CN103064024A - Battery power estimation device - Google Patents
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- CN103064024A CN103064024A CN2011103164851A CN201110316485A CN103064024A CN 103064024 A CN103064024 A CN 103064024A CN 2011103164851 A CN2011103164851 A CN 2011103164851A CN 201110316485 A CN201110316485 A CN 201110316485A CN 103064024 A CN103064024 A CN 103064024A
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Abstract
One of embodiments of the invention provides a battery power estimation device. The device comprises an impedance element, a switch, a control circuit, a voltage detection circuit and an estimate circuit. The impedance element is coupled to a first power supply terminal and a second power supply terminal of a battery. The switch is coupled between the impedance element and the first power supply terminal. The control circuit conducts the switch intermittently as a preset frequency. The voltage detection circuit detects a difference of voltages of two ends of the impedance element. The estimate circuit generates a power estimation value of the battery according to a consulting result of the voltage difference in a power comparison table. Therefore, by using the device of the invention, energy consumed by the battery power estimation device to carry out power estimation can be reduced and the accurate power estimation can be performed on more variety of the batteries.
Description
Technical field
The present invention is relevant for a kind of battery electric quantity estimation unit, the espespecially a kind of estimation unit that can accurately estimate battery electric quantity.
Background technology
Because the technology that battery is relevant is constantly progressive, even so that many portable apparatus adopt powered battery, also can be arranged suitable service time.In addition, also there are the increasing vehicles to adopt the modes such as electric power or hybrid power to drive, and make the related application of battery more extensive.Yet when adopting powered battery, the user still must note the dump energy of battery, in order to can in time charge or change battery.
In existing technology, resistance string can be connected to battery, and by electric current and the voltage of monitoring battery and resistance, estimate the dump energy of battery.Yet, be connected in series the electric current that has that can continue to the resistance of battery and pass through, and consumed the electric power of part, cause the unnecessary waste of the energy.Especially when electronic equipment at present healed to get over power saving, the ratio regular meeting of the resistance institute power consumption of serial connection was more and more higher, and becomes problems to be solved.
On the other hand, the battery of many new kinds has different qualities, for example, when the electric weight of battery between 90% to 10% the time, battery is exportable roughly the same voltage and current all, so that stable electric power output to be provided.Therefore, if use existing method that this type of battery is carried out the estimation of battery electric quantity, then may cause sizable error.
Summary of the invention
In view of this, how to reduce the energy that the battery electric quantity estimation unit consumes, can be applied to a greater variety of batteries again, real is the industry problems to be solved.
This instructions provides a kind of battery electric quantity estimation unit, includes: an impedor, in order to one first feeder ear and one second feeder ear that is coupled to a battery; One first switch is in order to be coupled between this impedor and this first feeder ear; One control circuit, be used to one first period with this first switch with the intermittent conducting of a first frequency, and in one second period with this first switch with the intermittent conducting of a second frequency; One current detection circuit is coupled to this impedor, when being used to this first period, detects one first current value that this impedor passes through, and when this second period, detects one second current value that this impedor passes through; An and estimating circuit, in the result that consults of an electric weight table of comparisons, and produce an electric weight estimated value of this battery in order to one or more AC impedance values of producing according to this first current value and this second current value and/or according to this first current value and/or this second current value.
This instructions provides a kind of battery electric quantity estimation unit in addition, includes: an impedor, in order to one first feeder ear and one second feeder ear that is coupled to a battery; One first switch is in order to be coupled between this impedor and this first feeder ear; One control circuit, be used to one first period with this first switch with the intermittent conducting of a first frequency; One voltage detecting circuit is coupled to this impedor, when being used to this first period, detects one first voltage difference at these impedor two ends and/or the second voltage difference between this first feeder ear and this second feeder ear; An and estimating circuit, in the result that consults of an electric weight table of comparisons, and produce an electric weight estimated value of this battery in order to one or more AC impedance values of producing according to this first voltage difference, this second voltage difference and/or according to this first voltage difference and/or this second voltage difference.
