Patents by Inventor Naixing Kuang

Naixing Kuang 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: 20200381989
    Abstract: A control circuit having: a logic circuit, configured to provide a high side boot-strap capacitor control signal set and a low side boot-strap capacitor control signal set; a high side boot-strap capacitor control circuit, configured to provide a high side power signal to control a high side power switch; a high side boot-strap capacitor, having a first terminal coupled to a control terminal of the high side power switch, and a second terminal coupled to the high side boot-strap capacitor control circuit; a low side boot-strap capacitor control circuit, configured to provide a low side power signal to control a low side power switch; and a low side boot-strap capacitor, having a first terminal coupled to a control terminal of the low side power switch, and a second terminal coupled to the low side boot-strap capacitor control circuit.
    Type: Application
    Filed: May 12, 2020
    Publication date: December 3, 2020
    Inventor: Naixing Kuang
  • Patent number: 10079537
    Abstract: A resonant converter includes: a rectifier bridge; a first capacitor coupled across output terminals of the rectifier bridge; a diode with its anode coupled to a first terminal of the first capacitor; a second capacitor with a first terminal coupled to the cathode of the diode, and a second terminal coupled to a second terminal of the first capacitor; a first transistor having a first terminal coupled to the first terminal of the second capacitor; a second transistor having a first terminal coupled to a second terminal of the first transistor, and a second terminal coupled to the second terminal of the first capacitor; a resonant tank having a first input terminal coupled to the first terminal of the first capacitor, and a second input terminal coupled to the second terminal of the first transistor and the first terminal of the second transistor; and a rectifying and filtering circuit coupled across output terminals of the resonant tank, and configured to provide an output signal to a load.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: September 18, 2018
    Assignee: Hangzhou MPS Semiconductor Technology Ltd.
    Inventor: Naixing Kuang
  • Patent number: 10021754
    Abstract: A two-channel LED driver with short circuit protection is discussed. A short process circuit monitors a short condition of the LED driver, and locks the short status if short circuit occurs at either one of or both of the channels.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: July 10, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Naixing Kuang, Kai Wang
  • Publication number: 20180183325
    Abstract: A resonant converter includes: a rectifier bridge; a first capacitor coupled across output terminals of the rectifier bridge; a diode with its anode coupled to a first terminal of the first capacitor; a second capacitor with a first terminal coupled to the cathode of the diode, and a second terminal coupled to a second terminal of the first capacitor; a first transistor having a first terminal coupled to the first terminal of the second capacitor; a second transistor having a first terminal coupled to a second terminal of the first transistor, and a second terminal coupled to the second terminal of the first capacitor; a resonant tank having a first input terminal coupled to the first terminal of the first capacitor, and a second input terminal coupled to the second terminal of the first transistor and the first terminal of the second transistor; and a rectifying and filtering circuit coupled across output terminals of the resonant tank, and configured to provide an output signal to a load.
    Type: Application
    Filed: December 18, 2017
    Publication date: June 28, 2018
    Inventor: Naixing Kuang
  • Publication number: 20180132313
    Abstract: A two-channel LED driver with short circuit protection is discussed. A short process circuit monitors a short condition of the LED driver, and locks the short status if short circuit occurs at either one of or both of the channels.
    Type: Application
    Filed: November 6, 2017
    Publication date: May 10, 2018
    Inventors: Naixing Kuang, Kai Wang
  • Patent number: 9936548
    Abstract: A LED driver adopts one power stage to provide a constant drive current to drive a load, and to provide different power supply voltages to power a smart module according to a dimming signal input by users through the smart module. The LED driver provides high performance with simple circuit structure.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: April 3, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Naixing Kuang, Kai Wang, Qiming Zhao
  • Patent number: 9913332
    Abstract: A two-channel LED driver adopts one power stage to provide a constant drive current to drive a first channel LED and a second channel LED, and to provide a power supply voltages to power a smart module. The two-channel LED driver controls the total current flowing through the first channel LED and the second channel LED according to a first dimming signal input by users through the smart module, and controls the dimming ratio between the two channels according to a second dimming signal. The two-channel LED driver provides high performance with simple circuit structure.
