Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1991-05-24
1992-11-24
Stephan, Steven L.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 29, 322 28, 322 99, H02J 714, H02J 716
Patent
active
051665948
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a battery charging system and, more particularly, to a battery charging system for a motor vehicle battery, which is part of a motor vehicle and which indicates opertional faults.
A battery charging system of the above described type is known comprising a generator having generator terminals, a rectifier system connected with the generator and having main diodies and exciter diodes as well as two terminals (B+, D-) for connection of at least one battery to be charged, at least one terminal (D+) for consuming points, a voltage regulator (14) connected to the generator for controlling a generator output voltage of the generator, a charging control light and means connected to the generator for recognition and indication of faults by the charging control light and for protection from excess voltages.
Battery charging systems are known in which several possible faults can be indicated and which can when a fault occurs be switched to an emergency function, for instance an emergency control. A battery charging system is thus for instance known from DE-OS 30 06 109 wherein the electrical battery to be charged is supplied by an alternating current generator containing an exciter coil and a rectifier, a semi-conductor voltage regulator is provided to keep the generator voltage constant. When the generator voltage exceeds or falls below a given value, this is indicated by a charging control device.
The indication of faults gives the user timely warning. Consequential damage therefore, for instance boiling dry of the battery or failure of the entire electrical installation of the motor vehicle, is thereby avoided. In the device described in DE OS 30 06 109 an emergency control comes into operation when the connection between the generator and the battery is interrupted, preventing too sharp an increase of the generator output voltage.
This battery charging system has however the disadvantage that although the fault "defective connection in regulator" is indicated, no emergency control can take place in this case.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved battery charging system with fault indicator, which avoids the disadvantages described above.
This object, and others which will be made more apparent hereinafter, are attained in a battery charging system with fault indication, particularly for a motor vehicle, comprising a generator with generator terminals, a rectifier system connected to the generator with main diodes and exciter diodes as well as terminals (B+,D-) for connection of at least one battery to be charged, at least one terminal (D+) for connection of consuming points, a voltage regulator for control of the generator output voltage and a charging control light and means for recognition of faults and indication of the faults by charging control light and for protection of the battery charging system from excess voltages.
According to the invention, the means for recognition of faults and protection includes an additional voltage regulating device, which is independent of the voltage regulator and operates in place of the voltage regulator, when there is a defective connection in the voltage regulator.
A switching means, advantageously a relay, is provided in a fail-safe device and connected to the voltage regulating device which is also in the fail-safe device. The fail-safe device is designed so that, when an excess voltage occurs or a defective connection is present in the voltage regulator, the additional voltage regulating device operates to control the generator output voltage.
The battery charging system in accordance with the invention, has on the contrary the advantage that it indicates a multiplicity of faults in the battery charging system by the charging control device and at the same time permits an emergency control by an auxiliary or additional regulator which is part of a fail-safe device.
The blinking of the charge control light signals the fault to the user of the vehicle. Since however the additional or
REFERENCES:
patent: 3983471 (1976-09-01), Itoh et al.
patent: 4477766 (1984-10-01), Akita et al.
patent: 4670705 (1987-06-01), Sievers et al.
patent: 4755734 (1988-07-01), Komurasaki et al.
Kuhn Edgar
Mittag Rainer
Schramm Gunter
Davidson Ben
Robert & Bosch GmbH
Stephan Steven L.
Striker Michael J.
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