CN206575192U - Clock synchronization circuit of battery management system of electric automobile - Google Patents
Clock synchronization circuit of battery management system of electric automobile Download PDFInfo
- Publication number
- CN206575192U CN206575192U CN201720277893.3U CN201720277893U CN206575192U CN 206575192 U CN206575192 U CN 206575192U CN 201720277893 U CN201720277893 U CN 201720277893U CN 206575192 U CN206575192 U CN 206575192U
- Authority
- CN
- China
- Prior art keywords
- chip
- pins
- clock
- diode
- clock synchronization
- 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.)
- Active
Links
- 230000006837 decompression Effects 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model relates to an electric automobile battery management system clock synchronizing circuit, including DC/DC step-down unit and clock synchronizing unit, DC/DC step-down unit is including step-down chip U1, step-down chip U1's GNDF and GNDS pin ground connection, step-down chip U1's EN pin links to each other with the 5V power through resistance R1, step-down chip U1's OUTF pin is through two parallelly connected electric capacity C1, C2 ground connection, step-down chip U1's OUTS pin links to each other with the 3.3V power, step-down chip U1's IN pin is through two parallelly connected electric capacity C3, C4 ground connection, and this step-down chip U1's IN pin links to each other with the 5V power. The utility model discloses a no matter winter or summer, the deviation of clock one day remains throughout within 0.5S, and the precision of clock can not appear unusually, realizes the clock through IIC communication and shows, has not only reduced stand-by power consumption, has also reduced the work load of follow-up software, has shortened the development cycle of product simultaneously greatly.
Description
Technical field
The utility model is related to battery management system technical field, and in particular to during a kind of cell management system of electric automobile
Clock synchronous circuit.
Background technology
In allegro modern society, the time becomes more and more valuable, for the Electronic Design of clock, high-precision and low work(
Consumption is increasingly becoming main flow, and our former RTC solution is to use passive crystal oscillator, and time showing is realized by software algorithm,
Need CPU to support during using passive crystal oscillator, and because time counting will be run always, cause complete machine stand-by power consumption to increase, in addition,
The deviation of passive crystal oscillator can change with the change of temperature, this may result in the precision of clock display winter and summer not
Together, during most serious, the clock deviation of one day can reach 8.6S, and user will easily perceive that the precision of clock display is problematic,
Have a strong impact on the usage experience of user.
Utility model content
The purpose of this utility model is to provide a kind of cell management system of electric automobile clock synchronization circuit, reduction clock
Deviation and stand-by power consumption, reduce the workload of subsequent software, substantially reduce the construction cycle of product.
To achieve the above object, the utility model employs following technical scheme：It is same including DC/DC pressure units and clock
Unit is walked, the DC/DC pressure units include decompression chip U1, the decompression chip U1 GNDF pins ground connection, are depressured chip
U1 GNDS pins are connected with clock synchronization unit, and decompression chip U1 EN pins are connected through resistance R1 with 5V power supplys, are depressured core
Piece U1 OUTF pins are grounded through two electric capacity C1, C2 in parallel, and decompression chip U1 OUTS pins are connected with 3.3V power supplys, are depressured
Chip U1 IN pins are grounded through two electric capacity C3, C4 in parallel, and pressure chip U1 IN pins are connected with 5V power supplys.
The clock synchronization unit includes clock synchronizing chip U2, diode D1, diode D2, rechargeable battery BT1, described
Clock synchronizing chip U2 FOE ends are grounded through resistance R2, and clock synchronizing chip U2 VDD pins are through two electric capacity C5, C6 in parallel
It is grounded and the pin is connected with 5V power supplys, clock synchronizing chip U2 VBAT pins is connected with diode D2 negative electrode, described two
Pole pipe D2 anode is connected through resistance R4 with rechargeable battery BT1 positive pole, rechargeable battery BT1 negative pole ground connection, rechargeable battery BT1
Positive pole be grounded through electric capacity C7, clock synchronizing chip U2 SCL pins are connected through resistance R6 with 5V power supplys, clock synchronizing chip U2
INT pins and SDA pins be connected respectively through resistance R3, R5 with 5V power supplys, clock synchronizing chip U2 GND pin ground connection, institute
The anode for stating diode D2 is connected with diode D1 negative electrode, the GNDS pins of the anode and decompression chip U1 of the diode D1
It is connected.
