Patents by Inventor Yun-Ching Wu
Yun-Ching Wu 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: 7884796Abstract: A lamp driving structure for backlight module includes a backlight module implemented for disposing a first circuit board and a second circuit board thereon, the first circuit board couples with the second circuit board through a transmission line; the structure further includes at least a square wave controller, two square wave switches, a mutually coupled transformer, a plurality of driving transformers and a plurality of connectors disposed selectively on the first circuit board and the second circuit board, thereby reducing the number of driving transformers and connectors and the area of circuit boards to further reduce the manufacturing cost of the lamp driving device.Type: GrantFiled: September 10, 2007Date of Patent: February 8, 2011Assignee: Logah Technology Corp.Inventors: Cheng-Chia Hsu, Teng-Kang Chang, Yun-Ching Wu, Yu-Cheng Pan
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Patent number: 7741789Abstract: The locked phase active power current control circuit is composed of a DC source, an electronic switch, a driving transformer, a phase detecting unit, a current intercepting unit and a square wave controller. A DC signal provided by the DC source is converted into a square wave signal by the electronic switch for the driving transformer to operate a load. The electronic switch outputs the square wave signal to the phase detecting unit whereat a phase signal of the square wave is detected and the detected signal is transmitted to the current intercepting unit whereat the detected signal is compared with the current intercepted at the electronic switch, the driving transformer, or the load, and the comparison result is fed back to the square wave controller so as to set the operation frequency of the electronic switch. The essential principle of the present invention is based on the fact that the square wave is in phase with the first harmonic wave.Type: GrantFiled: September 21, 2007Date of Patent: June 22, 2010Assignee: Logah Technology Corp.Inventors: Cheng-Chia Hsu, Teng-Kang Chang, Yun-Ching Wu
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Patent number: 7675243Abstract: A two-end driven lamp controlling device includes a direct-current (DC) power supply, square wave switches, a square wave controller, a plurality of lamps, a plurality of starting transformers and a plurality of lamps commonly connective transformers, wherein the plurality of starting transformers or the plurality of lamps commonly connective transformers are disposed besides the plurality of lamps and the square wave switches are connected to the sides of the plurality of starting transformers or the plurality of lamps commonly connective transformers and to the DC power supply and can receive signals from the square wave controller.Type: GrantFiled: November 13, 2007Date of Patent: March 9, 2010Assignee: Logah Technology Corp.Inventors: Cheng-Chia Hsu, Teng-Kang Chang, Yun-Ching Wu, Yu-Cheng Pan
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Publication number: 20090079478Abstract: The locked phase active power current control circuit is composed of a DC source, an electronic switch, a driving transformer, a phase detecting unit, a current intercepting unit and a square wave controller. A DC signal provided by the DC source is converted into a square wave signal by the electronic switch for the driving transformer to operate a load. The electronic switch outputs the square wave signal to the phase detecting unit whereat a phase signal of the square wave is detected and the detected signal is transmitted to the current intercepting unit whereat the detected signal is compared with the current intercepted at the electronic switch, the driving transformer, or the load, and the comparison result is fed back to the square wave controller so as to set the operation frequency of the electronic switch. The essential principle of the present invention is based on the fact that the square wave is in phase with the first harmonic wave.Type: ApplicationFiled: September 21, 2007Publication date: March 26, 2009Applicant: LOGAH TECHNOLOGY CORP.Inventors: Cheng-Chia Hsu, Teng-Kang Chang, Yun-Ching Wu
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Publication number: 20090066629Abstract: A lamp driving structure for backlight module includes a backlight module implemented for disposing a first circuit board and a second circuit board thereon, the first circuit board couples with the second circuit board through a transmission line; the structure further includes at least a square wave controller, two square wave switches, a mutually coupled transformer, a plurality of driving transformers and a plurality of connectors disposed selectively on the first circuit board and the second circuit board, thereby reducing the number of driving transformers and connectors and the area of circuit boards to further reduce the manufacturing cost of the lamp driving device.Type: ApplicationFiled: September 10, 2007Publication date: March 12, 2009Inventors: Cheng-Chia Hsu, Teng-Kang Chang, Yun-Ching Wu, Yu-Cheng Pan
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Publication number: 20080116824Abstract: A two-end driven lamp controlling device includes a direct-current (DC) power supply, square wave switches, a square wave controller, a plurality of lamps, a plurality of starting transformers and a plurality of lamps commonly connective transformers, wherein the plurality of starting transformers or the plurality of lamps commonly connective transformers are disposed besides the plurality of lamps and the square wave switches are connected to the sides of the plurality of starting transformers or the plurality of lamps commonly connective transformers and to the DC power supply and can receive signals from the square wave controller.Type: ApplicationFiled: November 13, 2007Publication date: May 22, 2008Inventors: Cheng-Chia Hsu, Teng-Kang Chang, Yun-Ching Wu, Yu-Cheng Pan
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Publication number: 20080089103Abstract: A high efficiency DC to AC power converter capable of achieving zero voltage switching by provision of an inductive impedance in a conversion circuit. The inductive impedance takes a form of an inductance connected in series with a capacitor. In addition, the inductive impedance may be provided in a half-wave or full-wave conversion circuit for the high efficiency DC to AC power converter.Type: ApplicationFiled: December 10, 2007Publication date: April 17, 2008Inventors: Cheng-Chia HSU, Yun-Ching WU
