CN208076672U - A kind of relay adhesion detection circuit for electric vehicle - Google Patents
A kind of relay adhesion detection circuit for electric vehicle Download PDFInfo
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- CN208076672U CN208076672U CN201820476184.2U CN201820476184U CN208076672U CN 208076672 U CN208076672 U CN 208076672U CN 201820476184 U CN201820476184 U CN 201820476184U CN 208076672 U CN208076672 U CN 208076672U
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Abstract
The utility model discloses a kind of relay adhesion detection circuits for electric vehicle, trigger threshold module is detected including adhesion, high-low pressure signal isolation trigger module and low-voltage signal acquisition module, the adhesion detection trigger threshold module and the high-low pressure signal isolation trigger module are serially connected, it is connected to when work in relay adhesion measure loop, the low-voltage signal acquisition module is coupled to the high-low pressure signal isolation trigger module, the adhesion detection trigger threshold module is connected when reaching scheduled adhesion detection threshold voltage, the high-low pressure signal isolation trigger module is used to trigger the low-voltage signal acquisition module work when the adhesion detects trigger threshold voltage turn-on, low pressure electric signal of the low-voltage signal acquisition module for judging whether generation relay adhesion to processing unit offer.This relay adhesion detection circuit makes relay adhesion detection reliable, and speed is fast, and flexibility is high.
Description
Technical field
The utility model is related to a kind of relay adhesion detection circuits for electric vehicle.
Background technology
Domestic electric vehicle industry development is rapid at present, and relay adhesion is also common in vehicle electric system asks
Topic, electric vehicle relay adhesion detection are mainly realized by BMS.There are two types of the detection modes of electric vehicle adhesion at present：Relay
Auxiliary contact are sent out and voltage acquisition method.Auxiliary contact mode needs special relay, and this relay is relative to common relay
Relative cost is higher for device, and such adhesion detection mode is limited by relay, in electric automobile high-voltage topology simultaneously
Non- popularization and application.For at present：More common mode is voltage acquisition method, typical electric automobile high-voltage topology such as Fig. 1 institutes
Show.Its specific work process is as follows：BMS after the power is turned on, collection voltages V1, V2, V3, V4.Voltage V2 and V1 make comparisons total to judge
Positive relay J2, preliminary filling relay J1 whether there is adhesion；Voltage V3 and V1 compare judge trickle charge relay J3 whether adhesion；
Voltage V4 and V1 compare judge fast charge relay J4 whether adhesion.Such adhesion detection mode is simple, and adhesion thresholding can
Oneself setting, is the universal adhesion detection modes of current BMS.
But there is also as following drawbacks for such relay adhesion detection mode：
(1) low side relay cannot be detected；
(2) for BMS, high pressure client information is acquired, needs to do isolated from power and signal, undoubtedly increases system
Cost；
(3) system string electricity problem, system can mutually go here and there voltage by BMS sampling resistors in some cases may initiation safety
Problem；
(4) A/D amount of acquisition channels is more, increases cpu load.
Utility model content
The main purpose of the utility model is that in view of the deficiencies of the prior art, providing a kind of relay for electric vehicle
Device adhesion detection circuit.
To achieve the above object, the utility model uses following technical scheme：
A kind of relay adhesion detection circuit for electric vehicle, including adhesion detection trigger threshold module, high-low pressure
Signal isolation trigger module and low-voltage signal acquisition module, the adhesion detection trigger threshold module and the high-low pressure signal
Isolation trigger module is serially connected, and when work is connected in relay adhesion measure loop, the low-voltage signal acquisition module coupling
The high-low pressure signal isolation trigger module is closed, the adhesion detection trigger threshold module is reaching scheduled adhesion detection door
It is connected when voltage limit, the high-low pressure signal isolation trigger module is used to touch when the adhesion detects trigger threshold voltage turn-on
Work of sending out low-voltage signal acquisition module described, the low-voltage signal acquisition module are used for processing unit offer judging whether
The low pressure electric signal of relay adhesion occurs.
Further：
Adhesion detection trigger threshold module includes the first zener diode being in series and first resistor, and described first
The cathode of zener diode connects the anode of the relay adhesion measure loop.
The first resistor is resistance value adjustable resistance.
It is also set on the series circuit of the adhesion detection trigger threshold module and the high-low pressure signal isolation trigger module
It is equipped with adhesion detection switch.
