Adaptive zero-current switching control scheme for diode emulation operation

Author

Cheung, Chun ; Qiu, Weihong ; Dequina, Noel

Author_Institution

Intersil Corp., North Branch, NJ, USA

fYear

2011

fDate

6-11 March 2011

Firstpage

871

Lastpage

876

Abstract

A voltage regulator typically can achieve higher efficiency at very light load by operating in diode emulation mode rather than in continuous conduction mode. A very common approach to detect zero current crossing is to compare the phase-node voltage with zero volts or a few millivolts (mV) reference voltage. However the parasitic inductance may introduce some extra offset, resulting in early turn-off of the LGATE and extra power losses. The impact of power-train parasitics and operating conditions in diode emulation operation are studied in detail in this paper. A novel technique to compensate these variables and achieve zero-current switching (ZCS) diode emulation operation is presented. Experimental results are provided to verify the concept.

Keywords

adaptive control; field effect transistor switches; switching convertors; voltage regulators; zero current switching; LGATE; adaptive zero-current switching control scheme; continuous conduction mode; diode emulation operation; parasitic inductance; phase-node voltage; power loss; power-train parasitic; voltage regulator; zero current crossing detection; Driver circuits; Emulation; Inductance; Inductors; MOSFET circuits; Switches; Zero current switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744697

Filename

5744697