Patents by Inventor Beom-Seon Ryu
Beom-Seon Ryu 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).
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Patent number: 10243558Abstract: There is provided a CMOS inverter circuit device. The CMOS inverter circuit device includes a delay circuit unit configured to generate different charge and discharge paths of each gate node of a PMOS transistor and an NMOS transistor respectively at the time that an input signal transitions between high and low levels. Therefore, the present examples minimize or erase generation of a short circuit current made at the time that the input signal transition. The examples may simplify circuit architecture, and may make a magnitude of a CMOS inverter circuit device smaller.Type: GrantFiled: January 4, 2017Date of Patent: March 26, 2019Assignee: MagnaChip Semiconductor, Ltd.Inventors: Beom Seon Ryu, Gyu Ho Lim, Tae Kyoung Kang
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Patent number: 9888552Abstract: A detection circuit configured to detect a short in a plurality of LED arrays is provided. The detection circuit includes a voltage measuring unit, a short detecting unit, and a detection control unit. The voltage measuring unit is configured to measure respective feedback voltages of the plurality of LED arrays and output a lowest measured feedback voltage as a first feedback voltage. The short detecting unit is configured to detect the short in the LED arrays using the measured feedback voltages. The detection control unit is configured to control the short detecting unit to stop short detection operation, when the first feedback voltage exceeds a first preset reference voltage.Type: GrantFiled: December 4, 2012Date of Patent: February 6, 2018Assignee: Magnachip Semiconductor, Ltd.Inventors: Tae-kyoung Kang, Gyu-ho Lim, Beom-seon Ryu, Jun-sik Min
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Patent number: 9659667Abstract: A circuit for reading a one time programmable (OTP) memory includes a controller that receives a read input signal and generates a read delay signal, a read voltage signal, and a read latch signal; a read voltage generator that generates a read voltage based on the read voltage signal and outputs the read voltage to a detecting node; an OTP memory unit cell including a first electrode connected to the detecting node; a first detecting unit that determines a voltage at the detecting node; a determining unit that delays an output signal from the first detecting unit based on the read delay signal; and a latch unit that latches an output signal from the determining unit during a first delay time at a falling edge of the read input signal based on the read latch signal.Type: GrantFiled: April 15, 2016Date of Patent: May 23, 2017Assignee: MagnaChip Semiconductor, Ltd.Inventor: Beom Seon Ryu
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Publication number: 20170117894Abstract: There is provided a CMOS inverter circuit device. The CMOS inverter circuit device includes a delay circuit unit configured to generate different charge and discharge paths of each gate node of a PMOS transistor and an NMOS transistor respectively at the time that an input signal transitions between high and low levels. Therefore, the present examples minimize or erase generation of a short circuit current made at the time that the input signal transition. The examples may simplify circuit architecture, and may make a magnitude of a CMOS inverter circuit device smaller.Type: ApplicationFiled: January 4, 2017Publication date: April 27, 2017Applicant: MagnaChip Semiconductor, Ltd.Inventors: Beom Seon RYU, Gyu Ho LIM, Tae Kyoung KANG
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Patent number: 9635746Abstract: A detecting circuit and method thereof are configured to detect whether an LED array is open is described. The detecting circuit includes a resistance unit, a first switching unit, and an output unit. The resistance unit is operatively connected in series to the LED array. The switching unit is configured to be turned on when a voltage of the resistance unit is greater than or equal to a predetermined voltage level. The output unit is configured to produce an output indicative of whether the LED array is open, based whether the first switching unit is turned on.Type: GrantFiled: December 4, 2012Date of Patent: April 25, 2017Assignee: Magnachip Semiconductor, Ltd.Inventors: Jun-sik Min, Tae-kyoung Kang, Beom-seon Ryu
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Patent number: 9596723Abstract: An LED driving circuit is provided. The LED driving circuit includes an input unit which receives an input dimming signal for driving an LED array, a PWM signal generating unit which extends an on-period of the input dimming signal to form an extended dimming signal, and generates a PWM signal using the extended dimming signal, a DC-DC converter which supplies output voltage to the LED array using the PWM signal, and an LED driving unit which drives the LED array using the input dimming signal.Type: GrantFiled: October 31, 2011Date of Patent: March 14, 2017Assignee: Magnachip Semiconductor, Ltd.Inventors: Beom-seon Ryu, Chang-sik Lim
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Patent number: 9521719Abstract: A circuit for driving a lighting apparatus is provided. The circuit includes a valley signal generator configured to generate a valley signal based on an input voltage, an input voltage determining unit configured to determine whether the input voltage corresponds to a direct voltage or a full-wave rectified AC voltage based on the valley signal, an AC voltage simulation unit configured to generate a virtual valley signal when the input voltage is a DC voltage, and a switching device controller configured to control a switching device used to drive an LED module based the determination and at least one of the valley signal and virtual valley signal.Type: GrantFiled: July 30, 2015Date of Patent: December 13, 2016Assignee: MagnaChip Semiconductor, Ltd.Inventors: Gyu Ho Lim, Tae Il Yun, Beom Seon Ryu
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Publication number: 20160329107Abstract: A circuit for reading a one time programmable (OTP) memory includes a controller that receives a read input signal and generates a read delay signal, a read voltage signal, and a read latch signal; a read voltage generator that generates a read voltage based on the read voltage signal and outputs the read voltage to a detecting node; an OTP memory unit cell including a first electrode connected to the detecting node; a first detecting unit that determines a voltage at the detecting node; a determining unit that delays an output signal from the first detecting unit based on the read delay signal; and a latch unit that latches an output signal from the determining unit during a first delay time at a falling edge of the read input signal based on the read latch signal.Type: ApplicationFiled: April 15, 2016Publication date: November 10, 2016Inventor: Beom Seon RYU
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Publication number: 20160081158Abstract: A circuit for driving a lighting apparatus is provided. The circuit includes a valley signal generator configured to generate a valley signal based on an input voltage, an input voltage determining unit configured to determine whether the input voltage corresponds to a direct voltage or a full-wave rectified AC voltage based on the valley signal, an AC voltage simulation unit configured to generate a virtual valley signal when the input voltage is a DC voltage, and a switching device controller configured to control a switching device used to drive an LED module based the determination and at least one of the valley signal and virtual valley signal.Type: ApplicationFiled: July 30, 2015Publication date: March 17, 2016Inventors: Gyu Ho LIM, Tae Il YUN, Beom Seon RYU
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Patent number: 9173260Abstract: A PWM signal generating circuit and method, and an LED driver circuit using same, is disclosed. The PWM signal generating circuit generates a PWM signal for a DC-DC converter using a dimming signal, and includes an oscillator which generates a first clock signal having a predetermined frequency, a synchronizing unit which synchronizes the dimming signal to the first clock signal, and a PWM signal generating unit which generates the PWM signal in response to the first clock signal having a falling edge while the synchronized dimming signal is on.Type: GrantFiled: October 31, 2011Date of Patent: October 27, 2015Assignee: MAGNACHIP SEMICONDUCTOR, LTD.Inventors: Beom-seon Ryu, Chang-sik Lim
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Publication number: 20150109047Abstract: There is provided a CMOS inverter circuit device. The CMOS inverter circuit device includes a delay circuit unit configured to generate different charge and discharge paths of each gate node of a PMOS transistor and an NMOS transistor respectively at the time that an input signal transitions between high and low levels. Therefore, the present examples minimize or erase generation of a short circuit current made at the time that the input signal transition. The examples may simplify circuit architecture, and may make a magnitude of a CMOS inverter circuit device smaller.Type: ApplicationFiled: August 13, 2014Publication date: April 23, 2015Applicant: MagnaChip Semiconductor, Ltd.Inventors: Beom Seon RYU, Gyu Ho LIM, Tae Kyoung KANG
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Patent number: 8941327Abstract: A Light Emitting Diode (LED) driver circuit and a Pulse Width Modulation (PWM) controlling circuit thereof is provided. The LED driver circuit includes a voltage detector connected to a plurality of LED arrays, the voltage detector being configured to determine a connection status of each of the LED arrays according to a level of a feedback voltage of each of the LED arrays, and detect a minimum feedback voltage from the feedback voltage of each of the LED arrays that are determined to be connected, a controller configured to output a control signal to control boosting of the LED arrays according to the detected minimum feedback voltage, a PWM signal generator configured to output a PWM signal corresponding to the outputted control signal, and a driving voltage generator configured to supply a driving voltage commonly to the LED arrays according to the PWM signal.Type: GrantFiled: February 16, 2012Date of Patent: January 27, 2015Assignee: MagnaChip Semiconductor, Ltd.Inventors: Beom-seon Ryu, Chang-sik Lim, Tae-kyoung Kang
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Patent number: 8860320Abstract: A Light Emitting Diode (LED) driver apparatus is provided. The LED driver apparatus includes: a Pulse Width Modulation (PWM) signal generator configured to generate a PWM signal, a DC-DC converter configured to provide a driving voltage of a plurality of LED arrays by using the generated PWM signal, and a sensor configured to determine whether at least one LED array among the plurality of LED arrays is in an open state in response to the driving voltage being higher than or equal to a preset first reference voltage, and the preset first reference voltage is higher than the driving voltage applied when the plurality of LED arrays are each in a working state.Type: GrantFiled: August 15, 2012Date of Patent: October 14, 2014Assignee: Magnachip Semiconductor, Ltd.Inventors: Tae-kyoung Kang, Chang-sik Lim, Eun-ah Ko, Beom-seon Ryu
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Patent number: 8643289Abstract: A Pulse Width Modulation (PWM) controlling circuit and a Light Emitting Diode (LED) driver circuit having the same are provided. An LED driver circuit includes a voltage detector connected to a plurality of LED arrays, the voltage detector being configured to determine a connection status of each of the LED arrays according to a corresponding level of the feedback voltage, and detect a minimum feedback voltage from feedback voltages of the LED arrays that are determined to be connected, a controller configured to output a control signal to one of abort and control boosting of the LED arrays according to the detected minimum feedback voltage, and a Pulse Width Modulation (PWM) signal generator configured to output a PWM signal corresponding to the outputted control signal according to an on/off state of a dimming signal that drives the LED arrays that are determined to be connected.Type: GrantFiled: February 16, 2012Date of Patent: February 4, 2014Assignee: Magnachip Semiconductor, Ltd.Inventors: Beom-seon Ryu, Chang-sik Lim, Jin-wook Kim
