Patents by Inventor Chih-Liang Wang
Chih-Liang Wang 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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Publication number: 20130235151Abstract: An image adjusting method for extending vertical blanking intervals of an image signal is provided. Using the image adjusting method, an adjusted image signal is synchronized with an image signal before the adjustment to prevent image delay. The image adjusting method comprises providing a first image signal having a first data enable signal, wherein the first data enable signal has a first data enable duration; and generating a second data enable signal having a second data enable duration. The first and second data enable durations correspond to a same image frame of an image signal, and the second data enable duration substantially overlaps the first data enable duration.Type: ApplicationFiled: April 22, 2013Publication date: September 12, 2013Applicant: MStar Semiconductor, Inc.Inventors: JIUNN-KUANG CHEN, CHIEH-HUANG TU, CHIH-LIANG WANG
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Patent number: 8482596Abstract: An image adjusting method for extending vertical blanking intervals of an image signal is provided. Using the image adjusting method, an adjusted image signal is synchronized with an image signal before the adjustment to prevent image delay. The image adjusting method comprises providing a first image signal having a first data enable signal, wherein the first data enable signal has a first data enable duration; and generating a second data enable signal having a second data enable duration. The first and second data enable durations correspond to a same image frame of an image signal, and the second data enable duration substantially overlaps the first data enable duration.Type: GrantFiled: February 11, 2010Date of Patent: July 9, 2013Assignee: MStar Semiconductor, Inc.Inventors: Jiunn-Kuang Chen, Chieh-Huang Tu, Chih-Liang Wang
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Patent number: 8363437Abstract: Owing to the property of bidirectional conduction under the saturation mode, synchronous rectifiers in conventional power converters usually suffer from a reverse current under light loads or a shoot-through current under heavy loads. The reverse current may degrade the converter efficiency and the shoot-through current may damage synchronous rectifiers. The present invention discloses a unidirectional metal oxide semiconductor field effect transistor (UMOS), which comprises a metal oxide semiconductor field effect transistor (MOS), a current detection circuit and a fast turn-off circuit. The current detection circuit detects the direction of the current flowing through the MOS. When a forward current is detected, the fast turn-off circuit is disabled and the channel of the MOS can be formed. When a reverse current is detected, the fast turn-off circuit is enabled and the channel of the MOS cannot be formed.Type: GrantFiled: September 4, 2009Date of Patent: January 29, 2013Assignees: GlacialTech, Inc.Inventors: Chih-Liang Wang, Ching-Sheng Yu, Po-Tai Wong
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Patent number: 8031500Abstract: The present invention discloses a bridgeless active power factor corrector with a logic control comprising a high frequency switch controller, a boost inductor, an output filtering capacitor, two boost transistor modules, two boost diodes, two AC input voltage polarity detectors, and two low frequency switch drivers. With a coupling signal, the two AC input voltage polarity detectors respectively control the two low frequency switch drivers in conjunction with the high frequency switch controller to drive the two boost transistor modules with a logic control so that the inductor current releasing electric energy from the boost inductor can flow through the channels of the two boost transistor modules to effectively reduce the body diode conduction loss.Type: GrantFiled: May 10, 2010Date of Patent: October 4, 2011Assignee: GlacialTech., Inc.Inventors: Chih-Liang Wang, Ching-Sheng Yu
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Patent number: 7885086Abstract: The present invention relates to a forward converter with self-driven synchronous rectifiers, which utilizes a secondary driving winding and a secondary driving circuit to drive the synchronous rectifiers in the secondary power loop. The secondary driving circuit, which is composed of a level shifter and a signal distributor, can shift the voltage waveform across the secondary driving winding by a predetermined level and distribute proper driving signals to the synchronous rectifiers to reduce the rectifier conduction loss. Specially, the channel of the freewheeling synchronous rectifier still can be turned on during the dead interval to further reduce the body diode conduction loss.Type: GrantFiled: August 28, 2008Date of Patent: February 8, 2011Assignees: GlacialTech, Inc.Inventors: Chih-Liang Wang, Ching-Sheng Yu
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Patent number: 7884663Abstract: Conventional diode rectifiers usually suffer from a higher conduction loss. The present invention discloses a gate-controlled rectifier, which comprises a line voltage polarity detection circuit, a constant voltage source, a driving circuit and a gate-controlled transistor. The line voltage polarity detection circuit detects the polarity of the line voltage and controls the driving circuit to turn on or turn off the gate-controlled transistor. The gate-controlled transistor may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with a gate, a source and a drain or an Insulated Gate Bipolar Transistor (IGBT) with a gate, an emitter and a collector. The constant voltage source is provided or induced by external circuits and referred to the source of the MOSFET or the emitter of the IGBT. Thanks to a lower conduction loss, this gate-controlled rectifier can be applied to rectification circuits to increase the rectification efficiency.Type: GrantFiled: September 29, 2009Date of Patent: February 8, 2011Assignees: GlacialTech, Inc.Inventors: Chih-Liang Wang, Ching-Sheng Yu, Po-Tai Wong
