US 12,039,387 B2
IC card and IC card system
Takahiro Nagai, Nagaokakyo (JP); and Tatsuya Hosotani, Nagaokakyo (JP)
Assigned to Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto-fu (JP)
Filed on Nov. 29, 2022, as Appl. No. 18/059,774.
Application 18/059,774 is a continuation of application No. PCT/JP2021/004027, filed on Feb. 4, 2021.
Claims priority of application No. 2020-096001 (JP), filed on Jun. 2, 2020.
Prior Publication US 2023/0091589 A1, Mar. 23, 2023
Int. Cl. G06K 19/07 (2006.01); H02J 7/00 (2006.01); H02J 50/12 (2016.01); H02J 50/80 (2016.01); H04B 5/77 (2024.01); H04B 5/79 (2024.01)
CPC G06K 19/0701 (2013.01) [H02J 7/00712 (2020.01); H02J 50/12 (2016.02); H02J 50/80 (2016.02); H04B 5/77 (2024.01); H04B 5/79 (2024.01)] 20 Claims
OG exemplary drawing
 
1. An IC card configured to communicate with a reader/writer, which is induction-type read/write communication equipment, in a contactless manner, the IC card comprising:
a power receiving coil;
a power receiving circuit connected to the power receiving coil;
a communication antenna; a communication circuit connected to the communication antenna;
an electrical energy storage device;
a charging circuit connected between the power receiving circuit and the electrical energy storage device;
an electronic functional circuit connected to the communication circuit;
a voltage conversion circuit connected between the electrical energy storage device and the electronic functional circuit; and
a power supply control circuit configured to control the charging circuit and the voltage conversion circuit,
wherein the power supply control circuit is configured to
detect or power reception in accordance with an output voltage of the power receiving circuit,
detect or predetermined communication by using the electronic functional circuit,
when there is not the predetermined communication immediately after power reception is detected, start to charge the electrical energy storage device by using the charging circuit, and,
when there is the predetermined communication immediately after power reception is detected, supply power from the voltage conversion circuit to the electronic functional circuit without starting to charge the electrical energy storage device by using the charging circuit.