Circuit design and implementation of fault‐tolerant step‐up converter with variable voltage gain. (12th August 2022)

• Record Type: Journal Article
• Authors: Mohammadi, Farid; Rastegar, Hasan; Pichan, Mohammad
• Is Part Of: International journal of circuit theory and applications. Volume 50:Number 12(2022)
• Page Start: 4395
• Page End: 4418
• Publication Date: 2022-08-12
• Subjects: a fault‐tolerant (FT) DC–DC converter -- continuous current mode (CCM) -- reconfiguration capability -- switch failures -- voltage gain; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.3405
• Languages: English
• ISSNs: 0098-9886

Abstract

Abstract: In this paper, a fault‐tolerant (FT) DC–DC converter that is capable of safe operation under open‐circuit and short‐circuit switch failures is presented. This study is based on reconfiguration strategy after a switch failure without employing any additional hardware. To maintain normal operation, the designed topology is reconfigured under various switch‐fault conditions. Using the simple proposed control unit, it is possible to fast detect and regulate the desired output voltage in both healthy and faulty conditions. The reconfigurable capability allows the converter to operate uninterrupted after a switch fault, and the power flow will be continuous. FT operation and reconfiguration capability of a step‐up DC–DC converter under switch failures are investigated in continuous current mode (CCM). A fuse–MOSFET pair is analyzed and designed for FT operation in details. The proposed FT converter has been placed in an integrated transformerless grid‐connected PV system, and simulation tests have been performed to confirm the performance of the converter in the application of a grid‐connected PV system. Also, experimental results carried out on a prototype demonstrate the effectiveness of the proposed converter in reducing losses associated with power converter in low‐power applications. Abstract : In this paper, an FT DC–DC converter that is capable of safe operation under open‐circuit and short‐circuit switch failures is presented. This study is based on a reconfiguration strategy after a switch failure without employing any additional hardware. The simple proposed control detects and regulates the desired output voltage in healthy and faulty conditions. Experimental results demonstrate its effectiveness in low‐power applications.