Patents by Inventor Kun-Chang Chen
Kun-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).
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Publication number: 20240128876Abstract: A switching control circuit for use in controlling a resonant flyback power converter generates a first driving signal and a second driving signal. The first driving signal is configured to turn on the first transistor to generate a first current to magnetize a transformer and charge a resonant capacitor. The transformer and charge a resonant capacitor are connected in series. The second driving signal is configured to turn on the second transistor to generate a second current to discharge the resonant capacitor. During a power-on period of the resonant flyback power converter, the second driving signal includes a plurality of short-pulses configured to turn on the second transistor for discharging the resonant capacitor. A pulse-width of the short-pulses of the second driving signal is short to an extent that the second current does not exceed a current limit threshold.Type: ApplicationFiled: June 15, 2023Publication date: April 18, 2024Inventors: Yu-Chang Chen, Ta-Yung Yang, Kun-Yu Lin, Fu-Ciao Syu, Chia-Hsien Yang, Hsin-Yi Wu
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Publication number: 20240120844Abstract: A resonant flyback power converter includes: a first and a second transistors which form a half-bridge circuit for switching a transformer and a resonant capacitor to generate an output voltage; a current-sense device for sensing a switching current of the half-bridge circuit to generate a current-sense signal; and a switching control circuit generating a first and a second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal controls the half-bridge circuit to generate a positive current to magnetize the transformer and charge the resonant capacitor. The turn-on of the second driving signal controls the half-bridge circuit to generate a negative current to discharge the resonant capacitor. The switching control circuit turns off the first transistor when the positive current exceeds a positive-over-current threshold, and/or, turns off the second transistor when the negative current exceeds a negative-over-current threshold.Type: ApplicationFiled: April 10, 2023Publication date: April 11, 2024Inventors: Kun-Yu LIN, Ta-Yung YANG, Yu-Chang CHEN, Hsin-Yi WU, Fu-Ciao SYU, Chia-Hsien YANG
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Publication number: 20240120845Abstract: A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.Type: ApplicationFiled: April 14, 2023Publication date: April 11, 2024Inventors: Yu-Chang Chen, Ta-Yung Yang, Kun-Yu Lin, Hsin-Yi Wu
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Publication number: 20240120846Abstract: A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. During a DCM (discontinuous conduction mode) operation, the second driving signal includes a resonant pulse for demagnetizing the transformer and a ZVS (zero voltage switching) pulse for achieving ZVS of the first transistor. The resonant pulse is skipped when the output voltage is lower than a low-voltage threshold.Type: ApplicationFiled: April 14, 2023Publication date: April 11, 2024Inventors: Yu-Chang Chen, Ta-Yung Yang, Kun-Yu Lin, Hsin-Yi Wu
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Publication number: 20240071523Abstract: A memory device and a programming method thereof are provided. The programming method includes the following steps. According to a step value, based on an incremental step pulse programming scheme, multiple programming operations are performed for a selected memory page. In a setting mode, multiple program verify operations are respectively performed corresponding to the programming operations to respectively generate multiple pass bit numbers. In the setting mode, a pass bit number difference value of two pass bit numbers corresponding to two programming operations is calculated. In the setting mode, an amount of the step value is adjusted according to the pass bit number difference value.Type: ApplicationFiled: August 24, 2022Publication date: February 29, 2024Applicant: MACRONIX International Co., Ltd.Inventors: Kun-Tse Lee, Han-Sung Chen, Shih-Chang Huang
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Patent number: 10750002Abstract: A communication device includes a first body, a second body, a first audio module, and a second audio module. The second body is rotatably connected to the first body. The first audio module is disposed on the first body. The second audio module is at least partially disposed on the first body. When the second body rotates relatively to the first body to be in a first state to switch the communication device to be in a first operation mode, at least a portion of the first audio module is turned on, and the second audio module is turned off. When the second body rotates relatively to the first body to be in a second state to switch the communication device to be in a second operation mode, the first audio module is turned off, and the second audio module is turned on.Type: GrantFiled: January 7, 2019Date of Patent: August 18, 2020Assignee: COMPAL ELECTRONICS, INC.Inventors: Ching-Hua Li, Li-Fang Chen, Chen-Hsien Cheng, Yi-Chang Wu, Po-Yueh Lan, Yu-Wei Lai, Kun-Chang Chen, Yi-Chun Lin
