US 12,393,820 B2
Smart card
Kyeongdo Kim, Suwon-si (KR); and Minhyeok Kang, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Gyeonggi-Do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jul. 21, 2023, as Appl. No. 18/356,292.
Claims priority of application No. 10-2023-0006954 (KR), filed on Jan. 17, 2023.
Prior Publication US 2024/0242059 A1, Jul. 18, 2024
Int. Cl. G06K 19/06 (2006.01); G05F 1/575 (2006.01); G06K 19/077 (2006.01); H02M 7/06 (2006.01)
CPC G06K 19/07773 (2013.01) [G05F 1/575 (2013.01); H02M 7/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A smart card comprising:
an antenna configured to receive at least one radio signal;
a load circuit that is connected to both ends of the antenna;
a rectifier configured to rectify the at least one radio signal received through the antenna, and provide the rectified signal to an output terminal; and
a power generator including a voltage regulator, a first diode, and a second diode, the voltage regulator configured to provide an internal voltage, the first diode and the second diode connected in series between the output terminal of the rectifier and a first node, and the first node is configured to receive the internal voltage during a first mode of the smart card, the first mode being a mode during which a load of the load circuit is modulated, wherein
the internal voltage is supplied to at least one processor configured to control the smart card,
the load circuit comprises a first resistor, a modulation switch, and a second resistor connected to the both ends of the antenna,
in response to the modulation switch being on, a rectified voltage follows the internal voltage, the rectified voltage being a voltage of the output terminal of the rectifier, and
in response to the modulation switch being off, the rectified voltage follows a voltage obtained based on a threshold voltage of the first diode, a threshold voltage of the second diode, and the internal voltage.