Patents by Inventor Chung-Lung Pai

Chung-Lung Pai 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: 9041374
    Abstract: A power converting circuit includes an upper gate switch, a transistor, a current source circuit, a comparator circuit, a delay circuit, and a pulse width modulation signal generating circuit. The transistor and the current source circuit provide a reference signal. The comparator circuit generates a comparing signal according to the reference signal and an output signal provided by the upper gate switch. The delay circuit generates a delay signal according to the comparing signal and a clock signal. The pulse width modulation signal generating circuit generates a control signal for the upper gate switch according to the delay signal and the clock signal for configuring the conduction status of the upper gate switch. The power converting circuit adjusts the conduction time of the upper gate switch according to the reference signal and the output signal.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: May 26, 2015
    Assignee: RICHTEK TECHNOLOGY CORPORATION
    Inventors: Hung-Yu Cheng, Chung-Lung Pai, Tzu Huan Chiu, Chien-Ping Lu
  • Publication number: 20140266133
    Abstract: A power converting circuit includes an upper gate switch, a transistor, a current source circuit, a comparator circuit, a delay circuit, and a pulse width modulation signal generating circuit. The transistor and the current source circuit provide a reference signal. The comparator circuit generates a comparing signal according to the reference signal and an output signal provided by the upper gate switch. The delay circuit generates a delay signal according to the comparing signal and a clock signal. The pulse width modulation signal generating circuit generates a control signal for the upper gate switch according to the delay signal and the clock signal for configuring the conduction status of the upper gate switch. The power converting circuit adjusts the conduction time of the upper gate switch according to the reference signal and the output signal.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Applicant: Richtek Technology Corporation
    Inventors: Hung-Yu CHENG, Chung-Lung PAI, Tzu Huan CHIU, Chien-Ping LU
  • Publication number: 20140210439
    Abstract: The present invention discloses a switching regulator and a control circuit thereof. The switching regulator includes a boost or buck-boost power stage, a first operation circuit and a bypass circuit. The power stage controls at least one power transistor switch included therein according to a first operation signal, to convert an input voltage to an output voltage at an output terminal. The first operation circuit generates the first operation signal in response to the output voltage or a related signal thereof. The bypass circuit includes a bypass transistor and a second operation circuit. When it is required to provide power to the output terminal promptly, the second operation circuit turns ON the bypass transistor, and when the input voltage is equal to the output voltage or equal to a sum of the output voltage plus a safety offset value, the second operation circuit turns OFF the bypass transistor.
    Type: Application
    Filed: January 29, 2013
    Publication date: July 31, 2014
    Inventors: Tzu-Huan Chiu, Chung-Lung Pai, Hung-Yu Cheng, Shuo-Wen Chang
  • Publication number: 20120112717
    Abstract: The present invention discloses a power supply comprising: a switching regulator circuit converting an input voltage to an intermediate voltage; a low dropout linear regulator circuit converting the intermediate voltage to an output voltage so as to supply a load current to a load; and a feedback control circuit which increases the noise filtering effect of the low dropout linear regulator circuit when the load current increases.
    Type: Application
    Filed: January 18, 2012
    Publication date: May 10, 2012
    Inventors: Jing-Meng Liu, Chung-Lung Pai, Wei-Che Chiu
  • Patent number: 8125204
    Abstract: The present invention discloses a power supply comprising: a switching regulator circuit converting an input voltage to an intermediate voltage; a low dropout linear regulator circuit converting the intermediate voltage to an output voltage so as to supply a load current to a load; and a feedback control circuit which increases the noise filtering effect of the low dropout linear regulator circuit when the load current increases.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: February 28, 2012
    Assignee: Richtek Technology Corporation
    Inventors: Jing-Meng Liu, Chung-Lung Pai, Wei-Che Chiu
  • Patent number: 8022672
    Abstract: The present invention discloses a charger control circuit and a charger control method for controlling a charger having a transformer, the transformer including a primary winding and a secondary winding. The charger control circuit comprises: a power switch coupled to the primary winding; a switch control circuit controlling the operation of the power switch; and a detection circuit which generates a signal according to a voltage at a node between the power switch and the primary winding, and supplies the signal to the switch control circuit.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: September 20, 2011
    Assignee: Richtek Technology Corporation
    Inventors: Chung-Lung Pai, Shih-Hui Chen
  • Patent number: 7751471
    Abstract: A pulse width modulation (PWM) Regulator System with automatically switching pulse skipping mode (PSM) is disclosed. The PWM regulator system comprises a PWM regulator, a PSM switching module and a pulse generator. The PWM regulator converts the input voltage by PWM. The PSM switching module determines to enter or exit the PSM. The pulse generator adaptively produces pulse signal for the switching regulator to operate in PSM.
