Patents by Inventor Zhi Quan Chen

Zhi Quan 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).

  • Publication number: 20200068678
    Abstract: There is proposed an interface circuit for connecting an electronic ballast to a lighting arrangement, in which control of a coupling configuration of the interface circuit is dependent upon a frequency of the electronic ballast. In particular, a coupling configuration of the interface circuit is controlled by a control arrangement based on the ballast frequency.
    Type: Application
    Filed: March 1, 2018
    Publication date: February 27, 2020
    Inventors: XIANHUI ZHANG, DEREK ZHENG, ZHI QUAN CHEN, HUOJUN LONG, WEN RAN, HAIMIN TAO
  • 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
  • Patent number: 10334669
    Abstract: A lighting circuit uses a tapped linear driver architecture in which there are at least two LED types; a first LED type with a first forward voltage, and a second LED type with a second forward voltage at least double the first forward voltage. The first segment of the tapped linear driver comprises more LEDs of the first type than the second type and the last segment comprises more LEDs of the second type than the first type. This arrangement enables a reduction in the number of LEDs needed, but without significantly impacting on the efficiency of the circuit.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: June 25, 2019
    Assignee: SIGNIFY HOLDING B.V.
    Inventors: Shan Wang, Chun Yang, Zhi Quan Chen, Gang Wang, Jie Fu
  • Patent number: 10326374
    Abstract: Presented is a converter circuit having main switching circuiton a primary side of a transformer, for controlling supply of a current to a storage inductor on the primary side when the main switching circuit is conductive. The convertor circuit comprises: a control circuit operatively coupled to the main switching circuit and for controlling the main switching circuit, the control circuit comprising a control capacitor adapted to enable the control circuit and turn off the main switching circuit; an auxiliary inductor magnetically coupled to the storage inductor and adapted to trigger the control circuit to operate and turn off the main switching circuit in response to a voltage change in the storage inductor when the main switching circuit being conductive; and a charging circuit coupled between the auxiliary inductor and the control capacitor and adapted to enable the auxiliary inductor to charge the control capacitor.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: June 18, 2019
    Assignee: SIGNIFY HOLDING B.V.
    Inventor: Zhi Quan Chen
  • Publication number: 20180352621
    Abstract: A lighting circuit uses a tapped linear driver architecture in which there are at least two LED types; a first LED type with a first forward voltage, and a second LED type with a second forward voltage at least double the first forward voltage. The first segment of the tapped linear driver comprises more LEDs of the first type than the second type and the last segment comprises more LEDs of the second type than the first type. This arrangement enables a reduction in the number of LEDs needed, but without significantly impacting on the efficiency of the circuit.
    Type: Application
    Filed: March 15, 2018
    Publication date: December 6, 2018
    Inventors: SHAN WANG, CHUN YANG, ZHI QUAN CHEN, GANG WANG, JIE FU
  • 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: 20180234019
    Abstract: Presented is a converter circuit having main switching circuiton a primary side of a transformer, for controlling supply of a current to a storage inductor on the primary side when the main switching circuit is conductive. The convertor circuit comprises: a control circuit operatively coupled to the main switching circuit and for controlling the main switching circuit, the control circuit comprising a control capacitor adapted to enable the control circuit and turn off the main switching circuit; an auxiliary inductor magnetically coupled to the storage inductor and adapted to trigger the control circuit to operate and turn off the main switching circuit in response to a voltage change in the storage inductor when the main switching circuit being conductive; and a charging circuit coupled between the auxiliary inductor and the control capacitor and adapted to enable the auxiliary inductor to charge the control capacitor.
    Type: Application
    Filed: August 27, 2015
    Publication date: August 16, 2018
    Inventor: ZHI QUAN CHEN
  • Patent number: 9894722
    Abstract: Driver with open output protection Starting current for a load driver (200; 300) for driving a load (L) is provided via the load. In a load driver (200; 300) for driving a load (L), an operating current or an operating voltage at a reference point is derived from a power voltage bus (105; 305) by coupling said reference point to said power voltage bus via the load. A load driver (200; 300) for driving a load (L) comprises an output capacitor (125; 325) and two output terminals (128, 129; 328, 329) coupled to the output capacitor. A coupling diode (202; 325) is coupled in forward connection from one output terminal to a terminal of the output buffer capacitor. A startup terminal (111) of a converter circuit (110) is coupled to said one output terminal (129; 329) to receive a startup current (Is) via the driven load if the load is present to conduct this current.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: February 13, 2018
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Zhi Quan Chen, Kang Li
  • Publication number: 20170196053
    Abstract: Driver with open output protection Starting current for a load driver (200; 300) for driving a load (L) is provided via the load. In a load driver (200; 300) for driving a load (L), an operating current or an operating voltage at a reference point is derived from a power voltage bus (105; 305) by coupling said reference point to said power voltage bus via the load. A load driver (200; 300) for driving a load (L) comprises an output capacitor (125; 325) and two output terminals (128, 129; 328, 329) coupled to the output capacitor. A coupling diode (202; 325) is coupled in forward connection from one output terminal to a terminal of the output buffer capacitor. A startup terminal (111) of a converter circuit (110) is coupled to said one output terminal (129; 329) to receive a startup current (Is)via the driven load if the load is present to conduct this current.
