Patents by Inventor Andrew Kwok-Cheung Lee
Andrew Kwok-Cheung Lee 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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Patent number: 9525352Abstract: The drive current of the switch in a switching power converter is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the switch drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the switch drive current.Type: GrantFiled: June 18, 2013Date of Patent: December 20, 2016Assignee: Dialog Semiconductor Inc.Inventors: Junjie Zheng, Jun Zheng, Andrew Kwok-Cheung Lee, John William Kesterson, Allan Ming-Lun Lin, Hien Huu Bui, Carrie Seim, Yong Li
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Patent number: 9391525Abstract: A controller of a switching power converter includes a voltage protection circuit that generates a modified supply voltage that does not exceed a predetermined threshold voltage to power one or more components of the controller.Type: GrantFiled: September 19, 2013Date of Patent: July 12, 2016Assignee: Dialog Semiconductor Inc.Inventors: Andrew Kwok-Cheung Lee, Jiang Chen, Yong Li
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Patent number: 9369054Abstract: The embodiments herein describe a switched mode power converter. In particular, the embodiments herein disclose techniques for reducing power consumption of a synchronous rectifier controller of the switched mode power converter. The switched mode power converter includes a plurality of circuit components that control operation of a synchronous rectifier included in the switched mode power converter. One or more of the circuit components may be disabled to reduce power consumption.Type: GrantFiled: May 7, 2014Date of Patent: June 14, 2016Assignee: Dialog Semiconductor Inc.Inventors: Pengju Kong, Andrew Kwok-Cheung Lee
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Patent number: 9112498Abstract: The embodiments herein describe a dynamic metal-oxide-semiconductor field-effect transistor (MOSFET) gate driver system architecture and control scheme. The MOSFET gate driver system dynamically adjusts both the gate driver turn-on-resistance and the gate driver turn-off resistance within a single (i.e., one) switching cycle to reduce electromagnetic interference (EMI) in the system and to minimize the conduction loss of a power MOSFET during operation.Type: GrantFiled: August 7, 2012Date of Patent: August 18, 2015Assignee: Dialog Semiconductor Inc.Inventors: Yong Li, Fuqiang Shi, Andrew Kwok-Cheung Lee, David Nguyen, Jiang Chen
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Patent number: 9101015Abstract: A power converter that controls a collector current of a bipolar junction transistor (BJT) by controlling the base current to the BJT after having determined the gain of the BJT. A gain detection block determines a gain of the BJT during a first mode. A current calculation block generates a current setting for the base current based on the gain of the BJT determined by the gain detection block during a second mode distinct from the first mode. In some embodiments, the power converter may be included in a LED lamp system.Type: GrantFiled: March 13, 2012Date of Patent: August 4, 2015Assignee: Dialog Semiconductor Inc.Inventors: Liang Yan, Clarita C. Poon, Hien Huu Bui, Chuanyang Wang, Andrew Kwok-Cheung Lee, John William Kesterson
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Publication number: 20150124495Abstract: The embodiments herein describe a switched mode power converter. In particular, the embodiments herein disclose techniques for reducing power consumption of a synchronous rectifier controller of the switched mode power converter. The switched mode power converter includes a plurality of circuit components that control operation of a synchronous rectifier included in the switched mode power converter. One or more of the circuit components may be disabled to reduce power consumption.Type: ApplicationFiled: May 7, 2014Publication date: May 7, 2015Applicant: Dialog Semiconductor Inc.Inventors: Pengju Kong, Andrew Kwok-Cheung Lee
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Patent number: 8716948Abstract: The embodiments disclosed herein describe the dynamic control of a switching power converter between different operation modes of the switching power converter. In one embodiment, the operation modes of the switching power converter include a switching mode and a linear mode. The switching power converter may be included in a LED lamp system according to one embodiment.Type: GrantFiled: March 13, 2012Date of Patent: May 6, 2014Assignee: Dialog Semiconductor Inc.Inventors: Andrew Kwok-Cheung Lee, Chuanyang Wang, Jiang Chen, Liang Yan