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Publication number: 20110013424Abstract: The present invention discloses a forward converter with secondary side post-regulation and zero voltage switching, where the primary side power loop may adopt a single or a dual transistor structure, driven by a primary side driving circuit with a constant duty ratio so that the voltage waveform across the secondary side power winding has a constant pulse width; the secondary side power loop uses a controllable switch, a magnetic amplifier (MA) or an N channel metal oxide semiconductor field transistor (NMOS), to blank the leading edge of the voltage waveform across the secondary side power winding, regulate the output voltage, and achieve zero voltage switching of primary side switch transistors.Type: ApplicationFiled: July 13, 2010Publication date: January 20, 2011Applicants: GlacialTech., Inc.Inventors: Chih-Liang WANG, Ching-Sheng YU
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Publication number: 20100302133Abstract: An apparatus for controlling a display having a backlight module provided with a first set of units and a display panel provided with a second set of units is provided. In one embodiment, the apparatus comprises a reference value generator, a control value generator, and a compensation circuit. The reference value generator generates a reference value representative of a portion of pixels contained in an input image associated with one of the second set of units. The control value generator generates a control value to control one of the first set of units in view of the reference value. The compensation circuit adjusts the portion of pixels contained in the input image in view of the control value. The one of the first units is associated with the one of the second units.Type: ApplicationFiled: May 27, 2010Publication date: December 2, 2010Applicant: MSTAR SEMICONDUCTOR, INC.Inventors: Ren Kuan Liang, Chao-Chi Yeh, Chih-Liang Wang
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Publication number: 20100289461Abstract: The present invention discloses a bridgeless active power factor corrector with a logic control comprising a high frequency switch controller, a boost inductor, an output filtering capacitor, two boost transistor modules, two boost diodes, two AC input voltage polarity detectors, and two low frequency switch drivers. With a coupling signal, the two AC input voltage polarity detectors respectively control the two low frequency switch drivers in conjunction with the high frequency switch controller to drive the two boost transistor modules with a logic control so that the inductor current releasing electric energy from the boost inductor can flow through the channels of the two boost transistor modules to effectively reduce the body diode conduction loss.Type: ApplicationFiled: May 10, 2010Publication date: November 18, 2010Inventors: Chih-Liang WANG, Ching-Sheng Yu
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Patent number: 7796408Abstract: The present invention discloses a half-bridge LLC resonant converter with self-driven synchronous rectifiers, which utilizes a primary IC controller and a gate driver to drive the secondary synchronous rectifiers. In correspondence with the gate drive output voltages of the primary IC controller to the primary switch transistors, the gate driver for the secondary synchronous rectifiers comprises a differential transformer if the primary IC controller outputs two ground-referenced gate drive voltages, which cannot directly drive the primary switch transistors but can be imposed on the differential transformer; or comprises a DC shifter, a DC restorer and a differential transformer if the primary IC controller outputs two gate-source voltages, which can directly drive the primary switch transistors but cannot be imposed on the differential transformer. The drive voltages of the primary switch transistors are unipolar; however the drive voltage of the secondary synchronous rectifiers can be bipolar or unipolar.Type: GrantFiled: December 30, 2008Date of Patent: September 14, 2010Assignees: GlacialTech, Inc., Chih-Liang WangInventors: Chih-Liang Wang, Ching-Sheng Yu
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Publication number: 20100207939Abstract: An image adjusting method for extending vertical blanking intervals of an image signal is provided. Using the image adjusting method, an adjusted image signal is synchronized with an image signal before the adjustment to prevent image delay. The image adjusting method comprises providing a first image signal having a first data enable signal, wherein the first data enable signal has a first data enable duration; and generating a second data enable signal having a second data enable duration. The first and second data enable durations correspond to a same image frame of an image signal, and the second data enable duration substantially overlaps the first data enable duration.Type: ApplicationFiled: February 11, 2010Publication date: August 19, 2010Applicant: MStar Semiconductor, Inc.Inventors: JIUNN-KUANG CHEN, Chieh-huang Tu, Chih-Liang Wang
