CN204967367U - Notebook computer battery protection circuit - Google Patents
Notebook computer battery protection circuit Download PDFInfo
- Publication number
- CN204967367U CN204967367U CN201520732918.5U CN201520732918U CN204967367U CN 204967367 U CN204967367 U CN 204967367U CN 201520732918 U CN201520732918 U CN 201520732918U CN 204967367 U CN204967367 U CN 204967367U
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- CN
- China
- Prior art keywords
- resistance
- pin
- notebook computer
- output
- electronic switch
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- Expired - Fee Related
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model provides a notebook computer battery protection circuit, it includes electronic switch K, current sampling resistance R, differential amplifier, voltage comparater and trigger, wherein electronic switch K is a controllable electronic switch that normally opens, it is established ties with current sampling resistance R mutually, the input of two way sampling circuit as differential amplifier is drawn forth at current sampling resistance R's both ends, voltage comparater's an input is connected to differential amplifier's output, another input of voltage comparater inserts one and sets for voltage, voltage comparater's output inserts the input of trigger, the output of trigger is connected electronic switch K and is controlled its on off state. Insert this circuit series connection between power adapter and the notebook computer, be in as notebook computer and shut down and during state that the battery is full of, can automatic disconnection power adapter to notebook computer's power supply, the protection battery by fills, effectively prolong the life of battery.
Description
Technical field
The utility model relates to a kind of protective circuit, and specifically a kind of cells in notebook computer protective circuit, belongs to electronic technology field.
Background technology
Battery is the important parts of notebook computer, and during user's short-period used notebook computer, general direct employing powered battery, when needs use notebook computer for a long time, user is generally that external power adapter is powered, simultaneously also for battery charges.Based on user habit, if notebook computer is placed on a place for a long time and uses, also power supply adaptor is not removed when user often shuts down, battery is made still to be in small area analysis floating charge state for a long time after filling, this can cause over-charging of battery, the capacity rapid decay of battery, the useful life of battery shortens greatly.Therefore we wish the circuit between power supply adaptor and notebook computer to increase a cells in notebook computer protective circuit.
Utility model content
The purpose of this utility model is to provide a kind of cells in notebook computer protective circuit, for the protection of cells in notebook computer.The technical thought of this circuit is: detect the power supply adaptor electric current of powering to notebook computer, when supply current is less than set point, shows that notebook computer is in shutdown and the state that is full of of battery, by the power supply of electronic switch deenergization adapter.
Concrete technical scheme of the present utility model is as follows:
A kind of cells in notebook computer protective circuit, it comprises electronic switch K, current sampling resistor R, differential amplifier, voltage comparator and trigger, wherein electronic switch K is one and controlled often drives electronic switch, itself and current sampling resistor R are in series, the input of two-way sample circuit as differential amplifier is drawn at the two ends of current sampling resistor R, the output of differential amplifier connects an input of voltage comparator, another input of voltage comparator accesses a setting voltage, the input of the output access trigger of voltage comparator, the output of trigger connects electronic switch K and controls its on off state.
By between this circuit connected in series access power supply adaptor and notebook computer during use, high level is exported by the output of reset switch control trigger, electronic switch K is closed, when notebook computer be in shutdown and battery be full of state time, the supply current flowing through current sampling resistor R becomes very little, the output of differential amplifier is made to be less than setting voltage numerical value, the output of voltage comparator overturns, then the output switching activity of trigger is made, control electronic switch K by trigger to disconnect, get final product deenergization adapter to the power supply of notebook computer, thus protection battery is not overcharged, the useful life of effective prolongation battery.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is physical circuit figure of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
As shown in Figure 1, this cells in notebook computer protective circuit comprises electronic switch K, current sampling resistor R, differential amplifier, voltage comparator and trigger, wherein electronic switch K is one and controlled often drives electronic switch, itself and current sampling resistor R are in series, the input of two-way sample circuit as differential amplifier is drawn at the two ends of current sampling resistor R, the output of differential amplifier connects an input of voltage comparator, another input of voltage comparator accesses a setting voltage, the input of the output access trigger of voltage comparator, the output of trigger connects electronic switch K and controls its on off state.
