceramic sensor material of automotive oxygen sensor is less than tens ohm at 700 DEG C or higher of temperature in internal resistance
Under state could effective conduction oxonium ion, but Tail Pipe Temperature of the engine under cold start-up and Part load well below
700℃.And Tail Pipe Temperature of the engine under cold start-up and Part load well below 700 DEG C when, the internal resistance of lambda sensor
Up to more than several kilohms, output signal can not reflect oxygen content, if made to ECU of the signal being exported under this operating mode
Air-fuel ratio is controlled, and tail gas pollution can be increased on the contrary.So needing to detect the internal resistance of lambda sensor.
Meanwhile, lambda sensor in use, due to reasons such as aging, poisoning, carbon distributions, can also cause the interior of oxygen sensing element
Resistance increases so that the failure such as occurs unstable idle speed, accelerates powerless, oil consumption increase, tail gas exceeded in operation in automobile.Therefore more need
The internal resistance of lambda sensor is detected to diagnose the failure of lambda sensor.Because the output signal width of lambda sensor can be changed
Value, so only measurement or the lower test of lambda sensor disconnection under lab of original measuring method, it is impossible to measurement in real time,
The content of the invention
In order to solve the above problems, the invention provides a kind of detection electricity of the lambda sensor internal resistance based on high frequency injection
Road.A kind of detection circuit of lambda sensor internal resistance based on high frequency injection that the present invention is provided, can be in vehicle operation
Real-time detection, the output of oxygen sensor signal and the work of engine are not influenceed.By the internal resistance of detection lambda sensor in real time,
The internal resistance of lambda sensor can accurately be judged, optimize lambda sensor output voltage, then accurately calculate air-fuel ratio.
The technical solution adopted by the present invention is as follows：
A kind of detection circuit of the lambda sensor internal resistance based on high frequency injection, including：
High-frequency signal shaping circuit：It is used to receive high-frequency signal and shaping is carried out to the high-frequency signal, then forms mark
Accurate High frequency injection signals；
Frequency volt change-over circuit：Be used to for the high-frequency signal of injection to be converted into voltage signal, the size of the voltage signal with
Lambda sensor internal resistance Ri changes and changes；
Lambda sensor internal resistance Ri and the power module powered to the detection circuit, wherein, the high-frequency signal input
High-frequency signal shaping circuit, the output end of the high-frequency signal shaping circuit and the input electrical connection of frequency volt change-over circuit,
The frequency volt change-over circuit is electrically connected with lambda sensor internal resistance Ri, output end output and the oxygen sensing of the frequency volt change-over circuit
The corresponding voltage signal magnitudes of device internal resistance Ri.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, also including backfeed loop, institute
Backfeed loop is stated to be used to the voltage signal power amplification, the output end of the frequency volt change-over circuit and the input of backfeed loop
End electrical connection.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, the high-frequency signal shaping
The common mode perturbations module that circuit includes first-order filtering circuit module, bleeder circuit module, suppresses high frequency, the high-frequency signal input
First-order filtering circuit module, the output end of the first-order filtering circuit module is connected with the input of bleeder circuit module, described
The output end of bleeder circuit module is connected with the input of the common mode perturbations module for suppressing high frequency, and the common mode for suppressing high frequency is disturbed
The output end of dynamic model block is connected with the input of frequency volt change-over circuit.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, the first-order filtering circuit
Module includes the 6th resistance R6, the 7th resistance R7, voltage-stabiliser tube Z and the 4th electric capacity C4, and one end of the 4th electric capacity C4 connects respectively
Meet the 6th resistance R6 and the 7th resistance R7, other end ground connection；One end of the voltage-stabiliser tube Z connects the 6th resistance R6 and the 7th respectively
Resistance R7, other end ground connection.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, it is described to suppress being total to for high frequency
Mould disturbance module includes the 3rd electric capacity C3, the first operational amplifier U1, and the 3rd electric capacity C3 jumps to the first operational amplifier
The input positive terminal and input negative terminal of U1.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, the bleeder circuit module
Including the 4th resistance R4 and the 5th resistance R5, the input negative terminal of the first operational amplifier U1 connect respectively the 4th resistance R4 with
The input negative terminal of the 5th resistance R5, the first operational amplifier U1 is just grounded by the 5th resistance R5.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, the frequency lies prostrate change-over circuit
