CN101196540A - Voltage detecting circuit - Google Patents
Voltage detecting circuit Download PDFInfo
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- CN101196540A CN101196540A CNA200710198809XA CN200710198809A CN101196540A CN 101196540 A CN101196540 A CN 101196540A CN A200710198809X A CNA200710198809X A CN A200710198809XA CN 200710198809 A CN200710198809 A CN 200710198809A CN 101196540 A CN101196540 A CN 101196540A
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Abstract
The present invention provides a voltage measuring circuit which includes the following components: an operational amplifier which is functioned with a first reference voltage at one input terminal; a first capacitor which is connected with the other input terminal of the operational amplifier at one end; a second capacitor which has one end connected with the output terminal of the operational amplifier and the other end connected with the other input terminal of the operational amplifier; a switching circuit which can exert the first electric voltage and the second electric voltage on the other end of the first capacitor in sequence; and a discharge circuit which discharges the second capacitor before the function of the second electric voltage on the other end of the first capacitor. The voltage difference between the first electric voltage and the second electric voltage is detected according to the electric voltage of the output terminal of the operational amplifier when the second electric voltage is functioned on the other end of the first capacitor.
Description
The cross-reference of association request
The application advocates the right of priority of the special 2007-070384 of hope of Japanese publication that the special 2006-330783 of hope of the Japanese publication that proposes based on Dec 7th, 2006, on March 9th, 2007 propose, quotes its content in this application.
Technical field
The present invention relates to voltage detecting circuit.
Background technology
In the instruments such as notebook computer that use TunePower,, be necessary voltage with each battery of high Precision Detection in order to manage the charge/discharge of series connected battery.Figure 18 is the figure (spy opens the 2002-243771 communique) of the general structure of expression battery voltage detection circuit.Battery voltage detection circuit 100 is used to detect the voltage of 4 battery BV1～BV4 of series connection, comprises operational amplifier 110, resistance R 1～R4, switch SW 0M～SW4M, SW0P～SW3P, output reference voltage V
REFPower supply 115.In such battery voltage detection circuit 100, detect the voltage V of battery BV4
BV4The time, switch SW 4M, SW3P conducting, other switches disconnect.In view of the above, with the poor corresponding voltage V of the voltage V3 of the terminal of the voltage V4 of the terminal of the positive side of battery BV4 and a negative side
OUTFrom 110 pairs of AD converter of operational amplifier (ADC), 120 outputs.Then, by ADC120 voltage V
OUTBecome digital value, thereby can detect the voltage V of battery BV4
BV4Equally, switch SW 3M, SW2P conducting, other switches disconnect, and can detect the voltage V of battery BV3 thus
BV3In addition, switch SW 2M, SW1P conducting, other switches disconnect, and can detect the voltage V of battery BV2
BV2Switch SW 1M, SW0P conducting, other switches disconnect, thereby can detect the voltage V of battery BV1
BV1
When battery BV1～BV4 used lithium ion battery, the voltage at the two ends of each the battery BV1～BV4 when completely charging reached near the 4.5V.Consider the enough and to spare in the design, if with the voltage V of each battery BV1～BV4
BV1～V
BV4Be made as 5V, just produce the voltage of 20V in series connected battery BV1～BV4 is all, battery voltage detection circuit 100 is necessary for high withstand voltage.On the other hand, the circuit that comprises the control system of ADC120 uses the supply voltage about 3.3V usually, is necessary for below the 3.3V from the voltage of battery voltage detection circuit 100 outputs.
Here, be respectively R3, R4 if establish the resistance value of resistance R 3, R4, the gain G of operational amplifier 110
AMPJust become R4/R3.Therefore, at the voltage V that detects BV4
BV4The voltage V of time output
OUTBecome V
OUT=V
BV4/ G
AMP+ V
REF=(V4-V3) R3/R4+V
REFAnd, if establish V
BV4Be 5V, V
REFBe 0.2V, then be used to become V
OUTThe gain G of the operational amplifier 110 of≤3.3V
AMPCondition become G
AMP≤ (V
OUT-V
REF)/V
BV4=(3.3-0.2)/5 0.6.In view of the above, the gain G of operational amplifier 110
AMPBecome the resistance value of selecting resistance R 3, R4 about 0.6, can make voltage V ADC120 output
OUTBecome below the 3.3V., at this moment, be necessary to make operational amplifier 110, cause that the cost of battery voltage detection circuit 100 rises for high withstand voltage.
Therefore, in order not need to make operational amplifier 110 high withstand voltage, being necessary to make the voltage of effect on the operational amplifier 110 is below the 3.3V.Promptly for make operational amplifier 110+the voltage V that acts on the input terminal
+Below 3.3V, be necessary to satisfy (V3-V
REF) R4/ (R3+R4)+V
REF≤ 3.3.In view of the above, R4/ (R3+R4)≤(3.3-V
REF)/(V3-V
REFThe 3.1/14.8 0.21 of)=(3.3-0.2)/(15-0.2).Therefore, the gain G of operational amplifier 110
AMPBecome G
AMP=R4/R3≤0.21/ (1-0.21) 0.26.Therefore, the resistance value by selecting resistance R 3, R4 is so that the gain G of operational amplifier 110
AMPBecome about 0.26, thereby it is high withstand voltage that operational amplifier 110 is not needed., at this moment, the gain G of the differential amplifier that constitutes by operational amplifier 110
AMPLittle, so to the voltage V of ADC120 input
OUTReduce.Therefore, for the high Precision Detection cell voltage, being necessary to make ADC120 is high precision, thereby causes that cost rises.
In addition, in battery voltage detection circuit 100, when detecting the voltage of battery BV1～BV4, electric current flows to the resistance R 1 that is connected with the input terminal of operational amplifier, R3.Therefore, in order to suppress the discharge of battery BV1～BV4 that this electric current causes, the resistance of resistance R 1, R3 is necessary to use about the number megohm.In addition, for high Precision Detection battery BV1～BV4, being necessary to make resistance R 1～R4 is the little resistor of voltage interdependence of resistance value.When making the integrated circuit that uses the resistance that resistance value is big, the voltage interdependence is little, be necessary to be provided with special step, thereby cause that cost rises.
Summary of the invention
The voltage detecting circuit of a side of the present invention comprises: at the operational amplifier of a side input terminal effect first reference voltage; First capacitor that one end is connected with the opposing party's of described operational amplifier input terminal; One end is connected with the lead-out terminal of described operational amplifier, second capacitor that the other end is connected with the opposing party's of described operational amplifier input terminal; Can be in order first voltage and second voltage on-off circuit in the other end effect of described first capacitor; Described second voltage acts on the other end of described first capacitor before the discharge circuit of described second capacitor discharge; Act on the voltage of the lead-out terminal of the described operational amplifier behind the other end of described first capacitor according to described second voltage, detect the voltage difference of described first voltage and described second voltage.
With the record of this instructions, other features of the present invention become clear with reference to the accompanying drawings.
Description of drawings
For understanding more completely of the present invention and advantage thereof, please with accompanying drawing with reference to the following description.
Fig. 1 is the figure of expression as the structure of the battery voltage detection circuit of the present invention's the 1st embodiment.
Fig. 2 is the figure of the configuration example of the metal line of expression when constituting capacitor by wiring capacitance.
Fig. 3 is the figure of the structure example of expression ADC.
Fig. 4 is the sequential chart of an example of the action of expression battery voltage detection circuit.
The figure of the electric current that Fig. 5 flows through when being the expression switch conduction.
Fig. 6 is expression voltage V
IN, output voltage V
OUT, voltage V
-The figure of an example of variation.
Fig. 7 is the figure of expression from the appearance of the electric current of parasitic diode outflow.
Fig. 8 is the figure of structure of the battery voltage detection circuit of expression the present invention the 2nd embodiment.
Fig. 9 is the sequential chart of an example of the action of expression battery voltage detection circuit.
