CN203368109U - Detection circuit for lithium battery charger - Google Patents
Detection circuit for lithium battery charger Download PDFInfo
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- CN203368109U CN203368109U CN 201320503365 CN201320503365U CN203368109U CN 203368109 U CN203368109 U CN 203368109U CN 201320503365 CN201320503365 CN 201320503365 CN 201320503365 U CN201320503365 U CN 201320503365U CN 203368109 U CN203368109 U CN 203368109U
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- lithium battery
- resistance
- charging voltage
- lithium
- charging
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Abstract
The utility model relates to a detection circuit for a lithium battery charger. The detection circuit comprises a lithium battery protection chip, an MCU and a DC charging voltage generation module used for generating charging voltage, wherein a positive charging end and a negative charging end of the charging voltage generating module are used for being connected with a positive electrode and a negative electrode of a lithium battery pack respectively; the lithium battery protection chip comprises voltage detection terminals whose number is identical to that of lithium batteries in the lithium battery pack, and each of the voltage detection terminals is used for being connected with a positive electrode of a corresponding lithium battery in the lithium battery pack so as to detect the single lithium battery charging voltage of each lithium battery. The single lithium battery charging voltage is compared with preset single lithium battery over-charging voltage. When the single lithium battery charging voltage exceeds the single lithium battery over-charging voltage, the lithium battery protection chip outputs a single lithium battery over-charging signal to the MCU, and the MCU controls the DC charging voltage generation module to stop outputting the charging voltage. The detection circuit provided by the utility model can prevent any lithium battery from being over-charged, thereby enabling the service life of the lithium battery pack to be longer and the charging to be safer.
Description
Technical field
The utility model relates to a kind of lithium battery charger testing circuit.
Background technology
When existing charger is charged to the lithium battery group consisted of multisection lithium battery, it detects charging voltage and charging current in real time, damages lithium battery to prevent from overcharging.Yet, it can only be detected total charging voltage of lithium battery group, can not the sample voltage in single-lithium-battery pond, multisection lithium battery in the lithium battery group is because parameter error own can cause the charging voltage of multisection lithium battery different, so, even total the charging voltage of lithium battery group does not overcharge, but situation about overcharging may appear in the single-lithium-battery pond, whether overcharge and current charger detection circuit can't detect the single-lithium-battery pond, obviously buried potential safety hazard.
The utility model content
For the deficiencies in the prior art, the purpose of this utility model is intended to provide a kind of lithium battery charger testing circuit that detects the charging voltage in single-lithium-battery pond.
For achieving the above object, the utility model adopts following technical scheme:
A kind of lithium battery charger testing circuit, it comprises Li battery protection IC, MCU, for generation of the DC charging voltage generating module of charging voltage;
The He Fu charging end, positive charging end of this DC charging voltage generating module is respectively used to connect positive pole and the negative pole of lithium battery group;
Li battery protection IC comprises the voltage detecting end identical with lithium battery quantity in the lithium battery group, each voltage detecting end is for connecting the positive pole of a lithium battery corresponding to lithium battery group, to detect the single-lithium-battery pond charging voltage of each lithium battery, Li battery protection IC is for comparing single-lithium-battery pond charging voltage and default single-lithium-battery pond overcharged voltage, when single-lithium-battery pond charging voltage surpasses single-lithium-battery pond overcharged voltage, this Li battery protection IC is exported a single-lithium-battery pond and is overcharged signal to this MCU, this MCU controls this DC charging voltage generating module and stops exporting charging voltage.
Further, connect a resistance between the positive pole of each voltage detecting end of this Li battery protection IC and a corresponding lithium battery.
Further, connect an electric capacity between the positive pole of each lithium battery and negative pole.
Further, the DC charging voltage generating module comprises rectifier, transformer, diode, the first resistance and the first field effect; AC power is connected the anode of diode successively with transformer by rectifier, the negative electrode of diode connects the source electrode of the first field effect transistor, the drain electrode of the first field effect transistor connects positive charging end, the grid of the first field effect transistor connects the control end of MCU, one end of the first resistance connects negative charging end, the other end ground connection of the first resistance.
