Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1981-03-06
1982-09-14
Shoop, William M.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
363164, 323207, 323246, H02M 5257
Patent
active
043498671
ABSTRACT:
A control apparatus for a cycloconverter includes m sets of bridge converters connected between the input terminals of an m-phase load (m.gtoreq.3) and is applied for a cycloconverter of which the common connection point of the bridge converters is disconnected from a neutral point of the load. The output voltage of each bridge converter is controlled by a reference voltage signal during a 1/m period of one cycle of the load voltage. The center of the 1/m period is located at a positive or negative maximum amplitude point of the load voltage. The output voltage is also controlled during the remaining period of (1-1/m) by a phase control input signal corresponding to a difference between a reference current signal and the load current. The reference voltage signal and the phase control input signal are selected by switching signals from a logic circuit for detecting phase voltages of the load to alternately be applied to the phase control circuits.
REFERENCES:
patent: 3609509 (1971-09-01), Lafuze
patent: 3959719 (1976-05-01), Espelage
patent: 3959720 (1976-05-01), Bose et al.
patent: 4013937 (1977-03-01), Pelly et al.
patent: 4074348 (1978-02-01), Salzmann et al.
Cycloconverters and Automatic Control of Ring Motors Driving Tube Mills by Theodore Salzmann; Siemens Review, vol. 45, No. 1, Jan. 1978, pp. 3-8.
Nakajima Kihei
Otsuka Kenichi
Uchino Hiroshi
Shoop William M.
Tokyo Shibaura Denki Kabushiki Kaisha
Wong Peter S.
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