CN219179487U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN219179487U CN219179487U CN202223294711.3U CN202223294711U CN219179487U CN 219179487 U CN219179487 U CN 219179487U CN 202223294711 U CN202223294711 U CN 202223294711U CN 219179487 U CN219179487 U CN 219179487U
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- 238000001514 detection method Methods 0.000 title claims abstract description 77
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 56
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000003321 amplification Effects 0.000 description 8
- 238000003199 nucleic acid amplification method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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 present utility model provides a current detection circuit, comprising: the device comprises a shunt, a bidirectional current detection amplifying circuit, an analog-to-digital conversion circuit and a processor, wherein the shunt is connected with a battery to be tested in series; the bidirectional current detection amplifying circuit is connected with the shunt in parallel; the analog-to-digital conversion circuit is connected with the bidirectional current detection amplifying circuit; the processor is connected with the analog-to-digital conversion circuit. Compared with the prior Hall element for collecting current, the current collector for collecting current reduces the production cost of the current detection module, and is more beneficial to product popularization.
Description
Technical Field
The utility model relates to the field of current detection, in particular to a current detection circuit.
Background
With the background of the vast development of novel energy sources in China, a plurality of BMS systems at present are provided with current detection modules for sampling the change of current of the lithium battery during charging and discharging, so that the working state of the BMS controller is better monitored.
The traditional current detection module generally adopts a Hall element, however, the Hall element has higher price, so that the production cost of the current detection module is intangibly increased, and the product popularization is not facilitated.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the defect of high production cost caused by adopting a Hall element to produce a current detection module in the prior art, thereby providing a current detection circuit.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
an embodiment of the present utility model provides a current detection circuit, including: a current divider, a bidirectional current detection amplifying circuit, an analog-to-digital conversion circuit and a processor, wherein,
the current divider is connected with the battery to be tested in series;
the bidirectional current detection amplifying circuit is connected with the current divider in parallel, and is used for detecting voltage signals at two ends of the current divider, converting the voltage signals into analog current signals and amplifying the analog current signals;
the analog-to-digital conversion circuit is connected with the bidirectional current detection amplifying circuit and is used for receiving an analog current signal transmitted by the bidirectional current detection amplifying circuit and converting the analog current signal into a digital current signal;
the processor is connected with the analog-to-digital conversion circuit, and is used for receiving the digital current signal transmitted by the analog-to-digital conversion circuit, and calculating according to the digital signal to obtain the current value flowing through the battery to be tested.
Optionally, the shunt is a high precision resistor.
Optionally, the bidirectional current detection amplifying circuit includes: a bidirectional current detection amplifier, a signal acquisition circuit, a power supply circuit and an output circuit, wherein,
the input end of the signal acquisition circuit is connected with the shunt, and the output end of the signal acquisition circuit is connected with the input end of the bidirectional current detection amplifying circuit;
the input end of the power supply circuit is externally connected with a power supply, and the output end of the power supply circuit is connected with the power supply end of the bidirectional current detection amplifying circuit;
the input end of the output circuit is connected with the output end of the bidirectional current detection amplifying circuit, and the output end of the output circuit is connected with the input end of the analog-to-digital conversion circuit.
Optionally, the signal acquisition circuit includes: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, a first resistor and a second resistor, wherein,
the cathode of the first diode, one end of the third diode, one end of the fifth diode, one end of the first capacitor and one end of the third capacitor are all connected with the positive input end of the bidirectional current detection amplifier, and the anode of the first diode, the other end of the third diode, the other end of the fifth diode and the other end of the first capacitor are all grounded;
the cathode of the second diode, one end of the fourth diode, one end of the sixth diode, one end of the second capacitor and the other end of the third capacitor are all connected with the negative input end of the bidirectional current detection amplifier, and the anode of the second diode, the other end of the fourth diode, the other end of the sixth diode and the other end of the second capacitor are grounded;
the first resistor is connected in series between the positive input end of the signal acquisition circuit and the shunt;
the second resistor is connected in series between the negative input end of the signal acquisition circuit and the shunt.
Optionally, the first diode and the second diode are unidirectional TVS diodes, and the third diode, the fourth diode, the fifth diode and the sixth diode are bidirectional TVS diodes.
Optionally, the bidirectional current sense amplifier is MAX40056T.
Optionally, the analog-to-digital conversion circuit includes: the digital-analog/analog conversion chip is of the model SN74LVCI1G3157-Q.
