Multi-phase carrier signal generator and multi-phase carrier signal generation method
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United States of America Patent
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May 23, 2006
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app pub date -
Jan 26, 2005
filing date -
Jan 27, 2004
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Abstract
A carrier signal generation section is provided for each of U, V, and W phases, and each of the carrier signal generation sections has an up-down counter for counting clock signals output from a clock generator. An initial value is set for each of the up-down counters. When the up-down counters are simultaneously started by method of a count start signal output from a CPU, the respective up-down counters start counting operations from the respective initial values, perform cumulative subtraction until the count value reaches an upper limit, and perform cumulative addition until the count value reaches a lower limit. As a result, triangular wave carrier signals Cu, Cv and Cw of respective phases having a predetermined phase difference can be readily generated with high accuracy.
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