CN201781299U - Circuit for controlling on/off of battery charging path and battery - Google Patents
Circuit for controlling on/off of battery charging path and battery Download PDFInfo
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- CN201781299U CN201781299U CN2010202875306U CN201020287530U CN201781299U CN 201781299 U CN201781299 U CN 201781299U CN 2010202875306 U CN2010202875306 U CN 2010202875306U CN 201020287530 U CN201020287530 U CN 201020287530U CN 201781299 U CN201781299 U CN 201781299U
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a circuit for controlling the on/off of a battery charging path and a battery, and adopts the following design principle that a detection pin is arranged on the battery and is connected with a detection resistor, the detection resistor is used for detecting whether the battery is inserted or withdrawn, and the on/off of the charging path is controlled through a switching tube; when the battery is inserted for charging, the detection resistor of the battery is connected into the circuit, the switching tube is conducted, and the charging path is conducted; and when the battery is withdrawn, the detection resistor of the battery is switched off in the circuit, the switching tube is turned off, and the charging path is disconnected. The utility model can achieve the purpose of surge protection quickly and reliably.
Description
Technical field
The utility model relates to a kind of circuit that prevents to damage charging management chip, in particular a kind of circuit of controlling battery charge path break-make.
Background technology
At present, increasing portable equipment all uses powered battery on the market, because of the restriction of battery electric quantity, needs often to battery charge.Battery is in charging process, if extracted suddenly, and charger also continues on the equipment of being inserted in, and may occur surge voltage like this and cause charging management chip to damage.
Therefore, prior art has yet to be improved and developed.
Given this, at this charging device that needs, can turn-off the method for charging after battery is extracted when proposing a kind of the charging rapidly.
The utility model content
The purpose of this utility model is to provide a kind of circuit of controlling battery charge path break-make, is intended to solve existing charge path, thereby can occur the problem that surge voltage causes charging management chip to damage when battery is pulled out in charging process.
The technical solution of the utility model is as follows:
A kind of circuit of controlling battery charge path break-make is characterized in that, comprises detecting resistance, first triode, second triode and first field effect transistor;
The base stage joint detection resistance of described first triode, the other end ground connection of described detection resistance; The collector electrode of described first triode connects the base stage of second triode, and the collector electrode of described second triode connects the grid of first field effect transistor, and the source electrode of described first field effect transistor and drain electrode are connected on the charge path;
The base stage of described first triode connects first resistance and second resistance, and the input of first resistance connects charging input end, second grounding through resistance;
The base stage of described second triode connects the 3rd resistance, and the input of the 3rd resistance connects charging input end; The grid of described first field effect transistor connects the 4th resistance, and the input of the 4th resistance connects charging input end.
The circuit of described control battery charge path break-make, wherein, described detection resistance is arranged on inside battery, and described battery is also set up one and is detected pin, described detection resistance joint detection pin; One second pin is set on the base stage of described first triode, and described second pin is connected to detection resistance by detecting pin.
The circuit of described control battery charge path break-make, wherein, described first field effect transistor is a P type field effect transistor.
The circuit of described control battery charge path break-make, wherein, described detection resistance is made as tens kilo-ohms.
A kind of battery, wherein, described inside battery comprises that one detects resistance, and outside batteries is provided with a detection pin, described detection resistance one end joint detection pin; Other end ground connection.
The beneficial effects of the utility model: whether the utility model has the switching device through and off of pulling out in the control charge circuit by battery in the detection resistance detection charging process of utilizing battery.Because all be to use by hardware approach to realize in the whole process, so can reach the purpose of surge protection fast.
Description of drawings
Fig. 1 is the circuit diagram of the control battery charge path break-make that provides of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.
The method of the control battery charge path break-make that the utility model proposes, its specific design principle is: be provided with one and detect pin on battery, described detection pin connects one and detects resistance R 5; Utilize detection resistance R 5 to detect battery and whether insert or extract, and pass through the through and off of switch controlled charge path; When battery inserted charging, the detection resistance R 5 of battery was connected in the circuit, switching tube conducting, charge path conducting; When battery was pulled out, the detection resistance R 5 of battery was disconnected in circuit, and switching tube is turned off, and charge path disconnects.
Referring to Fig. 1, the circuit of described control battery charge path break-make comprises detection resistance R 5, the first triode Q1, the second triode Q2 and the first field effect transistor Q3, and described first field effect transistor is a P type field effect transistor, and described detection resistance is made as tens kilo-ohms.
The base stage B joint detection resistance R 5 of the described first triode Q1, described detection resistance R 5 other end ground connection, the collector electrode C of the described first triode Q1 connects the base stage B of the second triode Q2, the collector electrode C of the described second triode Q2 connects the grid G of the first field effect transistor Q3, and the source S of the described first field effect transistor Q3 and drain D are connected on the charge path; The input that the base stage B of the described first triode Q1 connects first resistance R 1 and second resistance R, 2, the first resistance R 1 connects charging input end VCHG, the other end ground connection of second resistance R 2; The input that the base stage B of the described second triode Q2 connects the 3rd resistance R 3, the three resistance R 3 connects charging input end VCHG; The input that the grid G of the described first field effect transistor Q3 connects the 4th resistance R 4, the four resistance R 4 connects charging input end VCHG.
Described in the present embodiment detection resistance R 5 is arranged on inside battery, and described battery is also set up one and detected pin (not shown), described detection resistance R 5 joint detection pins; One second pin is set on the base stage B of the described first triode Q1, and described second pin is connected to detection resistance R 5 by detecting pin.
