Electric power conversion systems – Current conversion – Having plural converters for single conversion
Reexamination Certificate
2000-09-05
2001-11-06
Berhane, Adolf Deneke (Department: 2838)
Electric power conversion systems
Current conversion
Having plural converters for single conversion
Reexamination Certificate
active
06314009
ABSTRACT:
PRIOR ART
In order to increase the power of DC/DC Converters, they are operated in master/slave mode. In master/slave mode, the so-called master executes overriding control of the tasks in regulating the overall system. The subordinate converter(s) (slaves) function in controlled operation, which results in a multiplication of the electrical output potential. The control of the slave converter can be achieved, for example, through the transmission of switching commands for electrical valves (e.g. control signals of the switching transistors).
THE PROBLEM
DC/DC converters are used to produce one or more voltage potentials or for energy transmission between two different voltage potentials (e.g. 14V/42V dual-voltage vehicle electric systems). The output side parallel connection of n individual converter modules is suitable for flexible reaction to the desired maximal output power.
FIG. 1
shows an apparatus of this kind.
For example, the input voltage side is connected to the generator of the vehicle. If each converter has a separate voltage regulator, then coupling oscillations can occur as a result of the output side connection.
OBJECT OF THE INVENTION
The object of the invention is comprised of increasing the power of direct current converters (DC/DC converters) by means of controlled parallel operation of a number of individual converters while simultaneously preventing coupling oscillations. This object is attained by means of the apparatuses and methods for controlled parallel operation of direct current converters disclosed in the main claim and the dependent claims.
ADVANTAGES OF THE INVENTION
The principle of load sharing demonstrated and claimed in claim
1
advantageously prevents the danger of coupling oscillations in voltage regulators operating in parallel. The disposition of the converters can be embodied both close together or spaced apart. In contrast to the known method, a data exchange only has to take place between the converters when they are switched. A low bandwidth connection (e.g. CAN) is sufficient for this purpose. The serial control structure has the advantage that it permits an identical design of the converters.
Other advantages of the invention are achieved by means of the measures taken in the dependent claims.
REFERENCES:
patent: 4924170 (1990-05-01), Henze
patent: 5768117 (1998-06-01), Takahashi et al.
patent: 6014322 (2000-01-01), Higashi et al.
patent: 6166934 (2000-12-01), Kajouke et al.
Wu T F et al “Reliability Improvement in Parallel Connected Converter System”, Proceedings of the International Conference on Industrial Electroni Control and Instrumentation, Kobe, Oct. 28-Nov. 1, 1991, vol. 1, No. Conf. 17, Oct. 28, 1991, pp. 429-434.
Dittmer Bernd
Gronbach Roman
Rieger Reinhard
Schoettle Richard
Berhane Adolf Deneke
Robert & Bosch GmbH
Striker Michael J.
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