CN207301174U - A kind of section amplifying circuit applied in internal resistance of cell measurement - Google Patents
A kind of section amplifying circuit applied in internal resistance of cell measurement Download PDFInfo
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- CN207301174U CN207301174U CN201721234752.XU CN201721234752U CN207301174U CN 207301174 U CN207301174 U CN 207301174U CN 201721234752 U CN201721234752 U CN 201721234752U CN 207301174 U CN207301174 U CN 207301174U
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Abstract
It the utility model is related to a kind of section amplifying circuit applied in internal resistance of cell measurement, the circuit includes sequentially connected voltage sampling unit, bucking circuit, amplifying circuit, further includes the counteracting voltage generating unit being connected with bucking circuit and the adjustment unit being connected respectively with voltage sampling unit, counteracting voltage generating unit, amplifying circuit；Voltage difference after the magnitude of voltage that the circuit exports battery is offset after being made the difference with counteracting magnitude of voltage, and adjust amplification coefficient with reference to voltage difference after counteracting, voltage difference after the counteracting is amplified according to the amplification coefficient, battery voltage value after being offset, battery voltage value is smaller after being offset due to the pedestal voltage value as amplification, can improve amplification coefficient, and amplification coefficient improves, measurement accuracy can be improved, while increases the measurement range of useful signal.
Description
Technical field
It the utility model is related to a kind of section amplifying circuit applied in internal resistance of cell measurement.
Background technology
Cell voltage is the extremely important parameter of battery, and voltage is high and low to be shown to have overcharged or overdischarge, two kinds
Situation has infringement to battery life；The storage battery of greater number be used in series easily there are the unbalanced phenomenon of voltage, voltage
It is long-term it is unbalanced be just also easy to produce behindhand battery, if behindhand battery charging is incomplete, depth of discharge can be into electric discharge afterwards
As soon as step aggravates, more fall behind after charging.In this way, discharge and recharge number is more, and it is unbalanced more prominent, cause behindhand battery to lose
Effect.So should monthly measure the magnitude of voltage of each cell batteries, the storage battery less than certain standard voltage to be carried out "
Fill ", it is returned to full charge of state, to avoid the failure of indivedual behindhand batteries.Therefore the voltage of accurate measurement battery
It is of great significance.
On the other hand, battery also has internal resistance parameter except voltage parameter, and internal resistance is needed by battery discharge operational measure,
The difference of cell voltage divided by discharge current are weighed when relying primarily on cell voltage when not discharging and electric discharge, due to battery
The general very little of internal resistance, micro-ohm can't be too big with pressure difference during electric discharge to milliohm rank, therefore when not discharging, in order to which internal resistance is surveyed
Examination is accurate, and inevitable requirement is accurate by voltage measurement, and in terms of this dimension, degree of precision voltage measurement is of great significance.
Certain another aspect,, can if being measured simply by the device using higher precision in order to improve precision
The cost of product is greatly increased, therefore designs and a kind of is had very much using what commonplace components can improve that the method for measurement accuracy shows
It is necessary.
Existing market product directly measures voltage signal to be measured, current signal amplification, since there are larger base
Plinth voltage, therefore the amplification coefficient of amplifying circuit can not possibly be done greatly, the measurement electric current for limited resolution, precision is naturally also not
Enough height, measurement range are also limited.
The content of the invention
To overcome drawbacks described above, the purpose of this utility model is to provide a kind of increasing measurement range and improves measurement essence
The section amplifying circuit applied in internal resistance of cell measurement of degree.
