Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1982-09-22
1984-04-24
Shoop, William M.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
318811, 363 41, H02H 7122
Patent
active
044451679
ABSTRACT:
In a PWM voltage type inverter system comprising: a rectifier converting an AC power from an AC power source into a DC power, an inverter bridge converting the DC power from the rectifier into an AC power of a variable frequency to supply it to an AC motor, and a conduction control circuit for controlling the conduction of arms of the inverter bridge normally in a first mode wherein it operates at a frequency determined by a frequency reference signal, a control power circuit is connected to receive the power from the AC power source and the regenerative AC power from the motor and to supply a constant voltage DC power to the conduction control circuit. When power failure is detected, the conduction control circuit is switched to a second mode, wherein it operates in such a manner as to maintain the regenerative voltage at a predetermined value. With the arrangement of the invention, the motor can be kept operating over a longer period of time upon occurrence of power failure.
REFERENCES:
patent: 4364109 (1982-12-01), Okado et al.
1980 National Convention Records S8-543 "A Measure to Counter Power Failure with Variable Power Source", Institute of Electrical Engineers of Japan; Apr. 1980; Toshio Kamifu, Tadao Goshi.
Shoop William M.
Tokyo Shibaura Denki Kabushiki Kaisha
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