Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1992-12-07
1995-09-12
Stephan, Steven L.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 58, 363 98, 363132, H02M 112
Patent
active
054503060
ABSTRACT:
A closed loop pulse width modulator (PWM) inverter corrects for variations and distortion in the output AC voltage waveform caused by non-linearities of the switching devices or changes in the DC link voltage. A signal is generated that is a volt-seconds representation of the voltage error between a voltage command and the actual AC output voltage of the PWM inverter. The volt-seconds error signal becomes a controlling means in the closed loop of the PWM inverter to regulate the output AC voltage of the PWM inverter. Another signal that represents changes in the DC link voltage also modifies the voltage command signal. The system will compensate for the non-linear behavior of the PWM inverter due to deadtime, minimum on-times and off-times, and DC link voltage variations and voltage drops across the switching devices, and will also allow the operation of the inverter in a linear fashion for the region of operation when one or more of its phases are saturated, i.e., either full on or full off.
REFERENCES:
patent: 3967173 (1976-06-01), Stich
patent: 4597037 (1986-06-01), Okado
patent: 5099408 (1992-03-01), Chen et al.
patent: 5151637 (1992-09-01), Takada et al.
Garces Luis J.
Sember James W.
Femal Michael J.
Golden Larry I.
Graefe Richard J.
Riley Shawn
Square D Company
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