Further, the lithium battery charger testing circuit also comprises power supply IC, field effect transistor, the second resistance to the five resistance; The positive charging end of DC charging voltage generating module is by the second resistance and the 3rd grounding through resistance, the pressure feedback port of MCU is connected in the node between the second resistance and the 3rd resistance by the 5th resistance, the current feedback terminal of MCU connects negative charging end by the 4th resistance, the feedback signal output of MCU connects the feedback signal input of power supply IC, the control end of power supply IC connects the grid of the second field effect transistor, the source electrode of the second field effect transistor is by the 5th grounding through resistance, the primary side of the drain electrode connection transformer of the second field effect transistor.
The beneficial effects of the utility model are as follows:
Above-mentioned utility model can be avoided arbitrary joint over-charge of lithium battery, thereby makes the longer service life of lithium battery group, charges safer.
The accompanying drawing explanation
The circuit diagram of the better embodiment that Fig. 1 is the utility model lithium battery charger testing circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
Refer to Fig. 1; the utility model relates to a kind of lithium battery charger testing circuit, and its better embodiment comprises that Li battery protection IC U1, resistance R 1 are to resistance R 12, field effect transistor Q1, field effect transistor Q2, rectifier Z, transformer T, diode D1, power supply IC10 and MCU 20.
AC power AC is connected the anode of diode D1 by rectifier Z successively with transformer T, the negative electrode of diode D1 connects the source electrode of field effect transistor Q1, the drain electrode of field effect transistor Q1 connects positive charging end, the grid of field effect transistor Q1 connects the control end of MCU 20, one end of resistance R 11 connects negative charging end, the other end ground connection of resistance R 11, positive charging end is also by resistance R 7 and resistance R 8 ground connection, the pressure feedback port of MCU 20 is connected in the node between resistance R 7 and resistance R 8 by resistance R 10, the current feedback terminal of MCU 20 connects negative charging end by resistance R 9, the feedback signal output of MCU 20 connects the feedback signal input of power supply IC 10, the control end of power supply IC 10 connects the grid of field effect transistor Q2, the source electrode of field effect transistor Q2 is by resistance 12 ground connection, the primary side of the drain electrode connection transformer T of field effect transistor Q2.
Lithium battery B1 is composed in series a lithium battery group to lithium battery B5, and this lithium battery group is connected between He Fu charging end, positive charging end, to be charged.The positive power source terminal VDD of Li battery protection IC U1 connects positive feeder ear by resistance R 1; the first voltage detecting end VC1 to the five voltage detecting end VC5 of Li battery protection IC U1 connect respectively the positive pole of lithium battery B1 to lithium battery B5 by resistance R 2 to resistance R 6 respectively; capacitor C 1 to capacitor C 5 is connected to lithium battery B1 between the positive pole and negative pole of lithium battery B5; the negative power end VSS of this Li battery protection IC U1 connects negative feeder ear, and the signal output part of this Li battery protection IC U1 connects the feedback input end of MCU 20.
When charger is charged to the lithium battery group, whether this MCU 20 detects charging voltage and the charging current of lithium battery group in real time, to judge the lithium battery group, overcharge.Simultaneously; this Li battery protection IC U1 detects the single-lithium-battery pond charging voltage of lithium battery B1 to lithium battery B5 in real time; and single-lithium-battery pond charging voltage and default single-lithium-battery pond overcharged voltage are compared; when single-lithium-battery pond charging voltage surpasses single-lithium-battery pond overcharged voltage; this Li battery protection IC U1 export a single-lithium-battery pond overcharge signal as high level signal to this MCU 20; this MCU 20 overcharges signal controlling field effect transistor Q1 cut-off according to this single-lithium-battery pond, thereby stops charging to the lithium battery group.So, can avoid arbitrary joint over-charge of lithium battery, thereby make the longer service life of lithium battery group, charge safer.
