Patents by Inventor Kuan-Chun Fang

Kuan-Chun Fang 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).

  • Publication number: 20250023443
    Abstract: A feedback circuit is used for a power supply device. The power supply device includes a primary side circuit and a secondary side circuit. The feedback circuit includes a feedback voltage generation circuit, a base voltage generation circuit, and a compensation signal generation circuit. The feedback voltage generation circuit is electrically connected to the secondary side circuit. The feedback voltage generation circuit generates a feedback voltage according to a bias voltage and an output voltage of the power supply device. The base voltage generation circuit generates a base voltage according to the feedback voltage. The compensation signal generation circuit generates a compensation signal according to the feedback voltage and the base voltage and provides the compensation signal to a controller in the primary side circuit. A voltage value of the feedback voltage is lower than a voltage value of the bias voltage. The voltage value of the feedback voltage varies with the change of the output voltage.
    Type: Application
    Filed: August 8, 2023
    Publication date: January 16, 2025
    Applicant: Power Forest Technology Corporation
    Inventors: Yu-Chao Lin, Kuan-Chun Fang, Zhi-Yang Zhang, Chien-Wei Kuan
  • Publication number: 20240356426
    Abstract: A controller for a power supply device includes a transmission terminal, first and second memory circuits, a determining circuit, and a control circuit. The determining circuit generates a first mode signal when an input voltage value is lower than a reference voltage value and generates a second mode signal when the input voltage value is greater than or equal to the reference voltage value. The control circuit enters a first mode and a second mode in response to the first mode signal and the second mode signal, respectively. The control circuit writes a control parameter from the transmission terminal into the first memory circuit in the first mode and uses the control parameter in the second mode to test the power supply device. When the control parameter meets an expected function of the power supply device, the control circuit writes the control parameter into the second memory circuit.
    Type: Application
    Filed: August 4, 2023
    Publication date: October 24, 2024
    Applicant: Power Forest Technology Corporation
    Inventors: Kuan-Chun Fang, Yu-Chao Lin, Jenn-Hwa Shyu, Ting-Ching Hsu, Chien-Wei Kuan
  • Publication number: 20240321531
    Abstract: The present invention provides a switch waterproof structure, which mainly includes a body, a plugger, a lever, a pin and a waterproof material. The body, the plugger and the pin each have several grooves respectively arranged thereon, and several supporting parts are each arranged between the grooves. The plugger is assembled and arranged in the body. The lever is assembled and arranged on the plugger. The pin is assembled and arranged on the body. The waterproof material after hot-melting is injected into the body, the plugger and the pin. The corresponding blocking portions can be formed after the waterproof material is flowing into the grooves of the body, the grooves of the plugger and the grooves of the pin. The blocking portions are tightly bonded to the supporting parts layer by layer, so that the waterproof material has a tight waterproof function.
    Type: Application
    Filed: March 22, 2023
    Publication date: September 26, 2024
    Inventors: KUAN-CHUN FANG, SHUO-I FANG
  • Patent number: 11916487
    Abstract: An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.
    Type: Grant
    Filed: March 24, 2022
    Date of Patent: February 27, 2024
    Assignee: Power Forest Technology Corporation
    Inventors: Chao-Chang Chiu, Kuan-Chun Fang, Yueh-Chang Chen, Tzu-Chi Huang, Che-Hao Meng
  • Publication number: 20230261580
    Abstract: An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.
    Type: Application
    Filed: March 24, 2022
    Publication date: August 17, 2023
    Applicant: Power Forest Technology Corporation
    Inventors: Chao-Chang Chiu, Kuan-Chun Fang, Yueh-Chang Chen, Tzu-Chi Huang, Che-Hao Meng