CN218727607U - Voltage sampling circuit for multiple single batteries - Google Patents
Voltage sampling circuit for multiple single batteries Download PDFInfo
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- CN218727607U CN218727607U CN202222129374.6U CN202222129374U CN218727607U CN 218727607 U CN218727607 U CN 218727607U CN 202222129374 U CN202222129374 U CN 202222129374U CN 218727607 U CN218727607 U CN 218727607U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The embodiment of the utility model provides a voltage sampling circuit for multisection monomer battery, this circuit includes proportion amplification module, adc, keeps apart chip, treater; the proportion amplification module is provided with the same number of single batteries as the multiple single batteries, the input ends of the proportion amplification module are connected with the corresponding single batteries, and the output ends of the proportion amplification module are connected with the analog-to-digital converter and used for collecting the voltages of the single batteries and amplifying the output voltages; the output end of the analog-to-digital converter is connected with the isolation chip and used for outputting a digital signal of a multiple value of voltage to the isolation chip after analog-to-digital conversion is carried out on the output voltage of the proportional amplification module; the output end of the isolation chip is connected with the processor and used for isolated communication between the analog-to-digital converter and the processor; and the input end of the processor is connected with the output end of the isolation chip and is used for processing the digital signal with the multiple value of the voltage.
Description
Technical Field
The utility model belongs to the technical field of voltage sampling, in particular to a voltage sampling circuit for multisection battery cell.
Background
In the new energy industry, batteries are widely applied, and generally, a battery pack is formed by connecting a plurality of single batteries in series, and the batteries are particularly sensitive to voltage due to the fact that the batteries belong to flammable and explosive articles; therefore, the voltage needs to be monitored in real time for each single battery; at present, a commonly used voltage sampling circuit generally adopts an operational amplifier sampling mode to collect the voltage of a single battery, however, due to the existence of common-mode voltage generated when a plurality of single batteries are connected in series, the precision of voltage signals of the single batteries collected by a plurality of channels can be influenced, and the voltage sampling result of the single battery is inaccurate.
Disclosure of Invention
Based on the problem, the utility model provides a voltage sampling circuit for multisection battery cell can eliminate the influence of common mode voltage to battery cell voltage sampling precision.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the embodiment of the utility model provides a voltage sampling circuit for multisection battery cell, this circuit includes proportion amplification module, adc, keeps apart chip, treater;
the proportion amplification module is provided with the same number of single batteries as the multiple single batteries, the input ends of the proportion amplification module are connected with the corresponding single batteries, and the output ends of the proportion amplification module are connected with the analog-to-digital converter and used for collecting the voltages of the single batteries and amplifying the output voltages;
the output end of the analog-to-digital converter is connected with the isolation chip and used for outputting a digital signal of a multiple value of voltage to the isolation chip after analog-to-digital conversion is carried out on the output voltage of the proportional amplification module;
the output end of the isolation chip is connected with the processor and used for isolated communication between the analog-to-digital converter and the processor;
and the input end of the processor is connected with the output end of the isolation chip and is used for processing the digital signal with the multiple value of the voltage.
In the above scheme, the proportional amplification module comprises a proportional resistor network and an isolation amplifier which are connected in sequence; the input and output ends of the proportional resistor network are respectively connected with the single battery and the isolation amplifier and used for acquiring the voltage of the single battery and adjusting the amplification factor of the isolation amplifier;
the output end of the isolation amplifier is connected with the analog-to-digital converter and used for obtaining the multiple value of the voltage of the single battery after the voltage sampling is carried out on the single battery.
In the above scheme, the proportional resistor network includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; the first end of the first resistor is connected with the output end of the first differential amplifier, and the second end of the first resistor is grounded through the second resistor; the second end of the first resistor is also connected with the cathode of the single battery through the fifth resistor and the inverting input end of the first differential amplifier; the positive electrode of the single battery is connected to the grounding terminal in series through the fourth resistor and the third resistor, and the grounding terminal is grounded; and one end of the fourth resistor, which is not connected with the positive electrode of the single battery, is also connected with the non-inverting input end of the first differential amplifier.
