Electric power supply circuit capable of reducing a loss of elec

Electric power conversion systems – Current conversion – Having plural converters for single conversion

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363 71, 363 95, H02M 328

Patent

active

046444580

ABSTRACT:
In an electric power supply circuit comprising a plurality of constant current units each of which is controllable by a control voltage (V.sub.c) to keep a circuit output current (I.sub.OUT) substantially constant and which has no shunt resistor, the control voltage is supplied from a single current to voltage converter (44) operable in response to a control current (I.sub.c) corresponding to the circuit output current. A control unit (39) produces the control current in response to a detection signal supplied from a current detector (37) and representative of a result of detection of the circuit output current. A plurality of current detectors may be coupled to a plurality of control units coupled in common to the single current to voltage converter. The single current to voltage converter may be a saturable reactor, a resistor, or the like. Alternatively, each of the constant current units may comprise a shunt resistor when the shunt resistor is connected in series to a current restriction circuit coupled to an additional winding attached to the current detector.

REFERENCES:
patent: 3818307 (1974-06-01), Hamilton et al.
patent: 4062057 (1977-12-01), Perkins et al.

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