US 12,015,277 B2
Sensor node with wireless energy harvesting and method for operating the sensor node
Ulrich Andreas Muehlmann, Graz (AT); and Michael Schober, Graz (AT)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Jul. 25, 2022, as Appl. No. 17/814,589.
Prior Publication US 2024/0030743 A1, Jan. 25, 2024
Int. Cl. H02J 50/00 (2016.01); G01R 19/25 (2006.01); H04B 1/40 (2015.01)
CPC H02J 50/001 (2020.01) [G01R 19/2503 (2013.01); H04B 1/40 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A sensor node comprising:
a radio frequency (RF) circuit for wirelessly harvesting energy from an external device to produce a voltage at an output of the RF circuit for charging a capacitive element; and
a sensor interface circuit coupled to the capacitive element and to the output of the RF circuit, the sensor interface circuit having a sensor terminal configured to communicate with a sensor,
wherein in response to a request from the external device, the sensor node provides a voltage level of the capacitive element to the external device, and wherein the external device uses the voltage level to determine an available energy budget of the sensor node.