Design and Implementation of Multi-Phase Buck-Type Pulse-Current Converter

Abstract

This thesis presents a multi-phase buck-type pulse-current converter For the purposes of high power and high efficiency for laser diodes the large current and the high current slew rate are required to drive the laser diodes Furthermore the output current ripple must be reduced for the great fiber-optical transmission performance However the constant-current operation for the laser diodes causes the temperature rise which further results in the decrease of the light output power In order to maintain the same light output power the operation current must be increased and then the temperature rises again which results in the thermal run away and the damage for the laser diodes Therefore the pulse-current operation for the laser diodes is employed in this thesis to improve the thermal run away In order to generate the pulse current with the characteristics of the shorter rising time and the low current ripple the synchronous control and the interleaving control are employed in the proposed circuit during the rising stage and the constant-current stage respectively Furthermore the low-frequency switch the center-tapped transformer and the feed-forward diode are added to further improve the falling time during the falling stage Finally a prototype circuit of the 30A four-phase buck-type pulse-current converter is built to verify the performances such as the rising time the falling time and the current ripple

Date of Award	2014 Sept 2
Original language	English
Supervisor	Ray-Lee Lin (Supervisor)