CN108957336A - A kind of power battery high_voltage isolation measuring system based on AFE(analog front end) - Google Patents
A kind of power battery high_voltage isolation measuring system based on AFE(analog front end) Download PDFInfo
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- CN108957336A CN108957336A CN201810583560.2A CN201810583560A CN108957336A CN 108957336 A CN108957336 A CN 108957336A CN 201810583560 A CN201810583560 A CN 201810583560A CN 108957336 A CN108957336 A CN 108957336A
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- Prior art keywords
- afe
- battery pack
- analog switch
- input terminal
- voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- General Physics & Mathematics (AREA)
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Abstract
The power battery high_voltage isolation measuring system based on AFE(analog front end) that the invention discloses a kind of, voltage acquisition time applied to battery pack, it includes MCU, AFE chip and analog switch, MCU passes through I2C isolation and AFE chip communication connection, the output end of analog switch and the V1 end communication of AFE chip connect, analog switch includes total input terminal and at least one sub- input terminal, total input terminal is connected to the positive terminal of battery pack, sub- input terminal is connected to the positive terminal of single battery in battery pack, the negative pole end of battery pack connects and is grounded with the end GND of AFE chip, so that AFE chip, analog switch box battery pack constitutes circuit.The present invention avoids sample circuit calibration procedure, reduces production cost while guaranteeing voltage measurement accuracy.
Description
Technical field
The present invention relates to power battery monitoring technical field, especially a kind of power battery high pressure based on AFE(analog front end) every
From measuring system.
Background technique
Current driving force battery is formed in series and parallel by more piece single battery, and BMS not only will accurately measure single battery voltage,
Also total voltage of the battery after series-parallel is monitored.Relay adhesion monitoring, load electricity may be implemented by high pressure monitoring
Hold the high pressures safety managements such as pre-charge pressure monitoring, the high-voltage interlocking detection of high anti-interference ability, high-voltage isulation monitoring.
There are mainly two types of the prior arts:
1, signal of the battery-end total voltage after electric resistance partial pressure is given to by low-pressure side AD sampling by isolation amplifier.
2, it is given to dedicated A/D chip sampling after electric resistance partial pressure in high-pressure side total voltage, is then sent to by the way that communication is isolated
Low-pressure side MCU.
The prior art uses independent high pressure sample circuit, increases system cost.Isolation amplifier is due to being the line used
Property optocoupler, which is done, is isolated, acquisition precision and poor anti jamming capability, needs to do individual voltage calibration, high production cost, efficiency in production
It is low.
Summary of the invention
It is a kind of based on AFE(analog front end) the technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide
Power battery high_voltage isolation measuring system.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of power electric based on AFE(analog front end)
Pond high_voltage isolation measuring system, the voltage acquisition time applied to battery pack comprising MCU, AFE chip and analog switch, MCU
By I2C isolation and AFE chip communication connection, the output end of analog switch and the V1 end communication of AFE chip are connected, analog switch
Including the sub- input terminal of total input terminal and at least one, total input terminal is connected to the positive terminal of battery pack, and sub- input terminal is connected to battery
The positive terminal of single battery in group, the negative pole end of battery pack connects and is grounded with the end GND of AFE chip, so that AFE chip, mould
Quasi- switch enclosure battery pack constitutes circuit.
In above-mentioned technical proposal, the MCU is carried out the channel switching to analog switch, is divided with realizing by control sequential
When acquire.
In above-mentioned technical proposal, the I2C is isolated into the I2C isolation of optical coupling type.