The operation principle of the circuit of described control battery charge path break-make is as follows:
As can be known from Fig. 1, when battery is not extracted, when promptly detecting base stage B that resistance R 5 is connected the first triode Q1 and going up, so the magnitude of voltage VR on the base stage B of the first triode Q1 is:
Wherein, VCHG is the direct voltage of charging input.
When battery is pulled out, R5 this moment, the base stage B from the first triode Q1 disconnected, and the value of VR is at this moment:
From formula (1) and formula (2) as can be known, magnitude of voltage VR increased when battery was extracted.In charging process, when battery was not extracted, the voltage VR on the base stage B of the first triode Q1 was less than the conducting voltage VBE of the first triode Q1, and the first triode Q1 turn-offs, and the second triode Q2 conducting is the first field effect transistor Q3 conducting then, and battery charges normal.VR increases when battery is extracted, voltage VR on the base stage B of the first triode Q1 is just greater than the conducting voltage VBE of the first triode Q1, the first triode Q1 conducting, the second triode Q2 turn-offs then, and the first field effect transistor Q3 turn-offs, thereby disconnected charge path, effectively prevented the surge impact charging management chip.
The described first triode Q1, the second triode Q2 and the concrete break-make control procedure of the first field effect transistor Q3 are: when the first triode Q1 conducting, then the base voltage of the second triode Q2 is low level 0V, the base stage of the second triode Q2 and emitter voltage are less than its conducting voltage, so the second triode Q2 turn-offs.Voltage is VCHG to the grid (the G utmost point) of the first field effect transistor Q3 at this moment, and source electrode (the S utmost point) voltage also equals VCHG, thus do not satisfy the turn-on condition of PMOS pipe, so the first field effect transistor Q3 turn-offs.
When the first triode Q1 turn-offed, the base voltage of the second triode Q2 was VCHG, and base stage and emitter voltage are greater than its conducting voltage, thus the second triode Q2 conducting.This moment the first field effect transistor Q3 grid (the G utmost point) voltage be low level 0V, and source electrode (the S utmost point) voltage be VCHG greater than grid voltage, satisfy the turn-on condition of PMOS pipe, thus the first field effect transistor Q3 conducting, then charge path conducting.
Present embodiment also provides a kind of battery, and described inside battery comprises that one detects resistance, and outside batteries is provided with a detection pin, described detection resistance one end joint detection pin; Other end ground connection.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (5)
1. a circuit of controlling battery charge path break-make is characterized in that, comprises detecting resistance, first triode, second triode and first field effect transistor;
The base stage joint detection resistance of described first triode, the other end ground connection of described detection resistance; The collector electrode of described first triode connects the base stage of second triode, and the collector electrode of described second triode connects the grid of first field effect transistor, and the source electrode of described first field effect transistor and drain electrode are connected on the charge path;
The base stage of described first triode connects first resistance and second resistance, and the input of first resistance connects charging input end, second grounding through resistance;
The base stage of described second triode connects the 3rd resistance, and the input of the 3rd resistance connects charging input end; The grid of described first field effect transistor connects the 4th resistance, and the input of the 4th resistance connects charging input end.
2. the circuit of control battery charge according to claim 1 path break-make is characterized in that described detection resistance is arranged on inside battery, and described battery is also set up one and detected pin, described detection resistance joint detection pin; One second pin is set on the base stage of described first triode, and described second pin is connected to detection resistance by detecting pin.
3. the circuit of control battery charge according to claim 1 path break-make is characterized in that described first field effect transistor is a P type field effect transistor.
4. the circuit of control battery charge according to claim 2 path break-make is characterized in that described detection resistance is made as tens kilo-ohms.
5. a battery is characterized in that, described inside battery comprises that one detects resistance, and outside batteries is provided with a detection pin, described detection resistance one end joint detection pin; Other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202875306U CN201781299U (en) | 2010-08-05 | 2010-08-05 | Circuit for controlling on/off of battery charging path and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202875306U CN201781299U (en) | 2010-08-05 | 2010-08-05 | Circuit for controlling on/off of battery charging path and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201781299U true CN201781299U (en) | 2011-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202875306U Expired - Fee Related CN201781299U (en) | 2010-08-05 | 2010-08-05 | Circuit for controlling on/off of battery charging path and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201781299U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902061A (en) * | 2010-08-05 | 2010-12-01 | 惠州Tcl移动通信有限公司 | Method for controlling connection and disconnection of charge path of battery, circuit and battery |
| CN102291879A (en) * | 2011-05-19 | 2011-12-21 | 惠州Tcl移动通信有限公司 | Control circuit, method and device for charging indicator light as well as charging device |
-
2010
- 2010-08-05 CN CN2010202875306U patent/CN201781299U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101902061A (en) * | 2010-08-05 | 2010-12-01 | 惠州Tcl移动通信有限公司 | Method for controlling connection and disconnection of charge path of battery, circuit and battery |
| CN101902061B (en) * | 2010-08-05 | 2013-05-15 | 惠州Tcl移动通信有限公司 | Method for controlling connection and disconnection of charge path of battery, circuit and battery |
| CN102291879A (en) * | 2011-05-19 | 2011-12-21 | 惠州Tcl移动通信有限公司 | Control circuit, method and device for charging indicator light as well as charging device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20130805 |