Patents by Inventor Yung-Chuan Lu

Yung-Chuan Lu 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: 11646655
    Abstract: A control method for an LLC resonant converter includes the following steps. Firstly, the LLC resonant converter is enabled. Then, the sonant converter is operated in a first modulation mode, so that the magnitude of the output voltage is greater than or equal to an intermediate voltage value. When the magnitude of the output current is greater than zero, a determining step is performed to determine whether the magnitude of the output voltage is greater than a reference voltage value. When the determining result is satisfied, the LLC resonant converter is operated in the first modulation mode. When the determining result is not satisfied, the LLC resonant converter is operated in a second modulation mode, so that the magnitude of the output voltage is lower than the intermediate voltage value.
    Type: Grant
    Filed: July 27, 2021
    Date of Patent: May 9, 2023
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Publication number: 20220271655
    Abstract: A control method for an LLC resonant converter includes the following steps. Firstly, the LLC resonant converter is enabled. Then, the sonant converter is operated in a first modulation mode, so that the magnitude of the output voltage is greater than or equal to an intermediate voltage value. When the magnitude of the output current is greater than zero, a determining step is performed to determine whether the magnitude of the output voltage is greater than a reference voltage value. When the determining result is satisfied, the LLC resonant converter is operated in the first modulation mode. When the determining result is not satisfied, the LLC resonant converter is operated in a second modulation mode, so that the magnitude of the output voltage is lower than the intermediate voltage value.
    Type: Application
    Filed: July 27, 2021
    Publication date: August 25, 2022
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Patent number: 11388800
    Abstract: An operating method for a light-emitting diode (LED) power supply includes the following operations: controlling an output voltage to be a first voltage by a control circuit; detecting a load current by a detection circuit; maintaining the output voltage as the first voltage by a constant voltage control circuit when the load current is greater than zero, changing the output voltage from the first voltage to a second voltage by the control circuit when the load current is equal to zero, and the second voltage being greater than the first voltage.
    Type: Grant
    Filed: April 15, 2020
    Date of Patent: July 12, 2022
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Publication number: 20210092814
    Abstract: An operating method for a light-emitting diode (LED) power supply includes the following operations: controlling an output voltage to be a first voltage by a control circuit; detecting a load current by a detection circuit; maintaining the output voltage as the first voltage by a constant voltage control circuit when the load current is greater than zero, changing the output voltage from the first voltage to a second voltage by the control circuit when the load current is equal to zero, and the second voltage being greater than the first voltage.
    Type: Application
    Filed: April 15, 2020
    Publication date: March 25, 2021
    Inventors: Ching-Ho CHOU, Yung-Chuan LU
  • Patent number: 10152068
    Abstract: An electrical ballast includes an inverter circuit and a detection circuit. The inverter circuit is configured to receive a dc voltage and provide an output voltage to a lighting module. The detection circuit is electrically coupled to the inverter circuit and a voltage source, and configured to detect an ac voltage signal in the inverter circuit, and pull down the voltage source from a supply level to an under voltage locking level to shut down the inverter circuit on the condition that the ac voltage signal is greater than a threshold value, and restart the inverter circuit after a delay period.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: December 11, 2018
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Yung-Chuan Lu, Ching-Ho Chou
  • Publication number: 20180108281
    Abstract: An electronic ballast system for signage light includes a first lamp string, a second lamp string, a first inverter and a second inverter. The first lamp string includes at least one first lamp tube. The second lamp string is connected with the first lamp string in series, and includes at least one second lamp tube. The first inverter is connected with the first lamp string for driving illumination of the first lamp string. The second inverter is connected with the second lamp string for driving illumination of the second lamp string. A frequency difference between a frequency of the first inverter and a frequency of the second inverter is in a range between 500 Hz and 5 kHz.
    Type: Application
    Filed: March 30, 2017
    Publication date: April 19, 2018
    Inventors: Yung-Chuan Lu, Ching-Ho Chou
  • Publication number: 20170142794
    Abstract: A dimmable instant-start ballast for a plurality of LED lamps and/or a plurality of fluorescent lamps is provided, which includes an isolated dimming interface, a duty control device, a dimming switch, and an inverter circuit. The isolated dimming interface receives a dimming signal to generate a dimming voltage. The duty control device generates an operation signal according to the dimming voltage. The dimming switch periodically couples a first node to a ground according to the operation signal. The inverter circuit receives a rectified voltage and is coupled to the first node. When the first node is coupled to the ground terminal, the inverter circuit provides a lamp current for the LED lamps and/or the fluorescent lamps.
