Patents by Inventor Bong-hwan Kwon
Bong-hwan 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: 8508959Abstract: A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary winding of the transformer according to the first output voltage. The multi-voltage power supply includes second through Nth output circuits to generate second through Nth output voltages using the voltage transferred to the secondary winding of the transformer, and second through Nth output voltage controllers performing control in order to linearly output the second through Nth output voltages by feeding back the second through Nth output voltages.Type: GrantFiled: April 6, 2011Date of Patent: August 13, 2013Assignee: SAMSUNG Electronics Co., Ltd.Inventor: Bong-hwan Kwon
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Publication number: 20110181112Abstract: A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary winding of the transformer according to the first output voltage. The multi-voltage power supply includes second through Nth output circuits to generate second through Nth output voltages using the voltage transferred to the secondary winding of the transformer, and second through Nth output voltage controllers performing control in order to linearly output the second through Nth output voltages by feeding back the second through Nth output voltages.Type: ApplicationFiled: April 6, 2011Publication date: July 28, 2011Applicant: Samsung Electronics Co., LtdInventor: Bong-hwan KWON
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Patent number: 7940538Abstract: A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary winding of the transformer according to the first output voltage. The multi-voltage power supply includes second through Nth output circuits to generate second through Nth output voltages using the voltage transferred to the secondary winding of the transformer, and second through Nth output voltage controllers performing control in order to linearly output the second through Nth output voltages by feeding back the second through Nth output voltages.Type: GrantFiled: January 20, 2010Date of Patent: May 10, 2011Assignee: SAMSUNG Electronics Co., Ltd.Inventor: Bong-hwan Kwon
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Publication number: 20100118566Abstract: A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary winding of the transformer according to the first output voltage. The multi-voltage power supply includes second through Nth output circuits to generate second through Nth output voltages using the voltage transferred to the secondary winding of the transformer, and second through Nth output voltage controllers performing control in order to linearly output the second through Nth output voltages by feeding back the second through Nth output voltages.Type: ApplicationFiled: January 20, 2010Publication date: May 13, 2010Applicant: Samsung Electronics Co., LtdInventor: Bong-hwan KWON
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Patent number: 7675762Abstract: A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary winding of the transformer according to the first output voltage. The multi-voltage power supply includes second through Nth output circuits to generate second through Nth output voltages using the voltage transferred to the secondary winding of the transformer, and second through Nth output voltage controllers performing control in order to linearly output the second through Nth output voltages by feeding back the second through Nth output voltages.Type: GrantFiled: July 25, 2006Date of Patent: March 9, 2010Assignee: Samsung Electronics Co., Ltd.Inventor: Bong-hwan Kwon
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Patent number: 7605808Abstract: Disclosed are an energy recovery apparatus and method for a plasma display panel. The energy recovery apparatus includes a sustain voltage source for supplying a sustain voltage, a panel capacitor formed equivalently at a discharge cell, a first charging circuit for forming a first charging path when one side of the panel capacitor is charged, a second charging circuit for forming a second charging path when the other side of the panel capacitor is charged, a first power circuit for supplying the sustain voltage to the panel capacitor and forming the first charging path, and a second power circuit for supplying a ground voltage generated from a ground voltage source to the panel capacitor and forming the second charging path. The energy recovery apparatus and method according to the present invention can decrease components in number and reduce power consumption and manufacturing cost by charging the other side of the panel capacitor using a charging voltage of one side of the panel capacitor.Type: GrantFiled: September 16, 2004Date of Patent: October 20, 2009Assignee: LG Electronics Inc.Inventors: Nam Kyu Lee, Bong Gyun Kim, Bong Hwan Kwon, Jang Hwan Cho
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Patent number: 7573731Abstract: Provided is a current-source push-pull DC-DC converter using an active clamp circuit for reusing energy of leakage inductances by not only diodes on a secondary side of a transformer being zero-current switched using a series-resonant full-wave rectifier, but also the active clamp circuit on a primary side of the transformer, which provides a discharge path of the energy stored in the leakage inductances, increases power conversion efficiency even for a wide input voltage range and reduces a switch voltage stress as compared to a conventional current-source push-pull circuit by operating even for a duty ratio below 0.5 by flowing a current of an input inductor through capacitors of the active clamp circuit when both main switches are off.Type: GrantFiled: August 24, 2006Date of Patent: August 11, 2009Assignees: Postech Academy-Industry Foundation, Postech FoundationInventors: Bong Hwan Kwon, Jung Min Kwon
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Publication number: 20070247877Abstract: Provided is a current-source push-pull DC-DC converter using an active clamp circuit for reusing energy of leakage inductances by not only diodes on a secondary side of a transformer being zero-current switched using a series-resonant full-wave rectifier, but also the active clamp circuit on a primary side of the transformer, which provides a discharge path of the energy stored in the leakage inductances, increases power conversion efficiency even for a wide input voltage range and reduces a switch voltage stress as compared to a conventional current-source push-pull circuit by operating even for a duty ratio below 0.5 by flowing a current of an input inductor through capacitors of the active clamp circuit when both main switches are off.Type: ApplicationFiled: August 24, 2006Publication date: October 25, 2007Applicants: POSTECH FOUNDATION, POSTECH ACADEMY-INDUSTRY FOUNDATIONInventors: Bong Hwan KWON, Jung Min KWON
