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System and device for high-side supply

  • US 10,574,229 B1
  • Filed: 01/23/2019
  • Issued: 02/25/2020
  • Est. Priority Date: 01/23/2019
  • Status: Active Grant
First Claim
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1. An electrical circuit comprising:

  • a ground-referenced power transistor and a non-ground-referenced power transistor configured in a half-bridge topology, the non-ground-referenced power transistor having a first conducting electrode coupled to a high voltage power supply, a control electrode coupled to a high-side pre-driver, and a second conducting electrode coupled to a switch node;

    a boot-strapped capacitor having a bottom plate coupled to the second conducting electrode for providing a floating-ground voltage thereto, and having a top plate coupled to the high-side pre-driver;

    an interface portion including an adaptive boot-strapped capacitor regulator (hereinafter, “

    regulator”

    ), wherein the interface portion selectively turns OFF and ON the ground-referenced power transistor and the non-ground-referenced power transistor;

    a first sense device including a high-voltage, enhancement-mode, GaN HEMT for sensing a voltage at the top plate, having a gate terminal coupled to the regulator, a source terminal coupled to the regulator and a drain terminal coupled to the top plate through a diode;

    a second sense device, coupled to the regulator, for sensing a voltage at the bottom plate; and

    a charging device coupled to the regulator and to the top plate, the charging device for selectively increasing the voltage at the top plate,wherein the regulator controls the charging device based on the voltage at the top plate and the voltage at the bottom plate.

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