Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-09-21
1990-04-03
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328 31, 307264, 307350, 307529, 332109, H03B 1900, H03L 500, H03K 5153, H03K 700
Patent
active
049143964
ABSTRACT:
A PWM waveform generator generates the digitized waveform which may control an inverter so that the inverter output is pulse width modulated and generates a sine wave after filtering. A frequency controlling means includes a cycle clock cycling an address counter which addresses step data in a ROM, and the ROM data is fed to a PWM counter. This PWM counter has a clock input to reset a flip-flop and the output passes through a polarity switch to obtain the digitized waveform. This frequency controlling means is modified by an amplitude controlling means wherein the PWM counter is clocked at a variable frequency rate to control the width of the pulses directly proportional to the desired effective amplitude of the output waveform. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
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"An Algebraic Algorithm for Microcomputer-Based (Direct) Inverter Pulsewidth Modulation" Yoone Ho Kim/Mehrdad Ehsani, IEEE Transactions on Industry Applications, vol. 1A-23, No. 4, Jul./Aug. 1987; pp. 654-660.
Acme Electric Corporation
Miller Stanley D.
Phan Trong Quang
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