RF–DC converter and DC–DC converter for UHF and microwave wireless power transfer (UWPT/MWPT)
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In this work, we propose a UHF/microwave wireless power transfer (UWPT/MWPT) and communication module (WPT-communication module) for smart spindle. The WPT-communication module can integrate with sensors, such as force/torque, temperature, displacement or vibration sensor, to form a WPT-communication sensor module. The WPT receiver constitutes a UWPT/MWPT receiving antenna, an RF–DC converter and a DC–DC converter. A novel UWPT/MWPT RF–DC converter with power conversion efficiency (PCE) of 86.5–92.2% is demonstrated in the condition of load reistance of 20 Ω and input signal power and frequency of 0.2 W and 0.915–10 GHz, respectively. It can integrate with the 915 MHz UWPT antenna and the DC–DC converter (with the proposed high-speed phase dectector) to form a UWPT receiver, or integrate with the 10 GHz (or 2.4 GHz) MWPT antenna and the DC–DC converter to form a MWPT receiver. A UWPT-communication receiver is designed and implemented. The corresponding PCE is 70%, one of the best results ever reported for UWPT/MWPT receivers.
KeywordsWireless power transfer (WPT) Communication Power conversion efficiency UHF Microwave RF–DC converter DC–DC converter Smart spindle
This work is supported by the Ministry of Science and Technology (MOST) of the R.O.C. under Contracts MOST105-2221-E-260-025-MY3 and MOST106-2221-E-260-025-MY2. The authors are very grateful for the support from Taiwan Semiconductor Research Institute (TSRI) for chip fabrication and high-frequency measurements.
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