CN104459286A - Battery voltage acquisition system - Google Patents
Battery voltage acquisition system Download PDFInfo
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- CN104459286A CN104459286A CN201310433530.0A CN201310433530A CN104459286A CN 104459286 A CN104459286 A CN 104459286A CN 201310433530 A CN201310433530 A CN 201310433530A CN 104459286 A CN104459286 A CN 104459286A
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- voltage
- battery
- acquisition system
- optical coupler
- optocoupler
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- 230000008054 signal transmission Effects 0.000 claims abstract description 10
- 230000003287 optical effect Effects 0.000 claims description 32
- 238000010586 diagram Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
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Abstract
The invention discloses a battery voltage acquisition system. The battery voltage acquisition system comprises a battery pack, a gating unit, a first optocoupler, a signal transmission unit, a second optocoupler and a proportional circuit; the battery pack comprises a plurality of unit batteries connected in series; the gating unit is used for gating of the unit batteries to be detected; the first optocoupler is used for converting the voltage of the batteries to be detected into a current signal and outputting a corresponding first voltage signal; the signal transmission unit is used for transmitting the voltage signal to the second optocoupler; the second optocoupler is used for converting the first voltage signal into a second voltage signal; the proportional circuit is used for converting the voltage signal into a measureable voltage value. According to the battery voltage acquisition system, voltage acquisition of a battery management system can be safer and save more energy.
Description
Technical Field
The invention relates to a battery voltage acquisition system, in particular to a battery voltage acquisition system for an electric automobile, which can be electrically isolated.
Background
At present, the electric vehicle is widely applied to the life of people due to the advantages of energy conservation and environmental protection. With the development of lithium ion battery technology, lithium ion batteries are increasingly used in the field of electric vehicles. In the application of electric vehicles, tens or even hundreds of single batteries are required to be connected in series to achieve a required voltage. In order to ensure the normal operation of the battery pack, each single lithium ion battery needs to be managed and monitored safely in real time. The voltage of the single battery in the battery pack can not be directly acquired due to the existence of common-mode voltage at two ends of the battery, and other means are required for acquiring.
At present, the technical means frequently adopted is to connect the single batteries with a differential operational amplifier respectively, so that the voltages of the single batteries are collected independently, and the influence of common-mode voltage is eliminated.
However, the current battery voltage acquisition system still has the following problems:
1. and the safety is low because the electric isolation is not carried out.
2. When detecting voltage, the leakage current loss is large.
Disclosure of Invention
In view of the above, it is a primary object of the present invention to provide a method for performing.
In order to achieve the above object, the present invention provides a battery voltage acquisition system, comprising:
the battery pack comprises a plurality of single batteries connected in series;
the gating unit is used for gating the single battery to be detected;
the first optical coupler is used for converting the voltage of the battery to be detected into a current signal and outputting a corresponding first voltage signal;
the signal transmission unit is used for transmitting the voltage signal to a second optical coupler;
the second optical coupler is used for converting the transmitted first voltage signal into a second voltage signal;
a proportional circuit for converting the voltage signal to a measurable voltage value.
Wherein,
the signal transmission unit is a comparator;
the comparator is used for enabling a first voltage signal of the first optical coupler and a second voltage signal of the second optical coupler to form a feedback comparison circuit, and therefore the first voltage value and the second voltage value are controlled to be equal.
Wherein,
the proportional circuit is a voltage follower circuit.
The invention further provides a battery voltage acquisition system, comprising:
the battery pack comprises a plurality of single batteries connected in series;
the positive electrode of the single battery is connected to the positive electrode of the diode of the first optocoupler through a resistor;
the triode collector of the first optocoupler is connected with the negative input end of the comparator through a divider resistor;
the positive input end of the comparator is connected to the collector electrode of the triode of the second optocoupler;
the output end of the comparator is connected to the anode of the diode of the second optocoupler;
and the cathode of the diode of the second optical coupler is connected to the positive input end of the proportional operational amplifier through a resistor.
The battery voltage acquisition system adopts the linear optocoupler as a signal transmission sampling device of the isolation and data acquisition system, so that the voltage of each battery at the front end is isolated; and, the large voltage of the battery is scaled down by a certain ratio so as to faithfully reflect the varied voltage value of the battery to the controller.
