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Keywords

HERIC inverter;soft switching;resonance suppression

Abstract

To improve the operational efficiency of the highly efficient and reliable inverter concept （HERIC），auxiliary branches are often introduced to achieve zero voltage switching （ZVS） of the power switches.However，when the auxiliary branches realize soft switching，the parasitic capacitance of the auxiliary switch resonates with the auxiliary inductance，which aggravates the voltage stress on the auxiliary switch and affects the safe operation of the circuit.To address this issue，a clamping technique is proposed to mitigate the additional voltage stress caused by resonance.First，the resonance mechanism of the inverter is analyzed，and the potential difference between the auxiliary branch and the direct current （DC） bus is calculated under non-resonant conditions.Then，based on this potential difference，a transient voltage suppressor （TVS） is selected，and anti-series diodes are used to form a clamping branch.When the TVS is reverse-broken down by a large resonance voltage，the auxiliary branch voltage is clamped by the bus voltage to achieve resonance suppression.Additionally，this branch serves a suppressive role only during the resonance occurrence，without affecting the normal operation of the circuit.Finally，experimental results show that the clamping branch can effectively suppress the resonance voltage，with the peak resonance voltage of the auxiliary branch under full load being reduced by 49.4 % compared to that without the branch.

DOI

10.19781/j.issn.1673-9140.2025.04.022

First Page

247

Last Page

255

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