Figure 10 is the figure of expression as the structure of the battery voltage detection circuit of the present invention's the 3rd embodiment.
Figure 11 is the sequential chart of an example of the action of expression battery voltage detection circuit.
Figure 12 is the figure of structure of the battery voltage detection circuit of expression the present invention the 4th embodiment.
Figure 13 is the sequential chart of an example of the action of expression battery voltage detection circuit.
Figure 14 is the figure of other structure example of expression battery voltage detection circuit.
Figure 15 is the figure that expression detects the structure example of external signal voltage and internal signal voltage.
Figure 16 is the sequential chart of an example of the action of expression voltage detecting circuit.
Figure 17 is the figure of structure example of the voltage detecting circuit of the expression voltage that detects thermistor.
Figure 18 is the figure of the general structure of expression voltage detecting circuit.
Embodiment
According to the record of this instructions and accompanying drawing, Yi Xia item becomes clear at least.
＜＜the 1 embodiment〉〉
==circuit structure==
Fig. 1 is the figure of expression as the structure of the battery voltage detection circuit of the present invention's the 1st embodiment.Battery voltage detection circuit 10A is used to detect the voltage of 4 battery BV1～BV4 of series connection, is the integrated circuit that comprises operational amplifier 20, capacitor C1, C2, C5, switch SW 0～SW5, power supply 30, ON-OFF control circuit 35.
The end of capacitor C1 (first capacitor) and operational amplifier 20-input terminal is connected, and the other end is connected with the end of switch SW 0～SW4.The end of capacitor C2 (second capacitor) is connected with the lead-out terminal of operational amplifier 20, the other end and operational amplifier 20-input terminal is connected.The end of capacitor C5 (the 3rd capacitor) with operational amplifier 20-input terminal is connected other end ground connection.
One end of switch SW 0 is connected with the other end of capacitor C1, and the other end is by terminal V
SSBe connected with the negative terminal of battery.One end of switch SW 1 is connected with the other end of capacitor C1, and the other end is connected with the plus end of battery BV1 and the negative terminal of battery BV2 by terminal V1.One end of switch SW 2 is connected with the other end of capacitor C1, and the other end is connected with the plus end of battery BV2 and the negative terminal of battery BV3 by terminal V2.One end of switch SW 3 is connected with the other end of capacitor C1, and the other end is connected with the plus end of battery BV3 and the negative terminal of battery BV4 by terminal V3.One end of switch SW 4 is connected with the other end of capacitor C1, and the other end is connected with the plus end of battery BV4 by terminal V4.One end of switch SW 5 is connected with the lead-out terminal of operational amplifier 20, the other end and operational amplifier 20-input terminal is connected.In addition, switch SW 0～SW4 is equivalent to on-off circuit of the present invention, and switch SW 5 is equivalent to discharge circuit of the present invention.
ON-OFF control circuit 35 is according to the signal of importing from microcomputer (マ イ コ Application) 45 by terminal SW, the break-make of gauge tap SW0～SW5.In addition, also can realize the function equal by software with ON-OFF control circuit 35.
Here, suppose the situation of battery BV1～BV4 being used lithium ion battery, the voltage V at the two ends of each the battery BV1～BV4 when completely charging
BV1～V
BV4Reach near the 4.5V.Consider the enough and to spare in the design, if establish the voltage V of each battery BV1～BV4
BV1～V
BV4Be 5V, then just produce the voltage of 20V in series connected battery BV1～BV4 is all, capacitor C1 is necessary for high withstand voltage.Therefore, in the present embodiment, generally constitute capacitor C1, C2, C5 by the few wiring capacitance of voltage interdependence.
Fig. 2 is the figure of the configuration example of the metal line of expression when constituting capacitor C1, C2, C5 by wiring capacitance.Here, if the electric capacity of capacitor C1 is 2pF, capacitor C2 electric capacity is 10pF, and then as shown in Figure 2, constituting the metal line C1a of capacitor C1 and the area ratio of the metal line C2a～C2e that constitutes capacitor C2 is 1: 5., for the situation of wiring capacitance,, just can't improve the precision of electric capacity if the situation in the four directions of metal line (four directions) is not same.For example, when not having metal line C5a shown in Figure 2, there are other metal lines in metal line C1a on right side and downside, but does not have other metal lines at upside and left side.On the other hand, there are other metal lines in metal line C2a beyond upside.Therefore, for the situation in the four directions that makes metal line is same, around metal line C1a, C2a～C2e, dispose metal line C5a.This metal line C5a is the illusory metal (illusory wiring) of precision that is used to improve the electric capacity of capacitor C1, C2, and constitutes capacitor C5.
Like this, being used to make the situation in metal line C1a, C2a～C2e four directions by configuration is that same illusory metal is metal line C5a, can improve the precision of the electric capacity of capacitor C1, C2.On the other hand, about this capacitor C5, use as the metal line C5a of the illusory metal of the precision of the electric capacity that is used to improve capacitor C1, C2 and realize, thereby can effectively utilize illusory metal.In other words, the wiring capacitance of capacitor C5 need not be provided for constituting in addition, the chip size of battery voltage detection circuit 10A can be reduced.
Fig. 3 is the figure of the structure example of expression ADC40.ADC40 comprises comparer 50, current source 51, capacitor 52, N-channel MOS FET53, phase inverter 54, counter 55.
Comparer 50 is at+input terminal effect voltage the V from battery voltage detection circuit 10A output
OUT,-input terminal is connected with an end of capacitor 52, and output signal CMP is input to counter 55.Therefore, at voltage V
OUTUnder the higher situation of the voltage of capacitor 52, output signal CMP becomes the H level, at the voltage ratio voltage V of capacitor 52
OUTWhen higher, output signal CMP becomes the L level.
One end of current source 51 is applied in supply voltage V
DD, the other end is connected with an end of capacitor 52, and capacitor 52 is supplied with continuous current.
The drain electrode of N-channel MOS FET53 is connected with an end of capacitor 52, and source ground, to grid, by phase inverter 54 input signal CHG.For example from microcomputer 45 inputs, if signal CHG becomes the L level, then N-channel MOS FET53 just becomes conducting to signal CHG, and capacitor 52 is discharged.
To counter 55 input: from the clock signal clk of the signal CHG of microcomputer 45 outputs, the given frequency that generates from the signal CMP of comparer 50 outputs, by RC oscillatory circuit etc.Then, if signal CHG becomes the H level from the L level, counter 55 just begins the counting of clock signal clk, if signal CMP becomes the L level from the H level, just stops counting.
In output voltage V with the analogue value
OUTBe transformed under the situation of digital value, at first, if signal CHG becomes the H level, microcomputer 45 just begins the counting action of counter 55, and the charging of beginning capacitor 52.Then, capacitor 52 is recharged, if the voltage of capacitor 52 arrives output voltage V
OUT, signal CMP just becomes the L level, stops at the counting action of counter 55.In view of the above, from counter 55, output and output voltage V
OUTCorresponding count value (digital value).
==action==
The action of battery voltage detection circuit 10A is described.Fig. 4 is the sequential chart of an example of the action of expression battery voltage detection circuit 10A.In addition, the voltage that acts on terminal V1～V4 is expressed as V1～V4 respectively.In addition, the voltage with battery BV1～BV4 is expressed as V respectively
BV1～V
BV4
At first, as original state (T0 constantly), switch SW 4, SW5 conducting, switch SW 0～SW3 disconnects.At this moment, switch SW 5 becomes conducting, is 1 amplifier so operational amplifier 20 becomes gain, acts on+reference voltage V of input terminal
REF1=0.8V is as output voltage V
OUTAnd export.In addition, switch SW 4 becomes conducting, so the voltage V of capacitor C1
C1Become V
C1=V4-V
REF1Therefore, if the electric capacity of capacitor C1 is C1, the charge Q of putting aside among the capacitor C1 then
C1Just become Q
C1=V
C1C1=(V4-V
REF1) C1.In addition, switch SW 5 becomes conducting, so the voltage V of capacitor C2
C2Be 0V, the charge Q of savings in capacitor C2
C2Also be 0.