The purpose of this utility model is achieved through the following technical solutions：
A kind of section amplifying circuit applied in internal resistance of cell measurement, including it is sequentially connected：It is defeated for gathering battery
The voltage sampling unit of the magnitude of voltage gone out, electricity after the magnitude of voltage for battery to be exported is offset after being made the difference with counteracting magnitude of voltage
The bucking circuit of pressure difference, for voltage difference after counteracting is amplified according to amplification coefficient offset after battery voltage value
Amplifying circuit；Further include with bucking circuit be connected to produce offset magnitude of voltage counteracting voltage generating unit and respectively with electricity
Pressure sampling unit, offset magnitude of voltage that voltage generating unit, amplifying circuit be connected to export according to the battery adjust to
The adjustment unit for the amplification coefficient offset magnitude of voltage and adjust amplifying circuit that the voltage generating unit that disappears produces.
Further, further include with amplifying circuit be connected to by battery voltage value after the counteracting for analog signal be converted to
The A/D conversion circuits of battery voltage values after disappearing.
Further, it is provided with the counteracting voltage generating unit for the counteracting voltage number after adjustment unit is adjusted
Value is converted to the D/A conversion circuits for offsetting magnitude of voltage.
A kind of section amplifying circuit applied in internal resistance of cell measurement provided by the utility model, the electricity that battery is exported
Voltage difference after pressure value is offset after being made the difference with counteracting magnitude of voltage, and adjust amplification coefficient, root with reference to voltage difference after counteracting
Voltage difference after the counteracting is amplified according to the amplification coefficient, battery voltage value after being offset, due to as amplification
Pedestal voltage value i.e. offset after battery voltage value it is smaller, amplification coefficient can be improved, amplification coefficient improve, survey can be improved
Accuracy of measurement, while increase the measurement range of useful signal.
Brief description of the drawings
For ease of explanation, the utility model is described in detail by following preferred embodiments and attached drawing.
Attached drawing 1 returns for the internal resistance of battery in a kind of section amplifying circuit applied in internal resistance of cell measurement of the utility model
Road model；
Attached drawing 2 is conventional amplifying circuit of the prior art；
Attached drawing 3 is a kind of a kind of mould of embodiment of section amplifying circuit applied in internal resistance of cell measurement of the utility model
Block diagram；
Attached drawing 4 is a kind of a kind of electricity of embodiment of section amplifying circuit applied in internal resistance of cell measurement of the utility model
Lu Tu；
Attached drawing 5 is a kind of section amplifying circuit another kind embodiment applied in internal resistance of cell measurement of the utility model
Circuit diagram；
Attached drawing 6 is a kind of flow chart for applying the section amplification method in internal resistance of cell measurement of the utility model.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining
The utility model, is not used to limit the utility model.
As shown in Figure 1, it is most basic, intuitively battery discharge circuit.Measuring the internal resistance of cell generally can be equivalent electric for this
Road.Wherein r represents the internal resistance of battery, and R is exterior measurement sampling resistor, and resistance value is it is known that rmCabling for battery to load R
Impedance.
Measuring method is as follows：
Put switch K and be in open mode, measure V at this time0It is denoted as U0, r at this timemVoltage above is the voltage above 0, R
V1Should also be 0, U0It is also equal to the voltage of battery in itself.
Put switch K and be in closure state, the V0 measured at this time is denoted as u0, r at this timemVoltage above is denoted as urm, above R
Voltage V1 is measured and is denoted as uR, the voltage above internal resistance r is denoted as ur, at this time the size of current in circuit be denoted as i.
According to Ohm's law and KVL laws, it can be deduced that below equation
u0=urm+uREquation 1
U0=ur+urm+uREquation 2
Both the above equation subtracts each other, and can release ur=U0-u0
I=uR/ R, ur=r*i
So draw,
R*i=U0-u0→ r=(U0-u0)/i → r=(U0-u0)*R/uR
Therefrom, it can be found that when equation 2, equation 1 make additive operation, the error of line resistance above is eliminated, so that directly
Improve the precision of measurement.This namely four-wire method measurement resistance advantage where.
From equation, it can be seen that the precision of r depends on the acquisition precision of voltage and the precision of sampling resistor.Not
In the case of considering interference, the precision of voltage depends on dynamic range, the precision of ADC；Sampling resistor should be examined when being then purchase
Consider its precision.
