Patents by Inventor Nan Shi
Nan Shi 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: 11063510Abstract: The feedback loop of a switching power converter controller is provided with an averaging circuit that averages either an output voltage, an error signal, or a control voltage. Regardless of which feedback signal is averaged, the averaging occurs over a first cycle of a rectified input voltage to form an averaged signal that is used by the feedback loop in a subsequent cycle of the rectified input voltage.Type: GrantFiled: August 22, 2019Date of Patent: July 13, 2021Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Laiqing Ping, Xiaoyan Wang, Nan Shi
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Publication number: 20210057988Abstract: The feedback loop of a switching power converter controller is provided with an averaging circuit that averages either an output voltage, an error signal, or a control voltage. Regardless of which feedback signal is averaged, the averaging occurs over a first cycle of a rectified input voltage to form an averaged signal that is used by the feedback loop in a subsequent cycle of the rectified input voltage.Type: ApplicationFiled: August 22, 2019Publication date: February 25, 2021Inventors: Laiqing PING, Xiaoyan WANG, Nan SHI
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Patent number: 10848056Abstract: A system for improving a power factor (PF) of a power converter in signal communication with a rectifier and an electromagnetic interference capacitor is disclosed. The system includes a controller and a threshold detector. The threshold detector is configured to measure and compare a rectified voltage against a threshold voltage and the controller is configured to set the power converter to a stop-mode. The power converter is set to the stop-mode at a stop-time that is less than a first zero-crossing time. The controller is further configured to set the power converter to a run-mode at a time that is past the first zero-crossing time.Type: GrantFiled: August 19, 2019Date of Patent: November 24, 2020Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Naidong Xu, Laiqing Ping, Nan Shi
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Patent number: 10770968Abstract: An adaptive pulse frequency modulation for a switching power converter is provided that varies the switching frequency across a cycle of a rectified input voltage for the switching power converter From a beginning of the cycle of the rectified input voltage, the switching frequency decreases from a maximum value to a minimum value at a mid-point of the cycle and then increases from the mid-point back to the maximum value at an end of the cycle.Type: GrantFiled: August 21, 2019Date of Patent: September 8, 2020Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Laiqing Ping, Nan Shi, Xiaoyan Wang
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Patent number: 10624162Abstract: A direct AC LED lighting device is provided with a variable current source and a controller. The controller controls the variable current source to conduct a THD compensation current while an LED string in the direct AC lighting device is not conducting to improve power factor and reduce the THD.Type: GrantFiled: March 21, 2018Date of Patent: April 14, 2020Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Nan Shi, Haiju Li
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Publication number: 20200025425Abstract: Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.Type: ApplicationFiled: June 25, 2019Publication date: January 23, 2020Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Jyotirmoy Mandal, Adam Overvig, Norman Nan Shi, Meng Tian
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Patent number: 10531531Abstract: A system and method for controlling a light output from a LED-based lighting solution is provided that may receive phase-cut AC signals and/or external digital control signals. The invention is capable of receiving both a phase-cut AC signal and an external digital control signal simultaneously and providing a desired light output from a LED-based lighting solution. The system generally includes a power source electronically connected to one or more dimmers and an AC power output of the dimmer connected to a solid state lighting device such as an LED. The system is capable of receiving signals from a wired and/or wireless external digital control device to additionally control the desired light output from a LED-based lighting solution.Type: GrantFiled: January 5, 2017Date of Patent: January 7, 2020Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Xiaoyan Wang, Nan Shi
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Publication number: 20190297695Abstract: A direct AC LED lighting device is provided with a variable current source and a controller. The controller controls the variable current source to conduct a THD compensation current while an LED string in the direct AC lighting device is not conducting to improve power factor and reduce the THD.Type: ApplicationFiled: March 21, 2018Publication date: September 26, 2019Inventors: Nan Shi, Haiju Li
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Patent number: 10405392Abstract: A direct AC LED lighting device is provided with a controller that switches off a bleeder circuit following an initial rising edge for a post diode bridge voltage. The controller measures a first delay between a zero crossing for the post diode bridge voltage and the initial rising edge to estimate a triggering voltage for a leading edge dimmer switch. The controller determines a second delay following the initial rising edge responsive to the estimate of the triggering voltage. The controller may thus switch on the bleeder circuit at an expiration of the second delay so that bleeder circuit is only on for a duration sufficient to develop a voltage difference across the leading edge dimmer switch to equal the triggering voltage just as the post diode bridge voltage satisfies an LED threshold voltage.Type: GrantFiled: April 16, 2018Date of Patent: September 3, 2019Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Nan Shi, Haiju Li
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Patent number: 10386097Abstract: Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.Type: GrantFiled: December 18, 2017Date of Patent: August 20, 2019Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Jyotirmoy Mandal, Adam Overvig, Norman Nan Shi, Meng Tian
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Patent number: 10333522Abstract: A single configuration terminal of a device is used to configure multiple operating parameters of the device based on a resistor and a capacitor selectively connected to the configuration terminal. The device includes a detection circuit configured to monitor a voltage signal at the configuration terminal to determine multiple values in response to a regulated current source providing a current to the configuration terminal selectively connected to the resistor and the capacitor in parallel, and configure multiple operating parameters based on the determined values. A method for configuring operating parameters using a single configuration terminal of a device includes providing a current to the configuration terminal selectively connected to a resistor and a capacitor in parallel, monitoring a voltage signal at the configuration terminal, determining multiple values based on the monitoring, and configuring multiple operating parameter based on the determined values.Type: GrantFiled: November 29, 2017Date of Patent: June 25, 2019Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Guang Feng, Xiaoyan Wang, Nan Shi
