System and method for reducing delay in the modulation of a multi-phase output voltage from an inverter
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United States of America Patent
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Dec 27, 2022
Grant Date -
Dec 8, 2022
app pub date -
Jun 4, 2021
filing date -
Jun 4, 2021
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Abstract
A power converter is configured to measure an output current and to determine a multi-phase voltage reference as a function of the output current. Within the same switching period the voltage reference is determined, a modulation routine determines a modulation index for each phase of the output voltage. In some instances, one or more phases must start modulation during the switching period before the new modulation index is determined. The modulation routine stores the value of the modulation index generated from the prior switching period and uses the stored value when a new value is not yet ready. An offset value for the phase voltage which used a modulation index from the prior switching period is determined in order to compensate the phase voltages of the other phases and to maintain a desired line-to-line voltage output from the power converter.
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