Implementação de chaves de estado sólido em conjunto com chaves eletromecânicas para acionamento de cargas

Abstract

This study introduces the design of a hybrid relay for the start-up of three-phase induction motors. It begins with a literature review addressing the key project aspects to be defined, such as the type of start-up, solid-state switches, and the types of drives available in the literature and technical documentation, focusing on the main types of solid-state switches with an emphasis on compactness and reliability. The paper mainly concentrates on the actuation of the solid-state switch itself in this context. The development of the hybrid relay describes its characteristics, additional applications, and advantages, including a brief mathematical approach to the actuation methods of the solid-state switch that fall within the scope of the study. A novel approach is developed for the actuation of the solid-state switch using an alternating current pulse transformer. Considering the need for circuit compactness, this new method allows for better utilization of the pulse transformer's magnetization by avoiding core saturation, leading to a reduction in volume and cost. Subsequently, practical implementation and tests are carried out to ensure the circuit's operation and to analyze its wave characteristics.