This instructions provides a kind of battery electric quantity estimation unit in addition, includes: an impedor, in order to one first feeder ear and one second feeder ear that is coupled to a battery; One transistor switch is in order to be coupled between this impedor and this first feeder ear; One control circuit is used to this first switch conduction of one first period, and periodically changes the control end voltage of this transistor switch with a first frequency; One voltage detecting circuit is coupled to this impedor, when being used to this first period, detects one first voltage difference at these impedor two ends and/or the second voltage difference between this first feeder ear and this second feeder ear; And an estimating circuit, in order to according to this first voltage difference and/or this second voltage difference in the result that consults of an electric weight table of comparisons, and produce an electric weight estimated value of this battery.
One of advantage of above-described embodiment is can carry out rapidly electric weight to battery to estimate, and can make the battery electric quantity estimation unit carry out reducing when electric weight is estimated the energy that consumes.Another advantage of above-described embodiment is to carry out more accurately electric weight estimation to a greater variety of batteries.Other advantage of the present invention will be described in detail by the following description and accompanying drawing.
Description of drawings
Fig. 1 is the functional block diagram after the electronic equipment of one embodiment of the invention is simplified.
Fig. 2 is the sequential chart after an embodiment of the control signal that produces of the control circuit of Fig. 1 simplifies.
Fig. 3 is the partial content of an embodiment of the electric weight table of comparisons.
Fig. 4 is the partial content of another embodiment of the electric weight table of comparisons.
Fig. 5 is the drain current of an embodiment of transistor switch and the family curve of gate-source voltage difference.
Embodiment
Below will cooperate correlative type that embodiments of the invention are described.In graphic, identical label represents identical or similar element or process step.
Fig. 1 is the functional block diagram after the simplification of electronic equipment 100 of one embodiment of the invention, and electronic equipment 100 includes battery 110 and electric weight estimation unit 120, and with other element in the electronic equipment with square 190 expressions.Omit other element and annexation among Fig. 1, so that explanation.
Electric weight estimation unit 120 is coupled to the two ends of battery 110, and includes impedor 121, switch 124 and 125 (also can be called the first switch and second switch), control circuit 126, testing circuit 127 and estimating circuit 128.
One end points 122 of impedor 121 is coupled to the negative output terminal 112 of battery, another end points 123 of impedor 121 then by switch 124 and 125 respectively according to control signal Cs and Ct, and be coupled to positive output end 111 or the negative output terminal 112 of battery.The resistance value of impedor 121 is Z121, and in Fig. 1, the voltage at end points 123 places of impedor 121 is denoted as Vm.
The current value that testing circuit 127 (also can be described as voltage detecting circuit and/or current detection circuit) passes through in order to magnitude of voltage, voltage difference and/or the impedor 121 that detects impedor 121 two ends, and magnitude of voltage, voltage difference or the current value that detects be sent to estimating circuit 128.
The magnitude of voltage that estimating circuit 128 transmits according to testing circuit 127, current value or voltage difference carry out computing or consult in the electric weight table of comparisons, to produce the electric weight estimated value of battery 110.The electric weight table of comparisons can be stored in the inner or outside various volatile formula of electric weight estimation unit 120 or the storage device of non-volatile formula.
Because the remaining electric weight of battery 110 is not simultaneously, the dc impedance value R113 of impedor 113 may difference and little, and can't estimate accurately the electric weight that battery 110 is remaining.Therefore, electric weight estimation unit 120 is set to not conducting by use control circuit 126 with switch 125, and intermittently switch 124 is set to conducting, and makes alternating current Iac flow into electric weight estimation unit 120.At this moment, electric weight estimation unit 120 can be in the hope of the AC impedance value Z113 of impedor 113, and estimates more accurately the dump energy of battery 110.
