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Isolated DC-DC converter

  • US 10,622,908 B2
  • Filed: 12/29/2017
  • Issued: 04/14/2020
  • Est. Priority Date: 09/19/2017
  • Status: Active Grant
First Claim
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1. An isolated DC-DC converter, comprising:

  • an input node configured to have an input voltage;

    a transformer including a primary side having first and second terminals and a primary ground terminal;

    first and second high-side switches, the first high-side switch coupled between the first terminal and the input node, and the second high-side switch coupled between the second terminal and the input node;

    first and second voltage limiters;

    a first low-side switch coupled between the first terminal and the primary ground terminal, the first low-side switch having a gate coupled through the first voltage limiter to the second terminal;

    a second low-side switch coupled between the second terminal and the primary ground terminal, the second low-side switch having a gate coupled through the second voltage limiter to the first terminal; and

    a switch controller configured to;

    close the first high-side switch to cause a first voltage across the first high side switch to be zero;

    during a first phase, open the first high-side switch, while keeping the second high-side switch open, to enable a current through the primary side to reduce a second voltage across the second high-side switch to zero by charging the second terminal to the input voltage and discharging the first terminal;

    close the second high-side switch when the second voltage is zero; and

    during a second phase, open the second high-side switch, while keeping the first high-side switch open, to enable the current through the primary side to reduce the first voltage to zero by charging the first terminal to the input voltage and discharging the second terminal.

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