The model automotive grade MAX6071BAUT33+T of the decompression chip U1.
The model automotive grade RA8900CE of the clock synchronizing chip U2.
As shown from the above technical solution, the utility model uses DC/DC pressure units and clock synchronization unit and cell tube
The single-chip microcomputer of reason system is connected, and makes circuit output voltage stable and accuracy is high, DC/DC reduction voltage circuits are depressured core using automotive grade
Piece exports 3.3V voltages, and the chip precision can reach ± 0.04%, and accuracy a height of rechargeable battery BT1 provide stable work
Make voltage, and the DC/DC reduction voltage circuits quiescent dissipation, than relatively low only 150uA, clock accuracy is high and low in energy consumption.Clock is same
Step circuit uses the automotive grade clock chip of AEC-Q200 standards, is the high-precision number of degrees of an integrated 32.768KHz crystal unit
Word temperature compensated oscillator, total temperature range frequencies deviation is 5ppm, and accuracy height can reach 0.5S, this clock synchronization circuit
The data of clock chip internal register are extracted, clock display is realized by IIC communications, stand-by power consumption is so not only reduced,
The workload of software is decreased, the construction cycle of product is substantially reduced, and power dissipation ratio is relatively low only needs 0.7uA work electricity
Stream.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings：
As shown in figure 1, the cell management system of electric automobile clock synchronization circuit of the present embodiment, including DC/DC decompressions are single
Member 1 and clock synchronization unit 2, DC/DC pressure units 1 include decompression chip U1, decompression chip U1 model automotive grade
MAX6071BAUT33+T, decompression chip U1 GNDF and GNDS pins ground connection, decompression chip U1 EN pins are through resistance R1 and 5V
Power supply is connected, and decompression chip U1 OUTF pins are grounded through two electric capacity C1, C2 in parallel, decompression chip U1 OUTS pin clocks
Synchronization unit 2 is connected, and decompression chip U1 IN pins are grounded through two electric capacity C3, C4 in parallel, and pressure chip U1 IN pins
It is connected with 5V power supplys.DC/DC pressure units 1 are used to 5V voltages switching to 3.3V voltages, and stabilization is provided for rechargeable battery BT1
Operating voltage, the clock synchronizing chip of clock synchronization unit 2 and single-chip microcomputer realize clock display by IIC communications, so not only drop
Low stand-by power consumption, decreases the workload of software, substantially reduces the construction cycle of product.Electric capacity C3 and electric capacity C4 are to defeated
Enter+5V voltages and carry out high and low frequency filtering, electric capacity C1 and electric capacity C2 carry out high and low frequency filtering to output 3.3V voltages, defeated
Going out voltage accuracy can reach that 0.04% provides stable work electricity after capacitor filtering is handled to rechargeable battery BT1 simultaneously
Pressure.
Clock synchronization unit 2 includes clock synchronizing chip U2, diode D1, diode D2, rechargeable battery BT1, the clock
Synchronizing chip U2 model automotive grade RA8900CE.Clock synchronizing chip U2 FOE ends are grounded through resistance R2, clock synchronization core
Piece U2 VDD pins are connected through two electric capacity C5, C6 ground connection in parallel and the pin with 5V power supplys, clock synchronizing chip U2's
VBAT pins are connected with diode D2 negative electrode, and diode D2 anode is connected through resistance R4 with rechargeable battery BT1 positive pole, fills
Battery BT1 negative pole ground connection, rechargeable battery BT1 positive pole is grounded through electric capacity C7, and clock synchronizing chip U2 SCL pins are through electricity
Resistance R6 is connected with 5V power supplys, and clock synchronizing chip U2 INT pins and SDA pins are connected through resistance R3, R5 with 5V power supplys respectively,
Clock synchronizing chip U2 GND pin ground connection, diode D2 anode is connected with diode D1 negative electrode, diode D1 anode
It is connected with 3.3V power supplys.Clock synchronizing chip U2 INT pins are connected with interrupt signal _ RTC of single-chip microcomputer, clock synchronizing chip
U2 SCL pins are connected with Singlechip clock signal SCL_RTC.
