Patents by Inventor Pei-Cheng Huang
Pei-Cheng Huang 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: 20240077804Abstract: A method includes forming a test pattern and a reference pattern in an absorption layer of a photomask structure. The test pattern has a first trench and a second trench, the reference pattern has a third trench and a fourth trench, the test pattern and the reference pattern have substantially the same dimension in a top view, and the second trench is deeper than the first trench, the third trench, and the fourth trench. The method further includes emitting a light beam to the test pattern to obtain a first interference pattern reflected from the test pattern, emitting the light beam to the reference pattern to obtain a second interference pattern reflected from the reference pattern; and comparing the first interference pattern with the second interference pattern to obtain a measured complex refractive index of the absorption layer.Type: ApplicationFiled: September 1, 2022Publication date: March 7, 2024Applicant: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.Inventors: Ping-Hsun LIN, Chien-Cheng CHEN, Shih Ju HUANG, Pei-Cheng HSU, Ta-Cheng LIEN, Hsin-Chang LEE
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Patent number: 10348112Abstract: A power management circuit is provided with groups of switches and a single shared inductor and is selectively configured in a first mode to act as a buck regulator and a second mode to act as a buck-boost regulator. There is a two-stage circuit topology, where both charging and regular operation of the device can be optimized. There is a switching charger integrated circuit that can be dedicated to performing a charging function, and there is a DC-DC power management integrated circuit that can be dedicated to regulating the system voltage provided by the battery while the battery is discharging.Type: GrantFiled: September 16, 2016Date of Patent: July 9, 2019Assignee: Dialog Semiconductor (UK) LimitedInventors: Alan Somerville, Pei-Cheng Huang
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Publication number: 20170085080Abstract: A power management circuit is provided with groups of switches and a single shared inductor and is selectively configured in a first mode to act as a buck regulator and a second mode to act as a buck-boost regulator. There is a two-stage circuit topology, where both charging and regular operation of the device can be optimised. There is a switching charger integrated circuit that can be dedicated to performing a charging function, and there is a DC-DC power management integrated circuit that can be dedicated to regulating the system voltage provided by the battery while the battery is discharging.Type: ApplicationFiled: September 16, 2016Publication date: March 23, 2017Inventors: Pei-Cheng Huang, Alan Somerville
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Patent number: 8912744Abstract: A method and apparatus for dynamically adjusting a dead time of a BLDC motor during a phase change detect the winding current of the BLDC motor during the dead time, and terminate the dead time when the winding current is detected to be substantially or close to zero. Thus, the method and apparatus can optimize the dead time and switch the BLDC motor between two phases at a zero-current point, without reducing the maximum rotation speed of the BLDC motor.Type: GrantFiled: August 9, 2012Date of Patent: December 16, 2014Assignee: Richtek Technology Corp.Inventors: Haó-Yu Chang, Pei-Cheng Huang, Wei-Hsu Chang, Kuo-Chung Lee
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Patent number: 8779690Abstract: The present invention discloses a direct current (DC) light emitting device control circuit with dimming function, and a method thereof, wherein the dimming function is provided in a feedback loop for feeding back a feedback signal from an output terminal to a power switch control circuit; the feedback signal relates to an output current supplied to the DC light emitting device. The present invention adjusts the feedback signal according to the desired brightness of the DC light emitting device. The present invention controls a power switch according to the adjusted feedback signal, such that the output current supplied to the DC light emitting device is adjusted, and accordingly the brightness of the DC light emitting device is adjusted below the full brightness.Type: GrantFiled: June 22, 2011Date of Patent: July 15, 2014Assignee: Richtek Technology Corporation, R.O.C.Inventors: Fu-Sheng Tsai, Pei-Cheng Huang
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Patent number: 8755539Abstract: An electrostatic transducer loudspeaker includes a filterless class-D amplifier to modulate an audio input signal to generate a modulated signal containing a PWM switching carrier component, and a transformer directly connected at an output side of the filterless class-D amplifier and directly connected at an input side of an electrostatic transducer, whereby the equivalent capacitance of the electrostatic transducer and the equivalent inductance of the transformer establish a resonance circuit to demodulate the modulated signal to generate an AC voltage to drive the electrostatic transducer.Type: GrantFiled: November 16, 2010Date of Patent: June 17, 2014Assignee: Richtek Technology Corp.Inventors: Pei-Cheng Huang, Jwin-Yen Guo
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Patent number: 8660276Abstract: A driving circuit for a sound outputting apparatus includes a H-bridge and a charge pump established by six switches for driving two types of loudspeakers, respectively. The six switches include two common switches to be configured in the H-bridge and the charge pump, thereby reducing the costs and circuit area of the driving circuit.Type: GrantFiled: December 1, 2011Date of Patent: February 25, 2014Assignee: Ricktek Technology Corp.Inventors: Chang-Chih Lin, Hung-Dar Wang, Pei-Cheng Huang
