Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1989-09-06
1990-12-18
Beha, Jr., William H.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318811, 363 36, 363 41, H02P 763, H02M 5452
Patent
active
049788949
ABSTRACT:
In a power converter apparatus, variations contained in a single-phase AC input voltage cause a beat phenomenon in a three-phase DC/AC inverter. To avoid such a beat phenomenon, the single-phase AC input voltage is converted into a DC input voltage having ripple components and the ripple components are filtered from the input voltage so as to derive an input DC voltage. The input DC voltage is inserted into a three-phase AC voltage. Variations contained in the single-phase AC input voltage are detected to obtain a variation detecting signal and the inversion is controlled in a pulse width modulation control mode based upon the variation detecting signal and a reference signal.
REFERENCES:
patent: 4247888 (1981-01-01), Angquist
Nakamura et al., "Restraint Method of Beat Phenomenon on Converter-Inverter System," UDC, vol. 109, No. 5, May 1989, pp. 363-369.
Beha Jr. William H.
Kabushiki Kaisha Toshiba
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