Patents by Inventor Hye Man Jung
Hye Man Jung 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: 11064587Abstract: An LED lighting apparatus including a rectifier to rectify AC voltages having different magnitudes and generate driving voltages corresponding to rectified voltages, a buck converter connected to an output terminal of the rectifier and generate an LED driving current corresponding to the driving voltages, a variable reference voltage comparator to receive the driving voltages, and generate variable reference voltages that fluctuate in correspondence to magnitudes of the output driving voltages, compare the driving voltages and the variable reference voltages, and output signals for controlling an operation of the buck converter, an LED including at least one LED group and driven by the LED driving current generated by the buck converter, and a controller including a converter controller to control the operation of the buck converter and a constant current controller to constant current-control the LED driving current applied to the at least one LED group.Type: GrantFiled: May 20, 2020Date of Patent: July 13, 2021Assignee: Seoul Semiconductor Co., Ltd.Inventors: Hye Man Jung, Keith Hopwood
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Publication number: 20200375001Abstract: An LED lighting apparatus including a rectifier to rectify AC voltages having different magnitudes and generate driving voltages corresponding to rectified voltages, a buck converter connected to an output terminal of the rectifier and generate an LED driving current corresponding to the driving voltages, a variable reference voltage comparator to receive the driving voltages, and generate variable reference voltages that fluctuate in correspondence to magnitudes of the output driving voltages, compare the driving voltages and the variable reference voltages, and output signals for controlling an operation of the buck converter, an LED including at least one LED group and driven by the LED driving current generated by the buck converter, and a controller including a converter controller to control the operation of the buck converter and a constant current controller to constant current-control the LED driving current applied to the at least one LED group.Type: ApplicationFiled: May 20, 2020Publication date: November 26, 2020Inventors: Hye Man JUNG, Keith HOPWOOD
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Patent number: 10321529Abstract: An alternating current sequential drive type LED lighting device having improved flicker performance and being capable of reducing the light output deviation of the LED lighting device generated during operation intervals by removing nonluminous intervals of the LED lighting device by means of a loop-back compensation unit.Type: GrantFiled: March 30, 2017Date of Patent: June 11, 2019Assignee: Seoul Semiconductor Co., Ltd.Inventors: Young Do Jung, Sung Ho Jin, Sang Wook Han, Hye Man Jung
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Patent number: 10187945Abstract: An alternating current sequential drive type LED lighting device having improved flicker performance and being capable of reducing the light output deviation of the LED lighting device generated during operation intervals by removing nonluminous intervals of the LED lighting device by means of a loop-back compensation unit.Type: GrantFiled: December 1, 2015Date of Patent: January 22, 2019Assignee: Seoul Semiconductor Co., Ltd.Inventors: Young Do Jung, Sung Ho Jin, Sang Wook Han, Hye Man Jung
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Patent number: 10028344Abstract: A lighting apparatus includes a light-emitting diode (LED) array, a rectifying unit configured to rectify an alternating current (AC) voltage and to generate a driving voltage for the LED array, a switch control signal generation unit configured to generate a switching control signal depending on the driving voltage, the switching control signal including connection control signals and a compensation control signal, connection changing units configured to change a connection between the LEDs according to the connection control signals, and a light output compensation unit configured to generate a compensation voltage according to the compensation control signal, and selectively supply the compensation voltage to the LED array.Type: GrantFiled: June 24, 2016Date of Patent: July 17, 2018Assignee: Seoul Semiconductor Co., Ltd.Inventors: Hye Man Jung, Hyun Gu Kang, Oh Seok Kim, Young Eun Yang
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Patent number: 9848470Abstract: According to the present invention, provided is an LED driving circuit comprising: a first rectification module, connected to an alternating current power source, for full-wave rectifying an applied alternating current voltage and for supplying a first rectification voltage which has been full-wave rectified to an LED light emitting module as a first driving voltage; and a second driving voltage supply module, connected to the alternating current power source in parallel with the first rectification module, for full-wave rectifying an applied alternating current voltage to generate a second rectification voltage, for charging energy using the generated second rectification voltage at a charging section, and for supplying a second driving voltage to the LED light emitting module at a compensating section.Type: GrantFiled: March 13, 2014Date of Patent: December 19, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventor: Hye Man Jung