The technical scheme of the utility model has the following advantages:
the present utility model provides a current detection circuit, comprising: the device comprises a shunt, a bidirectional current detection amplifying circuit, an analog-to-digital conversion circuit and a processor, wherein the shunt is connected with a battery to be tested in series; the bidirectional current detection amplifying circuit is connected with the shunt in parallel and is used for detecting voltage signals at two ends of the shunt, converting the voltage signals into analog current signals and amplifying the analog current signals; the analog-to-digital conversion circuit is connected with the bidirectional current detection amplifying circuit and is used for receiving the analog current signal transmitted by the bidirectional current detection amplifying circuit and converting the analog current signal into a digital current signal; the processor is connected with the analog-to-digital conversion circuit, and is used for receiving the digital current signal transmitted by the analog-to-digital conversion circuit, and calculating according to the digital signal to obtain the current value flowing through the tested battery. Compared with the prior Hall element for collecting current, the current collector for collecting current reduces the production cost of the current detection module, and is more beneficial to product popularization.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of one specific example of a current detection circuit in an embodiment of the utility model;
fig. 2 is a diagram of a bidirectional current detection amplifying circuit in an embodiment of the utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In order to reduce production cost, the embodiment of the utility model provides a current detection circuit. As shown in fig. 1, the current detection circuit includes: a shunt 1, a bidirectional current detection amplifying circuit 2, an analog-digital conversion circuit 3 and a processor 4.
In one embodiment, the current divider 1 is connected in series with the battery under test. The bidirectional current detection and amplification circuit 2 is connected with the shunt 1 in parallel, and the bidirectional current detection and amplification circuit 2 is used for detecting voltage signals at two ends of the shunt 1, converting the voltage signals into analog current signals and performing amplification processing. The analog-to-digital conversion circuit 3 is connected with the bidirectional current detection and amplification circuit 2, and the analog-to-digital conversion circuit 3 is used for receiving the analog current signal transmitted by the bidirectional current detection and amplification circuit 2 and converting the analog current signal into a digital current signal. The processor 4 is connected with the analog-digital conversion circuit 3, and the processor 4 is used for receiving the digital current signal transmitted by the analog-digital conversion circuit 3 and calculating according to the digital signal to obtain the current value flowing through the battery to be tested.
In the embodiment of the utility model, the current divider 1 is a high-precision resistor capable of passing current, when the current passes through the current divider 1, the current is amplified and detected by the bidirectional current detection amplifying circuit 2, then the current is subjected to analog-to-digital conversion by the analog-to-digital conversion circuit 3, and finally the current is calculated by the processor 4, so that the purpose of current collection is achieved.
The present utility model provides a current detection circuit, comprising: the device comprises a shunt, a bidirectional current detection amplifying circuit, an analog-to-digital conversion circuit and a processor, wherein the shunt is connected with a battery to be tested in series; the bidirectional current detection amplifying circuit is connected with the shunt in parallel and is used for detecting voltage signals at two ends of the shunt, converting the voltage signals into analog current signals and amplifying the analog current signals; the analog-to-digital conversion circuit is connected with the bidirectional current detection amplifying circuit and is used for receiving the analog current signal transmitted by the bidirectional current detection amplifying circuit and converting the analog current signal into a digital current signal; the processor is connected with the analog-to-digital conversion circuit, and is used for receiving the digital current signal transmitted by the analog-to-digital conversion circuit, and calculating according to the digital signal to obtain the current value flowing through the tested battery. Compared with the prior Hall element for collecting current, the current collector for collecting current reduces the production cost of the current detection module, and is more beneficial to product popularization.
In one embodiment, as shown in fig. 2, the bidirectional current detection amplifying circuit 2 includes: the bidirectional current detection amplifier 21, the signal acquisition circuit 22, the power supply circuit 23 and the output circuit 24, wherein the input end of the signal acquisition circuit 22 is connected with the shunt 1, and the output end of the signal acquisition circuit 22 is connected with the input end of the bidirectional current detection amplification circuit 2; the input end of the power supply circuit 23 is externally connected with a power supply, and the output end of the power supply circuit 23 is connected with the power supply end of the bidirectional current detection amplifying circuit 2; the input end of the output circuit 24 is connected with the output end of the bidirectional current detection amplifying circuit 2, and the output end of the output circuit 24 is connected with the input end of the analog-to-digital conversion circuit 3.
In one embodiment, bi-directional current sense amplifier 21 is model MAX40056T. The signal acquisition circuit 22 serves as a current acquisition part of the bidirectional current detection and amplification circuit 2, and plays roles of rectifying, filtering and protecting in the acquisition process, so as to provide a reliable current signal for the bidirectional current detection and amplification circuit 21. The power supply circuit 23 serves as a power supply portion of the bidirectional current detection amplifier circuit 2, and supplies a stable operating power source to the bidirectional current detection amplifier 21. The output circuit 24 further amplifies the current signal collected by the bidirectional current detection amplifying circuit 2, and finally transmits the processed analog current signal to the input end of the analog-to-digital conversion circuit 3.
In an embodiment of the present utility model, as shown in fig. 2, the signal acquisition circuit 22 includes: the first diode Z1, the second diode Z2, the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the first capacitor C1, the second capacitor C2, the third capacitor C3, the first resistor R1 and the second resistor R2.
