Patents by Inventor Chih-Lien Chang

Chih-Lien Chang 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: 20210399635
    Abstract: A control circuit of a power converter is coupled to an output stage and controls it to convert an input voltage into an output voltage and generate an output current. The control circuit includes a ripple generation circuit, a synthesis circuit, an error amplifier, a comparator and a PWM circuit. The ripple generation circuit generates a ripple signal according to an input voltage, an output voltage and output current. The synthesis circuit receives the ripple signal and a first feedback signal related to output voltage to provide a second feedback signal. The error amplifier receives the second feedback signal and a reference voltage to generate an error signal. The comparator receives a ramp signal and error signal to generate a comparison signal. The PWM circuit generates a PWM signal to control output stage according to the comparison signal. A slope of ripple signal is changed with the output current.
    Type: Application
    Filed: June 8, 2021
    Publication date: December 23, 2021
    Inventors: Chih-Lien CHANG, Chun-Chieh WANG
  • Patent number: 11075618
    Abstract: A plus width modulation (PWM) signal generator is disclosed. The PWM signal generator includes a first signal generator providing a first signal, an output terminal, a first voltage generating circuit including connected to the first voltage generating circuit for providing a first present voltage according to the first signal, and a second voltage generating circuit connected to the first signal generator for providing a second present voltage according to the first signal. The first present voltage is earlier supplied to the output terminal than the second preset voltage, and after the first preset voltage continuously is provided for a period of preset time, the first voltage generating circuit stops providing the first preset voltage.
    Type: Grant
    Filed: September 10, 2020
    Date of Patent: July 27, 2021
    Assignee: UPI SEMICONDUCTOR CORP.
    Inventors: Chih-Lien Chang, Chia-Chien Li
  • Publication number: 20210194363
    Abstract: A time signal generating circuit of a power converter and a control method thereof are provided. The time signal generating circuit includes a reference frequency generating circuit, an on-time circuit and a frequency tracking circuit. The reference frequency generating circuit provides a reference frequency signal. The on-time circuit provides an on-time signal according to a first reference signal and a second reference signal. The second reference signal is related to an output voltage of the power converter. The frequency tracking circuit is coupled to the reference frequency generating circuit and the on-time circuit, and compares frequencies of the reference frequency signal and the on-time signal within a default time to generate a tracking signal. The on-time circuit adjusts the second reference signal according to the tracking signal, so that the on-time circuit adjusts the frequency of the on-time signal.
    Type: Application
    Filed: October 20, 2020
    Publication date: June 24, 2021
    Applicant: uPI Semiconductor Corp.
    Inventors: Chih-Lien Chang, Chun-Chieh Wang
  • Publication number: 20210119613
    Abstract: A plus width modulation (PWM) signal generator is disclosed. The PWM signal generator includes a first signal generator, an output terminal, a first voltage generating circuit and a second voltage generating circuit. The first signal generator provides a first signal. The first voltage generating circuit includes a voltage division circuit and is connected to the first signal generator and the output terminal, and provides a first preset voltage to the output terminal according to the first signal and a voltage division circuit. The second voltage generating circuit is connected to the first signal generator and the output terminal, and provides a second preset voltage to the output terminal according to the first signal. The first present voltage is earlier supplied to the output terminal than the second preset voltage, and after the first preset voltage continues to provide the preset time, the first preset voltage generating circuit stops providing the first preset voltage.
    Type: Application
    Filed: September 10, 2020
    Publication date: April 22, 2021
    Inventors: Chih-Lien CHANG, Chia-Chien LI
  • Publication number: 20210111625
    Abstract: The disclosure provides a power conversion circuit with a multi-function pin and a multi-function setting method thereof. The multi-function pin is coupled to an external setting circuit. The power conversion circuit includes a first function circuit, a second function circuit, and a judging circuit. The first function circuit is coupled to the multi-function pin. The second function circuit is coupled to the multi-function pin. The judging circuit is coupled to the multi-function pin, the first function circuit, and the second function circuit. The judging circuit provides a setting current to the multi-function pin, so that the external setting circuit generates a voltage according to the setting current. The judging circuit judges the type of external setting circuit according to voltage so as to activate the first function circuit or the second function circuit accordingly.
