Patents by Inventor Junhu LIU

Junhu LIU 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: 10537010
    Abstract: The invention describes a coded light modulation arrangement (1), adapted to be connected between a driver (31) and a LED (3), which coded light modulation arrangement (1) comprises input terminals (10) adapted to connect to the driver (31) and to receive a drive current (IDRIVE), an energy storage arrangement comprising a number of energy storage devices (E1, E2); a data input interface (12) realized to receive a data stream (D), said data stream (D) comprises a sequence of binary symbols comprising a logic high and a logic low; a switch arrangement comprising a number of switches (S1, S2) arranged to connect the energy storage devices (E1, E2) of the energy storage arrangement and to modulate the drive current such that, in a charging switch configuration corresponding to the logic low, a negative modulation current (INEG) is diverted from a drive current (IDRIVE) of the LED (3) to the energy storage arrangement; and, in a discharging switch configuration corresponding to the logic high, a positive modulati
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: January 14, 2020
    Assignee: SIGNIFY HOLDING B.V.
    Inventors: Junhu Liu, Zhi Quan Chen, Biwen Xu, Gang G. Wang, Gang K. Wang
  • Publication number: 20190342979
    Abstract: The invention describes a coded light modulation arrangement (1), adapted to be connected between a driver (31) and a LED (3), which coded light modulation arrangement (1) comprises input terminals (10) adapted to connect to the driver (31) and to receive a drive current (IDRIVE), an energy storage arrangement comprising a number of energy storage devices (E1, E2); a data input interface (12) realized to receive a data stream (D), said data stream (D) comprises a sequence of binary symbols comprising a logic high and a logic low; a switch arrangement comprising a number of switches (S1, S2) arranged to connect the energy storage devices (E1, E2) of the energy storage arrangement and to modulate the drive current such that, in a charging switch configuration corresponding to the logic low, a negative modulation current (INEG) is diverted from a drive current (IDRIVE) of the LED (3) to the energy storage arrangement; and, in a discharging switch configuration corresponding to the logic high, a positive modulati
    Type: Application
    Filed: November 28, 2016
    Publication date: November 7, 2019
    Applicant: Philips Lighting Holding B.V.
    Inventors: Junhu LIU, Zhi Quan CHEN, Biwen XU, Gang G. WANG, Gang K. WANG
  • Publication number: 20190068280
    Abstract: A coded light transmission and reception circuit and transmission and reception method use signals to indicate the start and end of a coded light transmission window. Data is modulated onto the current waveform during the transmission window. Each data peak value during said transmission window exceeds an average current in the transmission window (which is used as the decision level) and each valley value during said transmission window is below the average current. In this way, a coded light output can be generated in which the overall decision current varies significantly, but the coded light signal can still be decoded reliably. The average level can be calculated in the receiver and used for demodulating.
    Type: Application
    Filed: January 25, 2017
    Publication date: February 28, 2019
    Inventors: JUNHU LIU, LIANG SHI, JIE FU
  • Patent number: 10154553
    Abstract: An LED driver uses a switch mode power supply either to provide a regulated LED current (in a first mode) that connects directly to the LED arrangement or a regulated LED voltage (in a second mode) to an LED output terminal. An auxiliary power supply is either based on an auxiliary secondary side (i.e. an auxiliary secondary side winding) when in the first mode, or it is based on the regulated LED voltage when in the second mode. The LED driver further comprises an input adapted to receive a standby command for the driver, wherein the main controlling unit is adapted to control the driver in the second mode when receiving the standby command for the driver. In this way, the driver has a single shared stage which can operated in a regulated current (i.e. constant current) mode to drive the LED arrangement directly or a regulated voltage (i.e. constant voltage) mode. It can adaptively change between modes to improve the standby power efficiency. When the load is turned on (e.g.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: December 11, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Junhu Liu, Xianhui Zhang, Chun Yang
  • Patent number: 10141842
    Abstract: The invention provides a power converter comprising: an input for receiving input power with a variable nominal mains level, wherein said variable nominal mains level falls within at least 90V to 240V; a main power switch (Q1) driven by the input power, and a control circuit (Q2, Q3) for controlling a control current of the main power switch (Q1), wherein the control circuit in (Q2, Q3) is adapted to sense the level of the input power and draw current from a control terminal of the power switch (Q1) according to the level, and said control circuit is adapted to operate in linear region and increase the drawn current along with the increase of the level throughout the variable nominal mains level of the input power, wherein the control circuit comprises: a Darlington bridge with a first transistor (Q2) and a second transistor (Q3), the first transistor (Q2) with a base terminal connected to a circuit position indicative of the voltage amplitude of the input power, the second transistor (Q3) with a base termina
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: November 27, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Xianhui Zhang, Ken K. Li, Zhi Quan Chen, Junhu Liu, Ace Li
  • Publication number: 20180241307