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Patent number: 10292226Abstract: A direct AC LED lighting device is provided with a low-pass filter for filtering a threshold time in which a post diode bridge voltage exceeds an LED threshold voltage during a current AC half cycle for the post diode bridge voltage.Type: GrantFiled: April 6, 2018Date of Patent: May 14, 2019Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Nan Shi, Haiju Li
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Patent number: 10148170Abstract: A switching power converter is provided that uses at least two peak current thresholds. In particular, the switching power converter clamps a desired peak current to not fall below a low peak current threshold value while a rectified input voltage is decreasing and to not fall below a high peak current threshold value subsequent to zero crossing times for an AC input voltage.Type: GrantFiled: November 28, 2017Date of Patent: December 4, 2018Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Guang Feng, Xiaoyan Wang, Nan Shi
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Patent number: 10129939Abstract: Systems, devices, and methods for dimming of solid state lighting reduce ripple and flicker at low load dimming levels (low LED current, lower light levels) yet provide full power to the load at high load dimming levels (high LED current, higher light levels) thereby reducing power loss compared to conventional dimming techniques. When dimming to lower light levels a flicker resisting metal oxide semiconductor field effect transistor (MOSFET) connected to the LED operates in linear mode such that the relationship of its drain-source voltage to the LED current is resistive to provide flicker reduction. Conversely, at higher light levels the flicker resisting MOSFET is operated in saturation mode such that full power is supplied to the LED as flicker reduction is less needed. The disclosed techniques also reduce undershoot and overshoot of the LED voltage during transitions in dimming control from high to low and low to high respectively.Type: GrantFiled: July 10, 2017Date of Patent: November 13, 2018Assignee: DIALOG SEMICONDUCTOR INC.Inventors: Chenglong Zhang, Nan Shi
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Patent number: 10042008Abstract: A power supply detection system and method for determining the AC mains voltage range when a device (e.g., LED based bulbs) is indirectly connected to the AC mains and the device does not receive the complete sinusoidal AC mains signal. The power supply detection system and method receive an input signal having a first portion that is a sinusoidal signal that generally corresponds to a first portion of the voltage source signal and a second portion that is not a sinusoidal signal that generally corresponds to a second portion of the voltage source signal. A selected reference signal is received, wherein the selected reference signal is synchronized with the input signal. The first portion of the input signal is compared with a corresponding portion of the selected reference signal, and the voltage range of the voltage source is determined based on the comparison.Type: GrantFiled: September 15, 2014Date of Patent: August 7, 2018Assignee: Dialog Semiconductor Inc.Inventors: Xiaoyan Wang, Nan Shi, Clarita C. Knoll
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Publication number: 20180180331Abstract: Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.Type: ApplicationFiled: December 18, 2017Publication date: June 28, 2018Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Jyotirmoy Mandal, Adam Overvig, Norman Nan Shi
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Patent number: 9936547Abstract: A multi-mode control scheme for an LED lamp system uses the detected firing angle of an AC input voltage waveform to select from multiple regulation modes. In operation, a current controller compares the detected firing angle to one or more specified thresholds and selects the appropriate regulation scheme based on the comparison result. When the detected firing angle is less than a first firing angle threshold, the controller employs a current shaping regulation mode. When the detected firing angle is greater than a second firing angle threshold, the controller employs a switching cycle-I Peak modulation regulation mode. And when the detected firing angle is greater than the first firing angle threshold and less than the second firing angle threshold, the controller employs a hybrid regulation mode.Type: GrantFiled: September 15, 2015Date of Patent: April 3, 2018Assignee: Dialog Semiconductor Inc.Inventors: Xiaoyan Wang, Guang Feng, Nan Shi
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Publication number: 20180091041Abstract: A switching power converter is provided that uses at least two peak current thresholds. In particular, the switching power converter clamps a desired peak current to not fall below a low peak current threshold value while a rectified input voltage is decreasing and to not fall below a high peak current threshold value subsequent to zero crossing times for an AC input voltage.Type: ApplicationFiled: November 28, 2017Publication date: March 29, 2018Inventors: Guang Feng, Xiaoyan Wang, Nan Shi
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Publication number: 20180083636Abstract: A single configuration terminal of a device is used to configure multiple operating parameters of the device based on a resistor and a capacitor selectively connected to the configuration terminal. The device includes a detection circuit configured to monitor a voltage signal at the configuration terminal to determine multiple values in response to a regulated current source providing a current to the configuration terminal selectively connected to the resistor and the capacitor in parallel, and configure multiple operating parameters based on the determined values. A method for configuring operating parameters using a single configuration terminal of a device includes providing a current to the configuration terminal selectively connected to a resistor and a capacitor in parallel, monitoring a voltage signal at the configuration terminal, determining multiple values based on the monitoring, and configuring multiple operating parameter based on the determined values.Type: ApplicationFiled: November 29, 2017Publication date: March 22, 2018Inventors: Guang Feng, Xiaoyan Wang, Nan Shi
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Patent number: 9877367Abstract: An LED lamp comprises one or more LEDs and an LED driver receiving an input signal from a dimmer switch indicative of an amount of dimming for the LED lamp. The LED driver controls regulated current through the one or more LEDs based on the input signal such that an output light intensity of the one or more LEDs substantially corresponds to the amount of dimming for the LED lamp. A regulated output provides operating power for the LED driver. A controller regulates the regulated output to power the LED driver. The controller selects a power source for charging the regulated output from two or more power sources, and the regulated output is charged using the power source selected by the controller.Type: GrantFiled: April 26, 2017Date of Patent: January 23, 2018Assignee: Dialog Semiconductor Inc.Inventors: Chuanyang Wang, Chenglong Zhang, Nan Shi, Clarita C. Knoll, Guang Feng