Improved Trigger System for the Suppression of Harmonics and EMI Derived from the Reverse-Recovery Characteristics of a Thyristor

This paper analyses the harmonic pollution to power grids caused by thyristor-controlled devices. It also formulates a mathematic derivation for the voltage spikes in thyristor-controlled branches to explain the harmonic and EMI derived from the reverse-recovery characteristics of the thyristor. With an equivalent nonlinear time-varying voltage source, a detailed simulation model is established, and the periodic dynamic switching characteristic of the thyristor can be explicitly implied. The simulation results are consistent with the probed results from on-site measurements. An improved trigger system with gate-shorted circuit structure is proposed to reduce the voltage spikes that cause EMI. The experimental results indicate that a prototype with the improved trigger system can effectively suppress the voltage spikes.

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Cite this article

[IEEE Style]

T. Wei, Q. Wang, C. Mao, J. Lu, D. Wang, "Improved Trigger System for the Suppression of Harmonics and EMI Derived from the Reverse-Recovery Characteristics of a Thyristor," Journal of Power Electronics, vol. 17, no. 6, pp. 1683-1693, 2017. DOI: 10.6113/JPE.2019.17.6.1683.

[ACM Style]

Tianliu Wei, Qiuyuan Wang, Chengxiong Mao, Jiming Lu, and Dan Wang. 2017. Improved Trigger System for the Suppression of Harmonics and EMI Derived from the Reverse-Recovery Characteristics of a Thyristor. Journal of Power Electronics, 17, 6, (2017), 1683-1693. DOI: 10.6113/JPE.2019.17.6.1683.