Patents by Inventor Fong-Cheng Yang
Fong-Cheng Yang 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: 11742742Abstract: A constant-current control device for a power supply including a primary side switch and a secondary winding includes a voltage waveform detector, configured to generate a discharging period signal within a time length when the secondary winding is discharging according to a first feedback voltage and a control voltage; and a constant-current controller, wherein an integrator of the constant-current controller is configured to receive one of a first current source and a second current source according to the discharging period signal and a current detecting voltage to generate an integrator result voltage, wherein the current detecting voltage is related to a secondary winding current value flowing through the secondary winding and the secondary winding current value is positively related to a secondary output current value of the power supply.Type: GrantFiled: November 22, 2021Date of Patent: August 29, 2023Assignee: Ark Semiconductor Corp. Ltd.Inventors: Fong-Cheng Yang, Yi-Jung Tu
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Patent number: 11532992Abstract: A synchronous rectifier controller for controlling a rectifier switch is disclosed. The synchronous rectifier controller includes a fully-ON controller and a regulator. Capable of being triggered by a channel voltage of the rectifier switch, the fully-ON controller turns the rectifier switch fully ON for a fully-ON time in view of a predetermined condition. The regulator, disabled during the fully-ON time and enabled after the fully-ON time, turns the rectifier switch ON to regulate the channel voltage within a predetermined voltage range.Type: GrantFiled: March 19, 2021Date of Patent: December 20, 2022Assignee: ARK SEMICONDUCTOR CORP. LTD.Inventors: Yi-Lun Shen, Yu-Yun Huang, Fong-Cheng Yang
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Publication number: 20220190707Abstract: A constant-current control device for a power supply including a primary side switch and a secondary winding includes a voltage waveform detector, configured to generate a discharging period signal within a time length when the secondary winding is discharging according to a first feedback voltage and a control voltage; and a constant-current controller, wherein an integrator of the constant-current controller is configured to receive one of a first current source and a second current source according to the discharging period signal and a current detecting voltage to generate an integrator result voltage, wherein the current detecting voltage is related to a secondary winding current value flowing through the secondary winding and the secondary winding current value is positively related to a secondary output current value of the power supply.Type: ApplicationFiled: November 22, 2021Publication date: June 16, 2022Applicant: Ark Semiconductor Corp. Ltd.Inventors: Fong-Cheng Yang, Yi-Jung Tu
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Publication number: 20210336546Abstract: A synchronous rectifier controller for controlling a rectifier switch is disclosed. The synchronous rectifier controller includes a fully-ON controller and a regulator. Capable of being triggered by a channel voltage of the rectifier switch, the fully-ON controller turns the rectifier switch fully ON for a fully-ON time in view of a predetermined condition. The regulator, disabled during the fully-ON time and enabled after the fully-ON time, turns the rectifier switch ON to regulate the channel voltage within a predetermined voltage range.Type: ApplicationFiled: March 19, 2021Publication date: October 28, 2021Inventors: Yi-Lun SHEN, Yu-Yun HUANG, Fong-Cheng YANG
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Patent number: 11152862Abstract: Disclosure includes a control method in use of a switching-mode power supply that supplies an output voltage to a load. A line voltage generated by rectifying an alternating-current voltage is detected to compare with a first reference voltage. A control signal is generated in response to the comparison of the line voltage and the first reference voltage. When the line voltage is less than the first reference voltage, the control signal is used to increase converted power that the switching-mode power supply provides to the output voltage. When the line voltage is not less than the first reference voltage, the control signal has no influence to the converted power.Type: GrantFiled: July 2, 2019Date of Patent: October 19, 2021Assignee: LEADTREND TECHNOLOGY CORPORATIONInventors: Fong Cheng Yang, Kuan Hsien Chou
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Patent number: 10644584Abstract: A power controller provides open-circuit protection for a power supply when an open circuit occurs between a ground end of an auxiliary winding and an input ground. The power controller provides a PWM signal to determine an ON time and an OFF time of a power switch connected in series between an input voltage and the input ground. A deviation detector in the power controller detects a winding voltage at a floating end of the auxiliary winding during the ON time, and asserts an open protection signal when a variation of the winding voltage during the ON time fits a first predetermined condition, so as to keep the power switch turned OFF and provide the open-circuit protection.Type: GrantFiled: January 9, 2019Date of Patent: May 5, 2020Assignee: LEADTREND TECHNOLOGY CORPORATIONInventors: Kuan Hsien Chou, Fong Cheng Yang
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Publication number: 20200036290Abstract: Disclosure includes a control method in use of a switching-mode power supply that supplies an output voltage to a load. A line voltage generated by rectifying an alternating-current voltage is detected to compare with a first reference voltage. A control signal is generated in response to the comparison of the line voltage and the first reference voltage. When the line voltage is less than the first reference voltage, the control signal is used to increase converted power that the switching-mode power supply provides to the output voltage. When the line voltage is not less than the first reference voltage, the control signal has no influence to the converted power.Type: ApplicationFiled: July 2, 2019Publication date: January 30, 2020Inventors: Fong Cheng YANG, Kuan Hsien CHOU
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Publication number: 20190238048Abstract: A power controller provides open-circuit protection for a power supply when an open circuit occurs between a ground end of an auxiliary winding and an input ground. The power controller provides a PWM signal to determine an ON time and an OFF time of a power switch connected in series between an input voltage and the input ground. A deviation detector in the power controller detects a winding voltage at a floating end of the auxiliary winding during the ON time, and asserts an open protection signal when a variation of the winding voltage during the ON time fits a first predetermined condition, so as to keep the power switch turned OFF and provide the open-circuit protection.Type: ApplicationFiled: January 9, 2019Publication date: August 1, 2019Inventors: Kuan Hsien Chou, Fong Cheng Yang
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Patent number: 9197054Abstract: A circuit for controlling a latch mode of a pulse width modulation circuit includes a D flip-flop, a voltage generation unit, a comparator, and a logic unit. The D flip-flop generates a switch control signal according to a latch enable signal. The voltage generation unit generates a discharge current, and a voltage divider resistor group included in the voltage generation unit generates a first voltage when the voltage generation unit is turned on according to the switch control signal. A voltage of a predetermined pin of the pulse width modulation circuit is equal to a predetermined voltage when the discharge current is equal to the charge current. The comparator compares a reference voltage with the first voltage to generate a comparison signal. The logic unit generates a clear signal according to the comparison signal. The D flip-flop clears the switch control signal according to the clear signal.Type: GrantFiled: July 31, 2013Date of Patent: November 24, 2015Assignee: Leadtrend Technology Corp.Inventors: Ming-Chang Tsou, Fong-Cheng Yang, Shun-Chin Chou
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Patent number: 8957656Abstract: A power controller has a high-side driver, a low-side driver, a voltage divider, and a comparator. The high-side driver drives a high-side power switch, powered by a boost power line and a connection node. The low-side driver drives a low-side power switch, powered by an operation power line and a ground power line. The voltage divider has a first resistor having a first node for providing a detection voltage and a second node coupled to the boost power line or the connection node. The voltage divider has a second resistor coupled between the first node of the first resistor and the ground power line. When the low-side power switch is turned off, the comparator compares the detection voltage with a reference voltage. When the detection voltage is higher than the reference voltage, the comparator renders to turn on the high-side power switch.Type: GrantFiled: September 6, 2012Date of Patent: February 17, 2015Assignee: Leadtrend Technology Corp.Inventors: Fong-Cheng Yang, Kuo-Chien Huang
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Publication number: 20140043874Abstract: A circuit for controlling a latch mode of a pulse width modulation circuit includes a D flip-flop, a voltage generation unit, a comparator, and a logic unit. The D flip-flop generates a switch control signal according to a latch enable signal. The voltage generation unit generates a discharge current, and a voltage divider resistor group included in the voltage generation unit generates a first voltage when the voltage generation unit is turned on according to the switch control signal. A voltage of a predetermined pin of the pulse width modulation circuit is equal to a predetermined voltage when the discharge current is equal to the charge current. The comparator compares a reference voltage with the first voltage to generate a comparison signal. The logic unit generates a clear signal according to the comparison signal. The D flip-flop clears the switch control signal according to the clear signal.Type: ApplicationFiled: July 31, 2013Publication date: February 13, 2014Applicant: Leadtrend Technology Corp.Inventors: Ming-Chang Tsou, Fong-Cheng Yang, Shun-Chin Chou
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Publication number: 20130057243Abstract: A power controller has a high-side driver, a low-side driver, a voltage divider, and a comparator. The high-side driver drives a high-side power switch, powered by a boost power line and a connection node. The low-side driver drives a low-side power switch, powered by an operation power line and a ground power line. The voltage divider has a first resistor having a first node for providing a detection voltage and a second node coupled to the boost power line or the connection node. The voltage divider has a second resistor coupled between the first node of the first resistor and the ground power line. When the low-side power switch is turned off, the comparator compares the detection voltage with a reference voltage. When the detection voltage is higher than the reference voltage, the comparator renders to turn on the high-side power switch.Type: ApplicationFiled: September 6, 2012Publication date: March 7, 2013Inventors: Fong-Cheng Yang, Kuo-Chien Huang