CN103532105A - Protective circuit for battery - Google Patents
Protective circuit for battery Download PDFInfo
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- CN103532105A CN103532105A CN201310521232.7A CN201310521232A CN103532105A CN 103532105 A CN103532105 A CN 103532105A CN 201310521232 A CN201310521232 A CN 201310521232A CN 103532105 A CN103532105 A CN 103532105A
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- resistance
- effect transistor
- field effect
- battery
- triode
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a protective circuit for a battery. One end of a variable resistor R1 is connected with the drain of a field-effect tube MOS1, and the other end of the variable resistor R1 is connected onto the cathode of a diode; the regulating end of the variable resistor R1 is connected with the grid of the field-effect tube MOS1; the source of the field-effect tube MOS1 is connected with a variable resistor R2; the resistor R2 is serially connected with a resistor R3, and the common end is connected with the in-phase input end of a comparer; the cathode of the diode is connected with the inverted input end of the comparer; the comparer is connected with a feedback resistor; the output end of the comparer is connected onto the base of a triode through a resistor R6; the pole E of the triode is grounded, and the pole C of the triode is connected onto the grid of a field-effect tube MOS2; a resistor R7 is connected between the pole C of the triode and the source of the field-effect tube MOS1; the drain of the field-effect tube MOS2 is connected with the source of the field-effect tube MOS1. The protective circuit for the battery has the advantages of protecting the battery through the hysteresis principle and prolonging the service life of the battery.
Description
Technical field
The present invention relates to integrated circuit fields, relate in particular a kind of protective circuit for battery.
Background technology
A lot of equipment all can be used battery, and especially to those unattended equipment, it is as stand-by power supply, i.e., after alternating current power-off, battery is just started working.When battery is protected; battery is carried out to voltage protection; when cell voltage drops to certain value, loop will be disconnected, but due to after load disconnection; cell voltage can rise rapidly; powering load again, battery will repeat the process of " disconnect-power supply-disconnect-power supply " like this, and this bring very large impact will to the life-span of battery; one, open in a disconnected process, probably can damage battery.
Summary of the invention
The invention provides a kind of protective circuit for battery, it utilizes hysteresis principle to protect battery, avoids battery to be absorbed in the process of " disconnect-power supply-disconnect-power supply ", the useful life of improving battery.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
A kind of protective circuit for battery, it comprises variable resistor R1, one end of described variable resistor R1 is connected with the drain electrode of field effect transistor MOS1 and is connected on power supply simultaneously, and the other end is connected on the negative electrode of diode, and the adjustable side of variable resistor R1 is connected on the grid of field effect transistor MOS1; The plus earth of described diode; On the source electrode of described field effect transistor MOS1, be connected with resistance R 2, in described resistance R 2, be in series with resistance R 3; Described resistance R 2 and the common port of resistance R 3 are connected on the in-phase input end of comparator, and the negative electrode of described diode is connected on the inverting input of comparator, is connected with resistance R 4 between the output of described comparator and inverting input; The output of described comparator is connected in the base stage of triode by resistance R 6; The grounded emitter of described triode, collector electrode is connected on the grid of field effect transistor MOS2, between the collector electrode of described triode and the source electrode of field effect transistor MOS1, is connected with resistance R 7; The drain electrode of described field effect transistor MOS2 is connected on the source electrode of field effect transistor MOS1; Between the source electrode of described field effect transistor MOS2 and ground, be connected with resistance R 8.
Further technical scheme is:
Described resistance R 2 and the resistance value ratio of resistance R 3 are 4:1.
Described comparator is LM2903D.
The maximum adjustable value of described variable resistor R1 is 100K Ω.
Compared with prior art, the invention has the beneficial effects as follows:
1, the present invention utilizes comparator to form to have the protective circuit of hysteresis function, when cell voltage disconnects during lower than certain value, avoids battery to be absorbed in the process of " disconnect-power supply-disconnect-power supply ", and battery is protected.
2, circuit structure of the present invention is simple, and battery is protected, and can improve the useful life of battery.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.Embodiments of the present invention include but not limited to the following example.
[embodiment]
A kind of protective circuit for battery as shown in Figure 1, it comprises variable resistor R1, one end of described variable resistor R1 is connected and is connected on power supply simultaneously with the drain electrode of field effect transistor MOS1, the other end is connected on the negative electrode of diode, and the adjustable side of variable resistor R1 is connected on the grid of field effect transistor MOS1; The plus earth of described diode; On the source electrode of described field effect transistor MOS1, be connected with resistance R 2, in described resistance R 2, be in series with resistance R 3; Described resistance R 2 and the common port of resistance R 3 are connected on the in-phase input end of comparator, and the negative electrode of described diode is connected on the inverting input of comparator, is connected with resistance R 4 between the output of described comparator and inverting input; The output of described comparator is connected in the base stage of triode by resistance R 6; The grounded emitter of described triode, collector electrode is connected on the grid of field effect transistor MOS2, between the collector electrode of described triode and the source electrode of field effect transistor MOS1, is connected with resistance R 7; The drain electrode of described field effect transistor MOS2 is connected on the source electrode of field effect transistor MOS1; Between the source electrode of described field effect transistor MOS2 and ground, be connected with resistance R 8.
The present invention utilizes comparator to form the comparison circuit with hysteresis function, resistance R 2 and resistance R 3 series connection provide a reference voltage to comparator, another reference voltage is produced by diode, and it can adopt LM285Z, and it can reduce battery greatly in the power consumption of low-voltage dead lock state.Being switched on or switched off of field effect transistor MOS2, triode controlled in the output of comparator.When battery voltage drop is to a certain extent time, triode turn-offs, and protective circuit and battery disconnection that comparator is formed reduce the energy consumption of battery; When cell voltage recovers, triode conducting, circuit is reworked.Be that it can avoid battery to be absorbed in the process of " disconnect-power supply-disconnect-power supply ", to protect battery, improve the useful life of battery.In circuit, field effect transistor MOS1 and field effect transistor MOS2 are P type field effect transistor.
During due to reference voltage, by cell voltage, provided, he must be than little many of cell voltage, but this voltage should be too not low yet, summary, and described resistance R 2 and the resistance value ratio of resistance R 3 are 4:1.
Described comparator is LM2903D.LM2903D is two-way differential comparator, and its low-power consumption can reduce the power consumption of whole circuit.
In order further to strengthen the sensitivity of this circuit, the maximum adjustable value of described variable resistor R1 is 100K Ω.
Be as mentioned above embodiments of the invention.The present invention is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (4)
1. the protective circuit for battery, it is characterized in that: it comprises variable resistor R1, one end of described variable resistor R1 is connected and is connected on power supply simultaneously with the drain electrode of field effect transistor MOS1, the other end is connected on the negative electrode of diode, and the adjustable side of variable resistor R1 is connected on the grid of field effect transistor MOS1; The plus earth of described diode; On the source electrode of described field effect transistor MOS1, be connected with resistance R 2, in described resistance R 2, be in series with resistance R 3; Described resistance R 2 and the common port of resistance R 3 are connected on the in-phase input end of comparator, and the negative electrode of described diode is connected on the inverting input of comparator, is connected with resistance R 4 between the output of described comparator and inverting input; The output of described comparator is connected in the base stage of triode by resistance R 6; The grounded emitter of described triode, collector electrode is connected on the grid of field effect transistor MOS2, between the collector electrode of described triode and the source electrode of field effect transistor MOS1, is connected with resistance R 7; The drain electrode of described field effect transistor MOS2 is connected on the source electrode of field effect transistor MOS1; Between the source electrode of described field effect transistor MOS2 and ground, be connected with resistance R 8.
2. a kind of protective circuit for battery according to claim 1, is characterized in that: described resistance R 2 and the resistance value ratio of resistance R 3 are 4:1.
3. a kind of protective circuit for battery according to claim 1, is characterized in that: described comparator is LM2903D.
4. a kind of protective circuit for battery according to claim 1, is characterized in that: the maximum adjustable value of described variable resistor R1 is 100K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310521232.7A CN103532105A (en) | 2013-10-30 | 2013-10-30 | Protective circuit for battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310521232.7A CN103532105A (en) | 2013-10-30 | 2013-10-30 | Protective circuit for battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103532105A true CN103532105A (en) | 2014-01-22 |
Family
ID=49933906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310521232.7A Pending CN103532105A (en) | 2013-10-30 | 2013-10-30 | Protective circuit for battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103532105A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037724A (en) * | 2014-06-12 | 2014-09-10 | 四川联友电讯技术有限公司 | Overvoltage protection communication base station |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872958A (en) * | 2010-01-14 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Input voltage under-voltage protection circuit of switching power supply |
| US20120043925A1 (en) * | 2010-08-20 | 2012-02-23 | Hon Hai Precision Industry Co., Ltd. | Protection circuit for battery and battery charger apparatus using the same |
| CN102801192A (en) * | 2012-08-10 | 2012-11-28 | 江苏大学 | Wireless sensor network node solar charging and storage battery discharging protective circuit |
-
2013
- 2013-10-30 CN CN201310521232.7A patent/CN103532105A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872958A (en) * | 2010-01-14 | 2010-10-27 | 杭州海康威视数字技术股份有限公司 | Input voltage under-voltage protection circuit of switching power supply |
| US20120043925A1 (en) * | 2010-08-20 | 2012-02-23 | Hon Hai Precision Industry Co., Ltd. | Protection circuit for battery and battery charger apparatus using the same |
| CN102801192A (en) * | 2012-08-10 | 2012-11-28 | 江苏大学 | Wireless sensor network node solar charging and storage battery discharging protective circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104037724A (en) * | 2014-06-12 | 2014-09-10 | 四川联友电讯技术有限公司 | Overvoltage protection communication base station |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
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Application publication date: 20140122 |