In the above solution, the isolation amplifier includes a first differential amplifier, a coupling transformer, a second differential amplifier, and a ground terminal; and the output signal of the first differential amplifier is coupled and output as the input signal of the second differential amplifier through the coupling transformer.
In the above solution, the first resistor, the fourth resistor, and the fifth resistor have the same resistance.
In the above scheme, the voltage sampling circuit further includes an isolation chip; the input end of the isolation chip is connected with the output end of the analog-to-digital converter, and the output end of the isolation chip is connected with the input end of the processor; the isolation chip is used for realizing isolated communication between the analog-to-digital converter and the processor
In the above scheme, the isolation chip is connected to the analog-to-digital converter through an SPI interface, and the isolation chip is connected to the processor through an SPI interface.
Compared with the prior art, the utility model discloses can realize the signal isolation and the power isolation between the multichannel sampling passageway to can eliminate the influence of the common mode voltage that multisection battery cell established ties the production to battery cell voltage sampling, guarantee the precision of battery cell voltage sampling.
Drawings
In order to more clearly illustrate the embodiments of the present application, reference will now be made briefly to the appended drawings, which are required to be used in embodiments, with the understanding that the drawings illustrate only some embodiments of the present application and are therefore not to be considered limiting of its scope, as those skilled in the art will appreciate that other related drawings may be obtained from the accompanying drawings without the exercise of inventive faculty.
FIG. 1 is a block diagram of a voltage sampling circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a circuit connection between a proportional resistor network and a first differential amplifier in an embodiment of the present application;
fig. 3 is a schematic diagram of a voltage sampling circuit for multiple single batteries according to an embodiment of the present application.
Reference numerals:
1 single battery, 2 proportional resistor networks, 3 isolation amplifiers, 4 analog-to-digital converters, 5 isolation chips, 6 processors, 7 first resistors, 8 second resistors, 9 third resistors, 10 fourth resistors, 11 fifth resistors and 12 first differential amplifiers.
Detailed Description
In order to clearly explain the technical features of the present invention, the present invention will be explained in detail by means of the following embodiments and with reference to the accompanying drawings.
The embodiment of the utility model provides a voltage sampling circuit for multisection monomer battery, as shown in fig. 1, this circuit includes scale amplification module, adc 4, keeps apart chip 5, treater 6;
the proportion amplification module is provided with the same number of single batteries 1 as the multiple single batteries 1, the input ends of the proportion amplification module are connected with the corresponding single batteries 1, and the output ends of the proportion amplification module are connected with the analog-to-digital converter 4 and used for collecting the voltage of the single batteries 1 and amplifying the output voltage;
the output end of the analog-to-digital converter 4 is connected with the isolation chip 5 and is used for performing analog-to-digital conversion on the output voltage of the proportional amplification module and outputting a digital signal of a multiple value of the voltage to the isolation chip 5;
the output end of the isolation chip 5 is connected with the processor and used for isolated communication between the analog-to-digital converter 4 and the processor 6;
the input end of the processor 6 is connected with the output end of the isolation chip 5 and is used for processing the digital signal of the multiple value of the voltage.
The proportional amplification module comprises a proportional resistor network 2 and an isolation amplifier 3 which are connected in sequence;
the input and output ends of the proportional resistor network 2 are respectively connected with the single battery 1 and the isolation amplifier 3 and are used for acquiring the voltage of the single battery 1 and adjusting the amplification factor of the isolation amplifier 3;
the output end of the isolation amplifier 3 is connected with the analog-to-digital converter and used for obtaining the voltage multiple value of the single battery 1 after voltage sampling is carried out on the single battery 1.
The proportional resistor network 2 and the isolation amplifier 3 form a plurality of groups of sampling channels, and each group of sampling channels respectively corresponds to each single battery 1 in the plurality of single batteries 1 one by one.
The proportional resistor network 2 is respectively connected with the single battery 1 and the isolation amplifier 3 and is used for collecting the voltage of the single battery 1 and adjusting the amplification factor of the isolation amplifier 3.
The isolation amplifier 3 samples the voltage of the single battery 1 through the proportional resistor network 2 to obtain a multiple value of the voltage of the single battery 1; the isolation amplifier 3 provides isolation of input and output signals and power isolation internally through transformer coupling.
