CN203690903U - Battery under-voltage protection circuit - Google Patents
Battery under-voltage protection circuit Download PDFInfo
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- CN203690903U CN203690903U CN201420032406.3U CN201420032406U CN203690903U CN 203690903 U CN203690903 U CN 203690903U CN 201420032406 U CN201420032406 U CN 201420032406U CN 203690903 U CN203690903 U CN 203690903U
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- 230000004224 protection Effects 0.000 title claims abstract description 20
- 230000002459 sustained Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011105 stabilization Methods 0.000 abstract 2
- 238000007599 discharging Methods 0.000 abstract 1
- 230000002035 prolonged Effects 0.000 abstract 1
- 230000001681 protective Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002427 irreversible Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005670 sulfation reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model provides a battery under-voltage protection circuit. The battery under-voltage protection circuit comprises a starting capacitor C1, a discharging resistor R1, a pull-down resistor R2, a current-limiting resistor R3, a current-limiting resistor R4, a current-limiting resistor R5, a current-limiting resistor R8, a divider resistor R6, a divider resistor R7, a voltage-stabilization diode D1, a voltage-stabilization diode D2, an operational amplifier U1, a triode Q1 and an output relay K1. The battery under-voltage protection circuit is arranged between a battery and a load and is capable of automatically cutting off the connection between the battery and the load when the battery is under-voltage, so that the battery is protected; in addition, the battery under-voltage protection circuit has the advantages that the design is scientific, the structure is reasonable, the protection effect is good, and the service lifetime of the battery is prolonged.
Description
Technical field
The utility model relates to a kind of protective circuit, specifically, has related to a kind of Undervoltage protection circuit for battery.
Background technology
In industrial gasses detection application, gas alarm controller often comes, to presence detector power supply, in the time that having a power failure appears in main power supply, can work on for detector for power supply as main electricity and standby electricity with civil power and two kinds of power supplys of battery.While adopting powered battery, if low also the continuation to a certain extent of cell voltage can be caused certain damage to battery while electric discharge; When overdischarge, particularly send amount of heat with larger electric current overdischarge meeting, when overdischarge, sulfuric acid concentration subtracts very lowly, and irreversible sulfation appears in battery, will weaken widely the charge acceptance of battery, has shortened greatly the life-span of battery.
After battery undervoltage, can not cut off being in time connected of battery and load, can make battery continuous discharge, cause overdischarge, be connected with detector by protective circuit for the existing battery of head it off is many, when after battery undervoltage, automatically cut off being connected of battery and load.The working power of these protective circuits mostly is battery and provides; although can cut being connected of battery and detector; stop detector powering; but battery is still to protective circuit power supply, if if protective circuit power consumption is larger after cutting off load supplying, works long hours and also easily cause overdischarge; overdischarge easily damages battery; battery is often changed, and the cost that brings material and safeguard brings the inconvenience in use simultaneously.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, thus provide a kind of design science, rational in infrastructure, protect effective and extend the Undervoltage protection circuit for battery of battery.