    Type: Application
    Filed: August 12, 2020
    Publication date: April 15, 2021
    Applicant: uPI Semiconductor Corp.
    Inventors: Chih-Lien Chang, Chun-Chieh Wang
  • Patent number: 10879794
    Abstract: A dc-dc controller is provided. The dc-dc controller includes a current sensing pin, a zero-current comparator, a comparison circuit and a threshold adjustment circuit. The current sensing pin is coupled to an output stage to receive a current sensing signal related to the output current. The zero-current comparator is coupled to the current sensing pin, and receives the current sensing signal and a first preset value to provide a zero-current signal. The comparison circuit is coupled to the zero-current comparator and the current sensing pin, and compares the current sensing signal with a second preset value to provide an adjustment signal. The threshold adjustment circuit is coupled to the comparison circuit and the zero-current comparator, and generates the first preset value according to the adjustment signal.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: December 29, 2020
    Assignee: uPI Semiconductor Corp.
    Inventors: Chih-Lien Chang, Min-Rui Lai
  • Patent number: 10855182
    Abstract: A power conversion circuit includes an error amplifying circuit, a first comparison circuit, a second comparison circuit and a control circuit. The error amplifying circuit provides an output signal. The first comparison circuit, coupled to the error amplifying circuit, receives the output signal and a ramp signal to generate a first comparison signal. The second comparison circuit receives an output voltage and a first reference voltage and provides a second comparison signal. The control circuit, coupled to the error amplifying circuit, the first comparison circuit and the second comparison circuit, provides a control signal to control the error amplifying circuit according to the first comparison signal, the second comparison signal and an enabling signal. In a first operation mode of error amplifying circuit, the output signal is an error amplifying signal. In a second operation mode of error amplifying circuit, the output signal is a second reference voltage.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: December 1, 2020
    Assignee: UPI SEMICONDUCTOR CORP.
    Inventors: Wei-Hsiu Hung, Chih-Lien Chang
  • Publication number: 20200195142
    Abstract: A power conversion circuit includes an error amplifying circuit, a first comparison circuit, a second comparison circuit and a control circuit. The error amplifying circuit provides an output signal. The first comparison circuit, coupled to the error amplifying circuit, receives the output signal and a ramp signal to generate a first comparison signal. The second comparison circuit receives an output voltage and a first reference voltage and provides a second comparison signal. The control circuit, coupled to the error amplifying circuit, the first comparison circuit and the second comparison circuit, provides a control signal to control the error amplifying circuit according to the first comparison signal, the second comparison signal and an enabling signal. In a first operation mode of error amplifying circuit, the output signal is an error amplifying signal. In a second operation mode of error amplifying circuit, the output signal is a second reference voltage.
    Type: Application
    Filed: December 17, 2019
    Publication date: June 18, 2020
    Inventors: WEI-HSIU HUNG, CHIH-LIEN CHANG
  • Patent number: 10680511
    Abstract: A DC-DC converting controller is disclosed. The DC-DC controller includes a current sensing unit, a parameter setting pin, a parameter setting unit and an error amplifier. The current sensing unit provides a sensing current. The parameter setting pin is coupled to an external parameter setting unit. The parameter setting unit is coupled to the current sensing unit and the parameter setting pin. The parameter setting unit has an internal parameter setting unit. The parameter setting unit generates a droop current according to the external parameter setting unit and the sensing current. The error amplifier includes a first input terminal and a second input terminal. The first input terminal receives an output feedback voltage and the second input terminal receives a first reference voltage. The second input terminal is coupled to a terminal of the internal parameter setting unit.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: June 9, 2020
    Assignee: UPI SEMICONDUCTOR CORP.
