CN101212135B

CN101212135B - Battery protection circuit and battery using the same

Info

Publication number: CN101212135B
Application number: CN2006101577651A
Authority: CN
Inventors: 王冰; 马肇鸿
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2006-12-27
Filing date: 2006-12-27
Publication date: 2011-07-27
Anticipated expiration: 2026-12-27
Also published as: CN101212135A

Abstract

The invention relates to a battery protection circuit used for controlling power supply to a system by the battery. The battery protection circuit comprises a sensing circuit and a control circuit. The sensing circuit comprises a triaxial acceleration gauge which is used for sensing the position changes when the battery is in an unstable state. The output voltage of three output ends of an Axis X, an Axis Y and an Axis Z in the triaxial acceleration gauge change with the position changes of the battery. The output voltage of the three output ends of Axis X, the Axis Y and the Axis Z in the triaxial acceleration gauge at last generate control voltage to the control circuit. When the battery is in the unstable state, the control voltage switches off the control circuit to prevent the battery from realizing power supply to the system. When the battery is in a stable state, the control voltage switches on the control circuit to lead that the battery canot realize to supply the power to the system, thus achieving the aim of avoiding the generated electrical spark due to the power supply to the system with an unstable contact when mounting or dismounting the battery.

Description

Battery protecting circuit and adopt the battery of this protective circuit

Technical field

The present invention relates to a kind of battery protecting circuit, particularly relates to a kind of battery that produces the battery protecting circuit of electric spark when battery is installed and adopt this protective circuit of eliminating.

Background technology

Each electronic product, for example notebook computer (Notebook Computer), plate computer (TabletComputer) etc. all need the power supply of direct current as electronic product in use.For avoiding using the limitation of electricity consumption, cause the scope of application, impeding of electric wire and influence the convenience of use, way commonly used adopts battery powered mode exactly.

In recent years, with the notebook computer is example, because advancing by leaps and bounds of computer technology, also make CPU (CPU) and Video Graphics Array (Video Graphics Array, VGA) usefulness is able to continuous lifting, constantly perfect along with function also impels people that its peripheral element is more and more paid attention to.Along with the improvement to battery material, prolong its useful life, uses battery to become many a kind of supply power modes that the personage liked of often going out more.Yet; battery is being installed on notebook computer or is placing the process of charger charging plug; hear trickle Pi sound or see spark through regular meeting; this is time contact instability generation owing to powered battery; may produce not only that Keep Clear-High Voltage; even cause the burning of battery and electronic product, thereby become the hidden danger that battery uses.

Therefore, if can provide a kind of when avoiding being installed on electronic product or with charger plug process in produce the battery of electric spark, can not only improve the useful life of battery and electronic product, the user of electronic product also can be in order to avoid be perplexed by hidden danger when using.

Summary of the invention

In view of this, be necessary in fact to provide a kind of battery protecting circuit and a kind of battery that adopts this protective circuit of generation electric spark when eliminating installations/plug.

A kind of battery protecting circuit; be used to control the power supply of battery to system; this battery protecting circuit comprises a sensing circuit and a control circuit; this sensing circuit comprises that one three are quickened rule; these three variations of quickening rule position when being used for the sensing battery and being in unsteady state; and these three X-axis of quickening rule; Y-axis; the output voltage of three outputs of Z axle changes with the change in location of battery; this sensing circuit is according to three X-axis of quickening rule; Y-axis; the last control voltage that produces of the output voltage of three outputs of Z axle is to described control circuit; when battery is in unsteady state; this control voltage is closed this control circuit and battery can not be realized this system's power supply; when battery was in stable state, this control voltage was opened this control circuit and battery is realized this system's power supply.

A kind of battery is used for the power supply to system, is integrated with above-mentioned battery protecting circuit in this battery.

Compared with prior art, the variation of displacement when battery is made non-uniform movement in installation process by three in this sensing circuit acceleration rule sensing batteries, and export specific control voltage to control circuit, control the open and close of switch in this control circuit, thereby whether the control battery powers to system, reach when eliminating battery installation or dismounting because of contacting the purpose that instability produces electric spark, the fail safe of assurance system, make the application of battery more safe and reliable, the useful life of increase system and battery.

