Patents by Inventor Hee-Seok Han

Hee-Seok Han 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).

  • Publication number: 20200119648
    Abstract: A multi-phase switching regulator and a switching regulating method using the multi-phase switching regulator employ an interleaving circuit. The multi-phase switching regulator includes: a first regulating circuit configured to receive an input voltage and generate a first sub-output voltage with a first phase by transforming the input voltage in response to a first set signal; a second regulating circuit configured to receive the input voltage and generate a second sub-output voltage with a second phase by transforming the input voltage in response to a second set signal; and the interleaving circuit configured to repeatedly and sequentially generate the first set signal and the second set signal by comparing a reference voltage with an output voltage generated based on the first sub-output voltage and the second sub-output voltage.
    Type: Application
    Filed: August 14, 2019
    Publication date: April 16, 2020
    Inventors: SUN-KYU LEE, NGUYEN HUYHIEU, DONG-JIN KEUM, JE-HYUNG YOON, HEE-SEOK HAN
  • Patent number: 9445463
    Abstract: Disclosed is an LED lighting device using a ballast for a fluorescent lamp, the LED lighting device including: an LED part which includes at least one LED device; a rectifier which rectifies a power signal outputted from the ballast for a fluorescent lamp; and a controller which receives an output signal of the rectifier and controls power transmitted from the ballast to the LED part.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: September 13, 2016
    Assignee: HiDeep Inc.
    Inventors: Jaeyoung Choi, Hee Seok Han
  • Patent number: 9001098
    Abstract: A power supply system includes a control unit comprising a detecting and converting unit that is operable to generate a detected current based on a difference between a set voltage and a voltage representative of a current flow through an energy storage member.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: April 7, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Myung-Ho Seo, Hee-Seok Han
  • Patent number: 8581830
    Abstract: A light source driver including an adjusting circuit configured to adjust a voltage applied to each of a plurality of light source channels in response to a plurality of comparison signals and a comparison circuit configured to compare a minimum voltage among output voltages of the respective light source channels with a plurality of reference voltages and output the plurality of comparison signals.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: November 12, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hee Seok Han
  • Publication number: 20130278161
    Abstract: Disclosed is an LED lighting device using a ballast for a fluorescent lamp, the LED lighting device including: an LED part which includes at least one LED device; a rectifier which rectifies a power signal outputted from the ballast for a fluorescent lamp; and a controller which receives an output signal of the rectifier and controls power transmitted from the ballast to the LED part.
    Type: Application
    Filed: April 18, 2013
    Publication date: October 24, 2013
    Applicant: HiDeep Inc.
    Inventors: Jaeyoung CHOI, Hee Seok HAN
  • Patent number: 8368312
    Abstract: A light-emitting-diode driving circuit includes a current driving circuit configured to control current signals flowing through light-emitting-diode strings in response to a first signal that includes information of a light-emitting-diode current, a dynamic headroom controller configured to generate a third control signal that changes according to a change of the current signals flowing through the light-emitting-diode strings based on voltage signals of first terminals of each of the light-emitting-diode strings and a second control signal that includes the information of the light-emitting-diode current, and a power supply circuit configured to generate a light-emitting-diode driving voltage that changes in response to the third control signal, and provide the light-emitting-diode driving voltage to second terminals of each of the light-emitting-diode strings.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: February 5, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yong-Hun Kim, Wan-Jung Kim, Hee-Seok Han
  • Patent number: 8232835
    Abstract: An apparatus for generating a voltage required for a semiconductor device by using a voltage supplied from an external power supply is provided.
    Type: Grant
    Filed: January 5, 2010
    Date of Patent: July 31, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hyoung-rae Kim, Hee-seok Han, Yoon-kyung Choi
  • Publication number: 20120127214
    Abstract: A light-emitting-diode (LED) driving circuit and a display device include a current driving circuit, a level detector, a comparing circuit, a digital control circuit, and a power supply circuit. The level detector detects a minimum detection voltage signal having a minimum voltage level among voltage signals of first terminals of respective LED strings. The comparing circuit generates a first comparison output signal and a second comparison output signal based on a headroom-control reference voltage and the minimum detection voltage signal. The digital control circuit adjusts a duty ratio of a gate control signal in a digital mode based on the first comparison output signal, the second comparison output signal and a control clock signal. Therefore, the LED driving circuit has a small area in a semiconductor integrated circuit.
