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Current controller for controlling a current flowing in a load using a PWM inverter and method used thereby

  • US 5,463,299 A
  • Filed: 09/13/1993
  • Issued: 10/31/1995
  • Est. Priority Date: 06/07/1989
  • Status: Expired due to Fees
First Claim
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1. A current controller including:

  • modulating means for which employs a pulse width modulation signal having a first period with which a current change is periodically repeated and in which a plurality of pulses with a second period are included, for modulating a current within said first period by said pulse width modulation signal;

    detection means for detecting a current in a load at least once within said second period;

    means for producing said pulse width modulation signal in accordance with a current flow rate in order to make said detected current agree with a command value;

    assumed response generating means for generating an assumed response as a current response within said first period in accordance with a command current;

    load model means for finding said current flow rate in accordance with an initial value stored in a readable and writable memory element in order to flow a current corresponding to said assumed response; and

    means for modifying the initial value of said load model means in accordance with the difference between said detected current and said assumed response output, and generating the necessary current flow rate at said second period as time elapses after the start of said first period.

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