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Publication number: 20080076296Abstract: A transformer with a connector is described, having a primary side and a secondary side and composed of a winding base, a core and windings, wherein the core is inserted into the winding base and the windings are wound on the winding base, and the transformer is characterized in that a connector is disposed at the secondary side of the transformer and connected to an external connector disposed at a load to which a signal fed through the primary side to the transformer is outputted when the connector and the external connector are connected to each other. In the transformer, the connector conventionally disposed on the circuit board is disposed on the transformer, saving the space that would otherwise be needed for connection wires between the transformer and the connector. Therefore, the circuit board has a reduced area, effectively saving the manufacturing cost for a product to which the circuit board is applied.Type: ApplicationFiled: September 27, 2006Publication date: March 27, 2008Applicant: LOGAH TECHNOLOGY CORP.Inventors: Cheng-Chia Hsu, Yun-Ching Wu
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Patent number: 7268500Abstract: A control device for multiple lamp currents of a liquid crystal display (LCD) backlight source, comprising an electronic power switch, a transformer, an inverter and an integrated circuit (IC) feedback control module. The transformer has a primary side connected to the electronic power switch and a secondary side having two ends each connected to an end of a set of lamp composed of two lamps. The inverter has three sets of coil connected to the other end of the two sets of lamp. The IC feedback control module is connected between the inverter and the electronic power switch and through which currents flown through the two sets of lamp may be balanced. Meanwhile, the current flown through the inverter is feedback to the IC feedback control module by which a control signal is outputted to the electronic power switch by determining and processing the feedback current, thereby controlling an output signal from the electronic power switch.Type: GrantFiled: January 20, 2006Date of Patent: September 11, 2007Assignee: Logah Technology Corp.Inventors: Cheng-Chia Hsu, Yun-Ching Wu, Teng-Kang Chang
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Patent number: 7253564Abstract: A lamp current balancing device comprises an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC; the transformer having a primary side connected to the electronic power switch and both ends of a secondary side connected to one end of each one of two lamps respectively, with another end of each one of the two lamps connecting to one end of a primary side of the current transformer respectively, the PWM IC being coupled between a secondary side of the current transformer and the electronic power switch; since the two lamps being cascaded in series with a same current flowing through them, thus providing current balancing capability, furthermore, the current transformer being used to detect an operating current of the lamps and to feed back the operating current to the PWM IC, the PWM IC receiving and processing the operating current to obtain a control signal, then outputting the control signal to the electronic power switch to control a pulse width outputted byType: GrantFiled: September 23, 2005Date of Patent: August 7, 2007Assignee: Logah Technology Corp.Inventors: Cheng-Chia Hsu, Yun-Ching Wu, Teng-Kang Chang
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Publication number: 20070170871Abstract: A control device for multiple lamp currents of a liquid crystal display (LCD) backlight source, comprising an electronic power switch, a transformer, an inverter and an integrated circuit (IC) feedback control module. The transformer has a primary side connected to the electronic power switch and a secondary side having two ends each connected to an end of a set of lamp composed of two lamps. The inverter has three sets of coil connected to the other end of the two sets of lamp. The IC feedback control module is connected between the inverter and the electronic power switch and through which currents flown through the two sets of lamp may be balanced. Meanwhile, the current flown through the inverter is feedback to the IC feedback control module by which a control signal is outputted to the electronic power switch by determining and processing the feedback current, thereby controlling an output signal from the electronic power switch.Type: ApplicationFiled: January 20, 2006Publication date: July 26, 2007Inventors: Cheng-Chia Hsu, Yun-Ching Wu, Teng-Kang Chang
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Publication number: 20060279973Abstract: A high efficiency DC to AC power converter capable of achieving zero switching by provision of an inductive resistance in a conversion circuit. The inductive resistance may take a form of a single inductance, an inductance connected in series with a capacitor, an inductor, a capacitor and a resistor connected in series, or a capacitor, an inductor, a capacitor and a resistor connected in series and parallel. In addition, the inductive resistance may be provided in a semi- or full-wave conversion circuit for the high efficiency DC to AC power covnerter.Type: ApplicationFiled: June 13, 2005Publication date: December 14, 2006Inventors: Cheng-Chia Hsu, Yun-Ching Wu
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Publication number: 20060113925Abstract: A lamp current balancing device comprises an electronic power switch, a transformer, a current transformer and a pulse width modulation (PWM) IC; the transformer having a primary side connected to the electronic power switch and both ends of a secondary side connected to one end of each one of two lamps respectively, with another end of each one of the two lamps connecting to one end of a primary side of the current transformer respectively, the PWM IC being coupled between a secondary side of the current transformer and the electronic power switch; since the two lamps being cascaded in series with a same current flowing through them, thus providing current balancing capability, furthermore, the current transformer being used to detect an operating current of the lamps and to feed back the operating current to the PWM IC, the PWM IC receiving and processing the operating current to obtain a control signal, then outputting the control signal to the electronic power switch to control a pulse width outputted byType: ApplicationFiled: September 23, 2005Publication date: June 1, 2006Inventors: Cheng-Chia Hsu, Yun-Ching Wu, Teng-Kang Chang