CN109188266A - A kind of detection circuit and its detection method that high voltage negative relay is adhered - Google Patents

A kind of detection circuit and its detection method that high voltage negative relay is adhered Download PDF

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Publication number
CN109188266A
CN109188266A CN201811184419.1A CN201811184419A CN109188266A CN 109188266 A CN109188266 A CN 109188266A CN 201811184419 A CN201811184419 A CN 201811184419A CN 109188266 A CN109188266 A CN 109188266A
Authority
CN
China
Prior art keywords
unit
relay
adhered
cathode
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811184419.1A
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Chinese (zh)
Inventor
钟少斌
刘晨南
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Tafel New Energy Technology Co Ltd
Jiangsu Tafel New Energy Technology Co Ltd
Shenzhen Tafel New Energy Technology Co Ltd
Original Assignee
Dongguan Tafel New Energy Technology Co Ltd
Jiangsu Tafel New Energy Technology Co Ltd
Shenzhen Tafel New Energy Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongguan Tafel New Energy Technology Co Ltd, Jiangsu Tafel New Energy Technology Co Ltd, Shenzhen Tafel New Energy Technology Co Ltd filed Critical Dongguan Tafel New Energy Technology Co Ltd
Priority to CN201811184419.1A priority Critical patent/CN109188266A/en
Publication of CN109188266A publication Critical patent/CN109188266A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3275Fault detection or status indication
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/16Information or communication technologies improving the operation of electric vehicles

Abstract

The present invention discloses a kind of detection circuit that high voltage negative relay is adhered, including battery pack, it is always positive to be connected to battery pack, the positive relay and cathode relay of total cathode, it further include the bleeder circuit for connecting total anode and cathode relay output end, the A/D converting unit being electrically connected with bleeder circuit, communication unit is isolated with what A/D converting unit was electrically connected, and be isolated communication unit electrical connection micro-control unit, bleeder circuit includes concatenated first resistor unit and second resistance unit, one end of first resistor unit is connected to total anode, voltage acquisition point is provided between first resistor unit and second resistance unit, voltage acquisition point is electrically connected with the input terminal of A/D converting unit, between second resistance unit and the output end of cathode relay with being provided with sample reference.The present invention can have found whether cathode relay is adhered, and improve the reliability of circuit.In addition, the invention also discloses a kind of detection methods that high voltage negative relay is adhered.