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: July 6, 2010
    Assignee: Richtek Technology Corp.
    Inventors: Kwan-Jen Chu, Chung-Lung Pai, Po-Shun Chung, Jing-Meng Liu
  • Patent number: 7746926
    Abstract: A pulse width modulation (PWM) Regulator System with automatically switching pulse skipping mode (PSM) is disclosed. The PWM regulator system comprises a PWM regulator, a PSM switching module and a pulse generator. The PWM regulator converts the input voltage by PWM. The PSM switching module determines to enter or exit the PSM. The pulse generator adaptively produces pulse signal for the switching regulator to operate in PSM.
    Type: Grant
    Filed: November 15, 2005
    Date of Patent: June 29, 2010
    Assignee: Richtek Technology Corp.
    Inventors: Kwan-Jen Chu, Chung-Lung Pai, Po-Shun Chung, Jing-Meng Liu
  • Patent number: 7728529
    Abstract: In a LED driver using a depletion mode transistor to serve as a current source, the depletion mode transistor is self-biased for providing a driving current to drive at least one LED, thereby requesting no additional control circuit to control the depletion mode transistor. The driving current is independent on the supply voltage coupled to the at least one LED, thereby requesting no additional voltage regulator, reducing the circuit size, and lowering the cost.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: June 1, 2010
    Assignee: Richtek Technology Corporation, R.O.C.
    Inventors: Jing-Meng Liu, Chung-Lung Pai, Hung-Der Su
  • Patent number: 7656133
    Abstract: In a capacitor charger including a transformer having a primary winding connected with an input voltage and a secondary winding for transforming a primary current flowing through the primary winding to a secondary current flowing through the secondary winding, the primary current is adjusted according to a monitoring voltage varying with the input voltage, thereby prolonging the lifetime of the battery that provides the input voltage and improving the power efficiency of the battery.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: February 2, 2010
    Assignee: Richtek Technology Corp.
    Inventors: Chung-Lung Pai, Kwan-Jen Chu, Chun-Yen Huang, Jing-Meng Liu
  • Patent number: 7619394
    Abstract: In a capacitor charger including a transformer having a primary winding connected with an input voltage and a secondary winding for transforming a primary current flowing through the primary winding to a secondary current flowing through the secondary winding, the primary current is adjusted according to a monitoring voltage varying with the input voltage, thereby prolonging the lifetime of the battery that provides the input voltage and improving the power efficiency of the battery.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: November 17, 2009
    Assignee: Richtek Technology Corp.
    Inventors: Chung-Lung Pai, Kwan-Jen Chu, Chun-Yen Huang, Jing-Meng Liu
  • Publication number: 20090243551
    Abstract: The present invention discloses a charger control circuit and a charger control method for controlling a charger having a transformer, the transformer including a primary winding and a secondary winding. The charger control circuit comprises: a power switch coupled to the primary winding; a switch control circuit controlling the operation of the power switch; and a detection circuit which generates a signal according to a voltage at a node between the power switch and the primary winding, and supplies the signal to the switch control circuit.
    Type: Application
    Filed: February 11, 2009
    Publication date: October 1, 2009
    Inventors: Chung-Lung Pai, Shih-Hui Chen
  • Publication number: 20090195221
    Abstract: In a capacitor charger including a transformer having a primary winding connected with an input voltage and a secondary winding for transforming a primary current flowing through the primary winding to a secondary current flowing through the secondary winding, the primary current is adjusted according to a monitoring voltage varying with the input voltage, thereby prolonging the lifetime of the battery that provides the input voltage and improving the power efficiency of the battery.
