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Non-linear carrier controllers for high power factor rectification

  • US 5,867,379 A
  • Filed: 01/12/1995
  • Issued: 02/02/1999
  • Est. Priority Date: 01/12/1995
  • Status: Expired due to Fees
First Claim
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1. In a boost rectifier a method to emulate a resistive load on the input power line comprising the steps of:

  • sensing a current of a switching means which is located inside the rectifier;

    integrating the sensed switch current to compute a voltage (Vq);

    sensing a negative of the rectifier output voltage and summing it with a reference voltage thereby yielding an error voltage;

    amplifying the error voltage with a voltage loop error amplifier to obtain a carrier generator input voltage (Vm);

    generating a non-linear carrier waveform (Vc (t)) whose amplitude is proportional to the carrier generator input voltage (Vm) according to the formula;

    ##EQU19## where t=time from the beginning of the switching period and Ts =the switching period;

    using a clock to set a flip flop to turn on the switching means at the beginning of each switching period; and

    comparing Voltage (Vq) with non-linear carrier waveform (Vc (t)) and resetting the flip flop to turn off the switching means when (Vq) exceeds (Vc (t)).

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