Patents by Inventor Ying-chang Chen

Ying-chang Chen 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).

  • Patent number: 12136885
    Abstract: A resonant half-bridge flyback power converter includes: a first transistor and a second transistor which form a half-bridge circuit; a transformer and a resonant capacitor connected in series and coupled to the half-bridge circuit; and a switching control circuit configured to generate a first driving signal and a second driving signal to control the first transistor and the second transistor respectively for switching the transformer to generate an output voltage. The first driving signal is configured to magnetize the transformer. The second driving signal includes at most one pulse between two consecutive pulses of the first driving signal. The switching control circuit generates a skipping cycle period when an output power is lower than a predetermined threshold. A resonant pulse of the second driving signal is skipped during the skipping cycle period. The skipping cycle period is increased in response to the decrease of the output power.
    Type: Grant
    Filed: February 8, 2024
    Date of Patent: November 5, 2024
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Ta-Yung Yang, Ying-Chieh Su, Yu-Chang Chen
  • Patent number: 12040300
    Abstract: A semiconductor package includes a first die, a second die, and a hybrid-type adhesive. The second die is stacked on the first die through the hybrid-type adhesive. The hybrid-type adhesive includes a conductive adhesive and a non-conductive adhesive. The conductive adhesive is disposed between the non-conductive adhesive and the first die. The non-conductive adhesive is disposed between the conductive adhesive and the second die.
    Type: Grant
    Filed: June 29, 2022
    Date of Patent: July 16, 2024
    Assignee: Airoha Technology Corp.
    Inventors: Ying-Chih Chen, Min-Yu Lin, Kuo-Chang Chang, Jen-Chan Huang
  • Patent number: 7549219
    Abstract: An automatic assembling system and method for camera lens units are provided. The system includes a main workstation, a barrel-feeding station, a lens-feeding station, and a camera lens-removing station. The method includes (A) operating a plurality of barrel-clamping units of the main workstation cyclically and intermittently along a feeding direction; (B) moving a plurality of barrels from a barrel standby area of the barrel-feeding station onto the barrel-clamping units in sequence; (C) moving a plurality of lens units from a lens standby area assembly of the lens-feeding station into the barrels to form the camera lens units; and (D) moving the camera lens units from the barrel-clamping units into a camera lens-collecting area of the camera lens-removing station. The steps (B, C, D) are performed in cooperation with the intermittent operations of the barrel-clamping units.
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: June 23, 2009
    Assignee: Asia Optical Co., Inc.
    Inventors: Po-Song Kao, Ying-Chang Chen, Yung-I Chang, En-Tzu Cheng
  • Patent number: 7353738
    Abstract: A device for cutting a sub-finished assembly (1) of plastic lens (10) includes a cutting member (2) and a holding member (3). The cutting member has a base (20), an upper plate (21), an upper cutter (23) mounted on the upper plate, a lower plate (22), a lower cutter (24) mounted on the lower plate, guiding posts (25) mounted on the base and guiding the movement of the upper and the lower plates, and a stopper (26). The upper plate moves toward the lens before the lower plate and until the upper cutter contacts the cutting point beside the lens. The stopper stops the upper plate from further moving after the upper cutter contacts the cutting point beside the lens. The lower cutter is moved by the lower plate to cut the lens from the sub-finished assembly of the lens. The holding member holds the lens during cutting.
    Type: Grant
    Filed: March 18, 2004
    Date of Patent: April 8, 2008
    Assignee: Asia Optical Co., Inc
    Inventor: Ying-Chang Chen
  • Publication number: 20050231819
    Abstract: An automatic assembling system and method for camera lens units are provided. The system includes a main workstation, a barrel-feeding station, a lens-feeding station, and a camera lens-removing station. The method includes (A) operating a plurality of barrel-clamping units of the main workstation cyclically and intermittently along a feeding direction; (B) moving a plurality of barrels from a barrel standby area of the barrel-feeding station onto the barrel-clamping units in sequence; (C) moving a plurality of lens units from a lens standby area assembly of the lens-feeding station into the barrels to form the camera lens units; and (D) moving the camera lens units from the barrel-clamping units into a camera lens-collecting area of the camera lens-removing station. The steps (B, C, D) are performed in cooperation with the intermittent operations of the barrel-clamping units.
    Type: Application
    Filed: January 7, 2005
    Publication date: October 20, 2005
    Inventors: Po-Song Kao, Ying-Chang Chen, Yung-I Chang, En-Tzu Cheng
  • Publication number: 20050204881
    Abstract: A device for cutting a sub-finished assembly (1) of plastic lens (10) includes a cutting member (2) and a holding member (3). The cutting member has a base (20), an upper plate (21), an upper cutter (23) mounted on the upper plate, a lower plate (22), a lower cutter (24) mounted on the lower plate, guiding posts (25) mounted on the base and guiding the movement of the upper and the lower plates, and a stopper (26). The upper plate moves toward the lens before the lower plate and until the upper cutter contacts the cutting point beside the lens. The stopper stops the upper plate from further moving after the upper cutter contacts the cutting point beside the lens. The lower cutter is moved by the lower plate to cut the lens from the sub-finished assembly of the lens. The holding member holds the lens during cutting.
    Type: Application
    Filed: March 18, 2004
    Publication date: September 22, 2005
    Inventor: Ying-Chang Chen
  • Patent number: 6424925
    Abstract: A tone detector includes at least one circuit (hereinafter “single phase reference matcher”) that not only performs a convolution of an input signal with a reference signal, but also compares the result of convolution with a threshold to determine if there is a match, and if so drives a signal active indicating that tone is present. If there is no match, another circuit (hereinafter “phase shifter”) delays the reference signal by a fraction (e.g. ⅛) of the measuring period, thereby to introduce a phase shift (e.g. &pgr;/8) between the input signal and the reference signal. The “single phase reference matcher” again performs the just-described operation, this time with a delayed reference signal, and repeats the operation as often as necessary (e.g. eight times) to cycle through the entire measuring period, thereby to ensure that tone (if present in the input signal) is detected irrespective of phase, during one of the operations.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: July 23, 2002
    Assignee: Integrated Telecom Express, Inc.
    Inventors: Man Ho Ku, Wai-Hung Leung, Po-Sheng Chou, Ying-chang Chen