Drawings
FIG. 1 is a schematic diagram of a battery voltage acquisition system according to the present invention;
FIG. 2 is a block diagram of a voltage acquisition circuit in the battery voltage acquisition system shown in FIG. 1;
FIG. 3 is a circuit block diagram of the voltage acquisition circuit shown in FIG. 2;
fig. 4 is a chip connection diagram of the voltage acquisition circuit shown in fig. 3.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and embodiments of the present invention.
Fig. 1 is a schematic diagram of a voltage acquisition system according to an embodiment of the invention.
As shown in fig. 1, the battery voltage collecting system of the present invention includes:
the gating unit is connected with the battery pack and used for gating the single battery to be detected through the controller;
the voltage acquisition unit is used for acquiring the voltage of the single battery to be tested gated by the gating unit;
and the controller is used for controlling the gating unit to act according to the voltage value output by the voltage acquisition unit.
The voltage acquisition circuit in the battery voltage acquisition system of the present invention will be described in detail with reference to fig. 2 and 3.
Fig. 2 is a block diagram illustrating a voltage acquisition unit according to the present invention, and fig. 3 is a detailed circuit configuration diagram of the voltage acquisition unit shown in fig. 2.
As shown in fig. 2, the voltage acquisition unit further includes a first optical coupler and isolation circuit, a signal transmission unit, a second optical coupler and isolation circuit, and a proportional circuit.
The first optical coupler isolation circuit comprises an optical coupler 102 shown in fig. 3, wherein the anode of a light emitting diode of the optical coupler is connected to the anode of a single battery through a resistor R1, and is connected with the cathode of the single battery through a gating circuit 101 to form a loop with the light emitting diode in the optical coupler;
thus, an input end light emitting diode in the optical coupler converts a voltage signal Vin of the single battery into a current signal I11, and a phototriode at an output end is conducted;
according to the principle of optical coupling, I11 should be in direct proportion to I12 under ideal conditions; however, under a normal working state, the current transmission characteristics of the optocoupler often cannot reach a direct proportional relation under an ideal state, so that the voltage acquisition circuit of the invention adopts the signal transmission unit 104 and the second optocoupler 103 to carry out accurate current transmission, thereby accurately acquiring and measuring the battery voltage;
as shown in fig. 3, the signal transmission unit 104 may be a comparator, a negative input end of which is connected to a point B of a voltage output end of the first optical coupler, and a positive input end of which is connected to a point a of a voltage output end of the second optical coupler, and is configured to transmit a current signal of the first optical coupler isolation circuit to the second optical coupler isolation circuit; the output of the comparator is connected to the anode of the light emitting diode of the second optocoupler 103; thus, the comparator forms a feedback circuit;
the input end point A and the input end point B are voltage division points for 15v respectively, when the voltage VA of the point A is larger than the voltage VB of the point B, the comparator outputs a higher voltage value, and when the voltage VA of the point A is lower than the voltage VB of the point B, the comparator outputs a lower voltage value; so that the voltage values of the two points A, B are consistent;
the cathode of the diode in the second optical coupler 103 is connected to a voltage output conversion resistor R2, so that the transmitted current signal is converted into a voltage signal;
and the proportion circuit 105 is used for converting the voltage signal output by the second optical coupler isolation circuit into a measurable voltage value through a certain proportion. The proportional circuit can be an operational amplifier, and a proportional operational circuit composed of R5 and R6, so that the required voltage proportion can be obtained.
The proportional circuit 105 may be a voltage follower circuit formed by an operational amplifier. It can be seen that according to the circuit design as above, when I21 is I12, I11 is I22; thus, (V)0-V1)/R1＝I11＝I22＝V()/R2Therefore, the voltage Vo is proportional to the input voltage, so that the voltage of the single battery can be collected and converted into a measurable voltage value Vo.
Fig. 4 is a specific chip diagram of the battery voltage acquisition system according to the present invention. The gating unit may adopt an optical coupler electronic device TLP512, the first optical coupler and the second optical coupler may adopt a dual optical coupler electronic device TLP512, and a dual operational amplifier electronic device LM358 may be used as a comparator and a proportional circuit. As can be seen from the figure, the cell voltage Vin (V0-V1) inputted is converted into the output voltage Vout for voltage detection.
