US 12,506,348 B2Granted

Radio frequency transaction with a mobile device having a depleted battery

AssigneeNXP B.V.

InventorsMarkus Wobak, Ulrich Andreas Muehlmann

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Abstract

For a mobile device having a main battery and a backup power source, a method is provided for wirelessly charging the backup power source using a reader when the main battery of the mobile device is fully depleted and unable to provide enough power for an RF transaction. The reader detects the mobile device cannot perform the RF transaction. In response, the reader generates an RF field that provides charge for the backup power source of the mobile device. After charging is complete, the mobile device performs the RF transaction using the charged backup power source. In one embodiment the mobile device is a mobile phone being used as a digital key and the reader is implemented in a smart door handle of an automobile that is unlocked by the RF transaction.

Claims7

Dependent claims

A method comprising:

detecting, by a reader device, a mobile device is within a radio frequency (RF) field generated by the reader device;
detecting, by the reader device, a main battery of the mobile device is depleted;
charging, by the reader device, a backup power source of the mobile device using the generated RF field;
wherein
ending the charging by the reader device;
performing a RF transaction with the mobile device using the charged backup power source to provide power;
wherein:
the detecting further comprises the reader device detecting a user action as an indication to begin the charging of the backup power source;
and
the reader device is implemented in a smart door handle of an automobile and the detecting further comprises the reader device detecting the user touching the smart door handle as an indication to begin the charging of the backup power source.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/347,761Filed 6 Jul 2023
Published: US 2025/0015619 A19 Jan 2025
Granted: 23 Dec 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02J 7/82
Including monitoring or indicating arrangements: control of state of charge [SOC]
H04B 5/79
Specially adapted for specific purposes: for data transfer in combination with power transfer
E05B 81/77
Detection of handle operation; Detection of a user approaching a handle; Electrical switching actions performed by door handles: comprising…
H02J 7/345
Parallel operation in networks using both storage and other DC sources, e.g. providing buffering: using capacitors as storage or buffering devices