In this paper, a contact-less power charger for robot applications is studied and developed. Contact-less charging can be achieved by a separable transformer design. The transformer primary core is in the charger unit, and the secondary core is in the robots. The transformer air-gap is equal to the distance between these two parts. By theoretical analysis, software simulations, and circuit implementation, the relationship among the transformer's coupling coefficient, the core geometry, and gap are formulated. In addition, a high-efficiency circuit topology for the studied contact-less charger is fulfilled. It is anticipated that the research results of this paper can contribute to the development of the contact-less charging techniques for robot systems.
This paper presents the design methodology, fabrication and characterization of flip-chip bonded MEMS capacitor for tuning high temperature superconductive resonator. Because the main issue of MEMS capacitor integrated with high temperature superconductor (HTS) is high driving voltage due to accumulated thermal stress, a methodology to decrease the thermal stress is discussed. In this work, the thermal stress can be reduced to several MPa, and driving voltage is about 40V. To avoid degradation of HTS thin film during MEMS process, MEMS capacitor is fabricated separately and then flip-chip bonded on the HTS resonator. The tuning effects of this MEMS capacitor applied on HTS resonator of 3GHz resonant frequency are presented.
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