—The properties of a single-phase quasi-Z-source inverter (qZSI) and a single-phase quasi-switche... more —The properties of a single-phase quasi-Z-source inverter (qZSI) and a single-phase quasi-switched boost inverter (qSBI), both of which are single-stage buck-boost inverters, are investigated and compared. For the same operating conditions, qSBI has the following advantages over qZSI: 1) three capacitors are saved; 2) the current rating on both of its switches and diodes is lower; 3) its boost factor is higher with an equivalent parasitic effect; and 4) its efficiency is higher. However, qSBI has one more active switch and one more diode than ZS/qZSIs. In addition, the capacitor voltage stress of qSBI is higher than that of qZSI. The DC and AC component circuit analysis, impedance design with low-frequency and high-frequency ripples, component stresses, and power loss calculation are presented. A prototype based on a TMS320F28335 DSP is built in order to compare the operating principle of qSBI and qZSI. Index Terms—Quasi-Z-source inverter, quasi-switched boost inverter, boost inversion ability, shoot-through state.
—The properties of a single-phase quasi-Z-source inverter (qZSI) and a single-phase quasi-switche... more —The properties of a single-phase quasi-Z-source inverter (qZSI) and a single-phase quasi-switched boost inverter (qSBI), both of which are single-stage buck-boost inverters, are investigated and compared. For the same operating conditions, qSBI has the following advantages over qZSI: 1) three capacitors are saved; 2) the current rating on both of its switches and diodes is lower; 3) its boost factor is higher with an equivalent parasitic effect; and 4) its efficiency is higher. However, qSBI has one more active switch and one more diode than ZS/qZSIs. In addition, the capacitor voltage stress of qSBI is higher than that of qZSI. The DC and AC component circuit analysis, impedance design with low-frequency and high-frequency ripples, component stresses, and power loss calculation are presented. A prototype based on a TMS320F28335 DSP is built in order to compare the operating principle of qSBI and qZSI. Index Terms—Quasi-Z-source inverter, quasi-switched boost inverter, boost inversion ability, shoot-through state.
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