Then, at moment T1, switch SW 4, SW5 become disconnection, and then, at moment T2, switch SW 3 becomes conducting.In view of the above, at the end effect of the capacitor C1 voltage V3 lower than voltage V4, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 3, terminal V3 from the lead-out terminal of operational amplifier 20.
Then, if, just become voltage V at the charge stable of moment T3 capacitor C1
C1=V3-V
REF1, charge Q
C1=V
C1C1=(V3-V
REF1) C1.Therefore, based on the charge Q of electric current I 1
C1Variation delta Q
C1Become Δ Q
C1=(V4-V
REF1) C1-(V3-V
REF1) C1=(V4-V3) C1.Then, by electric current I 1, at capacitor C2 savings and Δ Q
C1With the electric charge of amount, so the charge Q of capacitor C2
C2=(V4-V3) C1.Therefore, the both end voltage V of capacitor C2
C2Become V
C2=(V4-V3) C1/C2=V
BV4C1/C2.And the output voltage of operational amplifier 20 is V
OUT=V
REF1+ V
C2=V
REF1+ V
BV4C1/C2.
Here, C1, C2 are known constants, so microcomputer 45 is got the output voltage V of T0 constantly
OUT(=V
REF1) digital value and the output voltage V during T3 constantly
OUT(
2=V
REF1+ V
BV4C1/C2) digital value poor can be obtained the voltage V of battery BV4
BV4
Then, if become conducting in moment T4 switch SW 5, capacitor C2 is discharge just, V
C2Become 0V, become output voltage V
OUT=V
REF1+ V
C2=V
REF1Then, at moment T5, switch SW 3, SW5 become conducting, follow T6 constantly, and switch SW 2 becomes conducting.In view of the above, at the end effect of the capacitor C1 voltage V2 lower than voltage V3, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 2, terminal V2 from the lead-out terminal of operational amplifier 20.In view of the above, with the voltage V of battery BV3
BV3Corresponding electric charge savings is in capacitor C2, with voltage V
BV4The time can obtain voltage V equally
BV3
Then too, by making switch SW 5 conductings, switch SW 2, SW5 disconnect, and switch SW 1 conducting can obtain the voltage V of battery BV2
BV2By making switch SW 5 conductings, switch SW 1, SW5 disconnect, and switch SW 0 conducting just can obtain the voltage V of battery BV1
RV1
Like this, press the sequential turn-on of switch SW 4, SW3, SW2, SW1, SW1, SW0, thereby carry out the voltage V of battery BV1～BV4
BV1～V
BV4Detection.The figure of the electric current that Fig. 5 flows through when being expression switch SW 1～SW3 conducting.As mentioned above, when pressing the sequential turn-on of switch SW 3, SW2, SW1, electric current I 1 flows to switch SW 3, SW2, SW1 from capacitor C1.Then, detect the voltage V of battery BV1～BV4
BV1～V
BV4After, ON-OFF control circuit 35 is by the sequential turn-on of switch SW 1, SW2, SW3.At first, if switch SW 0 disconnects, switch SW 1 conducting, then with the voltage V of battery BV1
BV1Corresponding electric current I 2 just flows to switch SW 1, capacitor C1 from terminal V1.Then, if switch SW 1 disconnects, switch SW 2 conductings, with the voltage V of battery BV2
BV2Corresponding electric current I 2 just flows to switch SW 2, capacitor C1 from terminal V2.Then, if switch SW 2 disconnects, switch SW 3 conductings, with the voltage V of battery BV3
BV3Corresponding electric current I 2 just flows to switch SW 3, capacitor C1 from terminal V3.
Promptly at A～C point of Fig. 5, offset by outflow based on the electric charge of electric current I 2 based on the inflow of the electric charge of electric current I 1.At battery voltage detection circuit 10A, for example repeat the detection of cell voltage every the several seconds, so offset, can suppress the change of the cell voltage that the detection action of cell voltage causes by the discrepancy that so makes electric charge.
Below, the effect of the capacitor C5 of battery voltage detection circuit 10A is described.Fig. 6 is the voltage V that is illustrated in the end effect of capacitor C1
IN, operational amplifier 20 output voltage V
OUT, operational amplifier 20-the voltage V of input terminal
-The figure of an example of variation.In addition, establish the voltage V of battery BV1～BV4
BV1～V
BV4Be 5V, the electric capacity of capacitor C1 is 2pF, and the electric capacity of capacitor C2 is 10pF, and the electric capacity of capacitor C5 is 20pF, and describes.
Then, if voltage V
-Become negative voltage, as shown in Figure 7, then electric current I 3 just flows to capacitor C1 from parasitic diode 60.If electric current I 3 flows through like this, the quantity of electric charge of putting aside among the capacitor C2 just reduces, and the precision of cell voltage just descends.
Therefore, when capacitor C5 was set as present embodiment, the ratio of the total electric capacity (30pF) of the electric capacity of capacitor C1 (2pF) and capacitor C2, C5 was 1: 15, so voltage V
-Slippage be (20-15) * 1/ (1+15) 0.31.Promptly by capacitor C5 being set, voltage V
-Slippage reduce.Therefore, can suppress voltage V
-Become the generation of the electric current I 3 that negative voltage causes, can prevent that the accuracy of detection of cell voltage from descending.
＜＜the 2 embodiment〉〉
==circuit structure==
Fig. 8 is the figure of structure of the battery voltage detection circuit of expression the present invention the 2nd embodiment.In addition,, pay prosign, omit explanation about the inscape same with the battery voltage detection circuit 10A of the 1st embodiment.
Battery voltage detection circuit 10B, except operational amplifier 20, capacitor C1, C2, C5, switch SW 0～SW5, power supply 30, outside the ON-OFF control circuit 35, also has P channel mosfet 71～75, current source 77, comparer 80, power supply 81, counter 82, power supply 83, switch SW 6.In addition, switch SW 0～SW4, SW6 are equivalent to on-off circuit of the present invention.
Comparer 80 (comparator circuit)+input terminal is connected with the lead-out terminal of operational amplifier 20, in-input terminal effect the reference voltage V from power supply 81 outputs
REF2(second reference voltage).In addition, in the present embodiment, V
REF2=0.7V.Therefore, the output signal CMP of comparer 80 is in the output voltage V of operational amplifier 20
OUTWhen higher, become the H level, in output voltage V than 0.7V
OUTWhen lower, become the L level than 0.7V.
At counter 82, input: from the clock signal clk of the signal CHG of ON-OFF control circuit 35 output, the given frequency that generates from the signal CMP of comparer 80 outputs, by the RC oscillatory circuit.Then, if signal CHG becomes the H level from the L level, counter 82 just begins the counting of clock signal clk, if signal CMP becomes the L level from the H level, just stops counting.
One end of switch SW 6 is connected with the other end of capacitor C1, in the reference voltage V of other end effect from power supply 83 outputs
REF3(the 3rd reference voltage).In addition, in the present embodiment, V
REF3=2.4V.
==action==
Action to battery voltage detection circuit 10B describes.Fig. 9 is the sequential chart of an example of the action of expression battery voltage detection circuit 10B.
At first, as original state (T7 constantly), suppose switch SW 5, SW6 conducting, switch SW 0～SW4 disconnects.At this moment, switch SW 5 becomes conducting, is 1 amplifier so operational amplifier 20 becomes gain, acts on+reference voltage V of input terminal
REF1=0.8V is as output voltage V
OUTAnd export.Therefore, the output signal CMP of comparer 80 becomes the H level.In addition, switch SW 6 becomes conducting, so in the end effect of the capacitor C1 reference voltage V from power supply 83 outputs
REF3
Then, at moment T8, switch SW 5, SW6 become disconnection, and then at moment T9, switch SW 0 becomes conducting.In view of the above, at the end effect ground voltage of capacitor C1, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 0, terminal V from the lead-out terminal of operational amplifier 20
SS, in capacitor C2 savings electric charge, output voltage V
OUTRise.
