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Synchronous switching cascade connected offline PFC-PWM combination power converter controller

  • US 5,565,761 A
  • Filed: 09/02/1994
  • Issued: 10/15/1996
  • Est. Priority Date: 09/02/1994
  • Status: Expired due to Term
First Claim
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1. A synchronous switching cascade connected power converter for generating an output voltage in response to an input voltage, comprising:

  • a. means for receiving an input voltage;

    b. a first power factor correction converter stage coupled to the means for receiving and including a first switch;

    c. at least one or more additional converter stages coupled in cascade to the first power factor correction converter stage, each additional converter stage having a switch; and

    d. means for controlling the switches coupled to the first switch, the switch of each additional stage and the output voltage for synchronously switching the first switch and the switch of each additional stage in response to a single clock reference signal, the first switch having a first varying duty cycle which is controlled by the means for controlling and varies in response to changes in the input voltage for maintaining a constant output voltage, the switches of each of the additional stages having a second fixed duty cycle which is also controlled by the means for controlling.

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