In the present embodiment, this rectifier Z, transformer T, diode D1, resistance R 11 and field effect Q1 form a DC charging voltage generating module, for generation of charging voltage.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and the distortion all should belong to the protection range of the utility model claim within.
Claims (5)
1. a lithium battery charger testing circuit is characterized in that: it comprises Li battery protection IC, MCU, for generation of the DC charging voltage generating module of charging voltage;
The He Fu charging end, positive charging end of this DC charging voltage generating module is respectively used to connect positive pole and the negative pole of lithium battery group;
Li battery protection IC comprises the voltage detecting end identical with lithium battery quantity in the lithium battery group, each voltage detecting end is for connecting the positive pole of a lithium battery corresponding to lithium battery group, to detect the single-lithium-battery pond charging voltage of each lithium battery, Li battery protection IC is for comparing single-lithium-battery pond charging voltage and default single-lithium-battery pond overcharged voltage, when single-lithium-battery pond charging voltage surpasses single-lithium-battery pond overcharged voltage, this Li battery protection IC is exported a single-lithium-battery pond and is overcharged signal to this MCU, this MCU controls this DC charging voltage generating module and stops exporting charging voltage.
2. lithium battery charger testing circuit as claimed in claim 1 is characterized in that: between the positive pole of each voltage detecting end of this Li battery protection IC and a corresponding lithium battery, connect a resistance.
3. lithium battery charger testing circuit as claimed in claim 2, is characterized in that: connect an electric capacity between the positive pole of each lithium battery and negative pole.
4. lithium battery charger testing circuit as claimed any one in claims 1 to 3, it is characterized in that: the DC charging voltage generating module comprises rectifier, transformer, diode, the first resistance and the first field effect; AC power is connected the anode of diode successively with transformer by rectifier, the negative electrode of diode connects the source electrode of the first field effect transistor, the drain electrode of the first field effect transistor connects positive charging end, the grid of the first field effect transistor connects the control end of MCU, one end of the first resistance connects negative charging end, the other end ground connection of the first resistance.
5. lithium battery charger testing circuit as claimed in claim 4, it is characterized in that: the lithium battery charger testing circuit also comprises power supply IC, field effect transistor, the second resistance to the five resistance; The positive charging end of DC charging voltage generating module is by the second resistance and the 3rd grounding through resistance, the pressure feedback port of MCU is connected in the node between the second resistance and the 3rd resistance by the 5th resistance, the current feedback terminal of MCU connects negative charging end by the 4th resistance, the feedback signal output of MCU connects the feedback signal input of power supply IC, the control end of power supply IC connects the grid of the second field effect transistor, the source electrode of the second field effect transistor is by the 5th grounding through resistance, the primary side of the drain electrode connection transformer of the second field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320503365 CN203368109U (en) | 2013-08-16 | 2013-08-16 | Detection circuit for lithium battery charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320503365 CN203368109U (en) | 2013-08-16 | 2013-08-16 | Detection circuit for lithium battery charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203368109U true CN203368109U (en) | 2013-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320503365 Expired - Fee Related CN203368109U (en) | 2013-08-16 | 2013-08-16 | Detection circuit for lithium battery charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203368109U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208221A (en) * | 2016-08-10 | 2016-12-07 | 合肥国盛电池科技有限公司 | Lithium battery group protection mechanism |
-
2013
- 2013-08-16 CN CN 201320503365 patent/CN203368109U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208221A (en) * | 2016-08-10 | 2016-12-07 | 合肥国盛电池科技有限公司 | Lithium battery group protection mechanism |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160826 Address after: 425000 Industrial Road, Hexi Industrial Zone, Lingling Industrial Zone, Lingling District, Yongzhou, Hunan Patentee after: Hunan tech-power Technology Co., Ltd. Address before: 518100 Guangdong city of Shenzhen province Baoan District Fuyong street community baishixia Longwangmiao Industrial Zone sixteenth, nineteenth Patentee before: Songshun Electronic (Shenzhen) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20180816 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |