Digest of "Implementation Possibilities of SMD Capacitors for High Power Applications"

Janis Zakis, Dmitri Vinnikov

Abstract


Focus is on implementation possibilities of surfacemount device (SMD) to be used in high power applications. SMD capacitors reduce the size and dimensions of a power circuit and increase the flexibility of placement of other components. Ceramic and electrolytic capacitors are compared by means of voltage ripple, volume, labour-intensity and impedance. A 1 kW experimental setup of a quasi-Z-Source inverter (qZSI) based converter was built to compare SMD capacitor performance in the quasi-Z-source (qZS) network. Operation waveforms in both input voltage extremes showed that no significant visual differences exist in the performance of the two types of capacitors.  Differences in voltage ripple were found in the electrolytic and ceramic capacitor case. This fact could be caused by high temperature on the electrolytic capacitors when the voltage ripple damping capability decreases. The heat reduction could be achieved by selecting capacitors with smaller impedance and higher permissible ripple current. If labour intensity and price are not essential, then SMD ceramic capacitors can be recommended for high power applications. Electrolytic capacitors could be implemented only in the case of paralleling them in order to reduce total impedance.

Keywords:

Power conditioning; switched-mode power supply; power capacitors; surface-mount technology

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Developed by Institute of Industrial Electronics and Electrical Engineering of RIGA TECHNICAL UNIVERSITY