CN201113408Y - Lithium battery electric supply control protection circuit - Google Patents
Lithium battery electric supply control protection circuit Download PDFInfo
- Publication number
- CN201113408Y CN201113408Y CNU2007200468074U CN200720046807U CN201113408Y CN 201113408 Y CN201113408 Y CN 201113408Y CN U2007200468074 U CNU2007200468074 U CN U2007200468074U CN 200720046807 U CN200720046807 U CN 200720046807U CN 201113408 Y CN201113408 Y CN 201113408Y
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- voltage
- battery
- shutoff
- hardware
- detection module
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Abstract
The utility model provides a lithium battery power supply control protecting circuit and a control protecting method which control the power supply of the battery by detecting the battery voltage, prevent the overdischarge and shut off the battery thoroughly by software. The circuit consists of a voltage comparing module (1), a soft shutoff detecting module (2), a hardware shutoff detecting module (3) and a hardware open detecting module (4), wherein, the voltage comparing module adopts a voltage detecting chip (U1) with a model number of HT7027, one end of the voltage detecting chip is connected with one end of a shutoff keystroke (S2) in the hardware shutoff detecting module (3), an open button (S1) is connected with an emitter of a switch transistor (Q1) in the hardware open detecting module, the emitter of the switch transistor (Q1) is the battery input terminal, a collector is the battery output terminal; an input terminal of a shutoff transistor (Q3) in the software shutoff detecting module is connected with a control foot of an SCM, an output terminal is connected with an output foot of the voltage detecting chip.
Description
Technical field
The utility model is a kind of circuit of building based on voltage checking chip, and by the detection to cell voltage, the power supply of control battery prevents overdischarge, and can thoroughly turn-off battery by software.Belong to the technical field that power automatic device is made.
Background technology
In power load control system, owing to need under the situation of outage, work on, so battery power supply in support has been installed, if but lithium battery does not add control, and cause the overdischarge meeting to make battery failure, therefore designed this circuit.And not only price is high for existing battery discharge managing chip, and function singleness, can't satisfy function and expand.
Summary of the invention
Technical problem: the purpose of this utility model provides a kind of lithium battery power supply control protection circuit, utilizes voltage checking chip to detect cell voltage, control battery discharge time, shutoff voltage in good time.In the outage of device working power, during reserve battery work, finished after the power down process program in good time, directly turn-off powered battery by software.When not having the power supply power supply, can reuse powered battery by button.
Technical scheme: in order to realize above purpose, lithium battery power supply control of the present utility model and protective circuit are opened detection module and are formed by voltage comparison module, software switching-off detection module, hardware shutoff detection module, hardware; Wherein, voltage comparison module is used the voltage checking chip of model as HT7027, the end that 1 end of voltage checking chip and hardware turn-off the shutoff button in the detection module joins, opening button and hardware opens the emitter of the switching transistor in the detection module and joins, the emission of switching transistor is cell input terminal very, and current collection is the battery output very; The transistorized input of shutoff in the software switching-off detection module connects the control pin of single-chip microcomputer, the output pin of output termination voltage checking chip.
The lithium battery power supply control of the present utility model and the control guard method of protective circuit detect cell voltage by utilizing voltage checking chip, control battery shutoff voltage, and concrete grammar is:
2 pin of voltage checking chip judge whether current voltage is higher than shutoff voltage, if be higher than, then 1 pin of output pin is high, and powered battery is provided; If be lower than shutoff voltage, then 1 pin of output pin is low, stops powered battery;
When the software switching-off Enable Pin is a transistorized base stage when being high, provide powered battery; When low, stop powered battery;
When hardware shutoff button is pressed, stop powered battery; At ordinary times, provide powered battery,
Again powering when hardware makes when opening button and pressing, if cell voltage is higher than shutoff voltage, then provides powered battery.
Beneficial effect: entire circuit has following characteristics:
A) applied widely.The battery that can adapt to various voltages provides different shutoff reference voltages by electric resistance partial pressure.
B) extended function is many.Can software switching-off, button turn-offs, and button is powered again.
C) circuit cost is low.With respect to the reserve battery control chip, because it is low to chip design, manufacture level requirement to adopt multichip devices to build circuit, price can reduce greatly.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
The utility model adopts the pattern of building circuit, and with a slice high-accuracy voltage comparable chip HT7050, a slice large power triode FZT788B and small number of devices are formed.
This circuit is opened detection module 4 and is formed by voltage comparison module 1, software switching-off detection module 2, hardware shutoff detection module 3, hardware; Wherein, voltage comparison module 1 is used the voltage checking chip U1 of model as HT7027, the end that 1 end of voltage checking chip U1 and hardware turn-off the shutoff button S2 in the detection module 3 joins, opening button S1 and hardware opens the emitter of the switching transistor Q1 in the detection module 4 and joins, the emission of switching transistor Q1 is cell input terminal very, and current collection is the battery output very; The input of shutoff transistor Q3 in the software switching-off detection module 2 connects the control pin of single-chip microcomputer, the output pin of output termination voltage checking chip U1.
Fig. 2 is circuit theory diagrams of the present utility model.
Second resistance R, 2, the three resistance R, 3, the five resistance R 5 are current-limiting resistances.
Because the existence of the first diode D1 makes under any circumstance, can only be that battery is outwards powered, and can not pour in down a chimney to battery by external voltage.
