Thyristor Voltage Equalizing Network for Crowbar Application
Subhash Joshi T.G., Vinod John

TL;DR
This paper introduces a novel design method for dynamic voltage balancing networks tailored for high-voltage thyristor crowbar systems, emphasizing charge-discharge cycles and component tolerances to improve voltage sharing and reduce losses.
Contribution
The paper presents a new design approach for dynamic balancing networks considering gate delay and component tolerances, specifically optimized for crowbar applications where turn-off is not critical.
Findings
The proposed design reduces voltage imbalance in series thyristors during high di/dt operation.
Simulation and experiments confirm improved voltage sharing and reduced losses with the new method.
The approach accommodates propagation delay differences among thyristor drivers.
Abstract
Many high voltage applications are realized with series connected thyristors. Voltage imbalance among series connected thyristors during steady state as well as in transients is one of the major concerns. This voltage imbalance is mitigated by using static and dynamic balancing network. Dynamic balancing networks are typically designed based on reverse recovery charge of the thyristor during turn-off, which suits many applications. But this is not the case for a crowbar application, where turn-off of the thyristor is not a major circuit constraint. This paper proposes the design method for dynamic balancing network considering gate turn-on delay time and the balancing network component tolerances. The paper derives two models for the dynamic balancing network based on its charge-discharge cycle. The importance of charge-discharge cycle in the design of dynamic balancing network during…
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Taxonomy
TopicsHVDC Systems and Fault Protection · Microgrid Control and Optimization · Silicon Carbide Semiconductor Technologies
