GB2076166A - Method of Measuring and Indicating the State of Charge of an Accumulator - Google Patents
Method of Measuring and Indicating the State of Charge of an Accumulator Download PDFInfo
- Publication number
- GB2076166A GB2076166A GB8114880A GB8114880A GB2076166A GB 2076166 A GB2076166 A GB 2076166A GB 8114880 A GB8114880 A GB 8114880A GB 8114880 A GB8114880 A GB 8114880A GB 2076166 A GB2076166 A GB 2076166A
- Authority
- GB
- United Kingdom
- Prior art keywords
- accumulator
- voltage
- current
- measuring
- charge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
A method of measuring and indicating the state of charge of an accumulator 3 wherein the accumulator terminal voltage is summed with a measuring voltage which is derived from a shunt 4 located in the charging or discharging current circuit of the accumulator the direction of the current circuit of the accumulator being ascertained according to whether the accumulator is charging or discharging and the total voltage being arrived at by adding or subtracting the voltage measured at the shunt to or from the accumulator terminal voltage, the total voltage is then compared with a reference potential and the potential thereby obtained is applied to an indicator device. <IMAGE>
Description
SPECIFICATION
Method of Measuring and Indicating the State of Charge of an Accumulator
This invention relates to a method of measuring and indicating the state of charge of an accumulator.
In particular the method is concerned with the continuous measurement and indication of the state of charge of an accumulator by summation of the accumulator terminal voltage (voltage determination) and a measuring voltage which is derived from a shunt situated in the discharge current circuit and chosen arbitrarily (current determination). The measured values are amplified, if necessary, and the total voltage is compared with a reference potential. The differential potential thereby obtained is amplified, if necessary, and is applied to an indicator device controlled by the differential potential.
The method described above has the advantage of being able to indicate the state of charge of the accumulator while being discharged, continuously and very accurately.
Charging of the accumulator is taken into account but the state of charge is correctly indicated only during the discharge phase. This may be a drawback to the method especially if the charging phase is protracted.
An object of the invention is to improve on the method outlined to enable the state of charge of the accumulator to be indicated during both the charging and discharging phases.
According to the invention the method additionally includes ascertaining the direction of the current in the current circuit according to whether the accumulator is charging or discharging, whereby the current and voltage determinations are varied, the total voltage being arrived at by adding or subtracting the voltage measured at the shunt to or from the accumulator terminal voltage.
The voltage measured at the shunt and/or the accumulator terminal voltage may be amplified, if necessary.
Preferably the current direction is ascertained by determining the polarity of the voltage measured at the shunt and the terminal voltage of the accumulator may be measured, the terminal voltage varying positively or negatively with time.
The signals of positive or negative potential arising from ascertaining the current direction may be amplified, if necessary, and used for changing the current determination and the accumulator voltage determination.
Conveniently the current determination may be effected in accordance with ascertaining the current direction by varying the amplification factor in an operational amplifier to which the voltage measured at the shunt is applied.
In determining the accumulator voltage this may be effected in accordance with ascertaining the current direction by varying the accumulator voltage by an amount A so that the variation of the amount is determined in accordance with the voltage-time characteristics of the accumulator.
This can be achieved in such a way that a value which is measured and is proportional to the accumulator terminal voltage is removed at a potential divider by a variable resistance. The variable resistance is varied according to the voltage-time behaviour of the polarisation of the accumulator.
There is now described an embodiment of the invention with reference to the drawing which is a circuit diagram employing the method of the invention.
Referring to the drawing a charging or discharging current in a load circuit 1 produces a potential drop at a shunt 4, the circuit 1 containing a load 2 and an accumulator 3.
The voltage at the shunt 4 is applied to an operational amplifier OV-1 and its polarity is ascertained by means of a comparator 7. The voltage signal received is amplified, if necessary, and is used to operate a relay 8.
On actuation of the relay 8 the amplification factor at which the operational amplifier OV-1 is set is changed to another amplification factor provided for a charging process. Simultaneously an alteration is made in the measured value which is applied to an operational amplifier OV-2 via a potential divider R8/R9 and is proportional to the accumulator voltage, that is a variable resistance
R9 is altered by an amount AR which arises in a correcting element 9 corresponding to the voltage-time behaviour of the accumulator polarisation (i.e. its charge characteristic).
The total voltage received from the operational amplifiers OV-1 and OV-2 is compared directly with a negative reference potential in the operational amplifier OV-4. In addition, depending on the determination of the current direction or the actuation of the relay 8, the voltage tapped off at the shunt 4 is added to or subtracted from the accumulator terminal voltage so that both during a discharge phase and during a charging phase the differential voltage which results always indicates the true state of charge of the accumulator. The differential voltage thus obtained is then amplified in an operational amplifier OV-3 and passed to a luminous spot control element 6, or to another voltage meter, which converts the voltage presented to an exact value of the state of charge of the accumulator.
The total potential obtained from amplifiers
OV-1 and OV-2 can, in addition, be corrected for temperature and ageing through the voltages of operational amplifiers OV-7 aand OV-8.
Prior German patent application No. P 28 56 948.4 describes a method for the continuous measurement and indication of the state of charge of an accumulator and this method is similar to that described herein in being able to measure the state of charge of the accumulator while being discharged. The present invention differs primarily in also being able to measure the state of charge during charging of the accumulator.
