Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1993-12-17
1995-08-01
Skudy, R.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 26, H02M 3335
Patent
active
054385008
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to switching regulator with a push-pull converter embodied as a resonance converter, to which a clocked pre-regulator is series-connected, wherein separate primary windings are provided for the push-pull transformer. Such a switching regulator is known from DE 38 12 861.
Resonance converters of this type are known, for example, from "Proceedings of the XVth International PCI Conference", June 1988, Intertec Communications, Ventura, Calif., USA, pages 94 to 122.
It is known from German Patent Publication DE 29 41 009 C2 to series-connect a series switching regulator to a conventional push-pull converter, in particular for the purpose of processing greatly varying input voltages, for example with satellite power supplies. As a rule, the series switching regulator is pulse-width modulated as a function of the output voltage of the switching regulator. The downstream connected push-pull converter is operated either with push-pull pulses of a constant length or with pulse-width modulated pulses.
SUMMARY OF THE INVENTION
It is an object of the invention to embody the switching regulator of the previously mentioned type in such a way that a high degree of efficiency can be achieved. This object is attained by a switching regulator comprising a series resonance push-pull converter (GW) and two clocked boost regulators (AR1, AR2) connected in series with the converter, wherein: the converter comprises a transformer (Tr) having two primary windings (w1, w2) which are galvanically isolated from one another, and two push-pull switches (S1, S2) each connected in series with a respective one of the primary windings; each of the boost regulators comprises a series inductance (L1, L2) and an output capacitor (C1, C2); and the boost regulators are connected to the converter to form two push-pull branches, each of the push-pull branches being composed of the series inductance of one of the boost regulators connected in series with a respective one of the primary windings and a respective one of the push-pull switches, and the output capacitor of each of the boost regulators constituting a resonance capacitor of the converter.
The switching regulator in accordance with the invention has the advantage that it is possible to select the capacity of the corresponding resonance converter to be higher than in conventional resonance or quasi-resonance converters. Sufficient time is available for recharging a resonance capacitor, namely in each case the time during which the respective push-pull switch is open and the blackout time. The transformer of the push-pull converter is better utilized than with other comparable resonance converters, i.e. with the same output it is possible to reduce the structural size. This is of particular advantage for switching regulators used in satellites. The regulation of the two boost regulators is very dependable, because the regulating criteria are derived from separate branches of the push-pull converter. Interference signals (ripples) are greatly suppressed by adding the voltages at the resonance capacitors for regulating the boost regulators.
BRIEF DESCRIPTION OF THE DRAWING
An exemplary embodiment of the invention will be described in greater detail with reference to the drawings.
FIG. 1 a principal circuit diagram of a switching regulator in accordance with the invention,
FIGS. 2A, 2B and 2C are diagrams of selected signals for the switching regulator in accordance with FIG. 1,
FIG. 3 an equivalent circuit diagram on the push-pull converter for one of the push-pull branches,
FIG. 4 is a diagram showing the reversing current of the push-pull converter for different sizes of structural elements.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Two boost regulators AR1, AR2 (boost regulators), supplied in parallel by an input dc-voltage source QE are shown in FIG. 1, downstream of which a parallel push-pull dc-voltage converter GW is connected. The boost regulators AR1 and AR2 each comprise an actuator in the transverse branch, symbolized here
REFERENCES:
patent: 4443840 (1984-04-01), Geissler et al.
patent: 4980813 (1990-12-01), Wells
patent: 5001413 (1991-03-01), Ohms et al.
patent: 5119283 (1992-06-01), Steigerwald et al.
"Proceedings of the XVth International PCI Conference," Intertec Communications, Ventura, Calif., pp. 94-122, Jun. 1988.
ANT Nachrichtentechnik GmbH
Skudy R.
To E.
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