    Type: Grant
    Filed: June 21, 2017
    Date of Patent: March 6, 2018
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Naixing Kuang, Kai Wang
  • Publication number: 20180007753
    Abstract: A two-channel LED driver adopts one power stage to provide a constant drive current to drive a first channel LED and a second channel LED, and to provide a power supply voltages to power a smart module. The two-channel LED driver controls the total current flowing through the first channel LED and the second channel LED according to a first dimming signal input by users through the smart module, and controls the dimming ratio between the two channels according to a second dimming signal. The two-channel LED driver provides high performance with simple circuit structure.
    Type: Application
    Filed: June 21, 2017
    Publication date: January 4, 2018
    Inventors: Naixing Kuang, Kai Wang
  • Publication number: 20180007754
    Abstract: A LED driver adopts one power stage to provide a constant drive current to drive a load, and to provide different power supply voltages to power a smart module according to a dimming signal input by users through the smart module. The LED driver provides high performance with simple circuit structure.
    Type: Application
    Filed: June 21, 2017
    Publication date: January 4, 2018
    Inventors: Naixing Kuang, Kai Wang, Qiming Zhao
  • Patent number: 9685876
    Abstract: A method of capacitive mode detection is used in a resonant converter. The resonant converter has a square wave generator having a first switch and a second switch, a resonant network, an isolated transformer having a primary winding and a second winding, and a rectifier network providing an output DC voltage for a load. The method of capacitive mode detection includes: detecting a voltage of the secondary winding and generating a voltage detection signal; detecting an output DC voltage of the rectifier network and generating a voltage detecting threshold; comparing the voltage detection signal with the voltage detection threshold when either of the first and the second switches is turned OFF; generating a flag signal indicating whether the resonant converter enters into a capacitive mode based on the comparison result.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: June 20, 2017
    Assignee: Hangzhou MPS Semiconductor Technology Ltd.
    Inventors: Bairen Liu, Licheng Sheng, Bo Yu, Hongqiang Qin, Qiming Zhao, Naixing Kuang, Eric Yang
  • Patent number: 9661700
    Abstract: A primary control LED driver includes: a switching converter having a main switch and a first winding, and configured to provide an LED driving current; a second winding magnetically coupled to the first winding and configured to provide a power supply voltage at a first terminal; a first sensing resistor with a first terminal coupled to the main switch; a second sensing resistor with a first terminal coupled to the second terminals of the first sensing resistor and the second winding; an output current calculator calculating an equivalent value of the LED driving current based on the voltage at the first terminal of the first sensing resistor; an error amplifier configured to generate a compensation signal based on the equivalent value and a reference voltage; and a control circuit generating a control signal to control the main switch based on the compensation signal.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: May 23, 2017
    Assignee: Hangzhou MPS Semiconductor Technology Ltd.
    Inventors: Naixing Kuang, Qiming Zhao
  • Patent number: 9608510
    Abstract: A switching regulator uses an over voltage comparator to compare an envelop line signal with a reference wave signal, to detect whether the system is in an over voltage condition. The envelop line signal is indicative of a peak value of an inductor current.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: March 28, 2017
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventor: Naixing Kuang
  • Patent number: 9467039
    Abstract: A ripple suppression circuit has a filter circuit and a follower circuit. The filter circuit has a first input terminal coupled to a signal source to receive a ripple signal and an output terminal to output a filter signal which is the sum of the average value of the ripple signal and a positive bias signal. The follower circuit has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is coupled to the signal source to receive the ripple signal, the second input terminal is coupled to the output terminal of the filter circuit to receive the filter signal, the follower circuit provides an output signal at the output terminal, the output signal at least partially follows the filter signal.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: October 11, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Naixing Kuang, Zilin Fan, Yuancheng Ren
  • Patent number: 9449546
    Abstract: A LED driver, a LED driving method and a controller for LED driver are discussed in the present invention. The LED driver detects the phase of the input signal which is phase cut by a triac from a pre-E-transformer. The LED driver regulates the current flowing through the LED strings by varying the phase of the input signal.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: September 20, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Naixing Kuang, Jiaqi Yu, Yuancheng Ren
  • Patent number: 9429970
    Abstract: A power supply system has a current source configured to provide an output current, a load supplied by the current source, and a current ripple suppression circuit. The current ripple suppression circuit has a first end and a second end, wherein the first end of the current ripple suppression circuit is coupled to the load, and the second end of the current ripple suppression circuit is coupled to a reference ground; wherein the current ripple suppression circuit is configured to suppress the current ripple in the output current and adaptively adjust the output current of the current source at a predetermined current level.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: August 30, 2016
    Assignee: CHENGDU MONOLITHIC POWER SYSTEMS CO., LTD.
    Inventors: Naixing Kuang, Jiaqi Yu, Bo Yu
  • Patent number: 9431913
    Abstract: A voltage detecting circuit used with a switching converter. The switching converter having an energy storage component, a first power switch and a second switch. The voltage detecting circuit has a sample and hold circuit configured to sample and hold the voltage at the connection node of the energy storage component and the first power switch when the first power switch is OFF and the second power switch is ON; and an average circuit configured to average the sampled voltage during a switching period to generate a detecting signal in proportional to the output voltage of the switching converter.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: August 30, 2016
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventor: Naixing Kuang
  • Patent number: 9401647
    Abstract: A switching mode power supply, having: a power switch; an energy storage component coupled to the power switch; a current sense resistor configured to generate a current sense signal; a mode select resistor configured to generate a mode select resistor; a ZCD (Zero Cross Detecting) circuit configured to generate a ZCD signal; and a control circuit configured to provide a switch control signal to control the on and off of the power switch, the control circuit having a multi-function pin configured to receive the mode select signal, the current sense signal and the ZCD signal.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: July 26, 2016
    Assignee: Chengdu Monolithic Power Systems Co., Lt.d
    Inventor: Naixing Kuang
  • Patent number: 9398653
    Abstract: The present invention discloses a LED driver including a power stage, an inductor, an error amplifier, a set comparator, a first timer, a logical AND circuit, a reset comparator, a second timer a logical OR circuit, a RS flip flop and a driving circuit. The LED driver provides sufficient latching current for the TRIAC dimmer with no large RC circuit, so as to optimize the dimming and reduce system size.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: July 19, 2016
    Assignee: Chengdu Monolithic Power Systems Co., Ltd.
    Inventors: Naixing Kuang, Zilin Fan
  • Publication number: 20160190945
    Abstract: A method of capacitive mode detection is used in a resonant converter. The resonant converter has a square wave generator having a first switch and a second switch, a resonant network, an isolated transformer having a primary winding and a second winding, and a rectifier network providing an output DC voltage for a load. The method of capacitive mode detection includes: detecting a voltage of the secondary winding and generating a voltage detection signal; detecting an output DC voltage of the rectifier network and generating a voltage detecting threshold; comparing the voltage detection signal with the voltage detection threshold when either of the first and the second switches is turned OFF; generating a flag signal indicating whether the resonant converter enters into a capacitive mode based on the comparison result.
    Type: Application
    Filed: December 18, 2015
    Publication date: June 30, 2016
    Inventors: Bairen Liu, Licheng Sheng, Bo Yu, Hongqiang Qin, Qiming Zhao, Naixing Kuang, Eric Yang
  • Publication number: 20160190941
    Abstract: A switching power supply system has a switching circuit and a control circuit. The control circuit has an integrating circuit providing a charge signal by integrating an output current feedback signal, a charge control circuit, and a switching control circuit controlling the switching circuit based on the charge signal and a charge reference signal. The switching power supply system controls an output current stable via controlling the charge signal, so as to eliminate flicker and shimmer of a LED load with low power loss and simple circuit.
    Type: Application
    Filed: December 16, 2015
    Publication date: June 30, 2016
    Inventor: Naixing Kuang