Patents by Inventor Dongwon Kwon
Dongwon Kwon 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: 11824451Abstract: A multi-phase buck-boost converter circuit comprises a buck circuit stage, a boost circuit stage, and a control circuit. The buck circuit stage is connected to an input of the buck-boost converter circuit to receive an input voltage. The boost circuit stage includes multiple boost circuits connected in parallel. The boost circuit stage is coupled to the buck circuit stage and an output of the multi-phase buck-boost converter circuit. Each boost circuit includes an inductor coupled to the buck circuit stage. The control circuit operates the multiple boost circuit stages out of phase with respect to each other in a boost mode, operates the buck circuit stage in a buck mode, and operates the multiple boost circuit stages out of phase with respect to each other and operates the buck circuit stage in a buck-boost mode.Type: GrantFiled: August 13, 2021Date of Patent: November 21, 2023Assignee: Analog Devices, Inc.Inventors: Dongwon Kwon, Min Kyu Song, Jindong Zhang, Min Chen
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Publication number: 20230047637Abstract: A multi-phase buck-boost converter circuit comprises a buck circuit stage, a boost circuit stage, and a control circuit. The buck circuit stage is connected to an input of the buck-boost converter circuit to receive an input voltage. The boost circuit stage includes multiple boost circuits connected in parallel. The boost circuit stage is coupled to the buck circuit stage and an output of the multi-phase buck-boost converter circuit. Each boost circuit includes an inductor coupled to the buck circuit stage. The control circuit operates the multiple boost circuit stages out of phase with respect to each other in a boost mode, operates the buck circuit stage in a buck mode, and operates the multiple boost circuit stages out of phase with respect to each other and operates the buck circuit stage in a buck-boost mode.Type: ApplicationFiled: August 13, 2021Publication date: February 16, 2023Inventors: Dongwon Kwon, Min Kyu Song, Jindong Zhang, Min Chen
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Patent number: 10291128Abstract: A synchronous converter that includes a power source, an inductor, an output terminal, and a control circuit. The control circuit may include: an electronic energizing switch that, when activated, delivers energy from the power source to the inductor; an electronic de-energizing switch that, when activated, delivers energy from the inductor to the output terminal, the electronic de-energizing switch including a body diode; and an electronic pull-down switch that, when activated, turns off the electronic de-energizing switch, redirects current flowing though the body diode of the electronic de-energizing switch, and removes charge from the body diode of the electronic de-energizing switch. The electronic energizing switch and the electronic de-energizing switch may never both be activated at the same time.Type: GrantFiled: December 19, 2017Date of Patent: May 14, 2019Assignee: Linear Technology Holding LLCInventors: Dongwon Kwon, Joshua William Caldwell
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Patent number: 10136488Abstract: Techniques are provided for low, or deep, dimming of a light-emitting diode (LED) load. In an example, a method of adjusting an initial voltage of a driver circuit for an LED load can include providing current to an LED load from a power stage of the driver during an on-time of a pulse-width modulation (PWM) cycle, receiving error current information of the driver circuit at a low-dimming control circuit of the driver, and adjusting a voltage of an output capacitor coupled to the driver during an off-time of the PWM cycle, the charge adjustment based on the error current information.Type: GrantFiled: October 5, 2017Date of Patent: November 20, 2018Assignee: Linear Technology Holding, LLCInventors: Dongwon Kwon, Joshua William Caldwell
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Patent number: 9642200Abstract: A method and system of driving an LED load. There is a power stage that is configured to deliver a level of current indicated by a control signal to the LED load when a PWM signal is ON and stop delivering the level of current when the PWM signal is OFF. There is a feedback circuit that is configured to generate the operating point signal, which causes the power stage to deliver a level of current indicated by the control signal, when the PWM signal is ON. A store and hold circuit is configured to store an information indicative of a level of the operating point signal just after the PWM signal is turned OFF and cause the operating point signal to be at that level just before the PWM signal is turned ON.Type: GrantFiled: May 5, 2016Date of Patent: May 2, 2017Assignee: Linear Technology CorporationInventors: Joshua William Caldwell, Dongwon Kwon, Lucas Andrew Milner
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Patent number: 9596728Abstract: A method and system of driving an LED load. A driver is configured to deliver a level of current indicated by a control signal to the LED load when a PWM signal is ON and stop delivering the level of current when the PWM signal is OFF. An output capacitance element is coupled across a differential output of the LED driver. A feedback path, having a store circuit, is configured to store an information indicative of a first voltage level across the output capacitance element as a stored feedback reference signal just after the PWM signal is turned OFF. The feedback path causes the voltage across the output capacitance element to be at the first voltage level just before the PWM signal is turned ON.Type: GrantFiled: May 5, 2016Date of Patent: March 14, 2017Assignee: Linear Technology CorporationInventors: Joshua William Caldwell, Dongwon Kwon, Lucas Andrew Milner
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Publication number: 20160353537Abstract: A method and system of driving an LED load. There is a power stage that is configured to deliver a level of current indicated by a control signal to the LED load when a PWM signal is ON and stop delivering the level of current when the PWM signal is OFF. There is a feedback circuit that is configured to generate the operating point signal, which causes the power stage to deliver a level of current indicated by the control signal, when the PWM signal is ON. A store and hold circuit is configured to store an information indicative of a level of the operating point signal just after the PWM signal is turned OFF and cause the operating point signal to be at that level just before the PWM signal is turned ON.Type: ApplicationFiled: May 5, 2016Publication date: December 1, 2016Applicant: LINEAR TECHNOLOGY CORPORATIONInventors: Joshua William Caldwell, Dongwon Kwon, Lucas Andrew Milner
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Publication number: 20160353532Abstract: A method and system of driving an LED load. A driver is configured to deliver a level of current indicated by a control signal to the LED load when a PWM signal is ON and stop delivering the level of current when the PWM signal is OFF. An output capacitance element is coupled across a differential output of the LED driver. A feedback path, having a store circuit, is configured to store an information indicative of a first voltage level across the output capacitance element as a stored feedback reference signal just after the PWM signal is turned OFF. The feedback path causes the voltage across the output capacitance element to be at the first voltage level just before the PWM signal is turned ON.Type: ApplicationFiled: May 5, 2016Publication date: December 1, 2016Applicant: LINEAR TECHNOLOGY CORPORATIONInventors: Joshua William Caldwell, Dongwon Kwon, Lucas Andrew Milner
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Patent number: 8368290Abstract: A circuit for harvesting electrical energy from a piezoelectric source and for storing the electrical energy in a battery includes an inductor that is configured to store electrical energy. A diode bridge-free switching network is configured to: direct electrical energy from the piezoelectric source to the inductor during a first portion of a piezoelectric charge generating cycle; and direct electrical energy from the inductor to the battery during a second portion of the piezoelectric charge generating cycle.Type: GrantFiled: May 18, 2011Date of Patent: February 5, 2013Assignee: Georgia Tech Research CorporationInventors: Dongwon Kwon, Gabriel Alfonso Rincon-Mora
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Publication number: 20110285131Abstract: A circuit for harvesting electrical energy from a piezoelectric source and for storing the electrical energy in a battery includes an inductor that is configured to store electrical energy. A diode bridge-free switching network is configured to: direct electrical energy from the piezoelectric source to the inductor during a first portion of a piezoelectric charge generating cycle; and direct electrical energy from the inductor to the battery during a second portion of the piezoelectric charge generating cycle.Type: ApplicationFiled: May 18, 2011Publication date: November 24, 2011Applicant: GEORGIA TECH RESEARCH CORPORATIONInventors: Dongwon Kwon, Gabriel Alfonso Rincon-Mora