GB2296777A - Battery charge condition monitor - Google Patents

Battery charge condition monitor Download PDF

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Publication number
GB2296777A
GB2296777A GB9423436A GB9423436A GB2296777A GB 2296777 A GB2296777 A GB 2296777A GB 9423436 A GB9423436 A GB 9423436A GB 9423436 A GB9423436 A GB 9423436A GB 2296777 A GB2296777 A GB 2296777A
Authority
GB
United Kingdom
Prior art keywords
battery
voltage
charged
measurement
charge condition
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.)
Withdrawn
Application number
GB9423436A
Other versions
GB9423436D0 (en
Inventor
Raymond Ian Hart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9423436A priority Critical patent/GB2296777A/en
Publication of GB9423436D0 publication Critical patent/GB9423436D0/en
Publication of GB2296777A publication Critical patent/GB2296777A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • 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]
    • G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
    • G01R31/379—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator for lead-acid batteries

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tests Of Electric Status Of Batteries (AREA)

Abstract

A battery charge condition monitor displays the charge state of a rechargeable battery, using indicator lights. The battery terminal voltage is compared with predetermined voltages on a potential divider and indicator lights are used to display the charge condition. A Hall sensor determines the direction of current through the battery leads and controls a MOSFET transistor to switch the divider resistance values in accordance therewith. <IMAGE>

Description

VERY SIMPLE . HIGHLY ACCURATE - BATTERY CHARGE CONDITION MONITOR FOR SMALL YATCHS DESCRIPTION MONITORS BATTERY VOLTAGE AT THE BATTERY TERMINALS USING A SPECIAL LEAD PAIR, WHICH CARRY HIGH CURRENT WITH BUILT IN VOLTAGE MONITORING CAPABILITY.
THE INVENTION RELIES ON THE FACT THAT THE BATTERY TERMINAL VOLTAGE CAN BE SHOWN GRAPHICALLY AS A MULTIPLE OF THE CELL VOLTAGE: Needs to be prototyped to check functionality.

Claims (5)

1. Displays the charge condition of a rechargeable battery eg. a lead acid battery, using a measurement of the battery terminal voltage and measurement of the direction of current flow through the battery. (see page I of application).
2. Measurement of voltage is carried out by use of a series of comparators, comparing the battery voltage with predetermined voltages on a potential divider, which are used to operate indicator lights displaying battery charge condition. The graph (page 2 of application) shows how battery voltage varies according to the charge state and whether the battery is being charged or discharged.
3. Measurement of current direction is carried out by using a Hall effect sensor on the battery lead.
4. The output of the Hall effect sensor is used to switch potential divider resistor values, such that one set of values is used when the battery is being charged and another set when the battery is being discharged. In this way different thresholds are set for the 2 conditions. (see page 3 of application).
5. The resistor potential dividers are used to set the voltage thresholds for the 2 conditions during an initial calibration. In this way the indicator light for say 60% charge should be illuminated if the battery is 60% charged, regardless of whether the battery is being charged or discharged, although the battery terminal voltage is different for the 2 conditions.
GB9423436A 1994-11-19 1994-11-19 Battery charge condition monitor Withdrawn GB2296777A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9423436A GB2296777A (en) 1994-11-19 1994-11-19 Battery charge condition monitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9423436A GB2296777A (en) 1994-11-19 1994-11-19 Battery charge condition monitor

Publications (2)

Publication Number Publication Date
GB9423436D0 GB9423436D0 (en) 1995-01-11
GB2296777A true GB2296777A (en) 1996-07-10

Family

ID=10764718

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9423436A Withdrawn GB2296777A (en) 1994-11-19 1994-11-19 Battery charge condition monitor

Country Status (1)

Country Link
GB (1) GB2296777A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT413772B (en) * 2001-09-07 2006-05-15 Koeberl Heimo Connection method, for auxiliary battery as backup for motor vehicle starter battery, interconnects auxiliary and starter batteries via a controllable switch in order to maintain operation if starter battery fails

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020414A (en) * 1975-01-31 1977-04-26 Konar Corporation Plural comparator indicator of battery voltage
GB1562717A (en) * 1975-12-12 1980-03-12 Citroen Sa Electronic charge indicator for a battery
EP0600234A2 (en) * 1992-12-02 1994-06-08 Matsushita Electric Industrial Co., Ltd. System for displaying residual capacity of a battery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020414A (en) * 1975-01-31 1977-04-26 Konar Corporation Plural comparator indicator of battery voltage
GB1562717A (en) * 1975-12-12 1980-03-12 Citroen Sa Electronic charge indicator for a battery
EP0600234A2 (en) * 1992-12-02 1994-06-08 Matsushita Electric Industrial Co., Ltd. System for displaying residual capacity of a battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT413772B (en) * 2001-09-07 2006-05-15 Koeberl Heimo Connection method, for auxiliary battery as backup for motor vehicle starter battery, interconnects auxiliary and starter batteries via a controllable switch in order to maintain operation if starter battery fails

Also Published As

Publication number Publication date
GB9423436D0 (en) 1995-01-11

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)