Description of drawings

With reference to the accompanying drawings, in conjunction with the embodiments the present invention is further described.

Fig. 1 is the circuit function calcspar of battery protecting circuit of the present invention.

Fig. 2 is the wherein circuit diagram of an embodiment in voltage of voltage regulation source in the battery protecting circuit of the present invention.

Fig. 3 is the wherein circuit diagram of an embodiment that battery protecting circuit of the present invention is removed voltage of voltage regulation source part.

Embodiment

The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.

The invention provides a kind of battery protecting circuit, can be applicable on the battery of electronic products such as notebook computer, plate computer, this battery protecting circuit is integrated on the battery, thereby the electronic product that uses this battery is had compatibility.Fig. 1 is the circuit function calcspar of battery protecting circuit of the present invention, this battery protecting circuit be connected in battery 100 and the system 150 that constitutes by electronic product between, comprise a voltage of voltage regulation source 10, a sensing circuit 20, a control circuit 30 and a feedback circuit 40.Wherein, system 150 can be above-mentioned each electronic product of mentioning.

As shown in Figure 2, this voltage of voltage regulation source 10 comprises some outputs 161,162,163,164,165, to export different magnitudes of voltage respectively, this voltage of voltage regulation source 10 is made up of formed battery pack 12 of the battery of some serial or parallel connections and several dividing circuit, and bleeder circuit comprises by two resistance R 1 among this embodiment, first bleeder circuit 141 that the R2 series connection forms, by two resistance R 3, second bleeder circuit 142 that the R4 series connection forms, by two resistance R 5, the 3rd bleeder circuit 143 that the R6 series connection forms, by two resistance R 7, the 4th bleeder circuit 144 that the R8 series connection forms reaches by two resistance R 9, the 5th bleeder circuit 145 that the R10 series connection forms.First bleeder circuit 141 is connected with battery pack 12 by node 1411, second bleeder circuit 142, the 3rd bleeder circuit 143, the 4th bleeder circuit 144 and the 5th bleeder circuit 145 are all parallel with one another with resistance R 2, promptly be connected between the node 1421,1422 at R2 two ends, wherein node 1422 links to each other with the earth polar.Output 161,162,163,164,165 respectively from bleeder circuit 141,142,143,144, draw between 145 two resistance, promptly first output 161 is from two resistance R 1 of first bleeder circuit 141, (being node 1421 places) draws between the R2, second output 162 is from two resistance R 3 of second bleeder circuit 142, draw between the R4, the 3rd output 163 is from two resistance R 5 of the 3rd bleeder circuit 143, draw between the R6, the 4th output 164 is from two resistance R 7 of the 4th bleeder circuit 144, draw between the R8, the 5th output 165 is from two resistance R 9 of the 5th bleeder circuit 145, draw between the R10.Battery pack 12 provides voltage to each bleeder circuit 141,142,143,144,145, by regulating the size of resistance R 1, R2, R3, R4, R5, R6, R7, R8, R9, R10 in each bleeder circuit 141,142,143,144,145, reach the size of the output voltage on each output 161,162,163,164,165 of control.

As shown in Figure 3, this sensing circuit 20 comprises that one three are quickened rule 22, one comparison circuit 24 and a selection circuit 26.These three acceleration rule 22 bodies produce when moving or rotating, and the CMOS of its internal structure (Complementary Metal-Oxide Semiconductor) micro-structural generation displacement causes the variation of capacitance, is converted to specific output voltage signal again.These the three switch pin position V that quicken rule 22 _DdBe connected to first output 161 in voltage of voltage regulation source 10 by resistance R 45.In the present embodiment, suppose that these three are quickened rule 22 required cut-in voltage sizes and are 5V, provide by first output 161 in voltage of voltage regulation source 10.When battery 100 produces mobile or tilts, three are quickened rule 22 along with battery 100 moves or inclination together, its X-axis, Y-axis, three on Z axle are exported the correspondent voltage value respectively to comparison circuit 24, according to these three output characteristic of quickening rule 22, with three quicken rule 22 horizontal positioned stable after, the output voltage of its X-axis, Y-axis output is V _Dd/ 2, i.e. 2.5V; The output voltage of Z axle output is V _Dd/ 2+0.66V, promptly about 3.2V.

