Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-03-20
1999-09-07
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 21, H02M 3335
Patent
active
059496592
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the problem of supplying an electronic unit with auxiliary power in the form of direct voltage and information while ensuring galvanic isolation.
BACKGROUND OF THE INVENTION
The problem can evidently be solved by using a switched-mode power supply of the type known as a single-ended and push-pull converter. Such switched-mode power supplies are described in the book by O. Kilgenstein, Use! (1988), pages 9 to 13. The basic circuitry of various switched-mode power supplies is also described in W. Hirschmann and A Hauenstein, recommended for the galvanically isolated transmission of information to electronic units is the use of transformers or optical couplers.
SUMMARY OF THE INVENTION
An object of the present invention is a particularly simple and cost-effective arrangement for the galvanically isolated transmission of auxiliary power (direct voltage) and information to an electronic unit.
The present invention provides an arrangement for the galvanically isolated transmission of auxiliary power (direct voltage) and information to an electronic unit with a switched-mode power supply including a transformer with at least one primary and one secondary winding. The primary winding of the transformer can be connected to a direct voltage by means of a switching arrangement that can be actuated by a control circuit, while the secondary winding is connected to one output terminal by way of a rectifier element and, on the other hand, directly with the other output terminal of the switched-mode power supply. The control circuit in accordance with the present invention is designed such that it actuates the switching arrangement in accordance with information (primary information) to be transmitted to the secondary side of the switched-mode power supply, and such that an evaluation circuit that detects the primary information is connected to a circuit point between the secondary winding and the rectifier element.
The essential advantage of the arrangement of the present invention is that no additional transformer and no additional optical coupler are needed to transmit the primary information to the electronic unit because the primary information derives from primary-side modulation of the auxiliary-power supply to the switched-mode power supply. The arrangement of the present invention can accordingly do without a transformer or optical coupler to transmit the information to the electronic unit.
It is often necessary for information to flow not only in one direction, from the primary side of the switched-mode power supply to the electronic unit, but also in the opposite direction, from the electronic unit to the primary side. This demand is satisfied to advantage by an embodiment of the arrangement in accordance with the present invention, whereby a transmitter is provided on the secondary side of the switched-mode power supply and switches the load on the secondary winding to low impedance in accordance with information (secondary information) to be transmitted to the primary side of the switched-mode power supply, when the switching arrangement is open, and whereby an evaluation module that detects the secondary information is connected to one end of the primary winding.
Although transmitting information from the secondary side of a switched-mode power supply to the primary side is indeed known from European Patent 0 538 624 A1, the voltage derived from a charging capacitor is forwarded to the secondary winding of the transformer in the switched-mode power supply by an electronic switch actuated for that purpose in the arrangement for transmitting information known from that publication.
It has proven to be advantageous, when the converter in the arrangement of the present invention is single-ended, for the transmitter to include a series comprising first a load impedance and second the switching section of an electronic switch, controlled in accordance with the secondary information to be transmitted, and for the series to constitute, in conjunction wit
REFERENCES:
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patent: 4803722 (1989-02-01), Schreiber
patent: 5438496 (1995-08-01), Meur et al.
patent: 5798913 (1998-08-01), Tiesinger et al.
patent: 5845190 (1998-12-01), Bushue et al.
Buch von W. Hirschmann and A. Hauenstein "Schaltnetzteile", Dec. 1990, pp. 40 through 64.
Buch von O. Kilgenstein "Schaltnetzteile in der Praxis", Dec. 1988, pp. 9 through 13.
Databook "Motorola High Speed CMOS Logic Data" Series D, Dec. 1989.
W. Jitschin, DC-DC-Umsetzer, In: Elektor, Jul./Aug. 1985, pp. 7-62.
Siemens AG
Sterrett Jeffrey
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