US PATENT SUBCLASS 363 / 118
.~.~.~.~ Phase angle control

Current as of: June, 1999
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363 /   HD   ELECTRIC POWER CONVERSION SYSTEMS

13  DF  CURRENT CONVERSION {25}
111  DF  .~ Using electronic tube converter {4}
114  DF  .~.~ In rectifier systems {2}
116  DF  .~.~.~ With discharge control means (e.g., grid) {3}
118.~.~.~.~ Phase angle control

DEFINITION

Classification: 363/118

Phase angle control:

(under subclass 116) Subject matter wherein the control of the electronic tube is accomplished by controlling the phase of an A.C. current or voltage applied to the discharge control means with respect to the cathode-anode voltage.

(1) Note. This subclass includes (1) systems wherein both an A.C. current or voltage and a D.C. current or voltage are applied to the discharge control means and (2) systems wherein one or more A.C. currents or voltages are applied to the discharge control means, provided that conductivity of the electronic tube is controlled by varying the phase of the A.C. voltage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

117, for those systems wherein the conductivity of the electronic tube is controlled by both varying the magnitude of a D.C. or voltage applied to the discharge control means and by controlling the phase of an A.C. or voltage applied to the discharge control means.

SEE OR SEARCH CLASS

315, Electric Lamp and Discharge Devices: Systems, appropriate subclasses for miscellaneous systems for supplying current to an electronic tube of the gas or vapor type which has a discharge control means, (e.g., grid, igniter, magnetic field). Many of the systems inherently operate to convert A.C. to D.C. and many of the tubes are referred to as rectifiers, and are therefore closely analogous to the systems in this and the indented subclass. Note, especially

194+, where the supply circuit is an alternating current supply circuit and the system includes means to shift the phase of the current or potential applied to the discharge control means with respect to the anode-cathode current to control the tube, for the line between Classes 315 and 363, see the class definition, Lines With Other Classes.

323, Electricity: Power Supply or Regulation Systems, 237, 300, and 320 for electronic tube voltage magnitude control systems having phase control of the A.C. or voltage applied to the discharge control device of the tube.

327, Miscellaneous Active Electrical Nonlinear Devices,

Circuits, and Systems,

231+, for miscellaneous tube phase shift or control circuits.