The specific implementation circuit diagram of this cells in notebook computer protective circuit as shown in Figure 2, described electronic switch K is made up of an a PNP triode Q2 and NPN triode Q1, current sampling resistor R is resistance R1, triode Q2 emitter connects power supply adaptor, one end of collector electrode connecting resistance R1, base stage connects the collector electrode of triode Q1, the grounded emitter of triode Q1, another termination notebook computer of resistance R1; Described differential amplifier and voltage comparator are built by operational amplifier U1 and U2 of LM358 chip respectively, trigger is built by 555 integrated circuit U3, the wherein high electronegative potential two ends of one end difference contact resistance R1 of resistance R2 and R4, the other end of resistance R2 and one end of resistance R3 access the positive input terminal of operational amplifier U1 jointly, the other end ground connection of resistance R3, the other end of resistance R4 and one end of resistance R5 access the negative input end of operational amplifier U1 jointly, the output of another termination operational amplifier U1 of resistance R5; The negative input end of the output termination operational amplifier U2 of operational amplifier U1, the adjustable side of the positive input termination adjustable resistor of operational amplifier U2, a termination+5V power supply of adjustable resistor, other end ground connection; 6 pin of the output termination integrated circuit U3 of operational amplifier U2,4 pin and 8 pin of integrated circuit U3 connect+5V power supply, 1 pin ground connection, between 2 pin that resistance R6 accesses integrated circuit U 3 and 4 pin, between 1 pin that reset switch K1 and electric capacity C1 parallel connection access integrated circuit U 3 afterwards and 2 pin, after the 3 pin series resistor R7 of integrated circuit U3, access the base stage of triode Q1.
By between circuit A, B end series connection access power supply adaptor and notebook computer during use, click reset switch K1,3 pin of integrated circuit U3 export high level, and triode Q1, Q2 conducting, power supply adaptor is powered to notebook computer.Comparatively large for electric current during normal power supply, operational amplifier U1 output voltage is greater than setting voltage, operational amplifier U2 output low level, and the 3 pin output levels of integrated circuit U3 remain unchanged.When notebook computer be in shutdown and battery be full of state time, supply current becomes very little, operational amplifier U1 output voltage is less than setting voltage, operational amplifier U2 exports high level, the 3 pin output switching activities of integrated circuit U3 become low level, triode Q1, Q2 end, and the supply line between power supply adaptor and notebook computer disconnects.
Claims (2)
1. a cells in notebook computer protective circuit, it is characterized in that: circuit comprises electronic switch K, current sampling resistor R, differential amplifier, voltage comparator and trigger, wherein electronic switch K is one and controlled often drives electronic switch, itself and current sampling resistor R are in series, the input of two-way sample circuit as differential amplifier is drawn at the two ends of current sampling resistor R, the output of differential amplifier connects an input of voltage comparator, another input of voltage comparator accesses a setting voltage, the input of the output access trigger of voltage comparator, the output of trigger connects electronic switch K and controls its on off state.
2. cells in notebook computer protective circuit according to claim 1, it is characterized in that: described electronic switch K is made up of an a PNP triode Q2 and NPN triode Q1, current sampling resistor R is resistance R1, triode Q2 emitter connects power supply adaptor, one end of collector electrode connecting resistance R1, base stage connects the collector electrode of triode Q1, the grounded emitter of triode Q1, another termination notebook computer of resistance R1; Described differential amplifier and voltage comparator are built by operational amplifier U1 and U2 of LM358 chip respectively, trigger is built by 555 integrated circuit U3, the wherein high electronegative potential two ends of one end difference contact resistance R1 of resistance R2 and R4, the other end of resistance R2 and one end of resistance R3 access the positive input terminal of operational amplifier U1 jointly, the other end ground connection of resistance R3, the other end of resistance R4 and one end of resistance R5 access the negative input end of operational amplifier U1 jointly, the output of another termination operational amplifier U1 of resistance R5; The negative input end of the output termination operational amplifier U2 of operational amplifier U1, the adjustable side of the positive input termination adjustable resistor of operational amplifier U2, a termination+5V power supply of adjustable resistor, other end ground connection; 6 pin of the output termination integrated circuit U3 of operational amplifier U2,4 pin and 8 pin of integrated circuit U3 connect+5V power supply, 1 pin ground connection, between 2 pin that resistance R6 accesses integrated circuit U 3 and 4 pin, between 1 pin that reset switch K1 and electric capacity C1 parallel connection access integrated circuit U 3 afterwards and 2 pin, after the 3 pin series resistor R7 of integrated circuit U3, access the base stage of triode Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520732918.5U CN204967367U (en) | 2015-09-22 | 2015-09-22 | Notebook computer battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520732918.5U CN204967367U (en) | 2015-09-22 | 2015-09-22 | Notebook computer battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204967367U true CN204967367U (en) | 2016-01-13 |
Family
ID=55062408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520732918.5U Expired - Fee Related CN204967367U (en) | 2015-09-22 | 2015-09-22 | Notebook computer battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204967367U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098931A (en) * | 2015-09-22 | 2015-11-25 | 广西职业技术学院 | Laptop battery protection circuit |
| CN107769318A (en) * | 2017-11-03 | 2018-03-06 | 深圳锐源微电子科技有限公司 | Charging circuit, device, intelligent terminal and charging method |
-
2015
- 2015-09-22 CN CN201520732918.5U patent/CN204967367U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098931A (en) * | 2015-09-22 | 2015-11-25 | 广西职业技术学院 | Laptop battery protection circuit |
| CN107769318A (en) * | 2017-11-03 | 2018-03-06 | 深圳锐源微电子科技有限公司 | Charging circuit, device, intelligent terminal and charging 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 |
Granted publication date: 20160113 Termination date: 20170922 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |