CN104600676A - Battery protection circuit, electric energy supply device and electronic device - Google Patents
Battery protection circuit, electric energy supply device and electronic device Download PDFInfo
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- CN104600676A CN104600676A CN201510047589.5A CN201510047589A CN104600676A CN 104600676 A CN104600676 A CN 104600676A CN 201510047589 A CN201510047589 A CN 201510047589A CN 104600676 A CN104600676 A CN 104600676A
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- battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery protection circuit, an electric energy supply device and an electronic device. The battery protection circuit is externally connected with a battery and comprises a battery protection chip for providing protection control signals to the battery, and the battery protection chip at least comprises a positive chip power supply input pin. The battery protection circuit further comprises a chip control switch which is arranged between the positive chip power supply input pin and the positive electrode of the battery and configured as the connected or disconnected status in a controlled way; when the chip control switch is in the connected status, the positive chip power supply input pin of the battery protection chip is connected with the positive electrode of the battery, so that the battery protection chip begins to operate; when the chip control switch is in the disconnected status, the positive chip power supply input pin of the battery protection chip is disconnected with the positive electrode of the battery, so that the battery protection chip stops to operate. Through the solution, the battery is excessively discharged because the battery protection chip consumes power, the service life of the battery is prolonged.
Description
Technical field
The present invention relates to a kind of power protection field, particularly a kind of battery protecting circuit, electric energy generator and electronic installation.
Background technology
Power supply is the important part of electronic equipment.Rechargeable battery wherein uses one more widely, and the mobile terminals such as current smart mobile phone, panel computer use rechargeable battery as power supply mostly.
The feature of rechargeable battery, particularly lithium ion battery itself, determine its can not be overcharged, cross put, overcurrent, short circuit and superhigh temperature discharge and recharge, therefore rechargeable battery generally needs matching battery protective circuit to use.The protective circuit of rechargeable battery is because of the difference such as supply power voltage of its protect IC used and battery; circuit and parameter different; but protection philosophy is similar; conventional secondary battery protective chip comprises: the AAT8632 series, DW01+ etc. of the MM3061 series of the S-8241 series of NSK, Japanese MITSUMI, FS312 and the FS313 series of the rich crystalline substance in Taiwan, Taiwan analogy science and technology; its operation principle is similar, just difference to some extent on design parameter.
Fig. 1 is the circuit theory diagrams of prior art battery protecting circuit; can use at Fig. 1 and give an account of any one secondary battery protective chip continued above; D1 and D2 two N-channel MOS pipes are as discharge protection switch and charging protection switch, and rechargeable battery exports electric energy from EB+ and EB-two ends.During charging, charge power supply is connected on EB+ and EB-two ends, and when the voltage of battery exceedes overvoltage threshold, the Cout pin output signal of battery protection chip makes the N-channel MOS pipe of D2 turn off, and rechargeable battery stops charging, prevents rechargeable battery from damaging because of overcharge.During battery discharge, when the voltage of battery is lower than when excessively putting threshold value, the Dout pin output signal of secondary battery protective chip makes the N-channel MOS pipe of D1 turn off, and rechargeable battery stops electric discharge, prevents rechargeable battery from damaging because of overdischarge.
The Vm pin of secondary battery protective chip is electric current induction input pin in addition; when discharging rechargeable battery electric current is excessive; the conduction voltage drop of D1 and D2 increases severely; the voltage that Vm pin senses arrives raises; the Dout pin output protection signal of rechargeable battery; D1 and D2 is turned off, prevents rechargeable battery overcurrent or short circuit.
Use above battery protecting circuit can realize the defencive function such as super-charge super-discharge and overcurrent of rechargeable battery; available protecting battery is avoided damaging because of improper use; but on the positive supply input pin Vdd of secondary battery protective chip and the negative supply input pin Vss positive pole that is connected to battery and negative pole; even if battery can be caused under non-powered state still there to be the power consumption of 0.1 microampere; although power consumption is very little, the long term accumulation under not using state still can cause battery to cross to put and cause scrapping.And be generally integrated in inside battery due to existing battery protecting circuit, even if idle after therefore battery being taken out power device, battery still can be caused to cross to put and scrap.
The solution of prior art is that also timing is charged to rechargeable battery when not using for a long time, crosses put to prevent rechargeable battery, thus causes the use inconvenience of user.
Summary of the invention
In view of the above problems, the present invention is proposed to provide a kind of overcoming the problems referred to above or the battery protecting circuit solved the problem at least in part, electric energy generator and electronic installation.
The present invention's further object is scrapped after preventing rechargeable battery from shelving for a long time.
Another further object of the present invention makes the setting of the Protection parameters of battery protecting circuit more flexible.
Another further object of the present invention saves the power management cost of outside consuming parts.
According to an aspect of the present invention, the invention provides a kind of battery protecting circuit.This battery protecting circuit, be external in battery, comprise for providing protecting control signal to be battery protection chip for battery, battery protection chip at least has chip positive supply input pin, battery protecting circuit also comprises further: chip controls switch, be arranged between chip positive supply input pin and the positive pole of battery, and be configured to controllably be in conducting state or off state; And under chip controls switch is in conducting state; chip positive supply input pin is communicated with the positive pole of battery; make battery protection chip work; under chip controls switch is in off state; connection between the chip positive supply input pin of battery protection chip and the positive pole of battery disconnects, and battery protection chip is quit work.
Alternatively, chip controls switch is electronic switch, comprising: the first link, is configured to be connected with the positive pole of battery, the second link, is configured to be connected with the chip positive supply input pin of battery protection chip; And control end, be configured to use signal from external reception battery, and conducting or the connection between shutoff the first link and the second link use the control of signal at battery under.
Alternatively, chip controls switch comprises: a P channel MOS tube, and its source electrode is used as the first link of chip controls switch, and its drain electrode is used as the second link of chip controls switch, and its grid is used as the control end of chip controls switch; With the first pull-up resistor, between the control end being connected to chip controls switch and the positive pole of battery.
Alternatively, above-mentioned battery protecting circuit comprises further: cathode output end and cathode output end, for outwards exporting the electric energy of battery.
Alternatively, battery protection chip also has control of discharge pin; Battery protection chip is operationally configured to further: when the operating voltage that chip positive supply input pin gets is less than or equal to predetermined overdischarge pressure threshold value; the the first protecting control signal preventing from described battery from crossing putting is exported by control of discharge pin; and/or when the discharging current of battery is more than or equal to default discharging current threshold, exported the second protecting control signal preventing battery overcurrent by control of discharge pin.
Alternatively, above-mentioned battery protecting circuit also comprises: discharge control switch, is connected between the positive pole of battery and cathode output end, and is configured to according to the first protecting control signal or the positive pole of the second protecting control signal cut battery and the connection of cathode output end.
Alternatively; discharge control switch comprises: the first link; be configured to be connected with the positive pole of battery; second link; be configured to be connected with cathode output end; and control end, be configured to be connected with control of discharge pin, and turn off the connection between the first link of discharge control switch and the second link of discharge control switch by the first protecting control signal of receiving or the second protecting control signal.
Alternatively, discharge control switch comprises: the 2nd P channel MOS tube, and its source electrode is used as the first link of discharge control switch, and its drain electrode is used as the second link of discharge control switch; N-channel MOS pipe, its grid is used as the control end of discharge control switch, the grid of its drain electrode connection the 2nd P channel MOS tube, and its source electrode is configured to be connected with cathode output end; Second pull-up resistor, is connected between the positive pole of battery and the drain electrode of N-channel MOS pipe.
Alternatively, above-mentioned battery protecting circuit also comprises: current detecting part, is connected between the negative pole of described battery and described cathode output end, and is configured to the discharging current size detecting battery; Battery protection chip also has electric current induction input pin, and electric current induction input pin is connected with current detecting part.
Alternatively, current detecting part comprises: sampling resistor, and one end is connected to the negative pole of battery, and the other end is configured to connect cathode output end; And electric current induction input pin is connected with cathode output end, with the discharging current size by the voltage drop detection battery on sampling resistor.
Alternatively, current detecting part also comprises: current-limiting resistance, is serially connected with cathode output end and electric current is responded between input pin; And capacitor, in parallel with current-limiting resistance.
Alternatively, battery protection chip also has charging and controls pin, and charging controls the unsettled setting of pin.
According to another aspect of the present invention, a kind of electric energy generator is additionally provided.This electric energy generator comprises: battery; Be external in any one battery protecting circuit as introduced above of battery, configuration battery pair provides protecting control signal, and controllably outwards exports the electric energy of battery by its cathode output end and cathode output end.
Alternatively, battery is Li-Ion rechargeable battery.
According to another aspect of the present invention, a kind of electronic installation is additionally provided.This electronic installation comprises consuming parts, and comprises further: above-mentioned electric energy generator, is configured to controllably provide electric energy to consuming parts.
Alternatively, above-mentioned electronic installation also comprises: power consumption control device, and being configured to provides battery to use signal to the chip controls switch in electric energy generator, makes chip controls switch controllably be in conducting state or off state.
Battery protecting circuit of the present invention; by arranging chip controls switch between the chip positive supply input pin and the positive pole of battery of battery protection chip; when battery does not work; electrical connection between chip positive supply input pin and the positive pole of battery is disconnected; cut off the power supply to battery protection chip; avoid the battery caused due to the faint power consumption of battery protection chip to cross and put, extend the useful life of battery, avoid cell damage.
In addition; battery protecting circuit of the present invention; discharge control switch is arranged between the positive pole of battery and cathode output end mouth; when battery is not powered; discharge control switch remains open; the electrical connection of just battery and external circuit can disconnect, avoid outside consuming parts and special electric power management circuit is set, save power management cost.
In addition; battery protecting circuit of the present invention; its current detecting part is arranged between the negative pole of battery and the ground wire of consuming parts; detected parameters can be adjustable flexibly; only need the resistance by changing its sampling resistor; just can adjust discharging current threshold, improve the flexibility of battery protecting circuit.
In addition; because current rechargeable battery is substantially all provided with charging IC (Integrated Circuit; integrated circuit); the size of charging current can be controlled completely by charging IC; and prevent from overcharging, therefore, battery protecting circuit of the present invention; eliminate over-charge protective, avoid the Redundancy Design of circuit.
In addition; battery protecting circuit of the present invention; independently arrange with battery; go in the non-removable electric energy generator of battery and electronic equipment; only start when needs are powered; and directly can cut off the electrical connection of battery and consuming parts, when not using battery, completely avoid the power consumption of battery.
According to hereafter by reference to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will understand above-mentioned and other objects, advantage and feature of the present invention more.
Accompanying drawing explanation
Hereinafter describe specific embodiments more of the present invention with reference to the accompanying drawings by way of example, and not by way of limitation in detail.Reference numeral identical in accompanying drawing denotes same or similar parts or part.In the accompanying drawings:
Fig. 1 is the circuit theory diagrams of prior art battery protecting circuit;
Fig. 2 is the schematic block diagram of battery protecting circuit according to an embodiment of the invention; And
Fig. 3 is the circuit theory diagrams of battery protecting circuit according to an embodiment of the invention.
Embodiment
Battery for prior art is placed for a long time and is caused reduce the problem even damaged useful life; through analysis and the test of inventor; find that its main cause is the faint power consumption accumulation that battery protecting circuit leaves unused in process at battery; in order to address this problem, the present embodiment provide firstly a kind of battery protecting circuit.Fig. 2 is the schematic block diagram of battery protecting circuit according to an embodiment of the invention, as shown in the figure, this battery protecting circuit includes battery protection chip 120 and chip controls switch 110 in general manner, wherein battery protection chip 120 is for providing various protecting control signal (such as Cross prevention signal and overcurrent protection signal) for battery 100, battery protection chip 120 can be selected according to the voltage of battery and power reguirements, it is 2.0V to 3.0V that the S-8241 family chip of the Seiko such as, mentioned in background technology just provides overdischarge pressure threshold value, advanced unit is the various chips of 100mV, and the overdischarge pressure threshold value of DW01+ chip is 2.3V.These battery protection chips 120 at least have chip positive supply input pin Vdd.The power supply of battery protection chip 120 is inputted by chip positive supply input pin Vdd, and when chip positive supply input pin Vdd non-transformer inputs, battery protection chip 120 quits work.
Chip controls switch 110 is arranged between chip positive supply input pin Vdd and the positive pole of battery 100, and this chip controls switch 110 can controllably be in conducting state or off state.The negative supply input pin Vss of battery protection chip 120 is connected with the negative pole of battery 100.
The battery protecting circuit of the present embodiment is optionally arranged in the outside of battery; the battery that namely battery protecting circuit and this battery protecting circuit are protected independently is arranged; battery protecting circuit can be external in battery by interface; be convenient to chip controls switch 110 and obtain battery use signal from outside; and controllably conducting and closedown, meet the requirement that battery is fixedly installed on electronic installation inside.
When chip controls switch 110 is in conducting state; the chip positive supply input pin Vdd of battery protection chip 120 is communicated to the positive pole of battery 100; for battery protection chip 120 input service power supply, battery protection chip 120 works, and puts, the guard signal such as overcurrent for battery 100 provides.When chip controls switch 110 is in off state; connection between the chip positive supply input pin Vdd of battery protection chip 120 and the positive pole of battery 100 disconnects; chip positive supply input pin Vdd non-transformer inputs; battery protection chip 120 is quit work; therefore, any consumption can not be caused to the electric energy of battery 100.
The power consumption long term accumulation that battery protection chip 120 is faint, can cause battery to be crossed and put, and causes battery shortening even to damage battery further.And the battery protecting circuit using the present embodiment to provide; when battery does not work; disconnect the connection of battery protection chip 120 positive supply input pin Vdd and battery 100 positive pole; battery protection chip 120 is made to stop power consumption; thus make battery 100 keep electricity; when battery 100 does not use for a long time, the useful life of battery can not be affected because excessively putting.
In a kind of embodiment, chip controls switch 110 can select electronic switch, and this electronic switch can select the controllable semiconductor device such as metal-oxide-semiconductor, transistor, and it at least includes: the first link, the second link and control end.
First link of chip controls switch 110 is connected with the positive pole of battery 100, and the second link of chip controls switch 110 is connected with the chip positive supply input pin Vdd of battery protection chip 120.The signal controlling that the turn-on and turn-off state of the first link and the second link is received by the control end of chip controls switch 110.
The control end of chip controls switch 110 can receive battery from external control port EN and use signal.When receiving the battery use signal that startup battery is outwards powered; first link of control end control chip control switch 110 of chip controls switch 110 is communicated with the second link of chip controls switch 110; the chip positive supply input pin Vdd of battery protection chip 120 is made to connect the positive pole of battery 100; battery protection chip 120 is powered, and starts to perform defencive function.This battery uses signal can link with the starting-up signal of external circuit, and such as user generates the battery use signal starting battery and outwards power simultaneously when starting shooting, battery 100 is powered to battery protection chip 120, and battery protection chip 120 is started working.
The control end of chip controls switch 110 receive stop the battery battery of outwards powering to use signal or do not receive battery use signal time, keep chip control switch 110 to be in off state, to avoid battery protection chip 120 power consumption.
In an Alternate embodiments of the present embodiment, the discharge prevention part of battery protection chip 120 is improved.As shown in Figure 2, be also provided with in battery protecting circuit: cathode output end P+ and cathode output end P-, outwards to export the electric energy of described battery.Wherein cathode output end P+ is used for the power line positive pole of battery 100 being connected to power consumption equipment, and cathode output end P-is used for the ground wire negative pole of battery 100 being connected to power consumption equipment.
Battery 100 discharge voltage can also be detected by the chip positive supply input pin Vdd of battery protection chip 120.In the case, the voltage between the chip positive supply input pin Vdd of battery protection chip 120 and chip negative supply input pin Vss can think battery 100 discharge voltage.
The control of discharge pin Dout of battery protection chip 120 can according to the discharge condition output protection signal of battery 100.Such as; the control of discharge pin Dout of battery protection chip 120, when the operating voltage that chip positive supply input pin Vdd gets is less than or equal to predetermined overdischarge pressure threshold value, exports the first protecting control signal (i.e. Cross prevention control signal) preventing from described battery from crossing putting.As previously mentioned, above overdischarge pressure threshold value is determined by the model of battery protection chip 120.
Again such as, the control of discharge pin Dout of battery protection chip 120 when the discharging current of battery is more than or equal to default discharging current threshold, can also export the second protecting control signal (i.e. overcurrent protection control signal) preventing battery overcurrent.
Therefore, the control of discharge pin Dout of battery protection chip 120 when battery discharge occurs abnormal, can export Cross prevention control signal and overcurrent protection control signal.
In an alternative of the embodiment of the present invention, as shown in Figure 2, battery protecting circuit can also arrange discharge control switch 130.This discharge control switch 130 is connected between the positive pole of battery and cathode output end P+, and is configured to the Cross prevention control signal that exports according to control of discharge pin Dout or overcurrent protection control signal cuts off the positive pole of battery 100 and the connection of cathode output end P+.That is, in this alternative, when battery discharge occurs abnormal, discharge control switch 130 disconnects and makes battery 100 stop externally powering, and achieves the protection to battery 100.
The above-mentioned embodiment of the present invention compared with prior art, discharge control switch 130 is arranged between the positive pole of battery 100 and the cathode output end P+ outwards powered, its be in cut-off state time, directly the positive pole of battery 100 and the connection of outside consuming parts are cut off, and repeat to arrange electric power management circuit without the need to outside consuming parts, save the cost of power management.
In above-mentioned embodiment, the control logic of battery protection chip 120 is: after positive supply input pin Vdd is communicated with battery 100 positive pole, enter operating state, its control of discharge pin Dout input control signal makes discharge control switch 130 be communicated with, anode 100 is made to be communicated with cathode output end P+, with normal outwards power supply, when battery 100 overcurrent being detected or excessively putting, control of discharge pin Dout input protection control signal makes discharge control switch 130 disconnect, directly cut off the electricity supply and 100 to be connected with connection cathode output end P+, achieve the defencive function to battery 100.
Alternatively, discharge control switch 130 can comprise the first link, the second link and control end in general manner.First link of discharge control switch 130 is connected with the positive pole of battery 100, and the second link of discharge control switch 130 is connected with cathode output end P+, and the control end of discharge control switch 130 is connected with control of discharge pin Dout.The control end of discharge control switch 130 is in conducting state or off state according between the first link of the signal controlling discharge control switch 130 received and the second control end; and when the control end of discharge control switch 130 receives Cross prevention control signal or overcurrent protection control signal, the first link of discharge control switch 130 and the second control end are controlled to keep off state.
When chip controls switch 110 turns off; the positive supply input pin Vdd of battery protection chip 120 is without input; battery protection chip 120 quits work, and the signal that the control end of discharge control switch 130 receives keeps discharge control switch 130 to disconnect, and exports with all power supplies cutting off battery 100.
In an optional battery protective circuit of the present embodiment, can also increase and current detecting part 140 is set.This current detecting part 140 can detect the discharging current size of battery 100, and provides the voltage signal corresponding with discharging current size to the electric current induction input pipe Vm of battery protection chip 120.In the battery protecting circuit shown in Fig. 2; current detecting part 140 is connected between the negative pole of battery 100 and cathode output end P-; and the size of discharging current is converted to corresponding voltage signal; be supplied to electric current induction input pin Vm, judge battery 100 whether overcurrent for battery protection chip 120.
Carry out compared with discharging current detects with utilizing the conduction voltage drop of metal-oxide-semiconductor in prior art; the electric current of the current detecting part 140 of the present embodiment and the proportionate relationship of voltage adjustable; thus the discharging current threshold of battery 100 can be adjusted, improve the flexibility of battery protection.
Fig. 3 is the circuit theory diagrams of the battery protecting circuit according to the present invention's embodiment; in these optional circuit theory diagrams; the cathode circuit symbol of battery 100 is designated as VBAT; chip U1 is as battery protection chip 120; first pin of chip U1 is control of discharge pin Dout, and the second pin is electric current induction input pipe Vm, and three-prong is charging control pin Cout; 5th pin is positive supply input pin Vdd, and the 6th pin is negative supply input pin Vss.Negative supply input pin Vss is connected with the negative pole of battery 100.
First electric capacity C1, as decoupling capacitor, is parallel to the two ends of battery 100, with filtering ripple, keeps voltage stabilization.One P channel MOS tube Q1 and the first pull-up resistor R1 compositing chip control switch 110, the source electrode of Q1 is used as the first link of chip controls switch 110, the drain electrode of Q1 is used as the second link of chip controls switch 110, and the grid of Q1 is used as the control end of chip controls switch 110.R1 is connected between the control end of chip controls switch 110 and the positive pole of battery 100.
When battery 100 is not in discharge condition, the input of external control port EN no signal or input high level signal.Due to the pull-up effect of the first pull-up resistor R1, the grid of Q1 is high level, and the drain electrode of Q1 and source electrode disconnect.Positive supply input pin Vdd non-transformer inputs, and U1 quits work, thus any electric energy of not consuming cells 100.
When battery 100 is outwards powered, external control port EN receives low level battery and uses signal (this low level battery uses signal can be provided by external electronic device or provided by a ground connection hand switch), Q1 conducting, the drain electrode of Q1 is communicated with source electrode, positive supply input pin Vdd is connected to VBAT, and chip U1 works on power.When battery 100 is in discharge condition, need to keep external control port EN to maintain low level.
In the circuit theory diagrams shown in Fig. 3, the 2nd P channel MOS tube Q3, N-channel MOS pipe Q2 and the second pull-up resistor R4 form discharge control switch 130.The source electrode of Q3 is used as the first link of discharge control switch 130, connects the positive pole VBAT of battery 100, and the drain electrode of Q3 is used as the second link of discharge control switch 130, connects cathode output end P+.The grid of Q2 is used as the control end of discharge control switch 130, connects the control of discharge pin Dout of chip U1.The drain electrode of Q2 connects the grid of Q3, and the source electrode of Q2 connects cathode output end P-.R4 is connected between the drain electrode of positive pole VBAT and Q2 of battery 100.
When battery 100 is not outwards powered, the control of discharge pin Dout no-output of chip U1, due to the pull-up effect of R4, keeps the source electrode of Q3 and grid to disconnect.Thus make to remain open between the positive pole VBAT of battery 100 and cathode output end P+, ensure that battery 100 is without any power consumption.And then making under the non-discharged state of battery 100, the positive pole of battery 100 is electrically connected without any with external circuit.
When the outside normal power supply of battery 100, the control of discharge pin Dout of chip U1 exports high level, and Q2 conducting, its source electrode and drain electrode are in conducting state.Thus the source electrode of Q2 is dragged down, make Q3 conducting.Keep conducting between the positive pole VBAT of battery 100 and cathode output end P+, battery 100 can be made outwards to power.
In power supply process, the positive supply input pin Vdd if there is chip U1 detects the situation of the voltage of VBAT lower than the overdischarge pressure threshold value preset, and the control of discharge pin Dout output low level of chip U1, source electrode and the drain electrode of Q2 are in off state.Due to the pull-up effect of R4, source electrode and the grid of Q3 are in off-state, thus the positive pole VBAT of battery 100 and cathode output end P+ disconnects, and have cut off battery 100 positive pole and outside electrical connection, have achieved the Cross prevention function to battery 100.
In the circuit theory diagrams shown in Fig. 3, sampling resistor R2, current-limiting resistance R3, capacitor C2 constitute current detecting part 140.One end of sampling resistor R2 is connected to the negative pole of battery, and the other end connects cathode output end P-.The electric current that battery 100 negative pole flows into causes R2 produces pressure drop.Chip U1 by detecting the pressure reduction of Vm pin and Vss pin, thus can determine the discharging current of battery 100.When pressure reduction exceedes the predetermined overcurrent detection voltage threshold of chip U1, chip U1 starts overcurrent protection, its control of discharge pin Dout output low level, and source electrode and the drain electrode of Q2 turn off.And utilize the pull-up effect of R4 to disconnect source electrode and the grid of Q3, the positive pole VBAT of battery 100 and cathode output end P+ is disconnected, cut off battery 100 positive pole and outside electrical connection, achieved the overcurrent protection function to battery 100.
The electric current that current-limiting resistance R3 is serially connected with cathode output end P-and chip U1 is responded between input pin Vm, and capacitor C2 and R3 is in parallel, and impulse current during fault can be avoided to cause U1 to damage, and improves the reliability of chip U1.
Because the predetermined overcurrent detection voltage threshold of chip U1 is fixed value, in prior art, the conduction voltage drop of metal-oxide-semiconductor is uncontrollable, and the discharging current threshold of chip U1 is nonadjustable.And in the battery protecting circuit of the present embodiment, just can adjust discharging current threshold by the resistance changing sampling resistor R2, improve the flexibility of battery protecting circuit.
In addition, because current rechargeable battery is substantially all provided with charging IC (integrated circuit), the size of charging current can be controlled completely by charging IC, and prevent from overcharging, therefore, in order to avoid Redundancy Design, the charging of embodiment of the present invention chips controls pin Cout and can be set to unsettled.
Battery protecting circuit is external in battery 100, and both can independently be arranged, and are electrically connected by circuit interface.Under this setup; compared with the inner integrated protective circuit of rechargeable battery in prior art; in the present embodiment, battery 100 only integratedly can be provided with battery core; it is outside that battery protecting circuit is arranged at battery 100, is convenient to battery protecting circuit and receives low level battery use signal from external control port EN.
Circuit theory diagrams shown in Fig. 3 are only example; during practical application, in circuit, each parts can select the identical parts of other control logics to replace; such as P channel MOS tube can use PNP transistor to replace; N-channel MOS pipe can use NPN transistor to replace, and the battery that can protect as required of physical circuit parameter and device and use the power consumption characteristics of this battery powered consuming parts to select flexibly.
The present embodiment additionally provides a kind of electric energy generator, comprises any one battery protecting circuit introduced in protected battery 100 and above-described embodiment.Battery protecting circuit and battery 100 can separate settings being electrically connected.This electric energy generator when battery is in idle condition, can avoid the power consumption that battery is all, battery is placed for a long time, still can keep original energy state, improve the useful life of battery.And electric energy generator controllably outwards exports the electric energy of battery by its cathode output end and cathode output end, ensure the electric discharge safety of battery.
This electric energy generator at least possesses two outputs and an input.The cathode output end P+ of two outputs and battery protecting circuit and cathode output end P-, outwards controllably to power.An input is external control port EN, uses signal to obtain battery.
Battery 100 in the electric energy generator of the present embodiment can use Li-Ion rechargeable battery, making full use of that its specific energy is large, while the advantage that has extended cycle life, avoids putting the damage caused with overcurrent.
Further, the embodiment of the present invention additionally provides a kind of electronic equipment.This electronic equipment includes consuming parts, and uses the electric energy generator of above embodiment controllably to power to consuming parts.The cathode output end P+ of battery protecting circuit can connect the power line of consuming parts, and the cathode output end P-of battery protecting circuit can connect the ground wire of consuming parts.
This electronic equipment preferably can use the structure of non-dismountable battery.To utilize space more easily, make electronic equipment when using same battery capacity, more frivolous, globality is better.And due to electric energy generator and consuming parts Integral design, the corresponding generation of the starting-up signal of consuming parts can be utilized and provide battery to use signal.
The electronic equipment of the present embodiment arranges power consumption control device further, and this power consumption control device provides battery to use signal to the external control port EN of battery protecting circuit, makes chip controls switch 110 controllably conducting or shutoff.This power consumption control device can be hand switch, sends low level battery use signal according to the power-on operation of user.In another embodiment, power consumption control device can link with the starting-up signal of consuming parts.
When consuming parts is closed, power consumption control device no-output or output high level, can realize zero power consumption of battery in non-powered state.When consuming parts is opened, power consumption control device output low level, makes battery protection chip start working, and battery can reliably be protected under power supply state.
Utilize the battery protecting circuit in above embodiment, electric energy generator and electronic equipment, realize the defencive function under battery-powered state simultaneously, the power consumption also can battery protection chip being avoided when battery leaves unused faint.Thus battery is under long-time state on the shelf, still can ensure original state of charge, avoids and cause battery shortening even to be scrapped owing to crossing to put.
So far, those skilled in the art will recognize that, although multiple exemplary embodiment of the present invention is illustrate and described herein detailed, but, without departing from the spirit and scope of the present invention, still can directly determine or derive other modification many or amendment of meeting the principle of the invention according to content disclosed by the invention.Therefore, scope of the present invention should be understood and regard as and cover all these other modification or amendments.
Claims (16)
1. a battery protecting circuit, is external in battery, and comprise the battery protection chip for providing protecting control signal for described battery, described battery protection chip at least has chip positive supply input pin, it is characterized in that described battery protecting circuit also comprises:
Chip controls switch, is arranged between described chip positive supply input pin and the positive pole of described battery, and is configured to controllably be in conducting state or off state; And
Under described chip controls switch is in conducting state, described chip positive supply input pin is communicated with the positive pole of described battery, makes described battery protection chip work,
Under described chip controls switch is in off state, the connection between described chip positive supply input pin and the positive pole of described battery disconnects, and described battery protection chip is quit work.
2. battery protecting circuit according to claim 1, is characterized in that described chip controls switch is electronic switch, comprising:
First link, is configured to be connected with the positive pole of described battery;
Second link, is configured to be connected with the chip positive supply input pin of described battery protection chip; With
Control end, is configured to use signal from external reception battery, and conducting or the connection that turns off between described first link and described second link use the control of signal at described battery under.
3. battery protecting circuit according to claim 2, is characterized in that described chip controls switch comprises:
One P channel MOS tube, its source electrode is used as the first link of described chip controls switch, and its drain electrode is used as the second link of described chip controls switch, and its grid is used as the control end of described chip controls switch; With
First pull-up resistor, between the control end being connected to described chip controls switch and the positive pole of described battery.
4. battery protecting circuit according to any one of claim 1 to 3, characterized by further comprising:
Cathode output end and cathode output end, for outwards exporting the electric energy of described battery.
5. battery protecting circuit according to claim 4, is characterized in that
Described battery protection chip also has control of discharge pin;
Described battery protection chip is operationally configured to further:
When the operating voltage that described chip positive supply input pin gets is less than or equal to predetermined overdischarge pressure threshold value, exported the first protecting control signal preventing from described battery from crossing putting by described control of discharge pin; And/or
Exported the second protecting control signal preventing described battery overcurrent by described control of discharge pin when the discharging current of described battery is more than or equal to default discharging current threshold.
6. battery protecting circuit according to claim 5, characterized by further comprising:
Discharge control switch, is connected between the positive pole of described battery and described cathode output end, and is configured to the positive pole of battery and the connection of described cathode output end according to described first protecting control signal or described second protecting control signal cut.
7., according to the battery protecting circuit described in claim 6, it is characterized in that described discharge control switch comprises:
First link, is configured to be connected with the positive pole of described battery,
Second link, is configured to be connected with described cathode output end, and
Control end; be configured to be connected with described control of discharge pin, and turn off the connection between the first link of described discharge control switch and the second link of described discharge control switch by the described first protecting control signal that receives or described second protecting control signal.
8. battery protecting circuit according to claim 7, is characterized in that described discharge control switch comprises:
2nd P channel MOS tube, its source electrode is used as the first link of described discharge control switch, and its drain electrode is used as the second link of described discharge control switch;
N-channel MOS pipe, its grid is used as the control end of described discharge control switch, and its drain electrode connects the grid of described 2nd P channel MOS tube, and its source electrode is configured to be connected with described cathode output end;
Second pull-up resistor, is connected between the positive pole of described battery and the drain electrode of described N-channel MOS pipe.
9. battery protecting circuit according to claim 5, is characterized in that
Described battery protecting circuit also comprises: current detecting part, is connected between the negative pole of described battery and described cathode output end, and is configured to the discharging current size detecting described battery;
Described battery protection chip also has electric current induction input pin, and described electric current induction input pin is connected with described current detecting part.
10. battery protecting circuit according to claim 9, is characterized in that
Described current detecting part comprises: sampling resistor, and one end is connected to the negative pole of described battery, and the other end is configured to connect described cathode output end; And
Described electric current induction input pin is connected with described cathode output end, with the discharging current size by battery described in the voltage drop detection on described sampling resistor.
11. battery protecting circuits according to claim 10, is characterized in that described current detecting part also comprises:
Current-limiting resistance, is serially connected with described cathode output end and described electric current is responded between input pin; With
Capacitor, in parallel with described current-limiting resistance.
12. battery protecting circuits according to claim 1, is characterized in that
Described battery protection chip also has charging and controls pin, and described charging controls the unsettled setting of pin.
13. 1 kinds of electric energy generators, is characterized in that comprising:
Battery; With
Be external in the battery protecting circuit according to any one of claim 1 to 12 of described battery, be configured to provide protecting control signal to described battery, and controllably outwards export the electric energy of described battery by its cathode output end and cathode output end.
14. electric energy generators according to claim 13, is characterized in that
Described battery is Li-Ion rechargeable battery.
15. 1 kinds of electronic installations, comprise consuming parts, characterized by further comprising:
Electric energy generator according to claim 13 or 14, is configured to controllably provide electric energy to described consuming parts.
16. electronic installations according to claim 15, characterized by further comprising:
Power consumption control device, is configured to provide battery to use signal to the chip controls switch in described electric energy generator, makes described chip controls switch controllably be in conducting state or off state.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047589.5A CN104600676B (en) | 2015-01-29 | 2015-01-29 | Battery protecting circuit, electric energy provide device and electronic installation |
| HK15106228.4A HK1205826A1 (en) | 2015-01-29 | 2015-06-30 | Battery protection circuit, electric energy supply device and electronic device |
| PCT/CN2016/072276 WO2016119694A1 (en) | 2015-01-29 | 2016-01-27 | Battery protection circuit, electrical energy providing device and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047589.5A CN104600676B (en) | 2015-01-29 | 2015-01-29 | Battery protecting circuit, electric energy provide device and electronic installation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104600676A true CN104600676A (en) | 2015-05-06 |
| CN104600676B CN104600676B (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510047589.5A Active CN104600676B (en) | 2015-01-29 | 2015-01-29 | Battery protecting circuit, electric energy provide device and electronic installation |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN104600676B (en) |
| HK (1) | HK1205826A1 (en) |
| WO (1) | WO2016119694A1 (en) |
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| CN111668563B (en) * | 2020-06-17 | 2023-08-01 | 东莞新能安科技有限公司 | Electrochemical device and control method thereof |
| CN114243806A (en) * | 2020-09-09 | 2022-03-25 | 高创(苏州)电子有限公司 | Battery charge-discharge control system and electronic equipment |
| CN114256954A (en) * | 2020-09-22 | 2022-03-29 | 海能达通信股份有限公司 | Control circuit and battery |
| WO2022061516A1 (en) * | 2020-09-22 | 2022-03-31 | 海能达通信股份有限公司 | Control circuit and battery |
| CN112688426A (en) * | 2020-12-15 | 2021-04-20 | 重庆电子工程职业学院 | Timing monitoring circuit for Internet of things |
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| CN112751384A (en) * | 2020-12-30 | 2021-05-04 | 珠海冠宇电源有限公司 | Control method of electronic equipment and electronic equipment |
| CN112751384B (en) * | 2020-12-30 | 2024-03-26 | 珠海冠宇电源有限公司 | Electronic equipment control method and electronic equipment |
| WO2023160235A1 (en) * | 2022-02-25 | 2023-08-31 | 荣耀终端有限公司 | Over-discharge protection circuit, battery protection board, and electronic device |
| CN115085144A (en) * | 2022-07-15 | 2022-09-20 | 力高(山东)新能源技术有限公司 | Power supply output overcurrent protection circuit and method based on current detection |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016119694A1 (en) | 2016-08-04 |
| CN104600676B (en) | 2018-02-16 |
| HK1205826A1 (en) | 2015-12-24 |
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