Description

A kind of detection circuit and its detection method that high voltage negative relay is adhered
Technical field
The invention belongs to the technical fields of relay test, and in particular to a kind of detection that high voltage negative relay is adhered electricity Road and its detection method.
Background technique
Nowadays, in the high-pressure system of electric car, the state-detection of relay be realize electric car power on safely, under The important technology of electricity.Electric automobile high-voltage components are more, in actual moving process, when short-circuit failure occurs in components load When or full-vehicle control timing Design it is unreasonable, high current can be generated on power line leads to relay adhesion, in order to rise safely See, electric car power on and lower electric process in, it is necessary to relay status is detected.
Wherein, Chinese patent literature discloses a kind of power battery major loop relay fault detecting circuit of electric car And its detection method (publication number: 106124980 A of CN), comprising: vehicle interface circuit, normally closed low-voltage relay, current limliting electricity Resistance, high pressure optocoupler, divider resistance, isolated amplifier and power module, normally closed low-voltage relay contact one end and low tension battery Anode connection, one end are connect by current-limiting resistance with high pressure optocoupler control terminal, and low-voltage relay coil one end connects with ACC grades of power supplys It connects, one end is connect with low tension battery cathode, and isolated amplifier, power module are powered by low tension battery, divider resistance electricity Road both ends are connect respectively in the positive contacts of contactor downstream of master and main negative contacts of contactor upstream.Above-mentioned scheme to a certain extent can Relay adhesion is enough detected, but at least there is also following defects for this scheme: first, logical operation amount is big, influences abnormal anti- The real-time of feedback;Second, photoelectric device is easy failure, and system reliability is caused to be deteriorated;Third, testing cost are high.
Summary of the invention
It is an object of the present invention to: in view of the deficiencies of the prior art, provide what a kind of high voltage negative relay was adhered Detection circuit can find whether cathode relay is adhered before battery leads to high-voltage electricity, help to ensure battery system It works normally, improves the stability and reliability of the circuit system of battery, meanwhile, detect that cathode relay is adhered in advance, energy The safety for enough improving maintenance personal, helps to prevent personnel from accidentally touching equipment and causing casualty accident.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of detection circuit that high voltage negative relay is adhered, including battery pack, be connected to the total anode of the battery pack, be total The positive relay and cathode relay of cathode further include the partial pressure of connection total anode and the cathode relay output end Circuit, with the bleeder circuit electrical connection A/D converting unit, with the A/D converting unit be electrically connected be isolated communication unit, And with the micro-control unit that communication unit electrical connection is isolated, the bleeder circuit includes concatenated first resistor unit and the Two resistance units, one end of the first resistor unit are connected to total anode, the first resistor unit and described second Voltage acquisition point is provided between resistance unit, the voltage acquisition point is electrically connected with the input terminal of the A/D converting unit, institute It states between second resistance unit and the output end of the cathode relay with being provided with sample reference.
As a kind of a kind of improvement for the detection circuit that high voltage negative relay is adhered of the present invention, first electricity Hindering unit includes first resistor and second resistance, and the second resistance unit includes 3rd resistor, one end of the first resistor It is connected to total anode, the voltage acquisition point, the third are provided between the second resistance and the 3rd resistor Between resistance and the output end of the cathode relay with being provided with the sample reference.
As a kind of a kind of improvement for the detection circuit that high voltage negative relay is adhered of the present invention, the A/D turns The ground terminal for changing unit and the isolation communication unit is electrically connected with the sample reference.A/D converting unit and isolation are logical Believe unit with same sample reference, can reduce the noise jamming in signal transmission.
As a kind of a kind of improvement for the detection circuit that high voltage negative relay is adhered of the present invention, the detection electricity Road further includes isolated power supply, and the A/D converting unit, the isolation communication unit and the micro-control unit are isolated with described Power electric connection.The power input of A/D converting unit, isolation communication unit and micro-control unit is connected to isolated power supply, It can reduce the influence of noise in signal transmission in this way, improve the stability of digital signal.