The model of voltage checking chip U1 is that HT7027 is the 2.7V voltage checking chip.With first resistance R 1 and the 4th resistance R 4 dividing potential drops of 1% precision, to detect 6.3V voltage.(by changing the battery that divider resistance can detect different voltages.)
The utility model detects cell voltage by utilizing voltage checking chip, control battery shutoff voltage, and concrete grammar is:
2 pin of voltage checking chip U1 judge whether current voltage is higher than shutoff voltage, if be higher than, then 1 pin of output pin is high, and powered battery is provided; If be lower than shutoff voltage, then 1 pin of output pin is low, stops powered battery;
When the software switching-off Enable Pin is the base stage of transistor Q3 when being high, provide powered battery; When low, stop powered battery;
When hardware shutoff button S2 presses, stop powered battery; At ordinary times, provide powered battery,
Again powering when hardware makes when opening button S1 and pressing, if cell voltage is higher than shutoff voltage, then provides powered battery.
Example:
When only battery-powered, if cell voltage is higher than 6.3V, output 1 pin (OUT) of voltage checking chip HT7027 is high, makes the first transistor Q1, transistor seconds Q2 conducting, and cell voltage exports VCC22V to, powers to main circuit.
When cell voltage was lower than 6.3V, output 1 pin (OUT) of voltage checking chip HT7027 was low, and less than 0.7V, because the effect of the clamper second diode D2 makes the first transistor Q1, transistor seconds Q2 ends, and battery is no longer powered.The software switching-off control pin is connected on the pin of single-chip microcomputer, is high at ordinary times, and the 3rd transistor Q3 triode ends the circuit operate as normal.
The 6th resistance R 6, the seven resistance R 7 are divider resistances, can make software switching-off control pin (SHUTDOWN) adapt to the output control voltage of various single-chip microcomputers.
When software switching-off control pin (SHUTDOWN) is changed to when low, the 3rd transistor Q3 triode conducting causes the first transistor Q1, and transistor seconds ends, and battery is no longer powered, and has just realized software switching-off.
When pressing the button switch S 2, the first transistor Q1, transistor seconds ends, and battery is no longer powered, and has realized manual shutoff.
Under the situation of having cut off the power supply, press the button switch S 1, if cell voltage is higher than 6.3V, battery will be powered again.
Below be the model of each used device of the present invention:
| The device label | The function title | The device model |
| D1 | The Surface Mount diode | MBRS240LT3 |
| S1，S2 | Button | B3F-400012*5 |
| Q1 | The Surface Mount triode | FZT788B |
| Q2 | The Surface Mount triode | FMMT3904 |
| Q3 | The Surface Mount triode | FMMT3906 |
| U1 | The Surface Mount voltage checking chip | HT7027 |
| R1 | Surface-mount resistor | CR0603-1/8W-6.8 |
| R2 | Surface-mount resistor | CR0603-1/8W-20K |
| R3 | Surface-mount resistor | CR0603-1/8W-1.5K |
| R4 | Surface-mount resistor | CR0603-1/8W-5.1 |
| R5，R7 | Surface-mount resistor | CR0603-1/8W-10K |
| R6 | Surface-mount resistor | CR0603-1/8W-1k |
Claims (1)
1. lithium battery power supply control protection circuit, it is characterized in that this circuit by voltage comparison module (1), software switching-off detection module (2), hardware turn-off detection module (3), hardware is opened detection module (4) and is formed; Wherein, voltage comparison module (1) is used the voltage checking chip (U1) of model as HT7027, the end that 1 end of voltage checking chip (U1) and hardware turn-off the shutoff button (S2) in the detection module (3) joins, opening button (S1) and hardware opens the emitter of the switching transistor (Q1) in the detection module (4) and joins, the emission of switching transistor (Q1) is cell input terminal very, and current collection is the battery output very; The input of the shutoff transistor (Q3) in the software switching-off detection module (2) connects the control pin of single-chip microcomputer, the output pin of output termination voltage checking chip (U1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200468074U CN201113408Y (en) | 2007-09-21 | 2007-09-21 | Lithium battery electric supply control protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200468074U CN201113408Y (en) | 2007-09-21 | 2007-09-21 | Lithium battery electric supply control protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113408Y true CN201113408Y (en) | 2008-09-10 |
Family
ID=39965153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200468074U Expired - Fee Related CN201113408Y (en) | 2007-09-21 | 2007-09-21 | Lithium battery electric supply control protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201113408Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI413329B (en) * | 2009-06-09 | 2013-10-21 | Hon Hai Prec Ind Co Ltd | Battery overdischarge protecting apparatus |
| CN109347466A (en) * | 2018-11-12 | 2019-02-15 | 天津航空机电有限公司 | A kind of switching circuit and electronic equipment |
-
2007
- 2007-09-21 CN CNU2007200468074U patent/CN201113408Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI413329B (en) * | 2009-06-09 | 2013-10-21 | Hon Hai Prec Ind Co Ltd | Battery overdischarge protecting apparatus |
| CN109347466A (en) * | 2018-11-12 | 2019-02-15 | 天津航空机电有限公司 | A kind of switching circuit and electronic equipment |
| CN109347466B (en) * | 2018-11-12 | 2023-01-13 | 天津航空机电有限公司 | Switching circuit and electronic equipment |
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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: 20080910 Termination date: 20110921 |