Patents by Inventor Ko-Cheng Wang
Ko-Cheng 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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Patent number: 11962847Abstract: A channel hiatus correction method for an HDMI device is provided. A recovery code from scrambled data of the stream is obtained. A liner feedback shift register (LFSR) value of channels of the HDMI port is obtained based on the recovery code and the scrambled data of the stream. The stream is de-scrambled according to the LFSR value of the channels of the HDMI port. Video data is displayed according to the de-scrambled stream.Type: GrantFiled: November 9, 2022Date of Patent: April 16, 2024Assignee: MEDIATEK INC.Inventors: Chia-Hao Chang, You-Tsai Jeng, Kai-Wen Yeh, Yi-Cheng Chen, Te-Chuan Wang, Kai-Wen Cheng, Chin-Lung Lin, Tai-Lai Tung, Ko-Yin Lai
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Publication number: 20240096784Abstract: Some embodiments of the present disclosure relate to an integrated chip including an extended via that spans a combined height of a wire and a via and that has a smaller footprint than the wire. The extended via may replace a wire and an adjoining via at locations where the sizing and the spacing of the wire are reaching lower limits. Because the extended via has a smaller footprint than the wire, replacing the wire and the adjoining via with the extended via relaxes spacing and allows the size of the pixel to be further reduced. The extended via finds application for capacitor arrays used for pixel circuits.Type: ApplicationFiled: January 3, 2023Publication date: March 21, 2024Inventors: Meng-Hsien Lin, Hsing-Chih Lin, Ming-Tsong Wang, Min-Feng Kao, Kuan-Hua Lin, Jen-Cheng Liu, Dun-Nian Yaung, Ko Chun Liu
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Patent number: 9489001Abstract: A constant ON-time or constant OFF-time switching power converter includes a control circuit for controlling a power switch. The control circuit includes: a constant ON-time or constant OFF-time calculation circuit, for calculating a constant ON-time or constant OFF-time; a logic circuit having inputs for receiving an output of the constant ON-time or constant OFF-time calculation circuit and a clock signal, respectively, wherein the clock signal has a frequency which is the desired fixed frequency; and a flip-flop for generating an output signal according to a set input and a reset input, wherein one of the set input and the reset input receives an output of the logic circuit, and the other one of the set input and the reset input receives a trigger signal which determines a start time of the ON-time or OFF-time.Type: GrantFiled: June 10, 2015Date of Patent: November 8, 2016Assignee: RICHTEK TECHNOLOGY CORPORATIONInventor: Ko-Cheng Wang
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Publication number: 20150362937Abstract: A constant ON-time or constant OFF-time switching power converter includes a control circuit for controlling a power switch. The control circuit includes: a constant ON-time or constant OFF-time calculation circuit, for calculating a constant ON-time or constant OFF-time; a logic circuit having inputs for receiving an output of the constant ON-time or constant OFF-time calculation circuit and a clock signal, respectively, wherein the clock signal has a frequency which is the desired fixed frequency; and a flip-flop for generating an output signal according to a set input and a reset input, wherein one of the set input and the reset input receives an output of the logic circuit, and the other one of the set input and the reset input receives a trigger signal which determines a start time of the ON-time or OFF-time.Type: ApplicationFiled: June 10, 2015Publication date: December 17, 2015Applicant: RICHTEK TECHNOLOGY CORPORATIONInventor: Ko-Cheng Wang
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Patent number: 8896319Abstract: A light emitting device control circuit controls a light emitting array which includes a plurality of light emitting device strings. Each light emitting device string includes a first terminal which is connected to a common node, a second terminal, and a plurality of light emitting devices connected in series. The light emitting device control circuit includes: a short detection circuit, coupled to the second terminals to receive second terminal signals from the second terminals, generating comparison signals according to whether the second terminal signals are higher than a reference signal, and generating a short detection signal according to whether a number of the comparison signals is between a first setting value and a second setting value.Type: GrantFiled: February 24, 2012Date of Patent: November 25, 2014Assignee: Richtek Technology CorporationInventors: Chia-Wei Liao, Ko-Cheng Wang
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Patent number: 8525505Abstract: A PWM controller and control method for a DC-DC voltage converter filter the high-frequency component of the voltage at the phase node between high-side and low-side elements of the voltage converter to generate a signal synchronous and in phase or out-of-phase with the inductor current of the voltage converter, to achieve a low-ripple output voltage and stable loop control.Type: GrantFiled: April 23, 2010Date of Patent: September 3, 2013Assignee: Richtek Technology Corp.Inventors: Ko-Cheng Wang, Kuo-Ping Liu, Chih-Wei Tseng
