Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1999-07-19
2000-07-11
Berhane, Adolf Deneke
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 71, H02M 700
Patent
active
060882484
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a voltage conversion device, particularly for motor vehicles, and especially a voltage conversion device for a motor vehicle, which includes at least two parallel-connected voltage converters with a common input via which the voltage to be converted is supplied and with a common output at which the converted voltage is picked up.
2. Prior Art
In voltage supply systems, for instance in motor vehicles, the usual on-board electrical voltage is varied, with the aid of direct voltage converters, in such a way that voltages which are optimal to supply the consumers are obtained. One such voltage supply system for an on-board motor vehicle electrical system is known for instance from European Patent Disclosure EP-0 363 356 B1. In this voltage supply system, a plurality of direct voltage converters decoupled on the secondary side are present, whose input is supplied with the battery voltage. On the output side, the voltage converters lead via decoupling diodes to various electronic components, which they supply with a regulated direct voltage. The use of a plurality of direct voltage converters to generate a single output voltage is not contemplated in the known voltage supply system.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved voltage conversion device, especially for a motor vehicle.
This object, and others which will be made more apparent hereinafter, is attained in a voltage conversion device comprising at least two voltage converters connected in parallel with each other, having a common input at which a voltage to be converted is supplied and a common output at which an output converted voltage is delivered.
The voltage conversion device of the invention has the advantage over known devices that a voltage conversion is attained which has little load variations on the supply current. This advantageously assures that the supply current causes only little electromagnetic emission, and in general only slight supply fluctuations occur. Also advantageously, output current fluctuations are reduced compared with conventional systems, so that again only slight electromagnetic emission is produced by the output current, and only slight output current fluctuations occur. Since the individual load on the components used is low, an advantageous embodiment with small available, economical components is possible. A technologically complex parallel circuit, for instance using additional resistors with parallel-connected diodes, can be dispensed with.
These advantages are attained by using, instead of a single voltage converter, a selectable number of parallel-connected partial converters, which are synchronously sequentially triggered with the aid of a synchronizing device.
Further advantages of the invention are attained by the characteristics recited in the dependent claims. It is especially advantageous that depending on the needs and/or expense, partial converters that each have one complete regulator part and power part can be used. It is also possible to design the partial converters such that one partial converter has a complete regulator part and power part, while the other partial converter has only its own power parts and is triggered by a common controller.
In another advantageous feature, only a single regulator component is required, whose high switching frequency is distributed to various parallel power parts via a multiplexer that then drives the individual power parts. This makes maximum correction possible with little regulation expense and complication.
BRIEF DESCRIPTION OF THE DRAWING
Exemplary embodiments of the invention are shown in the drawing and will be described in further detail in the ensuing description. Specifically, FIGS. 1, 2 and 3 are block diagrams three different exemplary embodiments. In FIG. 4, a timing graph is shown for the multiplexing operation of the third exemplary embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1, a first exemplary embo
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Aupperle Bernd
Breunig Volker
Schenk Joachim
Sieger Frank
Berhane Adolf Deneke
Robert & Bosch GmbH
Striker Michael J.
Vu Bao Q.
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