Adjustable voltage power supply
AssigneeRobicon Corporation
InventorRonald C. Blackmond
Life of this patent
Estimating the term…
Abstract
An adjustable voltage alternating current power supply is provided which is especially suitable for supplying loads of variable resistance. The power supply consists of a transformer having two secondary windings with solid-state switches for alternatively connecting the secondary windings in either parallel or series, and with a firing control circuit for changing the connection of the windings from parallel to series at a predetermined point in each half-cycle of the voltage to adjust the effective output voltage so that constant output power can be maintained, or the output power can be varied in any desired manner.
Claims7
An adjustable voltage alternating current power supply comprising two similar, substantially constant voltage sources, switching means for alternatively connecting said voltage sources in parallel or in series for connection to a load, and means for controlling said switching means to switch said voltage sources between parallel and series connections at predetermined points in each half-cycle of the applied voltage wave.
An adjustable voltage alternating current power supply comprising transformer means having two substantially identical output windings, solid-state switching means for alternatively connecting said output windings in parallel or in series for connection to a load, and means for controlling said switching means to change the connection of the output windings from parallel to series at a predetermined point in each half-cycle.
Dependencies are inferred from the claim text.