Patents by Inventor Kuang-Fu Chang
Kuang-Fu 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: 20230320329Abstract: A poultry voiceprint identification system includes a receiver, a feature processing module, a feature analysis module and an artificial intelligence sound model. The receiver is arranged in a poultry house for receiving a recording information of a poultry house for a period of time. A stocking density of poultry in the poultry house is 7 per square meter or more. The feature processing module converts the recording information into a plurality of sound features via filtering, segmentation and extraction methods. The artificial intelligence sound model generates a training group according to the sound features. The feature analysis module analyzes each sound feature to determine a sound state of each sound feature through an artificial intelligence sound model. The sound state includes a normal poultry sound state or an abnormal poultry sound state. The system accurately and quickly identifies the sound from abnormal poultry among high stocking density poultry.Type: ApplicationFiled: April 10, 2023Publication date: October 12, 2023Applicant: iChase Co., Ltd.Inventors: Chieh-yu LIN, Kuang-fu CHANG, Li-wan HUANG
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Patent number: 11496055Abstract: The present invention discloses a power converter, a switch control circuit, and a short circuit detection method for current sensing resistor of the power converter. The power converter includes: a transformer, a power switch, a current sensing resistor and a switch control unit. The current sensing resistor has one end coupled to the power switch and another end coupled to ground. The switch control unit generates the operation signal to control the power switch. The switch control unit generates a first sample-and-hold voltage at a first time point and a second sample-and-hold voltage at a second time point according to a voltage across the current sensing resistor. When a voltage difference between the first sample-and-hold voltage and the second sample-and-hold voltage is smaller than a reference voltage, it is determined that a short circuit occurs in the current sensing resistor.Type: GrantFiled: January 7, 2019Date of Patent: November 8, 2022Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuang-Fu Chang, Tzu-Chen Lin
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Publication number: 20220096013Abstract: The present invention provides a bioinformation measuring device having a first device body, a second device body, and a transducer assembly. The first device body has a first inner surface, and the second device body has a second inner surface facing the first inner surface. An accommodation space for finger is surrounded by the first inner surface and the second inner surface. The transducer assembly is disposed at the second inner surface and includes a finger contact surface facing the first inner surface. The finger contact surface is movable in a first direction perpendicular to the finger contact surface.Type: ApplicationFiled: December 6, 2021Publication date: March 31, 2022Applicant: Cardio Ring Technologies, Inc.Inventors: Kuang-Fu CHANG, Yu-Chi WANG, Wen-Pin SHIH
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Publication number: 20210093209Abstract: The present invention provides a wearable device for monitoring blood-pressure.Type: ApplicationFiled: November 30, 2020Publication date: April 1, 2021Applicant: Cardio Ring Technologies, Inc.Inventors: Kuang-Fu CHANG, Yu-Chi WANG, Leng-Chun CHEN, Jun-Ming CHEN, Wen-Pin SHIH
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Publication number: 20210022629Abstract: The present invention provides a wearable device for monitoring blood-pressure.Type: ApplicationFiled: August 10, 2020Publication date: January 28, 2021Applicant: Cardio Ring Technologies, Inc.Inventors: Kuang-Fu CHANG, Yu-Chi WANG, Leng-Chun CHEN, Jun-Ming CHEN, Wen-Pin SHIH
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Patent number: 10786163Abstract: Devices and methods for monitoring blood pressure with a wearable device, which includes a contact member that concentrates radially directed tissue movement produced by arterial motion into a relatively small spot to compress the strain device. This concentration significantly increases the sensitivity of the force detecting device and allows further miniaturization of the device.Type: GrantFiled: May 31, 2019Date of Patent: September 29, 2020Assignee: Cardio Ring Technologies, Inc.Inventors: Kuang-Fu Chang, Yu-Chi Wang, Leng-Chun Chen, Jun-Ming Chen, Wen-Pin Shih
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Patent number: 10686366Abstract: A flyback power converter includes: a transformer, a primary side switch and a primary side controller circuit. The primary side controller circuit includes: a pulse modulation circuit and a protection control circuit. The pulse modulation circuit generates a pulse modulation signal. The protection control circuit is coupled to the pulse modulation circuit and compares an AC voltage related signal with an over voltage threshold. When the AC voltage related signal exceeds the over voltage threshold, the comparison circuit generates an over voltage protection trigger signal. When the pulse number of the over voltage protection trigger signal exceeds the over voltage counting threshold, the over voltage counter circuit triggers an over voltage protection signal, to indicate that an over voltage condition occurs, and a protection operation is performed.Type: GrantFiled: April 26, 2019Date of Patent: June 16, 2020Assignee: RICHTEK TECHNOLOGY CORPORATIONInventor: Kuang-Fu Chang
