US 11,055,598 B2
Mode-changeable power supply circuit and smart card including the same
Kyeongdo Kim, Seoul (KR); Sanghyo Lee, Incheon (KR); Seungwon Lee, Yongin-si (KR); and Jongpil Cho, Hwaseong-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Dec. 27, 2018, as Appl. No. 16/233,886.
Claims priority of application No. 10-2018-0002883 (KR), filed on Jan. 9, 2018.
Prior Publication US 2019/0213459 A1, Jul. 11, 2019
Int. Cl. G06K 19/077 (2006.01); G06K 19/07 (2006.01); H02M 1/08 (2006.01); H02M 3/156 (2006.01); H02M 1/00 (2006.01); H02M 7/06 (2006.01)
CPC G06K 19/07773 (2013.01) [G06K 19/0715 (2013.01); H02M 1/08 (2013.01); H02M 3/156 (2013.01); H02M 7/06 (2013.01); H02M 2001/0045 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A smart card, comprising:
an antenna to transmit and to receive a radio frequency signal;
a rectifier to rectify a signal received through the antenna to output a rectified voltage;
a voltage regulator to operate in a first operation mode for stabilizing a level of the rectified voltage and a second operation mode for generating an internal voltage using the rectified voltage;
a regulator converter to control the voltage regulator to operate the voltage regulator in one of the first operation mode and the second operation mode according to a mode selection signal;
a clamp circuit to connect an output terminal of the rectifier to a ground according to the mode selection signal;
a load modulator to vary a resistance of the antenna to perform a load modulation; and
a regulator controller to generate the mode selection signal according to whether the load modulator is activated or deactivated,
wherein the regulator controller generates the mode selection signal such that the voltage regulator operates in the second operation mode for generating the internal voltage using the rectified voltage when the load modulator is activated, and wherein the regulator controller connects the output terminal of the rectifier to the ground through the clamp circuit when the load modulator is activated.