Patents by Inventor Clarita C. Poon
Clarita C. Poon 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: 9326343Abstract: An integrated LED controller drives and reads a passive dimmer and controls a power circuit for the LED. The integrated LED controller detects changes in the position of the passive dimmer and causes the power circuit to brighten or dim the LED accordingly. These functions are normally performed by multiple discrete components. However, the integrated LED controller is implemented as a single integrated circuit, thus reducing the size and cost of the LED dimming system. The integrated LED controller can also include a unified timing controller that coordinates the timing of multiple functions within the controller in a manner that reduces the noise sensitivity of the controller.Type: GrantFiled: July 10, 2013Date of Patent: April 26, 2016Assignee: Dialog Semiconductor Inc.Inventors: Liang Yan, Clarita C. Poon, Yimin Chen, Mark Eason, Chuanyang Wang
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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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Patent number: 8970115Abstract: A LED lamp that includes a LED lamp controller with delayed startup after a fault condition is detected. The type of the fault condition is used in determining a length of the startup delay, such as a number of power cycles during which the LED lamp controller is prevented from completing its configuration. Examples of different types of fault conditions include faults in a supply voltage or faults in a feedback voltage to the LED lamp controller. Fault type information can also be stored in circuitry that retains data and is not reset across the power cycles.Type: GrantFiled: February 22, 2013Date of Patent: March 3, 2015Assignee: Dialog Semiconductor Inc.Inventors: Richard M. Myers, Clarita C. Poon, Liang Yan
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Patent number: 8853968Abstract: A dimmable light emitting lamp configured to interface with cat-ear dimmer switches. The lamp includes one or more light emitting devices. The lamp also includes circuitry configured to receive an input voltage and provide regulated current to the one or more light emitting devices. The input voltage has a first voltage pulse that does not represent a dimming level of a dimmer switch and a second voltage pulse that represents the dimming level of the dimmer switch. The circuitry determines a first duration corresponding to a length of the first voltage pulse and a second duration corresponding to a length of the second voltage pulse responsive to first duration. The circuitry adjusts the regulated current to the light emitting devices according to the second duration to adjust output light intensity of the light emitting devices.Type: GrantFiled: March 5, 2013Date of Patent: October 7, 2014Assignee: Dialog Semiconductor Inc.Inventors: Richard M. Myers, Clarita C. Poon, Liang Yan
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Patent number: 8723437Abstract: The embodiments disclosed herein describe the adjusting of filter bandwidths in a multi-loop LED dimmer control circuit based on received dimmer input signals. The bandwidth of a filter in an active loop (a loop driving an LED power circuit) is decreased to prevent signal noise and associated LED flickering. Likewise, the bandwidth of a filter in an inactive loop (a loop not driving the LED power circuit) is increased to a pre-determined maximum in order to improve response time and decrease potential overshoot or undershoot during dimmer adjustment.Type: GrantFiled: December 10, 2012Date of Patent: May 13, 2014Assignee: Dialog Semiconductor Inc.Inventors: Xiaoyan Wang, John William Kesterson, Clarita C. Poon, Guang Feng, Haiju Li
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Publication number: 20140021885Abstract: An integrated LED controller drives and reads a passive dimmer and controls a power circuit for the LED. The integrated LED controller detects changes in the position of the passive dimmer and causes the power circuit to brighten or dim the LED accordingly. These functions are normally performed by multiple discrete components. However, the integrated LED controller is implemented as a single integrated circuit, thus reducing the size and cost of the LED dimming system. The integrated LED controller can also include a unified timing controller that coordinates the timing of multiple functions within the controller in a manner that reduces the noise sensitivity of the controller.Type: ApplicationFiled: July 10, 2013Publication date: January 23, 2014Inventors: Liang Yan, Clarita C. Poon, Yimin Chen, Mark Eason, Chuanyang Wang
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Publication number: 20130257280Abstract: A LED lamp that includes a LED lamp controller with delayed startup after a fault condition is detected. The type of the fault condition is used in determining a length of the startup delay, such as a number of power cycles during which the LED lamp controller is prevented from completing its configuration. Examples of different types of fault conditions include faults in a supply voltage or faults in a feedback voltage to the LED lamp controller. Fault type information can also be stored in circuitry that retains data and is not reset across the power cycles.Type: ApplicationFiled: February 22, 2013Publication date: October 3, 2013Applicant: IWATT INC.Inventors: Richard M. Myers, Clarita C. Poon, Liang Yan
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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: 20130241441Abstract: A dimmable light emitting lamp configured to interface with cat-ear dimmer switches. The lamp includes one or more light emitting devices. The lamp also includes circuitry configured to receive an input voltage and provide regulated current to the one or more light emitting devices. The input voltage has a first voltage pulse that does not represent a dimming level of a dimmer switch and a second voltage pulse that represents the dimming level of the dimmer switch. The circuitry determines a first duration corresponding to a length of the first voltage pulse and a second duration corresponding to a length of the second voltage pulse responsive to first duration. The circuitry adjusts the regulated current to the light emitting devices according to the second duration to adjust output light intensity of the light emitting devices.Type: ApplicationFiled: March 5, 2013Publication date: September 19, 2013Applicant: IWATT INC.Inventors: Richard M. Myers, Clarita C. Poon, Liang Yan