A Novel Real-Time Fast Fault-Tolerance Diagnosis and Fault Adjustment Strategy for m-Phase Interleaved Boost Converter

Abstract

In order to address the problem of power transistor fault in interleaved boost converter (IBC) of any interleaved phase, we propose a real-time fast diagnosis and fault-tolerant method of power transistor. With the single boost converter as the object, we analyze the logical relationship between inductor voltage and drive signal under continuous conduction mode (CCM) and dis continuous conduction mode (DCM). To reduce the cost, the inductor voltage can be obtained based on the winding applied on the toroidal inductor, which does not require introducing additional measurement component. The fault is supervised in a real-time manner, which makes the online processing of fault possible. Considering that the current is no longer symmetrical after removing fault, which will cause increase of harmonic content in the output fault, this article proposes a strategy to adjust the phase and frequency, and this method can realize operation of interleaved converter with reduced interleaving phase, thus reducing the influence of fault to the minimum. Finally, the accuracy and effectiveness of fault diagnosis and fault tolerance are proved by simulation and experiment, and the effectiveness of adjustment strategy after the fault is also verified.

Keywords

• Interleaved boost converter
• power transistor fault
• real-time fault detection
• fault adjustment strategy