21 Apr '16, 5pm

via @PowerElecTech https://t.co/qrRaQzvVbE

via @PowerElecTech https://t.co/qrRaQzvVbE

Safety is a concern for wireless charging, especially for the far-field power beaming. Radio frequency (RF) safety is determined by how much exposure can be applied without being harmful to human health. The Federal Communications Commission (FCC) regulates the safety level for human exposure to an RF field. The safety level is defined based on the combination of signal frequency and the energy it carries. Each RF-based technology aims at beaming small energy packets, and then having the receiving end accumulate and convert these packets to a usable energy level. The Specific Absorption Rate (SAR) is used to define these limits. It has been found that at certain frequencies and power levels, the increase of the skin temperature of a person is higher than other frequencies with similar power levels. The SAR defines frequency range and the amount of power that can be used ne...

Full article: http://powerelectronics.com/charger-ics/survival-fittest-...

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