Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1977-10-31
1979-01-16
Shoop, William M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363132, H02M 7537
Patent
active
041352351
ABSTRACT:
A DC to AC converter capable of producing up to three-tier waveforms includes a first transistorized switching amplifier operable to a first condition, for charging a first capacitor to +2E volts, concurrent with applying +E volts to a first terminal, and connecting a DC supply of -E volts to the positive plate of, and in series circuit with, a second capacitor (previously charged to have a voltage drop thereacross of -2E volts), the series circuit being connected between a reference and second terminals, for applying -3E volts to the second terminal. The first switching amplifier is operable to a second condition for charging the second capacitor to -2E volts, concurrent with applying -E volts to the second terminal, and applying +E volts to the negative plate of the first capacitor, the positive plate of which is connected to the first terminal, for applying +3E volts to the first terminal. A second transistorized switching amplifier is operable to a first or second condition, for individually connecting the first and second terminals to an output terminal, respectively. A control circuit is used to operate the first and second switching amplifiers in various combinations of their respective first and second conditions, over a period of time, for producing a desired waveform at the output terminal. Two or more of the converters can be interconnected and driven by the control circuit for providing polyphase voltage waveforms.
REFERENCES:
patent: 3248633 (1966-04-01), Guarrera
patent: 3371232 (1968-02-01), Hannan et al.
patent: 3851182 (1974-11-01), Wallace
Exxon Research & Engineering Co.
Shoop William M.
Watov Kenneth
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