Frequency converting device and control method therefor

Details Frequency converting device and control method therefor Frequency converting device and control method therefor

1985-05-22

1987-04-07

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363143, 323299, H02M 545, G05F 500

Patent

active

046565710

ABSTRACT:
A frequency converting device is provided with a converter for converting ac input power into dc power. The device includes an inverter for inverting an output (dc power) of the converter into an ac output power, and adjustment device for adjusting an output waveform of the inverter in accordance with the voltage values of the ac input power. The adjustment device comprises a memory which stores adjustment data corresponding to the voltage value of the ac input power source connected to the converter, and a selector for selecting a certain adjustment data from the memory in accordance with the voltage value of the ac input power to which the device is connected. Thus, even when the voltage of the ac input power is changed, the effective output of the inverter can be kept substantially constant by adjusting on/off times of the switching elements constituting the inverter to vary a duty factor of the inverter output.

REFERENCES:
patent: 3900787 (1975-08-01), Koster
patent: 4088937 (1978-05-01), Uchida et al.
patent: 4238821 (1980-12-01), Walker
patent: 4410937 (1983-10-01), Uesugi
patent: 4513362 (1985-04-01), Aizawa
patent: 4516664 (1985-05-01), Anzai et al.
patent: 4545464 (1985-10-01), Nomura
patent: 4549259 (1985-10-01), Ueda et al.
patent: 4590546 (1986-05-01), Maile
"Automatic Input-Selecting Power Supply", IBM Technical Disclosure Bulletin, vol. 28, No. 3, Aug. 1985.
Bose, Bimal K., "Adjustable Speed AC Drive Systems", IEEE Press, pp. 2-6.

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