At moment T10, if the charge stable of capacitor C1, then ON-OFF control circuit 35 just is changed to disconnection to switch SW 0.At this moment, output voltage V
OUTBecome V
OUT=V
REF1+ V
REF3C1/C2.At moment T10, if ON-OFF control circuit 35 becomes the H level to signal CHG, then P channel mosfet 75 just becomes disconnection, and continuous current I4 flows to the lead-out terminal of capacitor C2, operational amplifier 20 from P channel mosfet 74.By this continuous current I4, the electric charge of savings in capacitor C2 discharges output voltage V with constant speed
OUTDescend with constant speed.In addition, signal CHG becomes the H level, the counting of counter 82 beginning clock signal clks.
Then, if in moment T11, output voltage V
OUTBe reduced to comparer 80-reference voltage V that acts on the input terminal
REF2Be 0.7V, then the output signal CMP of comparer 80 becomes the L level, and counter 82 stops counting.Then, by the time T of the moment T10～T11 of counter 82 counting
REF3Become and reference voltage V
REF3The time corresponding of (=2.4V).If promptly from the output voltage V between T10～T11
OUTSlope be-1/K just to become T
REF3=K (V
REF1+ V
REF3C1/C2-V
REF2)=K (V
REF3C1/C2+0.1).Then, at moment T12, if ON-OFF control circuit 35 becomes the L level to signal CHG, P channel mosfet 75 just becomes conducting, stops the discharge based on the capacitor C2 of continuous current I4.In addition, ON-OFF control circuit 35 at moment T12, becomes conducting to switch SW 4, SW5.Then, switch SW 5 becomes conducting, thus output voltage V
OUTBecome reference voltage V
REF1=0.8V, and the output signal CMP of comparer 80 becomes the H level.In addition, switch SW 4 becomes conducting, at the end effect voltage V4 of capacitor C1.
Then, at moment T13, switch SW 4, SW5 become disconnection, and then, at moment T14, switch SW 3 becomes conducting.In view of the above, at the end effect of the capacitor C1 voltage V3 lower than voltage V4, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 3, terminal V3 from the lead-out terminal of operational amplifier 20, puts aside electric charge on capacitor C2, voltage V
OUTRise.
At moment T15, if the charge stable of capacitor C1, ON-OFF control circuit 35 just is changed to disconnection with switch SW 3.At this moment, output voltage V
OUTBecome V
OUT=V
REF1+ V
BV4C1/C2.In addition, if ON-OFF control circuit 35 becomes the H level to signal CHG at moment T15, then P channel mosfet 75 becomes disconnection, and continuous current I4 flows to the lead-out terminal of capacitor C2, operational amplifier 20 from P channel mosfet 74.By this continuous current I4, the electric charge of savings in capacitor C2 discharges output voltage V with constant speed
OUTDescend with constant speed.In addition, signal CHG becomes the H level, thus the counting of counter 82 beginning clock signal clks.
Then, if in moment T16, output voltage V
OUTBe reduced to comparer 80-reference voltage V that acts on the input terminal
REF2Be 0.7V, the output signal CMP of comparer 80 becomes the L level, and counter 82 stops counting.Then, by the time T of the moment T15～T16 of counter 82 counting
BV4Become and reference voltage V
BV4Time corresponding.If promptly from the output voltage V between T15～T16
OUTSlope be-1/K just to become T
BV4=K (V
REF1+ V
BV4C1/C2-V
REF2)=K (V
BV4C1/C2+0.1).
So microcomputer 45 is according to the T by counter 82 instrumentations
REF3, T
BV4, can obtain the voltage V of battery BV4
BV4Particularly, become V
BV4=(C2/C1) (T
BV4-T
REF3)/K+V
REF3Pass through reference voltage V
REF3The time count value T
REF3Voltage V with battery BV4
BV4The time count value T
BV4Contrast, obtain voltage V
BV4Thereby, can improve the accuracy of detection of cell voltage.For example, under the situation of clock signal clk by the low circuit generation of precision such as RC oscillatory circuit, only according to T by counter 82 instrumentations
BV4, obtain the voltage V of battery BV4
BV4, then because the influence of the variation of the clock frequency that temperature variation etc. causes, voltage V
BV4Accuracy of detection can descend.Therefore, as present embodiment, by with given reference voltage V
REF3The time count value T
REF3Contrast, the influence that the variation of energy offset clock frequency causes can be with the voltage V of high Precision Detection battery BV4
BV4
In addition, same with the 1st embodiment after moment T16, on one side gauge tap SW0～SW5, on one side with the described discharge of carrying out equally based on the continuous current of electric current I 4, can detect the voltage V of battery BV1～BV4
BV1～V
BV3
＜＜the 3 embodiment〉〉
==circuit structure==
Figure 10 is the figure of structure of the battery voltage detection circuit of expression the present invention the 3rd embodiment.Battery voltage detection circuit 10C shown in Figure 10 is the circuit that the battery voltage detection circuit 10C of the 1st embodiment is become difference structure.In addition, capacitor C6 is provided with in order to finish with the same function of capacitor C5.In addition, the relation of supposing C1/C2=C3/C4 is set up.In addition, same with the 1st embodiment in the present embodiment, constitute capacitor C1～C6 by wiring capacitance.In addition, capacitor C1～C5 is equivalent to first～the 5th capacitor of the present invention respectively, switch SW 0P～switch SW 3P, SW1M～SW4M, SW6M, SW6P, SW7 are equivalent to on-off circuit of the present invention, and switch SW 5M, SW5P are equivalent to discharge circuit of the present invention.
==action==
Action to battery voltage detection circuit 10C describes.Figure 11 is the sequential chart of an example of the action of expression battery voltage detection circuit 10C.
At first, at moment T0, switch SW 4M, SW3P, SW6M, SW6P, SW5M, SW5P conducting, switch SW 0P～SW2P, SW1M～SW3M, SW7 become disconnection.At this moment, because switch SW 5M, SW5P conducting, be 1 amplifier so operational amplifier 20 becomes gain, act on+reference voltage V of input terminal
REF1=0.8V is as output voltage V
OUTOutput.In addition, because switch SW 4M, SW6M conducting, so the voltage V of capacitor C1
C1Become V
C1=V4-V
REF1Therefore, the charge Q of putting aside among the capacitor C1
C1Just become Q
C1=V
C1C1=(V4-V
REF1) C1.In addition, switch SW 5M becomes conducting, so the voltage V of capacitor C2
C2Be 0V, the charge Q of savings in capacitor C2
C2Also be 0.In addition, switch SW 3P, SW6P become conducting, so the voltage V of capacitor C3
C3Become V
C3=V3-V
REF1Therefore, the charge Q of putting aside among the capacitor C3
C3Become Q
C3=V
C3C3=(V3-V
REF1) C3.In addition, switch SW 5P becomes conducting, so the voltage V of capacitor C4
C4Be 0V, the charge Q of savings in capacitor C4
C4Also be 0.
Then, at moment T1, switch SW 5M, SW5P become disconnection, and then, at moment T2, switch SW 6M becomes disconnection, and switch SW 7 becomes conducting.In view of the above, at the other end effect of the capacitor C1 voltage V3 lower than voltage V4, from the lead-out terminal of operational amplifier 20, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 7, switch SW 3P, terminal V3.
