CN220857660U - Low-power consumption high-consistency AFE chip power supply circuit - Google Patents
Low-power consumption high-consistency AFE chip power supply circuit Download PDFInfo
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- CN220857660U CN220857660U CN202322401028.3U CN202322401028U CN220857660U CN 220857660 U CN220857660 U CN 220857660U CN 202322401028 U CN202322401028 U CN 202322401028U CN 220857660 U CN220857660 U CN 220857660U
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- 238000002955 isolation Methods 0.000 claims abstract description 36
- 238000004891 communication Methods 0.000 claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 239000002253 acid Substances 0.000 claims description 20
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model relates to the technical field of electronic circuits, in particular to a low-power consumption high-consistency AFE chip power supply circuit, which comprises a voltage sampling loop formed by single battery cells, battery modules and AFE chips, wherein a plurality of single battery cells are connected in series in the battery modules, the battery modules are connected in equivalent series to form a module set, and the AFE chips are connected in equivalent series through daisy chain communication ends to form an AFE chip set; in the low-power-consumption high-consistency AFE chip power supply circuit, the DC-DC isolation power supply module is arranged on the AFE chip and the AFE chipset to form a secondary side power supply loop, and the DC-DC isolation power supply module provides a stable power supply for the AFE chip and the AFE chipset, so that the function of ensuring normal operation of the AFE chip is realized, and the effect that the service life of the battery pack is not influenced in the long-time operation process of the AFE chip is achieved in the battery pack.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a low-power-consumption high-consistency AFE chip power supply circuit.
Background
An important function in a lithium battery management system is battery cell voltage collection, and the number of battery cell voltage collection of a high-voltage battery pack is usually tens to hundreds of channels. Because the voltage acquisition of the battery cell unit has high precision requirement and high speed requirement, the conventional use of the battery cell unit is that a special analog front end chip, called AFE chip for short, is singly acquired, and the AFE chip maximally supports the voltage acquisition of the battery cell unit below twenty channels, a plurality of AFE chips are required to acquire the voltage of the battery cell unit in the whole battery pack, and the plurality of AFE chips are communicated by a daisy chain and finally transmitted to a main board.
The existing AFE chip power supply technology comprises that an AFE chip collects single-core voltage, the AFE chip needs battery module power supply of battery core integration, a plurality of modules are connected in series to a battery pack, a plurality of AFE chips are needed to collect, daisy chain communication is used between the AFE chips, the AFE chip and a main control are also communicated through the daisy chain, the AFE chip can realize the collection function after power supply is needed, the current power supply mode is to supply power from the battery module end, the plurality of AFE chips cannot be guaranteed to belong to the same internal digital circuit working mode in the whole system, and the battery pack service life is influenced due to inconsistent voltage among the modules under long-time running of the battery pack.
The power supply voltage range of the AFE chip is more than about ten volts to tens of volts, the battery pack works for a long time or the battery module voltage is low due to abnormality and cannot reach the normal work of the AFE chip, the AFE chip cannot communicate with a main board when the power supply of the AFE chip is insufficient, and the battery pack reports communication abnormal faults or the AFE chip loses faults; and the power supply voltage range of the AFE chip is more than about ten volts to tens of volts, and the battery cells in the battery module are required to be more than a certain number to ensure that the cell voltage of the AFE chip is in a normal working state of 2.5V-4.2V.
Therefore, the application provides a low-power-consumption high-consistency AFE chip power supply circuit, which belongs to a secondary side power supply loop, wherein the AFE chip power supply is from the voltage-stabilizing output power supply of a low-voltage side isolation power supply, the power supply source of each AFE is isolation DC-DC, and the electric quantity of a battery module is not required to be damaged, so that the module voltage is not consistent, the service life of a battery pack is prolonged, the output voltage of the circuit is of a voltage-stabilizing type, if the battery pack is abnormal, the battery module voltage is lower, the AFE chip still supplies power normally, the fault can be identified to belong to the abnormal voltage of the battery module, and the fault is not diagnosed as the loss of the AFE chip or communication fault by mistake.
Disclosure of utility model
The utility model aims to provide a low-power-consumption high-consistency AFE chip power supply circuit so as to solve the technical problems in the background art.
