CN215525985U - Charger insertion detection circuit - Google Patents
Charger insertion detection circuit Download PDFInfo
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- CN215525985U CN215525985U CN202121399814.9U CN202121399814U CN215525985U CN 215525985 U CN215525985 U CN 215525985U CN 202121399814 U CN202121399814 U CN 202121399814U CN 215525985 U CN215525985 U CN 215525985U
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Abstract
The utility model discloses a charger insertion detection circuit which comprises a signal acquisition circuit, an amplification circuit and a current-to-voltage circuit, wherein the first input end of the amplification circuit is connected with the negative end of a battery and the first end of the current-to-voltage circuit, the second input end of the amplification circuit is connected with the negative end of the charger and the second end of the current-to-voltage circuit, and the output end of the amplification circuit is connected with the acquisition end of the signal acquisition circuit. The utility model can be directly integrated in a battery management system, is simple and practical, has good reliability and high stability, can be used for detecting whether unmatched abnormal charging behaviors exist when most chargers on the existing market are charged, and protects the stability of the battery to the greatest extent.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a charger insertion detection circuit for a lithium battery charging technology.
Background
For a long time, in the field of power batteries, because the technical content of the charger of the lithium battery is low and the production is easy, the market is full of inferior charger products with simple structure and low price, and some of the inferior charger products even have no basic insulation isolation of the incoming and outgoing lines. If these chargers are used in lithium batteries, the charging and discharging life of the storage batteries is slightly affected, and the personal safety of users may be directly threatened, so that it is necessary to draw attention.
Generally, a lithium Battery constitutes a power Battery PACK, and a Battery Management System (BMS) board integrated with a BMS is provided inside the PACK. When a power battery PACK formed by a lithium battery is charged by a charger which is not matched with the power battery PACK, abnormity often occurs, the service life of the battery is influenced, and a BMS board is damaged seriously.
SUMMERY OF THE UTILITY MODEL
The present invention provides a charger insertion detection circuit to solve the above technical problems.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides a charger inserts detection circuitry, includes signal acquisition circuit, amplifier circuit and electric current commentaries on classics voltage circuit, the negative terminal of battery and the first end of electric current commentaries on classics voltage circuit are connected to amplifier circuit's first input, and the negative terminal of charger and the second end of electric current commentaries on classics voltage circuit are connected to amplifier circuit's second input, and signal acquisition circuit's collection end is connected to amplifier circuit's output.
Preferably, the current-to-voltage circuit is formed by connecting at least two resistors in parallel.
Preferably, a current limiting circuit is connected between the first input terminal of the amplifying circuit and the negative terminal of the battery.
Preferably, the current limiting circuit is formed by connecting two or more fuses in parallel.
Preferably, the signal acquisition circuit comprises an acquisition chip, a diode D1 and a capacitor C1, the acquisition end of the acquisition chip is the acquisition end of the signal acquisition circuit, the anode of the diode D1 and one end of the capacitor C1 are grounded, and the cathode of the diode D1 and the other end of the capacitor C1 are connected with the acquisition end of the acquisition chip.
Preferably, the amplifying circuit comprises an amplifier U, a resistor R, a capacitor C, a diode D and a diode D, wherein a positive input end of the amplifier U is connected with one end of the resistor R, one end of the capacitor C, one end of the resistor R, a negative electrode of the diode D and one end of the capacitor C, a negative input end of the amplifier U is connected with one end of the resistor R, one end of the capacitor C, one end of the resistor R, a negative electrode of the diode D and the other end of the capacitor C, a negative voltage end of the amplifier U and one end of the capacitor C are connected with a power supply end, a positive voltage end of the amplifier U, the other end of the capacitor C, the other end of the resistor R, a positive electrode of the diode D, the other end of the capacitor C and a positive electrode of the diode D are all grounded, and an output end of the amplifier U is connected with one end of the resistor R, a negative voltage end of the capacitor C, a negative voltage end of the amplifier U, a negative voltage of the capacitor C, a capacitor D, a capacitor C, a capacitor, The other end of the resistor R2 and the other end of the resistor R1 are connected with the acquisition end of the signal acquisition circuit, the other end of the resistor R4 is a first input end, and the other end of the resistor R5 is a second input end.
