Transactions of Nanjing University of Aeronautics & Astronautics
Single-Phase to Three-Phase Inverter with Small DC-Link Capacitor for Motor Drive System
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Abstract:
The electrolytic-capacitor-less (EL-cap-less) technique has been attracting more and more interests in these years. The EL-cap-less single-phase to three-phase inverter (STI) with front-end diode rectifier is applied to home electrical appliances. In EL-cap-less systems, film-type capacitor is used to suppress the high-frequency ripple components instead of smoothing the DC-link voltage. By using the EL-cap-less solution, reliability can be improved, lifetime can be increased and high power factor (PF) also can be realized. The EL-cap-less STI brings the opportunity to simplify system structure and lower cost. Because a certain DC-link capacitance is still required, the real PF is limited. To further improve the PF, the ripple components of current references are made in synchronous with the DC-link voltage. And the capacitance chosen guideline of the film-type capacitor also be presented. A prototype is built to verify its real performance.
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TM46
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