CN207560032U - The network device of annular differential communication - Google Patents
The network device of annular differential communication Download PDFInfo
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- CN207560032U CN207560032U CN201721585384.3U CN201721585384U CN207560032U CN 207560032 U CN207560032 U CN 207560032U CN 201721585384 U CN201721585384 U CN 201721585384U CN 207560032 U CN207560032 U CN 207560032U
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- differential communication
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Abstract
A kind of network device of annular differential communication, including MCU module, two SPI turn differential communication high-speed transitions chip, eight BMS daisy chain differential communication modules, eight BMS differential communications block coupled in series connections, any one of differential communication module is respectively respectively connected with battery controller, first input/output terminal of MCU module turns differential communication high-speed transitions chip by the first SPI and is connected with eight BMS daisy chain differential communication modules, the BMS daisy chain differential communication modules divide communication module and the second input/output terminal of MCU module to be connected to form a ring topology by the 2nd SPI slips.The utility model uses daisy chain differential communication, has the characteristics that easily to realize low cost from the exploitation of hardware and software, annular communication modes reliability is compared with CAN highers.Meanwhile circuit design is simple, parameter regulation is convenient, and stability is strong, convenient for application.
Description
Technical field
The utility model is related to the differential communication technologies of BMS in electricity field more particularly to automotive electronics, particularly a kind of
The network device of annular differential communication.
Background technology
In the prior art, communication Design scheme is broadly divided into two kinds between BMS master/slave boards, and one kind is CAN communication, and CAN leads to
News are a kind of communications protocol that developed by Bosch, are used heavily in vehicle electric field.CAN bus data transmission
Reliability is high, and in BMS systems, since electric vehicle has the largely noise harassing and wrecking from motor, the anti-interference energy of CAN in itself
The advantage of power can greatly be amplified, but this scheme need from plate be equipped with MCU and transceiver chips, circuit into
This is higher.
Another kind is daisy chain differential communication.Difference daisy chain communicate relatively traditional CAN bus communication have it is at low cost,
The characteristics of easily realizing.Based on ASIC monomer sample circuits, using cascade connection means, can on this connection simultaneously or
Person selects certain several chip to be communicated, and can carry out automatic numbering and automatic identification to ASIC, does not need to carry out scoreboard
Hardware number, the quantity changeable of scoreboard and exchange, in addition, circuit cost is also low.
Daisy chain communication is simplified cascade mode, and using serial communication mode, which, which can transmit, comes independently
The control command of controller can also carry out data transmission with adjacent chips, and daisy chain communication is for multistage cell tube
Chip to be managed, there is automatic identification technology, does not need to carry out hardware establishment to scoreboard, the quantity of scoreboard arbitrarily can increase and decrease and exchange,
It is a major advantage that the ECP Extended Capabilities Port that centralized management is provided, circuit is simple, does not need to additional peripheral circuit, at low cost.But chrysanthemum
Same reference ground is not used because high-low pressure communicates, easily by reference ground voltage fluctuation in pattern chain communication mode poor anti jamming capability
Influence, and communication distance is limited, it is easy to cause to lose frame because communication distance is long.
Utility model content
The purpose of this utility model is to provide a kind of network device of annular differential communication, this annular difference
The network device of communication will solve that new energy car battery of the prior art management system cost is excessively high, New energy automobile motor
The technical issues of noise is big, harsh to stiffness of system requirement.
The network device of this annular differential communication of the utility model, turns differential communication including MCU module, the first SPI
High-speed transitions chip, the 2nd SPI turn differential communication high-speed transitions chip, eight BMS daisy chain differential communication modules, wherein, institute
The eight BMS daisy chain differential communications block coupled in series connection stated, any one of differential communication module are respectively connected with
Battery controller, the first input/output terminal of the MCU module by the first SPI turn differential communication high-speed transitions chip with
BMS daisy chain differential communication moulds the first differential communication module in the block is connected, and the BMS daisy chain differential communication moulds are in the block
8th differential communication module divides the second input/output terminal of communication module and MCU module to be connected to form one by the 2nd SPI slips
A ring topology.
Further, the first SPI turns differential communication high-speed transitions chip and second turn of differential communication high-speed transitions
Chip is MC33664 chips.
Further, the battery controller is made of MC33771 batteries control chip.
The utility model compares with prior art, and effect is positive and apparent.This annular of the utility model
The network device of differential communication uses distributed management system, comprising 8 BMS daisy chain differential communications, master control borad MCU module with
Turn differential communication high-speed transitions chip MC33664 by SPI from the communication between control plate differential communication module to complete, longest supports 5
Rice noodles beam can support the harness length of bus.After SPI signal switchs to differential signal by MCU33664, have between each single-point
Transformer isolation.Transformer possesses the isolating power of highest 3750Vrms, and can meet the communication speed of 2.0Mbps.Transformation
The magnetic coupling of device so that second level differential signal signal is more clean and can be effectively reduced in the case where offer is dielectrically separated from
External radiated noise.
MC33664 receives the sine wave signal that bit-by-bit is generated after the SPI signal of MCU, by the coding form of difference
It sends out, next node is issued in each clock falling edge by differential bus.When outside MC33664 since being controlled plate communication, MCU
Module sets low low effective enable bit, and MC33664 sends out an initial message, and comprising from the address information of control plate, being subsequently
From control plate initialization, a series of differential signals are generated in bus.It is produced on TX+ the and TX- lines of MC33664 in each clock cycle
Opposite one group of differential signal of sinusoidal wave component is given birth to, is each known in entire bus from control plate by the address sent out to MC33664
Not, it reads and the information of oneself is issued by master control borad MCU module, by replying master control borad information from the ASIC33771 chips of control plate.Often
After secondary communication, MCU module puts high enable bit.
