US PATENT SUBCLASS 363 / 161
.~.~.~ Positive and negative groups

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

157  DF  FREQUENCY CONVERSION (f1-f2) WITHOUT INTERMEDIATE CONVERSION TO D.C. {7}
159  DF  .~ By semiconductor converter {2}
160  DF  .~.~ Thyristor type {1}
161.~.~.~ Positive and negative groups {1}
162  DF  .~.~.~.~> Including blanking or inhibiting means

DEFINITION

Classification: 363/161

Positive and negative groups:

(under subclass 160) Subject matter wherein thyristor type elements are combined in a circuit to form at least two groups, one of which operates during the positive half cycle of an A.C. input and the other during the negative half cycle.

(1) Note. A group may consist of a number of thyristor type elements connected in some well-known rectifier configuration, the output current from a group being able to flow in only one direction.