US Patent 9608533 Phase control with adaptive parameters

An apparatus to control an amount of current delivered from an AC power source to an electrical load includes a line terminal configured to be connected to the AC power source, a load terminal configured to be connected to the electrical load, a controllably conductive power switch in series electrical connection between the line terminal and the load terminal, and a switching circuit configured to control a conductive state of the controllably conductive power switch wherein the switching circuit is configured to automatically detect at least one electrical characteristic.