US PATENT SUBCLASS 323 / 237
.~ Phase controlled switching using electronic tube or a three or more terminal semiconductive device

Current as of: June, 1999
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323 /   HD   ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS

234  DF  OUTPUT LEVEL RESPONSIVE {6}
237.~ Phase controlled switching using electronic tube or a three or more terminal semiconductive device {8}
238  DF  .~.~> With soft start
239  DF  .~.~> Including single unidirectional element with bidirectional pass
240  DF  .~.~> Including saturable inductor in trigger circuit
241  DF  .~.~> With digital control
242  DF  .~.~> Including ramp generator or controlled capacitor charging {1}
244  DF  .~.~> With synchronization
245  DF  .~.~> With nonelectrical condition sensing
246  DF  .~.~> With plural condition sensing

DEFINITION

Classification: 323/237

Phase controlled switching using electronic tube or a three or more terminal semiconductive device:

(under subclass 234) Subject matter wherein the input is alternating current and the final control device is an electronic tube or three or more terminal semiconductive device which is caused to change to its conductive state at a controllable point following the zero axis crossing of the input waveform.

SEE OR SEARCH THIS CLASS, SUBCLASS:

300, for input level responsive phase controlled switching systems.

320, for external or operator controlled phase controlled switching systems.

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

447+, for semiconductor controlled rectifiers which are involved in phase switching.