PWM inverter circuit analytically compensating for DC link distortion
AssigneeSundstrand Corporation
InventorMaurice A. Kirchberg
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Abstract
This invention relates to a VSCF system for aircraft power generation having a DC source, the DC source producing a DC signal. An inverter is coupled to the DC source and produces a constant frequency AC signal from the DC signal. It is known that, in converting the DC signal to the AC signal, the inverter distorts the DC signal, producing harmonic content therein. Accordingly, an inverter controller is provided which analytically determines distortion of the DC signal due to inverter action and alters PWM patterns fed to the inverter to precompensate for harmonic content in the DC signal.
Claims20
An AC Power source, comprising:
- inverter means for receiving and applying a PWM pattern to a DC signal to produce an AC signal from said DC signal;
- and
- inverter controller means for analytically determining distortion of said DC signal due to application of said PWM pattern to said DC signal, said inverter control means altering said PWM pattern to precompensate for said distortion.
In a VSCF system having a DC source, said DC source producing a DC signal and inverter means coupled to said DC source for receiving and applying a PWM pattern to said DC signal to produce an AC signal from said DC signal, an inverter controller, comprising:
- means for analytically determining distortion of said DC signal due to application of said PWM pattern to said DC signal, said controller altering said PWM pattern to precompensate for said distortion.
A method for Providing AC power having reduced harmonic content, comprising the steps of:
- analytically determining distortion of a DC signal due to application of a PWM pattern to said DC signal;
- altering said PWM pattern to precompensate for said distortion;
- receiving a DC signal;
- and
- applying a PWM pattern to said DC signal to produce an AC signal from said DC signal.
Dependencies are inferred from the claim text.