access icon openaccess Circuit for clamping bridge overvoltages in voltage-fed quasi-Z-source converter

Unlike the voltage source converter, the Z-source converter can boost as well as buck the input voltage. However, the presence of physically large components in the impedance network introduces large parasitic inductances into power device commutation paths. This leads to consequent overvoltages at power device turn-off. A simple circuit for addressing this is presented. Practical results are given for a voltage-fed quasi-Z-source inverter with discontinuous input current.

Inspec keywords: power convertors; bridge circuits

Other keywords: impedance network; bridge overvoltage clamping; discontinuous input current; parasitic inductances; voltage-fed quasiZ-source converter; power device commutation paths

Subjects: Power electronics, supply and supervisory circuits

References

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.4164
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