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Publication number: 20190215393Abstract: A communication device includes a first body, a second body, a first audio module, and a second audio module. The second body is rotatably connected to the first body. The first audio module is disposed on the first body. The second audio module is at least partially disposed on the first body. When the second body rotates relatively to the first body to be in a first state to switch the communication device to be in a first operation mode, at least a portion of the first audio module is turned on, and the second audio module is turned off. When the second body rotates relatively to the first body to be in a second state to switch the communication device to be in a second operation mode, the first audio module is turned off, and the second audio module is turned on.Type: ApplicationFiled: January 7, 2019Publication date: July 11, 2019Applicant: COMPAL ELECTRONICS, INC.Inventors: Ching-Hua Li, Li-Fang Chen, Chen-Hsien Cheng, Yi-Chang Wu, Po-Yueh Lan, Yu-Wei Lai, Kun-Chang Chen, Yi-Chun Lin
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Patent number: 7397383Abstract: A remote monitoring method includes monitoring a plurality of components on a main board. When one of the plurality of components fails to function properly, a warning message is produced to indicate that the component is out of order. Afterward, the warning message is transmitted to a remote control device through a network medium. The remote control device then produces a plot to imitate the relative positions of the main board and the components and displays the malfunctioning component on the plot.Type: GrantFiled: May 15, 2006Date of Patent: July 8, 2008Assignee: Wistron CorporationInventors: Sen-Ta Chan, Yi-Chang Wu, Yi-Hsun Chen, Kun-Chang Chen
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Publication number: 20070222628Abstract: A remote monitoring method includes monitoring a plurality of components on a main board. When one of the plurality of components fails to function properly, a warning message is produced to indicate that the component is out of order. Afterward, the warning message is transmitted to a remote control device through a network medium. The remote control device then produces a plot to imitate the relative positions of the main board and the components and displays the malfunctioning component on the plot.Type: ApplicationFiled: May 15, 2006Publication date: September 27, 2007Inventors: Sen-Ta Chan, Yi-Chang Wu, Yi-Hsun Chen, Kun-Chang Chen
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Publication number: 20060179991Abstract: A blind cutter includes at least a worktable, a drive device, and a number of knife modules. The drive device has a speed-reducing motor for rotating a rotary shaft, and a number of gears fixed on the rotary shaft to engage and move a number of racks. The knife modules respectively have a module base arranged lengthwise on the work table, having a special hole for special blinds to pass through, with a knife fitted in slidably and respectively moved by the racks for cutting a blind material respectively extending on the module bases.Type: ApplicationFiled: February 16, 2005Publication date: August 17, 2006Inventors: Ming Nien, Wen-Yeu Lee, Kun-Chang Chen, Kun-Ming Chuang
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Publication number: 20030150755Abstract: A compact disk case is provided having a disk retainer provided inside each of two hinged cover shells thereof, the disk retainer having two springy radial arms respectively upwardly extended from the inner sidewall of the corresponding cover shell toward each other, first and second retaining blocks respectively formed integral with the free ends of the springy radial arms, the first retaining block having a protruded portion forwardly extended from one side thereof toward the second retaining block, the second retaining block having a recessed portion adapted for receiving the protruded portion of the first retaining block to prevent the retaining blocks from jamming the user's finger during disk loading, and two disk retaining flanges provided at the retaining blocks for synchronous movement with the retaining blocks and locking the loading disk.Type: ApplicationFiled: February 11, 2002Publication date: August 14, 2003Inventor: Kun Chang Chen
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Patent number: D488000Type: GrantFiled: January 18, 2002Date of Patent: April 6, 2004Assignee: Shian Ke Co., Ltd.Inventor: Kun-Chang Chen