Patent · US Active

NFC system wakeup with energy harvesting

US10680677B2 · kind B2 · utility

7Cited by

1References

8Claims

0Family size

Assignee

NXP B.V. · NL

Inventors

Markus Wobak · Graz, AT
Leonhard Kormann · Gratwein-Straßengel, AT
Juergen Schroeder · Ludwigshafen, DE

Key dates

Filing date	Aug 1, 2016
Grant date	Jun 9, 2020
Priority date	—
Expiry date	Aug 1, 2036

Classification

Technology area (CPC H)Electricity
CPC primaryH04B5/77
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

The present invention provides for a system that makes use of a system power supply enable switch controlled by a near field communications (NFC) frontend with energy harvesting. In one embodiment, RF power in the 13.56 MHz band generated by a NFC counterpart (such as a mobile phone) is detected by the energy harvesting unit being part of the battery-unpowered NFC communication device. After activation, the system can perform actions required to communicate to the presented device (i.e., the NFC counterpart). Later, the system can switch itself into the unpowered state again. In another embodiment, this feature can also be used to control an NFC protection circuitry very quickly after the NFC device is exposed to an external HF (high frequency) field.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.