To achieve these goals, the technical scheme that the utility model adopts is: a kind of Undervoltage protection circuit for battery, it comprises start-up capacitance C1, discharge resistance R1, pull down resistor R2, current-limiting resistance R3, current-limiting resistance R4, current-limiting resistance R5, current-limiting resistance R8, divider resistance R6, divider resistance R7, zener diode D1, zener diode D2, operational amplifier U1, triode Q1 and output relay K1, wherein, the negative pole of described start-up capacitance C1 connects one end of described pull down resistor R2, the other end of the positive pole of described start-up capacitance C1 and described pull down resistor R2 is as cell input terminal, described discharge resistance R1 is connected in parallel on the both positive and negative polarity of described start-up capacitance C1, the positive pole of described start-up capacitance C1 connects respectively one end of described output relay K1 coil and one end of described output relay K1 control switch, one end of described pull down resistor R2 connects respectively one end of described current-limiting resistance R3 and one end of described current-limiting resistance R4, the other end of described pull down resistor R2 connects respectively the anode of described zener diode D1, one end of described current-limiting resistance R8, the power supply negative input of described operational amplifier U1, one end of the anode of described zener diode D2 and described divider resistance R7, the other end of described current-limiting resistance R3 connects respectively the base stage of negative electrode and the described triode Q1 of described zener diode D1, the collector electrode of described triode Q1 connects the other end of described output relay K1 coil, the emitter of described triode Q1 connects the other end of described current-limiting resistance R8, the other end of described current-limiting resistance R4 connects the output of described operational amplifier U1, the negative input of described operational amplifier U1 connects respectively one end of described current-limiting resistance R5 and the negative electrode of described zener diode D2, the other end of described current-limiting resistance R5 connects the other end of described output relay K1 control switch, the positive input of described operational amplifier U1 connects respectively one end of the other end and the described divider resistance R6 of described divider resistance R7, the other end of described divider resistance R6 connects the other end of described output relay K1 control switch, the power supply positive input of described operational amplifier U1 connects the other end of described output relay K1 control switch, one end of the other end of described divider resistance R6 and described divider resistance R7 is as load link.
Based on above-mentioned, it also comprises sustained diode 3, and the negative electrode of described sustained diode 3 connects one end of described output relay K1 coil, the other end of output relay K1 coil described in the anodic bonding of described sustained diode 3.
Based on above-mentioned, it also comprises switch S 1, and the positive pole of described start-up capacitance C1 connects described switch S 1 one end, and the other end of described switch S 1 other end and described pull down resistor R2 is as cell input terminal.
The relative prior art of the utility model has substantive distinguishing features and progress, specifically, the utility model is different from traditional protective circuit, after battery and load are cut off, battery stops, to protective circuit power supply, avoiding battery over-discharge, extends battery, reduce battery altering, reduce maintenance cost; This Undervoltage protection circuit for battery is arranged between battery and load, when circuit is connected battery, the instantaneous energising of described output relay K1 coil, and then closed described output relay K1 control switch, then whole circuit is started working, and described operational amplifier U1 compares the voltage collecting, control conducting and the cut-off of triode Q1 with this, then in the time of battery undervoltage, disconnect being connected of battery and load, meanwhile, battery stops to this circuit supply; It has advantages of design science, rational in infrastructure, protect effective and extend battery.
Brief description of the drawings
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Below by embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1; a kind of Undervoltage protection circuit for battery, it comprises start-up capacitance C1, discharge resistance R1, pull down resistor R2, current-limiting resistance R3, current-limiting resistance R4, current-limiting resistance R5, current-limiting resistance R8, divider resistance R6, divider resistance R7, zener diode D1, zener diode D2, operational amplifier U1, triode Q1 and output relay K1.
Wherein, described start-up capacitance C1 is polar capacitor, the negative pole of described start-up capacitance C1 connects one end of described pull down resistor R2, the other end of the positive pole of described start-up capacitance C1 and described pull down resistor R2 is as cell input terminal, connect battery with this, control for convenient, the positive pole of described start-up capacitance C1 connects described switch S 1, and battery connects cell input terminal by described switch S 1.
