Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1990-10-01
1992-01-21
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 49, H02M 3335
Patent
active
050832549
ABSTRACT:
Modern switching power supplies include an integrated component (IS) which effects the control of the switch (7). The component (IS) is often supplied with the necessary voltage (U.sub.V) in its inactive state via a protective resistor (14) and in its active state from a transformer winding (15). When a switch-off command is present at the component (IS), the switch (7) is not switched on; this has the effect that the component (IS) goes into a polling state during which it alternates between its inactive and its active state, the period being defined by the capacitance of the charge capacitor. In order to bring the component (IS) into its active state as soon as the switch-off command (U.sub.AB) has been taken away, the active state is blocked while the switch-off command is present. Accordingly, the capacitor (13) can immediately give off the supply voltage (U.sub.V) necessary for activation, as soon as the switch-off command (U.sub.AB) is withdrawn.
REFERENCES:
patent: 4246634 (1981-01-01), Purol
patent: 4497017 (1985-01-01), Davis
patent: 4975592 (1990-12-01), Hahn et al.
Beha Jr. William H.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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