CN203951173U - For lithium battery protection board overvoltage safe secondary protection circuit - Google Patents
For lithium battery protection board overvoltage safe secondary protection circuit Download PDFInfo
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- CN203951173U CN203951173U CN201420290983.2U CN201420290983U CN203951173U CN 203951173 U CN203951173 U CN 203951173U CN 201420290983 U CN201420290983 U CN 201420290983U CN 203951173 U CN203951173 U CN 203951173U
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- resistance
- electric capacity
- control chip
- overvoltage
- lithium battery
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Abstract
The utility model discloses a kind ofly for lithium battery protection board overvoltage safe secondary protection circuit, comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, control chip, power supply and field effect transistor.The utility model adopts control chip to coordinate three end Thermal Cutoffs to use for lithium battery protection board overvoltage safe secondary protection circuit; when the detection voltage detecting when control chip is more than or equal to 4.45V; OUT end output high level touches drain electrode and the source electrode conducting that makes field effect transistor; now three end Thermal Cutoffs fuse drop-down fusing by force; reach secondary overvoltage protection, avoid accident to occur.
Description
Technical field
The utility model relates to a kind of safe secondary protection circuit, relates in particular to a kind of for lithium battery protection board overvoltage safe secondary protection circuit.
Background technology
Generally, the design of intelligent power management lithium battery protection board is comprised of managing electric quantity chip and protection chip or chip, field effect transistor and peripheral capacitance resistance ware, fuse or PTC etc. that both are integrated; Wherein protect chip generally as first class of protection, to use, as over-charge protective, Cross prevention, overheat protector, overcurrent protection, short-circuit protection etc.; Fuse or PTC are used as second class protection; as overheat protector, overcurrent protection, short-circuit protection; main force's design in traditional lithium battery protection board does not all design overvoltage second-level protection function, makes it in the process of using, and may make because overvoltage protection lost efficacy the use of battery occur dangerous.
Utility model content
The purpose of this utility model provides a kind of for lithium battery protection board overvoltage safe secondary protection circuit with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of for lithium battery protection board overvoltage safe secondary protection circuit, comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, control chip, power supply and field effect transistor, the first end of described the first resistance is connected with the first end of described the second resistance and the positive pole of described power supply respectively, the second end of described the first resistance is connected with the first end of described the 4th electric capacity with the vdd terminal of described control chip respectively, the second end of described the 4th electric capacity respectively with the first end of described the 3rd electric capacity, the GND end of described control chip is connected with the first end of described the second electric capacity and ground connection, the second end of described the second electric capacity respectively with the first end of described the first electric capacity, described the 3rd first end of resistance and the VC4 of described control chip end are connected, the second end of described the first electric capacity respectively with the second end of described the second resistance, the VC1 end of described control chip, the VC2 end of described control chip and the VC3 end of described control chip are connected, the second end of described the 3rd resistance is connected with the negative pole of described power supply, the second end of described the 3rd electric capacity is connected with the CD of described control chip end, the OUT end of described control chip is connected with the first end of described the 4th resistance, the second end of described the 4th resistance is connected with described the 5th first end of electric capacity and the grid of described field effect transistor respectively, the second end of described the 5th electric capacity is connected with the first end of described the 5th resistance and ground connection, the second end of described the 5th resistance is connected with the source electrode of described field effect transistor, the drain electrode of described field effect transistor is connected with the guard terminal of fuse.
Particularly, the model of described control chip is BQ29412, and the overvoltage protection value of described control chip is 4.45V, and the model of described field effect transistor is AO3406, and described fuse is three end Thermal Cutoffs, and its model is D6X.
Particularly, the resistance value of described the first resistance is 1K Ω, and the resistance value of described the second resistance is 1K Ω, and the resistance value of described the 3rd resistance is 1K Ω, and the resistance value of described the 4th resistance is 220K Ω, and the resistance value of described the 5th resistance is 220K Ω.
Particularly, the capacitance of described the first electric capacity is 1uF, and the capacitance of described the second electric capacity is 1uF, and the electric capacity of described the 3rd electric capacity is 1uF most, and the capacitance of described the 4th electric capacity is 1uF, and the capacitance of described the 5th electric capacity is 1uF.
