Patents by Inventor Hsiang-Chung Chang
Hsiang-Chung Chang 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: 20240282628Abstract: A method of forming a semiconductor structure includes forming a seed layer on a substrate, forming a photoresist layer on the seed layer with a first opening wider than a second opening, performing an electroplating process with a first plating current to grow a bottom portion of a first metal line in the first opening and a bottom portion of a second metal line in the second opening, continuing the electroplating process with a second plating current that is larger than the first plating current to grow a top portion of the first metal line and a top portion of the second metal line, removing the photoresist layer to expose a portion of the seed layer, and removing the exposed portion of the seed layer.Type: ApplicationFiled: July 25, 2023Publication date: August 22, 2024Inventors: Dian-Hau CHEN, Chen-Chiu HUANG, Hsiang-Ku SHEN, ShuFang CHEN, Ying-Yao LAI, Wen-Ling CHANG, Chi-Feng LIN, Peng-Chung JANGJIAN, Jo-Lin LAN, Fang-I Chih
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Patent number: 11482936Abstract: A signal transmission circuit is configured for transmitting control information from a secondary side of a power converter to a primary side of the power converter. The signal transmission circuit includes a transmitter circuit, a signal transformer and a detection circuit. The transmitter circuit is configured to generate a ramp signal at least according to a first control signal outputted from the secondary side. The first control signal indicates the control information provided for a switch in the primary side. The signal transformer, coupled to the transmitter circuit, is configured to convert the ramp signal to generate an output signal. The output signal includes a positive-going component and a negative-going component to indicate the control information. The detection circuit, coupled to the signal transformer, is configured to detect the positive-going component and the negative-going component to provide the control information for the switch.Type: GrantFiled: April 30, 2020Date of Patent: October 25, 2022Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Hung-Ta Hsu, Hsiang-Chung Chang, Yueh-Ping Yu, Tien-Chi Lin
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Patent number: 11431252Abstract: A flyback converter, including: a transformer, a first switch, a second switch, and a control circuit. The transformer includes a first side and a second side. The first switch is coupled to the first side at an input terminal. The second switch is coupled to the second side and an output terminal. The control circuit is coupled between the output terminal and the second switch, wherein the control circuit is arranged to adjust a voltage on the input terminal by changing a flow of a current between the second switch and the second side.Type: GrantFiled: May 22, 2020Date of Patent: August 30, 2022Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Guan-Yu Lin, Yu-Ming Chen, Jung-Pei Cheng, Tien-Chi Lin, Hsiang-Chung Chang, Yueh-Ping Yu
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Patent number: 11387738Abstract: When a constant on-time flyback converter is in the switch-on stage, the gate voltage of the switch and the input voltage of the flyback converter adopt the primary side of the transformer to control. The gate voltage is controlled by the second control signal generated by the controller. The flyback converter is then turn off to enter the switch off stage. When the flyback converter is in the switch off stage, the secondary side controller on the secondary side of the transformer, based on the output voltage and output current of the secondary side, sends a first control signal to the primary side controller to control the main switch to turn on. Thus, the flyback converter enters the switch-on stage. Therefore, the calculation complexity is reduced, and there is no need to set a blanking time, such that the flyback converter can be used in high switching frequency applications.Type: GrantFiled: September 9, 2020Date of Patent: July 12, 2022Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Jung-Pei Cheng, Hung-Ta Hsu, Hsiang-Chung Chang, Yueh-Ping Yu, Yu-Ming Chen
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Patent number: 11336185Abstract: A flyback converter includes a transformer, a sensing impedance, a switch and a control circuit. The sensing impedance is coupled between the transformer and an output terminal of the flyback converter. The switch is coupled to the transformer. The transformer is charged when the switch activates. The transformer is discharged when the switch deactivates. The control circuit is arranged to detect if the sensing impedance is bypassed, and further arranged to adjust an operating frequency of the switch when the sensing impedance is bypassed.Type: GrantFiled: May 11, 2020Date of Patent: May 17, 2022Assignee: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Guan-Yu Lin, Yu-Ming Chen, Tien-Chi Lin, Tin-Wei Chen, Hsiang-Chung Chang, Yueh-Ping Yu
