Method and apparatus for regulating the input impedance of PWM converters

  • US 6,307,361 B1
  • Filed: 04/25/2001
  • Issued: 10/23/2001
  • Est. Priority Date: 04/25/2001
  • Status: Expired due to Fees
First Claim
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1. A method for controlling the duty cycle of a duty switch within a boost converter in order to regulate the input impedance of the boost converter, the boost converter having an output voltage and an input current, the method comprising the steps of:

  • (a) providing a ramp signal having a slope determined by the output voltage;

    (b) putting the duty switch into a first state when said ramp signal is reset;

    (c) providing a threshold determined by the input current;

    (d) comparing said ramp signal to said threshold; and

    (e) putting the duty switch into a second state when said ramp signal reaches said threshold.

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