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Patent number: 8497726Abstract: A level shifter is provided. The level shifter includes a signal converter connected to an external power source and a ground, first and second output terminals connected to the signal converter, the first and second output terminals being configured to output a bias voltage applied from the external power source, and a switching unit configured to switch a connection state of the signal converter according to an input signal to adjust output voltage values of the first and second output terminals, the switching unit including first and second transistors, the first transistor being of a type that is different from a type of the second transistor, the first and second transistors being connected to each other in series between an input terminal, to which an input signal is applied, and the external power source, gates of the first and second transistors being commonly connected to the second output terminal.Type: GrantFiled: February 16, 2012Date of Patent: July 30, 2013Assignee: MagnaChip Semiconductor, Ltd.Inventors: Beom-seon Ryu, Gyu-ho Lim
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Publication number: 20130147361Abstract: A detection circuit configured to detect a short in a plurality of LED arrays is provided. The detection circuit includes a voltage measuring unit, a short detecting unit, and a detection control unit. The voltage measuring unit is configured to measure respective feedback voltages of the plurality of LED arrays and output a lowest measured feedback voltage as a first feedback voltage. The short detecting unit is configured to detect the short in the LED arrays using the measured feedback voltages. The detection control unit is configured to control the short detecting unit to stop short detection operation, when the first feedback voltage exceeds a first preset reference voltage.Type: ApplicationFiled: December 4, 2012Publication date: June 13, 2013Inventors: Tae-kyoung KANG, Gyu-ho LIM, Beom-seon RYU, Jun-sik MIN
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Publication number: 20130147355Abstract: A detecting circuit and method thereof are configured to detect whether an LED array is open is described. The detecting circuit includes a resistance unit, a first switching unit, and an output unit. The resistance unit is operatively connected in series to the LED array. The switching unit is configured to be turned on when a voltage of the resistance unit is greater than or equal to a predetermined voltage level. The output unit is configured to produce an output indicative of whether the LED array is open, based whether the first switching unit is turned on.Type: ApplicationFiled: December 4, 2012Publication date: June 13, 2013Inventors: Jun-sik Min, Tae-kyoung Kang, Beom-seon Ryu
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Publication number: 20130049614Abstract: A Light Emitting Diode (LED) driver apparatus is provided. The LED driver apparatus includes: a Pulse Width Modulation (PWM) signal generator configured to generate a PWM signal, a DC-DC converter configured to provide a driving voltage of a plurality of LED arrays by using the generated PWM signal, and a sensor configured to determine whether at least one LED array among the plurality of LED arrays is in an open state in response to the driving voltage being higher than or equal to a preset first reference voltage, and the preset first reference voltage is higher than the driving voltage applied when the plurality of LED arrays are each in a working state.Type: ApplicationFiled: August 15, 2012Publication date: February 28, 2013Applicant: MAGNACHIP SEMICONDUCTOR, LTD.Inventors: Tae-kyoung Kang, Chang-sik Lim, Eun-ah Ko, Beom-seon Ryu
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Publication number: 20120212141Abstract: A Light Emitting Diode (LED) driver circuit and a Pulse Width Modulation (PWM) controlling circuit thereof is provided. The LED driver circuit includes a voltage detector connected to a plurality of LED arrays, the voltage detector being configured to determine a connection status of each of the LED arrays according to a level of a feedback voltage of each of the LED arrays, and detect a minimum feedback voltage from the feedback voltage of each of the LED arrays that are determined to be connected, a controller configured to output a control signal to control boosting of the LED arrays according to the detected minimum feedback voltage, a PWM signal generator configured to output a PWM signal corresponding to the outputted control signal, and a driving voltage generator configured to supply a driving voltage commonly to the LED arrays according to the PWM signal.Type: ApplicationFiled: February 16, 2012Publication date: August 23, 2012Applicant: MAGNACHIP SEMICONDUCTOR, LTD.Inventors: Beom-seon Ryu, Chang-sik Lim, Tae-kyoung Kang
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Publication number: 20120212281Abstract: A level shifter is provided. The level shifter includes a signal converter connected to an external power source and a ground, first and second output terminals connected to the signal converter, the first and second output terminals being configured to output a bias voltage applied from the external power source, and a switching unit configured to switch a connection state of the signal converter according to an input signal to adjust output voltage values of the first and second output terminals, the switching unit including first and second transistors, the first transistor being of a type that is different from a type of the second transistor, the first and second transistors being connected to each other in series between an input terminal, to which an input signal is applied, and the external power source, gates of the first and second transistors being commonly connected to the second output terminal.Type: ApplicationFiled: February 16, 2012Publication date: August 23, 2012Applicant: MAGNACHIP SEMICONDUCTOR, LTD.Inventors: Beom-seon Ryu, Gyu-ho Lim