Patents by Inventor Jung-Wook Heo

Jung-Wook Heo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10430701
    Abstract: A magnetic secure transmission (MST) system includes a switching circuit, an inductor, and a control circuit. The control circuit is configured to control the switching circuit to adjust a level of current in the inductor. The inductor current may be adjusted by a first amount over a data transmission period such that the inductor emits a magnetic pulse including a first magnitude. The inductor current may be kept constant during a first sub-period of a data non-transmission period and may be changed by a second amount at a constant slope during a second sub-period of the data non-transmission period, such that the inductor emits a magnetic pulse including a second magnitude during the second sub-period of the data non-transmission period. The second amount is less than the first amount. The first magnitude is greater than a threshold value. The second magnitude is less than the threshold value.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: October 1, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Woo Lee, Hyoung-Seok Oh, Sang-Hee Kang, Kwang-Chan Lee, Dae-Woong Cho, Jung-Wook Heo
  • Publication number: 20180301911
    Abstract: The semiconductor device including first and second transistors configured to provide a first voltage to a first node, the first voltage being a voltage provided from a travel adaptor (TA), a third transistor connected in series with the second transistor and configured to provide a ground voltage to the first node, and a fourth transistor configured to receive a second voltage from a first inductor connected to the first node, and provide the second voltage to a second node as a third voltage for charging a battery connected thereto may be provided.
    Type: Application
    Filed: January 11, 2018
    Publication date: October 18, 2018
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Sung Kyu CHO, Hyoung seok OH, Kwang Chan LEE, Dae Woong CHO, Jung Wook HEO
  • Patent number: 9899918
    Abstract: In a DC/DC converter, a driving method thereof, and a power supply using the same, the DC/DC converter includes a plurality of power switches connected as a serial string between an input terminal and a ground terminal, a first capacitor connected to at least two power switches of the serial string in parallel, an inductor connected between an intermediate node of the serial string and an output terminal, a second capacitor connected between the output terminal and the ground terminal, and a plurality of drivers configured to generate a switching control signal for each of the plurality of power switches. A voltage having no correlation with a voltage of the input terminal is supplied to a power terminal of each of the plurality of drivers.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: February 20, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Kwang-chan Lee, Sung-woo Lee, Sang-hee Kang, Jung-wook Heo
  • Publication number: 20180032850
    Abstract: A magnetic secure transmission (MST) system includes a switching circuit, an inductor, and a control circuit. The control circuit is configured to control the switching circuit to adjust a level of current in the inductor. The inductor current may be adjusted by a first amount over a data transmission period such that the inductor emits a magnetic pulse including a first magnitude. The inductor current may be kept constant during a first sub-period of a data non-transmission period and may be changed by a second amount at a constant slope during a second sub-period of the data non-transmission period, such that the inductor emits a magnetic pulse including a second magnitude during the second sub-period of the data non-transmission period. The second amount is less than the first amount. The first magnitude is greater than a threshold value. The second magnitude is less than the threshold value.
    Type: Application
    Filed: February 7, 2017
    Publication date: February 1, 2018
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Sung-Woo LEE, Hyoung-Seok OH, Sang-Hee KANG, Kwang-Chan LEE, Dae-Woong CHO, Jung-Wook HEO
  • Publication number: 20160315539
    Abstract: In a DC/DC converter, a driving method thereof, and a power supply using the same, the DC/DC converter includes a plurality of power switches connected as a serial string between an input terminal and a ground terminal, a first capacitor connected to at least two power switches of the serial string in parallel, an inductor connected between an intermediate node of the serial string and an output terminal, a second capacitor connected between the output terminal and the ground terminal, and a plurality of drivers configured to generate a switching control signal for each of the plurality of power switches. A voltage having no correlation with a voltage of the input terminal is supplied to a power terminal of each of the plurality of drivers.
    Type: Application
    Filed: January 22, 2016
    Publication date: October 27, 2016
    Inventors: Kwang-chan Lee, Sung-woo Lee, Sang-hee Kang, Jung-wook Heo
  • Patent number: 7860468
    Abstract: A programmable variable gain amplifier includes at least three amplifiers. A first amplifier is configured to amplify an input signal. A second amplifier, which includes a programmable output load stage, is configured to receive an output signal from the first amplifier and to output a first differential output signal. The output load stage includes multiple first switches and multiple first diode-connected transistors that are open-circuited or short-circuited by the first switches. A third amplifier, which includes a programmable current mirror input stage, is configured to receive the first differential output signal from the second amplifier through the current mirror input stage and to output a second differential output signal. The current mirror input stage includes multiple second switches and multiple second transistors that are open-circuited or short-circuited by the plurality of second switches.
    Type: Grant
    Filed: November 1, 2007
    Date of Patent: December 28, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Il-Ku Nam, Byeong-Ha Park, Jong-Dae Bae, Jung-Wook Heo, Ho-Jung Ju, Hyun-Won Mun, Jeong-Hyun Choi
  • Publication number: 20080119154
    Abstract: A programmable variable gain amplifier includes at least three amplifiers. A first amplifier is configured to amplify an input signal. A second amplifier, which includes a programmable output load stage, is configured to receive an output signal from the first amplifier and to output a first differential output signal. The output load stage includes multiple first switches and multiple first diode-connected transistors that are open-circuited or short-circuited by the first switches. A third amplifier, which includes a programmable current mirror input stage, is configured to receive the first differential output signal from the second amplifier through the current mirror input stage and to output a second differential output signal. The current mirror input stage includes multiple second switches and multiple second transistors that are open-circuited or short-circuited by the plurality of second switches.
    Type: Application
    Filed: November 1, 2007
    Publication date: May 22, 2008
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Il-Ku NAM, Byeong-Ha PARK, Jong-Dae BAE, Jung-Wook HEO, Ho-Jung JU, Hyun-Won MUN, Jeong-Hyun CHOI