Apparatus and method for controlling the operating frequency of

Apparatus and method for supplying DC power source

Apparatus and method for virtually shielding a synchronous...

Apparatus and method of sensorless control for synchronous...

Apparatus and method to reduce common mode voltage from current

Apparatus for controlling an A.C. powered elevator

Apparatus for controlling reactive power in a HVDC system

Apparatus for conversion of a three-phase voltage into an isolat

Apparatus for electrical power transmission

Apparatus for powering a transmitter from a switched leg

Apparatus for stabilizing turbine-generator shaft torsional osci

Arrangement of a valve stack for high voltage direct current in

Asymmetrical power converting apparatus employing...

Auto-ranging power supply

Auto-stabilized high power electric generator especially adapted

Autotuned resonant power source

Backup power stage associated with a dual input power supply...

Ballast dimmer with passive power feedback control

Ballast shut-down circuit responsive to an unbalanced load condi

Ballast shut-down circuit responsive to an unbalanced load condi