As a kind of a kind of improvement for the detection circuit that high voltage negative relay is adhered of the present invention, the A/D turns It changes unit, the isolation communication unit, the micro-control unit and passes through clock communication line and data telecommunication line progress data biography It is defeated.Data telecommunication line SDA is bidirectional data line, and clock communication line SCL is clock line, and data are transmitted in I2C bus, are sent first Highest order, such as: by host issue enabling signal after, SDA between SCL high period by high level jump be low level, then by Host sends the data of a byte;Data Transfer Done issues stop signal by host, and SDA is between SCL high period by low Level jump is high level, i.e. the transmission of realization orderly information.
As a kind of a kind of improvement for the detection circuit that high voltage negative relay is adhered of the present invention, it is described anode after Electric appliance and the cathode relay are single-contact relay.Single-contact relay is relatively simple for structure, facilitates maintenance personal Circuit is repaired.
As a kind of a kind of improvement for the detection circuit that high voltage negative relay is adhered of the present invention, the detection electricity Road further includes warning device, and the warning device is electrically connected with the micro-control unit.Warning device for prompt operator or Maintenance personal helps to find that cathode relay is adhered in advance, improves the safety of battery.
As a kind of a kind of improvement for the detection circuit that high voltage negative relay is adhered of the present invention, the microcontroller Unit is electrically connected with the cathode relay.Micro-control unit can control cathode relay closing or opening.
The second object of the present invention is to additionally provide a kind of detection method that high voltage negative relay is adhered, including as follows Step:
1) A/D converting unit acquisition electric car is in the voltage Uab in power process between voltage acquisition point and sample reference ground, Then digital signal is converted analog signals into, and is sent to isolation communication unit;
2) received signal is carried out isolation processing by isolation communication unit, and is sent to micro-control unit;
3) micro-control unit is according to the voltage Uab in power process between voltage acquisition point and sample reference ground, judge cathode after Whether electric appliance is adhered.
In detection method of the invention, the voltage Uab between step 1) voltage acquisition point and sample reference ground is actually The voltage at second resistance unit both ends is sampled, A/D converting unit is in real time monitored voltage Uab, and is converted For digital signal;The communication isolating that communication unit is suitable between complicated circuit is isolated in step 2), can not only improve communication efficiency, The applicable performance of circuit can also be enhanced;Step 3) can in sample reference generate zero potential reference after disconnecting due to cathode relay Point, and one end of second resistance unit with sample reference is connected, therefore voltage of the sample reference ground between voltage acquisition point It can be used for judging whether cathode relay is adhered.
As a kind of a kind of improvement for the detection method that high voltage negative relay is adhered of the present invention, sentence in step 3) The method that disconnected cathode relay is adhered, includes the following steps:
If entire car controller has sent battery pack power-on command, and Uab > 0, then the cathode relay normally closed is judged;
If entire car controller has sent battery pack power off command, and Uab=0, then judge that the cathode relay normally disconnects;
If entire car controller has sent battery pack power off command, and Uab > 0, then judge that the cathode relay is adhered.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is circuit diagram of the invention.
Wherein: 1- battery pack;2- anode relay;3- cathode relay;4- bleeder circuit;5-A/D converting unit;6- every From communication unit;7- micro-control unit;41- first resistor;42- second resistance;43- 3rd resistor;10- isolated power supply;A- electricity Press collection point;B- sample reference.
Specific embodiment
As used some vocabulary to censure specific components in the specification and claims.Those skilled in the art answer It is understood that hardware manufacturer may call the same component with different nouns.This specification and claims are not with name The difference of title is as the mode for distinguishing component, but with the difference of component functionally as the criterion of differentiation.Such as logical The "comprising" of piece specification and claim mentioned in is an open language, therefore should be construed to " include but do not limit In "." substantially " refer within an acceptable error range, those skilled in the art can solve technology within a certain error range Problem basically reaches technical effect.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", level " The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, be merely for convenience of the description present invention and Simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construction And operation, therefore be not considered as limiting the invention.
