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| Plural comparator indicator of battery voltage |
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| Charge status indicator |
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Control device for the charging of at least one battery
| Details |
Inventors: Le Van Suu, Maurice;
Assignee: SGS-Thomson Microelectronics S.A. (Saint Genis, FR)
Primary Examiner: Wong; Peter S.
Assistant Examiner: Law; Patrick B.
Attorney, Agent or Firm: Wolf, Greenfield & Sacks, P.C., Morris; James H.
A battery-charger uses a fuzzy logic microprocessor. The use of fuzzy logic makes it easier to take account of the diversity of the types of batteries to be charged and to control the state of the batteries charged while, at the same time, producing a battery at very low cost, whereas these functions are normally carried out by far bigger microprocessors. The invention can be applied especially to the charging of batteries assembled to constitute powerful energy sources, that are used especially for automobile haulage, large-scale consumer articles, professional and industrial equipment or computer equipment. |
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DETAILED DESCRIPTION The present invention seeks to overcome these drawbacks by using a control device that operates based on different principles.
The control device of the invention relies on the use of fuzzy logic.
To this end, one embodiment of the invention obtains a measurement, using voltage divider bridges (although currents could be measured), of different conditions for the charging of the battery.
In one embodiment, four different conditions are measured.
For all the conditions measured, sets of membership functions are established: each function determines a range of variation of the measurement variable.
For this range, it is considered that this variable has a particular qualification.
The variable having a qualification is furthermore quantified in the membership function by a membership coefficient.
The variable has a concerned qualification with a coefficient ranging from zero to one: the coefficient is zero when the qualification is not met and one when the qualification is met completely.
A set of rules is set up establishing correspondences between these qualifications and signals to be applied to the control circuits.
This embodiment of the invention then entails dealing with the charging conditions (the extent of the charging will vary according to whether the battery to be charged is at a smaller or greater distance from its maximum value) in the same way as with the management of the charging operation (for example, a decision to stop the charging of a battery that does not withstand the charging).
Preferably, the device of the invention will therefore carry out the technical control and the administrative control of the charging, both at the same time.
An object of the invention therefore is to control the charging of at least one battery using a control device, this control device comprising a microprocessor, a memory, a set of voltage divider bridges to measure the conditions of the charging of the battery and circuits to control the charging of the battery connected to this device
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