    Type: Application
    Filed: April 28, 2016
    Publication date: May 18, 2017
    Inventors: Ching-Ho CHOU, Yung-Chuan LU
  • Patent number: 9648690
    Abstract: A dimmable instant-start ballast for a plurality of LED lamps and/or a plurality of fluorescent lamps is provided, which includes an isolated dimming interface, a duty control device, a dimming switch, and an inverter circuit. The isolated dimming interface receives a dimming signal to generate a dimming voltage. The duty control device generates an operation signal according to the dimming voltage. The dimming switch periodically couples a first node to a ground according to the operation signal. The inverter circuit receives a rectified voltage and is coupled to the first node. When the first node is coupled to the ground terminal, the inverter circuit provides a lamp current for the LED lamps and/or the fluorescent lamps.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: May 9, 2017
    Assignee: Delta Electronics, Inc.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Patent number: 9544980
    Abstract: A driving device provides output power to an illumination device including a plurality of filaments is provided. A first converting module converts input power into direct current (DC) power. The first converting module includes a pair of first input terminals receiving the input power and a pair of first output terminals coupled to a first node and a second node and outputting the DC power. A first capacitor is coupled between the first node and a third node. A second capacitor is coupled between the second and third nodes. The first clamping module is connected to a first specific capacitor in parallel. The first specific capacitor is the first capacitor or the second capacitor. A second converting module converts the DC power to generate the output power.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: January 10, 2017
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Ching Ho Chou, Yung Chuan Lu, Yen Yu Chen
  • Patent number: 9426869
    Abstract: A multi-output electronic ballast is disclosed. The multi-output electronic ballast is used to drive a plurality of lamp assemblies and includes an AC/DC converter, a first inverter, a second inverter, an auxiliary voltage generator, and a control circuit. The AC/DC converter converts an AC input voltage to a high DC voltage. The first inverter converts the high DC input voltage to a first AC voltage selectively. The second inverter converts the high DC voltage to a second AC voltage. The auxiliary voltage generator generates an auxiliary voltage. The control circuit receives the auxiliary voltage generating circuit and outputs a control signal to the first inverter according to the switching operation of a first external switch. When the control signal is transmitted to the first inverter, the first inverter comes into operation and converts the high DC voltage to the first AC voltage.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: August 23, 2016
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Publication number: 20160205755
    Abstract: A driving device provides output power to an illumination device including a plurality of filaments is provided. A first converting module converts input power into direct current (DC) power. The first converting module includes a pair of first input terminals receiving the input power and a pair of first output terminals coupled to a first node and a second node and outputting the DC power. A first capacitor is coupled between the first node and a third node. A second capacitor is coupled between the second and third nodes. The first clamping module is connected to a first specific capacitor in parallel. The first specific capacitor is the first capacitor or the second capacitor. A second converting module converts the DC power to generate the output power.
    Type: Application
    Filed: September 10, 2015
    Publication date: July 14, 2016
    Inventors: CHING HO CHOU, YUNG CHUAN LU, YEN YU CHEN
  • Patent number: 9232619
    Abstract: A fluorescent electronic ballast including: a rectifier circuit, for receiving an AC power supply and converting the AC power supply into a DC power supply; an inverter circuit, coupled to a fluorescent driver circuit, for converting the DC power supply into a high-frequency AC power supply for driving a fluorescent; and a detection protection circuit, coupled to the rectifier circuit and the inverter circuit, for detecting the DC power supply provided by the rectifier circuit, and cutting off the electric connection between a control chip of the inverter circuit and all of power supply when the voltage of the direct current power supply is lower than a predetermined value, wherein the power supply at least includes the direct current power supply provided by the rectifier circuit.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: January 5, 2016
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu, Yen-Yu Chen
  • Publication number: 20150195889
    Abstract: A fluorescent electronic ballast including: a rectifier circuit, for receiving an AC power supply and converting the AC power supply into a DC power supply; an inverter circuit, coupled to a fluorescent driver circuit, for converting the DC power supply into a high-frequency AC power supply for driving a fluorescent; and a detection protection circuit, coupled to the rectifier circuit and the inverter circuit, for detecting the DC power supply provided by the rectifier circuit, and cutting off the electric connection between a control chip of the inverter circuit and all of power supply when the voltage of the direct current power supply is lower than a predetermined value, wherein the power supply at least includes the direct current power supply provided by the rectifier circuit.
    Type: Application
    Filed: May 29, 2014
    Publication date: July 9, 2015
    Applicant: DELTA ELECTRONICS, INC.