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Publication number: 20170251534Abstract: An alternating current sequential drive type LED lighting device having improved flicker performance and being capable of reducing the light output deviation of the LED lighting device generated during operation intervals by removing nonluminous intervals of the LED lighting device by means of a loop-back compensation unit.Type: ApplicationFiled: March 30, 2017Publication date: August 31, 2017Inventors: Young Do JUNG, Sung Ho JIN, Sang Wook HAN, Hye Man JUNG
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Patent number: 9743479Abstract: A sequential driving type alternating current (AC) LED lighting apparatus including a rectifier connected to an alternating current (AC) power source and outputting a first rectified voltage as a first drive voltage to a light-emitting diode (LED) light-emitting device through full-wave rectification of an AC voltage, and an LED drive controller configured to detect a first drive voltage applied to the LED light emitting device and control sequential driving based on the detected first drive voltage. The LED drive controller is configured to set an LED drive current in each of operation sections, such that a difference between light output of the LED light-emitting device in each of the operation sections does not exceed a predetermined light output deviation.Type: GrantFiled: December 12, 2016Date of Patent: August 22, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventor: Hye-man Jung
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Patent number: 9735877Abstract: An optical communication device including a plurality of groups of light emitting diode (LED) groups that are turn on according to a control of a lighting and communication control module. The lighting and communication control module is configured to receive an AC input voltage, generate a rectified voltage from the AC input voltage, determine a voltage level of the rectified voltage, sequentially drive the plurality of LED groups according to the voltage level of the rectified voltage, and perform optical communication through the plurality of LED groups only when the voltage level of the rectified voltage is greater than or equal to a preset threshold voltage level.Type: GrantFiled: November 21, 2013Date of Patent: August 15, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventor: Hye Man Jung
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Patent number: 9713213Abstract: An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.Type: GrantFiled: October 18, 2016Date of Patent: July 18, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventors: Hye Man Jung, Hyun Gu Kang, Snag Wook Han, Young Do Jung
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Patent number: 9674912Abstract: A light-emitting diode (LED) driving circuit configured to drive LED units includes a rectification circuit unit to receive an alternating current (AC) power voltage and rectify the AC power voltage to output a unidirectional ripple voltage, a pulse-width modulation (PWM) signal generation unit to generate PWM decision signals. The PWM signal generation unit is configured to sequentially drive the LEDs according to the PWM decision signals.Type: GrantFiled: June 25, 2015Date of Patent: June 6, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventors: Young Do Jong, Hyun Gu Kang, Hye Man Jung, Kang Nyung Lee
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Publication number: 20170135171Abstract: An alternating current sequential drive type LED lighting device having improved flicker performance and being capable of reducing the light output deviation of the LED lighting device generated during operation intervals by removing nonluminous intervals of the LED lighting device by means of a loop-back compensation unit.Type: ApplicationFiled: December 1, 2015Publication date: May 11, 2017Inventors: Young Do JUNG, Sung Ho JIN, Sang Wook HAN, Hye Man JUNG
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Publication number: 20170094740Abstract: A sequential driving type alternating current (AC) LED lighting apparatus including a rectifier connected to an alternating current (AC) power source and outputting a first rectified voltage as a first drive voltage to a light-emitting diode (LED) light-emitting device through full-wave rectification of an AC voltage, and an LED drive controller configured to detect a first drive voltage applied to the LED light emitting device and control sequential driving based on the detected first drive voltage. The LED drive controller is configured to set an LED drive current in each of operation sections, such that a difference between light output of the LED light-emitting device in each of the operation sections does not exceed a predetermined light output deviation.Type: ApplicationFiled: December 12, 2016Publication date: March 30, 2017Inventor: Hye-man JUNG