    Type: Application
    Filed: September 23, 2011
    Publication date: May 24, 2012
    Applicant: Samsung Electronics Co., Ltd
    Inventors: Hee-Seok HAN, Jong-Seon Kim
  • Publication number: 20110204817
    Abstract: A light source driver including an adjusting circuit configured to adjust a voltage applied to each of a plurality of light source channels in response to a plurality of comparison signals and a comparison circuit configured to compare a minimum voltage among output voltages of the respective light source channels with a plurality of reference voltages and output the plurality of comparison signals.
    Type: Application
    Filed: February 14, 2011
    Publication date: August 25, 2011
    Inventor: Hee Seok HAN
  • Publication number: 20110121755
    Abstract: Provided is a multi-channel LED driving circuit which includes: an LED array of N LED channels (N is an integer equal to or greater than one), each channel having a plurality of LEDs connected in series, a supply voltage being input to one end of each channel, and the other end of each channel being connected to N current drivers, respectively; a dynamic headroom control block comparing N channel voltages of common nodes of the N LED channels and the N current drivers with combination voltages of a first reference voltage and a hysteresis voltage, and generating a second reference voltage in response to at least one dimming signal that defines a time period during which a predetermined current flows to the N current drivers through the N LED channels; and a direct current to direct current (DC-DC) converter generating the supply voltage corresponding to the second reference voltage.
    Type: Application
    Filed: November 8, 2010
    Publication date: May 26, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Hee-seok HAN
  • Publication number: 20110115770
    Abstract: A power supply system includes a control unit comprising a detecting and converting unit that is operable to generate a detected current based on a difference between a set voltage and a voltage representative of a current flow through an energy storage member.
    Type: Application
    Filed: February 25, 2010
    Publication date: May 19, 2011
    Inventors: Myung-Ho Seo, Hee-Seok Han
  • Publication number: 20110109243
    Abstract: A light-emitting-diode driving circuit includes a current driving circuit configured to control current signals flowing through light-emitting-diode strings in response to a first signal that includes information of a light-emitting-diode current, a dynamic headroom controller configured to generate a third control signal that changes according to a change of the current signals flowing through the light-emitting-diode strings based on voltage signals of first terminals of each of the light-emitting-diode strings and a second control signal that includes the information of the light-emitting-diode current, and a power supply circuit configured to generate a light-emitting-diode driving voltage that changes in response to the third control signal, and provide the light-emitting-diode driving voltage to second terminals of each of the light-emitting-diode strings.
    Type: Application
    Filed: July 21, 2010
    Publication date: May 12, 2011
    Inventors: Yong-Hun KIM, Wan-Jung Kim, Hee-Seok Han
  • Publication number: 20110050110
    Abstract: The light emitting diode (LED) driving apparatus includes a channel driving unit configured to detect a pulse width of a pulse width modulation (PWM) signal, and configured to output n dimming signals, where n is a natural number greater than or equal to 2. The channel driving unit is configured to sequentially shift a phase of the PWM signal by as much as the detected pulse width to generate the n dimming signals, and configured to output the n dimming signals to n channels.
    Type: Application
    Filed: June 14, 2010
    Publication date: March 3, 2011
    Inventor: Hee-seok Han
  • Patent number: 7880501
    Abstract: Level shifting circuits generate multiple tracking signals that are in-phase with an input signal, but are also level-shifted with wider voltage swings relative to the input signal. These input tracking signals are provided as separate inputs to an inverter having at least one PMOS pull-up transistor and at least one NMOS pull-down transistor therein. A level shifting circuit may include a differential input circuit, which is responsive to true and complementary input signals. A first load circuit is electrically coupled to the differential input circuit. This first load circuit is configured to generate first and second tracking signals at respective first and second nodes therein. These first and second tracking signals are in-phase, level-shifted versions of each other, and have respective voltage swings that are greater than a voltage swing of the complementary input signals.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: February 1, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hee-Seok Han, Hyoung-Rae Kim
  • Publication number: 20100171372
    Abstract: An apparatus for generating a voltage required for a semiconductor device by using a voltage supplied from an external power supply is provided.
    Type: Application
    Filed: January 5, 2010
    Publication date: July 8, 2010
    Inventors: Hyoung-rae Kim, Hee-seok Han, Yoon-kyung Choi
  • Publication number: 20100019831
    Abstract: A charge pump includes a first end including a first section having a first capacitor and a first node, and a second end including a second section having a second capacitor. The first section charges the first capacitor with a first voltage during a first logic section of a clock signal, and converts an external voltage to a first middle voltage using the first voltage and a second voltage in a second logic section of the clock signal. The first middle voltage is a node voltage of a first node. The second section is connected to the first node, charges the second capacitor with a third voltage during the first logic section of the clock signal, and converts the external voltage to an internal voltage by using the third voltage and the first middle voltage in the second logic section of the clock signal.
    Type: Application
    Filed: July 16, 2009
    Publication date: January 28, 2010
    Inventor: Hee-seok Han
  • Publication number: 20090315610
    Abstract: Level shifting circuits generate multiple tracking signals that are in-phase with an input signal, but are also level-shifted with wider voltage swings relative to the input signal. These input tracking signals are provided as separate inputs to an inverter having at least one PMOS pull-up transistor and at least one NMOS pull-down transistor therein. A level shifting circuit may include a differential input circuit, which is responsive to true and complementary input signals. A first load circuit is electrically coupled to the differential input circuit. This first load circuit is configured to generate first and second tracking signals at respective first and second nodes therein. These first and second tracking signals are in-phase, level-shifted versions of each other, and have respective voltage swings that are greater than a voltage swing of the complementary input signals.
    Type: Application
    Filed: June 17, 2009
    Publication date: December 24, 2009
    Inventors: Hee-Seok Han, Hyoung-Rae Kim
  • Patent number: 7414373
    Abstract: A discharge lamp driving circuit includes an inverter, a ballast capacitor, a discharge lamp, and a lamp current detecting circuit. The inverter converts a DC voltage into an AC voltage with high frequency to output the AC voltage to an output port based on a pulse width modulation control signal. The lamp current detecting circuit outputs a first voltage signal and a second voltage signal according to a voltage across the ballast capacitor to generate a lamp current sensing voltage that is proportional to a lamp current flowing through the discharge lamp. The pulse width modulation control signal has a width varying with amplitude of the lamp current so that the lamp current may be accurately detected.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: August 19, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Gyu-Hyeong Cho, Sang-Kyung Kim, Hee-Seok Han
  • Patent number: 7388336
    Abstract: A discharge lamp driving circuit includes an inverter, a ballast capacitor, a discharge lamp, and a lamp current detecting circuit. The inverter converts a DC voltage into an AC voltage with high frequency to output the AC voltage to an output port based on a pulse width modulation control signal. The lamp current detecting circuit outputs a first voltage signal and a second voltage signal according to a voltage across the ballast capacitor to generate a lamp current sensing voltage that is proportional to a lamp current flowing through the discharge lamp. The pulse width modulation control signal has a width varying with amplitude of the lamp current so that the lamp current may be accurately detected.
    Type: Grant
    Filed: June 8, 2007
    Date of Patent: June 17, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Gyu-Hyeong Cho, Sang-Kyung Kim, Hee-Seok Han
  • Patent number: 7345527
    Abstract: An ultra wideband filter is provided that filters an input signal using a pair of cross-coupled transistors with a small size and small power consumption. The ultra wideband filter includes a reference current generator unit generating a reference current using a bias signal of a predetermined level, a transconductor unit that is biased by the reference current and converts a predetermined input voltage into a current of a predetermined amount to output the current if the input voltage is applied thereto, and a filter unit that outputs a predetermined output voltage corresponding to the output current of the transconductor unit using a plurality of cross-coupled transistors and capacitors. The filter unit may include cross-coupled nMOS and pMOS transistors, and first and second capacitors respectively connected to respective drain terminals of the nMOS and pMOS transistors. Accordingly, the ultra wideband filter can be designed in a minimum size.
    Type: Grant
    Filed: February 1, 2006
    Date of Patent: March 18, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eun-chul Park, Han-seung Lee, Gyu-hyung Cho, Hee-seok Han