The cathode of the first diode Z1, one end of the third diode D3, one end of the fifth diode D5, one end of the first capacitor C1, and one end of the third capacitor C3 are all connected to the positive input end of the bidirectional current detection amplifier 21, and the anode of the first diode Z1, the other end of the third diode D3, the other end of the fifth diode D5, and the other end of the first capacitor C1 are all grounded; the cathode of the second diode Z2, one end of the fourth diode D4, one end of the sixth diode D6, one end of the second capacitor C2 and the other end of the third capacitor C3 are all connected with the negative input end of the bidirectional current detection amplifier 21, and the anode of the second diode Z2, the other end of the fourth diode D4, the other end of the sixth diode D6 and the other end of the second capacitor C2 are grounded; the first resistor R1 is connected in series between the positive input end of the signal acquisition circuit 22 and the shunt 1; the second resistor R2 is connected in series between the negative input of the signal acquisition circuit 22 and the shunt 1.
Specifically, the first diode Z1 and the second diode Z2 are unidirectional TVS diodes, and the third diode D3, the fourth diode D4, the fifth diode D5, and the sixth diode D6 are bidirectional TVS diodes.
In one embodiment, the analog-to-digital conversion circuit 3 comprises: the digital-analog/analog conversion chip is of the model SN74LVCI1G3157-Q.
In one embodiment, the digital-to-analog/analog conversion chip converts the obtained output current value and then sends the converted output current value to the AFE or the processor 4 for calculation. In the embodiment of the present utility model, the processor 4 is also an existing chip, and the model thereof is not particularly limited herein.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications in form will be apparent to persons skilled in the art upon the description hereinabove. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (7)
1. A current detection circuit, comprising: a current divider, a bidirectional current detection amplifying circuit, an analog-to-digital conversion circuit and a processor, wherein,
the current divider is connected with the battery to be tested in series;
the bidirectional current detection amplifying circuit is connected with the current divider in parallel, and is used for detecting voltage signals at two ends of the current divider, converting the voltage signals into analog current signals and amplifying the analog current signals;
the analog-to-digital conversion circuit is connected with the bidirectional current detection amplifying circuit and is used for receiving an analog current signal transmitted by the bidirectional current detection amplifying circuit and converting the analog current signal into a digital current signal;
the processor is connected with the analog-to-digital conversion circuit, and is used for receiving the digital current signal transmitted by the analog-to-digital conversion circuit, and calculating according to the digital current signal to obtain a current value flowing through the battery to be tested.
2. The current detection circuit of claim 1, wherein the shunt is a high precision resistor.
3. The current detection circuit according to claim 1, wherein the bidirectional current detection amplifying circuit includes: a bidirectional current detection amplifier, a signal acquisition circuit, a power supply circuit and an output circuit, wherein,
the input end of the signal acquisition circuit is connected with the shunt, and the output end of the signal acquisition circuit is connected with the input end of the bidirectional current detection amplifying circuit;
the input end of the power supply circuit is externally connected with a power supply, and the output end of the power supply circuit is connected with the power supply end of the bidirectional current detection amplifying circuit;
the input end of the output circuit is connected with the output end of the bidirectional current detection amplifying circuit, and the output end of the output circuit is connected with the input end of the analog-to-digital conversion circuit.
4. A current detection circuit according to claim 3, wherein the signal acquisition circuit comprises: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, a first resistor and a second resistor, wherein,
the cathode of the first diode, one end of the third diode, one end of the fifth diode, one end of the first capacitor and one end of the third capacitor are all connected with the positive input end of the bidirectional current detection amplifier, and the anode of the first diode, the other end of the third diode, the other end of the fifth diode and the other end of the first capacitor are all grounded;
the cathode of the second diode, one end of the fourth diode, one end of the sixth diode, one end of the second capacitor and the other end of the third capacitor are all connected with the negative input end of the bidirectional current detection amplifier, and the anode of the second diode, the other end of the fourth diode, the other end of the sixth diode and the other end of the second capacitor are grounded;
the first resistor is connected in series between the positive input end of the signal acquisition circuit and the shunt;
the second resistor is connected in series between the negative input end of the signal acquisition circuit and the shunt.
5. The current detection circuit of claim 4, wherein the first diode and the second diode are unidirectional TVS diodes, and the third diode, the fourth diode, the fifth diode, and the sixth diode are bidirectional TVS diodes.
6. A current sensing circuit according to claim 3, wherein the bi-directional current sense amplifier is of the MAX40056T type.
7. The current detection circuit of claim 1, wherein the analog-to-digital conversion circuit comprises: the digital-analog/analog conversion chip is of the model SN74LVCI1G3157-Q.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223294711.3U CN219179487U (en) | 2022-12-08 | 2022-12-08 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223294711.3U CN219179487U (en) | 2022-12-08 | 2022-12-08 | Current detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219179487U true CN219179487U (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223294711.3U Active CN219179487U (en) | 2022-12-08 | 2022-12-08 | Current detection circuit |
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| CN (1) | CN219179487U (en) |
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- 2022-12-08 CN CN202223294711.3U patent/CN219179487U/en active Active
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Address after: 215129 West of Building 28, No. 2, Mount Taishan Road, Suzhou High tech Zone, Suzhou, Jiangsu Province Patentee after: Suzhou Jingkong Energy Technology Co.,Ltd. Address before: 215129 West, building 28, Hefeng Industrial Park, No.2, Taishan Road, high tech Zone, Suzhou City, Jiangsu Province Patentee before: SUZHOU JK ENERGY Ltd. |