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Parallel resonant DC link inverter without inductor current setting threshold
Pages: 23-29
Year: Issue:  10
Journal: Electric Machines and Control

Keyword:  current thresholdparallel resonantinvertersoft-switchingthyristor;
Abstract: A novel parallel resonant DC link soft-switching inverter was proposed to improve the efficiency of inverter. A pair of anti-parallel thyristor in the auxiliary resonant circuit was used to control resonant current so that DC link voltage of the inverter decreased to zero periodically. Zero-voltage operation of all main switching devices in inverter was realized. Auxiliary switches were also operated under zero voltage switching or zero current switching in the commutation process. Inductor current threshold relative to load was not set in the commutation process, which was beneficial to reduce the loss of auxiliary circuit and simplify control strategy. Every operation mode in a switching period was analyzed in theory. The design rule was also given. Furthermore, the mathematical models for auxiliary resonant circuit loss and voltage deviation of voltage dividing capacitors were established. A 5 kW laboratory prototype was built. Experi-mental results demonstrate that working process of the inverter accord with principle analysis. Therefore, the proposed soft-switching inverter can effectively improve efficiency.
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