Then, if, then become voltage V at the charge stable of moment T3 capacitor C1
C1=V3-V
REF1, charge Q
C1=V
C1C1=(V3-V
REF1) C1.Therefore, based on the charge Q of electric current I 1
C1Variation delta Q
C1Become Δ Q
C1=(V4-V
REF1) C1-(V3-V
REF1) C1=(V4-V3) C1.Then, by electric current I 1, at capacitor C2 savings and Δ Q
C1With the electric charge of amount, so the charge Q of capacitor C2
C2=(V4-V3) C1.Therefore, the both end voltage V of capacitor C2
C2Become V
C2=(V4-V3) C1/C2=V
BV4C1/C2.In addition, the charge Q of putting aside among the capacitor C4
C4Be 0V, thus act on operational amplifier 20+voltage V on the input terminal
+Become V
REF1, act on the voltage V on the operational amplifier 20
-Become V
-=V
+=V
REF1Therefore, the output voltage V of operational amplifier 20
OUT=V
REF1+ V
C2=V
REF1+ V
BV4C1/C2.
Here, C1, C2 are known constants, so the output voltage V when microcomputer 45 is got T0 constantly
OUT(=V
REF1) digital value and the output voltage V during T3 constantly
OUT(
2=V
REF1+ V
BV4C1/C2) digital value poor can be obtained the voltage V of battery BV4
BV4
In addition, when for example battery BV1～BV4 being used as the driving power of notebook computer, when handling load and increase, voltage V1～V4 same degree that descends simultaneously sometimes.If produce the phenomenon that voltage V3 drops to V3 ' at moment T4, the voltage that acts on the other end of capacitor C1 just drops to V3 ' from V3, so from the lead-out terminal of operational amplifier 20, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 7, switch SW 3P, terminal V3.In addition, the voltage that acts on the other end of capacitor C3 also drops to V3 ' from V3, so electric current I 2 flows to capacitor C4, capacitor C3, switch SW 6P, switch SW 3P, terminal V3 from power supply 30.
Charge Q based on electric current I 2
C3Variation delta Q
C3Become Δ Q
C3=(V3-V3 ') C3.Then, by electric current I 2, at capacitor C4 savings and Δ Q
C4With the electric charge of amount, Δ Q
C4=(V3-V3 ') C3.Therefore, the both end voltage V of capacitor C4
C4Become V
C4=(V3-V3 ') C3/C4, act on operational amplifier 20+voltage V on the input terminal
+Become V
REF1-V
C4In addition, based on the charge Q of electric current I 1
C1Variation delta Q
C1Become Δ Q
C1=(V3-V3 ') C1.Then, by electric current I 1, further put aside and Δ Q at capacitor C2
C1With the electric charge of amount, so capacitor C2 charge Q
C2Become Q
C2=(V4-V3) C1+ (V3-V3 ') C1=(V4-V3 ') C1.Therefore, the voltage V at the two ends of capacitor C2
C2Become V
C2=(V4-V3 ') C1/C2.In addition, act on operational amplifier 20-the voltage V of input terminal
-Become V
-=V
+=V
REF1-V
C4=V
REF1-(V3-V3 ') C3/C4.Therefore, the output voltage V of operational amplifier 20
OUTBecome V
OUT=V
REF1-(V3-V3 ') and C3/C4+ (V4-V3 ') C1/C2=V
REF1(V4-V3) C1/C2=V
REF1+ V
BV4C1/C2 is identical during with moment T3.
The same degree even voltage V1～V4 descends simultaneously, switch SW 7 becomes conducting, thereby operational amplifier 20 ± variable quantity of the voltage of input terminal is same degree, output voltage V
OUTConstant, can not rely on periodically voltage V with high Precision Detection battery BV4
BV4
Then, at moment T5, if switch SW 5M, SW5P become conducting, capacitor C2, C4 be discharge just, V
C2, V
C4Become 0V, output voltage V
OUT=V
REF1Then, at moment T5, switch SW 4M, SW3P, SW7 become disconnection, and switch SW 3M, SW6M, SW2P become conducting.By this, at the other end effect of the capacitor C3 voltage V2 lower than voltage V3, electric current I 2 flows to switch SW 5P, capacitor C3, switch SW 6P, switch SW 2P, terminal V2 from power supply 30.At moment T6, switch SW 5M, switch SW 5P become disconnection then, and then, at moment T7, switch SW 6M becomes disconnection, and switch SW 7 becomes conducting.In view of the above, at the other end effect of the capacitor C1 voltage V2 lower than voltage V3, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 7, switch SW 2P, terminal V2 from the lead-out terminal of operational amplifier 20.In view of the above, with the voltage V of battery BV2
BV2Corresponding electric charge is put aside in capacitor C2, with voltage V
BV4Situation can obtain voltage V equally
BV3In addition, for example at moment T9, the same degree even voltage V1～V4 descends simultaneously, switch SW 7 becomes conducting, thereby operational amplifier 20 ± variable quantity of the voltage of input terminal is same degree, output voltage V
OUTConstant.
Then too, make switch SW 5M, SW5P conducting, switch SW 3M, SW2P, SW7 are disconnected, make SW2M, SW6M, SW1P conducting, SW5M, SW5P are disconnected, SW6M is disconnected, make the SW7 conducting, thereby can obtain the voltage V of battery BV2
BV2In addition, make switch SW 5M, SW5P conducting, switch SW 2M, SW1P, SW7 are disconnected, make SW1M, SW6M, SWOP conducting, switch SW 5M, SW5P are disconnected, SW6M is disconnected, make the SW7 conducting, thereby can obtain the voltage V of battery BV1
BV1
So, the other end at capacitor C1 acts on voltage V4, V3, V2, V1, V in order
SS, act on voltage V3, V2, V1, V in order at the other end of capacitor C3
SS, carry out the voltage V of battery BV1～BV4
BV1～V
BV4Detect.As mentioned above, the voltage of the other end that acts on capacitor C1 is when V4 drops to V3, and electric current I 1 flows out from terminal V3.Equally, the voltage of the other end that acts on capacitor C1 is when V3 drops to V2, and electric current I 1 flows out from terminal V2, and when V2 dropped to V1, electric current I 1 flowed out from terminal V1.In addition, the voltage of the other end that acts on capacitor C3 is when V3 drops to V2, and electric current I 2 flows out from terminal V2, and when V2 dropped to V1, electric current I 2 flowed out from terminal V1.
So, the voltage V of detection battery BV1～BV4
BV1～V
BV4After, ON-OFF control circuit 35 acts on voltage V1, V2, V3 in order at the other end of capacitor C1, for example gauge tap circuit SW1M～SW3M, SW6M act on voltage V1, V2 in order at the other end of capacitor C3, for example gauge tap circuit SW1P, SW2P, SW6P.For example, if by making switch SW 1M, SW6M become conducting, and at the other end effect voltage V1 of capacitor C1, then at the voltage of the other end effect of capacitor C1 just from V
SSBecome V1, with the voltage V of battery BV1
BV1Corresponding electric current flows into from terminal V1.In addition, if for example by making switch SW 1P, SW6P become conducting, and at the other end effect voltage V1 of capacitor C3, then at the voltage of the other end effect of capacitor C3 just from V
SSBecome V1, with the voltage V of battery BV1
BV1Corresponding electric current flows into from terminal V1.If promptly observe, offset because of outflow by the electric charge that electric current I 1, I2 flow into from terminal V1.About terminal V2, V3, too, offset because of outflow by the electric charge that electric current I 1, I2 flow into.In battery voltage detection circuit 10C, owing to for example repeat the detection action of cell voltage,, can suppress the change of the cell voltage that the detection action of cell voltage causes so so offset by the discrepancy of electric charge every the several seconds.
＜＜the 4 embodiment〉〉
==circuit structure==
Figure 12 is the figure of structure of the battery voltage detection circuit of expression the present invention the 4th embodiment.Battery voltage detection circuit 10D shown in Figure 12 becomes the battery voltage detection circuit 10D of the 2nd embodiment in the circuit of difference structure.In addition, switch SW 0P～switch SW 3P, SW1M～SW4M, SW6M, SW6P, SW7, SW8M are equivalent to discharge circuit of the present invention.