Operation principle：The utility model battery management system clock synchronization circuit exports 3.3V using automotive grade reduction voltage circuit
Voltage, stable operating voltage is provided for rechargeable battery BT1, when DC/DC pressure units 1 export 3.3V, in order to which prevent can
Rechargeable battery is overcharged, and is exported and is charged to rechargeable battery BT1 by diode D1, and the clock synchronization unit 2 of automotive grade is using integrated
Formula, clock synchronizing chip U2 when clock synchronizing chip U2 normal works, gives clock synchronous core using outside+5V voltages
Piece U2 chip power supplies, rechargeable battery BT1 is to clock synchronizing chip U2 chips are as standby when outside+5V voltages disconnect
With power supply, clock synchronizing chip U2 chip normal works can be allowed, it is ensured that the accuracy of time.The signal of single-chip microcomputer is accessed simultaneously
All access pull-up resistor provides a stable voltage to these signals, and extracts the number of clock synchronizing chip U2 internal registers
According to, by IIC communication realize clock display, not only reduce stand-by power consumption, decrease the workload of software, substantially reduce
The construction cycle of product, clock accuracy height can be reached within 0.5S, and power dissipation ratio is relatively low only needs 0.7uA work electricity
Stream.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New scope is defined, on the premise of the utility model design spirit is not departed from, and those of ordinary skill in the art are to this
Various modifications and improvement that the technical scheme of utility model is made, all should fall into the protection of the utility model claims determination
In the range of.
Claims (4)
1. a kind of cell management system of electric automobile clock synchronization circuit, it is characterised in that：Including DC/DC pressure units and clock
Synchronization unit, the DC/DC pressure units include decompression chip U1, the decompression chip U1 GNDF pins ground connection, are depressured core
Piece U1 GNDS pins are connected with clock synchronization unit, and decompression chip U1 EN pins are connected through resistance R1 with 5V power supplys, are depressured
Chip U1 OUTF pins are grounded through two electric capacity C1, C2 in parallel, and decompression chip U1 OUTS pins are connected with 3.3V power supplys, drop
Chip U1 IN pins are pressed to be grounded through two electric capacity C3, C4 in parallel, and pressure chip U1 IN pins are connected with 5V power supplys.
2. cell management system of electric automobile clock synchronization circuit according to claim 1, it is characterised in that：The clock
Synchronization unit includes clock synchronizing chip U2, diode D1, diode D2, rechargeable battery BT1, the clock synchronizing chip U2's
FOE ends are grounded through resistance R2, and clock synchronizing chip U2 VDD pins are through two electric capacity C5, C6 ground connection in parallel and the pin and 5V
Power supply is connected, and clock synchronizing chip U2 VBAT pins are connected with diode D2 negative electrode, and the anode of the diode D2 is through electricity
Resistance R4 is connected with rechargeable battery BT1 positive pole, and rechargeable battery BT1 negative pole ground connection, rechargeable battery BT1 positive pole connects through electric capacity C7
Ground, clock synchronizing chip U2 SCL pins are connected through resistance R6 with 5V power supplys, and clock synchronizing chip U2 INT pins and SDA draw
Pin is connected through resistance R3, R5 with 5V power supplys respectively, clock synchronizing chip U2 GND pin ground connection, the anode of the diode D2
It is connected with diode D1 negative electrode, the anode of the diode D1 is connected with being depressured chip U1 GNDS pins.
3. cell management system of electric automobile clock synchronization circuit according to claim 1, it is characterised in that：The decompression
Chip U1 model automotive grade MAX6071BAUT33+T.
