Browse Prior Art Database

Frequency Converter/Power Multiplier

IP.com Disclosure Number: IPCOM000076848D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Johnson, AR: AUTHOR

Abstract

This system converts a multiple phase, low-frequency source to high power, single phase and high frequency.

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Frequency Converter/Power Multiplier

This system converts a multiple phase, low-frequency source to high power, single phase and high frequency.

A low-frequency source, e. g. 60Hz, not shown, provides 30 input voltages ea, eb, ec to the input terminals A', B', C' of converter 10. Transformer T1 of converter 10 has an iron core 11 and a secondary winding 12 which are common to its multiple primary windings, e.g. windings A1-A4, of each of the identical transistorized switching assemblies A, B, C.

Each of the primary windings, e. g. windings A1-A4, is connected to a series connected current switch, e. g. transistors 1-4 and appropriately poled rectifier, e.
g. diodes D1-D4. The diodes protect the transistors from becoming forward biased. Additional transistors can be provided to increase the current and/or voltage handling capabilities of each switch assembly. For example, one or more additional transistors can be connected in parallel with each transistor, e. g. transistor 1, to increase the current handling capability, and/or likewise, one or more additional transistors can be connected in series to each transistor, e. g. transistor 1, to increase the voltage handling capability. The transistors of assemblies A, B, C are controlled by control pulses applied to their respective control transformers, e. g. transformers 13, connected across their respective base and emitter electrodes. If desired, capacitors C1 may be provided across the primary windings as a current diverter for the switching transistors during turn off.

A typical control sequence for the transistors of Fig. 1 is shown in Fig. 2, axis
17. It provides seven cycles of output signal e...