The isolation amplifier 3 is internally coupled with a transformer to isolate input and output signals and a power supply, so that signal isolation and power supply isolation among multiple sampling channels are realized, the influence of common-mode voltage generated by the serial connection of multiple single batteries 1 on the voltage sampling of the single batteries 1 can be eliminated, and the voltage sampling precision of the single batteries 1 is ensured.
By arranging the isolation chip 5 between the analog-to-digital converter 4 and the processor 6 in the voltage signal acquisition circuit, the interference of external interference signals on the sampling signals of the circuit can be further reduced, and the voltage sampling precision of the circuit is further ensured.
In one embodiment, the isolation amplifier 3 includes a first differential amplifier 12, a coupling transformer, a second differential amplifier, and a ground terminal; the output signal of the first differential amplifier 12 is coupled out as the input signal of the second differential amplifier via the coupling transformer.
The isolation of the input and output signals of the isolation amplifier 3 is realized through a coupling transformer.
As shown in fig. 2, in one embodiment, the proportional resistor network 2 includes a first resistor 7, a second resistor 8, a third resistor 9, a fourth resistor 10, a fifth resistor 11; a first end of the first resistor 7 is connected with the output end of the first differential amplifier 12, and a second end of the first resistor 7 is grounded through the second resistor 8; the second end of the first resistor 7 is also connected with the cathode of the single battery 1 through a fifth resistor 11 and connected with the inverting input end of a first differential amplifier 12; the positive pole of the single battery 1 is connected in series to a grounding terminal through a fourth resistor 10 and a third resistor 9, and the grounding terminal is grounded; the end of the fourth resistor 10 not connected to the positive pole of the cell 1 is also connected to the non-inverting input of the first differential amplifier 12.
As shown in fig. 2, V1 is the voltage difference between two terminals of the single battery 1; v 1+ Is the voltage, V, of the positive pole of the single cell 1 to the system ground 1- The voltage of the negative pole of the single battery 1 to the system ground, vo 1 The first resistor 7 has a resistance value R for the output voltage of the first differential amplifier 12 1 The second resistor 8 has a resistance value R 2 The third resistor 9 has a resistance value R 3 The fourth resistor 10 has a resistance value of R 4 The resistance of the fifth resistor 11 is R 5 。
Then there are: v 1 ＝V 1+ -V 1- From the circuit knowledge, the following formula (1) can be obtained:
in one embodiment, the first resistor 7, the fourth resistor 10 and the fifth resistor 11 have the same resistance.
In one embodiment, the isolation chip 5 and the analog-to-digital converter 4 communicate via an SPI interface, and the isolation chip 5 and the processor 6 communicate via the SPI interface.
As shown in fig. 3, in an embodiment, the battery pack is formed by connecting 6 single batteries 1 in series, the voltage sampling circuit has 6 sampling channels, each sampling channel is formed by a proportional resistor network 2 and an isolation amplifier 3, each sampling channel is formed by R1 to R5, the isolation amplifier 3 is an AD210 chip, and the AD210 chip is internally isolated from input and output signals by coupling a transformer, so that the influence of common-mode voltage on voltage sampling of the single batteries 1 can be eliminated, and the voltage sampling precision of the single batteries 1 is ensured. The output of the 6-path isolation amplifier 3 is connected with 6 IO ports of the analog-to-digital converter 4, and the output of the analog-to-digital converter 4 is connected with the processor 6 through the isolation chip 5. The analog-to-digital converter 4 adopts a chip with the model number of AD7699, the isolation chip 5 adopts a chip with the model number of ISO7241C, and the processor 6 adopts an ARM chip with the model number of STM32F207ZET6.
When R1= R4= R5=380kohm, R2=21.1kohm, R3= 20kohm; from equation (1), we can obtain:
V 01 ＝V 1+ -V 1- ＝V 1 。
the output voltage of the isolation amplifier 3 is equal to the voltage of the input single battery 1, and the amplification factor of the isolation amplifier 3 is 1.
The embodiment of the utility model provides a voltage sampling circuit, through set up isolation amplifier in sampling circuit, isolation amplifier inside adopts the mode of transformer coupling to carry out input/output signal isolation and power isolation, realizes signal isolation and power isolation between the multichannel sampling passageway to can eliminate the influence of the common mode voltage that multisection battery cell established ties the production to the battery cell voltage sampling, guarantee the precision of battery cell voltage sampling.