Preferably, the output voltage of the power supply terminal is 3.3V.
Preferably, the chip acquisition circuit is connected with an alarm circuit, and the alarm circuit is electrically connected with the acquisition chip.
Compared with the prior art, the utility model can be directly integrated in a Battery Management System (BMS), is simple and practical, has good reliability and high stability, can be used for detecting whether unmatched abnormal charging behaviors exist when most chargers on the existing market are charged, and protects the stability of the battery to the greater extent.
Drawings
Fig. 1 is a schematic circuit diagram of a charger insertion detection circuit according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
As shown in fig. 1, a charger insertion detection circuit includes a signal acquisition circuit, an amplification circuit and a current-to-voltage circuit, wherein a first input terminal of the amplification circuit is connected to a negative terminal of a battery and a first terminal of the current-to-voltage circuit, a second input terminal of the amplification circuit is connected to the negative terminal of the charger and a second terminal of the current-to-voltage circuit, and an output terminal of the amplification circuit is connected to the acquisition terminal of the signal acquisition circuit.
The two ends of the current-voltage conversion circuit are respectively connected with the negative end P-of the charger and the negative end B-of the battery, and the current-voltage conversion circuit is used for converting the current of the detection loop into voltage and can be formed by connecting at least two resistors in parallel, wherein in the figure 1, the resistor R6 and the resistor R7 are formed by connecting the resistors in parallel.
And a current limiting circuit is connected between the first input end of the amplifying circuit and the negative end B-of the battery to limit the current of the loop and prevent the battery from being damaged when the output voltage of the charger is too high. Further, the current limiting circuit may be formed by connecting two or more fuses in parallel, such as the fuses F1 through F3 shown in fig. 1.
The signal acquisition circuit is used for acquiring an amplification signal of the amplification circuit to an acquisition chip for processing, and comprises the acquisition chip, a diode D1 and a capacitor C1, wherein the acquisition end SV of the acquisition chip is the acquisition end of the signal acquisition circuit, the anode of the diode D1 and one end of the capacitor C1 are grounded, and the cathode of the diode D1 and the other end of the capacitor C1 are connected with the acquisition end SV of the acquisition chip.
The amplifying circuit comprises an amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a diode D2 and a diode D3, wherein a positive input end of the amplifier U1 is connected with one end of the resistor R4, one end of the capacitor C3, one end of the resistor R3, a negative electrode of the diode D2 and one end of the capacitor C4, a negative input end of the amplifier U1 is connected with one end of the resistor R5, one end of the capacitor C5, one end of the resistor R2, a negative electrode of the diode D3 and the other end of the capacitor C4, a negative voltage end of the amplifier U1 and one end of the capacitor C2 are connected with a power supply terminal, a positive voltage end of the amplifier U1, the other end of the capacitor C3, the other end of the resistor R3, a positive electrode of the diode D3, the other end of the resistor R3 and the output end of the amplifier U3 are connected with the ground, the other end of the resistor R1 is connected with the acquisition end of the signal acquisition circuit, the other end of the resistor R4 is a first input end, and the other end of the resistor R5 is a second input end. The output voltage of the power supply terminal can adopt 3.3V voltage commonly used for chip power supply, the amplifier U1 can adopt OPA330, and the resistances of the resistor R2, the resistor R3, the resistor R4 and the resistor R5 can be adjusted to adjust the amplification factor of the amplifier U1.
When the charger charges the battery, the charger outputs a voltage, at which the battery voltage VccOutput voltage V of charger1Collecting voltage V at two ends of current-to-voltage circuit2The following relationships are provided: v2=V1-Vcc. At the moment, the voltages at the two ends of the current-voltage conversion circuit are collected and amplified by the amplifying circuit and are transmitted to the collecting chip, and whether the chargers are matched or not is analyzed. The acquisition chip can be internally provided with corresponding charging voltage standards of a plurality of battery packs, and the acquisition voltage V2 is compared with the standards to obtain a matching result.