In order to achieve the above purpose, the utility model discloses a low-power consumption high-consistency AFE chip power supply circuit, which comprises a voltage sampling loop formed by single battery cells, a battery module and AFE chips, wherein a plurality of single battery cells are connected in series in the battery module, a plurality of battery modules are connected in equivalent series to form a module set, and a plurality of AFE chips are connected in equivalent series through a daisy chain communication end to form an AFE chip set;
The power supply circuit comprises an AFE chip, an AFE power supply positive terminal, an AFE power supply negative terminal, a DC-DC isolation power supply module and a main control chip, wherein the main control chip is fixedly connected with the DC-DC isolation power supply module, the AFE chip and the main control chip are connected through a daisy chain communication terminal, and the AFE chip is connected with the DC-DC isolation power supply module by setting the AFE power supply positive terminal and the AFE power supply negative terminal for power supply connection.
Further, a 12V/24V lead-acid positive input end and a 12V/24V lead-acid negative input end which are connected with a lead-acid battery are arranged in the DC-DC isolation power supply module.
Further, the DC-DC isolation power supply module is a power supply source of the AFE chip and the AFE chipset, has the characteristics of unidirectional output and bidirectional output, does not influence the work of the AFE chip and the AFE chipset when the working voltage of the battery module and the module set is low, and has the advantages of not misjudging that the AFE chip and the AFE chipset are abnormal and the communication of the daisy-chain communication end is abnormal.
Further, the position of the DC-DC isolation power supply module can be arranged in the main control chip, or in the same control board where the AFE chip and the AFE chipset are located, or independently used as a component to be arranged in the battery pack, so that when the power is supplied to the AFE chip and the AFE chipset, the service life of the battery pack is not influenced due to the fact that the inconsistent battery module and the module set are influenced due to the fact that the power consumption consistency of the AFE chip causes long-time work.
Further, the topology of the DC-DC isolated power module, including but not limited to any of flyback, forward, push-pull, half-bridge, and full-bridge, is used for portable connection and stable power supply with the AFE chip and the AFE chipset in a battery pack.
Further, the number of the single battery cells in the battery module collected by the AFE chip is not limited, and the AFE chip is flexibly applied to collecting different battery modules.
Further, the number of the AFE chips corresponds to the number of the battery modules one by one, and the same battery pack is realized by independently supplying power to the DC-DC isolation power supply module, so that the AFE chips and the battery modules are ensured to be in the same working mode of an internal digital circuit.
Further, the use steps of the DC-DC isolation power module are as follows:
A1, determining that the voltage requirement range of an input circuit is 6V-36V, and ensuring that the isolation safety of the input circuit and an output circuit is according to the safety isolation requirement of the battery pack voltage, referring to GB/T18384.3;
A2, selecting a proper DC-DC isolation power supply module or a switching power supply circuit, determining the input voltage range to be 6V-36V according to the requirement, wherein the output voltage range is the same as the power supply voltage range of the AFE chip to be 9-80V, and the output current is a parameter of 20 mA;
A3, connecting an input power supply to a 12V/24V lead-acid positive input end and a 12V/24V lead-acid negative input end of the lead-acid battery at the input end of the isolation power supply, and taking power from the output end of the isolation power supply to an AFE power supply positive end and an AFE power supply negative end by an output circuit;
A4, according to the requirement of the battery pack, a voltage stabilizing circuit or a filter circuit can be optionally added at the output end.
Compared with the prior art, the utility model has the following advantages:
1. In the low-power-consumption high-consistency AFE chip power supply circuit, a secondary side power supply loop is formed by arranging the DC-DC isolation power supply module on the AFE chip and the AFE chipset, and the DC-DC isolation power supply module provides a stable power supply for the AFE chip and the AFE chipset, so that the function of ensuring normal operation of the AFE chip is realized, the effect that the service life of the battery pack is not influenced in the long-time operation process of the AFE chip is achieved in the battery pack, and the effect of accurately collecting data is improved when the battery module and the module set are collected by the AFE chip and the V chipset.
Drawings
FIG. 1 is a schematic diagram of a low power consumption high consistency AFE chip power supply circuit structure of the present utility model.
The reference numerals are: 1. a single cell; 2. a battery module; 3. an AFE chip; 4. a module set; 5. an AFE chipset; 6. an AFE power supply positive terminal; 7. an AFE power supply negative electrode terminal; 8. a DC-DC isolated power module; 9. a daisy chain communication terminal; 10. a main control chip; 11. 12V/24V lead-acid positive electrode input end; 12. 12V/24V lead-acid negative electrode input end.
