Pulse-controlled D-C converter with capacitive load
AssigneeSiemens Aktiengesellschaft
InventorHarald Heinicke
Life of this patent
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Abstract
A voltage converter circuit for providing electrical energy to a capacitive load, the converter circuit having a pulse transformer having primary and secondary circuits. Pulse signals are provided in the primary circuit by thyristor devices. The thyristors are quenched by circuitry contained in the secondary circuit, comprising a storage capacitor which conducts a quenching current through a bank of power transistors to at least a portion of a secondary winding. A magnetizing current from a further secondary winding in the secondary circuit is utilized to charge the capacitor.
Claims4
A D-C voltage converter circuit for controlling a voltage at output terminals for connecting a capacitive load, the circuit being of the type having a pulse transformer having primary and secondary circuits, the primary circuit having at least one thyristor for producing electrical pulses in the primary circuit, the secondary circuit including said output terminals having a quenching arrangement for extinguishing conduction of the thyristor in the primary circuit and the second circuit further having a first current path for the demagnetizing current, the converter circuit having a second current path containing a bypass diode being associated with the load, the converter circuit being CHARACTERIZED IN THAT the secondary circuit is further provided with:
- at least a first capacitor for providing a pulse current to a predetermined portion of a first secondary winding of the pulse transformer;
- first diode means connected to said first secondary winding for charging said capacitor;
- discharge means comprising a transistor bank and a second diode means for conducting said pulse current to said predetermined portion of said first secondary winding;
- and
- a second secondary winding for producing said demagnetizing current, said demagnetizing current being conducted through a third diode means to said first capacitor.
Dependencies are inferred from the claim text.