Described discharge resistance R1 is connected in parallel on the both positive and negative polarity of described start-up capacitance C1, the positive pole of described start-up capacitance C1 connects respectively one end of described output relay K1 coil and one end of described output relay K1 control switch, one end of described pull down resistor R2 connects respectively one end of described current-limiting resistance R3 and one end of described current-limiting resistance R4, the other end of described pull down resistor R2 connects respectively the anode of described zener diode D1, one end of described current-limiting resistance R8, the power supply negative input of described operational amplifier U1, one end of the anode of described zener diode D2 and described divider resistance R7, the other end of described current-limiting resistance R3 connects respectively the base stage of negative electrode and the described triode Q1 of described zener diode D1, the collector electrode of described triode Q1 connects the other end of described output relay K1 coil, the emitter of described triode Q1 connects the other end of described current-limiting resistance R8, described triode Q1 is NPN type triode, the other end of described current-limiting resistance R4 connects the output of described operational amplifier U1, the negative input of described operational amplifier U1 connects respectively one end of described current-limiting resistance R5 and the negative electrode of described zener diode D2, the other end of described current-limiting resistance R5 connects the other end of described output relay K1 control switch, the positive input of described operational amplifier U1 connects respectively one end of the other end and the described divider resistance R6 of described divider resistance R7, the other end of described divider resistance R6 connects the other end of described output relay K1 control switch, the power supply positive input of described operational amplifier U1 connects the other end of described output relay K1 control switch, one end of the other end of described divider resistance R6 and described divider resistance R7 is as load link, for example connect rear class load with this: detector, this circuit also can be between other battery and load, plays the effect of protection battery.
In order to ensure the accurate keying of described output relay K1 control switch, it also comprises sustained diode 3, the negative electrode of described sustained diode 3 connects one end of described output relay K1 coil, the other end of output relay K1 coil described in the anodic bonding of described sustained diode 3.
The operation principle of this Undervoltage protection circuit for battery: need to enable stand-by power supply time; Closing Switch S1; now start-up capacitance C1 moment is in conducting state; cell voltage is applied on triode Q1 by start-up capacitance C1 and current-limiting resistance R3; triode Q1 conducting, now described output relay K1 coil electricity, described output relay K1 control switch closure; battery powers to the load simultaneously, and whole Undervoltage protection circuit for battery is started working.
Battery is connected, and powers to the load, and now the power input of described operational amplifier U1 switches on power, and described operational amplifier U1 starts working.Cell voltage voltage V1 after divider resistance R6, divider resistance R7 is input to the positive input of operational amplifier U1, and the negative input of operational amplifier U1 receives the reference voltage V 2 through zener diode D2 and current-limiting resistance R5 simultaneously.
When voltage V1 is greater than reference voltage V 2, operational amplifier U1 output output high level, is applied to triode Q1 through current-limiting resistance R4 upper, keeps output relay K1 control switch closure; Start-up capacitance C1 is full of after electricity, and the conducting voltage of described triode Q1 is provided by operational amplifier U1, and the input voltage of zener diode D2 restriction triode Q1, effectively protects triode Q1, makes circuit working more reliable.
When V1 is less than reference voltage V 2, operational amplifier U1 output output low level, start-up capacitance C1 is full of after electricity, the voltage that is input to triode Q1 is down to low level by the pull down resistor R2 that start-up capacitance C1 negative pole connects, at this moment ensure triode Q1 cut-off with the low level acting in conjunction of operational amplifier U1 output, and then make described output relay K1 coil not charged, and described output relay K1 control switch turn-offs, and cut-out battery is connected with load; Now whole circuit cut off with being connected also of battery, while preventing battery undervoltage, and overdischarge.
In order to ensure the normal work of whole circuit, the resistance of discharge resistance R1 will, much larger than the resistance of pull down resistor R2, ensure with this reliability that output relay K1 opens and closes.
The utility model can be protected different batteries, by adjusting the size of divider resistance R6 and divider resistance R7, meets the demand to different battery under-voltage protections, increases the scope of application of this circuit.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characterictic is equal to replacement embodiment of the present utility model; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope of the utility model request protection.
