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Power converter with adaptive zero-crossing current detection

  • US 10,116,211 B2
  • Filed: 10/28/2015
  • Issued: 10/30/2018
  • Est. Priority Date: 02/11/2015
  • Status: Active Grant
First Claim
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1. A power converter, comprising:

  • a first transistor, coupled between a VDD supply voltage and a common node;

    a second transistor, coupled between the common node and a ground voltage, wherein the common node has a reactive voltage, and a reactive current flows through the common node;

    a PWM (Pulse Width Modulation) controller, selectively enabling and disabling the first transistor and the second transistor according to a second control signal and a first transistor control signal;

    a low-pass filter, coupled between the common node and an output node; and

    a delay controller, generating the second control signal according to a first control signal, wherein the delay controller comprises;

    a first comparator, comparing the reactive voltage with a reference voltage so as to generate the first control signal; and

    a delay unit directly connected to an output of the first compactor, directly delaying the first control signal for a first delay time so as to generate the second control signal.

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