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Self-driven AC-DC synchronous rectifier for power applications

  • US 8,913,409 B2
  • Filed: 10/06/2010
  • Issued: 12/16/2014
  • Est. Priority Date: 02/12/2010
  • Status: Active Grant
First Claim
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1. A system that facilitates synchronous rectification of an input power signal, comprising:

  • a subset of power switches configured to receive the input power signal and rectify the input power signal to generate a rectified power signal as an output;

    a self-driven gate-drive (SDGD) subsystem configured to facilitate control of respective switching of respective power switches of the subset of power switches, wherein the SDGD subsystem is powered by the rectified power signal or the input power signal, wherein the SDGD subsystem comprises a subset of switches that are configured to form an inverter to facilitate the control of switching of a first power switch of the subset of power switches based at least in part on respective switch states of the subset of switches, wherein the SDGD subsystem is further configured to comprise a set of capacitors comprising a first capacitor, a second capacitor, and a third capacitor, and the SDGD subsystem controls respective charging of the first capacitor, the second capacitor, and the third capacitor to charge the first capacitor to a first voltage that is higher than a second voltage of the second capacitor before the third capacitor is charged to a third voltage that satisfies a threshold to switch the first power switch from a first switch state to a second switch state, and wherein the control of the respective charging of the first capacitor, the second capacitor, and the third capacitor facilitates maintaining the first power switch in the first switch state during a start-up phase of operation of the system until the SDGD subsystem is determined to be operating in steady state; and

    a zero-crossing controller component configured to facilitate supplying a defined positive voltage signal to a comparator of the SDGD subsystem to facilitate the control of a second power switch of the subset of power switches that is associated with the comparator to switch the second power switch from an on state to an off state at or substantially close to a zero-voltage-crossing point at a half-cycle of the input power signal associated with the second power switch.

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