Title :
A sensorless continuous and discontinous conduction mode detection method for a synchronous converter using PWM pulse skipping
Author :
Baek, Jongbok ; Choi, Wooin ; Cho, Bohyung
Author_Institution :
Dept. of Electr. Eng., Seoul Nat. Univ., Seoul, South Korea
Abstract :
This paper proposes a sensorless pulse-width modulation (PWM) pulse skipping method for detecting discontinuous or continuous conduction mode in multi-mode synchronous converters. The gate signal of the synchronous rectifier switch is skipped periodically and the output voltage is observed to determine the conduction mode.. The proposed method can determine the optimal conduction mode, which results in improved efficiency over a wide load range. This method is particularly well suited for digital controller implementation and requires only an output voltage sensor. A synchronous buck converter with 20 V/5 A output is built and tested to verify the proposed algorithm´s performance.
Keywords :
DC-DC power convertors; PWM power convertors; PWM rectifiers; digital control; electric sensing devices; switching convertors; PWM pulse skipping; current 5 A; digital controller implementation; gate signal; multimode synchronous converters; optimal conduction mode determination; output voltage sensor; sensorless continuous conduction mode detection method; sensorless discontinuous conduction mode detection method; sensorless pulse width modulation pulse skipping method; synchronous buck converter; synchronous rectifier switch; voltage 20 V; Algorithm design and analysis; Logic gates; Rectifiers; Signal processing algorithms; Switches; Voltage control;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2012 IEEE
Conference_Location :
Raleigh, NC
Print_ISBN :
978-1-4673-0802-1
Electronic_ISBN :
978-1-4673-0801-4
DOI :
10.1109/ECCE.2012.6342161
