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A Novel Control Method to Minimize Distortion in AC Inverters

Written by Dennis Gyma

Keysight Technologies

In PWM AC inverters, the duty-cycle modulator transfer function must be highly linear to achieve low distortion. Current-mode (CM) control, inherently non-linear, is needed to actively "damp" otherwise high-Q LC noise-reduction filters. A novel current-mode control approach is proposed which tailors external ramp characteristics to achieve "perfect" transfer function linearity regardless of duty cycle, and guarantee sub-harmonic stability. Supporting mathematical analysis and prototype measurements are included.

The method when applied to DC/DC converters provides fixed gain-bandwidth in the continuous conduction mode over a broad line and load range.

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Руководство по применению 2004-02-20

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