Noise jamming is received from the RX_TX+ in control plate or a certain items of RX_TX- or two or rigid line is broken when 8
When, in principle behind it is all from control plate will be because of Communications failure and out of control.But the utility model optimizes traditional chrysanthemum
Chain communication topology, when MCU module is when perceiving no sufficient amount of quantity from plate on communication bus, can attempt from communication
The other end of LOOP is primary with being communicated again according to abovementioned steps from control plate, is possible to out of control because of differential communication thread breakage
It will get in touch from control plate from the other end of communication topology with master control borad, such safety measures also reach ASIL for whole system
The safe class of C plays the role of vital.
The characteristics of differential communication is easily realized is utilized in the utility model, has modified communication topology on this basis, utilizes NXP
Newest AFE(analog front end) MC33771 chips, employ ring topology as a result, increase component it is extremely limited in the case of,
Considerably increase the reliability of system.When certain communication all the way of differential communication is led because noise of motor interferes or occurs disconnecting
When causing communication unstable, system can be equivalent to from the tail bleeds taken communication data of annular communication and increase dual fail-safe for system,
The security and stability of holding system.
Description of the drawings
Fig. 1 is the connection diagram of the network device of the annular differential communication of the utility model.
Specific embodiment
Embodiment 1:
As shown in Figure 1, the network device of this annular differential communication of the utility model, including MCU module 1, the first SPI
Turn differential communication high-speed transitions chip 2, the 2nd SPI turns 3, eight BMS daisy chain differential communications of differential communication high-speed transitions chip
Module 5, wherein, described eight BMS daisy chain differential communications modules 5 are connected in series with, any one of differential communication mould
Block 5 is respectively connected with battery controller 4, and the first input/output terminal of the MCU module 1 is logical by the first SPI slips point
News high-speed transitions chip 2 is connected with the first differential communication module in BMS daisy chain differential communications module 5, the BMS chrysanthemums
The 8th differential communication module in chain differential communication module 5 divides the second of communication module 3 and MCU module 1 by the 2nd SPI slips
Input/output terminal is connected to form a ring topology.
Further, the first SPI turns differential communication high-speed transitions chip 2 and second turn of differential communication high-speed transitions
Chip 3 is MC33664 chips.
Further, the battery controller 4 is made of MC33771 batteries control chip.
The utility model uses daisy chain differential communication, has the spy for easily realizing low cost from the exploitation of hardware and software
Point, annular communication modes reliability is compared with CAN highers.In addition, the side that the utility model system makes exclusively for automobile electronics
Case, stability are strong.Meanwhile circuit design is simple, parameter regulation is convenient, convenient for application.
Claims (3)
1. a kind of network device of annular differential communication, turns differential communication high-speed transitions chip, the including MCU module, the first SPI
Two SPI turn differential communication high-speed transitions chip, eight BMS daisy chain differential communication modules, it is characterised in that：Described eight
BMS daisy chain differential communications block coupled in series connects, and any one of differential communication module is respectively connected with battery control
Device, the first input/output terminal of the MCU module turn differential communication high-speed transitions chip and BMS daisy chains by the first SPI
Differential communication mould the first differential communication module in the block is connected, BMS daisy chain differential communication moulds the 8th difference in the block
Communication module divides communication module and the second input/output terminal of MCU module to be connected to form an annular and open up by the 2nd SPI slips
It flutters.
2. the network device of annular differential communication as described in claim 1, it is characterised in that：The first SPI slips point
It is MC33664 chips to communicate high-speed transitions chip and second turn of differential communication high-speed transitions chip.
3. the network device of annular differential communication as described in claim 1, it is characterised in that：The battery controller by
MC33771 batteries control chip is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721585384.3U CN207560032U (en) | 2017-11-24 | 2017-11-24 | The network device of annular differential communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721585384.3U CN207560032U (en) | 2017-11-24 | 2017-11-24 | The network device of annular differential communication |
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| CN207560032U true CN207560032U (en) | 2018-06-29 |
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| CN201721585384.3U Active CN207560032U (en) | 2017-11-24 | 2017-11-24 | The network device of annular differential communication |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770025A (en) * | 2017-11-24 | 2018-03-06 | 延锋伟世通电子科技（上海）有限公司 | A kind of network device of annular differential communication |
| CN109308799A (en) * | 2018-11-13 | 2019-02-05 | 延锋伟世通电子科技（上海）有限公司 | The wired and wireless compatible means of communication and device for battery core monitoring device |
| CN110471877A (en) * | 2019-07-05 | 2019-11-19 | 深圳鹏申科技有限公司 | Daisy chain communication structure and communication means |
-
2017
- 2017-11-24 CN CN201721585384.3U patent/CN207560032U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770025A (en) * | 2017-11-24 | 2018-03-06 | 延锋伟世通电子科技（上海）有限公司 | A kind of network device of annular differential communication |
| CN109308799A (en) * | 2018-11-13 | 2019-02-05 | 延锋伟世通电子科技（上海）有限公司 | The wired and wireless compatible means of communication and device for battery core monitoring device |
| CN110471877A (en) * | 2019-07-05 | 2019-11-19 | 深圳鹏申科技有限公司 | Daisy chain communication structure and communication means |
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