Detailed Description
The technical scheme of the utility model is explained in detail by specific examples.
Referring to fig. 1, the utility model discloses a low-power consumption high-consistency AFE chip power supply circuit structure, which comprises a voltage sampling loop formed by single battery cells 1, battery modules 2 and AFE chips 3, wherein a plurality of single battery cells 1 are connected in series in the battery modules 2, a plurality of battery modules 2 are connected in equivalent series to form a module set 4, and a plurality of AFE chips 3 are connected in equivalent series through a daisy chain communication end 9 to form an AFE chip set 5;
The power supply circuit comprises an AFE chip 3, an AFE power supply positive electrode terminal 6, an AFE power supply negative electrode terminal 7, a DC-DC isolation power supply module 8 and a main control chip 10, wherein the main control chip 10 is fixedly connected with the DC-DC isolation power supply module 8, the AFE chip 3 and the main control chip 10 are connected through a daisy chain communication terminal 9, and the AFE chip 3 and the DC-DC isolation power supply module 8 are connected by setting the AFE power supply positive electrode terminal 6 and the AFE power supply negative electrode terminal 7 for power supply connection.
In a preferred embodiment, the DC-DC isolated power module 8 is internally provided with a 12V/24V lead acid positive input 11 and a 12V/24V lead acid negative input 12 for connection to a lead acid battery.
In a preferred embodiment, the DC-DC isolated power module 8 is a power supply source of the AFE chip 3 and the AFE chipset 5, and the DC-DC isolated power module 8 has the characteristics of unidirectional output and bidirectional output, when the working voltages of the battery module 2 and the module set 4 are low, the working of the AFE chip 3 and the AFE chipset 5 is not affected, and the abnormal communication of the AFE chip 3 and the AFE chipset 5 and the communication abnormality of the daisy chain communication terminal 9 are not misjudged, so that active equalization of a circuit and redundant power supply of the main control chip are realized.
In a preferred embodiment, the DC-DC isolated power module 8 may be disposed in the main control chip 10, or disposed in the same control board where the AFE chip 3 and the AFE chipset 5 are disposed, or disposed in the battery pack as a separate component, so that when the AFE chip 3 and the AFE chipset 5 are powered, the battery pack life is not affected due to the inconsistent power consumption of the AFE chip, which affects the battery module 2 and the module set 4 due to the long-term operation.
In a preferred embodiment, the topology of the DC-DC isolated power module 8, including but not limited to any of flyback, forward, push-pull, half-bridge, and full-bridge, is used for portable connection and stable power supply with the AFE chip 3 and AFE chipset 5 in a battery pack.
In a preferred embodiment, the AFE chip 3 is not limited in the number of the single battery cells 1 in the battery module 2, and is flexibly applied to collecting different battery modules 2.
In a preferred embodiment, the number of the AFE chips 3 corresponds to the number of the battery modules 2 one by one, and the same battery pack is realized by independently supplying power to the DC-DC isolation power module 8, so that the AFE chips 3 and the battery modules 2 are ensured to be in the same working mode of an internal digital circuit, and the long-time operation of the battery pack is improved.
In a preferred embodiment, the DC-DC isolated power module 8 is used as follows:
The DC-DC isolated power module 8 is used as follows:
A1, determining that the voltage requirement range of an input circuit is 6V-36V, and ensuring that the input circuit and an output circuit are isolated according to the safety isolation requirement of the battery pack voltage, referring to GB/T18384.3, and preventing interference transmission of current and noise;
a2, selecting a proper DC-DC isolation power supply module or a switching power supply circuit, determining the input voltage range to be 6V-36V according to the requirement, wherein the output voltage range is the same as the power supply voltage range of the AFE chip 3 to be 9-80V, and the output current is a parameter of 20 mA;
A3, connecting an input power supply to a 12V/24V lead-acid positive input end 11 and a 12V/24V lead-acid negative input end 12 of an input end lead-acid battery of an isolation power supply, and taking power from an output end of the isolation power supply to an AFE power supply positive end 6 and an AFE power supply negative end 7 by an output circuit;
A4, according to the requirement of the battery pack, a voltage stabilizing circuit or a filter circuit can be optionally added at the output end.