The adhesion detection switch setting detects trigger threshold module in the adhesion and the high-low pressure signal isolation is touched
Between hair module.
Further include the diode being arranged with the first zener diode differential concatenation, the cathode of the diode connects institute
State the negative terminal of relay adhesion measure loop.
The high-low pressure signal isolation trigger module is based on optocoupler realization with the low-voltage signal acquisition module and couples, described
High-low pressure signal isolation trigger module includes the primary side of the optocoupler, and the low-voltage signal acquisition module includes the secondary side of optocoupler,
The output end on the secondary side of the optocoupler is arranged in the signal acquisition point of the low-voltage signal acquisition module.
The low-voltage signal acquisition module further includes low-tension supply and the second zener diode, and the low-tension supply connects institute
The input terminal on the secondary side of optocoupler is stated, the output end on the secondary side of the optocoupler connects the cathode of second zener diode, described
The plus earth of second zener diode.
It is provided with second resistance between the optocoupler and second zener diode.
The utility model has the advantages that：
This relay adhesion detection circuit keeps the adhesion detection mode of relay relatively reliable.Using this scheme after
The speed of electric appliance adhesion detection circuit, adhesion detection is also very fast compared with traditional voltage acquisition method, and its class of insulation is high.It adopts
It is adjustable to be connected to the position corresponding to " HW+ " and " HW- " of different relays to realize with the relay adhesion detection circuit
Flash relay adhesion detects and low side relay adhesion detection, considerably increases the flexibility of system.
The advantages of the utility model specific embodiment, has：
1. " sinciput post-tensioning " adhesion detection mode is realized by the first zener diode and the second zener diode, wherein the
Two zener diodes stablize " post-tensioning " function, ensure the reliability of processing unit such as CPU identification level；
2. realizing that adhesion detection threshold is adjusted by the resistance value of the pressure value and first resistor that adjust the first zener diode；
3. realizing defencive function by the diode that differential concatenation is arranged, prevent back-pressure from damaging circuit；
4. by the way that adhesion detection switch is arranged, adhesion detection switch is closed when adhesion detects, and is detected without adhesion
When adhesion detection switch disconnect, eliminate influencing each other for adhesion detection circuit and system.
Description of the drawings
Fig. 1 is typical electric automobile high-voltage topology；
Fig. 2 is a kind of circuit structure diagram of embodiment of the utility model relay adhesion detection circuit.
Specific implementation mode
It elaborates below to the embodiment of the utility model.It is emphasized that following the description is only example
Property, rather than in order to limit the scope of the utility model and its application.
Referring to Fig.2, in one embodiment, a kind of relay adhesion detection circuit for electric vehicle, including adhesion
Detect trigger threshold module, high-low pressure signal isolation trigger module and low-voltage signal acquisition module, the adhesion detection triggering
Threshold module and the high-low pressure signal isolation trigger module are serially connected, and when work is connected to relay adhesion measure loop
In, the low-voltage signal acquisition module is coupled to the high-low pressure signal isolation trigger module, and the adhesion detects trigger threshold
Module is connected when reaching scheduled adhesion detection threshold voltage, and the high-low pressure signal isolation trigger module is used for described viscous
The low-voltage signal acquisition module work is even triggered when detection trigger threshold voltage turn-on, the low-voltage signal acquisition module is used for
To processing unit offer to judge whether occur relay adhesion low pressure electric signal.
As shown in Fig. 2, in a preferred embodiment, the adhesion detection trigger threshold module includes the first voltage stabilizing being in series
The cathode of diode D1 and first resistor R3, the first zener diode D1 are connecting the relay adhesion measure loop just
Hold HW+.It is highly preferred that the first resistor R3 is resistance value adjustable resistance.
In a preferred embodiment, adhesion detection trigger threshold module and the high-low pressure signal isolation trigger module
Adhesion detection switch K2 is additionally provided on series circuit.
In a preferred embodiment, adhesion detection switch K2 setting detects trigger threshold module and described in the adhesion
Between high-low pressure signal isolation trigger module.
In a preferred embodiment, relay adhesion detection circuit further includes and the first zener diode D1 differential concatenations
Diode D4, the diode D4 of setting, cathode connect the negative terminal HW- of the relay adhesion measure loop.
