CN220691069U - Battery voltage detection circuit - Google Patents
Battery voltage detection circuit Download PDFInfo
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- CN220691069U CN220691069U CN202320673650.7U CN202320673650U CN220691069U CN 220691069 U CN220691069 U CN 220691069U CN 202320673650 U CN202320673650 U CN 202320673650U CN 220691069 U CN220691069 U CN 220691069U
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- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model provides a battery voltage detection circuit, which specifically comprises: the device comprises a series battery pack, an electric signal acquisition unit AFE, a current limiting protection circuit, a controller MCU, a detection unit and an inductance circuit; each battery in the series battery pack is connected with the electric signal acquisition unit AFE in parallel; the electric signal acquisition unit AFE is connected with the current-limiting protection circuit; the current limiting protection circuit is connected with a first pole of the series battery pack; the controller MCU is connected with the inductance circuit; the inductance circuit is connected with a second pole of the series battery pack; the detection unit is respectively connected with the inductance circuit and the controller MCU. Q4 and D1 are added, so that current is cut off at T3 and cannot flow, and the multimeter cannot theoretically read voltage.
Description
Technical Field
The present disclosure relates to voltage detection circuits, and particularly to a battery voltage detection circuit.
Background
The prior art battery voltage detection circuit, as shown in FIG. 1, is turned off when Q1\Q2.
When the multimeter pen is clamped between P+P-, current flows from the internal sampling resistor of the P+P-multimeter to the internal sampling resistor of the P-R1-B-, so that voltage can be acquired on the multimeter. This voltage is essentially free of load carrying capability and is therefore called the virtual voltage. The virtual voltage measured on a 48V system is typically substantially above 24V. Resulting in inaccurate measurement voltages for the measurement circuit.
Disclosure of Invention
The present utility model has been made in view of the above-mentioned problems, and it is an object of the present utility model to provide a battery voltage detection circuit that overcomes or at least partially solves the above-mentioned problems.
According to an aspect of the present utility model, there is provided a battery voltage detection circuit, the detection circuit specifically comprising: the device comprises a series battery pack, an electric signal acquisition unit AFE, a current limiting protection circuit, a controller MCU, a detection unit and an inductance circuit;
each battery in the series battery pack is connected with the electric signal acquisition unit AFE in parallel;
the electric signal acquisition unit AFE is connected with the current-limiting protection circuit;
the current limiting protection circuit is connected with a first pole of the series battery pack;
the controller MCU is connected with the inductance circuit;
the inductance circuit is connected with a second pole of the series battery pack;
the detection unit is respectively connected with the inductance circuit and the controller MCU.
Optionally, the detecting unit specifically includes: the fourth MOS transistor Q4, the third triode T3 and the first inductor R1;
the grid electrode of the fourth MOS transistor Q4 is connected with the controller MCU, the source electrode is connected with the emitter electrode of the third triode T3, and the drain electrode is connected with the first electrode of the series battery pack;
the collector of the third triode T3 is connected with the negative electrode of the first diode D1, and the base is connected with one end of the first inductor R1;
the other end of the first inductor R1 is connected with the current-limiting protection circuit.
Optionally, the current limiting protection circuit specifically includes: the current divider, the first MOS transistor Q1, the second MOS transistor Q2, the second diode D2 and the third diode D3;
one end of the shunt is connected with the negative electrode of the series battery pack, and the other end of the shunt is connected with the source electrode of the first MOS tube Q1;
the grid electrode of the first MOS tube Q1 is connected with the electric signal acquisition unit AFE;
the drain electrode of the first MOS tube Q1 is connected with the source electrode of the second MOS tube Q2;
the grid electrode of the second MOS tube Q2 is connected with the electric signal acquisition unit AFE;
the drain electrode of the second MOS tube Q2 is connected with the other end of the first inductor;
the anode of the second diode D2 is connected with the source electrode of the first MOS tube Q1, and the cathode of the second diode D2 is connected with the drain electrode of the first MOS tube Q1;
the positive electrode of the third diode D3 is connected to the drain electrode of the second MOS transistor Q2, and the negative electrode is connected to the source electrode of the second MOS transistor Q2.
Optionally, the detection circuit further includes: and a load connected in parallel with the positive electrode of the series battery pack and the other end of the first inductor R1.
Optionally, the first pole of the series battery is a negative pole.
Optionally, the second pole of the series battery is a positive pole.
