This paper presents a full-CMOS Wireless Power Receiving Unit (WPRU) with high efficiency 6.78 MHz Active Rectifier and DC-DC Converter for magnetic resonant A4WP applications. The proposed high efficiency Active Rectifier with Delay Locked Loop (DLL) is a highly efficient receiver circuit intended for use in resonant wireless charging applications with a resonant frequency of 6.78 MHz. Each MOSFET of the proposed rectifier is turned on and off based on the AC input voltage.The delay between the AC input current and the AC input voltage due to the delays of internal blocks such as Voltage Limiter, Level Shifter, Gate Driver, and Comparator, will cause the reverse leakage current degrading the power efficiency. Thus, the proposed Active Rectifier adopts the Delay Locked Loop (DLL) to compensate for the delay caused by internal blocks, which leads to the removal of reverse leakage current and the power efficiency maximization. Moreover, to maximize power efficiency, Negative Impedance Circuit (Temperature (PVT) Variation to solve the efficiency reduction problem, especially by heat.This chip is implemented using 0.18 μm BCD technology with an active area of 3.5 mm x 3.5 mm.When the magnitude of the AC input voltage was 8.95 V, the maximum efficiencies of the proposed Active Rectifier and DC-DC Converter were 91.5 % and 92.7 %, respectively. The range of AC input voltage was 3 V -20 V, the efficiency of the Wireless Power Receiving Unit (WPRU) is about 80.86 %.
This paper presents a highly linear, small-area analog front end with gain and offset compensation for automotive capacitive pressure sensor. We propose a capacitance-tovoltage converter circuit that measures the capacitance value of the capacitive sensor with the high accuracy and linearity. In this paper, the linearity of the analog front end is guaranteed using full-analog gain and an offset calibration circuit. The proposed design is implemented using CMOS 0.35 µm technology with an active area of 1.94 mm × 1.94 mm. The full output range is from 0.5 to 4.5 V. The ratiometricity is within ±0.7% when the supply voltage is changed by ±10%. The power consumption is 25 mW from a 5 V supply. The output accuracy is within ±1% with respect to Process, Voltage, Temperature variations.Index Terms-Automotive capacitive pressure sensor, analog front end, highly linear, gain and offset compensation.
1530-437X
This paper presents a high-efficiency Schottky diode rectifier for the mobile wireless charging receiver. A wide input range multi-mode rectifier is proposed for a magnetic resonant wireless charging system. The configuration is automatically changed based on the input AC voltage to widen the input voltage range. It is fabricated in a 0.35 um BCD process and its area is 1mm×1.5mm. When the magnitude of the input power is 4 W at 128 kHz, the Power Conversion Efficiency of the multi-mode Schottky diode rectifier is 85%, which is improved by 10% compared with that of the full-wave MOSFET rectifier.
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