Including first resistor R1, second resistance R2, the first electric capacity C1, the second electric capacity C2, one end of the first electric capacity C1 is connected to oxygen
The delivery outlet of sensor internal resistance Ri, the other end connects first resistor R1, second resistance R2 respectively；The first electric capacity C1 is by the
One resistance R1 is connected with the output end of the first operational amplifier U1；One end of the second electric capacity C2 is connected to second resistance R2,
The other end is grounded.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, the backfeed loop includes
3rd resistor R3, the 9th resistance R9 and the second operational amplifier U2, the input positive terminal of the second operational amplifier U2 connect successively
3rd resistor R3, the second electric capacity C2 are met, and is grounded by 3rd resistor R3, the second electric capacity C2, the second operational amplifier U2
Input negative terminal be connected with its output end, the input negative terminal of the second operational amplifier U2 is connected with the 9th resistance R9, described
The output end of the second operational amplifier U2 is connected with the 9th resistance R9.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, also including the 8th resistance R8,
One end of 8th resistance is connected with power module, and the other end of the 8th resistance R8 is respectively at the 7th resistance R7, high frequency
Signal input is connected；One end of the 4th resistance R4 is connected with power module, and the first operational amplifier of other end U1's is defeated
Enter negative terminal connection.
The present invention provides a kind of detection circuit of the lambda sensor internal resistance based on high frequency injection, is passed by detection oxygen in real time
The internal resistance of sensor, can accurately judge the internal resistance of lambda sensor, optimize lambda sensor output voltage, accurately calculate air-fuel ratio.
Meanwhile, the failure state of lambda sensor can be gone out with Accurate Diagnosis, it is to avoid because of the failure of lambda sensor, the exhaust emission for causing.It is high
The output signal of frequency Injection Signal and lambda sensor influences the signal output of lambda sensor due to being in different frequency domains, or not real
Show in vehicle operation, the internal resistance of real-time detection lambda sensor.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
Other accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 is a kind of theory diagram of the detection circuit of the lambda sensor internal resistance based on high frequency injection of the present invention；
Fig. 2 is a kind of circuit theory diagrams of the detection circuit of the lambda sensor internal resistance based on high frequency injection of the present invention.
Specific 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 is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment
As shown in Figure 1-2, a kind of detection circuit of the lambda sensor internal resistance based on high frequency injection, including high-frequency signal shaping
Circuit 10, frequency volt change-over circuit 20, backfeed loop 30, lambda sensor internal resistance Ri50 and the power supply powered to the detection circuit
Module VDD40, the high-frequency signal input high-frequency signal shaping circuit 10, the output end of the high-frequency signal shaping circuit 10 with
The input electrical connection of frequency volt change-over circuit 20, the frequency volt change-over circuit 20 is electrically connected with lambda sensor internal resistance Ri50,
The output end of the frequency volt change-over circuit 20 is electrically connected with the input of backfeed loop 30.
In foregoing circuit：
High-frequency signal shaping circuit 10：It is used to receive high-frequency signal and shaping is carried out to the high-frequency signal, is then formed
The High frequency injection signals of standard；
Frequency volt change-over circuit 20：It is used to for the high-frequency signal of injection to be converted into voltage signal, the size of the voltage signal
Change with lambda sensor internal resistance Ri and change；Frequency volt change-over circuit is that the high frequency test signals of injection are converted into measurable electricity
Pressure signal, the size of this voltage signal is determined by the internal resistance of lambda sensor.
Backfeed loop 30：The backfeed loop is used to the voltage signal power amplification.Due to frequency volt change-over circuit life
Into voltage signal magnitude it is too small, it is necessary to by feedback amplifier is by this signal shaping and amplifies decades of times, obtain a 0-5V
In the range of magnitude of voltage, be further easy to sampling.
Above-mentioned high-frequency signal shaping circuit 10 includes first-order filtering circuit module 11, bleeder circuit module 12, suppresses high frequency
Common mode perturbations module 13, high-frequency signal input first-order filtering circuit module 11, the first-order filtering circuit module 11
Output end is connected with the input of bleeder circuit module 12, the output end of the bleeder circuit module 12 and the common mode for suppressing high frequency
Disturb the input connection of module 13, output end and the frequency volt change-over circuit 20 of the common mode perturbations module 13 for suppressing high frequency
Input is connected.