Optionally, the shunt is 0.2 milliohms.
Optionally, the inductance circuit specifically includes a first diode D1 and a second inductor R2, the controller MCU is connected with the positive electrode of the first diode D1 and one end of the second inductor R2, and the other end of the second inductor R2 is connected with the second electrode of the series battery pack.
Optionally, the controller MCU is M483KGCAE2A.
Optionally, a pin connected with the positive electrode of the first diode D1 and one end of the second inductor R2 by the controller MCU is an MCU interrupt input pin, and a pin connected with the controller MCU and the fourth MOS transistor Q4 is an MCU universal output pin.
The utility model provides a battery voltage detection circuit, which specifically comprises: the device comprises a series battery pack, an electric signal acquisition unit AFE, a current limiting protection circuit, a controller MCU, a detection unit and an inductance circuit; each battery in the series battery pack is connected with the electric signal acquisition unit AFE in parallel; the electric signal acquisition unit AFE is connected with the current-limiting protection circuit; the current limiting protection circuit is connected with a first pole of the series battery pack; the controller MCU is connected with the inductance circuit; the inductance circuit is connected with a second pole of the series battery pack; the detection unit is respectively connected with the inductance circuit and the controller MCU. The fourth MOS transistor Q4 and the first diode D1 are added, so that the current is cut off in the third triode T3 and cannot flow, and the multimeter cannot read the voltage theoretically.
The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of a prior art battery voltage detection circuit;
fig. 2 is a circuit diagram of battery voltage detection according to an embodiment of the present utility model.
Description of the embodiments
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terms "comprising" and "having" and any variations thereof in the description embodiments of the utility model and in the claims and drawings are intended to cover a non-exclusive inclusion, such as a series of steps or elements.
The technical scheme of the utility model is further described in detail below with reference to the accompanying drawings and the examples.
The battery voltage detection circuit specifically includes: the device comprises a series battery pack, an electric signal acquisition unit AFE, a current limiting protection circuit, a controller MCU, a detection unit, a first diode D1 and a second inductor R2;
each battery in the series battery pack is connected with the electric signal acquisition unit AFE in parallel;
the electric signal acquisition unit AFE is connected with the current-limiting protection circuit;
the current limiting protection circuit is connected with the negative electrode of the series battery pack;
the controller MCU is connected with the anode of the first diode D1 and one end of the second inductor R2; the controller MCU is M483KGCAE2A.
The other end of the second inductor R2 is connected with the positive electrode of the power supply;
the detection unit is respectively connected with the cathode of the first diode D1 and the controller MCU.
The detection unit specifically includes: the fourth MOS transistor Q4, the third triode T3 and the first inductor R1;
the grid electrode of the fourth MOS tube Q4 is connected with the controller MCU, the source electrode is connected with the emitter electrode of the third triode T3, and the drain electrode is connected with the negative electrode of the power supply;
the collector of the third triode T3 is connected with the cathode of the first diode D1, and the base is connected with one end of the first inductor R1;
the other end of the first inductor R1 is connected with a current-limiting protection circuit.
The current limiting protection circuit specifically comprises: the current divider, the first MOS transistor Q1, the second MOS transistor Q2, the second diode D2 and the third diode D3;
one end of the shunt is connected with the negative electrode of the series battery pack, and the other end of the shunt is connected with the source electrode of the first MOS tube Q1; the shunt was 0.2 milliohms.
The grid electrode of the first MOS tube Q1 is connected with the electric signal acquisition unit AFE;
the drain electrode of the first MOS tube Q1 is connected with the source electrode of the second MOS tube Q2;
the grid electrode of the second MOS tube Q2 is connected with the electric signal acquisition unit AFE;
the drain electrode of the second MOS tube Q2 is connected with the other end of the first inductor;
the anode of the second diode D2 is connected with the source electrode of the first MOS tube Q1, and the cathode is connected with the drain electrode of the first MOS tube Q1;
the anode of the third diode D3 is connected with the drain electrode of the second MOS tube Q2, and the cathode is connected with the source electrode of the second MOS tube Q2.
The pin that controller MCU with the anodal of first diode D1 with the one end of second inductance R2 is MCU interrupt input pin, the pin that controller MCU with fourth MOS pipe Q4 is the general output pin of MCU.
The detection circuit further includes: and a load connected in parallel with the positive electrode of the series battery and the other end of the first inductor R1.
