RF-DC converter and DC-DC converter for UHF and microwave wireless power transfer (UWPT/MWPT)

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 omega 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.