The chip acquisition circuit is connected with an alarm circuit, and the alarm circuit is electrically connected with the acquisition chip. When the charger is not matched, an alarm signal can be sent out to remind a user to replace the matched charger for charging.
The utility model can be directly integrated in a Battery Management System (BMS), is simple and practical, has good reliability and high stability, can be used for detecting whether unmatched abnormal charging behaviors exist when most chargers on the existing market are charged, and protects the stability of the battery to the greater extent; when the BMS board has the charger to detect the function, only can allow to charge when detecting charger and battery package and matching, just report to the police in real time and cut off the charging circuit when not matching, prevent to charge by force, avoid the damage of battery package and BMS board.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.
It will be understood that the utility model is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.
Claims (8)
1. The utility model provides a charger inserts detection circuitry, its characterized in that includes signal acquisition circuit, amplifier circuit and electric current commentaries on classics voltage circuit, the negative terminal of battery and the first end of electric current commentaries on classics voltage circuit are connected to amplifier circuit's first input, and the negative terminal of charger and the second end of electric current commentaries on classics voltage circuit are connected to amplifier circuit's second input, and signal acquisition circuit's collection end is connected to amplifier circuit's output.
2. The charger insertion detection circuit of claim 1, wherein the current to voltage circuit is formed by at least two resistors connected in parallel.
3. The charger insertion detection circuit of claim 1, wherein a current limiting circuit is connected between the first input of the amplification circuit and the negative terminal of the battery.
4. The charger insertion detection circuit of claim 3, wherein the current limiting circuit is formed by two or more fuses connected in parallel.
5. The charger insertion detection circuit according to claim 1, wherein the signal acquisition circuit comprises an acquisition chip, a diode D1 and a capacitor C1, the acquisition end of the acquisition chip is the acquisition end of the signal acquisition circuit, the anode of the diode D1 and one end of the capacitor C1 are grounded, and the cathode of the diode D1 and the other end of the capacitor C1 are connected with the acquisition end of the acquisition chip.
6. The charger insertion detection circuit according to any one of claims 1 to 5, wherein the amplifying circuit comprises an amplifier U1, a resistor R1, a resistor R2, a resistor R3, a capacitor C3, a diode D3, and a diode D3, wherein a positive input terminal of the amplifier U3 is connected to one terminal of the resistor R3, one terminal of the capacitor C3, one terminal of the resistor R3, a negative terminal of the capacitor R3, a negative terminal of the diode D3, one terminal of the capacitor C3, a negative input terminal of the amplifier U3 is connected to one terminal of the resistor R3, one terminal of the capacitor C3, one terminal of the resistor R3, a negative terminal of the diode D3, the other terminal of the amplifier U3, one terminal of the capacitor C3, and a positive voltage terminal of the amplifier U3, the other terminal of the capacitor C3, the negative voltage, The anodes of the diodes D3 are all grounded, the output end of the amplifier U1 is connected with one end of the resistor R1 and the other end of the resistor R2, the other end of the resistor R1 is connected with the acquisition end of the signal acquisition circuit, the other end of the resistor R4 is a first input end, and the other end of the resistor R5 is a second input end.
7. The charger insertion detection circuit of claim 6, wherein the output voltage of the power supply terminal is 3.3V.
8. The charger insertion detection circuit of claim 5, wherein the chip acquisition circuit is connected to an alarm circuit, the alarm circuit being electrically connected to the acquisition chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121399814.9U CN215525985U (en) | 2021-06-23 | 2021-06-23 | Charger insertion detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121399814.9U CN215525985U (en) | 2021-06-23 | 2021-06-23 | Charger insertion detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215525985U true CN215525985U (en) | 2022-01-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121399814.9U Active CN215525985U (en) | 2021-06-23 | 2021-06-23 | Charger insertion detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215525985U (en) |
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2021
- 2021-06-23 CN CN202121399814.9U patent/CN215525985U/en active Active
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