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Publication number: 20100123517Abstract: Conventional diode rectifiers usually suffer from a higher conduction loss. The present invention discloses a gate-controlled rectifier, which comprises a line voltage polarity detection circuit, a constant voltage source, a driving circuit and a gate-controlled transistor. The line voltage polarity detection circuit detects the polarity of the line voltage and controls the driving circuit to turn on or turn off the gate-controlled transistor. The gate-controlled transistor may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with a gate, a source and a drain or an Insulated Gate Bipolar Transistor (IGBT) with a gate, an emitter and a collector. The constant voltage source is provided or induced by external circuits and referred to the source of the MOSFET or the emitter of the IGBT. Thanks to a lower conduction loss, this gate-controlled rectifier can be applied to rectification circuits to increase the rectification efficiency.Type: ApplicationFiled: September 29, 2009Publication date: May 20, 2010Inventors: Chih-Liang WANG, Ching-Sheng Yu, Po-Tai Wong
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Publication number: 20100067275Abstract: Owing to the property of bidirectional conduction under the saturation mode, synchronous rectifiers in conventional power converters usually suffer from a reverse current under light loads or a shoot-through current under heavy loads. The reverse current may degrade the converter efficiency and the shoot-through current may damage synchronous rectifiers. The present invention discloses a unidirectional metal oxide semiconductor field effect transistor (UMOS), which comprises a metal oxide semiconductor field effect transistor (MOS), a current detection circuit and a fast turn-off circuit. The current detection circuit detects the direction of the current flowing through the MOS. When a forward current is detected, the fast turn-off circuit is disabled and the channel of the MOS can be formed. When a reverse current is detected, the fast turn-off circuit is enabled and the channel of the MOS cannot be formed.Type: ApplicationFiled: September 4, 2009Publication date: March 18, 2010Inventors: Chih-Liang WANG, Ching-Sheng Yu, Po-Tai Wong
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Publication number: 20090244933Abstract: The present invention discloses a half-bridge LLC resonant converter with self-driven synchronous rectifiers, which utilizes a primary IC controller and a gate driver to drive the secondary synchronous rectifiers. In correspondence with the gate drive output voltages of the primary IC controller to the primary switch transistors, the gate driver for the secondary synchronous rectifiers comprises a differential transformer if the primary IC controller outputs two ground-referenced gate drive voltages, which cannot directly drive the primary switch transistors but can be imposed on the differential transformer; or comprises a DC shifter, a DC restorer and a differential transformer if the primary IC controller outputs two gate-source voltages, which can directly drive the primary switch transistors but cannot be imposed on the differential transformer. The drive voltages of the primary switch transistors are unipolar; however the drive voltage of the secondary synchronous rectifiers can be bipolar or unipolar.Type: ApplicationFiled: December 30, 2008Publication date: October 1, 2009Inventors: Chih-Liang WANG, Ching-Sheng Yu
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Publication number: 20090080223Abstract: The present invention relates to a forward converter with self-driven synchronous rectifiers, which utilizes a secondary driving winding and a secondary driving circuit to drive the synchronous rectifiers in the secondary power loop. The secondary driving circuit, which is composed of a level shifter and a signal distributor, can shift the voltage waveform across the secondary driving winding by a predetermined level and distribute proper driving signals to the synchronous rectifiers to reduce the rectifier conduction loss. Specially, the channel of the freewheeling synchronous rectifier still can be turned on during the dead interval to further reduce the body diode conduction loss.Type: ApplicationFiled: August 28, 2008Publication date: March 26, 2009Inventors: Chih-Liang Wang, Ching-Sheng Yu
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Publication number: 20060041334Abstract: Toxic chemical substrate management systems for use in a factory having a material management system are disclosed. The toxic chemical substrate management system includes at least a server, a processing unit and a database. The server is coupled to the material management system to receive toxic chemical substrate information, comprising identification to be stored in the database. The server receives an instruction, and the processing unit manages operations of the toxic chemical substrate according to the identification and the instruction. The operations include request, use, storage and return of the toxic chemical substrate. The toxic chemical substrate management system further provides interfaces to query the stock, use volume, operating amount, type of the toxic chemical substrate, and suppliers and operating region thereof.Type: ApplicationFiled: April 6, 2005Publication date: February 23, 2006Inventors: Ching-Hui Chen, Chi-Bing Liu, Chih-Liang Wang, Ching-Lung Cheng