Above-mentioned first-order filtering circuit module 11 includes the 6th resistance R6, the 7th resistance R7, voltage-stabiliser tube Z and the 4th electric capacity C4,
One end of the 4th electric capacity C4 connects the 6th resistance R6 and the 7th resistance R7, other end ground connection respectively；The one of the voltage-stabiliser tube Z
End connects the 6th resistance R6 and the 7th resistance R7, other end ground connection respectively.
Above-mentioned bleeder circuit module 12 includes the 4th resistance R4 and the 5th resistance R5, and the first operational amplifier U1's is defeated
Enter negative terminal and connect the 4th resistance R4 and the 5th resistance R5 respectively, the input negative terminal of the first operational amplifier U1 just passes through the 5th
Resistance R5 is grounded.
The common mode perturbations module 13 of above-mentioned suppression high frequency includes the 3rd electric capacity C3, the first operational amplifier U1, the described 3rd
Electric capacity C3 jumps to the input positive terminal and input negative terminal of the first operational amplifier U1.
Above-mentioned frequency volt change-over circuit 20 includes first resistor R1, second resistance R2, the first electric capacity C1, the second electric capacity C2, institute
The one end for stating the first electric capacity C1 is connected to the delivery outlet of lambda sensor internal resistance Ri, and the other end connects first resistor R1, second respectively
Resistance R2；The first electric capacity C1 is connected by first resistor R1 with the output end of the first operational amplifier U1；Second electricity
The one end for holding C2 is connected to second resistance R2, other end ground connection.
Above-mentioned backfeed loop 30 includes 3rd resistor R3, the 9th resistance R9 and the second operational amplifier U2, second fortune
The input positive terminal for calculating amplifier U2 is sequentially connected 3rd resistor R3, the second electric capacity C2, and by 3rd resistor R3, the second electric capacity C2
Ground connection, the input negative terminal of the second operational amplifier U2 is connected with its output end, the input of the second operational amplifier U2
Negative terminal is connected with the 9th resistance R9, and the output end of the second operational amplifier U2 is connected with the 9th resistance R9.
A kind of detection circuit of above-mentioned lambda sensor internal resistance based on high frequency injection, wherein, also including the 8th resistance R8,
One end of 8th resistance is connected with power module VDD, and the other end of the 8th resistance R8 is respectively at the 7th resistance R7, height
Frequency signal input is connected；One end of the 4th resistance R4 is connected with power module VDD, the first operational amplifier of other end U1
Input negative terminal connection.
A kind of detection circuit of lambda sensor internal resistance based on high frequency injection that the present invention is provided, is input into by Injection Signal mouthful
High-frequency signal, this high-frequency signal is by the first operational amplifier U1, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th
Resistance R7, the 3rd electric capacity C3, the shaping circuit of the composition of the 4th electric capacity C4 and voltage-stabiliser tube Z1 carry out the shaping of waveform, this signal warp
Cross and frequency volt conversion electricity is constituted by lambda sensor internal resistance Ri, first resistor R1, second resistance R2, the first electric capacity C1 and the second electric capacity C2
Road, produces a voltage signal, and the amplitude of the voltage signal is relevant with the value of lambda sensor internal resistance Ri, by the voltage of sampling
Amplitude, it can be deduced that the value of lambda sensor internal resistance Ri.
It is obvious to a person skilled in the art that the application is not limited to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit herein or essential characteristic, the application can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present application is by appended power
Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the application.Any reference in claim should not be considered as the claim involved by limitation.This
Outward, it is clear that " including " word is not excluded for other units or step, odd number is not excluded for plural number.The multiple stated in device claim
Unit or device can also be realized by a unit or device by software or hardware.The first, the second grade word is used for table
Show title, and be not offered as any specific order.
