US PATENT SUBCLASS 363 / 157
FREQUENCY CONVERSION (f1-f2) WITHOUT INTERMEDIATE CONVERSION TO D.C.

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

157FREQUENCY CONVERSION (f1-f2) WITHOUT INTERMEDIATE CONVERSION TO D.C. {7}
158  DF  .~> By varactor
159  DF  .~> By semiconductor converter {2}
164  DF  .~> With automatic voltage magnitude control
165  DF  .~> With automatic frequency control
166  DF  .~> By electron tube converter {1}
170  DF  .~> By induction-type converter {3}
177  DF  .~> By circuit interrupter converter

DEFINITION

Classification: 363/157

FREQUENCY CONVERSION (f1-f2) WITHOUT INTERMEDIATE CONVERSION TO D.C.:

(under the class definition) Subject matter wherein an input alternating current having a first value of frequency is converted directly into an output alternating current having a second value of frequency.

(1) Note. The output frequency may be either greater or

less than the input frequency.

(2) Note. See the classes referred to in the class definition, under References To Other Classes, for analogous conversion systems in the communication arts.

SEE OR SEARCH THIS CLASS, SUBCLASS:

8, for the systems wherein an alternating current of a first frequency is converted to an alternating current of a second frequency and then converted to direct current or vice versa (e.g., f1-f2-D.C. or D.C.-f1-f2).

9, for those systems wherein an input alternating current having a first frequency and a first number of phases is converted into an output alternating current having a second frequency and a second number of phases.

37, and 38, for the systems wherein an alternating current of a first frequency is rectified and the resulting direct current is derectified and converted into an alternating current of a second frequency (e.g., f1-D.C.-f2). SEE OR SEARCH CLASS

322, Electricity: Single Generator Systems,

14+, for generator systems wherein the output frequency may be controlled by combined control of generator and driving means; subclasses 29+ for automatic control of generator or driving means responsive to generator frequency; and subclasses 38+ for systems wherein the output frequency may be controlled by controlling the generator driving means.

329, Demodulators,

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

331, Oscillators, appropriate subclasses for oscillator systems having an output frequency which is a beat frequency or a function of a control frequency; see particularly

37+, for beat frequency systems wherein two sources of different frequencies are combined in a nonlinear device to produce a difference (sometimes sum) frequency; subclass 47 for plural oscillator systems wherein one oscillator varies the frequency of another; subclass 51 for cascaded oscillators of the frequency dividing type; subclass 53 for cascaded oscillators of the frequency multiplying type; subclasses 76 and 77 for oscillators combined with a particular harmonic producing or selecting network; subclasses 128 and 165+ for shock-excited resonant systems; and subclasses 145, 149, 153, and 172+ for oscillator systems

of the electrically pulsed type.