Patents by Inventor Chia-Yo Yeh
Chia-Yo Yeh 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: 9379622Abstract: A control circuit and a method for controlling a power converter are provided. The method for controlling the power converter includes the following steps. A detection signal is received from the secondary side of the power transformer and a first switching signal is generated in accordance with the detection signal. A second switching signal is generated in accordance with the first switching signal. A voltage signal is generated in accordance with the second switching signal. A comparison signal is generated in accordance with the first switching signal and the second switching signal. The voltage signal and the comparison signal are compared for outputting a comparison result. A gate signal is generated in accordance with the detection signal and the comparison result to control on and off states of a synchronization switch.Type: GrantFiled: July 3, 2013Date of Patent: June 28, 2016Assignee: Fairchild (Taiwan) CorporationInventors: Chou-Sheng Wang, Chia-Yo Yeh, Rui-Hong Lu, Jhih-Da Hsu, Ying-Chieh Su
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Publication number: 20140009976Abstract: A control circuit and a method for controlling a power converter are provided. The method for controlling the power converter includes the following steps. A detection signal is received from the secondary side of the power transformer and a first switching signal is generated in accordance with the detection signal. A second switching signal is generated in accordance with the first switching signal. A voltage signal is generated in accordance with the second switching signal. A comparison signal is generated in accordance with the first switching signal and the second switching signal. The voltage signal and the comparison signal are compared for outputting a comparison result. A gate signal is generated in accordance with the detection signal and the comparison result to control on and off states of a synchronization switch.Type: ApplicationFiled: July 3, 2013Publication date: January 9, 2014Applicant: SYSTEM GENERAL CORP.Inventors: Chou-Sheng Wang, Chia-Yo Yeh, Rui-Hong Lu, Jhih-Da Hsu, Ying-Chieh Su
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Patent number: 8625313Abstract: A control circuit for a switching power converter is provided. The control circuit is installed between a secondary side and an output of the power converter and coupled to control a switching device. The control circuit includes a linear predict circuit, a reset circuit, a charge/discharge circuit, and a PWM circuit. The linear predict circuit is coupled to receive a linear predict signal from the secondary side for generating a charging signal. The reset circuit is couple to receive a resetting signal for generating a discharging signal. The charge/discharge circuit is coupled to receive the charging signal and the discharging signal for generating a ramp signal. The PWM circuit is coupled to receive the linear predict signal for enabling a switching signal and receive the ramp signal for resetting the switching signal.Type: GrantFiled: May 20, 2011Date of Patent: January 7, 2014Assignee: System General CorporationInventors: Chia-Yo Yeh, Jhih-Da Hsu, Ying-Chieh Su, Chien-Chun Huang, Chou-Sheng Wang
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Patent number: 8542507Abstract: An adaptive synchronous rectification control circuit and a control method are developed. The control circuit comprises an adaptive circuit that generates a reference signal in response to a detection signal of a power converter. A clamped circuit clamps the reference signal at a threshold voltage if the reference signal equals or is greater than the threshold voltage. A switching circuit generates a control signal to control a synchronous switch of the power converter in response to the detection signal and the reference signal. The control method generates the reference signal in response to the detection signal. The reference signal is clamped at the threshold voltage if the reference signal equals or is greater than the threshold voltage. The method further generates the control signal to control the synchronous switch of the power converter in response to the detection signal and the reference signal.Type: GrantFiled: March 23, 2011Date of Patent: September 24, 2013Assignee: System General Corp.Inventors: Jhih-Da Hsu, Chia-Yo Yeh, Chou-Sheng Wang, Ying-Chieh Su, Rui-Hong Lu
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Patent number: 8482937Abstract: A switching control circuit for a switching power converter is provided. The switching control circuit is coupled to a switching device and an auxiliary winding of a transformer. The switching control circuit includes a valley detecting circuit, a valley lock circuit, and a PWM circuit. The valley detecting circuit is coupled to receive a reflected voltage signal from the auxiliary winding of the transformer for outputting a control signal in response to the reflected voltage signal. The valley lock circuit is coupled to receive the control signal for outputting a judging signal in response to the control signal during a first period and a second period following the first period. The PWM circuit outputs a switching signal in response to the judging signal.Type: GrantFiled: December 8, 2010Date of Patent: July 9, 2013Assignee: System General CorporationInventors: Chao-Chih Lin, Ying-Chieh Su, Jhih-Da Hsu, Chia-Yo Yeh, Wei-Ting Wang
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Publication number: 20120033460Abstract: A control circuit for a switching power converter is provided. The control circuit is installed between a secondary side and an output of the power converter and coupled to control a switching device. The control circuit includes a linear predict circuit, a reset circuit, a charge/discharge circuit, and a PWM circuit. The linear predict circuit is coupled to receive a linear predict signal from the secondary side for generating a charging signal. The reset circuit is couple to receive a resetting signal for generating a discharging signal. The charge/discharge circuit is coupled to receive the charging signal and the discharging signal for generating a ramp signal. The PWM circuit is coupled to receive the linear predict signal for enabling a switching signal and receive the ramp signal for resetting the switching signal.Type: ApplicationFiled: May 20, 2011Publication date: February 9, 2012Applicant: SYSTEM GENERAL CORPORATIONInventors: Chia-Yo Yeh, Jhih-Da Hsu, Ying-Chieh Su, Chien-Chun Huang, Chou-Sheng Wang
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Publication number: 20110305053Abstract: A switching control circuit for a switching power converter is provided. The switching control circuit is coupled to a switching device and an auxiliary winding of a transformer. The switching control circuit includes a valley detecting circuit, a valley lock circuit, and a PWM circuit. The valley detecting circuit is coupled to receive a reflected voltage signal from the auxiliary winding of the transformer for outputting a control signal in response to the reflected voltage signal. The valley lock circuit is coupled to receive the control signal for outputting a judging signal in response to the control signal during a first period and a second period following the first period. The PWM circuit outputs a switching signal in response to the judging signal.Type: ApplicationFiled: December 8, 2010Publication date: December 15, 2011Applicant: SYSTEM GENERAL CORPORATIONInventors: Chao-Chih Lin, Ying-Chieh Su, Jhih-Da Hsu, Chia-Yo Yeh, Wei-Ting Wang
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Publication number: 20110305055Abstract: An adaptive synchronous rectification control circuit and a control method are developed. The control circuit comprises an adaptive circuit that generates a reference signal in response to a detection signal of a power converter. A clamped circuit clamps the reference signal at a threshold voltage if the reference signal equals or is greater than the threshold voltage. A switching circuit generates a control signal to control a synchronous switch of the power converter in response to the detection signal and the reference signal. The control method generates the reference signal in response to the detection signal. The reference signal is clamped at the threshold voltage if the reference signal equals or is greater than the threshold voltage. The method further generates the control signal to control the synchronous switch of the power converter in response to the detection signal and the reference signal.Type: ApplicationFiled: March 23, 2011Publication date: December 15, 2011Applicant: SYSTEM GENERAL CORP.Inventors: JHIH-DA HSU, CHIA-YO YEH, CHOU-SHENG WANG, YING-CHIEH SU, RUI-HONG LU