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Publication number: 20070247880Abstract: Provided is a full-bridge active clamp DC-DC converter for reducing power loss due to high-speed switching by primary switches that are zero-voltage switched by energy stored as a leakage inductance of a transformer when main switches are on or off using a full-bridge active clamp circuit, which can be used at capacity, e.g., more than 1 KW. The full-bridge active clamp DC-DC converter includes a primary circuit and a secondary circuit divided by a transformer, the primary circuit, which is a full-bridge active clamp circuit, comprising an input capacitor Cd, two main switches S1 and S2, two sub-switches S3 and S4, and a clamp capacitor Cc, and the secondary circuit, which is an output rectification circuit for rectifying an output voltage.Type: ApplicationFiled: August 24, 2006Publication date: October 25, 2007Applicants: POSTECH FOUNDATION, POSTECH ACADEMY-INDUSTRY FOUNDATIONInventors: Bong Hwan KWON, Jung Min KWON
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Publication number: 20070025031Abstract: A multi-voltage power supply includes a transformer, a first output circuit to generate a first output voltage using a voltage transferred to a secondary winding of the transformer, and a first output voltage controller to control a voltage supplied to the primary winding of the transformer according to the first output voltage. The multi-voltage power supply includes second through Nth output circuits to generate second through Nth output voltages using the voltage transferred to the secondary winding of the transformer, and second through Nth output voltage controllers performing control in order to linearly output the second through Nth output voltages by feeding back the second through Nth output voltages.Type: ApplicationFiled: July 25, 2006Publication date: February 1, 2007Applicant: SAMSUNG Electronics Co., Ltd.Inventor: Bong-hwan Kwon
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Patent number: 6798674Abstract: A half-bridge converter having an improved power factor is provided. The half-bridge converter has a bridge diode unit for providing a current path to a power factor improving unit and transmitting energy to a voltage smoothing capacitor; the voltage smoothing capacitor for storing energy provided by the bridge diode unit; and a switching unit having two switches serially connected between both ends of the voltage smoothing capacitor, in which the power factor improving unit for feeding the voltage of the common connection point of the switches forming the switching unit back to the common connection point of the input capacitors so as to change an input current according to the magnitude of the input voltage is further included. According to the half-bridge converter, conducting loss occurring in the switching unit decreases and the power factor of the input terminal is improved.Type: GrantFiled: October 18, 2002Date of Patent: September 28, 2004Assignee: Postech FoundationInventor: Bong-Hwan Kwon
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Patent number: 6697269Abstract: A single-stage converter improving power factor. The single-stage converter includes a power factor improving unit, a bridge diode unit, a voltage smoothing condenser, a transformer circuit unit, and a main switch. The power factor improving unit is connected to a input power source, the bridge diode unit is located next to the power factor improving unit and provides a current path, the voltage smoothing condenser stores electrical energy provided through the bridge diode unit, the transformer circuit unit is located between the bridge diode unit and the voltage smoothing condenser, and the main switch is connected to each of the bridge diode unit, the voltage smoothing condenser, and the transformer circuit unit and controls provision of voltage to the transformer circuit unit. Thus, the single-stage converter can improve the power factor of the input terminal.Type: GrantFiled: September 16, 2002Date of Patent: February 24, 2004Assignee: Pohang University of Science and Technology FoundationInventor: Bong-hwan Kwon
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Publication number: 20030161169Abstract: A single-stage converter improving the power factor is provided. The single-stage converter comprises a power factor improving unit, a bridge diode unit, a voltage smoothing condenser, a transformer circuit unit, and a main switch. The power factor improving unit is connected to a predetermined input power source, the bridge diode unit is located next to the power factor improving unit and provides a current path, the voltage smoothing condenser stores electric energy provided through the bridge diode unit, the transformer circuit unit is located between the bridge diode unit and the voltage smoothing condenser, and the main switch is connected to each of the bridge diode unit, the voltage smoothing condenser, and the transformer circuit unit and controls provision of voltage to the transformer circuit unit. Thus, the single-stage converter can improve the power factor of the input terminal.Type: ApplicationFiled: September 16, 2002Publication date: August 28, 2003Applicant: Pohang University of Science and Technology FoundationInventor: Bong-hwan Kwon
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Publication number: 20030076699Abstract: A half-bridge converter having an improved power factor is provided. The half-bridge converter has a bridge diode unit for providing a current path to a power factor improving unit and transmitting energy to a voltage smoothing capacitor; the voltage smoothing capacitor for storing energy provided by the bridge diode unit; and a switching unit having two switches serially connected between both ends of the voltage smoothing capacitor, in which the power factor improving unit for feeding the voltage of the common connection point of the switches forming the switching unit back to the common connection point of the input capacitors so as to change an input current according to the magnitude of the input voltage is further included. According to the half-bridge converter, conducting loss occurring in the switching unit decreases and the power factor of the input terminal is improved.Type: ApplicationFiled: October 18, 2002Publication date: April 24, 2003Inventor: Bong-Hwan Kwon