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Publication number: 20130221978Abstract: The present invention discloses a light emitting device control circuit and a short detection circuit. The light emitting device control circuit controls a light emitting array which includes a plurality of light emitting device strings. Each light emitting device string includes a first terminal which is connected to a common node, a second terminal, and a plurality of light emitting devices connected in series. The light emitting device control circuit includes: a short detection circuit, coupled to the second terminals to receive second terminal signals from the second terminals, generating comparison signals according to whether the second terminal signals are higher than a reference signal, and generating a short detection signal according to whether a number of the comparison signals is between a first setting value and a second setting value.Type: ApplicationFiled: February 24, 2012Publication date: August 29, 2013Inventors: Chia-Wei Liao, Ko-Cheng Wang
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Patent number: 8294443Abstract: A level-switching device is coupled to an output node of a PWM converter to switch the output voltage of the PWM converter between two levels by switching a MOS. An undershoot/overshoot eliminator is coupled to the MOS for the MOS changing from totally on state to totally off state or vice versa softly when switching the MOS. The feedback signal transition in the level-switching device becomes slower when switching the MOS to eliminate overshoot/undershoot on the output voltage.Type: GrantFiled: September 16, 2009Date of Patent: October 23, 2012Assignee: Richtek Technology Corp.Inventors: Chiao Chieh Chang, Ko-Cheng Wang
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Patent number: 8222876Abstract: The present invention discloses a power management chip with a dual function pin, the power management chip outputting pulse-width-modulation signals to control the switching of an up-gate transistor and a low-gate transistor for converting an input voltage to an output voltage, the up-gate and low-gate transistors being electrically connected to a node, the power management chip comprising: a dual function pin for electrically connecting with the input voltage or the node; a voltage sensing circuit electrically connected with the dual function pin for detecting the level of the input voltage; and a clock detection circuit electrically connected with the dual function pin for determining whether the signal received by the dual function pin is an oscillation signal.Type: GrantFiled: March 24, 2009Date of Patent: July 17, 2012Assignee: Richtek Technology CorporationInventor: Ko-Cheng Wang
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Patent number: 7834606Abstract: A control circuit provides a control signal for a constant on-time PWM switching converter to produce an output voltage, such that the converter operates with a constant on-time at a first state and operates with a variable on-time at a second state, so as to decrease the switching frequency and thereby the switching loss, to increase the efficiency of the converter, to improve the transient response, and to reduce the recovery time of the output voltage.Type: GrantFiled: August 2, 2007Date of Patent: November 16, 2010Assignee: Richtek Technology Corp.Inventors: Kuo-Ping Liu, Ko-Cheng Wang, Liang-Pin Tai, Chung-Sheng Cheng
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Publication number: 20100283441Abstract: A PWM controller and control method for a DC-DC voltage converter filter the high-frequency component of the voltage at the phase node between high-side and low-side elements of the voltage converter to generate a signal synchronous and in phase or out-of-phase with the inductor current of the voltage converter, to achieve a low-ripple output voltage and stable loop control.Type: ApplicationFiled: April 23, 2010Publication date: November 11, 2010Applicant: RICHTEK TECHNOLOGY CORP.Inventors: Ko-Cheng Wang, Kuo-Ping Liu, Chih-Wei Tseng
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Publication number: 20100072963Abstract: The present invention discloses a power management chip with a dual function pin, the power management chip outputting pulse-width-modulation signals to control the switching of an up-gate transistor and a low-gate transistor for converting an input voltage to an output voltage, the up-gate and low-gate transistors being electrically connected to a node, the power management chip comprising: a dual function pin for electrically connecting with the input voltage or the node; a voltage sensing circuit electrically connected with the dual function pin for detecting the level of the input voltage; and a clock detection circuit electrically connected with the dual function pin for determining whether the signal received by the dual function pin is an oscillation signal.Type: ApplicationFiled: March 24, 2009Publication date: March 25, 2010Inventor: Ko-Cheng Wang
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Publication number: 20100066331Abstract: A level-switching device is coupled to an output node of a PWM converter to switch the output voltage of the PWM converter between two levels by switching a MOS. An undershoot/overshoot eliminator is coupled to the MOS for the MOS changing from totally on state to totally off state or vice versa softly when switching the MOS. The feedback signal transition in the level-switching device becomes slower when switching the MOS to eliminate overshoot/undershoot on the output voltage.Type: ApplicationFiled: September 16, 2009Publication date: March 18, 2010Inventors: Chao Chieh Chang, Ko-Cheng Wang