The isolation chip is arranged between the analog-to-digital converter and the processor in the voltage signal acquisition circuit, so that the interference of external interference signals on the sampling signals of the circuit can be further reduced, and the voltage sampling precision of the circuit is further ensured.
The flexible amplification factor adjustment and the sampling work of the voltage of the single battery can be realized through the design of the proportional resistor network.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A voltage sampling circuit for a plurality of single batteries is characterized by comprising a proportional amplification module, an analog-to-digital converter, an isolation chip and a processor;
the proportion amplification module is provided with the same number of single batteries as the multiple single batteries, the input ends of the proportion amplification module are connected with the corresponding single batteries, and the output ends of the proportion amplification module are connected with the analog-to-digital converter and used for collecting the voltages of the single batteries and amplifying the output voltages;
the output end of the analog-to-digital converter is connected with the isolation chip and used for outputting a digital signal of a multiple value of voltage to the isolation chip after analog-to-digital conversion is carried out on the output voltage of the proportional amplification module;
the output end of the isolation chip is connected with the processor and used for isolated communication between the analog-to-digital converter and the processor;
and the input end of the processor is connected with the output end of the isolation chip and is used for processing the digital signal with the multiple value of the voltage.
2. The voltage sampling circuit for multiple single batteries according to claim 1, wherein the proportional amplifying module comprises a proportional resistor network and an isolation amplifier which are connected in sequence;
the input and output ends of the proportional resistor network are respectively connected with the single battery and the isolation amplifier and used for acquiring the voltage of the single battery and adjusting the amplification factor of the isolation amplifier;
the output end of the isolation amplifier is connected with the analog-to-digital converter and used for obtaining the multiple value of the voltage of the single battery after the voltage of the single battery is sampled.
3. The voltage sampling circuit for multiple single batteries according to claim 2, wherein the proportional resistor network comprises a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor; the first end of the first resistor is connected with the output end of the first differential amplifier, and the second end of the first resistor is grounded through the second resistor; the second end of the first resistor is also connected with the cathode of the single battery through the fifth resistor and the inverting input end of the first differential amplifier; the positive electrode of the single battery is connected in series with a grounding terminal through the fourth resistor and the third resistor, and the grounding terminal is grounded; and one end of the fourth resistor, which is not connected with the positive electrode of the single battery, is also connected with the non-inverting input end of the first differential amplifier.
4. The voltage sampling circuit for multiple single batteries according to claim 3, wherein said isolation amplifier comprises a first differential amplifier, a coupling transformer, a second differential amplifier and a ground terminal; and the output signal of the first differential amplifier is coupled and output as the input signal of the second differential amplifier through the coupling transformer.
5. The voltage sampling circuit for multiple single batteries according to claim 4, wherein the first resistor, the fourth resistor and the fifth resistor have the same resistance.
6. The voltage sampling circuit for multiple single batteries according to any one of claims 1-5, wherein the voltage sampling circuit further comprises an isolation chip; the input end of the isolation chip is connected with the output end of the analog-to-digital converter, and the output end of the isolation chip is connected with the input end of the processor; the isolation chip is used for realizing isolation communication between the analog-to-digital converter and the processor.
7. The voltage sampling circuit for multiple single batteries according to claim 6, wherein said isolation chip is connected to said analog-to-digital converter through an SPI interface, and said isolation chip is connected to said processor through an SPI interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222129374.6U CN218727607U (en) | 2022-08-12 | 2022-08-12 | Voltage sampling circuit for multiple single batteries |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222129374.6U CN218727607U (en) | 2022-08-12 | 2022-08-12 | Voltage sampling circuit for multiple single batteries |
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| Publication Number | Publication Date |
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| CN218727607U true CN218727607U (en) | 2023-03-24 |
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| CN202222129374.6U Active CN218727607U (en) | 2022-08-12 | 2022-08-12 | Voltage sampling circuit for multiple single batteries |
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- 2022-08-12 CN CN202222129374.6U patent/CN218727607U/en active Active
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