In invention unless specifically defined or limited otherwise, the arts such as term " installation ", " connected ", " connection ", " fixation " Language shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected;It can be machine Tool connection, is also possible to be electrically connected;It can be directly connected, two members can also be can be indirectly connected through an intermediary Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be Concrete meaning in bright.
Below in conjunction with attached drawing, invention is further described in detail, but not as a limitation of the invention.
Embodiment 1
As shown in Figure 1 and 2, a kind of detection circuit that high voltage negative relay is adhered, including battery pack 1, it is connected to battery pack The positive relay 2 and cathode relay 3 of 1 total anode, total cathode further include connecting total anode and 3 output end of cathode relay Bleeder circuit 4, with bleeder circuit 4 be electrically connected A/D converting unit 5, with A/D converting unit 5 electrical connection communication unit is isolated Member 6 and with micro-control unit 7 that the electrical connection of communication unit 6 be isolated, bleeder circuit 4 includes concatenated first resistor unit and the Two resistance units, one end of first resistor unit are connected to total anode, and second resistance unit is connected to the output of cathode relay 3 End is provided with voltage acquisition point a, voltage acquisition point a and A/D converting unit 5 between first resistor unit and second resistance unit Input terminal electrical connection, with being provided with sample reference b between second resistance unit and the output end of cathode relay 3.
Wherein first resistor unit primarily serves the effect of partial pressure, therefore the requirement of the resistance value of first resistor unit is very big, and the The resistance value of two resistance units is relatively small.In view of the pressure resistance of resistance, in this present embodiment, first resistor unit takes two electricity Hinder concatenated design.Specifically, first resistor unit includes first resistor 41 and second resistance 42, second resistance unit includes the Three resistance 43, that is to say, that bleeder circuit 4 includes first resistor 41, second resistance 42 and the 3rd resistor 43 being sequentially connected in series, the One end of one resistance 41 is connected to total anode, and voltage acquisition point a is provided between second resistance 42 and 3rd resistor 43, and voltage is adopted Collection point a is electrically connected with the input terminal of A/D converting unit 5, is provided with and is adopted between 3rd resistor 43 and the output end of cathode relay 3 Sample is with reference to ground b.Since first resistor 41 and second resistance 42 primarily serve the effect of partial pressure, in this present embodiment, first resistor 41 resistance value is 2M Ω, and the resistance value of second resistance 42 is 2M Ω, and the resistance value of 3rd resistor 43 is 10K Ω, but the present invention is not with this It is limited, the specific resistance value of resistance number and corresponding resistor that first resistor unit and second resistance unit are specifically arranged can be according to reality Border needs to be configured;A/D converting unit 5 is used to acquire the voltage at second resistance unit (3rd resistor 43) both ends, and by mould Quasi- signal is converted to digital signal, isolation communication unit 6 is sent to, preferably, the model ADS1115 of A/D conversion unit 5; Isolation communication unit 6 is used to the digital signal received carrying out isolation processing, is then sent to micro-control unit 7, simultaneously also It can ensure that micro-control unit 7 is not influenced by high-pressure section failure, improve the safety coefficient of system, preferably, isolation communication unit The model ADuM1251ARZ of member 6;Micro-control unit 7 is by judging that real-time digital signal value obtains cathode relay 3 The digital signal value received is specifically compared with the value of setting, the state of cathode relay 3 is judged with this by state It is whether normal, so the monitoring of the state of cathode relay 3 can be improved the stability and reliability of the circuit system of battery;If The state of cathode relay 3 is abnormal, and micro-control unit 7 prompts operator by warning device, improves the safety of maintenance personal Property, help to prevent personnel from accidentally touching equipment and causing casualty accident.Preferably, micro-control unit 7 is designed using AT89S52 Single-chip minimum system.
Preferably, with sample reference b is electrically connected the ground terminal of A/D converting unit 5 and isolation communication unit 6.A/D turns Unit 5 and isolation communication unit 6 with same sample reference b are changed, can reduce the noise jamming in signal transmission.
Preferably, detection circuit further includes isolated power supply 10, A/D converting unit 5, isolation communication unit 6 and microcontroller list Member 7 is electrically connected with isolated power supply 10.The power input of A/D converting unit 5, isolation communication unit 6 and micro-control unit 7 is equal It is connected to isolated power supply 10, can reduce the influence of noise in signal transmission in this way, improve the stability of digital signal.
Preferably, A/D converting unit 5, isolation communication unit 6, micro-control unit 7 are logical by clock communication line and data Letter line carries out data transmission.Data telecommunication line SDA is bidirectional data line, and clock communication line SCL is clock line, in I2C bus Data are transmitted, send highest order first, such as: enabling signal being issued by host, SDA is by high level jump between SCL high period Then low level is sent the data of a byte by host;Data Transfer Done issues stop signal by host, and SDA is in SCL Being jumped between high period by low level is high level, i.e. the transmission of realization orderly information.