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Patent number: 7576588Abstract: A quick turn on apparatus and method for a NMOSFET switch are used to maintain the gate voltage of the NMOSFET switch non-zero but not enough to turn on the NMOSFET switch, such that the NMOSFET switch turns on more quickly when it is to be turned on. Seamless transition can be further achieved in a single pole double throw switching circuit by using the quick turn on apparatus and method.Type: GrantFiled: August 3, 2006Date of Patent: August 18, 2009Assignee: Richtek Technology Corp.Inventors: Ko-Cheng Wang, Liang-Pin Tai
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Publication number: 20090174461Abstract: A quick turn on apparatus and method for a NMOSFET switch are used to maintain the gate voltage of the NMOSFET switch non-zero but not enough to turn on the NMOSFET switch, such that the NMOSFET switch turns on more quickly when it is to be turned on. Seamless transition can be further achieved in a single pole double throw switching circuit by using the quick turn on apparatus and method.Type: ApplicationFiled: March 12, 2009Publication date: July 9, 2009Inventors: Ko-Cheng Wang, Liang-Pin Tai
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Publication number: 20090039856Abstract: A DCR detecting circuit is parallel connected to the inductor of a self-clocking PWM buck converter which performs a trigger control of a PWM signal by an output feedback, to detect the current signal on the inductor to provide a large enough ripple to be combined into the output feedback, so as to enhance the system stability, while remains the small output ripple, without additional power loss.Type: ApplicationFiled: September 28, 2007Publication date: February 12, 2009Inventors: Ko-Cheng Wang, Liang-Pin Tai
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Publication number: 20080030181Abstract: A control circuit provides a control signal for a constant on-time PWM switching converter to produce an output voltage, such that the converter operates with a constant on-time at a first state and operates with a variable on-time at a second state, so as to decrease the switching frequency and thereby the switching loss, to increase the efficiency of the converter, to improve the transient response, and to reduce the recovery time of the output voltage.Type: ApplicationFiled: August 2, 2007Publication date: February 7, 2008Inventors: Kuo Ping Liu, Ko Cheng Wang, Liang Pin Tai, Chung Sheng Cheng
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Publication number: 20070046358Abstract: A quick turn on apparatus and method for a NMOSFET switch are used to maintain the gate voltage of the NMOSFET switch non-zero but not enough to turn on the NMOSFET switch, such that the NMOSFET switch turns on more quickly when it is to be turned on. Seamless transition can be further achieved in a single pole double throw switching circuit by using the quick turn on apparatus and method.Type: ApplicationFiled: August 3, 2006Publication date: March 1, 2007Inventors: Ko-Cheng Wang, Liang-Pin Tai
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Patent number: 6969980Abstract: A pulse width modulator includes an amplifier module, a comparator module, and a filter module. The amplifier module receives a feedback voltage signal from a passive network, and generates first and second non-inverted voltage signals and first and second inverted voltage signals in response to the feedback voltage signal. The comparator module receives the first and second non-inverted voltage signals and the first and second inverted voltage signals, and provides first and second differential voltage signals corresponding to the first and second non-inverted voltage signals and the first and second inverted voltage signals. The filter module is coupled between the amplifier module and the comparator module, and is operable so as to attenuate high frequency components of the first and second non-inverted voltage signals. As such, the presence of noise in the feedback voltage signal does not affect differential operation of the comparator module.Type: GrantFiled: May 21, 2004Date of Patent: November 29, 2005Assignee: Richtek Technology Corp.Inventors: Liang-Pin Tai, Kent Hwang, Jian-Rong Huang, Kuo-Ping Liu, Cheng-Hsuan Fan, Ko-Cheng Wang, Yu-Fan Liao
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Publication number: 20050258813Abstract: A pulse width modulator includes an amplifier module, a comparator module, and a filter module. The amplifier module receives a feedback voltage signal from a passive network, and generates first and second non-inverted voltage signals and first and second inverted voltage signals in response to the feedback voltage signal. The comparator module receives the first and second non-inverted voltage signals and the first and second inverted voltage signals, and provides first and second differential voltage signals corresponding to the first and second non-inverted voltage signals and the first and second inverted voltage signals. The filter module is coupled between the amplifier module and the comparator module, and is operable so as to attenuate high frequency components of the first and second non-inverted voltage signals. As such, the presence of noise in the feedback voltage signal does not affect differential operation of the comparator module.Type: ApplicationFiled: May 21, 2004Publication date: November 24, 2005Inventors: Liang-Pin Tai, Kent Hwang, Jian-Rong Huang, Kuo-Ping Liu, Cheng-Hsuan Fan, Ko-Cheng Wang, Yu-Fan Liao