Power supply with base drive control
AssigneeHoneywell Information Systems Inc.
InventorsJames H. Gerding, Albert M. Heyman
Life of this patent
Estimating the term…
Abstract
A power supply provides a low-level DC voltage to DC load circuits by first rectifying the standard AC voltage and thereafter reducing the rectified AC voltage to the low-level DC voltage. The reduction of the rectified AC voltage to the low-level DC voltage is accomplished by a power transformer which is switched on or off by a pair of switching transistors. The switching transistors are operated in a "push-pull" mode by a pair of control transformers operating in combination with a control circuit. The control circuit produces various pulse conditions in the control transformers which turn their respective switching transistors on and off in a prescribed manner.
Claims13
A power supply system for converting AC voltage to a low-level DC voltage, said system comprising:
- means for converting the AC voltage to a first DC voltage level,
- means for transforming the first DC voltage level to the low-level DC voltage, said transforming means including a primary winding having a pair of terminals and at least one secondary winding;
- and
- means for applying the first DC voltage level to said means for transforming the first DC voltage level to the low-level DC voltage, said means for applying comprising:
- first and second transistor switching means, each of said switching means including first and second terminals, said first terminal of said first switching means being connected to said second terminal of said second switching means in common with said first terminal of said primary winding, and said second terminal of first switching means being connected to said second terminal of said primary winding and to said first terminal of said second switching means;
- and
- control means for controlling the switching action of said first and second switching means,
- said control means including:
- first means inductively coupled to said first and second terminals of said first transistor switching means;
- second means inductively coupled to said first and second terminals of said second transistor switching means;
- third means connected to said first and second means, said third means being operative to generate first and second sets of pulse signals to be applied to said first means and second means respectively, said first switching means and said second switching means being alternately enabled and disabled in a push-pull mode for operation by said first and second sets of pulse signals respectively.
A power supply system for transmitting a low-level voltage to a plurality of loads, said power supply system comprising:
- transforming means for applying the low-level voltage to said plurality of loads, said transforming means comprising a primary winding and at least one secondary winding;
- first transistor switching means coupled to said primary winding of said transforming means and being operative to conduct current in a first direction through said primary winding;
- second transistor switching means coupled to said primary winding of said transforming means and being operative to conduct current in a second direction through said primary winding, the second current direction being opposite the first current direction;
- and
- means, coupled to said first and second switching means for controlling the switching action of said first and second switching means, said control means comprising:
- two control transformers each with a primary winding and at least two secondary windings;
- said secondary windings from said first control transformer connected in series with said first switching means,
- said secondary windings from said said second control transformer connected in series with said second switching means, and
- means for alternately producing pulse conditions in the primary windings of each of said control transformers.
Dependencies are inferred from the claim text.