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Isolated high frequency DC/DC switching regulator

  • US 10,090,769 B2
  • Filed: 11/29/2016
  • Issued: 10/02/2018
  • Est. Priority Date: 11/29/2016
  • Status: Active Grant
First Claim
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1. A driver circuit for a first n-type power transistor in an H-bridge circuit, the H-bridge circuit comprising the first n-type power transistor and a second n-type power transistor, the H-bridge circuit coupled to first and second terminals of a miniaturized transformer that is coupled to operate at a very high frequency (VHF), the driver circuit comprising:

  • a first p-type transistor and an n-type transistor coupled between an upper rail and a lower rail, an output taken between the drains of the first p-type transistor and the n-type transistor being coupled to a gate of the first n-type power transistor;

    a sample-and-hold capacitor coupled to capture a drain voltage for the first n-type power transistor on a first edge of a control signal for the first n-type power transistor;

    a comparator coupled to compare the captured drain voltage to a lower rail on a given edge of a clock signal and to provide a comparator value;

    an up/down counter coupled to receive the comparator value, to adjust a counter value responsive to receiving the comparator value and to output the counter value; and

    a first timing circuit coupled to receive the counter value and to send an adjustable pulse towards a gate of the first p-type transistor and a gate of the n-type transistor.

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