frequency_of_wpt
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| WPT must be high frequency in order to achieve high efficiencies. Typically, the range of a few kHz to MHz is used for near-field WPT technologies as inductive and capacitive WPT. For radiative WPT, frequencies higher than GHz are typical. | WPT must be high frequency in order to achieve high efficiencies. Typically, the range of a few kHz to MHz is used for near-field WPT technologies as inductive and capacitive WPT. For radiative WPT, frequencies higher than GHz are typical. | ||
| - | In general, lower frequencies correspond to higher | + | Typically, higher |
| The Qi standard operates in the range 110 to 205 kHz. | The Qi standard operates in the range 110 to 205 kHz. | ||
| The available frequencies in the radio spectrum, ranging from 3 Hz to 3 THz, are limited. Regulations in different countries restrict the free use of certain frequency bands. Moreover, electromagnetic interference can hinder the performance of other devices. As a result, certainly for experimental set-ups, frequencies in the ISM bands are often used. These bands are portions of the radio spectrum reserved internationally for industrial, scientific, and medical (ISM) purposes. With regard to near-field WPT, the bands around 6.78 MHz, 13.56 MHz and sometimes 27.12 MHz are most prevalent. For far-field WPT, the ISM bands around 2.45 GHz and 5.8 GHz are often employed. | The available frequencies in the radio spectrum, ranging from 3 Hz to 3 THz, are limited. Regulations in different countries restrict the free use of certain frequency bands. Moreover, electromagnetic interference can hinder the performance of other devices. As a result, certainly for experimental set-ups, frequencies in the ISM bands are often used. These bands are portions of the radio spectrum reserved internationally for industrial, scientific, and medical (ISM) purposes. With regard to near-field WPT, the bands around 6.78 MHz, 13.56 MHz and sometimes 27.12 MHz are most prevalent. For far-field WPT, the ISM bands around 2.45 GHz and 5.8 GHz are often employed. | ||
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| + | For near-field WPT, that uses inductors and capacitors, the efficiency of the system is related to the quality factor (Q-factor) of the circuit and the components. The higher the frequency, the higher the Q-factor, which means the lower the losses. Indeed, the Q-factor of a coil and a capacitor are linearly dependent on the frequency. | ||
frequency_of_wpt.txt · Last modified: 2025/03/30 06:26 by admin