==action==
Action to battery voltage detection circuit 10D describes.Figure 13 is the sequential chart of an example of the action of expression battery voltage detection circuit 10D.
At first, at moment T11, switch SW 5M, SW5P, SW8M, SW0P, SW6P conducting, switch SW 1M～SW4M, SW1P～SW3P, SW6P, SW7 become disconnection.At this moment, because switch SW 5M, SW5P become conducting, be 1 amplifier so operational amplifier 20 becomes gain, act on+reference voltage V of input terminal
REF1=0.8V is as output voltage V
OUTOutput.Therefore, the output signal CMP of comparer 80 becomes the H level.In addition, switch SW 8M becomes conducting, so in the end effect of the capacitor C1 reference voltage V from power supply 83 outputs
REF3, switch SW 0P, SW6P become conducting, so at the other end effect ground voltage V of capacitor C3
SS
Then, at moment T12, switch SW 5M, SW5P become disconnection, and then at moment T13, switch SW 8M becomes disconnection, and switch SW 7 becomes conducting.In view of the above, at the other end effect ground voltage V of capacitor C1
SS, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 7, switch SW 0P, terminal V from the lead-out terminal of operational amplifier 20
SS, in capacitor C2 savings electric charge, output voltage V
OUTRise.
If the charge stable of capacitor C1, at moment T14, ON-OFF control circuit 35 just disconnects switch SW 0P, switch SW 7.At this moment, output voltage V
OUTBecome V
OUT=V
REF1+ V
REF3C1/C2.At moment T14, if ON-OFF control circuit 35 becomes the H level to signal CHG, P channel mosfet 75 just disconnects, and continuous current I4 flows from the lead-out terminal of P channel mosfet 74 to capacitor C2, operational amplifier 20.By this continuous current I4, the electric charge of savings in capacitor 26 discharges output voltage V with constant speed
OUTDescend with constant speed.In addition, signal CHG becomes the H level, the counting of counter 82 beginning clock signal clks.
Then, if in moment T15, output voltage V
OUTBe reduced to comparer 80-reference voltage V that acts on the input terminal
REF20.7V, the output signal CMP of comparer 80 becomes the L level, counter 82 stop the counting.Then, by the time T of the moment T14～T15 of counter 82 counting
REF3Become and reference voltage V
REF3The time corresponding of (=2.4V).If promptly establish the output voltage V between T14～T15
OUTSlope be-1/K just to become T
REF3=K (V
REF1+ V
REF3C1/C2-V
REF2)=K (V
REF3C1/C2+0.1).Then, at moment T16, if ON-OFF control circuit 35 becomes the L level to signal CHG, then P channel mosfet 75 just becomes conducting, stops the discharge based on the capacitor 26 of continuous current I4.And ON-OFF control circuit 35 becomes conducting to switch SW 4M, SW3P, SW6M, SW6P, SW5M, SW5P at moment T16.Then, switch SW 5M, SW5P become conducting, output voltage V
OUTBecome reference voltage V
REF1=0.8V, and the output signal CMP of comparer 80 becomes the H level.In addition, switch SW 4M, SW6M become conducting, thereby at the end effect voltage V4 of capacitor C1, switch SW 3P, SW6P become conducting, at the other end effect voltage V3 of capacitor C3.
Then, at moment T17, switch SW 5M, SW5P become disconnection, and then, at moment T18, switch SW 6M becomes disconnection, and switch SW 7 becomes conducting.In view of the above, at the other end effect of the capacitor C1 voltage V3 lower than voltage V4, electric current I 1 flows to capacitor C2, capacitor C1, switch SW 7, switch SW 3P, terminal V3 from the lead-out terminal of operational amplifier 20, and puts aside electric charge, output voltage V in capacitor C2
OUTRise.
In addition, at moment T19, behind the charge stable of capacitor C1, for example owing to handle the increase etc. of electric charge, voltage V1～V4 descends with degree ground simultaneously, and switch SW 7 just becomes conducting, operational amplifier 20 ± variable quantity of the voltage of input terminal is same degree, output voltage V
OUTConstant.
Then, at moment T20, ON-OFF control circuit 35 is changed to disconnection with switch SW 4M, SW3P, SW7.At this moment, output voltage V
OUTBecome V
OUT=V
REF1+ V
BV4C1/C2.If ON-OFF control circuit 35 becomes the H level to signal CHG at moment T20, P channel mosfet 75 becomes disconnection, and continuous current I4 flows to the lead-out terminal of capacitor C2, operational amplifier 20 from P channel mosfet 74.By this continuous current I4, the electric charge of savings in capacitor C2 discharges output voltage V with constant speed
OUTDescend with constant speed.In addition, signal CHG becomes the H level, the counting of counter 82 beginning clock signal clks.
Then, if in moment T21, output voltage V
OUTBe reduced to comparer 80-reference voltage V that acts on the input terminal
REF20.7V, the output signal CMP of comparer 80 becomes the L level, counter 82 stop the counting.Then, by the time T of the moment T20～T21 of counter 82 counting
BV4Become and reference voltage V
BV4Time corresponding.If promptly establish from the output voltage V between T20～T21
OUTSlope be-1/K just to become T
BV4=K (V
REF1+ V
BV4C1/C2-V
REF2)=K (V
BV4C1/C2+0.1).
So microcomputer 45 is according to the T by counter 82 instrumentations
REF3, T
BV4, can obtain the voltage V of battery BV4
BV4Particularly, become V
BV4=(C2/C1) (T
BV4-T
REF3)/K+V
REF3Like this, by with reference voltage V
REF3The time count value T
REF3Voltage V during with battery BV4
BV4The time count value T
BV4Compare, and obtain voltage V
BV4Thereby, can improve the accuracy of detection of cell voltage.For example, when clock signal clk is generated by the low circuit of precision such as RC oscillatory circuit, only according to T by counter 82 instrumentations
BV4, obtain the voltage V of battery BV4
BV4, just because the influence of the variation of the clock frequency that temperature variation etc. cause, voltage V
BV4Accuracy of detection descend.Therefore, as present embodiment, by with given reference voltage V
REF3The time count value T
REE3Contrast, the influence that the variation of energy offset clock frequency causes can be with the voltage V of high Precision Detection battery BV4
BV4
In addition, after moment T22, same with the 3rd embodiment, on one side gauge tap SW0P～SW3P, SW5P, SW6P, SW1M～SW6M, SW7, on one side and the described discharge of carrying out equally based on the continuous current of electric current 14, thus can detect the voltage V of battery BV1～BV4
BV1～V
BV4
More than, embodiments of the invention have been described.As mentioned above, in battery voltage detection circuit 10A～10D, carry out differential amplification, rather than use resistance, use C1～C4 in order to use operational amplifier 20.Therefore, operational amplifier 20 is not acted on the DC voltage of battery BV1～BV4, operational amplifier 20 need not be high withstand voltage.And, by adjusting the capacity ratio of capacitor C1～C4, can improve output voltage V
OUTVoltage level, so need not use high-precision AD converter.Therefore, can with low-cost, detect cell voltage accurately.
