Coaxial coupled structure of wireless power transfer, applied to high-precision instruments in aerospace, can eliminate interference sources by spatial isolation. For the optimization of the electromagnetic structure, a C-shaped magnetic structure is presented for both shielding electromagnetic simulation and improving coupling. By comparing of spiral and coaxial structures, an analysis is presented and validated in the effect of positional offset on inductive coupling, voltage gain, and efficiency. To obtain a stable and sufficient power supply, the prototype is implemented based on primary series-secondary series compensation topology with a maximum output power of 200 W, and a DC-DC efficiency of 82% is achieved.
This paper presents an integrated Hall switch sensor based on SMIC 0.18 m CMOS technology. The system includes a front-end Hall element and a back-end signal processing circuit. By optimizing the structure of the Hall element and using the orthogonal coupling and spinning current technology, the offset voltage can be suppressed effectively. The simulation results showed that the Hall switch can eliminate offset voltage greater than 1 mV at 3.3 V supply voltage. Two modes of the Hall switch circuit, the awake mode and the sleep mode, were realized by using clock logic signals without compromising the performance of the Hall switch, thereby reducing power consumption. The test results showed that the operate point and the release point of the switch were within the range of 3-7 mT at 3.3 V supply voltage. Meanwhile, the current consumption is 7.89 A.
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