US PATENT SUBCLASS 363 / 148
PHASE CONVERSION (Ph1-Ph2) WITHOUT INTERMEDIATE CONVERSION TO D.C.

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

148PHASE CONVERSION (Ph1-Ph2) WITHOUT INTERMEDIATE CONVERSION TO D.C. {5}
149  DF  .~> With automatic voltage magnitude or phase angle control
150  DF  .~> By dynamoelectric machine converter
151  DF  .~> By electron tube converter
152  DF  .~> By induction-type converter {1}
156  DF  .~> By passive phase shift elements

DEFINITION

Classification: 363/148

PHASE CONVERSION (01 - 02) WITHOUT INTERMEDIATE CONVERSION TO D.C.:

(under the class definition) Subject matter wherein a system is provided which converts A.C. having one number of phases into A.C. having a different number of phases without intermediate conversion to D.C.

(1) Note. The output number of phases may be either greater or less than the input number of phases.

(2) Note. This class does not take those systems wherein a plurality of different single phase sources are combined to produce a polyphase output or wherein one or more single phase loads are connected to a polyphase source line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2+, where the system includes means for effecting phase conversion, and also a single current conversion.

9+, where the system includes means for effecting both phase and frequency conversions.

36, where the system includes means for effecting phase conversion, and also plural current conversion.

SEE OR SEARCH CLASS 307, Electrical Transmission or Interconnection Systems,

13+, for plural load circuits connected to a polyphase system; subclasses 43+ for systems interconnecting a plurality of supply circuits; but particularly subclasses 72+ for supplies having unlike electrical characteristics; and subclass 79 for current sources interconnected in series but out of phase with each other.

310, Electrical Generator or Motor Structure,

160, for dynamoelectric frequency converter structure.

315, Electric Lamp and Discharge Devices: Systems,

138+, for electric systems for supplying alternating current to an electric lamp or gas or vapor type electronic tube where the system includes a phase converting means in the supply circuit. Subclass 138 provides for those systems where single phase current is converted to polyphase current.

329, Demodulators,

315+, for frequency demodulators and subclasses 345+ for phase demodulators.

331, Oscillators,

45, for self-sustaining oscillator systems provided with plural output circuits, each output producing a wave of the same frequency, the waves being displaced in phase by a fixed angle (other than phase coincidence or phase opposition) so as to produce a polyphase set of currents or voltages.