In addition, compare when carrying out differential amplification, can reduce the quantity of electric charge that flows out from battery with use resistance.In the battery voltage detection circuit 100 of Figure 18, be 5M Ω for example if establish the resistance value of resistance R 1, R3, the voltage V of battery BV4
BV4Be 5V, the conversion time of ADC120 is 30ms, is accompanied by voltage V
BV4Detection and the quantity of electric charge that flows out becomes Q=IT=5V/10M Ω * 30ms=15 μ C.And in battery voltage detection circuit 10A～10D, if establish the voltage V that the electric capacity of capacitor C1 is 2pF, battery BV1～BV4
BV1～V
BV4Be 5V, then the quantity of electric charge that flows out when switch SW 4 conductings just becomes Q=CV=2pF * 20V=40pc=0.000040 μ C, compares with the situation of battery voltage detection circuit 100, and is overwhelmingly little.In addition, in battery voltage detection circuit 100, through behind the conversion time of ADC120, as long as switch SW 4M, SW3P become conducting, electric charge just continues to flow out, but in battery voltage detection circuit 10A～10D, after the capacitor C1 charging, electric charge does not flow out.Therefore, in battery voltage detection circuit 10A～10D, can suppress the battery consumption that the detection action of cell voltage causes.
In addition, in battery voltage detection circuit 10A～10D, by capacitor C5 is set, operational amplifier 20-the voltage V of input terminal
-Slippage reduce, can suppress to take place from the electric current of parasitic diode 60, can prevent that the accuracy of detection of cell voltage from descending.And, voltage V
-Slippage increase according to the amplifier gain C1/C2 of operational amplifier 20, but by increasing the electric capacity of capacitor C5, can reduce voltage V
-Slippage, so can increase amplifier gain C1/C2.Can increase amplifier gain C1/C2, output voltage V
OUTBecome high voltage, can improve the accuracy of detection of cell voltage.
In addition, in battery voltage detection circuit 10B, 10D, the electric charge of putting aside among the capacitor C2 by continuous current I4 discharge, is detected cell voltage.Promptly for the situation of battery voltage detection circuit 10B, 10D, capacitor C2 diverts and is the part of AD converter.In view of the above, need not be arranged on the capacitor 52 that necessitates among the ADC40 shown in Figure 3 in addition, can cutting down cost.For the situation of ADC40, if capacitor 52 chargings, voltage rises, because the variation of the both end voltage of current source 51 is producing error sometimes from the continuous current of current source 51 outputs.On the other hand, in battery voltage detection circuit 10B, 10D, the voltage of the other end of capacitor C2 (operational amplifier 20-input terminal) is constant, so be accompanied by the process of discharge time, in continuous current I4, do not produce error, can be with the high Precision Detection cell voltage.
In addition, in battery voltage detection circuit 10B, 10D, compare voltage V with battery BV1～BV4
BV1～V
BV4Corresponding instrumentation time and reference voltage V
REF3The corresponding instrumentation time, detect voltage V
BV1～V
BV4In view of the above, even clock frequency changes because of temperature variation etc., also can be with high Precision Detection voltage V
BV1～V
BV4Therefore, can use oscillatory circuit cheaply such as RC oscillatory circuit, and can with low-cost, detect cell voltage accurately.
In addition, in battery voltage detection circuit 10A～10D, constitute capacitor C1 by wiring capacitance.Wiring capacitance is compared with other electric capacity, and general voltage interdependence is few, so can be with the high Precision Detection cell voltage.In addition, big with the configuration resistance value, the situation difference of the resistance that the voltage interdependence is little can be diverted the step that has existed, and can suppress the increase of cost.
In addition, in battery voltage detection circuit 10A～10D, constitute capacitor C1, C2, be used to improve the illusory metal formation capacitor C5 of the electric capacity precision of capacitor C1, C2 by wiring capacitance.Capacitor C5 is used to suppress the voltage V of operational amplifier 20-input terminal
-Decline, the precision of electric capacity does not influence the accuracy of detection of cell voltage.Therefore, constitute capacitor C5, can effectively utilize illusory metal, compare, can reduce chip size with the situation that capacitor C5 is set in addition by using illusory metal.
In addition, in battery voltage detection circuit 10A, 10B, by from the hot side of series connected battery BV1～BV4 to low potential side, in order switch SW 0～SW4 is become conducting, voltage V that can efficient detection battery BV1～BV4
BV1～V
BV4Equally, by from low potential side to hot side, in order switch SW 0～SW4 is become conducting, can efficient detection the voltage V of battery BV1～BV4
BV1～V
BV4
In addition, in battery voltage detection circuit 10A, 10B, after low potential side becomes conducting to switch SW 0～SW4 in order, in order switch SW 1～SW3 is become conducting to hot side from low potential side from hot side.Therefore, as shown in Figure 5, by based on the outflow of the electric charge of electric current I 2 and the change of the cell voltage in the time of suppressing to carry out the detection of cell voltage is repeatedly offset in the inflow based on the electric charge of electric current I 1.
In addition, in battery voltage detection circuit 10C, 10D, even owing to handle the increase of load, voltage V1～V4 same degree that descends simultaneously, switch SW 7 becomes conducting, operational amplifier 20 ± variable quantity of the voltage of input terminal becomes identical.Therefore, under these circumstances, output voltage V
OUTDo not change, can be with the high Precision Detection cell voltage.
In addition, in battery voltage detection circuit 10C, 10D, from series connected battery BV1～BV4 hot side to low potential side in order to capacitor C1, C3 effect, voltage V that can efficient detection battery BV1～BV4
BV1～V
BV4Equally, from low potential side to hot side in order to capacitor C1, C3 effect, can be with the voltage V of efficient detection battery BV1～BV4
BV1～V
BV4
In addition, in battery voltage detection circuit 10C, 10D, from hot side after low potential side is in order to capacitor C1, C3 effect, from low potential side to hot side in order to capacitor C1, C3 effect.Therefore, can offset inflow, the change of the cell voltage in the time of suppressing to carry out the detection of cell voltage repeatedly based on the electric charge of electric current I 1, I2.
More than, described inventive embodiment is used for understanding of the present invention is become easily, is not to be used for limited interpretation the present invention.The present invention can change, improve under the prerequisite that does not break away from its aim, and comprises its equivalent in the present invention.
For example, in battery voltage detection circuit 10A～10D, detect the voltage of a plurality of battery BV1～BV4 of series connection, a plurality of but the quantity of the battery of detected object is not limited to, as shown in figure 14, also can constitute and detect the voltage detecting circuit 10E of voltage arbitrarily.
In addition, in battery voltage detection circuit 10A～10E, be as cell voltage, but be not limited to cell voltage, in detecting the voltage detecting circuit of voltage arbitrarily, can use the present invention the voltage of detected object.
For example, voltage detecting circuit 10F shown in Figure 15 also comprises switch SW 7 except the structure of battery voltage detection circuit 10B shown in Figure 8.And, in voltage detecting circuit 10F, can detect the external signal voltage 1～4 (first voltage) of LSI (Large Scale Integration) 90 outputs or the internal signal voltage V that generates in the inside of voltage detecting circuit 10F from the outside that is positioned at voltage detecting circuit 10F
INT(first voltage) with ground voltage V
SS(second voltage) is the voltage of benchmark.In addition, if when LSI190 is the driving circuit of 4 motors, external signal voltage 1～4 is exactly the voltage corresponding with the rotational speed of each motor.In addition, internal signal voltage V
INTBe according to the voltage of the temperature characterisitic variation of the forward voltage that is arranged on the diode in the voltage detecting circuit 10F, when detecting the temperature of voltage detecting circuit 10F, use.Figure 16 is the sequential chart of an example of the action of expression voltage detecting circuit 10F.About moment T7～moment T13, identical during with battery voltage detection circuit 10B shown in Figure 9.At moment T12～moment T13, behind capacitor C1 effect external signal voltage 4 (V4), at moment T14, switch SW 0 becomes conducting, thereby at capacitor C1 effect ground voltage V
SSAfter, output voltage V
OUTThe ground voltage that becomes with outside signal voltage 4 (V4) is the voltage of benchmark.Then, with the time T of counter 82 instrumentations from moment T15～moment T16
V4, can detect ground voltage V with outside signal voltage 4 (V4)
SSVoltage for benchmark.Equally, about external signal voltage 1～3 (V1～V3) and internal signal voltage V
INT, can detect with ground voltage V
SSVoltage for benchmark.
