Detection circuit for maximum value of three phase signal and detection method of the same
AssigneeSony Corporation
InventorYasuhiko Matuyama
Life of this patent
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Abstract
A detection circuit for a maximum amplitude value of a 3-phase signal wherein the three phase-signals having a phase difference of 120° from each other is converted to sampling data of digital values by an A/D converter circuit in every sampling period properly decided, and after that, when the coincidence of the values of any two phase-signals among three phase-signals is detected, the value of the remaining one phase-signal is taken as the maximum amplitude value. Thereby, an accurate maximum amplitude value can be obtained.
Claims9
A detection circuit for generating a digital value corresponding to a 3-phase signal, comprising:
- a comparison means for comparing the amplitude values of a first phase signal, a second phase signal, and a third phase signal of a 3-phase signal;
- and
- a maximum amplitude decision means operatively coupled to the comparison means for determining a maximum amplitude value of the first phase signal when the values of the second and third phase signals coincide with each other.
A detecting method of a maximum amplitude value of a 3-phase signal comprising the steps of:
- comparing the values of three separate phase-signals by comparing the first with the second, the first with the third, and the second with the third,
- determining when the values of any two phase-signals among said three-phase signals coincide with each other, and
- selecting the amplitude value of the remaining phase-signal as the maximum amplitude value.
Dependencies are inferred from the claim text.