For example, control circuit 126 can make switch 125 not conductings, and with first frequency f1 actuating switch 124 off and on, makes the end points 123 of impedor 121 be coupled to off and on the end points 111 of battery 110, and makes alternating current Iac flow into electric weight estimation unit 120.Therefore, voltage Vp=(Idc+Iac) * Z113+VB=(Idc+Iac) * of the end points 111 of battery 110 [R113+1/ (2 π f1C113)]+VB, wherein Iac=Vm/Z121.
Magnitude of voltage, voltage difference and/or current value that estimating circuit 128 can detect according to testing circuit 127, and the above-mentioned equation of foundation is tried to achieve the AC impedance value Z113=R113+1/ (2 π f1C113) of impedor 113, to estimate the dump energy of battery 110.For example, estimating circuit 128 is with AC impedance value R113+1/ (2 π fC113), compares in the table of comparisons of the AC impedance value of impedor 113 and battery 110 dump energies, and estimates the dump energy of battery 110.
In another embodiment, control circuit 126 can make switch 125 not conductings, and in addition with second frequency f2 actuating switch 124 off and on, the end points 123 of impedor 121 can be coupled to the end points 111 of battery 110 off and on, and makes alternating current Iac flow into electric weight estimation unit 120.Therefore, make voltage Vp=(Idc+Iac) * Z113+VB=(Idc+Iac) * [R113+1/ (2 π f2C113)] of the end points 111 of battery 110+VB, wherein Iac=Vm/Z121.
At this moment, magnitude of voltage, voltage difference and/or current value that estimating circuit 128 can detect according to testing circuit 127, and try to achieve impedor 113 in the AC impedance value R113+1/ of two frequency f 1 and f2 (2 π f1C113) and R113+1/ (2 π f2C113) according to above-mentioned equation, to estimate the dump energy of battery 110.For example, estimating circuit 128 is with AC impedance value R113+1/ (2 π f1C113) and R113+1/ (2 π f2C113), in the table of comparisons of the AC impedance value of impedor 113 and battery 110 dump energies, compare, and estimate the dump energy of battery 110.
In other embodiments, control circuit 126 can make switch 125 not conductings, and with one or more frequencies actuating switch 124 off and on, and the magnitude of voltage that estimating circuit 128 direct basis testing circuits 127 detect, voltage difference and/or current value, the contrast magnitude of voltage, the table of comparisons of at least one of them and battery 110 dump energies of voltage difference and/or current value, by in the table of comparisons, consulting as alternating current Iac during with one or more frequency change, the magnitude of voltage that detects, the charge value of voltage difference and/or battery that current value corresponds to 110, and the electric weight estimated value of generation battery 110.
In other embodiments, the AC impedance value that estimating circuit 128 also can impedor 113, magnitude of voltage, voltage difference and/or the current value that testing circuit 127 detects be as parameter, and directly calculate the electric weight estimated value of battery 110.
Fig. 2 is that 120 pairs of batteries of electric weight estimation unit 110 of Fig. 1 carry out electric weight when estimating, the oscillogram after control signal Cs and Ct simplify below will with Fig. 2 Fig. 1 that arranges in pairs or groups, further specify 120 pairs of batteries of electric weight estimation unit 110 and carry out the mode that electric weight is estimated.
In the period of Fig. 2 T0, control circuit 126 can be set to electronegative potential by control signal Cs, and control signal Ct is set to noble potential, make switch 124 present not on-state, and make switch 125 present conducting state, be coupled to negative output terminal 112 with the end points 123 with impedor 121, allowing the two-end-point 122 of impedor 121 and 123 be discharged to voltage difference is 0.At this moment, flowed into the electric current I ac (T0)=0 of electric weight estimation unit 120 by battery 110.
The period of Fig. 2 T1 (also can be referred to as for the first period), control circuit 126 can be set to electronegative potential by control signal Ct, and control signal Cs is set to high potential state off and on frequency f 1 (also can be referred to as first frequency).Make switch 125 present not on-state, and make switch 124 with the frequency f 1 off and on end points 123 and positive output end 111 of conduction impedance element 121.At this moment, battery 110 has electric current I ac (T1) and flows into electric weight estimation unit 120, and by switch 124 and impedor 121.