In addition, voltage detecting circuit 10G for example shown in Figure 17 becomes the structure identical with battery voltage detection circuit 10D shown in Figure 12.And, at the terminal V of voltage detecting circuit 10G
SS, connect thermistor TH1 between the V1, between terminal V1, V2, connect thermistor TH2, between terminal V2, V3, connect thermistor TH2, between terminal V3, V4, connect resistance R, at terminal V4 effect supply voltage V
DDIn such voltage detecting circuit 10G,, can detect the voltage (voltage difference) between thermistor TH1～TH4 and resistance R two ends separately by the action same with the situation of battery voltage detection circuit 10D.
Claims (15)
1. a voltage detecting circuit is characterized in that, comprising:
Operational amplifier is applied in first reference voltage on the input terminal of one side;
First capacitor, the one end is connected with the opposing party's of described operational amplifier input terminal;
Second capacitor, the one end is connected with the lead-out terminal of described operational amplifier, and the other end is connected with the opposing party's of described operational amplifier input terminal;
On-off circuit, it can be in order be applied to the other end of described first capacitor to first voltage and second voltage;
Discharge circuit, it made described second capacitor discharge before described second voltage is applied in the other end of described first capacitor;
Be applied in the voltage of the lead-out terminal of the described operational amplifier behind the other end of described first capacitor according to described second voltage, detect the voltage difference of described first voltage and described second voltage.
2. voltage detecting circuit according to claim 1 is characterized in that,
Also have:
The 3rd capacitor, the one end is connected with the opposing party's of described operational amplifier input terminal, other end ground connection.
3. voltage detecting circuit according to claim 1 is characterized in that,
Also have:
Constant-current circuit, it exports the steady current that the electric charge of putting aside in described second capacitor is discharged with given speed in response to the discharge commencing signal of input;
Comparator circuit, it exports the voltage of lead-out terminal of described operational amplifier and the comparative result of second reference voltage;
Counting circuit, it begins counting in response to described discharge commencing signal, and based on the described comparative result from the output of described comparator circuit, reaches under the situation of second reference voltage at the voltage of the lead-out terminal of described operational amplifier, stops counting.
4. voltage detecting circuit according to claim 3 is characterized in that,
Described on-off circuit can apply the 3rd reference voltage at the other end of described first capacitor.
5. voltage detecting circuit according to claim 1 is characterized in that,
Described voltage detecting circuit is an integrated circuit,
Described first capacitor is the wiring capacitance that the wiring by described integrated circuit constitutes.
6. voltage detecting circuit according to claim 2 is characterized in that,
Described voltage detecting circuit is an integrated circuit,
Described first capacitor and described second capacitor are the wiring capacitances that the wiring by described integrated circuit constitutes, and described the 3rd capacitor is made of the illusory wiring of the electric capacity precision that improves described first and second capacitors.
7. voltage detecting circuit according to claim 1 is characterized in that,
Described on-off circuit can be applied to the wherein voltage of a side terminal of first battery that is connected in series and second battery other end of described first capacitor,
Also have:
ON-OFF control circuit, it carries out the discharge of described second capacitor in order in order to make, apply to described first capacitor described first battery a side terminal voltage and apply a side the voltage of terminal of described second battery to described first capacitor after, carry out the discharge of described second capacitor more in order and apply the opposing party's of described second battery the voltage of terminal to described first capacitor, and control described discharge circuit and described on-off circuit.
8. voltage detecting circuit according to claim 7 is characterized in that,
Described ON-OFF control circuit in order to make behind the voltage of the opposing party's who applies terminal from described second battery to described first capacitor, to be carried out the voltage of terminal that applies a side of described second battery to described first capacitor again, and is controlled described on-off circuit.
9. voltage detecting circuit according to claim 1 is characterized in that,
One end of described first capacitor is connected with a side's of described operational amplifier input terminal;
One end of described second capacitor is connected with the lead-out terminal of described operational amplifier, and the other end is connected with a side's of described operational amplifier input terminal;
Also have:
The 3rd capacitor, the one end is connected with the opposing party's of described operational amplifier input terminal;
The 4th capacitor, the one end is applied in first reference voltage, and the other end is connected with the opposing party's of described operational amplifier input terminal,
Described on-off circuit applies described first voltage at the other end of described first capacitor, after the other end of described the 3rd capacitor applies described second voltage, can apply described second voltage at the other end of described first capacitor and described the 3rd capacitor,
Described discharge circuit made the discharge of described second capacitor and described the 4th capacitor before the other end of described first capacitor and described the 3rd capacitor applies described second voltage,
According to described first and the voltage of the lead-out terminal of the other end of the 3rd capacitor described operational amplifier after applying described second voltage, detect the voltage difference of described first voltage and described second voltage.
10. voltage detecting circuit according to claim 9 is characterized in that,
Have: the terminal that is applied in described first voltage;
Be applied in the terminal of described second voltage.
11. voltage detecting circuit according to claim 9 is characterized in that,
Also have:
The 5th capacitor, the one end is connected other end ground connection with a side's of described operational amplifier input terminal.
12. voltage detecting circuit according to claim 9 is characterized in that,
Described voltage detecting circuit is an integrated circuit,
Described first capacitor and described the 3rd capacitor are the wiring capacitances that the wiring by described integrated circuit constitutes.
13. voltage detecting circuit according to claim 11 is characterized in that,
Described voltage detecting circuit is an integrated circuit,
Described first capacitor～described the 4th capacitor is the wiring capacitance that the wiring by described integrated circuit constitutes, and described the 5th capacitor is formed by the illusory wiring of the electric capacity precision that improves described first capacitor～described the 4th capacitor.
14. voltage detecting circuit according to claim 9 is characterized in that,
Described on-off circuit can be applied to the wherein voltage of a side terminal of first battery that is connected in series and second battery other end of described first capacitor and described the 3rd capacitor;
Also have:
ON-OFF control circuit, it is in order to make the discharge of carrying out described second capacitor and described the 4th capacitor in order, apply a side's of described first battery the voltage of terminal to described first capacitor, apply the opposing party's of described first battery the voltage of terminal to described the 3rd capacitor, and apply the opposing party's the voltage of terminal of described first battery to described first capacitor and described the 3rd capacitor after, carry out the discharge of described second capacitor and described the 4th capacitor more in order, apply a side's of described second battery the voltage of terminal to described first capacitor, apply the opposing party's of described second battery the voltage of terminal to described the 3rd capacitor, and the voltage of terminal that applies the opposing party of described second battery to described first capacitor and described the 3rd capacitor, and control described discharge circuit and described on-off circuit.
15. voltage detecting circuit according to claim 14 is characterized in that,
Described ON-OFF control circuit, in order to make behind the voltage of the opposing party's who applies described second battery to described first capacitor and described the 3rd capacitor terminal, carry out the voltage of terminal that applies a side of described second battery to described first capacitor and described the 3rd capacitor in order, and control described on-off circuit.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006330783A JP4820739B2 (en) | 2006-12-07 | 2006-12-07 | Battery voltage detection circuit |
| JP2006330783 | 2006-12-07 | ||
| JP2006-330783 | 2006-12-07 | ||
| JP2007070834 | 2007-03-19 | ||
| JP2007-070834 | 2007-03-19 | ||
| JP2007070834A JP4887189B2 (en) | 2007-03-19 | 2007-03-19 | Battery voltage detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101196540A true CN101196540A (en) | 2008-06-11 |
| CN101196540B CN101196540B (en) | 2010-09-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710198809XA Expired - Fee Related CN101196540B (en) | 2006-12-07 | 2007-12-07 | Voltage detecting circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4820739B2 (en) |
| CN (1) | CN101196540B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP4820739B2 (en) | 2011-11-24 |
| CN101196540B (en) | 2010-09-08 |
| JP2008145180A (en) | 2008-06-26 |
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