According to the battery voltage acquisition system, signals at two ends of the optical coupler are completely isolated in electrical connection, and no relation exists, so that no influence is caused on the use of a battery even if the output end of the optical coupler is short-circuited. And the opto-coupler converts the voltage signal into a current signal for collection, thereby solving the common ground problem.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (5)
1. A battery voltage acquisition system comprising:
the battery pack comprises a plurality of single batteries connected in series;
the gating unit is used for gating the single battery to be detected;
the first optical coupler is used for converting the voltage of the battery to be detected into a current signal and outputting a corresponding first voltage signal;
the signal transmission unit is used for transmitting the voltage signal to a second optical coupler;
the second optical coupler is used for converting the transmitted first voltage signal into a second voltage signal;
a proportional circuit for converting the voltage signal to a measurable voltage value.
2. The battery voltage acquisition system of claim 1, wherein:
the signal transmission unit is a comparator;
the comparator is used for enabling a first voltage signal of the first optical coupler and a second voltage signal of the second optical coupler to form a feedback comparison circuit, and therefore the first voltage value and the second voltage value are controlled to be equal.
3. The battery voltage acquisition system of claim 1, wherein:
the proportional circuit is a voltage follower circuit.
4. The battery voltage acquisition system of claim 1, wherein:
the gating unit is an optocoupler diode.
5. A battery voltage acquisition system comprising:
the battery pack comprises a plurality of single batteries connected in series;
the positive electrode of the single battery is connected to the positive electrode of the diode of the first optocoupler through a resistor;
the triode collector of the first optocoupler is connected with the negative input end of the comparator through a divider resistor;
the positive input end of the comparator is connected to the collector electrode of the triode of the second optocoupler;
the output end of the comparator is connected to the anode of the diode of the second optocoupler;
and the cathode of the diode of the second optical coupler is connected to the positive input end of the proportional operational amplifier through a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310433530.0A CN104459286A (en) | 2013-09-22 | 2013-09-22 | Battery voltage acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310433530.0A CN104459286A (en) | 2013-09-22 | 2013-09-22 | Battery voltage acquisition system |
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| Publication Number | Publication Date |
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| CN104459286A true CN104459286A (en) | 2015-03-25 |
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| CN201310433530.0A Pending CN104459286A (en) | 2013-09-22 | 2013-09-22 | Battery voltage acquisition system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782957A (en) * | 2016-08-31 | 2018-03-09 | 北京智乐精仪科技有限公司 | Differential voltage detection method and battery voltage detector in the presence of common-mode voltage |
| CN112327196A (en) * | 2020-10-20 | 2021-02-05 | 西安工程大学 | Circuit and method for detecting voltage of single battery of series battery pack through linear optocoupler |
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| CN203519712U (en) * | 2013-09-22 | 2014-04-02 | 殷天明 | Battery voltage acquisition system |
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2013
- 2013-09-22 CN CN201310433530.0A patent/CN104459286A/en active Pending
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| CN1746695A (en) * | 2005-10-21 | 2006-03-15 | 清华大学 | Fuel cell monolithic voltage monitor of vehicle |
| US20090121721A1 (en) * | 2006-01-26 | 2009-05-14 | Johnson Controls Technology Company | Device for monitoring cell voltage |
| CN101324655A (en) * | 2008-07-04 | 2008-12-17 | 清华大学 | Low cost batteries monomer battery voltage measuring circuit |
| CN101413993A (en) * | 2008-12-09 | 2009-04-22 | 李鹏 | Apparatus for on-line conversing each battery voltage in battery pack |
| CN201903579U (en) * | 2010-12-08 | 2011-07-20 | 广东高新兴通信股份有限公司 | Measuring device for carrying out online measurement on voltage of 48 monomer batteries |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782957A (en) * | 2016-08-31 | 2018-03-09 | 北京智乐精仪科技有限公司 | Differential voltage detection method and battery voltage detector in the presence of common-mode voltage |
| CN112327196A (en) * | 2020-10-20 | 2021-02-05 | 西安工程大学 | Circuit and method for detecting voltage of single battery of series battery pack through linear optocoupler |
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Effective date of registration: 20160104 Address after: 551700 Guizhou Province, Bijie city seven cities in Northwest Guizhou Industrial Park A District Applicant after: Bijie Tian Yu power Science and Technology Co., Ltd. Address before: 100044 Beijing city Haidian District Xizhimen Yuen Electrical Engineering Building Room 208 No. 3 Applicant before: Yin Tianming Applicant before: Wang Yan |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |
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