In the period of Fig. 2 T2, control circuit 126 can be set to electronegative potential by control signal Cs, and control signal Ct is set to noble potential, make switch 124 present not on-state, and make switch 125 present conducting state, be coupled to negative output terminal 112 with the end points 123 with impedor 121, allowing the two-end-point 122 of impedor 121 and 123 be discharged to voltage difference is 0.At this moment, flowed into the electric current I ac (T2)=0 of electric weight estimation unit 120 by battery 110.
The period of Fig. 2 T3 (also can be referred to as for the second period), control circuit 126 can be set to electronegative potential by control signal Ct, and control signal Cs is set to high potential state off and on frequency f 2 (also can be referred to as second frequency).Make switch 125 present not on-state, and make switch 124 with the frequency f 2 off and on end points 123 and positive output end 111 of conduction impedance element 121.At this moment, battery 110 has electric current I ac (T3) and flows into electric weight estimation unit 120, and by switch 124 and impedor 121.
In one embodiment, estimating circuit 128 can be consulted in the electric weight table of comparisons according to current value I ac (T1) and Iac (T3), to produce the electric weight estimated value of battery 110.For example, Fig. 3 shows the partial content of another embodiment of the electric weight table of comparisons, in the electric weight table of comparisons of Fig. 3, two current value I ac (T1) and Iac (T3) that estimating circuit 128 meetings transmit according to testing circuit 127, in the electric weight table of comparisons, consult, and estimate the electric weight of battery 110.For example, when the first current value I ac (T1) is 0.25 ampere, and the second current value I ac (T1) is 0.28 ampere, and estimating circuit 128 can be consulted the electric weight estimated statement of Fig. 3, and estimates the electric weight that battery 110 still has 800 Milliampere Hours.
In another embodiment, when estimating circuit 128 is understood according to period T1 and T3, magnitude of voltage and/or the voltage difference at impedor 121 two ends, and in another electric weight table of comparisons, consult, to produce the electric weight estimated value of battery 110.For example, Fig. 4 shows the partial content of another embodiment of the electric weight table of comparisons, in this embodiment, when the voltage difference that transmits when estimating circuit 128 receiving test circuits 127 was 0.9 volt, estimating circuit 128 can be consulted the electric weight table of comparisons and estimate the electric weight that battery 110 still has 800 Milliampere Hours.
In another embodiment, the voltage difference at impedor 121 two ends and/or the voltage difference at impedor 121 two ends during according to period T3 when estimating circuit 128 also can be according to period T1, and in the electric weight table of comparisons of similar Fig. 4, consult, to produce the electric weight estimated value of battery 110.
In another embodiment, estimating circuit 128 can according to the table of comparisons of at least one of them and the battery dump energy of the AC impedance value of impedor 113, magnitude of voltage, voltage difference and/or current value that testing circuit 127 detects, produce the electric weight estimated value of battery 110.
In the above-described embodiment, switch 124 and/or switch 125 also can adopt the mode of transistor switch to implement, for example, mos field effect transistor (MOSFET), bipolarity junction transistor (BJT) or other suitable transistor switch.
For example, in one embodiment, switch 124 adopts MOSFET, and has drain electrode (drain) electric current of MOSFET as shown in Figure 5 and the family curve of gate-source voltage (Vgs).Therefore, control circuit 126 can arrange by control signal Cs the voltage of the grid (also can be described as control end) of MOSFET, and the drain current Id of control MOSFET, that is the electric current that passes through of gauge tap 124.
Therefore, in the period of Fig. 2 T1 and T3, control circuit 126 makes switch 125 present not on-state by control signal Ct is set, and control circuit 126 changes (as shown in Figure 5) with frequency f 1 and frequency f 2 by control signal Cs is set respectively with the control end voltage of switch 124 between voltage V1 to V2, make current value I ac (T1) by switch 124 and Iac (T3) also with the frequency of frequency f 1 and frequency f 2 in changing between I1 to I2.
The current value that testing circuit 127 passes through in order to magnitude of voltage, voltage difference and/or the impedor 121 that detects impedor 121 two ends, and magnitude of voltage, voltage difference or the current value that detects be sent to estimating circuit 128.The current value that estimating circuit 128 transmits according to testing circuit 127, magnitude of voltage and/or voltage difference, and in the electric weight table of comparisons, consult, to produce the electric weight estimated value of battery 110.
In the above-described embodiment, in period T1 and T3, control signal Cs can adopt the periodic waveform such as square wave, string ripple or sawtooth slope.
In the above-described embodiment, testing circuit 127 can average magnitude of voltage, the voltage difference at impedor 121 two ends and/or current value that impedor 121 passed through, weighted mean, get maximal value or get the modes such as minimum value and carry out computing, and export the magnitude of voltage after the computing, voltage difference and/or current value to estimating circuit 128, make the estimating circuit 128 can be according to the current value after the computing, magnitude of voltage and/or voltage difference, in the electric weight table of comparisons, consult, to produce the electric weight estimated value of battery 110.
In the above-described embodiment, the electric weight table of comparisons one or more AC impedance that can record impedor 113 are worth the corresponding battery electric quantity value of one or more magnitudes of voltage at corresponding battery electric quantity value, impedor 121 two ends, the corresponding battery electric quantity value of one or more voltage differences at impedor 121 two ends and/or the corresponding battery electric quantity value of one or more current values that impedor 121 passes through.
Not only can record AC impedance value, magnitude of voltage, voltage difference and/or the corresponding battery electric quantity value of current value in the electric weight table of comparisons, also can record AC impedance value scope, range of voltage values, voltage difference scope and/or the corresponding battery electric quantity value of current value range.For example, the electric weight table of comparisons among Fig. 4 also can be recorded as when the voltage difference at impedor 121 two ends is 0.3～0.33 volt, and estimating circuit 128 can estimate the electric weight that battery has 200 Milliampere Hours approximately.
In the above-described embodiment, testing circuit 127 also can be set to detect the positive output end 111 of battery 110 and the voltage difference between the negative output terminal 112.For example, when the period of Fig. 3 T1, use testing circuit 127 to detect positive output end 111 and the voltage difference between the negative output terminal 112 (also can be referred to as the second voltage difference) of battery 110, and when the period of Fig. 3 T3, use testing circuit 127 to detect positive output end 111 and the voltage difference between the negative output terminal 112 (also can be referred to as the 4th voltage difference) of battery 110, and the voltage difference that uses estimating circuit 128 to detect according to testing circuit 127, in the electric weight table of comparisons, consult, to produce the electric weight estimated value of battery 110.
In the above-described embodiment, adopt the form by battery 110 discharges, make alternating current Iac flow into electric weight estimation unit 120.In other embodiments, also can adopt the elements such as booster circuit, and flow out alternating current to battery 110 by electric weight estimation unit 120, estimate with the electric weight that carries out battery 110.
In the above-described embodiment, the unit that the electric weight table of comparisons records also can be according to different applied environments, and suitably select.For example, can be with electric weight record for the kenel of number percent etc.
In the above-described embodiment, the electric weight table of comparisons can produce by the battery of a plurality of same sizes of statistics, perhaps also can be when using electronic equipment 100, and according to the characteristic adjustment of battery, and the method for the above-described embodiment of all arranging in pairs or groups and carry out the estimation of electric weight.
One of advantage of above-described embodiment is that electric weight estimation unit 120 only need use the of short duration time that battery 110 is carried out the electric weight estimation, therefore can significantly reduce the electric power that consumes when carrying out the electric weight estimation.
Another advantage of above-described embodiment is the characteristic that electric weight estimation unit 120 utilizes the resistance value of impedor 113 to change according to the frequency of alternating current, therefore adopt the mode of alternating current to carry out the electric weight estimation, and can estimate more accurately the electric weight of battery.
Some vocabulary in instructions and the claim is used to censure specific element, and the person of ordinary skill in the field should understand, and same element may be called with different nouns.This instructions and claim not with the difference of title as the mode of distinguishing element, but come as the benchmark of distinguishing take the difference of element on function.Be an open term mentioned " comprising " in instructions and claim, so should be construed to " comprise but be not limited to ".In addition, " couple " word comprise any directly and indirectly connect means.Therefore, be coupled to the second device if describe first device in the literary composition, then represent first device and can be directly connected in the second device by signal connected modes such as electric connection, wire transmission, wireless transmission or optical delivery, or by other device or connection means indirectly electrically or signal be connected to this second device.
Instructions and graphic in, signal all with high state effectively (active high) mode express with simplified illustration, namely signal be effective (active) when noble potential.In claim and other embodiment, each signal can adopt also that high state is effective, low state effectively (active low) or use respectively high state effectively and the effective mode of low state represent.In addition, some signal, element, circuit, flow process or method of operating etc. are only described in the mode of voltage or electric current, but the person of ordinary skill in the field should understand, and the embodiment of voltage pattern or current forms all can be reached by suitable conversion effect of the present invention.
Instructions and graphic in quantity, position and the annexation etc. of element only be schematically narration and draw, with simplified illustration.Each element can be implemented with one or more elements in the instructions, and perhaps the function of a plurality of elements also can be implemented by identity element in the instructions, and all belongs to covering scope of the present invention.In addition, the person with usual knowledge in their respective areas will be understood that, when if some numerical value of narration or numerical range are identical in instructions and the claim, for example, numerical value or the numerical ranges such as time, resistance value, magnitude of voltage or current value, because impacts such as the error in process conditions, the design and appointed conditions, and cause these a little numerical value may be slightly different when implementing and still can reach effect of the present invention, also should belong to covering scope of the present invention.
The above only is preferred embodiment of the present invention, combination that all can be suitable between each embodiment and not mutual exclusion, and all equalizations of doing according to the present patent application claim change, modify and make up, and all belong to covering scope of the present invention.
Claims (10)
1. battery electric quantity estimation unit includes:
One impedor is in order to one first feeder ear and one second feeder ear that is coupled to a battery;
One first switch is in order to be coupled between this impedor and this first feeder ear;
One control circuit, be used to one first period with this first switch with the intermittent conducting of a first frequency, and in one second period with this first switch with the intermittent conducting of a second frequency;
One current detection circuit is coupled to this impedor, when being used to this first period, detects one first current value that this impedor passes through, and when this second period, detects one second current value that this impedor passes through; And
One estimating circuit, in the result that consults of an electric weight table of comparisons, and produce an electric weight estimated value of this battery in order to one or more AC impedance values of producing according to this first current value and this second current value and/or according to this first current value and this second current value.
2. battery electric quantity estimation unit as claimed in claim 1, other includes a second switch, be coupled between this impedor and this second feeder ear, wherein this control circuit can be between this first period and this second period, make this first switch present not on-state, and can make this second switch present conducting state.
3. battery electric quantity estimation unit as claimed in claim 1 or 2, this current detection circuit wherein, can be according to the magnitude of voltage at these impedor two ends and/or magnitude of voltage and/or the voltage difference of voltage difference and/or this first feeder ear and one second feeder ear, this first current value and this second current value that are passed through to detect this impedor.
4. battery electric quantity estimation unit includes:
One impedor is in order to one first feeder ear and one second feeder ear that is coupled to a battery;
One first switch is in order to be coupled between this impedor and this first feeder ear;
One control circuit, be used to one first period with this first switch with the intermittent conducting of a first frequency;
One voltage detecting circuit is coupled to this impedor, when being used to this first period, detects one first voltage difference at these impedor two ends and/or the second voltage difference between this first feeder ear and this second feeder ear; And
One estimating circuit, in the result that consults of an electric weight table of comparisons, and produce an electric weight estimated value of this battery in order to one or more AC impedance values of producing according to this first voltage difference, this second voltage difference and/or according to this first voltage difference and/or this second voltage difference.
5. battery electric quantity estimation unit as claimed in claim 4, wherein this control circuit can be in addition in one second period with this first switch with the intermittent conducting of a second frequency, this voltage detecting circuit can when this second period, detect a tertiary voltage difference at these impedor two ends and/or one the 4th voltage difference between this first feeder ear and this second feeder ear; And this estimating circuit can be according to this first voltage difference, this second voltage difference, this tertiary voltage difference and/or the 4th voltage difference in the result that consults of this electric weight table of comparisons, and produces this electric weight estimated value of this battery.
6. battery electric quantity estimation unit as claimed in claim 5, other includes a second switch, be coupled between this impedor and this second feeder ear, wherein this control circuit can be between this first period and this second period, make this first switch present not on-state, and can make this second switch present conducting state.
7. battery electric quantity estimation unit includes:
One impedor is in order to one first feeder ear and one second feeder ear that is coupled to a battery;
One transistor switch is in order to be coupled between this impedor and this first feeder ear;
One control circuit is used to this first switch conduction of one first period, and periodically changes the control end voltage of this transistor switch with a first frequency;
One voltage detecting circuit is coupled to this impedor, when being used to this first period, detects one first voltage difference at these impedor two ends and/or the second voltage difference between this first feeder ear and this second feeder ear; And
One estimating circuit, in order to according to this first voltage difference and/or this second voltage difference in the result that consults of an electric weight table of comparisons, and produce an electric weight estimated value of this battery.
8. battery electric quantity estimation unit as claimed in claim 7, wherein this control circuit can periodically change the control end voltage of this transistor switch in addition with a second frequency in one second period, this voltage detecting circuit can when this second period, detect a tertiary voltage difference at these impedor two ends and/or one the 4th voltage difference between this first feeder ear and this second feeder ear; And this estimating circuit can be according to this first voltage difference, this second voltage difference, this tertiary voltage difference and/or the 4th voltage difference in the result that consults of this electric weight table of comparisons, and produces this electric weight estimated value of this battery.
9. battery electric quantity estimation unit as claimed in claim 8, other includes a second switch, be coupled between this impedor and this second feeder ear, wherein this control circuit can be between this first period and this second period, make this first switch present not on-state, and can make this second switch present conducting state.
10. battery electric quantity estimation unit as claimed in claim 7, wherein this voltage detecting circuit can be according to this first voltage difference and/or this second voltage difference, and produce one or more current estimation values and/or one or more AC impedance value, and this estimating circuit is understood the result that consults according to these one or more current estimation values and/or these one or more AC impedance values and this electric weight table of comparisons, and produces this electric weight estimated value of this battery.
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| CN104267240A (en) * | 2014-10-16 | 2015-01-07 | 黄辉 | Low-power-consumption vibration detection lithium battery pack voltage detecting method and device |
| CN105954684A (en) * | 2016-05-27 | 2016-09-21 | 北京小鸟看看科技有限公司 | Cell electricity quantity detection method and device |
| CN111474482A (en) * | 2020-04-29 | 2020-07-31 | 珠海优特物联科技有限公司 | Electric quantity detection model establishing method, electric quantity detection method and device and electronic equipment |
| CN112448433A (en) * | 2019-09-03 | 2021-03-05 | 苏州宝时得电动工具有限公司 | Electric tool |
| CN113866658A (en) * | 2021-12-01 | 2021-12-31 | 荣耀终端有限公司 | Electric quantity information acquisition circuit and equipment |
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| JP2011137681A (en) * | 2009-12-28 | 2011-07-14 | Panasonic Corp | Impedance detection circuit, battery power supply apparatus, and battery utilization system |
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Application publication date: 20130424 |