4. cell management system of electric automobile clock synchronization circuit according to claim 2, it is characterised in that：The clock
Synchronizing chip U2 model automotive grade RA8900CE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720277893.3U CN206575192U (en) | 2017-03-21 | 2017-03-21 | Clock synchronization circuit of battery management system of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720277893.3U CN206575192U (en) | 2017-03-21 | 2017-03-21 | Clock synchronization circuit of battery management system of electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206575192U true CN206575192U (en) | 2017-10-20 |
Family
ID=60055919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720277893.3U Active CN206575192U (en) | 2017-03-21 | 2017-03-21 | Clock synchronization circuit of battery management system of electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206575192U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611076A (en) * | 2018-11-02 | 2019-04-12 | 贝兹维仪器(苏州)有限公司 | A kind of real-time clock synchronous method of well logging device |
| CN111766774A (en) * | 2020-06-24 | 2020-10-13 | 东风电驱动系统有限公司 | Low-power-consumption vehicle-mounted clock device |
| CN112217273A (en) * | 2019-12-30 | 2021-01-12 | 蜂巢能源科技有限公司 | Monitoring method and monitoring device for battery management system |
-
2017
- 2017-03-21 CN CN201720277893.3U patent/CN206575192U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109611076A (en) * | 2018-11-02 | 2019-04-12 | 贝兹维仪器(苏州)有限公司 | A kind of real-time clock synchronous method of well logging device |
| CN112217273A (en) * | 2019-12-30 | 2021-01-12 | 蜂巢能源科技有限公司 | Monitoring method and monitoring device for battery management system |
| CN112217273B (en) * | 2019-12-30 | 2022-04-08 | 蜂巢能源科技有限公司 | Monitoring method and monitoring device for battery management system |
| CN111766774A (en) * | 2020-06-24 | 2020-10-13 | 东风电驱动系统有限公司 | Low-power-consumption vehicle-mounted clock device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106371334B (en) | A kind of Power-up/down time sequence control circuit and power-supply system | |
| CN104319996A (en) | Synchronous rectification step-down converter chip with high-precision current detection function | |
| CN206575192U (en) | Clock synchronization circuit of battery management system of electric automobile | |
| CN102692948B (en) | The real-time clock low power consumpting controling circuit that SOC (system on a chip) realizes | |
| CN204271914U (en) | A kind of synchronous rectification step-down controller chip that there is high-precision current and detect | |
| CN205283193U (en) | Battery management system's timing activation circuit | |
| CN103226376A (en) | High-precision real-time clock chip | |
| US20210351693A1 (en) | High energy efficiency switched-capacitor power converter | |
| CN201726170U (en) | Power supply with wakeup function | |
| CN206149153U (en) | Clock circuit | |
| CN206323170U (en) | A kind of intelligent power supply circuit for car-mounted terminal | |
| CN204832830U (en) | Upper and lower electric time schedule control circuit and electrical power generating system | |
| CN208112325U (en) | The super capacitor application circuit of battery changeable type intelligent electric energy meter power supply | |
| CN203951241U (en) | A kind of constant-current source circuit | |
| CN205157599U (en) | Guide tracked three -phase electric energy meter | |
| CN203178845U (en) | High precision real-time clock chip | |
| CN206117246U (en) | Supply circuit of intelligence bracelet | |
| CN203747473U (en) | Dedicated chip integrating linear charging and constant-voltage output | |
| CN104914712A (en) | Self-sustaining clock module with energy storage function | |
| CN207992869U (en) | A kind of device extending the main board for notebook computer button cell service life | |
| CN202421474U (en) | LCD battery power display circuit | |
| CN202190255U (en) | High-precision oscillator | |
| CN107356791B (en) | Single-phase intelligent ammeter of removable battery | |
| CN212343417U (en) | Power chip management protection circuit | |
| CN203324453U (en) | CMOS coulombmeter remaining electricity quantity display circuit of mobile power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |