Pulse width modulated inverter system for driving single phase a

Details Pulse width modulated inverter system for driving single phase a Pulse width modulated inverter system for driving single phase a

1985-11-29

1987-11-10

Salce, Patrick R.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 98, 363 41, H02M 7538

Patent

active

047061804

ABSTRACT:
A substantially perfect single phase sinusoidal shaped voltage waveform may be generated for driving a single phase a-c induction motor by employing a sinusoidally weighted pulse width modulated signal to switch a pair of solid state power switches on and off in alternation in order to connect the motor alternately across positive and negative power supplies. A low pass filter is effectively connected in series with the single phase motor to filter out all of the signal components except the fundamental of the sine wave modulating frequency. In this way, only a sinusoidal voltage is applied to the motor. By making the switching frequency very high relative to the sine wave modulation component, the filter size and cost are minimized and it is unnecessary to correlate or synchronize the sine wave modulation and switching frequencies.

REFERENCES:
patent: 3875483 (1975-04-01), Farr
patent: 4024444 (1977-05-01), Dewan et al.
patent: 4330817 (1982-05-01), Avar et al.
patent: 4409534 (1983-10-01), Bose
patent: 4419615 (1983-12-01), Muto et al.
patent: 4445167 (1984-04-01), Okado
patent: 4447786 (1984-05-01), Saar et al.
patent: 4519022 (1985-05-01), Glennon
patent: 4591964 (1986-05-01), Kemstedt

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