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A 3-D wireless charging system with spatial freedom of positioning is proposed in this paper. By independently adjusting the phase and the amplitude of the input signals, the blind spots within a cylindrical volume are eliminated. Moreover, the symmetric arrangement of the transmitting coils yields a uniform magnetic field around longitudinal axis. Experiments were conducted on a wearable device and...
A cup-shaped in-vehicle wireless charging system that allows free alignment for charging portable devices is proposed in this paper. A 3D transmitter coil structure is designed to provide the sufficient magnetic flux density perpendicular to each charging surface. By adding the flexible ferrite sheet surrounding the structure, the leakage of magnetic flux is eliminated to meet the electromagnetic...
A resonant wireless power transfer (WPT) system that allows for free positioning of a wearable device about a 360° axis of rotation and simultaneous charging of a mobile phone is proposed. A 3D transmitter coil structure is introduced to provide a cylindrical charging surface with a uniform magnetic field. A prototype charging system including an amplifier and a rectifier operating at 6.78 MHz is...
We demonstrate a compact wireless power receiver for mobile phones that operates either in a resonant mode at 6.78 MHz or an inductive mode in the 110 to 205 kHz range. A coil arrangement and matching network is introduced that is resonant in both frequency bands, allowing the same power conversion circuitry to operate in either mode. The receiver converts up to 5 W of AC power to a regulated 5 V...
High-data-rate wireless technologies such as HSUPA and LTE are power-hungry because of the fundamental correlation between data rate and transmit power. Furthermore, the high peak-to-average power ratio (PAPR) of the modulated signals causes a degradation in PA efficiency, since the supply voltage of the PA must be high enough to provide the peak output voltage without loss of linearity. Envelope...
A low-power continuous-time ΔΣ ADC for HSDPA (High-Speed Downlink Packet Access) applications provides 83 dB dynamic range and 1.92 MHz bandwidth. A high sample rate (245.76 MHz) and an FIR filter in the outer feedback path minimize susceptibility to jitter. A TIA-based integrator with direct connection of inner feedback DAC current sources to integration capacitors supports the high sample rate....
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