Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1988-11-08
1989-08-22
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
318811, H02M 7529
Patent
active
048601861
ABSTRACT:
A PWM controller for a PWM inverter, in which a phase counter counts synchronous pulses having a frequency proportional to that of the inverter to a phase signal, and PWM pattern data is read out of a memory such as ROM by addressing using a pattern selection signal and the phase signal, in which a distributor distributes the PWM pattern data by upper bit of the phase signal to output PWM signals for controlling the inverter, and a modulation counter counts the synchronous pulses or asynchronous pulses selected by a mode signal to output a counted value to the memory, in which the counted value of the modulation counter is used instead of lower bit of the phase signal to selectively output the PWM signals of a synchronous or asynchronous PWM control.
REFERENCES:
patent: 4099109 (1978-07-01), Abbondanti
patent: 4615000 (1986-09-01), Fujii et al.
patent: 4720777 (1988-01-01), Yokoi
patent: 4779183 (1988-10-01), Mutoh et al.
patent: 4802077 (1989-01-01), Fujii et al.
Abbondanti, "A Digital Modulator Circuit for PWM Inverters", IEE-IAS Conf. Paper, pp. 493-501, 1978 Meeting, Toronto Canada (Oct. 1-5, 1978).
Ambo Tatsuaki
Maekawa Katsumi
Beha Jr. William H.
Kabushiki Kaisha Toshiba
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