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Patent number: 8659539Abstract: A power-saving method adapted in a multi-mode display device is provided. The power-saving method comprises the steps as follows. A brightness of an ambient light is detected. When the brightness of the ambient light lies within a transmissive range, the multi-mode display device is operated in a transmissive mode and enables the backlight module of the multi-mode display. When the brightness of the ambient light lies within a transflective range, the multi-mode display device is operated in a transflective mode and the brightness of the backlight module is dynamically adjusted according to a compensation method. When the brightness of the ambient light lies within a reflective range, the multi-mode display device is operated in a reflective mode and turns off the backlight module.Type: GrantFiled: June 20, 2011Date of Patent: February 25, 2014Assignee: Quanta Computer Inc.Inventors: Chi-Ming Hung, Chih-Ming Ma, Pei-Cheng Huang, Jun-Lin Huang
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Patent number: 8513894Abstract: The present invention discloses a light emitting device control method for adjusting the brightness of the light emitting device by an AC signal, comprising: receiving a signal having a turn ON angle and converting the signal to a DC signal; obtaining an average of the DC signal level, the average being a function of the turn ON angle; determining a reference voltage of a current source circuit according to the average of the DC signal level; and controlling a current flow through the light emitting device by the current source circuit.Type: GrantFiled: September 1, 2009Date of Patent: August 20, 2013Assignee: Richtek Technology Corporation, R.O.C.Inventors: Pei-Cheng Huang, Ching-Jung Tseng, Jing-Meng Liu
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Patent number: 8487571Abstract: A zero-crossing detection circuit and a commutation device using the zero-crossing detection circuit are provided. The zero-crossing detection circuit is adapted into a three-phase brushless DC (direct current) motor with first to third coils. One terminal of each of the first to third coils is electrically coupled together with each other. The detection circuit comprises a first selection circuit, a second selection circuit and a comparator. The first selection circuit and the second selection circuit are both electrically coupled to another terminals of the first to third coils, to obtain first to third terminal voltages, and output one of the first to third terminal voltages according to a selection signal. The comparator is configured for comparing an output of the first selection circuit and an output of the second selection circuit, to output a comparing result.Type: GrantFiled: September 14, 2011Date of Patent: July 16, 2013Assignee: Richtek Technology Corp.Inventors: Wei-Hsu Chang, Pei-Cheng Huang, Hao-Yu Chang, Yen-Shin Lai, Kuo-Chung Lee, Jo-Yu Wang, Yu-Kuang Wu, Chih-Chang Chen, Shiue-Shr Jiang, Jen-Hung Chi
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Patent number: 8456094Abstract: The present invention discloses a light emitting device open/short detection circuit, which is used for detecting at least one light emitting device string open/short. Each light emitting device string has a first end and a second end, wherein the first end is coupled to a voltage supply circuit to supply electrical power to the light emitting devices. The open/short detection circuit includes: an abnormal voltage detection circuit coupled to the light emitting device strings for receiving voltages of the second ends respectively and generating an abnormal voltage detection signal; a voltage setting circuit coupled to the abnormal voltage detection circuit for setting an abnormal reference level; and a determination circuit coupled to the voltage setting circuit. When the abnormal voltage detection signal is equal to or over the abnormal reference level, the determination circuit generates an open/short detection signal for an abnormal condition detected.Type: GrantFiled: July 29, 2011Date of Patent: June 4, 2013Assignee: Richtek Technology CorporationInventors: Pei-Cheng Huang, Kuo-Chi Liu, Ming-Hsueh Lee, Shih-Hua Chien, Chao-Hua Wu
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Patent number: 8450948Abstract: By monitoring the temperature of an LED and the temperature of a controller chip for the LED, a thermal foldback control is employed to gradually decrease the driving current of the LED before the LED or the controller chip is over heated, so as to prevent an over temperature protection from being triggered to shutdown the controller chip to cause the LED to undesirably flicker.Type: GrantFiled: December 23, 2010Date of Patent: May 28, 2013Assignee: Richtek Technology Corp.Inventors: Pei-Cheng Huang, Jing-Meng Liu
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Patent number: 8400072Abstract: The present invention discloses a light emitting device driver circuit and a method for driving a light emitting device. In the present invention, the secondary windings of a transformer provide positive and negative secondary voltages, so as to generate positive and negative output voltages. A light emitting device circuit is coupled between the positive and negative output voltages. As such, the specification to withstand high voltage for a device in the circuit is reduced.Type: GrantFiled: November 9, 2010Date of Patent: March 19, 2013Assignee: Richtek Technology Corporation, R.O.C.Inventors: Pei-Cheng Huang, Jing-Meng Liu, Roland Van Roy
