US PATENT SUBCLASS 327 / 451
.~.~.~.~ Zero point switching

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

365  DF  GATING (I.E., SWITCHING INPUT TO OUTPUT) {12}
419  DF  .~ Utilizing three or more electrode solid-state device {7}
438  DF  .~.~ Four or more layer device (e.g., thyristor, etc.) {6}
447  DF  .~.~.~ AC supply {6}
451.~.~.~.~ Zero point switching {1}
452  DF  .~.~.~.~.~> With triac

DEFINITION

Classification: 327/451

Zero point switching:

(under subclass 447) Subject matter wherein the switching device is switched or forward-biased to allow conduction of the AC power through the device's anode-cathode region at the point in time of the AC operating cycle when the AC waveform crosses the zero voltage level (i.e., moving from the negative part of the phase to the positive part of the operating phase or vice-versa).

SEE OR SEARCH THIS CLASS, SUBCLASS:

78+, for amplitude reference crossover detecting and particularly subclasses 79 for amplitude detecting of zero crossover without subsequent control.