Patents by Inventor Fangyun LIU
Fangyun LIU 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: 20240036406Abstract: An electrostatic protection circuit, a power management chip, and a display terminal are provided. The electrostatic protection circuit includes a level shift unit and a power management unit. The electrostatic protection circuit also includes a clamping module. An input terminal of the clamping module receives an electrostatic detection signal. An output terminal of the clamp module outputs a fault detection signal. The output terminal of the clamp module continues to output a high electrical potential when the electrostatic detection signal transits from a low electrical potential to the high electrical potential until the power management unit stops operating.Type: ApplicationFiled: December 20, 2021Publication date: February 1, 2024Applicant: TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.Inventor: Fangyun Liu
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Patent number: 10637230Abstract: An over current protection circuit, comprising: a current transformer, having a primary winding connected in series with a primary winding of a power supply transformer and a secondary winding, of which one end is grounded and the other end is coupled to a diode anode; a first resistor, having one end coupled to a diode cathode and the other end grounded; a second resistor, having one end coupled to the diode cathode and the other end coupled to a zener diode cathode; a triode, having a base coupled to a zener diode anode, an emitter grounded and a collector coupled to a light emitter cathode; wherein a light emitter anode is coupled to a LLC chip and a first voltage output end in the power supply; an output end of a light receiver is ground, an input end is coupled to a second voltage output end and a PFC chip.Type: GrantFiled: December 6, 2017Date of Patent: April 28, 2020Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.Inventors: Yong Yang, Fangyun Liu
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Patent number: 10333325Abstract: Disclosed is a charging state indicating circuit, including a indicating circuit, having: a first operational amplifier, having a non-inverting input end inputted with a first sampled voltage and an inverting input end inputted with a first reference voltage; a first triode, having a base coupled to an output end of the first operational amplifier through a first resistor, an emitter coupled to a second reference voltage through a second resistor and a collector coupled to an anode of a first light emitting diode; a second triode, having a base coupled to the output end of the first operational amplifier through a third resistor, an emitter coupled to an anode of a second light emitting diode and a collector coupled to the second reference voltage; a cathode of the first light emitting diode and a cathode of the second light emitting diode are grounded and light colors are different.Type: GrantFiled: December 6, 2017Date of Patent: June 25, 2019Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.Inventors: Yong Yang, Fangyun Liu
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Patent number: 10305374Abstract: A power supplying circuit includes a rectifier, a flyback converter, a power factor correction circuit, an LLC resonant converter, a power factor correction (PFC) controller, and a LLC resonant controller. The PFC controller is configured to supply a first operating voltage to the PFC circuit. The LLC resonant controller is configured to supply a second operating voltage to the LLC resonant converter upon a condition that a voltage applied on the output terminal of the PFC circuit reaches a predetermined voltage.Type: GrantFiled: March 17, 2017Date of Patent: May 28, 2019Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.Inventors: Yong Yang, Fangyun Liu
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Patent number: 10278257Abstract: A protection circuit and an LED driving circuit are provided, which include a Zener diode, a potential dividing unit, a first switch unit, and a second switch unit. The cathode and anode of the Zener diode are connected to a first power source and an input terminal of the potential dividing unit, respectively. The control terminal, input terminal, and output terminal of the first switch unit are connected to an output terminal of the potential dividing unit, a second power source, and the control terminal of the second switch unit, respectively. The input terminal and output terminal of the second switch unit are connected to the second power source and a boost circuit, respectively.Type: GrantFiled: March 17, 2017Date of Patent: April 30, 2019Assignee: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.Inventors: Yong Yang, Fangyun Liu
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Publication number: 20190027948Abstract: Disclosed is a charging state indicating circuit, including a indicating circuit, having: a first operational amplifier, having a non-inverting input end inputted with a first sampled voltage and an inverting input end inputted with a first reference voltage; a first triode, having a base coupled to an output end of the first operational amplifier through a first resistor, an emitter coupled to a second reference voltage through a second resistor and a collector coupled to an anode of a first light emitting diode; a second triode, having a base coupled to the output end of the first operational amplifier through a third resistor, an emitter coupled to an anode of a second light emitting diode and a collector coupled to the second reference voltage; a cathode of the first light emitting diode and a cathode of the second light emitting diode are grounded and light colors are different.Type: ApplicationFiled: December 6, 2017Publication date: January 24, 2019Inventors: Yong Yang, Fangyun Liu
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Publication number: 20190027918Abstract: An over current protection circuit, comprising: a current transformer, having a primary winding connected in series with a primary winding of a power supply transformer and a secondary winding, of which one end is grounded and the other end is coupled to a diode anode; a first resistor, having one end coupled to a diode cathode and the other end grounded; a second resistor, having one end coupled to the diode cathode and the other end coupled to a zener diode cathode; a triode, having a base coupled to a zener diode anode, an emitter grounded and a collector coupled to a light emitter cathode; wherein a light emitter anode is coupled to a LLC chip and a first voltage output end in the power supply; an output end of a light receiver is ground, an input end is coupled to a second voltage output end and a PFC chip.Type: ApplicationFiled: December 6, 2017Publication date: January 24, 2019Inventors: Yong Yang, Fangyun Liu
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Publication number: 20180294713Abstract: A power supplying circuit includes a rectifier, a flyback converter, a power factor correction circuit, an LLC resonant converter, a power factor correction (PFC) controller, and a LLC resonant controller. The PFC controller is configured to supply a first operating voltage to the PFC circuit. The LLC resonant controller is configured to supply a second operating voltage to the LLC resonant converter upon a condition that a voltage applied on the output terminal of the PFC circuit reaches a predetermined voltage.Type: ApplicationFiled: March 17, 2017Publication date: October 11, 2018Inventors: Yong YANG, Fangyun LIU
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Publication number: 20180295697Abstract: A protection circuit and an LED driving circuit are provided, which include a Zener diode, a potential dividing unit, a first switch unit, and a second switch unit. The cathode and anode of the Zener diode are connected to the first power source and an input terminal of the potential dividing unit, respectively. The control terminal, input terminal, and output terminal of the first switch unit are connected to the output terminal of the potential dividing unit, the second power source, and the control terminal of the second switch unit, respectively. The input terminal and output terminal of the second switch unit are connected to the second power source and the boost circuit, respectively.Type: ApplicationFiled: March 17, 2017Publication date: October 11, 2018Inventors: Yong YANG, Fangyun LIU