The beneficial effects are that: the fourth MOS tube Q4 and the first diode D1 are added, so that the current is cut off in the third triode T3 and cannot flow, the voltage cannot be read in theory by the universal meter, and the accuracy of detecting the voltage is improved.
The foregoing detailed description of the utility model has been presented for purposes of illustration and description, and it should be understood that the utility model is not limited to the particular embodiments disclosed, but is intended to cover all modifications, equivalents, alternatives, and improvements within the spirit and principles of the utility model.
Claims (10)
1. A battery voltage detection circuit, the detection circuit comprising: the device comprises a series battery pack, an electric signal acquisition unit AFE, a current limiting protection circuit, a controller MCU, a detection unit and an inductance circuit;
each battery in the series battery pack is connected with the electric signal acquisition unit AFE in parallel;
the electric signal acquisition unit AFE is connected with the current-limiting protection circuit;
the current limiting protection circuit is connected with a first pole of the series battery pack;
the controller MCU is connected with the inductance circuit;
the inductance circuit is connected with a second pole of the series battery pack;
the detection unit is respectively connected with the inductance circuit and the controller MCU.
2. The battery voltage detection circuit according to claim 1, wherein the detection unit specifically comprises: the fourth MOS transistor Q4, the third triode T3 and the first inductor R1;
the grid electrode of the fourth MOS transistor Q4 is connected with the controller MCU, the source electrode is connected with the emitter electrode of the third triode T3, and the drain electrode is connected with the first electrode of the series battery pack;
the collector electrode of the third triode T3 is connected with the inductance circuit, and the base electrode of the third triode T3 is connected with one end of the first inductance R1;
the other end of the first inductor R1 is connected with the current-limiting protection circuit.
3. The battery voltage detection circuit of claim 2, wherein the current limiting protection circuit specifically comprises: the current divider, the first MOS transistor Q1, the second MOS transistor Q2, the second diode D2 and the third diode D3;
one end of the shunt is connected with the negative electrode of the series battery pack, and the other end of the shunt is connected with the source electrode of the first MOS tube Q1;
the grid electrode of the first MOS tube Q1 is connected with the electric signal acquisition unit AFE;
the drain electrode of the first MOS tube Q1 is connected with the source electrode of the second MOS tube Q2;
the grid electrode of the second MOS tube Q2 is connected with the electric signal acquisition unit AFE;
the drain electrode of the second MOS tube Q2 is connected with the other end of the first inductor;
the anode of the second diode D2 is connected with the source electrode of the first MOS tube Q1, and the cathode of the second diode D2 is connected with the drain electrode of the first MOS tube Q1;
the positive electrode of the third diode D3 is connected to the drain electrode of the second MOS transistor Q2, and the negative electrode is connected to the source electrode of the second MOS transistor Q2.
4. The battery voltage detection circuit of claim 2, wherein the detection circuit further comprises: and a load connected in parallel with the positive electrode of the series battery pack and the other end of the first inductor R1.
5. The battery voltage detection circuit of claim 1, wherein the first pole of the series-connected battery is a negative pole.
6. The battery voltage detection circuit of claim 1, wherein the second pole of the series battery is a positive pole.
7. A battery voltage detection circuit according to claim 3 wherein said current divider is 0.2 milliohms.
8. The battery voltage detection circuit according to claim 2, wherein the inductance circuit specifically comprises a first diode D1 and a second inductor R2, and the controller MCU is connected to the anode of the first diode D1 and one end of the second inductor R2;
the other end of the second inductor R2 is connected with a second pole of the series battery pack;
the detection unit is connected with the cathode of the first diode D1.
9. The battery voltage detection circuit of claim 1, wherein the controller MCU is M483KGCAE2A.
10. The battery voltage detection circuit according to claim 8, wherein a pin of the controller MCU connected to the positive electrode of the first diode D1 and one end of the second inductor R2 is an MCU interrupt input pin, and a pin of the controller MCU connected to the fourth MOS transistor Q4 is an MCU general output pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320673650.7U CN220691069U (en) | 2023-03-30 | 2023-03-30 | Battery voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320673650.7U CN220691069U (en) | 2023-03-30 | 2023-03-30 | Battery voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220691069U true CN220691069U (en) | 2024-03-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320673650.7U Active CN220691069U (en) | 2023-03-30 | 2023-03-30 | Battery voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220691069U (en) |
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2023
- 2023-03-30 CN CN202320673650.7U patent/CN220691069U/en active Active
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