Due to r very littles, (U0-u0) also very little, in order to measure this change, necessarily have to voltage sampling circuit higher
Requirement.
Universal amplifier, amplification section are from 0V to ceiling voltage sampled point.It is more solid for cell voltage excursion
Characteristic that is fixed, and changing not since origin, designs targetedly biasing circuit, realizes 2V battery samplings amplification range from 1.5V
To 2.5V, 12V batteries are sampled from 10V to 15V.After amplification strategy being biased using section, for the amplifier and ADC of equal accuracy,
It can realize that precision improves 3 times.Battery sampling stepping is reduced into original 1/3, it is achieved thereby that the high accuracy of cell voltage is adopted
Sample.
Because from 70-80 amperes to 5 amperes, it is necessary to solve precision problem.Because electric current is small, can change, still
Vary less, it is necessary to which this measure of the change is come out, it is desirable to which precision is very high.If electric current is very big, then changing also can be very big,
It is easy for measuring.Current trend is to use small current measurement, it is therefore desirable to which that is done in precision is good.
As shown in Fig. 2, conventional circuit Vout=k1*Vin, therefore k cannot be very big, it is assumed that Vin is by constant part
Vconst and variable part Vchg compositions, i.e. Vin=Vconst+Vchg, therefore Vout=k1* (Vconst+Vchg)=k1*
Vconst+k1*Vchg, since the presence of k1*Vconst occupies the range section of the measuring circuits such as Adc, amplification coefficient
K1 cannot accomplish very big；On the other hand, amplifying circuit output is generally no more than amplification supply voltage, therefore also results in amplification system
Number k1 cannot accomplish very big.
As shown in Figure 3-4, the section amplifying circuit of the application, is balanced out Vconst using Vcom before amplifying, phase
Effectively inputted as Vchg, Vout=k2* (Vconst+Vchg-Vcom)=k2*Vconst+k2*Vchg-k2* when in amplifying circuit
Vcom=k2*Vchg, at this time k2 do larger, main cause is Vchg typically small.
Specially：A kind of section amplifying circuit applied in internal resistance of cell measurement, including sequentially connected voltage sample
Unit, bucking circuit, amplifying circuit, A/D conversion circuits, further include the counteracting voltage generating unit being connected with bucking circuit and divide
The adjustment unit not being connected with voltage sampling unit, counteracting voltage generating unit, amplifying circuit；
The voltage sampling unit is used for the magnitude of voltage for gathering battery output；
The counteracting voltage generating unit, which is used to produce, offsets magnitude of voltage；
The bucking circuit is used for after the magnitude of voltage of battery output is made the difference with counteracting magnitude of voltage voltage difference after being offset；
The amplifying circuit is used to be amplified voltage difference after counteracting according to amplification coefficient, cell voltage after being offset
Value；
The magnitude of voltage that the adjustment unit is used to be exported according to the battery offsets the counteracting of voltage generating unit generation to adjust
Magnitude of voltage and the amplification coefficient for adjusting amplifying circuit.
Wherein, the A/D conversion circuits being connected with amplifying circuit are further included, it will be analog signal which, which is used for,
Counteracting after battery voltage value be converted to counteracting after battery voltage values.D/A conversions are provided with the counteracting voltage generating unit
Circuit (not shown), the D/A conversion circuits are used for the counteracting voltage value after adjustment unit is adjusted and are converted to counteracting magnitude of voltage.
Compared to the circuit in Fig. 4, referring to Fig. 5, offsetting the voltage of voltage generating unit can also according to circumstances be adjusted,
Measurement range can be increased.Output unit of the DAC adjustable voltage circuits as variable voltage can be used.