This comparison circuit 24 is made up of six voltage comparator U1, U2, U3, U4, U5, U6, and each comparator U1, U2, U3, U4, U5, U6 include two an inputs (i.e. in-phase end U ₊With an end of oppisite phase U _-) and an output, as the in-phase end U of comparator U1, U2, U3, U4, U5, U6 ₊Input voltage is less than end of oppisite phase U _-During input voltage, comparator U1, U2, U3, U4, U5, U6 output low level are then exported high level on the contrary.Wherein these three are quickened the X-axis output of rule 22 and the in-phase end U1 of the first comparator U1 ₊End of oppisite phase U2 with the second comparator U2 _-Be electrically connected the in-phase end U3 of Y-axis output and the 3rd comparator U3 ₊End of oppisite phase U4 with the 4th comparator U4 _-Be electrically connected the in-phase end U5 of Z axle output and the 5th comparator U5 ₊End of oppisite phase U6 with the 6th comparator U6 _-Be electrically connected, these comparators U1, U2, U3, U4, U5, U6 are divided into into three groups, and two comparators (U1, U2), (U3, the U4) or (U5, U6) that are electrically connected with three outputs that quicken the same axle (X-axis, Y-axis or Z axle) of rule 22 form one group respectively.Another input U1 of comparator U1, U2, U3, U4, U5, U6 _-, U2 ₊, U3 _-, U4 ₊, U5 _-, U6 ₊Then be electrically connected, i.e. the end of oppisite phase U1 of the first comparator U1 with other outputs 162,163,164,165 in voltage of voltage regulation source 10 _-, the 3rd comparator U3 end of oppisite phase U3 _-All be electrically connected the in-phase end U2 of the second comparator U2 with the 5th output 165 ₊, the 4th comparator U4 in-phase end U4 ₊Be electrically connected the end of oppisite phase U5 of the 5th comparator U5 respectively with the 4th output 164 _-Be electrically connected the in-phase end U6 of the 6th comparator U6 with second output 162 ₊Be electrically connected with the 3rd output 163.

In the present embodiment, suppose that these three sensitivity of quickening rule 22 are ± 0.1V, in order to make these three to quicken inclination or the accelerated motion that rule 22 are taken place a little, the output voltage of at least one output in X-axis, Y-axis, the Z axle is changed and go beyond the scope, the voltage swing of determining 165 outputs of the 5th output in view of the above is 2.6V, the voltage of the 4th output 165 outputs is 2.4V, and the voltage swing of second output, 165 outputs is 3.3V, and the voltage swing of the 3rd output 165 outputs is 3.1V.When these three acceleration rule 22 were in stable state, the output voltage of its X-axis, Y-axis, Z axle output was respectively 2.5V, 2.5V, 3.2V, makes the in-phase input end U of each comparator U1, U2, U3, U4, U5, U6 ₊Voltage all less than its inverting input U _-Voltage, thereby comparator U1, U2, U3, U4, the equal output low level 0V of U5, U6.Otherwise, when these three quicken rule 22 when being in unsteady state such as installing or unloading process in, when making the output voltage of arbitrary axle (X-axis, Y-axis or Z axle) output exceed 2.4V～2.6V or this scope of 3.1V～3.3V, will cause among above-mentioned three groups of comparators (U1, U2), (U3, the U4) or (U5, U6) the in-phase input end U of one of them comparator of at least one group ₊Voltage be higher than its inverting input U _-Voltage, thereby make this comparator output high level.Such as two comparators (U1, U2) of first group that are connected with the X-axis with these three acceleration rule 22 is example, the in-phase end U1 of the first comparator U1 ₊End of oppisite phase U2 with the second comparator U2 _-All be electrically connected, quicken rule 22 owing to being in output voltage that unsteady state makes the X-axis output when these three, will cause the in-phase input end U1 of the first comparator U1 greater than 2.6V with the X-axis output ₊Voltage be higher than its inverting input U1 _-Voltage, thereby make first comparator U1 output high level; In like manner, when the output voltage of X-axis output becomes less than 2.4 the time, will cause the in-phase input end U2 of the second comparator U2 ₊Voltage be higher than its inverting input U2 _-Voltage, thereby make second comparator U2 output high level.

