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VARIABLE SPEED DRIVE WITH PULSE-WIDTH MODULATED SPEED CONTROL

  • US 20100083693A1
  • Filed: 10/02/2009
  • Published: 04/08/2010
  • Est. Priority Date: 10/03/2008
  • Status: Active Grant
First Claim
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1. A system for powering a compressor of a chiller system, drive system comprising:

  • a variable speed drive, the variable speed drive being configured to receive a fixed input AC voltage and provide an output AC power at a variable voltage and variable frequency, the variable speed drive comprising;

    a converter connected to an AC power source providing the input AC voltage, the converter being configured to convert the input AC voltage to a DC voltage;

    a DC link connected to the converter, the DC link being configured to filter and store the DC voltage from the converter ; and

    an inverter connected to the DC link;

    a motor connectable to the compressor for powering the compressor; and

    a controller configured to control switching of switches in the converter and the inverter, the controller configured to apply randomized pulse width modulation to vary the switching frequency of the switches in the converter and the inverter at each switching cycle.

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