In a preferred embodiment, the high-low pressure signal isolation trigger module is based on light with the low-voltage signal acquisition module
Coupling U1 realizes coupling, and the high-low pressure signal isolation trigger module includes the primary side of the optocoupler U1, the low-voltage signal acquisition
Module includes the secondary side of optocoupler U1, and the signal acquisition point C of the low-voltage signal acquisition module is arranged on the secondary side of the optocoupler U1
Output end.
In a preferred embodiment, the low-voltage signal acquisition module further includes low-tension supply V and the second zener diode D3,
The low-tension supply V connects the input terminal on the secondary side of the optocoupler U1, the output end connection on the secondary side of the optocoupler U1 described the
The cathode of two zener diode D3, the plus earth of the second zener diode D3.
In a preferred embodiment, it is provided with second resistance between the optocoupler U1 and the second zener diode D3.
First zener diode D1 realizes " sinciput " function：A certain adhesion detection threshold is set, ensures voltage less than door
The first zener diode D1 is not turned on when limit value, to adhesion be caused to judge by accident.Adhesion detection threshold can be by adjusting first
The voltage stabilizing value of zener diode D1 and the resistance value of first resistor R3 are configured.Can be based on optocoupler U1 realize high and low voltage isolation and
Signal transmission.Second zener diode D3 realizes " post-tensioning " function：When voltage is more than the thresholding of the first zener diode D1 settings
It is worth, the faint conductings of optocoupler U1, at this time the secondary current very little of optocoupler U1, the second zener diode D3 is by this voltage stabilization at one
The level that processing unit such as MCU or CPU can be identified, to judge that adhesion detects；Diode D4 realizes defencive function, prevents relay
The back-pressure damage circuit formed when device is cut-off；By the way that adhesion detection switch K2 is arranged, when carrying out adhesion detection, adhesion detection
Switch K2 is closed, and when being detected without adhesion, adhesion detection switch K2 is disconnected, and eliminates influencing each other between circuit and system.
This relay adhesion detection circuit keeps the adhesion detection mode of relay relatively reliable.Using this scheme after
The speed of electric appliance adhesion detection circuit, adhesion detection is very fast compared with traditional voltage acquisition method, and the class of insulation is high.Using this
Relay adhesion detection circuit, the position of " HW+ " and " HW- " of adjustable connection come realize flash relay adhesion detection with it is low
Side relay adhesion detection, considerably increases the flexibility of system.
The above content is specific/preferred embodiment further detailed description of the utility model is combined, no
It can assert that the specific implementation of the utility model is confined to these explanations.For the common skill of the utility model technical field
For art personnel, without departing from the concept of the premise utility, the embodiment that these have been described can also be made
Some replacements or modification, and these are substituted or variant all shall be regarded as belonging to the scope of protection of the utility model.
Claims (9)
1. a kind of relay adhesion detection circuit for electric vehicle, which is characterized in that detect trigger threshold mould including adhesion
Block, high-low pressure signal isolation trigger module and low-voltage signal acquisition module, adhesion detection trigger threshold module and described
High-low pressure signal isolation trigger module is serially connected, and when work is connected in relay adhesion measure loop, the low-voltage signal
Acquisition module is coupled to the high-low pressure signal isolation trigger module, and the adhesion detection trigger threshold module is reaching scheduled
It is connected when adhesion detection threshold voltage, the high-low pressure signal isolation trigger module is used to ration the power supply in adhesion detection trigger gate
The low-voltage signal acquisition module work is triggered when pressure conducting, the low-voltage signal acquisition module is used to provide use to processing unit
To judge whether that the low pressure electric signal of relay adhesion occurs.
2. relay adhesion detection circuit as described in claim 1, which is characterized in that the adhesion detects trigger threshold module
Including the first zener diode being in series and first resistor, the cathode of first zener diode connects the relay and glues
The even anode of measure loop.
3. relay adhesion detection circuit as claimed in claim 2, which is characterized in that the first resistor is resistance value adjustable electric
Resistance.
4. the relay adhesion detection circuit as described in claims 1 or 2 or 3, which is characterized in that the adhesion detects trigger gate
It is additionally provided with adhesion detection switch on the series circuit of limit module and the high-low pressure signal isolation trigger module.
5. relay adhesion detection circuit as claimed in claim 4, which is characterized in that the adhesion detection switch is arranged in institute
It states between adhesion detection trigger threshold module and the high-low pressure signal isolation trigger module.
6. relay adhesion detection circuit as claimed in claim 2 or claim 3, which is characterized in that further include and first voltage stabilizing
The diode of diodes in reverse series setting, the cathode of the diode connect the negative terminal of the relay adhesion measure loop.
