Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1994-04-05
1995-05-30
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 97, 318811, 318812, H02M 5451, H02P 540
Patent
active
054207789
ABSTRACT:
An inverter for driving a motor, when a command frequency is given, the output voltage is increased as output current is increased as to optimize motor efficiency under varying load conditions. The inverter is comprised of a converter to convert an input ac voltage to a dc voltage, a current sensor to measure an output current for determining a load level of the motor, a voltage setting means to calculate a command voltage as a function of a command frequency and the measured current, an encoding means to issue on a real time basis bit patterns containing information on the command frequency and the command voltage, a decoding means to decode the bit patterns into a pulse width modulated (PWM) signal, a clock means to provide a timing signal for the encoding means and the decoding means, and an inverter to modulate the dc voltage by the PWM signal, thereby applying the motor input voltage to the motor.
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Berhane Adolf
Stephan Steven L.
System Homes Company Ltd.
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