The beneficial effects of the utility model are:
The utility model adopts control chip to coordinate three end Thermal Cutoffs to use for lithium battery protection board overvoltage safe secondary protection circuit; when the detection voltage detecting when control chip is more than or equal to 4.45V; OUT end output high level touches drain electrode and the source electrode conducting that makes field effect transistor; now three end Thermal Cutoffs fuse drop-down fusing by force; reach secondary overvoltage protection, avoid accident to occur.
Accompanying drawing explanation
Fig. 1 is that the utility model is for the circuit diagram of lithium battery protection board overvoltage safe secondary protection circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the utility model is for lithium battery protection board overvoltage safe secondary protection circuit, comprise the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, control chip U, power supply E and field effect transistor M, the first end of the first resistance R 1 is connected with the positive pole of power supply E with the first end of the second resistance R 2 respectively, the second end of the first resistance R 1 is connected with the first end of the 4th capacitor C 4 with the vdd terminal of control chip U respectively, the second end of the 4th capacitor C 4 respectively with the first end of the 3rd capacitor C 3, the GND end of control chip U is connected with the first end of the second capacitor C 2 and ground connection, the second end of the second capacitor C 2 respectively with the first end of the first capacitor C 1, the VC4 end of the first end of the 3rd resistance R 3 and control chip U is connected, the second end of the first capacitor C 1 respectively with the second end of the second resistance R 2, the VC1 end of control chip U, the VC2 end of control chip U and the VC3 end of control chip U are connected, the second end of the 3rd resistance R 3 is connected with the negative pole of power supply E, the second end of the 3rd capacitor C 3 is connected with the CD of control chip U end, the OUT end of control chip U is connected with the first end of the 4th resistance R 4, the second end of the 4th resistance R 4 is connected with the grid of field effect transistor M with the first end of the 5th capacitor C 5 respectively, the second end of the 5th capacitor C 5 is connected with the first end of the 5th resistance R 5 and ground connection, the second end of the 5th resistance R 5 is connected with the source electrode of field effect transistor M, the drain electrode of field effect transistor M is connected with the guard terminal of fuse.
The model of control chip U is BQ29412, the model of field effect transistor M is AO3406, and the overvoltage protection value of control chip U is 4.45V, fuse is three end Thermal Cutoffs, and its model is D6X, the resistance value of the first resistance R 1 is 1K Ω, the resistance value of the second resistance R 2 is 1K Ω, the resistance value of the 3rd resistance R 3 is 1K Ω, the resistance value of the 4th resistance R 4 is 220K Ω, the resistance value of the 5th resistance R 5 is 220K Ω, the capacitance of the first capacitor C 1 is 1uF, the capacitance of the second capacitor C 2 is 1uF, the electric capacity of the 3rd capacitor C 3 is 1uF most, the capacitance of the 4th capacitor C 4 is 1uF, the capacitance of the 5th capacitor C 5 is 1uF.
The utility model is as follows for the operation principle of lithium battery protection board overvoltage safe secondary protection circuit:
The voltage detecting and controling circuit of this protective circuit is comprised of the first resistance R 1 to the 4th resistance R 4, the first capacitor C 1 to the 4th capacitor C 4 and control chip U, the second resistance R 2, the 3rd resistance R 3, the first capacitor C 1, the second capacitor C 2 and the 3rd capacitor C 3 are carried out filtering input for each unit corresponding to battery core provides a filter, the first resistance R 1 and 4 metering functions of the 4th resistance R, after the first capacitor C 1 setup times postpones, any battery core that activates output surpasses the time (being calculated as td=1.2V*DelayCap (uF)/0.18uA time of delay) of threshold voltage, the VC1 end of control chip U, VC2 end, the filter circuit that VC3 end and VC4 end consist of corresponding capacitance resistance ware respectively detects the voltage of corresponding battery core unit, and control chip U overvoltage protection value is 4.45V, if VC1 end in the situation that first class of protection lost efficacy, VC2 end, when VC3 holds corresponding GND end to detect voltage to be more than or equal to 8.90V or VC4 and to hold corresponding GND end to detect voltage to be more than or equal to 4.45V, OUT end output high level touches drain electrode and the source electrode conducting that makes field effect transistor M, now fuse drop-down fusing by force, reach secondary overvoltage protection, avoid accident to occur, when there is overvoltage, disposablely by force melt disconnected Thermal Cutoffs, avoid battery accident to occur.