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Publication number: 20200014305Abstract: A flyback power converter includes: a transformer, a primary side switch and a primary side controller circuit. The primary side controller circuit includes: a pulse modulation circuit and a protection control circuit. The pulse modulation circuit generates a pulse modulation signal. The protection control circuit is coupled to the pulse modulation circuit and compares an AC voltage related signal with an over voltage threshold. When the AC voltage related signal exceeds the over voltage threshold, the comparison circuit generates an over voltage protection trigger signal. When the pulse number of the over voltage protection trigger signal exceeds the over voltage counting threshold, the over voltage counter circuit triggers an over voltage protection signal, to indicate that an over voltage condition occurs, and a protection operation is performed.Type: ApplicationFiled: April 26, 2019Publication date: January 9, 2020Inventor: Kuang-Fu Chang
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Patent number: 10505461Abstract: A flyback power converter circuit includes a transformer, a power switch, a primary side controller circuit, and a secondary side controller circuit. The transformer converts an input voltage to a first, a second and a third output voltages. The primary side controller circuit and the secondary side control are powered by the second voltage and a third voltage, respectively. In a burst mode, when the second output voltage is lower than a first threshold, a power regulation mode is triggered to control the power switch, such that the second output voltage is between the first threshold and a second threshold. After a predetermined delay time period, the power regulation mode stops and the flyback power converter circuit enters a reboot procedure, wherein the power switch is OFF such that the third voltage is lower than a secondary side reboot threshold, whereby the secondary side controller circuit is reboot.Type: GrantFiled: April 25, 2018Date of Patent: December 10, 2019Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuang-Fu Chang, Chien-Hung Chen
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Publication number: 20190365258Abstract: The present invention provides a wearable device for monitoring blood-pressure.Type: ApplicationFiled: May 31, 2019Publication date: December 5, 2019Applicant: Cardio Ring Technologies, Inc.Inventors: Kuang-Fu CHANG, Yu-Chi WANG, Leng-Chun CHEN, Jun-Ming CHEN, Wen-Pin SHIH
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Patent number: 10320304Abstract: The present invention provides a power converter, a secondary side controller, and a short circuit determination method for a current sensing resistor of the power converter. The power converter is controlled by a power switch to convert an input voltage to an output voltage, and provide an output current to an output terminal. The power converter senses the output current by a current sensing resistor to generate first information which relates to the output current. The power converter generates second information according to an ON time, an OFF time or a switching period of the power switch, or according to an energy-releasing period for transmitting energy to the output terminal, wherein the second information indicates whether there is a substantial amount of energy transmitted to the output terminal. By checking whether the first information and the second information are contradictory to each other, a malfunction can be found.Type: GrantFiled: October 11, 2016Date of Patent: June 11, 2019Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Yu-Kai Chen, Kuang-Fu Chang
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Publication number: 20190140547Abstract: The present invention discloses a power converter, a switch control circuit, and a short circuit detection method for current sensing resistor of the power converter. The power converter includes: a transformer, a power switch, a current sensing resistor and a switch control unit. The current sensing resistor has one end coupled to the power switch and another end coupled to ground. The switch control unit generates the operation signal to control the power switch. The switch control unit generates a first sample-and-hold voltage at a first time point and a second sample-and-hold voltage at a second time point according to a voltage across the current sensing resistor. When a voltage difference between the first sample-and-hold voltage and the second sample-and-hold voltage is smaller than a reference voltage, it is determined that a short circuit occurs in the current sensing resistor.Type: ApplicationFiled: January 7, 2019Publication date: May 9, 2019Inventors: Kuang-Fu Chang, Tzu-Chen Lin
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Patent number: 10218280Abstract: The present invention discloses a power converter, a switch control circuit, and a short circuit detection method for current sensing resistor of the power converter. The power converter includes: a transformer, a power switch, a current sensing resistor and a switch control unit. The current sensing resistor has one end coupled to the power switch and another end coupled to ground. The switch control unit generates the operation signal to control the power switch. The switch control unit generates a first sample-and-hold voltage at a first time point and a second sample-and-hold voltage at a second time point according to a voltage across the current sensing resistor. When a voltage difference between the first sample-and-hold voltage and the second sample-and-hold voltage is smaller than a reference voltage, it is determined that a short circuit occurs in the current sensing resistor.Type: GrantFiled: February 24, 2016Date of Patent: February 26, 2019Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuang-Fu Chang, Tzu-Chen Lin