The beneficial effects of the present invention are: using a kind of novel cost effective method, by power battery front-end sampling core
Piece first segment monomer battery voltage sampling channel increases analog switch, switches the partial pressure letter of total power battery voltage by switching
Number and single power battery voltage signal single power battery voltage and power electric reached by the time sharing sampling of front-end chip
The isolation of the total voltage in pond samples.Due to calibrated when the AD of battery front-end chip, which is sampled, to dispatch from the factory, guaranteeing that voltage measurement is smart
While spending, sample circuit calibration procedure is avoided, production cost is reduced.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
(present invention is Dongguan City introduction innovation Research Team programme support (project number: 2014607119)
Supported by DongGuan Innovative Research team Program
(NO:2014607119))。
As shown in Figure 1, a kind of power battery high_voltage isolation measuring system based on AFE(analog front end), the electricity applied to battery pack
Press acquisition time comprising MCU, AFE chip and analog switch, MCU are opened by I2C isolation and AFE chip communication connection, simulation
The output end of pass and the V1 end communication of AFE chip connect, and analog switch includes total input terminal and at least one sub- input terminal, total input
End is connected to the positive terminal of battery pack, and sub- input terminal is connected to the positive terminal of single battery in battery pack, the negative pole end of battery pack
Connect and be grounded with the end GND of AFE chip, so that AFE chip, analog switch box battery pack constitute circuit.The MCU passes through control
Timing processed carries out the channel switching to analog switch, to realize acquisition time.The I2C is isolated into the I2C isolation of optical coupling type.
Analog switch can make the multi-channel switch with changeable function of one or more of device compositions such as metal-oxide-semiconductor, relay.This
Battery pack in embodiment is to be connected in series by multiple single batteries.AFE chip is front end analogue chip.MCU is with data
The chip of processing function, such as: single-chip microcontroller etc..
The working principle of the invention: MCU controls analog switch address signal by optocoupler, logical for switching analoging switch
Road.Pass through MCU control sequential, switching analoging switch channel, by single-unit monomer battery voltage, assembled battery total voltage voltage division signal point
When be given to front-end chip acquisition.Then main control MCU is sent to by the isolation communication of AFE front-end chip.Complete the height of power battery
Pressure monitoring completes the high pressures security functions such as relay adhesion, insulating monitoring, high-voltage interlocking by MCU master control algorithm.
The above embodiments are merely illustrative and not limiting of the invention, therefore all according to described in present patent application range
The equivalent change or modification done of method, be included in the scope of the patent application of the present invention.
Claims (3)
1. a kind of power battery high_voltage isolation measuring system based on AFE(analog front end), applied to the voltage acquisition time of battery pack,
It is characterized by comprising MCU, AFE chip and analog switch, MCU passes through I2C isolation and AFE chip communication connection, analog switch
Output end and AFE chip V1 end communication connect, analog switch includes total input terminal and at least one sub- input terminal, total input terminal
Be connected to the positive terminal of battery pack, sub- input terminal is connected to the positive terminal of single battery in battery pack, the negative pole end of battery pack with
The end GND of AFE chip connects and is grounded, so that AFE chip, analog switch box battery pack constitute circuit.
2. a kind of power battery high_voltage isolation measuring system based on AFE(analog front end) according to claim 1, feature exist
In: the MCU carries out the channel switching to analog switch, by control sequential to realize acquisition time.
3. a kind of power battery high_voltage isolation measuring system based on AFE(analog front end) according to claim 1, feature exist
In: the I2C is isolated into the I2C isolation of optical coupling type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810583560.2A CN108957336A (en) | 2018-06-08 | 2018-06-08 | A kind of power battery high_voltage isolation measuring system based on AFE(analog front end) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810583560.2A CN108957336A (en) | 2018-06-08 | 2018-06-08 | A kind of power battery high_voltage isolation measuring system based on AFE(analog front end) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108957336A true CN108957336A (en) | 2018-12-07 |
Family
ID=64493689
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810583560.2A Pending CN108957336A (en) | 2018-06-08 | 2018-06-08 | A kind of power battery high_voltage isolation measuring system based on AFE(analog front end) |
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| Country | Link |
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| CN (1) | CN108957336A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986835A (en) * | 2021-03-25 | 2021-06-18 | 东风汽车集团股份有限公司 | Analog front end monitoring circuit of power battery |
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| KR20010018009A (en) * | 1999-08-17 | 2001-03-05 | 박종섭 | Asymmetric digital subscriber line system using Qswitch |
| CN101459267A (en) * | 2007-12-12 | 2009-06-17 | 三洋电机株式会社 | Battery pack |
| CN101567475A (en) * | 2008-04-22 | 2009-10-28 | 天津泛海科技有限公司 | Lithium battery/battery pack measuring and protecting method based on current subsection detecting technique |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112986835A (en) * | 2021-03-25 | 2021-06-18 | 东风汽车集团股份有限公司 | Analog front end monitoring circuit of power battery |
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Application publication date: 20181207 |
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