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Three-phase pulse width modulation waveform generator

  • US 6,448,827 B1
  • Filed: 11/27/2000
  • Issued: 09/10/2002
  • Est. Priority Date: 11/26/1999
  • Status: Expired due to Fees
First Claim
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1. A three-phase pulse width modulation waveform generator having at least an up-down counting circuitry which comprises:

  • an up-down counter for performing an up-count or a down-count upon an external input of a count clock signal; and

    a count controller having an output side connected to an input side of said up-down counter for sending said input side of said up-down counter a count enable signal which enables said up-down counter to perform said up-count or said down-count;

    wherein said count controller has an input side which is connected to said up-down counter for receiving a count direction switching signal from said up-down counter, so that said count controller changes a cycle for generating said count enable signal in accordance with said count direction switching signal; and

    wherein said input side of said count controller receives said count clock and counts said count clock, so that if a counted value of said count clock by said count controller is made to correspond to a predetermined value stored in said count controller, then said count controller generates said count enable signal.

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