Referring to Fig. 6, a kind of section amplification method applied in internal resistance of cell measurement of the utility model, including following step
Suddenly：
Determine the magnitude of voltage of battery output；
Counteracting magnitude of voltage is adjusted according to the magnitude of voltage of battery output；
Voltage difference after being offset after the magnitude of voltage of battery output is made the difference with counteracting magnitude of voltage；
With reference to voltage difference adjustment amplification coefficient after counteracting, voltage difference after the counteracting is put according to the amplification coefficient
Greatly, battery voltage value after being offset.
Wherein, battery voltage value is analog signal after the magnitude of voltage of battery output, counteracting, cell voltage after the counteracting
Battery voltage values after value is offset by A/D conversions, the counteracting magnitude of voltage are the simulation letter obtained after being changed by D/A
Number.
A kind of section amplification method and circuit applied in internal resistance of cell measurement provided by the utility model, both are by electricity
Voltage difference after the magnitude of voltage of pond output is offset after being made the difference with counteracting magnitude of voltage, and put with reference to voltage difference adjustment after counteracting
Big coefficient, is amplified voltage difference after the counteracting according to the amplification coefficient, battery voltage value after being offset, due to conduct
Battery voltage value is smaller after the pedestal voltage value of amplification is offset, and can improve amplification coefficient, and amplification coefficient improves, Ke Yiti
High measurement accuracy, while increase the measurement range of useful signal；The utility model protection be above-mentioned each circuit components and
Its connection relation, is not related to the innovation to software.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (3)
1. a kind of section amplifying circuit applied in internal resistance of cell measurement, it is characterised in that including sequentially connected：For adopting
The voltage sampling unit of the magnitude of voltage of set battery output, for the magnitude of voltage that battery exports to be obtained with offsetting after magnitude of voltage makes the difference
The bucking circuit of voltage difference after counteracting, for voltage difference after counteracting is amplified according to amplification coefficient offset after electricity
The amplifying circuit of cell voltage value；Further include with bucking circuit be connected to produce offset magnitude of voltage counteracting voltage generating unit and
The magnitude of voltage exported according to the battery is connected to voltage sampling unit, counteracting voltage generating unit, amplifying circuit respectively
To adjust the adjustment unit for offsetting the amplification coefficient offset magnitude of voltage and adjust amplifying circuit that voltage generating unit produces.
2. section amplifying circuit according to claim 1, it is characterised in that further include with amplifying circuit be connected to by for
Battery voltage value is converted to the A/D conversion circuits of battery voltage values after counteracting after the counteracting of analog signal.
3. section amplifying circuit according to claim 1 or 2, it is characterised in that set in the counteracting voltage generating unit
It is equipped with the D/A conversion circuits for being converted to for the counteracting voltage value after adjustment unit is adjusted and offsetting magnitude of voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721234752.XU CN207301174U (en) | 2017-09-25 | 2017-09-25 | A kind of section amplifying circuit applied in internal resistance of cell measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721234752.XU CN207301174U (en) | 2017-09-25 | 2017-09-25 | A kind of section amplifying circuit applied in internal resistance of cell measurement |
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| CN207301174U true CN207301174U (en) | 2018-05-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110696671A (en) * | 2019-09-06 | 2020-01-17 | 恒大智慧充电科技有限公司 | Signal detection method, computer equipment and computer readable storage medium |
| CN113970664A (en) * | 2020-07-24 | 2022-01-25 | 圣邦微电子（北京）股份有限公司 | High-precision current sampling circuit, constant current control circuit and sampling method |
-
2017
- 2017-09-25 CN CN201721234752.XU patent/CN207301174U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110696671A (en) * | 2019-09-06 | 2020-01-17 | 恒大智慧充电科技有限公司 | Signal detection method, computer equipment and computer readable storage medium |
| CN113970664A (en) * | 2020-07-24 | 2022-01-25 | 圣邦微电子（北京）股份有限公司 | High-precision current sampling circuit, constant current control circuit and sampling method |
| CN113970664B (en) * | 2020-07-24 | 2024-04-12 | 圣邦微电子（北京）股份有限公司 | High-precision current sampling circuit, constant-current control circuit and sampling method |
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