Certainly, it is obvious to a person skilled in the art that the application is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit herein or essential characteristic, can in other specific forms realize the application.Therefore,
No matter from the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present application is by institute
Attached claim is limited rather than described above, it is intended that will fall in the implication and scope of the equivalency of claim
All changes are included in the application.The right that any reference in claim should not be considered as involved by limitation will
Ask.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (9)
1. it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that including：
High-frequency signal shaping circuit：It is used to receive high-frequency signal and shaping is carried out to the high-frequency signal, then forms standard
High frequency injection signals；
Frequency volt change-over circuit：It is used to for the high-frequency signal of injection to be converted into voltage signal, the size of the voltage signal is passed with oxygen
Sensor internal resistance Ri changes and changes；
Lambda sensor internal resistance Ri and the power module powered to the detection circuit, wherein, the high-frequency signal is input into high frequency
Signal transformation circuit, the output end of the high-frequency signal shaping circuit and the input electrical connection of frequency volt change-over circuit, it is described
Frequency lies prostrate change-over circuit and is electrically connected with lambda sensor internal resistance Ri, in the output end output and lambda sensor of the frequency volt change-over circuit
The corresponding voltage signal magnitudes of resistance Ri.
2. it is according to claim 1 it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that
Also include backfeed loop, the backfeed loop is used to the voltage signal power amplification, and the frequency lies prostrate the output of change-over circuit
End is electrically connected with the input of backfeed loop.
3. the detection circuit of a kind of lambda sensor internal resistance based on high frequency injection according to claim 1 and 2, its feature exists
In the common mode perturbations mould that the high-frequency signal shaping circuit includes first-order filtering circuit module, bleeder circuit module, suppresses high frequency
Block, the high-frequency signal is input into first-order filtering circuit module, output end and the bleeder circuit mould of the first-order filtering circuit module
The input connection of block, the output end of the bleeder circuit module is connected with the input of the common mode perturbations module for suppressing high frequency,
The output end of the common mode perturbations module for suppressing high frequency is connected with the input of frequency volt change-over circuit.
4. it is according to claim 3 it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that
The first-order filtering circuit module includes the 6th resistance R6, the 7th resistance R7, voltage-stabiliser tube Z and the 4th electric capacity C4, the 4th electricity
The one end for holding C4 connects the 6th resistance R6 and the 7th resistance R7, other end ground connection respectively；One end of the voltage-stabiliser tube Z connects respectively
6th resistance R6 and the 7th resistance R7, other end ground connection.
5. it is according to claim 4 it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that
The common mode perturbations module for suppressing high frequency includes the 3rd electric capacity C3, the first operational amplifier U1, the 3rd electric capacity C3 bridgings
To the input positive terminal and input negative terminal of the first operational amplifier U1.
6. it is according to claim 5 it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that
The bleeder circuit module includes the 4th resistance R4 and the 5th resistance R5, and the input negative terminal of the first operational amplifier U1 is distinguished
The 4th resistance R4 and the 5th resistance R5 is connected, the input negative terminal of the first operational amplifier U1 is just connect by the 5th resistance R5
Ground.
7. it is according to claim 6 it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that
The frequency volt change-over circuit includes first resistor R1, second resistance R2, the first electric capacity C1, the second electric capacity C2, first electric capacity
One end of C1 is connected to the delivery outlet of lambda sensor internal resistance Ri, and the other end connects first resistor R1, second resistance R2 respectively；It is described
First electric capacity C1 is connected by first resistor R1 with the output end of the first operational amplifier U1；One end of the second electric capacity C2 connects
It is connected to second resistance R2, other end ground connection.
8. it is according to claim 7 it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that
The backfeed loop includes 3rd resistor R3, the 9th resistance R9 and the second operational amplifier U2, the second operational amplifier U2
Input positive terminal be sequentially connected 3rd resistor R3, the second electric capacity C2, and be grounded by 3rd resistor R3, the second electric capacity C2, it is described
The input negative terminal of the second operational amplifier U2 is connected with its output end, the input negative terminal and the 9th of the second operational amplifier U2
Resistance R9 is connected, and the output end of the second operational amplifier U2 is connected with the 9th resistance R9.
9. it is according to claim 8 it is a kind of based on high frequency injection lambda sensor internal resistance detection circuit, it is characterised in that
Also include the 8th resistance R8, one end of the 8th resistance is connected with power module, the other end difference of the 8th resistance R8
Connected in the 7th resistance R7, high-frequency signal input port；One end of the 4th resistance R4 is connected with power module, the other end first
The input negative terminal connection of operational amplifier U1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110441603A (en) * | 2019-08-13 | 2019-11-12 | 西安西驰电气股份有限公司 | A kind of earth leakage search/lockout sample circuit and detection method |
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