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A miniature magnetic resonance coil for an external memory disk is presented. The proposed resonance coils are derived from a spiral structure and two capacitors through the analysis of input impedance. The measured resonance frequency and efficiency are 1.78 MHz and 82.3% at normalized distance 6 cm and the diameter size of the Rx spiral coil is 7cm.
A simple miniature magnetic resonance coil for wide wireless power transfer applications is presented. The proposed resonance coils are derived from a new two layered spiral structure designed through the analysis of input impedance, transmission coefficient and direction of coil current. The measured resonance frequency and efficiency are 1.8 MHz and 82.5% at normalized distance 0.68(20.4 cm) and...
A wireless power transmission system for 1.78MHz, 60W docent robot using coupled magnetic resonances is presented. The proposed wireless power transmission system consists of a 130W class-F power transmitter, two magnetic resonance couplers and 60W full bridge RF rectifier receiver. The transmitter is composed of DDS (Direct Digital Synthesizer) block, class-F power amplifier and VSWR measurement...
A wireless power transfer system for 1.8 MHz, 20W LED display board is presented. Coupled magnetic resonance method is used for wireless power transfer and the operating frequency is selected by considering guidelines for limiting human exposure to electromagnetic fields. The power consumption of the LED display board is about 20W and the entire efficiency of this WPT system is 50.5%. The strength...
A wireless power transmission system for 1.8MHz, 20W LED display board using coupled magnetic resonances is presented. The proposed wireless power transmission system consists of a 50W class-F power transmitter, two magnetic resonance couplers and 20W full bridge RF rectifier receiver. The transmitter is composed of DDS (Direct Digital Synthesizer) block, class-F power amplifier and VSWR measurement...
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