    Inventors: Ching-Ho CHOU, Yung-Chuan LU, Yen-Yu CHEN
  • Patent number: 8760059
    Abstract: A current-preheat electronic ballast includes an AC-to-DC converter, a controlling unit, an auxiliary voltage generator, and an inverter. The inverter is connected with the DC bus for converting a high DC voltage into an AC output voltage and generating a resonant current and a lamp filament current to a lamp group. The inverter includes a resonant circuit and a resonant capacitor adjusting circuit. The resonant circuit provides electric energy required to preheat the lamp group. The resonant capacitor adjusting circuit judges whether the inverter is enabled according to the detecting element. After the inverter has been enabled for a delayed time, two high-voltage switching terminals of the resonant capacitor adjusting circuit are correspondingly conducted or shut off, so that an equivalent resonant capacitance value of the resonant circuit is changed and a voltage drop across two ends of a lamp filament of the lamp group is changed.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: June 24, 2014
    Assignee: Delta Electronics, Inc.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Publication number: 20130076244
    Abstract: A current-preheat electronic ballast includes an AC-to-DC converter, a controlling unit, an auxiliary voltage generator, and an inverter. The inverter is connected with the DC bus for converting a high DC voltage into an AC output voltage and generating a resonant current and a lamp filament current to a lamp group. The inverter includes a resonant circuit and a resonant capacitor adjusting circuit. The resonant circuit provides electric energy required to preheat the lamp group. The resonant capacitor adjusting circuit judges whether the inverter is enabled according to the detecting element. After the inverter has been enabled for a delayed time, two high-voltage switching terminals of the resonant capacitor adjusting circuit are correspondingly conducted or shut off, so that an equivalent resonant capacitance value of the resonant circuit is changed and a voltage drop across two ends of a lamp filament of the lamp group is changed.
    Type: Application
    Filed: April 2, 2012
    Publication date: March 28, 2013
    Applicant: DELTA ELECTRONICS, INC.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Patent number: 8378592
    Abstract: The configurations of an end of lamp life protection circuit for a ballast and a method thereof are provided in the present invention. The proposed circuit includes a voltage-dividing circuit receiving an input voltage and outputting a first and a second divided voltages and a switch apparatus raising the first divided voltage when the second divided voltage is less than a first pre-determined threshold value and turning off the ballast when the first divided voltage is higher than a second pre-determined threshold value.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: February 19, 2013
    Assignee: Delta Electronics, Inc.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu, Edy Chandra, Chao-Wei Tsai
  • Publication number: 20120248980
    Abstract: A multi-output electronic ballast is disclosed. The multi-output electronic ballast is used to drive a plurality of lamp assemblies and includes an AC/DC converter, a first inverter, a second inverter, an auxiliary voltage generator, and a control circuit. The AC/DC converter converts an AC input voltage to a high DC voltage. The first inverter converts the high DC input voltage to a first AC voltage selectively. The second inverter converts the high DC voltage to a second AC voltage. The auxiliary voltage generator generates an auxiliary voltage. The control circuit receives the auxiliary voltage generating circuit and outputs a control signal to the first inverter according to the switching operation of a first external switch. When the control signal is transmitted to the first inverter, the first inverter comes into operation and converts the high DC voltage to the first AC voltage.
    Type: Application
    Filed: September 13, 2011
    Publication date: October 4, 2012
    Applicant: DELTA ELECTRONICS, INC.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu
  • Publication number: 20110156592
    Abstract: The configurations of an end of lamp life protection circuit for a ballast and a method thereof are provided in the present invention. The proposed circuit includes a voltage-dividing circuit receiving an input voltage and outputting a first and a second divided voltages and a switch apparatus raising the first divided voltage when the second divided voltage is less than a first pre-determined threshold value and turning off the ballast when the first divided voltage is higher than a second pre-determined threshold value.
    Type: Application
    Filed: December 29, 2010
    Publication date: June 30, 2011
    Applicant: Delta Electronics, Inc.
    Inventors: Ching-Ho Chou, Yung-Chuan Lu, Edy Chandra, Chao-Wei Tsai
  • Publication number: 20070013357
    Abstract: An inverter apparatus is incorporated with a built-in programmable logic-controller (PLC). The PLC includes internal memory for directly outputting control signal to provide inverter operation control without time delay and noise. The inverter apparatus includes external terminals for function assignment and an external program can be coded for expanding the function of the inverter apparatus through the external terminals. The inverter apparatus of the present invention can overcome the problems of limited function and complicated wiring.
    Type: Application
    Filed: July 12, 2005
    Publication date: January 18, 2007
    Inventors: Tai-Tsung Huang, Hsiao-Yuan Wen, Yung-Chuan Lu