Derivation of Dual-Switch Step-Down DC/DC Converters With Fault-Tolerant Capability

PROJECT TITLE :

Derivation of Dual-Switch Step-Down DC/DC Converters With Fault-Tolerant Capability

ABSTRACT:

This letter presents a graph-theoretic approach to deriving a family of dual-switch step-down dc/dc converters with fault-tolerant capability. The constraint sets within the derivation process guarantee that minimum extra component is employed to realize fault-tolerant operation. The operation of converters derived is versatile. Beneath traditional operating conditions, one of the two switches can function a main switch to manage the ability flow (i.e., single-switch converter operation) and the opposite switch is in stand-by mode. When a fault occurs on the most switch, the opposite switch will be activated to provide an alternate current path to continue converter operation and maintain output regulation. The fault-tolerant converters are derived by integrating a buck converter with a buck-boost converter. They share all the components except for the ability switches. Due to different duty cycles required between the 2 operating conditions, a feedback controller is necessary to regulate the duty cycle for tight output regulation. The derivation procedure and experimental results on fault prevalence are reported. The converter derivation approach is ready to spot reported topologies and will be extended to synthesize different topologies with fault-tolerant capability.

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