-Multilayer capacitors with high ripple current and high capacitance were manufactured.The electrical properties of these capacitors were characterized for potential application for DC-link capacitors in hybrid electric vehicle inverters. Internal electrode structures were designed to achieve high capacitance and reliability. A single multilayer capacitor showed 0.46 µF/cm 3 of capacitance, 0.65% of dielectric loss, and 1450 V to 1650 V of dielectric breakdown voltage depending on the design of the internal electrode. The capacitor module designed with several multilayer capacitors gave a total capacitance of 450 µF, which is enough for hybrid electric vehicles. In particular, an equivalent series resistance of 4.5 mΩ or less will result in 60 A rms , thereby reaching the allowed ripple current for hybrid electric vehicles.
-In this study, the microwave dielectric properties of nano spheroidization glass powders added Ba(Zn 1/3 Ta 2/3 )O 3 ceramics prepared by solid state reaction have been investigated. Adding (Ba 0.4 Ca 0.6 )SiO 3 nano spheroidization glass powders could effectively promote the densification even in the case of decreasing the sintering temperature. When the glass frit is 0.3 wt% and sintering is carried out at a temperature of 1500 ℃ for 6 hr, a temperature stable microwave dielectric ceramic could be obtained, which has a dielectric constant (ε r ) of 30.2, a quality factor (Q×f 0 ) of 124,000 GHz and a temperature coefficient of resonance frequency (τ f ) of 2 ppm/℃.
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