Electricity: single generator systems – Generator control – With armature or primary circuit control
Patent
1997-01-16
2000-04-11
Ramirez, Nestor
Electricity: single generator systems
Generator control
With armature or primary circuit control
322 93, 322 25, 322 28, H02P 900, H02H 706
Patent
active
060491981
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for voltage supply, in particular in a motor vehicle electrical system, and, more particularly, to a voltage supply device in a motor vehicle electrical system comprising a self-excited, separately-excited or permanently-excited generator delivering a load current and two rectifier arrangements connected downstream of the generator, which deliver a first voltage at a first connector and a second voltage at a second connector.
2. Prior Art
In connection with a motor vehicle electrical system, wherein the supply voltage required for the electrical consumers is generated by means of a generator, it is known that more than one supply voltage should be provided by the generator, so that a dependable, component-specific supply voltage is assured. To this end it is proposed in DE-OS 37 41 242 to embody a separately-excited rotary current generator in such a way that, besides the usual rectified voltage of the vehicle electrical system, rotary current voltages are made available in addition, which are directly used for supplying a window heater. In this case the regulation of the generator is performed with the aid of a voltage regulator which acts on the exciter current. The additional voltage for supplying the heating coils is not rectified, so that losses which unavoidably occur in the course of rectification are prevented.
With some vehicle electrical systems, permanently-excited generators are employed in place of a separately-excited generator. Since an exciter current regulation is not possible with such generators, it is customary to construct the bridge rectifiers downstream of the generator as regulated bridge/-half bridge rectifiers which, for example, comprise semiconductor power switches which are regulated by an associated voltage regulator in such a way that the voltage supplied at the output of the bridge rectifier is approximately constant or is not exceeded, so that it can be used as the voltage of the vehicle electrical system and can be used for charging the vehicle battery or batteries. Such a permanently-excited generator, including the associated regulated bridge rectifier, is known, for example, from DE-OS 38 41 610, however, the generation of a second voltage is not provided in this case.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved voltage supply device, in particular in a motor vehicle electrical system, which has two different connectors at which two different output voltages are delivered from a generator and in which the generator operates in a state in which an optimum power output takes place.
According to the invention the voltage supply device includes excitation coil; a first connector at which a first voltage is delivered by the generator; a second connector at which a second voltage is tapped; rectifier device and the excitation coil for regulation of an excitation current passing through the excitation coil; and or second connector, so that the generator operates in an operational state, in which an optimum power output takes place.
In the case in which a permanently excited generator is used in the voltage supply device the voltage supply device comprises a first connector at which a first voltage is delivered by the generator; a second connector at which a second voltage is tapped; and or second connector, so that the generator operates in an operational state, in which an optimum power output takes place.
In the case of both the self-excited generator and the permanently excited generator the means for regulating the load current comprises a thyristor connected to the first or second connector, which in a preferred embodiment is not included in either rectifier device, and a triggering device for triggering the thyristor, whereby during full load operation the thyristor is triggered by the triggering device so that a limitation of the load current takes place but during partial load operation the load current is controlled either by the exc
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F. Meyer, et al Autoelektrik Autoelektronik Am Ottonmotor, Robert Bosch GmbH, ISBN 3-18-419106, 1987, pp. 24-26.
Medley Peter
Ramirez Nestor
Robert & Bosch GmbH
Striker Michael J.
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