Working principle: firstly, a lead-acid battery is utilized to adopt a 12V/24V lead-acid positive electrode input end 11 and a 12V/24V lead-acid negative electrode input end 12 to be input into a DC-DC isolation power supply module 8, and the DC-DC isolation power supply module 8 outputs an AFE power supply positive electrode end 6 and an AFE power supply negative electrode end 7 to supply power to an AFE chip 3 and an AFE chip set 5; then, after the power supply of the AFE chip 3 and the AFE chip set 5 is normal, the voltages of the single battery cells 1 are periodically collected by the ADC inside the AFE chip 3 and the AFE chip set 5 and are transmitted to the main control chip 10 through the daisy chain communication end 9; and finally, after the main control chip 10 is electrified, the AFE chip 3 and the AFE chip set 5 are configured through the communication of the daisy chain communication end 9, and the voltage of the single battery cell 1 acquired by the ADC is periodically transmitted to the main control chip 10 after the AFE chip 3 is successfully configured from the first AFE chip 3 to the final AFE chip 3.
The above embodiments are only preferred embodiments of the present utility model, and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present utility model should be included in the scope of the present utility model.
Claims (7)
1. The power supply circuit of the low-power consumption high-consistency AFE chip is characterized in that: the battery module comprises a voltage sampling loop formed by single battery cells (1), a battery module (2) and AFE chips (3), wherein a plurality of single battery cells (1) are connected in series in the battery module (2), a plurality of battery modules (2) are connected in equivalent series to form a module set (4), and a plurality of AFE chips (3) are connected in equivalent series through a daisy chain communication end (9) to form an AFE chip set (5);
The power supply circuit comprises an AFE chip (3), an AFE power supply positive terminal (6), an AFE power supply negative terminal (7), a DC-DC isolation power supply module (8) and a main control chip (10), wherein the main control chip (10) is fixedly connected with the DC-DC isolation power supply module (8), the AFE chip (3) is connected with the main control chip (10) through a daisy chain communication terminal (9), and the AFE chip (3) is connected with the DC-DC isolation power supply module (8) through the AFE power supply positive terminal (6) and the AFE power supply negative terminal (7).
2. The low power consumption high consistency AFE chip power supply circuit according to claim 1, characterized in that: the DC-DC isolation power module (8) is internally provided with a 12V/24V lead-acid positive electrode input end (11) and a 12V/24V lead-acid negative electrode input end (12) which are connected with a lead-acid battery.
3. The low power consumption high consistency AFE chip power supply circuit according to claim 2, characterized in that: the DC-DC isolation power supply module (8) is a power supply source of the AFE chip (3) and the AFE chipset (5), and the DC-DC isolation power supply module (8) has the characteristics of unidirectional output and bidirectional output.
4. The low power consumption high consistency AFE chip power supply circuit according to claim 2, characterized in that: the DC-DC isolation power supply module (8) can be arranged in the main control chip (10), or in the same control board where the AFE chip (3) and the AFE chip set (5) are arranged, or in the battery pack as a part.
5. The low power consumption high consistency AFE chip power supply circuit according to claim 2, characterized in that: the topology of the DC-DC isolated power module (8) includes, but is not limited to, any of flyback, forward, push-pull, half-bridge, and full-bridge.
6. The low power consumption high consistency AFE chip power supply circuit according to claim 2, characterized in that: the number of the single battery cells (1) in the battery module (2) collected by the AFE chip (3) is not limited.
7. The low power consumption high consistency AFE chip power supply circuit according to claim 2, characterized in that: the number of the AFE chips (3) corresponds to the number of the battery modules (2) one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322401028.3U CN220857660U (en) | 2023-09-05 | 2023-09-05 | Low-power consumption high-consistency AFE chip power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322401028.3U CN220857660U (en) | 2023-09-05 | 2023-09-05 | Low-power consumption high-consistency AFE chip power supply circuit |
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| CN220857660U true CN220857660U (en) | 2024-04-26 |
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| CN202322401028.3U Active CN220857660U (en) | 2023-09-05 | 2023-09-05 | Low-power consumption high-consistency AFE chip power supply circuit |
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| CN (1) | CN220857660U (en) |
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- 2023-09-05 CN CN202322401028.3U patent/CN220857660U/en active Active
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