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Patent number: 9591709Abstract: An illumination apparatus of a high efficiency light emitting element and a driving circuit of a light emitting element controlling a series and parallel connection relationship between light emitting groups according to a voltage level of a driving voltage and controlling a sequential driving of the light emitting groups at the same time.Type: GrantFiled: April 20, 2016Date of Patent: March 7, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventor: Hye man Jung
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Patent number: 9585214Abstract: An exemplary embodiment discloses a light-emitting diode (LED) driving circuit including an LED driving module configured to provide a first driving voltage to an LED light emitting module including a first LED group to an n-th LED group, n is an integer which is equal to or larger than 2, and sequentially drive the first LED group to the n-th LED group depending on a voltage level of the first driving voltage and a second driving voltage providing module configured to store some of the first driving voltage and selectively provide a second driving voltage to some of the LED groups other than at least the first LED group to an m-th LED group among the LED groups in a Vfm compensation section, 1?m?n?1, according to a control of the LED driving module.Type: GrantFiled: June 29, 2015Date of Patent: February 28, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventors: Hye Man Jung, Hyun Gu Kang, Sang Wook Han
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Publication number: 20170041991Abstract: An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.Type: ApplicationFiled: October 18, 2016Publication date: February 9, 2017Inventors: Hye Man JUNG, Hyun Gu KANG, Snag Wook HAN, Young Do JUNG
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Patent number: 9538599Abstract: A sequential driving type alternating current (AC) LED lighting apparatus includes a rectification unit connected to an alternating current (AC) power source and outputting a first rectified voltage as a first drive voltage to a light-emitting diode (LED) light-emitting unit through full-wave rectification of an AC voltage, and an LED drive controller configured to detect an LED drive current flowing through the LED light emitting unit or a constant current switch connected to the LED light emitting unit and configured to control sequential driving based on the detected LED drive current. The LED drive controller is configured to set an LED drive current in each of operation sections, such that a difference between light output of the LED light-emitting unit in each of the operation zones does not exceed a predetermined light output deviation.Type: GrantFiled: December 1, 2014Date of Patent: January 3, 2017Assignee: Seoul Semiconductor Co., Ltd.Inventor: Hye-man Jung
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Patent number: 9516718Abstract: An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.Type: GrantFiled: December 28, 2012Date of Patent: December 6, 2016Assignee: Seoul Semiconductor Co., Ltd.Inventors: Hye Man Jung, Hyun Gu Kang, Snag Wook Han, Young Do Jung
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Publication number: 20160309558Abstract: A lighting apparatus includes a light-emitting diode (LED) array, a rectifying unit configured to rectify an alternating current (AC) voltage and to generate a driving voltage for the LED array, a switch control signal generation unit configured to generate a switching control signal depending on the driving voltage, the switching control signal including connection control signals and a compensation control signal, connection changing units configured to change a connection between the LEDs according to the connection control signals, and a light output compensation unit configured to generate a compensation voltage according to the compensation control signal, and selectively supply the compensation voltage to the LED array.Type: ApplicationFiled: June 24, 2016Publication date: October 20, 2016Inventors: Hye Man JUNG, Hyun Gu Kang, Oh Seok Kim, Young Eun Yang
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Publication number: 20160270168Abstract: A light-emitting diode (LED) driving apparatus includes a rectifying module configured to rectify an alternating current voltage and output a first driving voltage, an LED light emitting module including a first LED group, and a second LED group to an n-th LED group, and configured to receive the first driving voltage from the rectifying module, n being a positive integer of two or more, an LED driving module configured to sequentially drive the first LED group to the n-th LED group according to a voltage level of the first driving voltage, and a second driving voltage providing module connected in parallel to at least one LED group of the second LED group to the n-th LED group.Type: ApplicationFiled: May 20, 2016Publication date: September 15, 2016Inventors: Hye Man JUNG, Hyun Gu KANG, Sang Wook HAN