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Patent number: 10153703Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.Type: GrantFiled: February 15, 2017Date of Patent: December 11, 2018Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuang-Fu Chang, Tzu-Chen Lin, Chien-Fu Tang
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Publication number: 20180323717Abstract: A flyback power converter circuit includes a transformer, a power switch, a primary side controller circuit, and a secondary side controller circuit. The transformer converts an input voltage to a first, a second and a third output voltages. The primary side controller circuit and the secondary side control are powered by the second voltage and a third voltage, respectively. In a burst mode, when the second output voltage is lower than a first threshold, a power regulation mode is triggered to control the power switch, such that the second output voltage is between the first threshold and a second threshold. After a predetermined delay time period, the power regulation mode stops and the flyback power converter circuit enters a reboot procedure, wherein the power switch is OFF such that the third voltage is lower than a secondary side reboot threshold, whereby the secondary side controller circuit is reboot.Type: ApplicationFiled: April 25, 2018Publication date: November 8, 2018Inventors: Kuang-Fu Chang, Chien-Hung Chen
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Patent number: 9853554Abstract: The present invention provides a power converter, and a control circuit and a standby power saving method thereof. The power converter provides an output voltage from an output terminal through an enable switch circuit to a power receiver. A detection signal shows whether a voltage at a signal transmission pin of the power converter is in a predetermined range, if not, the enable switch circuit is turned OFF. The power converter adjusts a feedback signal according to the detection signal or according to the detection signal and the output voltage, so as to adjust the output voltage to be lower than a normal operation level in a normal operation mode, to save power in a standby mode.Type: GrantFiled: May 12, 2016Date of Patent: December 26, 2017Assignee: RICHTEK TECHNOLOGY CORPORATIONInventor: Kuang-Fu Chang
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Publication number: 20170338746Abstract: The present invention provides a power converter, a secondary side controller, and a short circuit determination method for a current sensing resistor of the power converter. The power converter is controlled by a power switch to convert an input voltage to an output voltage, and provide an output current to an output terminal. The power converter senses the output current by a current sensing resistor to generate first information which relates to the output current. The power converter generates second information according to an ON time, an OFF time or a switching period of the power switch, or according to an energy-releasing period for transmitting energy to the output terminal, wherein the second information indicates whether there is a substantial amount of energy transmitted to the output terminal. By checking whether the first information and the second information are contradictory to each other, a malfunction can be found.Type: ApplicationFiled: October 11, 2016Publication date: November 23, 2017Inventors: Yu-Kai Chen, Kuang-Fu Chang
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Publication number: 20170163162Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.Type: ApplicationFiled: February 15, 2017Publication date: June 8, 2017Inventors: Kuang-Fu Chang, Tzu-Chen Lin, Chien-Fu Tang
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Patent number: 9627982Abstract: A flyback power converter includes a transformer which has a primary winding, a secondary winding, and an auxiliary winding; a power switch controlling the conduction of the primary winding; and a control circuit generating a control signal to control the power switch, wherein the control circuit is an integrated circuit having a current sensing pin for obtaining a current sensing signal of a current through the power switch. The flyback power converter further includes a temperature-sensitive resistor or a mode detection resistor coupled between the auxiliary winding and the current sensing pin. The temperature-sensitive resistor provides a temperature-related signal for the control circuit to perform an over-temperature protection, or the temperature-sensitive resistor provides a mode detection signal for the control circuit to determine an operation mode of the flyback power converter.Type: GrantFiled: April 27, 2015Date of Patent: April 18, 2017Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kun-Yu Lin, Chien-Fu Tang, Hsin-Yi Wu, Kuang-Fu Chang
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Patent number: 9627984Abstract: The present invention provides an isolated power supply circuit with a programmable function and a control method thereof. The isolated power supply circuit includes: a transformer circuit, a power switch circuit, a control circuit, and a discharge circuit. The control circuit generates an operation signal and a bleeding signal according to a setting signal. The discharge circuit is coupled to an output node, for generating a discharging current. When the programmable output voltage at the output node switches between different predetermined levels, in a transition period, the bleeding signal adjusts the discharging current to discharge the output node, such that the transition period is shortened.Type: GrantFiled: April 1, 2015Date of Patent: April 18, 2017Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuang-Fu Chang, Tzu-Chen Lin, Chih-Wei Chi