Digital control device for an inverse rectifier

Details Digital control device for an inverse rectifier Digital control device for an inverse rectifier

1984-03-28

1985-04-30

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, H02P 540

Patent

active

045146780

ABSTRACT:
The invention relates to a digital control device for an inverse rectifier having controllable switching elements for driving an A.C. motor operable at a variable frequency. The device has a pulse generator for producing timing pulses at a multiple of the frequency of the inverse rectifier frequency and a location counter 26 controlled by the timing pulses. A control store in the form of a ROM has at least two storage zones occupied by different controlling tables of which the data characterizes the periodically changing signal pattern for the ignition and extinction signals of the controlled switching elements of the inverse rectifier. A table selecting apparatus which, depending on setting and operating parameters, delivers a preparatory selecting signal for the desired control table and, after a change in this selecting signal, appropriately switches the storage zone over.

REFERENCES:
patent: 3716775 (1973-02-01), Skogsholni
patent: 4099109 (1978-07-01), Abbondanti
patent: 4099225 (1978-07-01), Nygaard
patent: 4139885 (1979-02-01), Overzet et al.
patent: 4267570 (1981-05-01), Braun
patent: 4290108 (1981-09-01), Woehrle et al.
patent: 4295189 (1981-10-01), Boys
patent: 4348734 (1982-09-01), Dougherty
patent: 4356544 (1982-10-01), Ono et al.
patent: 4364109 (1982-12-01), Okado et al.
patent: 4447786 (1984-05-01), Saar et al.

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