    Abstract: The invention provides a power converter comprising: an input for receiving input power with a variable nominal mains level, wherein said variable nominal mains level falls within at least 90V to 240V; a main power switch (Q1) driven by the input power, and a control circuit (Q2, Q3) for controlling a control current of the main power switch (Q1), wherein the control circuit in (Q2, Q3) is adapted to sense the level of the input power and draw current from a control terminal of the power switch (Q1) according to the level, and said control circuit is adapted to operate in linear region and increase the drawn current along with the increase of the level throughout the variable nominal mains level of the input power, wherein the control circuit comprises: a Darlington bridge with a first transistor (Q2) and a second transistor (Q3), the first transistor (Q2) with a base terminal connected to a circuit position indicative of the voltage amplitude of the input power, the second transistor (Q3) with a base termina
    Type: Application
    Filed: June 29, 2016
    Publication date: August 23, 2018
    Inventors: XIANHUI ZHANG, KEN K. LI, ZHI QUAN CHEN, JUNHU LIU, ACE LI
  • Publication number: 20180177010
    Abstract: An LED driver uses a switch mode power supply either to provide a regulated LED current (in a first mode) that connects directly to the LED arrangement or a regulated LED voltage (in a second mode) to an LED output terminal. An auxiliary power supply is either based on an auxiliary secondary side (i.e. an auxiliary secondary side winding) when in the first mode, or it is based on the regulated LED voltage when in the second mode. The LED driver further comprises an input adapted to receive a standby command for the driver, wherein the main controlling unit is adapted to control the driver in the second mode when receiving the standby command for the driver. In this way, the driver has a single shared stage which can operated in a regulated current (i.e. constant current) mode to drive the LED arrangement directly or a regulated voltage (i.e. constant voltage) mode. It can adaptively change between modes to improve the standby power efficiency. When the load is turned on (e.g.
    Type: Application
    Filed: May 25, 2016
    Publication date: June 21, 2018
    Inventors: JUNHU LIU, XIANHUI ZHANG, CHUN YANG
  • Publication number: 20170231044
    Abstract: A driver is able to drive an analog interface module or a digital interface module, for example an LED module. A set of output pins is for connection to the module, with the same set of output pins used for an analog interface LED module as for a digital interface LED module. A detecting circuit detects whether the module is an analog module or a digital module, based on a signal at a control pin. The configuration of the driver is then set accordingly using an analog drive signal or using a digital communication interface for the LED module parameter collection.
    Type: Application
    Filed: August 10, 2015
    Publication date: August 10, 2017
    Inventors: Junhu LIU, Xiao SUN, Shan WANG, Xinghua HU
  • Patent number: 9648689
    Abstract: The invention relates to a drive unit for a lighting element and an operating method for such drive unit and to a lighting element including such drive unit. By selectively providing power to a control unit of the drive unit using different voltages at different stages of the overall drive unit, there is an additional degree of freedom which may be used for improving power efficiency, in particular for reducing standby power consumption, while still meeting specific space and cost constraints.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: May 9, 2017
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Junhu Liu, Harald Josef Gunther Radermacher, Jie Fu, Xiao Sun
  • Patent number: 9609703
    Abstract: A lighting controller and method has light sources which are activated for a respective lighting duration in a repeating non-overlapping sequence. The end of the lighting duration for one light source is detected for triggering the switching on of the next light source in the sequence. This provides non-overlapping control of the light sources and provides an efficient and easy to implement the required controller.
    Type: Grant
    Filed: November 6, 2014
    Date of Patent: March 28, 2017
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Xianhui Zhang, Marco Haverlag, Jie Fu, Shan Wang, Shu Xu, Peter Alexander Duine, Herman Johannes Gertrudis Gielen, Junhu Liu
  • Publication number: 20160255687
    Abstract: A lighting controller and method has light sources which are activated for a respective lighting duration in a repeating non-overlapping sequence. The end of the lighting duration for one light source is detected for triggering the switching on of the next light source in the sequence. This provides non-overlapping control of the light sources and provides an efficient and easy to implement the required controller.
    Type: Application
    Filed: November 6, 2014
    Publication date: September 1, 2016
    Applicant: Koninklijke Philips N.V.
    Inventors: XIANHUI ZHANG, MARCO HAVERLAG, JIE FU, SHAN WANG, SHU XU, PETER ALEXANDER DUINE, HERMAN JOHANNES GERTRUDIS GIELEN, JUNHU LIU
  • Publication number: 20160234902
    Abstract: The invention relates to a drive unit for a lighting element and an operating method for such drive unit and to a lighting element including such drive unit. By selectively providing power to a control unit of the drive unit using different voltages at different stages of the overall drive unit, there is an additional degree of freedom which may be used for improving power efficiency, in particular for reducing standby power consumption, while still meeting specific space and cost constraints.
    Type: Application
    Filed: October 14, 2014
    Publication date: August 11, 2016
    Inventors: Junhu LIU, Harald Josef Gunther RADERMACHER, Jie FU, Xiao SUN