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US 5,672,963 AGranted
Variable induction control led transformer
AssigneeIllinois Tool Works Inc.
InventorsDon J. Corrigall, Jon O. Reynolds, Richard M. Hutchison
Life of this patent
Estimating the term…
Abstract
An operator controllable transformer having a variable inductor with a control coil is provided. The transformer includes phase control circuitry to control the output of the transformer by phase controlling current flow in the control coil, thereby controlling the current provided to the load.
Claims11
An operator controllable transformer comprising:
- a transformer having at least one secondary winding;
- a variable inductor in series with the at least one secondary winding, the variable inductor having an inductor control winding;
- a first load terminal in series with the variable inductor;
- and
- a second load terminal in series with the at least one secondary winding.
- a control coil circuit in series with the inductor control winding, wherein the control circuit includes a switch configured to open and close circuit the inductor control winding wherein the switch is a phase controlled switch.
3 more elements
A method for controlling a transformer having a transformer secondary in series with a pair of load terminals and a variable inductor having a control winding, comprising the steps of;
- generating a timing signal;
- and
- phase controlling a current through the inductor control winding and an output of the transformer in response to the timing signal.
Dependencies are inferred from the claim text.