Because input U1 among the cut-in voltage 5V of above-mentioned three acceleration rule 22 and each comparator U1, U2, U3, U4, U5, the U6 _-, U2 ₊, U3 _-, U4 ₊, U5 _-, U6 ₊Input voltage 2.6V, 2.4V, 2.6V, 2.4V, 3.1V, 3.3V provide by voltage of voltage regulation source 10, the battery pack 12 available output voltages in this voltage of voltage regulation source 10 of hypothesis are 7.4V in the present embodiment, can determine first respectively thus, second, the 3rd, the the 4th and the 5th bleeder circuit 141,142,143,144, each resistance R 1 in 145, R2, R3, R4, R5, R6, R7, R8, R9, the resistance of R10, make from this two resistance R 1, the output voltage size of the output 161 of drawing between the R2 is 5V, and this output 161 is connected to three switch pin position V that quicken rule 22 by resistance R 45 _Dd, make the output voltage size of the output 162 of drawing between two resistance R 3 from second bleeder circuit 142, the R4 be 3.3V, and be connected to the end of oppisite phase U5 of the 5th comparator U5 _-, make the output voltage size of the output 163 of drawing between two resistance R 5 from the 3rd bleeder circuit 143, the R6 be 3.1V, and be connected to the in-phase end U6 of the 6th comparator U6 ₊, make the output voltage size of the output 164 of drawing between two resistance R 7 from the 4th bleeder circuit 144, the R8 be 2.4V, and be connected to the in-phase end U2 of the second, the 4th comparator U2, U4 ₊, U4 ₊, make the output voltage size of the output 165 of drawing between two resistance R 9 from the 5th bleeder circuit 145, the R10 be 2.6V, and be connected to the end of oppisite phase U1 of the first, the 3rd comparator U1, U3 _-, U3 _-

This selection circuit 26 comprises five or 261,262,263,264,265, and each or door 261,262,263,264,265 comprises two inputs and an output, wherein the output of first and second comparator U1, U2 is connected to first or door 261 two inputs respectively, three, the output of the 4th comparator U3, U4 is connected to second or door 262 two inputs respectively, and the output of the 5th, the 6th comparator U5, U6 is connected to the 3rd or two inputs of door 263 respectively.The output result of these three or 261,262,263 couples comparator U1, U2, U3, U4, U5, U6 carries out computing, when same or door 261,262,263 the equal input low level of two inputs, its output is output low level also, when one was high level in two inputs, its output was promptly exported high level.The output of first, second or door 261,262 be connected to the 4th or two inputs of door 264, the 4th, the 3rd or the output of door 264,263 be connected to the 5th or two inputs of door 265 again.Therefore, arbitrary comparator U1 in comparison circuit 24, U2, U3, U4, U5, U6 is output as high level, promptly when the output voltage variation of X-axis output and greater than 2.6V or less than 2.4V, perhaps the output voltage of Y-axis output changes and greater than 2.6V or less than 2.4V, perhaps the output voltage of Z axle output changes and during greater than 3.3V or less than 3.1V, the 5th or door 265 output will export high level, promptly when three X-axis of quickening rule 22, Y-axis, the output voltage of arbitrary output changes and when exceeding certain limit, selects circuit 26 last output high level in the Z axle.