7. the relay adhesion detection circuit as described in claims 1 or 2 or 3, which is characterized in that the high-low pressure signal isolation
Trigger module is based on optocoupler realization with the low-voltage signal acquisition module and couples, and the high-low pressure signal isolation trigger module includes
The primary side of the optocoupler, the low-voltage signal acquisition module include the secondary side of optocoupler, the signal of the low-voltage signal acquisition module
The output end on the secondary side of the optocoupler is arranged in collection point.
8. relay adhesion detection circuit as claimed in claim 7, which is characterized in that the low-voltage signal acquisition module also wraps
Low-tension supply and the second zener diode are included, the low-tension supply connects the input terminal on the secondary side of the optocoupler, the optocoupler
The output end on secondary side connects the cathode of second zener diode, the plus earth of second zener diode.
9. relay adhesion detection circuit as claimed in claim 8, which is characterized in that the optocoupler and second voltage stabilizing two
Second resistance is provided between pole pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820476184.2U CN208076672U (en) | 2018-04-04 | 2018-04-04 | A kind of relay adhesion detection circuit for electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820476184.2U CN208076672U (en) | 2018-04-04 | 2018-04-04 | A kind of relay adhesion detection circuit for electric vehicle |
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| CN208076672U true CN208076672U (en) | 2018-11-09 |
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| CN201820476184.2U Active CN208076672U (en) | 2018-04-04 | 2018-04-04 | A kind of relay adhesion detection circuit for electric vehicle |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507236A (en) * | 2018-11-23 | 2019-03-22 | 歌尔股份有限公司 | Metal adhesive detection circuit and detection device |
| CN109507476A (en) * | 2018-12-25 | 2019-03-22 | 中国重汽集团济南动力有限公司 | A kind of high voltage connector front and back end voltage detecting system |
| CN109521359A (en) * | 2018-12-28 | 2019-03-26 | 华人运通控股有限公司 | A kind of negative relay status detection circuit of power battery master and method |
| CN109541452A (en) * | 2018-11-23 | 2019-03-29 | 深圳市麦澜创新科技有限公司 | Relay adhesion detection device and method, battery management system and electric car |
| CN111751720A (en) * | 2020-06-02 | 2020-10-09 | 安徽锐能科技有限公司 | High-voltage relay adhesion diagnosis circuit and high-voltage relay circuit |
| CN112526337A (en) * | 2020-12-08 | 2021-03-19 | 深圳威迈斯新能源股份有限公司 | Electric vehicle relay adhesion detection circuit and detection method thereof |
| CN113454473A (en) * | 2020-10-21 | 2021-09-28 | 深圳欣锐科技股份有限公司 | Main and negative relay detection system |
-
2018
- 2018-04-04 CN CN201820476184.2U patent/CN208076672U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507236A (en) * | 2018-11-23 | 2019-03-22 | 歌尔股份有限公司 | Metal adhesive detection circuit and detection device |
| CN109541452A (en) * | 2018-11-23 | 2019-03-29 | 深圳市麦澜创新科技有限公司 | Relay adhesion detection device and method, battery management system and electric car |
| CN109507476A (en) * | 2018-12-25 | 2019-03-22 | 中国重汽集团济南动力有限公司 | A kind of high voltage connector front and back end voltage detecting system |
| CN109521359A (en) * | 2018-12-28 | 2019-03-26 | 华人运通控股有限公司 | A kind of negative relay status detection circuit of power battery master and method |
| CN109521359B (en) * | 2018-12-28 | 2020-11-03 | 华人运通(江苏)动力电池***有限公司 | Power battery cathode relay state detection circuit and method |
| CN111751720A (en) * | 2020-06-02 | 2020-10-09 | 安徽锐能科技有限公司 | High-voltage relay adhesion diagnosis circuit and high-voltage relay circuit |
| CN113454473A (en) * | 2020-10-21 | 2021-09-28 | 深圳欣锐科技股份有限公司 | Main and negative relay detection system |
| CN112526337A (en) * | 2020-12-08 | 2021-03-19 | 深圳威迈斯新能源股份有限公司 | Electric vehicle relay adhesion detection circuit and detection method thereof |
| CN112526337B (en) * | 2020-12-08 | 2023-12-22 | 深圳威迈斯新能源股份有限公司 | Electric automobile relay adhesion detection circuit and detection method thereof |
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