    Type: Application
    Filed: October 24, 2014
    Publication date: July 6, 2017
    Inventors: Zhi Quan CHEN, Kang LI
  • Patent number: 9651730
    Abstract: Disclosed is a lighting device comprising an exit window (30); a plurality of solid state lighting elements (20) arranged in an annular pattern; an optical element (10, 50) for redirecting the luminous output of the solid state lighting elements towards said exit window, the shape of said optical element defining a cavity (15) on a central axis of the lighting device, said cavity being shielded from said luminous output; and a driver circuit (40) for driving at least some of said solid state lighting elements located in said cavity. A luminaire including such a lighting device is also disclosed.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: May 16, 2017
    Assignee: PHILIPS LIGHTING HOLDING B.V.
    Inventors: Lei Sui, Zhi Quan Chen, Huaizhou Liao, Feng He
  • Patent number: 9350243
    Abstract: An apparatus (100) includes a buck and boost conversion circuit (110), and a control unit (120, 200) for controlling operations of the buck and boost converter. The buck and boost converter includes a buck conversion circuit having a first set of switches (SW3, SW4), and a boost conversion circuit having a second set of switches (SW5, SW6). The buck conversion circuit and the boost conversion circuit may be controlled independently from each other. The control unit is configured to control delivery of power from the power converter to a load (20) via the buck conversion circuit in a buck conversion mode by controlling switching operations of the first set of switches, and to control the delivery of the power from the power converter to the load via the boost conversion circuit in a boost conversion mode by controlling switching operations of the second set of switches.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: May 24, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Zhi Quan Chen, Jian Lin Xu, Hong Bo Wang, Zhen Hua Zhou
  • Publication number: 20160119987
    Abstract: A load driver for driving a load and an LED module are disclosed. In one embodiment, the load driver comprises a converter circuit comprising a controllable switching element configured to be turned on and off and to perform power factor correction for power from a power supply to the load, wherein a control terminal of the controllable switching element is configured for receiving a startup current via the two output terminals, the controllable switching element configured to be turned on by the startup current. The converter circuit further comprises a first inductor, coupled to the power supply at a first end, and to ground at a second end via the controllable switching element, wherein a first one of the output terminals connects to a second end of the first inductor via a diode forwarded from the first inductor, a second one of the output terminals is coupled to the first end of the first inductor.
    Type: Application
    Filed: March 30, 2015
    Publication date: April 28, 2016
    Inventors: Zhi Quan CHEN, Duo L. Li, Kang LI, Matt J. MA, Hui ZHANG, Dennis Johannes Antonius CLAESSENS
  • Publication number: 20160103268
    Abstract: Disclosed is a lighting device comprising an exit window (30); a plurality of solid state lighting elements (20) arranged in an annular pattern; an optical element (10, 50) for redirecting the luminous output of the solid state lighting elements towards said exit window, the shape of said optical element defining a cavity (15) on a central axis of the lighting device, said cavity being shielded from said luminous output; and a driver circuit (40) for driving at least some of said solid state lighting elements located in said cavity. A luminaire including such a lighting device is also disclosed.
    Type: Application
    Filed: March 12, 2014
    Publication date: April 14, 2016
    Applicant: Koninklijke Philips N.V.
    Inventors: LEI SUI, ZHI QUAN CHEN, HUAIZHOU LIAO, FENG HE
  • Publication number: 20150303803
    Abstract: An apparatus (100) includes a buck and boost conversion circuit (110), and a control unit (120, 200) for controlling operations of the buck and boost converter. The buck and boost converter includes a buck conversion circuit having a first set of switches (SW3, SW4), and a boost conversion circuit having a second set of switches (SW5, SW6). The buck conversion circuit and the boost conversion circuit may be controlled independently from each other. The control unit is configured to control delivery of power from the power converter to a load (20) via the buck conversion circuit in a buck conversion mode by controlling switching operations of the first set of switches, and to control the delivery of the power from the power converter to the load via the boost conversion circuit in a boost conversion mode by controlling switching operations of the second set of switches.
    Type: Application
    Filed: January 4, 2013
    Publication date: October 22, 2015
    Inventors: Zhi Quan CHEN, Jian Lin XU, Hong Bo WANG, Zhen Hua ZHOU
  • Patent number: 6025618
    Abstract: A method of fabricating a complex IC in two parts and making the electrical connections between them afterwards is described. By this method, a ferroelectric RAM is fabricated in two parts, where the first part has an array of unit cells each of those has a transistor or a group of transistors serving the purpose of selecting one address for data recording and has an array of electrically conductive pads facing upward, protruding out from the surface of the first part, where the second part consists of a data-recording layer on another substrate. The data-recording layer consists of ferroelectric material and is pressed on the first part during data writing and reading.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: February 15, 2000
    Inventor: Zhi Quan Chen