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Patent number: 11221658Abstract: A multi-port power delivery system includes a first universal serial bus (USB) port, a second USB port, a first power conversion unit, a second power conversion unit, a power delivery control circuit and a switch circuit. The first USB port is configured to output power delivered to a first power path. The second USB port is configured to output power delivered to a second power path. The first power conversion unit has a first output terminal coupled to the first power path. The second power conversion unit has a second output terminal coupled to the second power path. The power delivery control circuit generates a switch control signal according to first connection information on the first USB port and second connection information on the second USB port. The switch circuit selectively couples the first output terminal to the second output terminal according to the switch control signal.Type: GrantFiled: January 16, 2020Date of Patent: January 11, 2022Assignee: ALPHA AND OMEGA SEMICONDUCTOR (CAYMAN), LTD.Inventors: Pao-Yao Yeh, Yu-Ming Chen, Jung-Pei Cheng, Hsiang-Chung Chang
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Publication number: 20210367523Abstract: A flyback converter, including: a transformer, a first switch, a second switch, and a control circuit. The transformer includes a first side and a second side. The first switch is coupled to the first side at an input terminal. The second switch is coupled to the second side and an output terminal. The control circuit is coupled between the output terminal and the second switch, wherein the control circuit is arranged to adjust a voltage on the input terminal by changing a flow of a current between the second switch and the second side.Type: ApplicationFiled: May 22, 2020Publication date: November 25, 2021Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Guan-Yu Lin, Yu-Ming Chen, Jung-Pei Cheng, Tien-Chi Lin, Hsiang-Chung Chang, Yueh-Ping Yu
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Publication number: 20210351702Abstract: A flyback converter includes a transformer, a sensing impedance, a switch and a control circuit. The sensing impedance is coupled between the transformer and an output terminal of the flyback converter. The switch is coupled to the transformer. The transformer is charged when the switch activates. The transformer is discharged when the switch deactivates. The control circuit is arranged to detect if the sensing impedance is bypassed, and further arranged to adjust an operating frequency of the switch when the sensing impedance is bypassed.Type: ApplicationFiled: May 11, 2020Publication date: November 11, 2021Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Guan-Yu Lin, Yu-Ming Chen, Tien-Chi Lin, Tin-Wei Chen, Hsiang-Chung Chang, Yueh-Ping Yu
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Patent number: 11170926Abstract: An isolation coupling structure for transmitting a feedback signal between a secondary side and a primary side of a voltage conversion device includes a first dielectric layer including a first face and a second face opposite to the first face, a first coupling coil disposed on the first face enclosing to form an inner region; a second coupling coil configured to couple with the first coupling coil. The second coupling coil includes a first coil portion and a second coil portion, where the first coil portion is disposed on the second face, the second coil portion is disposed on the first face and located inside the inner region. The second coil portion is isolated from the first coupling coil, and the first coil portion and the second coil portion are electrically connected. The technical effect is that it can realize the electrical isolation and the coupling with low cost and small package size.Type: GrantFiled: February 2, 2018Date of Patent: November 9, 2021Assignee: ALPHA AND OMEGA SEMICONDUCTOR (CAYMAN) LTD.Inventors: Jung-Pei Cheng, Hsiang-Chung Chang, Yu-Ming Chen, Chieh-Wen Cheng, Tsung-Han Ou, Lih-Ming Doong
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Publication number: 20210344273Abstract: A signal transmission circuit is configured for transmitting control information from a secondary side of a power converter to a primary side of the power converter. The signal transmission circuit includes a transmitter circuit, a signal transformer and a detection circuit. The transmitter circuit is configured to generate a ramp signal at least according to a first control signal outputted from the secondary side. The first control signal indicates the control information provided for a switch in the primary side. The signal transformer, coupled to the transmitter circuit, is configured to convert the ramp signal to generate an output signal. The output signal includes a positive-going component and a negative-going component to indicate the control information. The detection circuit, coupled to the signal transformer, is configured to detect the positive-going component and the negative-going component to provide the control information for the switch.Type: ApplicationFiled: April 30, 2020Publication date: November 4, 2021Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Hung-Ta Hsu, Hsiang-Chung Chang, Yueh-Ping Yu, Tien-Chi Lin
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Publication number: 20210257916Abstract: When a constant on-time flyback converter is in the switch-on stage, the gate voltage of the switch and the input voltage of the flyback converter adopt the primary side of the transformer to control. The gate voltage is controlled by the second control signal generated by the controller. The flyback converter is then turn off to enter the switch off stage. When the flyback converter is in the switch off stage, the secondary side controller on the secondary side of the transformer, based on the output voltage and output current of the secondary side, sends a first control signal to the primary side controller to control the main switch to turn on. Thus, the flyback converter enters the switch-on stage. Therefore, the calculation complexity is reduced, and there is no need to set a blanking time, such that the flyback converter can be used in high switching frequency applications.Type: ApplicationFiled: September 9, 2020Publication date: August 19, 2021Applicant: ALPHA AND OMEGA SEMICONDUCTOR INTERNATIONAL LPInventors: Jung-Pei Cheng, Hung-Ta Hsu, Hsiang-Chung Chang, Yueh-Ping Yu, Yu-Ming Chen
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Publication number: 20210223838Abstract: A multi-port power delivery system includes a first universal serial bus (USB) port, a second USB port, a first power conversion unit, a second power conversion unit, a power delivery control circuit and a switch circuit. The first USB port is configured to output power delivered to a first power path. The second USB port is configured to output power delivered to a second power path. The first power conversion unit has a first output terminal coupled to the first power path. The second power conversion unit has a second output terminal coupled to the second power path. The power delivery control circuit generates a switch control signal according to first connection information on the first USB port and second connection information on the second USB port. The switch circuit selectively couples the first output terminal to the second output terminal according to the switch control signal.Type: ApplicationFiled: January 16, 2020Publication date: July 22, 2021Applicant: Alpha and Omega Semiconductor (Cayman) Ltd.Inventors: Pao-Yao Yeh, Yu-Ming Chen, Jung-Pei Cheng, Hsiang-Chung Chang
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Publication number: 20190172621Abstract: An isolation coupling structure for transmitting a feedback signal between a secondary side and a primary side of a voltage conversion device includes a first dielectric layer including a first face and a second face opposite to the first face, a first coupling coil disposed on the first face enclosing to form an inner region; a second coupling coil configured to couple with the first coupling coil. The second coupling coil includes a first coil portion and a second coil portion, where the first coil portion is disposed on the second face, the second coil portion is disposed on the first face and located inside the inner region. The second coil portion is isolated from the first coupling coil, and the first coil portion and the second coil portion are electrically connected. The technical effect is that it can realize the electrical isolation and the coupling with low cost and small package size.Type: ApplicationFiled: February 2, 2018Publication date: June 6, 2019Applicant: Alpha and Omega Semiconductor (Cayman) Ltd.Inventors: Jung-Pei Cheng, Hsiang-Chung Chang, Yu-Ming Chen, Chieh-Wen Cheng, Tsung-Han Ou, Lih-Ming Doong
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Patent number: 9350241Abstract: The present disclosure provides a pair of NMOSFET switches connected in series, an output filter, a control circuit, a boot-strap capacitor and a disabling circuit. A high-side MOSFET switch is coupled to an input voltage. A low-side MOSFET switch is coupled to a ground. The high-side MOSFET switch and the low-side MOSFET switch have complementary duty cycles. The output filter is coupled to the NMOSFET switches to provide an output voltage. The boot-strap capacitor is coupled to the source of the high-side MOSFET switch. The voltage crossing the boot-trap capacitor is for making the gate voltage of the high-side MOSFET switch to be higher than the input voltage. The disabling circuit senses the voltage crossing the boot-strap capacitor, and generates a control signal to control the control circuit for continuously turning off the high-side MOSFET switch when the voltage crossing the boot-strap capacitor is less than a threshold voltage.Type: GrantFiled: April 17, 2014Date of Patent: May 24, 2016Assignee: ANPEC ELECTRONICS CORPORATIONInventors: Hsiang-Chung Chang, Dong-Yi Liu, Yu-Yu Chen
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Patent number: 9350158Abstract: An over-current protection circuit and a pulse width modulator having the same are provided. The pulse width module includes a high-side switch, a low-side switch, and a driving module. The driving module controls the high-side switch and the low-side switch according to a set signal and a reset signal periodically to adjust an inductive current flowing through the high-side switch and the low-side switch. When inductive current is the overcurrent during the minimum on time of the high-side switch, the over-current protection circuit turns off the high-side switch in a predefined time to decrease the inductive current continuously, so that the average current of the inductive current does not become too high to damage the pulse width module.Type: GrantFiled: June 28, 2014Date of Patent: May 24, 2016Assignee: ANPEC ELECTRONICS CORPORATIONInventors: Chih-Yuan Chen, Hsiang-Chung Chang
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Publication number: 20150288166Abstract: An over-current protection circuit and a pulse width modulator having the same are provided. The pulse width module includes a high-side switch, a low-side switch, and a driving module. The driving module controls the high-side switch and the low-side switch according to a set signal and a reset signal periodically to adjust an inductive current flowing through the high-side switch and the low-side switch. When inductive current is the overcurrent during the minimum on time of the high-side switch, the over-current protection circuit turns off the high-side switch in a predefined time to decrease the inductive current continuously, so that the average current of the inductive current does not become too high to damage the pulse width module.Type: ApplicationFiled: June 28, 2014Publication date: October 8, 2015Inventors: CHIH-YUAN CHEN, HSIANG-CHUNG CHANG
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Publication number: 20150188425Abstract: The present disclosure provides a pair of NMOSFET switches connected in series, an output filter, a control circuit, a boot-strap capacitor and a disabling circuit. A high-side MOSFET switch is coupled to an input voltage. A low-side MOSFET switch is coupled to a ground. The high-side MOSFET switch and the low-side MOSFET switch have complementary duty cycles. The output filter is coupled to the NMOSFET switches to provide an output voltage. The boot-strap capacitor is coupled to the source of the high-side MOSFET switch. The voltage crossing the boot-trap capacitor is for making the gate voltage of the high-side MOSFET switch to be higher than the input voltage. The disabling circuit senses the voltage crossing the boot-strap capacitor, and generates a control signal to control the control circuit for continuously turning off the high-side MOSFET switch when the voltage crossing the boot-strap capacitor is less than a threshold voltage.Type: ApplicationFiled: April 17, 2014Publication date: July 2, 2015Applicant: ANPEC ELECTRONICS CORPORATIONInventors: HSIANG-CHUNG CHANG, DONG-YI LIU, YU-YU CHEN
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Patent number: 9048675Abstract: A charging circuit for a capacitor includes a current mirror module including a first branch circuit, a second branch circuit and a third branch circuit for supplying a plurality of output currents respectively, a switching module coupled to the first branch circuit and the second branch circuit for determining a conducting condition of the switching module according to the plurality of output currents from the first branch circuit and the second branch circuit, and an active loading circuit coupled to the third branch circuit and the switching module for adjusting a current passing through the active loading circuit according to the conducting condition of the switching module. The capacitor has one end coupled to the first branch circuit and the switching module to process a charging operation according to the output current of the first branch circuit.Type: GrantFiled: March 1, 2012Date of Patent: June 2, 2015Assignee: Anpec Electronics CorporationInventors: Tse-Lung Yang, Hsiang-Chung Chang
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Patent number: 8901907Abstract: A current-limit system for limiting an average current of an output signal of a DC-DC converter includes a current sensing device, coupled to the DC-DC converter, for detecting the average current of the output signal of the DC-DC converter; and a current-to-voltage converting module, coupled to the current sensing device, for converting the average current into a clamp voltage, in order to control the DC-DC converter according to the clamp voltage.Type: GrantFiled: January 1, 2013Date of Patent: December 2, 2014Assignee: Anpec Electronics CorporationInventors: Tse-Lung Yang, Hsiang-Chung Chang
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Patent number: 8823350Abstract: A switching regulator for outputting an output voltage is disclosed. The switching regulator includes an upper gate switch, for turning on and turning off according to an upper gate control signal; a lower gate switch, coupled to the upper gate switch, for turning on and turning off according to a lower gate control signal; and a logic circuit, for generating the lower gate control signal according to a lower gate off signal. The lower gate switch turns off during an activation period of the switching regulator.Type: GrantFiled: November 11, 2012Date of Patent: September 2, 2014Assignee: Anpec Electronics CorporationInventors: Hung-Ta Hsu, Hsiang-Chung Chang