Preferably, positive relay 2 and cathode relay 3 are single-contact relay.Single-contact relay structure compares Simply, facilitate maintenance personal to repair circuit.
Preferably, detection circuit further includes warning device, and warning device is electrically connected with micro-control unit 7.Warning device is used In prompt operator or maintenance personal, helps to find that cathode relay 3 is adhered in advance, improve the safety of battery.
Preferably, micro-control unit 7 is electrically connected with cathode relay 3.Micro-control unit 7 can control cathode relay 3 Closing or opening.
Micro-control unit 7 uses single-chip microcontroller or PLC control device.Single-chip microcontroller is using very large scale integration technology handle Central processor CPU, random access memory ram, read only memory ROM, a variety of I/O mouthfuls and interruption systems with data-handling capacity The circuits collection such as system, timer/counter, display driver circuit, pulse-width modulation circuit, analog multiplexer and A/D converter At to the small and perfect microcomputer system constituted on one piece of silicon wafer, it is widely applied in industrial control field;PLC control Device processed has the characteristics that versatile, easy to use, to adapt to wide, high reliablity, strong antijamming capability, programming simple, because This, using single-chip microcontroller or PLC control device as micro-control unit 7.
Embodiment 2
As shown in Figure 1 and 2, a kind of detection method that high voltage negative relay is adhered, includes the following steps:
1) A/D converting unit 5 acquires voltage of the electric car in voltage acquisition point a in power process and sample reference between b Then Uab converts analog signals into digital signal, and be sent to isolation communication unit 6;
2) received signal is carried out isolation processing by isolation communication unit 6, and is sent to micro-control unit 7;
3) according to voltage acquisition point a in power process and sample reference the voltage Uab between b of micro-control unit 7, judges cathode Whether relay 3 is adhered, if cathode relay 3 is adhered, micro-control unit 7 can send prompt or warning by warning device To operator or maintenance personal.
The method that cathode relay is adhered is judged in step 3), is included the following steps:
If entire car controller has sent 1 power-on command of battery pack, and Uab > 0, then 3 normally closed of cathode relay is judged;
If entire car controller has sent 1 power off command of battery pack, and Uab=0, then judge that cathode relay 3 normally disconnects;
If entire car controller has sent 1 power off command of battery pack, and Uab > 0, then judge that cathode relay 3 is adhered.
It should be noted that: in detection method of the invention, step 1) voltage acquisition point a and sample reference between b Voltage Uab be actually the voltage at second resistance unit (i.e. 3rd resistor 43) both ends is sampled, A/D converting unit 5 Voltage Uab is monitored in real time, and is translated into digital signal;Step 2) is isolated communication unit 6 and is suitable for complicated circuit Between communication isolating, communication efficiency can not only be improved, moreover it is possible to enhance the applicable performance of circuit;Step 3) is due to cathode relay 3 disconnect after can in sample reference b generate Zero potential reference, and one end of second resistance unit (i.e. 3rd resistor 43) with adopt Sample is connected with reference to ground b, thus sample reference voltage between b and voltage acquisition point a can be used for judging that cathode relay 3 is It is no to be adhered, increase warning device, operator or maintenance personal can have found that cathode relay 3 is adhered in time, not only improve battery Service life, moreover it is possible to reduce the probability of safety accident.
It should be noted that the detection circuit that is adhered of high voltage negative relay provided by the above embodiment detection cathode after When electric appliance is adhered, only the example of the division of the above functional modules, in practical application, can according to need and will be upper State function distribution by different functional modules, to complete all or part of the functions described above.In addition, above-described embodiment mentions The detection circuit that the detection method and high voltage negative relay that the high voltage negative relay of confession is adhered are adhered belongs to same technology structure Think, specific implementation process is detailed in Installation practice, and details are not described herein.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party Formula is changed and is modified.Therefore, the invention is not limited to above-mentioned specific embodiment, all those skilled in the art exist Made any conspicuous improvement, replacement or modification all belong to the scope of protection of the present invention on the basis of the present invention.This Outside, although using some specific terms in this specification, these terms are merely for convenience of description, not to the present invention Constitute any restrictions.

Claims (10)

1. a kind of detection circuit that high voltage negative relay is adhered, including battery pack (1), it is connected to the battery pack (1) The positive relay (2) and cathode relay (3) of total anode, total cathode, it is characterised in that: further include connection total anode with The bleeder circuit (4) of cathode relay (3) output end, the A/D converting unit (5) being electrically connected with the bleeder circuit (4), With the A/D converting unit (5) electrical connection be isolated communication unit (6) and with it is described be isolated communication unit (6) be electrically connected it is micro- Control unit (7), the bleeder circuit (4) include concatenated first resistor unit and second resistance unit, the first resistor One end of unit is connected to total anode, is provided with voltage between the first resistor unit and the second resistance unit and adopts Collect point a, the voltage acquisition point a is electrically connected with the input terminal of the A/D converting unit (5), the second resistance unit and institute State between the output end of cathode relay (3) with being provided with sample reference b.
2. a kind of detection circuit that high voltage negative relay is adhered as described in claim 1, it is characterised in that: first electricity Hindering unit includes first resistor (41) and second resistance (42), and the second resistance unit includes 3rd resistor (43), and described the One end of one resistance (41) is connected to total anode, is provided between the second resistance (42) and the 3rd resistor (43) The voltage acquisition point a, is provided with the sampling between the 3rd resistor (43) and the output end of the cathode relay (3) With reference to ground b.
3. a kind of detection circuit that high voltage negative relay is adhered as described in claim 1, it is characterised in that: the A/D turns Change unit (5) and it is described isolation communication unit (6) ground terminal with the sample reference b is electrically connected.
4. a kind of detection circuit that high voltage negative relay is adhered as described in claim 1, it is characterised in that: the detection electricity Road further includes isolated power supply (10), the A/D converting unit (5), the isolation communication unit (6) and the micro-control unit (7) it is electrically connected with the isolated power supply (10).
5. a kind of detection circuit that high voltage negative relay is adhered as described in claim 1, it is characterised in that: the A/D turns Change unit (5), the isolation communication unit (6), the micro-control unit (7) by clock communication line and data telecommunication line into The transmission of row data.
6. a kind of detection circuit that high voltage negative relay is adhered as described in claim 1, it is characterised in that: the anode after Electric appliance (2) and the cathode relay (3) are single-contact relay.
7. a kind of detection circuit that high voltage negative relay is adhered as described in claim 1, it is characterised in that: the detection electricity Road further includes warning device, and the warning device is electrically connected with the micro-control unit (7).
8. a kind of detection circuit that high voltage negative relay is adhered as described in claim 1, it is characterised in that: the microcontroller Unit (7) is electrically connected with the cathode relay (3).
9. a kind of detection method that high voltage negative relay is adhered, which comprises the steps of:
1) A/D converting unit (5) acquisition electric car in voltage acquisition point a in power process and sample reference the electricity between b Uab is pressed, digital signal is then converted analog signals into, and is sent to isolation communication unit (6);
2) received signal is carried out isolation processing by isolation communication unit (6), and is sent to micro-control unit (7);
3) according to voltage acquisition point a in power process and sample reference the voltage Uab between b, judgement are negative for micro-control unit (7) Whether pole relay (3) is adhered.
10. a kind of detection method that high voltage negative relay is adhered as claimed in claim 9, it is characterised in that: in step 3) Judge the method that cathode relay is adhered, includes the following steps:
If entire car controller has sent battery pack (1) power-on command, and Uab > 0, then the cathode relay (3) is being judged just Normally closed conjunction;
If entire car controller has sent battery pack (1) power off command, and Uab=0, then the cathode relay (3) is being judged just Normal off is opened;
If entire car controller has sent battery pack (1) power off command, and Uab > 0, then judge that the cathode relay (3) is glutinous Even.
CN201811184419.1A 2018-10-11 2018-10-11 A kind of detection circuit and its detection method that high voltage negative relay is adhered Pending CN109188266A (en)

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Application Number Priority Date Filing Date Title
CN201811184419.1A CN109188266A (en) 2018-10-11 2018-10-11 A kind of detection circuit and its detection method that high voltage negative relay is adhered

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Publication Number Publication Date
CN109188266A true CN109188266A (en) 2019-01-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110261766A (en) * 2019-06-13 2019-09-20 奇瑞汽车股份有限公司 Relay is adhered observation circuit and monitoring method
CN111707934A (en) * 2020-05-14 2020-09-25 华为技术有限公司 Switch detector, use method of switch detector and vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110261766A (en) * 2019-06-13 2019-09-20 奇瑞汽车股份有限公司 Relay is adhered observation circuit and monitoring method
CN111707934A (en) * 2020-05-14 2020-09-25 华为技术有限公司 Switch detector, use method of switch detector and vehicle

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