CN105098931A - Laptop battery protection circuit - Google Patents
Laptop battery protection circuit Download PDFInfo
- Publication number
- CN105098931A CN105098931A CN201510603523.XA CN201510603523A CN105098931A CN 105098931 A CN105098931 A CN 105098931A CN 201510603523 A CN201510603523 A CN 201510603523A CN 105098931 A CN105098931 A CN 105098931A
- Authority
- CN
- China
- Prior art keywords
- resistance
- pin
- electronic switch
- operational amplifier
- voltage comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Power Sources (AREA)
Abstract
The invention provides a laptop battery protection circuit. The laptop battery protection circuit comprises an electronic switch K, a current sampling resistor R, a differential amplifier, a voltage comparator and a trigger, wherein the electronic switch K is a controlled normally-opened electronic switch and is connected in series with the current sampling resistor R, two paths of sampling circuits are led out from the two end of the current sampling resistor R and serve as the input ends of the differential amplifier, the output end of the differential amplifier is connected with an input end of the voltage comparator, a set voltage is accessed to the other input end of the voltage comparator, the output end of the voltage comparator is connected with the input end of the trigger, and the output end of the trigger is connected with the electronic switch K and used for controlling the switching state of the electronic switch K. When the circuit is connected in series between a power adapter and a laptop, the laptop is shut off and a battery is fully charged, the power supplied to the laptop from the power adaptor can be automatically cut off, the battery is protected from being over-charged, and thus, the service life of the battery is effectively prolonged.
Description
Technical field
The present invention relates to a kind of protective circuit, 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.
Summary of the invention
The object of this invention 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 invention 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 invention.
Fig. 2 is physical circuit figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
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 |
|---|---|---|---|
| CN201510603523.XA CN105098931A (en) | 2015-09-22 | 2015-09-22 | Laptop battery protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510603523.XA CN105098931A (en) | 2015-09-22 | 2015-09-22 | Laptop battery protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105098931A true CN105098931A (en) | 2015-11-25 |
Family
ID=54578768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510603523.XA Pending CN105098931A (en) | 2015-09-22 | 2015-09-22 | Laptop battery protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105098931A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055248A (en) * | 1990-03-31 | 1991-10-09 | 大连发电总厂 | A kind of servo amplifier |
| CN101963835A (en) * | 2009-07-24 | 2011-02-02 | 鸿富锦精密工业（深圳）有限公司 | Electronic equipment and method for dynamically allocating USB port power |
| US20110279094A1 (en) * | 2010-05-14 | 2011-11-17 | Toshiyuki Nakatsuji | Full charge capacity correction circuit, charging system, battery pack and full charge capacity correction method |
| CN102668319A (en) * | 2009-11-20 | 2012-09-12 | 飞思卡尔半导体公司 | Systems and methods for delivering power in response to a connection event |
| CN103238263A (en) * | 2010-12-01 | 2013-08-07 | 德克萨斯仪器股份有限公司 | Hybrid power battery charger control apparatus and method |
| CN104535219A (en) * | 2014-12-22 | 2015-04-22 | 深圳市朗特电子有限公司 | Liquid temperature detection system and liquid temperature detection method |
| CN204967367U (en) * | 2015-09-22 | 2016-01-13 | 广西职业技术学院 | Notebook computer battery protection circuit |
-
2015
- 2015-09-22 CN CN201510603523.XA patent/CN105098931A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055248A (en) * | 1990-03-31 | 1991-10-09 | 大连发电总厂 | A kind of servo amplifier |
| CN101963835A (en) * | 2009-07-24 | 2011-02-02 | 鸿富锦精密工业（深圳）有限公司 | Electronic equipment and method for dynamically allocating USB port power |
| CN102668319A (en) * | 2009-11-20 | 2012-09-12 | 飞思卡尔半导体公司 | Systems and methods for delivering power in response to a connection event |
| US20110279094A1 (en) * | 2010-05-14 | 2011-11-17 | Toshiyuki Nakatsuji | Full charge capacity correction circuit, charging system, battery pack and full charge capacity correction method |
| CN103238263A (en) * | 2010-12-01 | 2013-08-07 | 德克萨斯仪器股份有限公司 | Hybrid power battery charger control apparatus and method |
| CN104535219A (en) * | 2014-12-22 | 2015-04-22 | 深圳市朗特电子有限公司 | Liquid temperature detection system and liquid temperature detection method |
| CN204967367U (en) * | 2015-09-22 | 2016-01-13 | 广西职业技术学院 | Notebook computer battery protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103490389B (en) | Battery protecting circuit and system | |
| CN103928958B (en) | A kind of charging and discharging lithium battery management circuit and lithium battery management system | |
| CN104348233A (en) | Battery protection circuit and system | |
| CN106532801A (en) | Charging wake-up circuit for battery management system | |
| CN103762650B (en) | A kind of single USB port stand-by power supply based on equilibrium charging technology | |
| CN102882244A (en) | Battery managing system | |
| CN103746446B (en) | A kind of uninterrupted power supply circuit and electronic product | |
| CN102904291A (en) | Charging device and charging control method | |
| CN202014087U (en) | Lithium battery charging protection circuit for portable system | |
| CN201422027Y (en) | Charge-discharge circuit of double cell | |
| CN204376434U (en) | Battery protecting circuit | |
| CN204290475U (en) | Power supply switch circuit and electronic equipment | |
| CN204290464U (en) | Power supply circuits and electronic equipment | |
| CN105048422A (en) | Switch transistor voltage drop holding circuit and application of switch transistor voltage drop holding circuit in lithium battery protection circuit | |
| CN101800433A (en) | Lithium battery overcharge-prevention realization method based on protective chip and realization circuit | |
| CN208001152U (en) | Battery protection device and load device | |
| CN202153645U (en) | Electric device based on OTG interface charging | |
| CN202550600U (en) | Charging activation apparatus of mobile terminal battery | |
| CN101316044A (en) | Charging device capable of providing backward current and inrush current protection | |
| CN204967367U (en) | Notebook computer battery protection circuit | |
| CN106532154B (en) | Novel lithium battery power supply management circuit | |
| CN209344816U (en) | Lithium battery protection board | |
| CN204651614U (en) | A kind of data wire with charging instruction | |
| CN204089176U (en) | Battery pack protection plate circuit, battery pack protection plate, battery component | |
| CN203103929U (en) | Protection circuit for lithium battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151125 |
|
| WD01 | Invention patent application deemed withdrawn after publication |