Claims (8)
1. A method of measuring and indicating the state of charge of an accumulator wherein the accumulator terminal voltage (voltage determination) is summed with a measuring voltage which is derived from a shunt located in the charging or discharging current circuit of the accumulator and chosen arbitrarily (current determination), the total voltage is compared with a reference potential and the differential potential thereby obtained is applied to n indicator device controlled by the differential potential, the direction of the current in the current circuit of the accumulator being ascertained according to whether the accumulator is charging or discharging and the total voltage being arrived at by adding or subtracting the voltage measured at the shunt to or from the accumulator terminal voltage.
2. A method according to claim 1 wherein the accumulator terminal voltage varies positively or negatively with time and is measured for ascertaining the direction of the current.
3. A method according to claim 1 wherein the polarity of the measuring voltage at the shunt is determined for ascertaining the direction of the current.
4. A method according to any one of claims 1-3 wherein the accumulator voltage determination is effected according to the direction of current ascertained by altering the accumulator voltage value by a specific amount so that the variation of the amount is determined in accordance with the voltage-time characteristics of the polarisation of the accumulator.
5. A method according to claim 4 wherein a measuring value proportional to the accumulator terminal voltage is removed at a potential divider by a variable resistance which is varied according to the voltage-time characteristics of the polarisation of the accumulator.
6. A method according to any one of the preceding claims wherein the current determination, in accordance with ascertaining the current direction, is effected by altering the amplification factor of an operational amplifier to which the measuring voltage derived from the shunt is applied.
7. A method of measuring and indicating the state of charge of an accumulator substantially as described with reference to the accompanying circuit diagram.
8. Means for measuring and indicating the state of charge of an accumulator substantially as described with reference to the drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803018981 DE3018981A1 (en) | 1980-05-17 | 1980-05-17 | METHOD FOR CONTINUOUSLY MEASURING AND INDICATING THE CHARGE STATE OF A BATTERY |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2076166A true GB2076166A (en) | 1981-11-25 |
| GB2076166B GB2076166B (en) | 1984-06-27 |
Family
ID=6102723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8114880A Expired GB2076166B (en) | 1980-05-17 | 1981-05-15 | Method of measuring and indicating the state of charge of an accumulator |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3018981A1 (en) |
| FR (1) | FR2482731A1 (en) |
| GB (1) | GB2076166B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3218148C2 (en) * | 1982-05-14 | 1984-05-03 | Deta-Akkumulatorenwerk Gmbh, 3422 Bad Lauterberg | Method and device for displaying the discharge status and for controlling the charging of a drive accumulator |
| FR2576110B1 (en) * | 1985-01-11 | 1988-07-08 | Aerospatiale | SYSTEM FOR THE VISUALIZATION OF THE AUTONOMY OF OPERATION LIKELY TO BE ENSURED WITH ELECTRICAL INSTALLATION BY AUXILIARY BATTERIES AND ELECTRICAL INSTALLATION PROVIDED WITH SUCH A SYSTEM |
| DE3736481C2 (en) * | 1987-10-28 | 1996-10-02 | Graesslin Kg | Method and device for determining the energy content of electrochemical energy stores |
| DE3836569A1 (en) * | 1988-10-27 | 1990-05-03 | Martin Spies | METHOD FOR TESTING THE OPERATING CONDITION OF AN ELECTRIC ENERGY STORAGE OF MOTOR VEHICLES, AND DEVICE FOR IMPLEMENTING THE METHOD |
| DE102010020993A1 (en) * | 2010-05-19 | 2011-11-24 | Li-Tec Battery Gmbh | Method for controlling the maximum charging rate of an electrochemical energy storage device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2400901C2 (en) * | 1974-01-09 | 1982-05-27 | Müller & Weigert GmbH, 8500 Nürnberg | Method and device for measuring the discharge status of batteries |
| AT331357B (en) * | 1974-01-11 | 1976-08-25 | Jungfer Akkumulatoren | ELECTRICAL DISPLAY DEVICE FOR THE CHARGE STATE OF A SECONDARY BATTERY |
| FR2361754A1 (en) * | 1976-08-11 | 1978-03-10 | Accumulateurs Fixes | METHOD AND DEVICE FOR MONITORING THE CHARGE AND DISCHARGE OF AN ACCUMULATOR BATTERY |
| JPS5337832A (en) * | 1976-09-20 | 1978-04-07 | Aichi Electric Mfg | Detecting device for residual capacity of storage battery |
| FR2425160A1 (en) * | 1978-05-03 | 1979-11-30 | Accumulateurs Fixes | Accumulator charge and discharge control circuit - measures load and charge times to ensure constant charge rate irrespective of loading |
-
1980
- 1980-05-17 DE DE19803018981 patent/DE3018981A1/en active Granted
-
1981
- 1981-05-15 GB GB8114880A patent/GB2076166B/en not_active Expired
- 1981-05-15 FR FR8109725A patent/FR2482731A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE3018981A1 (en) | 1981-11-26 |
| DE3018981C2 (en) | 1988-10-27 |
| FR2482731B1 (en) | 1985-03-22 |
| GB2076166B (en) | 1984-06-27 |
| FR2482731A1 (en) | 1981-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960515 |