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Publication number: 20130038260Abstract: A method and apparatus for dynamically adjusting a dead time of a BLDC motor during a phase change detect the winding current of the BLDC motor during the dead time, and terminate the dead time when the winding current is detected to be substantially or close to zero. Thus, the method and apparatus can optimize the dead time and switch the BLDC motor between two phases at a zero-current point, without reducing the maximum rotation speed of the BLDC motor.Type: ApplicationFiled: August 9, 2012Publication date: February 14, 2013Applicant: RICHTEK TECHNOLOGY CORPORATIONInventors: Haó-Yu CHANG, Pei-Cheng HUANG, Wei-Hsu CHANG, Kuo-Chung LEE
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Publication number: 20120326647Abstract: A zero-crossing detection circuit and a commutation device using the zero-crossing detection circuit are provided. The zero-crossing detection circuit is adapted into a three-phase brushless DC (direct current) motor with first to third coils. One terminal of each of the first to third coils is electrically coupled together with each other. The detection circuit comprises a first selection circuit, a second selection circuit and a comparator. The first selection circuit and the second selection circuit are both electrically coupled to another terminals of the first to third coils, to obtain first to third terminal voltages, and output one of the first to third terminal voltages according to a selection signal. The comparator is configured for comparing an output of the first selection circuit and an output of the second selection circuit, to output a comparing result.Type: ApplicationFiled: September 14, 2011Publication date: December 27, 2012Applicant: RICHTEK TECHNOLOGY CORPInventors: Wei-Hsu Chang, Pei-Cheng Huang, Hao-Yu Chang, Yen-Shin Lai, Kuo-Chung Lee, Jo-Yu Wang, Yu-Kuang Wu, Chih-Chang Chen, Shiue-Shr Jiang, Jen-Hung Chi
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Publication number: 20120293082Abstract: The present invention discloses a light emitting device open/short detection circuit, which is used for detecting at least one light emitting device string open/short. Each light emitting device string has a first end and a second end, wherein the first end is coupled to a voltage supply circuit to supply electrical power to the light emitting devices. The open/short detection circuit includes: an abnormal voltage detection circuit coupled to the light emitting device strings for receiving voltages of the second ends respectively and generating an abnormal voltage detection signal; a voltage setting circuit coupled to the abnormal voltage detection circuit for setting an abnormal reference level; and a determination circuit coupled to the voltage setting circuit. When the abnormal voltage detection signal is equal to or over the abnormal reference level, the determination circuit generates an open/short detection signal for an abnormal condition detected.Type: ApplicationFiled: July 29, 2011Publication date: November 22, 2012Inventors: Pei-Cheng Huang, Kuo-Chi Liu, Ming-Hsueh Lee, Shih-Hua Chien, Chao-Hua Wu
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Publication number: 20120256892Abstract: A power-saving method adapted in a multi-mode display device is provided. The power-saving method comprises the steps as follows. A brightness of an ambient light is detected. When the brightness of the ambient light lies within a transmissive range, the multi-mode display device is operated in a transmissive mode and enables the backlight module of the multi-mode display. When the brightness of the ambient light lies within a transflective range, the multi-mode display device is operated in a transflective mode and the brightness of the backlight module is dynamically adjusted according to a compensation method. When the brightness of the ambient light lies within a reflective range, the multi-mode display device is operated in a reflective mode and turns off the backlight module.Type: ApplicationFiled: June 20, 2011Publication date: October 11, 2012Applicant: Quanta Computer Inc.Inventors: Chi-Ming HUNG, Chih-Ming Ma, Pei-Cheng Huang, Jun-Lin Huang
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Publication number: 20120140958Abstract: A driving circuit for a sound outputting apparatus includes a H-bridge and a charge pump established by six switches for driving two types of loudspeakers, respectively. The six switches include two common switches to be configured in the H-bridge and the charge pump, thereby reducing the costs and circuit area of the driving circuit.Type: ApplicationFiled: December 1, 2011Publication date: June 7, 2012Applicant: RICHTEK TECHNOLOGY CORP.Inventors: Chang-Chih LIN, Hung-Dar WANG, Pei-Cheng HUANG
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Patent number: 8115542Abstract: A class-D amplifier includes a ramp generator to provide a ramp signal having a frequency varying with an audio input signal, and a modulator to convert the audio input signal to a pulse width modulation signal according to the ramp signal for a driver to drive a load device. The varying frequency of the ramp signal will cause the frequency of the pulse width modulation signal unfixed and consequently improves EMI issue.Type: GrantFiled: August 17, 2010Date of Patent: February 14, 2012Assignee: Richtek Technology Corp.Inventors: Pei-Cheng Huang, Jwin-Yen Guo, Shao-Ming Sun
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Patent number: 8064620Abstract: The present invention discloses a driver circuit for an electrostatic loudspeaker, comprising: a digital modulation encoder for receiving a digital audio signal and a fixed frequency pulse signal, and mixing them by modulation; a digital to analog converter for converting the output of the digital modulation encoder to an analog signal; a transformer for adjusting the voltage amplitude of the analog signal; and a demodulator for demodulating the adjusted analog signal to driver a speaker.Type: GrantFiled: August 22, 2008Date of Patent: November 22, 2011Assignee: Richtek Technology Corporation, R.O.C.Inventors: Pei-Cheng Huang, Jwin-Yen Guo, Kuo-Chi Liu