This control circuit 30 comprises a voltage comparator U7 and a switching circuit 32.The end of oppisite phase U7 of this comparator U7 _-With in the sensing circuit 20 the 5th or door 265 output be electrically connected in-phase end U7 ₊Then be connected between battery 100 and the system 150 through a resistance R 33, two Schottky diode D1, D2 are connected the in-phase end U7 of comparator U7 ₊And between ground (GND).It is little that Schottky diode D1, D2 have forward conduction voltage, and the good advantage of voltage regulation performance after the conducting, and the voltage stabilizing value after this two Schottky diode D1, the D2 conducting is the in-phase end U7 of this comparator U7 ₊Input voltage, the voltage stabilizing value of hypothesis during this two Schottky diodes conducting is 0.4V in the present embodiment.Identical with each comparator U1, U2 in the comparison circuit 24, U3, U4, U5, U6, as the end of oppisite phase U7 of comparator U7 _-Input voltage (promptly the 5th or the door 265 outputs output voltage) greater than its in-phase end U7 ₊During input voltage, the output output low level of comparator U7, promptly when the output voltage of arbitrary output in three X-axis of quickening rule 22, Y-axis, the Z axle changes and exceeds certain limit, select the end of oppisite phase U7s of circuit 26 last output high level to comparator U7 _-, make the output output low level of comparator U7.

This switching circuit 32 is connected to form by Metal-oxide-semicondutor field effect transistor (Meial-Oxide-Semiconductor Field Effect Transistor, MOSFET are called for short metal-oxide-semiconductor field effect transistor) Q1, Q2 and resistance R 31.Wherein the grid G of Q2 links to each other with the output of comparator U7, source S ground connection, drain D links to each other with the grid G of Q1, and the source S of Q1 links to each other with battery 100, drain D then is connected to system 150, and resistance R 31 is connected between the source S of Q1 and the drain D of Q2 (grid G of Q1).Q2 is the N channel enhancement metal-oxide-semiconductor field effect transistor of positive voltage conducting, when adding that voltage is equal to or greater than the threshold voltage (VT) of Q2 between grid G and the source S, and the Q2 conducting.Q1 is the P-channel enhancement type metal-oxide-semiconductor field effect transistor of negative voltage conducting, the difference of itself and N channel enhancement metal-oxide-semiconductor field effect transistor is, the threshold voltage of Q1 is a negative, and when to add voltage between grid G and the source S be negative voltage and absolute value greater than the absolute value of its threshold voltage, Q1 just understood conducting.In the present embodiment, suppose that the absolute value of the threshold voltage of Q1 equates with the threshold voltage of Q2, and the threshold voltage of supposition Q2 is 4.5V.When the output output low level of comparator U7, the grid G that is Q2 inserts low level, Q2, all not conductings of Q1 in the switching circuit 32, switching circuit 32 cuts out, promptly when the output voltage of arbitrary output in three X-axis of quickening rule 22, Y-axis, the Z axle changed, the output output low level of comparator U7 was to the grid G of Q2, and switching circuit 32 cuts out, battery 100 to system's 150 power supplies, is not known clearly as described later.

This feedback circuit 40 comprises the N channel enhancement metal-oxide-semiconductor field effect transistor Q3 of a positive voltage conducting, and the grid G of Q3 is electrically connected with a feedback voltage end 152 of system 150, source S ground connection, and three switch pin position V that quicken rule 22 in drain D and the sensing circuit 20 _DdConnect, when battery 100 is installed stable and during to system's 150 power supplies, system 150 closes three by this feedback circuit 40 and quickens rule 22.In the present embodiment, suppose that the threshold voltage of Q3 equates with the threshold voltage of Q2.

The course of work of this protective circuit is described with a specific embodiment below, and supposing the system 150 required operating voltages are 20V, and promptly to provide voltage to system 150 be the operating voltage of 20V to battery 100.

In the process that battery 100 is being installed or dismantled, three are quickened the variation that rule 22 will sense battery 100 displacements, its X-axis, Y-axis, the output voltage of three outputs of Z axle also constantly changes thereupon, make the output voltage of X-axis output greater than 2.6V or less than 2.4V, perhaps the output voltage of Y-axis output is greater than 2.6V or less than 2.4V, perhaps the output voltage of Z axle output is greater than 3.3V or less than 3.1V, thereby make comparator U1, U2, U3, U4, U5, has an output output high level 5V among the U6 at least, thereby the 5th or door 265 output also export high level 5V, this high level 5V inputs to the end of oppisite phase U7 of comparator U7 in the control circuit 30 _-, make the end of oppisite phase U7 of comparator U7 _-Input voltage greater than in-phase end U7 ₊Input voltage, final comparator U7 is with output low level 0V, this low level 0V inputs to the grid G of Q2, makes that the grid G of Q2 and the voltage between the source S are 0V, thereby not conducting of Q2.And not conducting of Q2, voltage between the grid G of Q1, the source S then, thereby also not conducting of Q1, form open circuit between battery 100 and the system 150, battery 100 is not to system's 150 power supplies, thereby avoided producing electric spark when battery 100 is with system's 150 unstable contacts in installation or the unloading process, guaranteed the safety of system 150.

When battery 100 installations were stablized, three were quickened the X-axis of rule 22 and the voltage of Y-axis input 2.5V, and the voltage of Z axle input 3.2V, the in-phase input end U of each comparator U1, U2, U3, U4, U5, U6 ₊Voltage all less than its inverting input U _-Voltage, comparator U1, U2, U3, U4, the equal output low level 0V of U5, U6, therefore, the 5th or the door 265 last output low level 0V.In the control circuit 30, because the voltage stabilizing value of two Schottky diode D1, D2 is 0.4V, thereby the in-phase end U7 of comparator U7 ₊Input voltage be 0.8V, and end of oppisite phase U7 _-Input voltage be the 5th or door 265 output voltage be low level 0V, end of oppisite phase U7 _-Input voltage less than in-phase end U7 ₊Input voltage, the grid G of comparator U7 output high level 5V to Q2 makes that voltage is 5V between the grid G of Q2 and the source S, greater than the threshold voltage 4.5V of Q2, Q2 opens, and forms path between the drain D of Q2 and the source S.Because the source S ground connection of Q2, the drain D of Q2 and source S the two poles of the earth all become low level, what yet the output voltage of the drain D of Q2 was Q1 adds grid G voltage, thereby the voltage between grid G and the source S of adding of Q1 is that the voltage at R31 two ends is-20V, its absolute value is greater than the absolute value of the threshold voltage of Q1, Q1 is conducting also, forms path between the drain D of Q1 and the source S, and battery 100 is to system's 150 power supplies.At this moment, the feedback voltage of a 5V of feedback voltage end 152 outputs of system 150 is to the grid G of Q3, and Q3 opens, and forms path between the drain D of Q3 and the source S, connects these three and quickens rule 22 switch pin position V _DdInput 161 form series via through drain D, source S and the earth polar of resistance R 45, Q3, three are quickened rule 22 and are quit work by short circuit.After this in the process, battery 100 will realize continuing 150 power supplies to system.

Claims

1. battery protecting circuit, be used to control the power supply of battery to system, it is characterized in that: this battery protecting circuit comprises a sensing circuit, one control circuit and a voltage of voltage regulation source, this sensing circuit comprises that one three are quickened rule, one comparison circuit and a selection circuit that is connected with this comparison circuit, this comparison circuit is connected to form by some voltage comparators, each voltage comparator comprises two inputs and an output, an input and three X-axis of quickening rule of this each voltage comparator, Y-axis is connected with wherein one output in the Z axle, another input of this each voltage comparator links to each other with a reference voltage respectively, and the output of this each voltage comparator is connected with selecting circuit; This control circuit comprises a voltage comparator, at least one Schottky diode and a switching circuit, the in-phase end of this control circuit voltage comparator is connected to battery by a resistance, this at least one Schottky diode is connected between the in-phase end and earth polar of control circuit voltage comparator, the end of oppisite phase of this control circuit voltage comparator is electrically connected with the output of selection circuit in the described sensing circuit, and switching circuit is electrically connected with the output of this control circuit voltage comparator; Described voltage of voltage regulation source comprises the several dividing circuit, one of them bleeder circuit is electrically connected with three acceleration rule, the reference voltage of each voltage comparator of described comparison circuit is provided by one of them bleeder circuit in these other bleeder circuits of voltage of voltage regulation source respectively, these three variations of quickening rule position when being used for the sensing battery and being in unsteady state, and these three X-axis of quickening rule, Y-axis, the output voltage of three outputs of Z axle changes with the change in location of battery, this sensing circuit is according to three X-axis of quickening rule, Y-axis, the output voltage of three outputs of Z axle is last to produce the voltage comparator of a control voltage to the described control circuit, when battery is in unsteady state, this control voltage is closed this control circuit and battery can not be realized this system's power supply, when battery was in stable state, this control voltage was opened this control circuit and battery is realized this system's power supply.

2. battery protecting circuit as claimed in claim 1; it is characterized in that: described switching circuit comprises two Metal-oxide-semicondutor field effect transistor and a resistance; described two Metal-oxide-semicondutor field effect transistor are respectively the N channel enhancement field effect transistor that source electrode is connected a P-channel enhancement type field effect transistor of battery and the output that grid is connected the control circuit voltage comparator; the source ground of this N channel enhancement field effect transistor; the drain electrode of this N channel enhancement field effect transistor is connected with the grid of this P-channel enhancement type field effect transistor; the drain electrode of this P-channel enhancement type field effect transistor is connected with system, and this resistance is connected between the grid of battery and P-channel enhancement type field effect transistor.

3. battery protecting circuit as claimed in claim 1; it is characterized in that: also comprise the system of being connected in and three feedback circuits that quicken between the rule; described feedback circuit comprises the N channel enhancement Metal-oxide-semicondutor field effect transistor that grid is connected with system; this field effect transistor source ground; drain electrode is connected to these three switch pin positions of quickening rule, and this feedback circuit is in stable state and battery is realized the feedback voltage that the system that accepts when system power sends and interrupt the power supplies of this voltage of voltage regulation source to these three switch pin positions of quickening to advise at battery.

4. battery protecting circuit as claimed in claim 1; it is characterized in that: this comparison circuit comprises six voltage comparators; this selection circuit comprise five or; each or door comprise two inputs and an output; six outputs of these six voltage comparators respectively with wherein three or six inputs be electrically connected; these three or in wherein two output with the 4th or the door two inputs be electrically connected; these three or in another one or door output with the 4th or the output of door is electrically connected with the 5th or two inputs of door respectively, described control voltage by the 5th or output export.

5. battery protecting circuit as claimed in claim 4; it is characterized in that: these six voltage comparators are respectively first voltage comparator; second voltage comparator; the tertiary voltage comparator; the 4th voltage comparator; the 5th voltage comparator and the 6th voltage comparator; these the three X-axis outputs that quicken rule are electrically connected with the in-phase input end of first voltage comparator and the inverting input of second comparator; the Y-axis output is electrically connected with the in-phase input end of tertiary voltage comparator and the inverting input of the 4th voltage comparator, and Z axle output is electrically connected with the in-phase input end of the 5th voltage comparator and the inverting input of the 6th voltage comparator.

6. battery protecting circuit as claimed in claim 5; it is characterized in that: described voltage of voltage regulation source comprises five bleeder circuits and is connected to five outputs on these five bleeder circuits; wherein an output is electrically connected with three switch pin positions of quickening rule; an other output is simultaneously with first; the inverting input of tertiary voltage comparator is electrically connected; an other again output is simultaneously with second; the in-phase input end of the 4th voltage comparator is electrically connected, and all the other two outputs are electrically connected with the inverting input of the 5th voltage comparator and the in-phase input end of the 6th voltage comparator respectively at last.

7. a battery is used for the power supply to system, and it is characterized in that: be integrated with a protective circuit in this battery, this protective circuit is each described battery protecting circuit of claim 1 to 6.