Voltage supply circuit responsive to plural possible DC input le

Details Voltage supply circuit responsive to plural possible DC input le Voltage supply circuit responsive to plural possible DC input le

1977-12-13

1979-07-31

Shoop, William M.

Electric power conversion systems

Current conversion

With auxiliary bucking or boosting emf

363 21, 363 97, 363124, H02M 3335

Patent

active

041632788

ABSTRACT:
A voltage supply circuit comprises an input for receiving a DC input voltage having one of plural possible levels; a DC-AC inverter for inverting the DC input voltage and which includes a boosting transformer having a winding with end terminals and an intermediate terminal and an inverter drive circuit for providing an AC current to the transformer; a connection between the input and the intermediate terminal of the boosting transformer for applying the DC input voltage to the latter; and a control circuit for controlling the inverter drive circuit, and which selects between a first condition, in which the inverter drive circuit is made operative so that a boosted voltage is provided at one end terminal of the boosting transformer, and a second condition, in which the inverter drive circuit is made inoperative, so that the DC input voltage introduced at the intermediate terminal is provided as a DC output voltage at the end terminal of the booster transformer. The control circuit can include a zener diode as a level detector to control a switching transistor so that the first and second conditions are selected on the basis of the level of the DC input voltage.

REFERENCES:
patent: 2890403 (1959-06-01), Van Abbe
patent: 3381202 (1968-04-01), Loucks et al.
patent: 3753075 (1973-08-01), Tomura et al.
patent: 3815007 (1974-06-01), Portmann
patent: 3842589 (1974-10-01), Luce et al.

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