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Publication number: 20140085940Abstract: A controller of a switching power converter includes a voltage protection circuit that generates a modified supply voltage that does not exceed a predetermined threshold voltage to power one or more components of the controller.Type: ApplicationFiled: September 19, 2013Publication date: March 27, 2014Applicant: iWatt Inc.Inventors: Andrew Kwok-Cheung Lee, Jiang Chen, Yong Li
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Patent number: 8576586Abstract: A switching power converter comprises a transformer (110), a switch (108) coupled to the transformer (110), and a switch controller (200) coupled to the switch (108) for generating a switch drive signal (207) to turn on or off the switch (108). The drive current of the switch drive signal (207) is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the drive current.Type: GrantFiled: September 28, 2007Date of Patent: November 5, 2013Assignee: iWatt Inc.Inventors: Junjie Zheng, Jun Zheng, Andrew Kwok-Cheung Lee, John William Kesterson, Allan Ming-Lun Lin, Hien Huu Bui, Carrie Seim, Yong Li
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Publication number: 20130279209Abstract: The drive current of the switch in a switching power converter is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the switch drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the switch drive current.Type: ApplicationFiled: June 18, 2013Publication date: October 24, 2013Inventors: Junjie Zheng, Jun Zheng, Andrew Kwok-Cheung Lee, John William Kesterson, Allan Ming-Lun Lin, Hien Huu Bui, Carrie Seim, Yong Li
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Publication number: 20130242625Abstract: A power converter that controls a collector current of a bipolar junction transistor (BJT) by controlling the base current to the BJT after having determined the gain of the BJT. A gain detection block determines a gain of the BJT during a first mode. A current calculation block generates a current setting for the base current based on the gain of the BJT determined by the gain detection block during a second mode distinct from the first mode. In some embodiments, the power converter may be included in a LED lamp system.Type: ApplicationFiled: March 13, 2012Publication date: September 19, 2013Applicant: IWATT INC.Inventors: Liang Yan, Clarita C. Poon, Hien Huu Bui, Chuanyang Wang, Andrew Kwok-Cheung Lee, John William Kesterson
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Publication number: 20130241430Abstract: The embodiments disclosed herein describe the dynamic control of a switching power converter between different operation modes of the switching power converter. In one embodiment, the operation modes of the switching power converter include a switching mode and a linear mode. The switching power converter may be included in a LED lamp system according to one embodiment.Type: ApplicationFiled: March 13, 2012Publication date: September 19, 2013Applicant: IWATT, INC.Inventors: Andrew Kwok-Cheung Lee, Chuanyang Wang, Jiang Chen, Liang Yan
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Publication number: 20130107584Abstract: The embodiments herein describe a dynamic metal-oxide-semiconductor field-effect transistor (MOSFET) gate driver system architecture and control scheme. The MOSFET gate driver system dynamically adjusts both the gate driver turn-on-resistance and the gate driver turn-off resistance within a single (i.e., one) switching cycle to reduce electromagnetic interference (EMI) in the system and to minimize the conduction loss of a power MOSFET during operation.Type: ApplicationFiled: August 7, 2012Publication date: May 2, 2013Applicant: IWATT, INC.Inventors: Yong Li, Fuqiang Shi, Andrew Kwok-Cheung Lee, David Nguyen, Jiang Chen
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Publication number: 20100202165Abstract: A switching power converter comprises a transformer (110), a switch (108) coupled to the transformer (110), and a switch controller (200) coupled to the switch (108) for generating a switch drive signal (207) to turn on or off the switch (108). The drive current of the switch drive signal (207) is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the drive current.Type: ApplicationFiled: September 28, 2007Publication date: August 12, 2010Applicant: IWATT INC.Inventors: Junjie Zheng, Jun Zheng, Andrew Kwok-Cheung Lee, John William Kesterson, Allan Ming-Lun Lin, Hien Huu Bui, Carrie Seim, Yong Li