(under subclass 137) Systems provided with (1) a source of single phase alternating current and means to convert the single phase current to polyphase alternating currents, or (2) a source of polyphase alternating currents and means to convert the polyphase currents to either single phase currents or polyphase alternating currents of a different number of phases.
(1) Note. Systems under the class definition provided with a single phase source of supply and "phase splitting" means for supplying the load device with polyphase currents are in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
194, and indented subclasses, for systems under the class definition wherein the load device is a discharge control
discharge device having discharge control means, and the control circuit includes means to shift the phase of the control current or voltage with respect to the current flowing in the cathode-anode circuit of the load device. For the line between this subclass (138) and subclass 194 and indented subclasses, see the notes to the definition of subclass 137.
SEE OR SEARCH CLASS
363, Electric Power Conversion Systems, 2+, and the subclasses mentioned in the notes thereto, for systems for converting an alternating current having one number of phases into alternating current having another number of phases either alone or in combination with current and/or frequency conversion.