Claims (3)
1. a Undervoltage protection circuit for battery, it is characterized in that: it comprises start-up capacitance C1, discharge resistance R1, pull down resistor R2, current-limiting resistance R3, current-limiting resistance R4, current-limiting resistance R5, current-limiting resistance R8, divider resistance R6, divider resistance R7, zener diode D1, zener diode D2, operational amplifier U1, triode Q1 and output relay K1, wherein, the negative pole of described start-up capacitance C1 connects one end of described pull down resistor R2, the other end of the positive pole of described start-up capacitance C1 and described pull down resistor R2 is as cell input terminal, described discharge resistance R1 is connected in parallel on the both positive and negative polarity of described start-up capacitance C1, the positive pole of described start-up capacitance C1 connects respectively one end of described output relay K1 coil and one end of described output relay K1 control switch, one end of described pull down resistor R2 connects respectively one end of described current-limiting resistance R3 and one end of described current-limiting resistance R4, the other end of described pull down resistor R2 connects respectively the anode of described zener diode D1, one end of described current-limiting resistance R8, the power supply negative input of described operational amplifier U1, one end of the anode of described zener diode D2 and described divider resistance R7, the other end of described current-limiting resistance R3 connects respectively the base stage of negative electrode and the described triode Q1 of described zener diode D1, the collector electrode of described triode Q1 connects the other end of described output relay K1 coil, the emitter of described triode Q1 connects the other end of described current-limiting resistance R8, the other end of described current-limiting resistance R4 connects the output of described operational amplifier U1, the negative input of described operational amplifier U1 connects respectively one end of described current-limiting resistance R5 and the negative electrode of described zener diode D2, the other end of described current-limiting resistance R5 connects the other end of described output relay K1 control switch, the positive input of described operational amplifier U1 connects respectively one end of the other end and the described divider resistance R6 of described divider resistance R7, the other end of described divider resistance R6 connects the other end of described output relay K1 control switch, the power supply positive input of described operational amplifier U1 connects the other end of described output relay K1 control switch, one end of the other end of described divider resistance R6 and described divider resistance R7 is as load link.
2. Undervoltage protection circuit for battery according to claim 1; it is characterized in that: it also comprises sustained diode 3; the negative electrode of described sustained diode 3 connects one end of described output relay K1 coil, the other end of output relay K1 coil described in the anodic bonding of described sustained diode 3.
3. Undervoltage protection circuit for battery according to claim 2; it is characterized in that: it also comprises switch S 1; the positive pole of described start-up capacitance C1 connects described switch S 1 one end, and the other end of described switch S 1 other end and described pull down resistor R2 is as cell input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420032406.3U CN203690903U (en) | 2014-01-20 | 2014-01-20 | Battery under-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420032406.3U CN203690903U (en) | 2014-01-20 | 2014-01-20 | Battery under-voltage protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203690903U true CN203690903U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420032406.3U Active CN203690903U (en) | 2014-01-20 | 2014-01-20 | Battery under-voltage protection circuit |
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| Country | Link |
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| CN (1) | CN203690903U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207535A (en) * | 2015-10-20 | 2015-12-30 | 安微天虹机电设备制造有限公司 | Intelligent control device for electric window openers |
| CN106253238A (en) * | 2016-08-19 | 2016-12-21 | 宁波中荣声学科技有限公司 | A kind of battery low-voltage latching circuit |
| TWI625025B (en) * | 2016-12-22 | 2018-05-21 | 華碩電腦股份有限公司 | Charge-discharge device and method for controlling the same |
-
2014
- 2014-01-20 CN CN201420032406.3U patent/CN203690903U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207535A (en) * | 2015-10-20 | 2015-12-30 | 安微天虹机电设备制造有限公司 | Intelligent control device for electric window openers |
| CN106253238A (en) * | 2016-08-19 | 2016-12-21 | 宁波中荣声学科技有限公司 | A kind of battery low-voltage latching circuit |
| TWI625025B (en) * | 2016-12-22 | 2018-05-21 | 華碩電腦股份有限公司 | Charge-discharge device and method for controlling the same |
| US10804713B2 (en) | 2016-12-22 | 2020-10-13 | Asustek Computer Inc. | Charge-discharge device and control method of the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169 Patentee after: Hanwei Technology Group Limited by Share Ltd Address before: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169 Patentee before: Henan Hanwei Electronics Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |