Ultra-low power sensor platform with wireless charging system

Abstract

In this paper, we propose a power autonomous sensor platform with ultra-low power radio frequency (RF) transceiver and wireless charging. The ultra-low power RF transceiver consists of super-regenerative receiver and directmodulation transmitter with multi-cell power amplifier. Although the proposed transmitter and receiver only consume 1.79 and 0.683 mW, respectively, the wearable sensor platform requires more power efficient transmitter, due to the limited capacity of rechargeable thin film battery, e.g, 50 ∼ 250 mWhr [1]. Therefore, we apply wireless charging in order to prolong the lifetime and investigate the impact of wireless power transfer on the power autonomy of sensor platform.

Wireless Charging Technologies: Fundamentals, Standards, and Network Applications

“…WRSNs with low duty cycles can maintain a perpetual operation with typically RF power densities in the 20-200µW/cm 2 range [142]. For example, in [143], the authors devised an ultra-low power sensor platform with far-field charging. The implemented sensor transmitter and receiver consume the power of 1.79mW and 0.683mW, respectively, to achieve the data rate of 500kbps.…”

Monitoring Technologies for HVDC Transmission Lines

“…A transmit antenna, a receive antenna, an impedance matching circuit, a voltage multiplier, and a DC capacitor comprise an RF radiation power charging system. The conversion efficiency at the RF receiver is highly dependent on the RF signal density as well as the impedance matching of the voltage booster and the antenna [114,115]. This power transfer method is suitable for charging low-power monitoring sensors in a WSN or RFID system as the transmission efficiency is very low and it is not a feasible approach for high-power-sensing activities due to the potential impacts on human health [116].…”