The technical solution of the utility model is not limited to the restriction of above-mentioned specific embodiment, and every technology distortion of making according to the technical solution of the utility model, within all falling into protection range of the present utility model.
Claims (4)
1. one kind for lithium battery protection board overvoltage safe secondary protection circuit, it is characterized in that: comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, control chip, power supply and field effect transistor, the first end of described the first resistance is connected with the first end of described the second resistance and the positive pole of described power supply respectively, the second end of described the first resistance is connected with the first end of described the 4th electric capacity with the vdd terminal of described control chip respectively, the second end of described the 4th electric capacity respectively with the first end of described the 3rd electric capacity, the GND end of described control chip is connected with the first end of described the second electric capacity and ground connection, the second end of described the second electric capacity respectively with the first end of described the first electric capacity, described the 3rd first end of resistance and the VC4 of described control chip end are connected, the second end of described the first electric capacity respectively with the second end of described the second resistance, the VC1 end of described control chip, the VC2 end of described control chip and the VC3 end of described control chip are connected, the second end of described the 3rd resistance is connected with the negative pole of described power supply, the second end of described the 3rd electric capacity is connected with the CD of described control chip end, the OUT end of described control chip is connected with the first end of described the 4th resistance, the second end of described the 4th resistance is connected with described the 5th first end of electric capacity and the grid of described field effect transistor respectively, the second end of described the 5th electric capacity is connected with the first end of described the 5th resistance and ground connection, the second end of described the 5th resistance is connected with the source electrode of described field effect transistor, the drain electrode of described field effect transistor is connected with the guard terminal of fuse.
2. according to claim 1 for lithium battery protection board overvoltage safe secondary protection circuit; it is characterized in that: the model of described control chip is BQ29412; and the overvoltage protection value of described control chip is 4.45V; the model of described field effect transistor is AO3406; described fuse is three end Thermal Cutoffs, and its model is D6X.
According to claimed in claim 1 for lithium battery protection board overvoltage safe secondary protection circuit; it is characterized in that: the resistance value of described the first resistance is 1K Ω; the resistance value of described the second resistance is 1K Ω; the resistance value of described the 3rd resistance is 1K Ω; the resistance value of described the 4th resistance is 220K Ω, and the resistance value of described the 5th resistance is 220K Ω.
According to claimed in claim 1 for lithium battery protection board overvoltage safe secondary protection circuit; it is characterized in that: the capacitance of described the first electric capacity is 1uF; the capacitance of described the second electric capacity is 1uF; the electric capacity of described the 3rd electric capacity is 1uF most; the capacitance of described the 4th electric capacity is 1uF, and the capacitance of described the 5th electric capacity is 1uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420290983.2U CN203951173U (en) | 2014-06-03 | 2014-06-03 | For lithium battery protection board overvoltage safe secondary protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420290983.2U CN203951173U (en) | 2014-06-03 | 2014-06-03 | For lithium battery protection board overvoltage safe secondary protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203951173U true CN203951173U (en) | 2014-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420290983.2U Expired - Fee Related CN203951173U (en) | 2014-06-03 | 2014-06-03 | For lithium battery protection board overvoltage safe secondary protection circuit |
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| CN (1) | CN203951173U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487068A (en) * | 2016-11-28 | 2017-03-08 | 东莞新能德科技有限公司 | Overvoltage protective system and method |
-
2014
- 2014-06-03 CN CN201420290983.2U patent/CN203951173U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487068A (en) * | 2016-11-28 | 2017-03-08 | 东莞新能德科技有限公司 | Overvoltage protective system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141119 Termination date: 20170603 |