Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1992-07-23
1993-12-21
Stephan, Steven L.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 25, 378110, H02P 1300, H05G 134
Patent
active
052726185
ABSTRACT:
A current supply has a first voltage summing circuit with two inputs, one of which receives a signal that indicates a desired current level to be produced. A current source produces a current level at an output in response to a control signal received from the first voltage summing circuit. The current source output is coupled to a center tap of the primary winding of a transformer that has a capacitor connected across the end terminals of its primary winding. Separate transistors connect ends of the primary winding to a common node and a resistor couples the node to circuit ground. A sensor produces a voltage e.sub.i that is proportional to a magnitude of the current flowing through said capacitor. A second voltage summing circuit produces an output voltage e.sub.t equivalent to the sum of voltage e.sub.i and the voltage across the resistor and the output voltage e.sub.t is applied to the other input of said first voltage summing circuit. Thus any change of the current from the source or of the current flowing through the capacitor alters the current flow in the primary winding in a manner that maintains the current in the secondary winding at a constant level.
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Berhane Adolf
General Electric Company
Stephan Steven L.
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