US 11,307,635 B2Granted

Field-powered biometric device, and method of controlling a field-powered biometric device

AssigneeFingerprint Cards Anacatum IP AB

InventorsPeter Almers, David Carling, Rolf Sundblad, Nicholas Weiner, Benjamin Willcocks

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Abstract

A method of controlling operation of a field-powered biometric device comprising biometric acquisition circuitry, processing circuitry controllable to transition between a first functional state having a first power consumption and a second functional state having a second power consumption lower than the first power consumption, and power management circuitry. The method comprises the steps of monitoring, by the power management circuitry, a property indicative of a supply voltage to the processing circuitry; controlling, when the monitored property indicates that the supply voltage has fallen to a first threshold voltage, the processing circuitry to transition from the first functional state to the second functional state; and controlling, when the monitored property indicates that the supply voltage has increased to a second threshold voltage higher than the first threshold voltage, the processing circuitry to transition from the second functional state to the first functional state.

Claims13

Dependent claims

A field-powered biometric device using electrical power harvested from a time-varying electrical field for acquiring and performing operations on a biometric representation of a user, said field-powered biometric device comprising:

biometric acquisition circuitry for acquiring the biometric representation of the user;
processing circuitry connected to said biometric acquisition circuitry for receiving the biometric representation from said biometric acquisition circuitry and performing said operations on the biometric representation, said processing circuitry being controllable to transition between a first functional state exhibiting a first power consumption and a second functional state exhibiting a second power consumption lower than said first power consumption;
power management circuitry connected to said processing circuitry, said power management circuitry being configured to:
monitor a property indicative of a supply voltage to said processing circuitry;
control, when said monitored property indicates that said supply voltage has fallen to a first threshold voltage, said processing circuitry to transition from said first functional state to said second functional state;
and
control, when said monitored property indicates that said supply voltage has changed from said first threshold voltage to a second threshold voltage higher than said first threshold voltage, said processing circuitry to transition back from said second functional state to said first functional state, wherein:
said processing circuitry is controllable to a third functional state in which said processing circuitry saves settings to prepare for shut-down to be able to resume operation when the supply voltage is later improved, and said processing circuitry erases cryptographic and/or biometric data stored by the field-powered biometric device in the third functional state;
and
said power management circuitry is further configured to:
control, when said monitored property indicates that said supply voltage falls below a third threshold voltage lower than said first threshold voltage, said processing circuitry to transition from said second functional state to said third functional state.

8 more elements

monitoring, by said power management circuitry, a property indicative of a supply voltage to said processing circuitry;
controlling, when said monitored property indicates that said supply voltage has fallen to a first threshold voltage, said processing circuitry to transition from said first functional state to said second functional state;
and
controlling, when said monitored property indicates that said supply voltage has increased to a second threshold voltage higher than said first threshold voltage, said processing circuitry to transition from said second functional state to said first functional state, wherein:
said processing circuitry is controllable to a third functional state in which said processing circuitry saves settings to prepare for shut-down to be able to resume operation when the supply voltage is later improved, and said processing circuitry erases cryptographic and/or biometric data stored by the field-powered biometric device in the third functional state;
and
said method further comprises the step of:
controlling, when said monitored property indicates that said supply voltage falls below a third threshold voltage lower than said first threshold voltage, said processing circuitry to transition from said second functional state to said third functional state.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/609,573Filed 24 Apr 2018
Priority: SE 1750548-85 May 2017
Published: US 2020/0064901 A127 Feb 2020
Granted: 19 Apr 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

G06K 19/0723
With integrated circuit chips: the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on…
G06F 1/10
Generating or distributing clock signals or signals derived directly therefrom: distribution of clock signals , e.g. skew
G06F 1/263
Power supply means, e.g. regulation thereof: arrangements for using multiple switchable power supplies, e.g. battery and AC
G06F 1/3206
Power management, i.e. event-based initiation of a power-saving mode: monitoring of events, devices or parameters that trigger a change in power…

Family

US 2020/0064901 A1Pre-grant publication · published 27 Feb 2020
US 11,307,635 B2This patent

From the US filing history. Foreign family members aren’t listed.

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