Patents by Inventor Hyeong-Seok BAEK
Hyeong-Seok BAEK 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: 10608543Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: GrantFiled: June 8, 2018Date of Patent: March 31, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi, Moon-Ho Choi
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Patent number: 10199819Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.Type: GrantFiled: October 11, 2017Date of Patent: February 5, 2019Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Won-Tae Lee, Ji-Hoon Jang, Hyeong Seok Baek, Hang-Seok Choi
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Publication number: 20180294736Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: ApplicationFiled: June 8, 2018Publication date: October 11, 2018Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI, Moon-Ho CHOI
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Patent number: 10014789Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: GrantFiled: July 10, 2017Date of Patent: July 3, 2018Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi, Moon-Ho Choi
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Publication number: 20180034261Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.Type: ApplicationFiled: October 11, 2017Publication date: February 1, 2018Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Won-Tae LEE, Ji-Hoon JANG, Hyeong Seok BAEK, Hang-Seok CHOI
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Patent number: 9825453Abstract: A protection mode control circuit includes an auto-restart counter configured to count the cycle of a first signal in a protection condition and to generate an auto-restart signal when a result of the count reaches a protection reference value and a latch mode unit configured to generate a latch mode signal for changing protection mode to latch mode when the auto-restart signal is consecutively generated by a predetermined threshold number.Type: GrantFiled: December 10, 2015Date of Patent: November 21, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Won-Tae Lee, Ji-Hoon Jang, Hyeong Seok Baek, Hang-Seok Choi
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Patent number: 9812856Abstract: A modulation mode control circuit includes a modulation mode controller configured to select modulation mode based on the result of a comparison between a control voltage and a predetermined PWM threshold voltage and to generate a PWM reference voltage using the PWM threshold voltage and the control voltage and a control signal generation unit configured to generate a first control signal based on the result of a comparison between an oscillation control signal for controlling a switching frequency and the control voltage and the result of a comparison between the oscillation control signal and the PWM threshold voltage and to generate a second control signal based on the result of a comparison between the oscillation control signal and the PWM reference voltage.Type: GrantFiled: December 10, 2015Date of Patent: November 7, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Won-Tae Lee, Ji-Hoon Jang, Hyeong Seok Baek
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Patent number: 9812855Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.Type: GrantFiled: December 10, 2015Date of Patent: November 7, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Won-Tae Lee, Ji-Hoon Jang, Hyeong Seok Baek, Hang-Seok Choi
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Publication number: 20170310231Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: ApplicationFiled: July 10, 2017Publication date: October 26, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI, Moon-Ho CHOI
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Patent number: 9729072Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: GrantFiled: February 11, 2015Date of Patent: August 8, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi, Moon-Ho Choi
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Patent number: 9647528Abstract: A resonant converter includes a first switch coupled between a first node and a primary side ground, a second switch coupled between an input voltage and the first node, at least one capacitor and at least one inductor coupled in series between both ends of the first switch, and a switch control circuit that shifts switching frequencies of the first and second switches during a period for which an abnormal event lasts when occurrence of the abnormal event is detected, and shifts the switching frequencies in an opposite direction when the abnormal event ends.Type: GrantFiled: February 11, 2015Date of Patent: May 9, 2017Assignee: Fairchild Korea Semiconductor LTDInventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi
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Patent number: 9627988Abstract: A resonant converter includes a primary-side winding electrically coupled to an input voltage, a secondary-side winding electrically coupled to a load, first and second switches coupled to one end of the primary-side winding, and a switch control circuit configured to differently control switching frequency limit ratios of the first and second switches by differently limiting a frequency variation ratio of a first clock signal that determines switching frequencies of the first and second switches according to variation of one of the input voltage and the load.Type: GrantFiled: February 5, 2015Date of Patent: April 18, 2017Assignee: Fairchild Korea Semiconductor LTD.Inventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi
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Patent number: 9374008Abstract: The present invention relates to a switching mode power supply and a driving method thereof. In the present invention, a supply voltage is generated by using a start voltage that corresponds to input power, and a switching operation frequency of a power switch is changed according to an increase/decrease of the supply voltage.Type: GrantFiled: August 20, 2009Date of Patent: June 21, 2016Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Kyung-Oun Jang, Gyoung-Soo Park, Hyeong-Seok Baek, Se-Hwan Kim
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Publication number: 20160172989Abstract: A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch.Type: ApplicationFiled: December 10, 2015Publication date: June 16, 2016Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Won-Tae LEE, Ji-Hoon JANG, Hyeong Seok BAEK, Hang-Seok CHOI
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Publication number: 20160172958Abstract: A modulation mode control circuit includes a modulation mode controller configured to select modulation mode based on the result of a comparison between a control voltage and a predetermined PWM threshold voltage and to generate a PWM reference voltage using the PWM threshold voltage and the control voltage and a control signal generation unit configured to generate a first control signal based on the result of a comparison between an oscillation control signal for controlling a switching frequency and the control voltage and the result of a comparison between the oscillation control signal and the PWM threshold voltage and to generate a second control signal based on the result of a comparison between the oscillation control signal and the PWM reference voltage.Type: ApplicationFiled: December 10, 2015Publication date: June 16, 2016Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Won-Tae LEE, Ji-Hoon JANG, Hyeong Seok BAEK
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Publication number: 20160172841Abstract: A protection mode control circuit includes an auto-restart counter configured to count the cycle of a first signal in a protection condition and to generate an auto-restart signal when a result of the count reaches a protection reference value and a latch mode unit configured to generate a latch mode signal for changing protection mode to latch mode when the auto-restart signal is consecutively generated by a predetermined threshold number.Type: ApplicationFiled: December 10, 2015Publication date: June 16, 2016Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Won-Tae LEE, Ji-Hoon JANG, Hyeong Seok BAEK, Hang-Seok CHOI
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Publication number: 20150229201Abstract: A resonant converter includes a primary-side winding electrically coupled to an input voltage, a secondary-side winding electrically coupled to a load, first and second switches coupled to one end of the primary-side winding, and a switch control circuit configured to differently control switching frequency limit ratios of the first and second switches by differently limiting a frequency variation ratio of a first clock signal that determines switching frequencies of the first and second switches according to variation of one of the input voltage and the load.Type: ApplicationFiled: February 5, 2015Publication date: August 13, 2015Inventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI
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Publication number: 20150229220Abstract: A resonant converter includes a first switch coupled between a first node and a primary side ground, a second switch coupled between an input voltage and the first node, at least one capacitor and at least one inductor coupled in series between both ends of the first switch, and a switch control circuit that shifts switching frequencies of the first and second switches during a period for which an abnormal event lasts when occurrence of the abnormal event is detected, and shifts the switching frequencies in an opposite direction when the abnormal event ends.Type: ApplicationFiled: February 11, 2015Publication date: August 13, 2015Inventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI
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Publication number: 20150229226Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: ApplicationFiled: February 11, 2015Publication date: August 13, 2015Inventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI, Moon-Ho CHOI
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Publication number: 20100053999Abstract: The present invention relates to a switching mode power supply and a driving method thereof. In the present invention, a supply voltage is generated by using a start voltage that corresponds to input power, and a switching operation frequency of a power switch is changed according to an increase/decrease of the supply voltage.Type: ApplicationFiled: August 20, 2009Publication date: March 4, 2010Inventors: Kyung-Oun JANG, Gyoung-Soo PARK, Hyeong-Seok BAEK, Se-Hwan KIM