    Type: Application
    Filed: March 30, 2009
    Publication date: August 6, 2009
    Inventors: Chung-Lung Pai, Kwan-Jen Chu, Chun-Yen Huang, Jing-Meng Liu
  • Publication number: 20090115389
    Abstract: A pulse width modulation (PWM) Regulator System with automatically switching pulse skipping mode (PSM) is disclosed. The PWM regulator system comprises a PWM regulator, a PSM switching module and a pulse generator. The PWM regulator converts the input voltage by PWM. The PSM switching module determines to enter or exit the PSM. The pulse generator adaptively produces pulse signal for the switching regulator to operate in PSM.
    Type: Application
    Filed: January 6, 2009
    Publication date: May 7, 2009
    Inventors: Kwan-Jen Chu, Chung-Lung Pai, Po-Shun Chung, Jing-Meng Liu
  • Patent number: 7518888
    Abstract: In a fly-back voltage converter that includes a transformer to transform a primary current to a secondary current and a switch serially coupled to the primary winding to switch the primary current in response to a control signal, a detection signal is produced by comparing the secondary current with two threshold values after the primary current is switched off to trigger the next on-time cycle of the switch. Once the secondary current is detected to be greater than a first threshold value, it is determined that the secondary current has been switched on, and until the secondary current is detected to be lower than a second threshold value, it is determined that the secondary current is to be switched off. The hysteresis range of the threshold values prevents error detection of the secondary current.
    Type: Grant
    Filed: May 2, 2006
    Date of Patent: April 14, 2009
    Assignee: Richtek Technology Corp.
    Inventors: Kwan-Jen Chu, Chung-Lung Pai, Yuan-Huang Cheng, Jing-Meng Liu
  • Patent number: 7411379
    Abstract: In an apparatus for over-voltage and over-current protection for a step-up current-mode converter including an inductor connected via a phase node to a switch that is switched by a control signal to convert an input voltage to an output voltage, a controller has a multiplexed pin, and a resistor and a capacitor are connected in parallel between the multiplexed pin and the phase node. In an over-voltage protection mode, the controller senses the voltage on the multiplexed pin, and in an over-current protection mode, the controller supplies a current to flow through the resistor and senses the voltage on the multiplexed pin.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: August 12, 2008
    Assignee: Richtek Technology Corp.
    Inventors: Kwan-Jen Chu, Chung-Lung Pai, Chun-Chin Tung, Jing-Meng Liu
  • Patent number: 7411316
    Abstract: A dual-input power converter comprises two power stages using a common low-side element, a first input for coupling a first input voltage to the first power stage, a second input for coupling a second input voltage to the second power stage, and a controller for driving the first and second power stages to convert the first or second input voltage to an output voltage.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: August 12, 2008
    Assignee: Richtek Technology Corp.
    Inventor: Chung-Lung Pai
  • Publication number: 20080180073
    Abstract: The present invention discloses a power supply comprising: a switching regulator circuit converting an input voltage to an intermediate voltage; a low dropout linear regulator circuit converting the intermediate voltage to an output voltage so as to supply a load current to a load; and a feedback control circuit which increases the noise filtering effect of the low dropout linear regulator circuit when the load current increases.
    Type: Application
    Filed: January 10, 2008
    Publication date: July 31, 2008
    Inventors: Jing-Meng Liu, Chung-Lung Pai, Wei-Che Chiu
  • Patent number: 7388409
    Abstract: An offset current independent sense circuit is switchable between a store state and a sense state. In the store state, the sense circuit stores an offset current to a capacitor, and the influence of the offset current is eliminated by a transistor to regenerate the offset current based on a signal provided by the capacitor in the sense state.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: June 17, 2008
    Assignee: Richtek Technology Corp.
    Inventor: Chung-Lung Pai
  • Patent number: 7327124
    Abstract: A plurality of switches, an inductor and two capacitors are configured to be a boost-inverting converter. To operate the converter in a boost-inverting mode, a control apparatus and method switch the switches such that the inductor is energized in a first phase, the first capacitor is discharged to produce an inverting voltage in a second phase, and the capacitor Cout1 is discharged to produce the inverting voltage and the second capacitor is charged to produce a boost voltage in a third phase. Therefore, the boost-inverting converter has lower peak inductor current and less power loss, and the limitation to the switch design for the boost-inverting converter is relaxed.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: February 5, 2008
    Assignee: Richtek Technology Corp.
    Inventors: Jing-Meng Liu, Chung-Lung Pai, Hung-Der Su, Wei-Hsin Wei