Circuit design and implementation of fault-tolerant step-up converter with variable voltage gain,International Journal of Circuit Theory and Applications

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Circuit design and implementation of fault-tolerant step-up converter with variable voltage gain
International Journal of Circuit Theory and Applications ( IF 1.8 ) Pub Date : 2022-08-12 , DOI: 10.1002/cta.3405
Farid Mohammadi ₁ , Hasan Rastegar ₁ , Mohammad Pichan ₂

Affiliation

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.

中文翻译：

可变电压增益容错升压变换器电路设计与实现

在本文中，提出了一种能够在开路和短路开关故障下安全运行的容错 (FT) DC-DC 转换器。本研究基于交换机故障后的重新配置策略，无需使用任何额外的硬件。为了维持正常运行，设计的拓扑在各种开关故障条件下重新配置。使用简单的建议控制单元，可以在健康和故障条件下快速检测和调节所需的输出电压。可重新配置的能力允许转换器在开关故障后不间断地运行，并且功率流将是连续的。在连续电流模式 (CCM) 下研究开关故障下升压 DC-DC 转换器的 FT 操作和重构能力。针对 FT 操作详细分析和设计了一对熔丝-MOSFET。所提出的 FT 变换器已被放置在集成的无变压器并网光伏系统中，并且已经进行了仿真测试以确认变换器在并网光伏系统应用中的性能。此外，在原型上进行的实验结果证明了所提出的转换器在降低低功率应用中与功率转换器相关的损耗方面的有效性。

更新日期：2022-08-12

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