    Inventors: Chih-Lien Chang, Pei-Ling Hong, Cheng-Ching Hsu
  • Patent number: 10637454
    Abstract: A pulse-width modulation (PWM) controller including an output pin, a temporary voltage generation circuit and a tri-state voltage generation circuit is disclosed. The temporary voltage generation circuit includes a voltage-dividing unit and a control unit. The voltage-dividing unit is coupled to the output pin and the control unit respectively. The control unit receives an enable signal and a PWM signal. The tri-state voltage generation circuit is coupled to the temporary voltage generation circuit and the output pin and receives the enable signal, the PWM signal and a tri-state input voltage. When the PWM controller is operated in a tri-state mode, the control unit controls the voltage-dividing unit to provide a temporary voltage to the output pin according to the enable signal and PWM signal, and then the tri-state voltage generation circuit provides a tri-state voltage to the output pin according to the enable signal and PWM signal.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: April 28, 2020
    Assignee: UPI SEMICONDUCTOR CORP.
    Inventors: Chih-Lien Chang, Min-Rui Lai
  • Patent number: 10587191
    Abstract: A dc-dc converting circuit and a method for controlling the same are provided. The dc-dc converting circuit includes an output stage, a mode detection circuit, a PWM signal generating circuit and a ramp signal generating circuit. The output stage provides an output voltage. The mode detection circuit provides a mode detection signal. The PWM generating circuit provides a time signal to the output stage. When the dc-dc converting circuit enters a continuous conduction mode from a discontinuous conduction mode, the ramp signal generating circuit provides a second ramp signal to the PWM signal generating circuit in a preset time according to the mode detection signal. The ramp signal generating circuit provides a first ramp signal to the PWM signal generating circuit after the preset time. A slope of the second ramp signal is greater than a slope of the first ramp signal.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: March 10, 2020
    Assignee: uPI Semiconductor Corp.
    Inventors: Chih-Lien Chang, Min-Rui Lai
  • Patent number: 10574141
    Abstract: A current mirror calibration circuit, coupled to an error amplifier of a pulse-width modulation controller, includes a first voltage generation unit, a second voltage generation unit, a calibration unit and a current mirror circuit. During an initial period, the first voltage generation unit and second voltage generation unit provide a first default voltage and a second default voltage respectively. The current mirror circuit includes a first current unit and a second current unit. The first current unit receives an original current. The second current unit generates a mirror current having a proportional relationship with original current. The first current unit has a first node coupled to the first voltage generation unit and a second node coupled to a third default voltage. The second current unit has a third node coupled to the second voltage generation unit and calibration unit and a fourth node coupled to calibration unit and an output terminal of error amplifier.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: February 25, 2020
    Assignee: UPI SEMICONDUCTOR CORP
    Inventors: Chih-Lien Chang, Pei-Ling Hong, Min-Rui Lai
  • Patent number: 10511228
    Abstract: A DC-DC converting controller coupled to an output stage and an external resistor network and providing a pulse-width-modulation (PWM) signal to control the output stage to provide an output voltage is disclosed. The DC-DC converting controller includes a sensing circuit, a droop current circuit, a first pin and a PWM signal control loop. The sensing circuit, coupled to the output stage, provides a sensing current. The droop current circuit, coupled to the sensing circuit, provides a droop current according to the sensing current. The first pin, coupled to the droop current circuit and external resistor network, provides the droop current to make the external resistor network provide a second reference voltage. The PWM signal control loop, coupled to the external resistor network, generates a PWM signal according to the output voltage and the second reference voltage. The droop current is reduced to a default value with a default time.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: December 17, 2019
    Assignee: UPI SEMICONDUCTOR CORP.
    Inventors: Chih-Lien Chang, Min-Rui Lai
  • Publication number: 20190356220
    Abstract: A dc-dc controller is provided. The dc-dc controller includes a current sensing pin, a zero-current comparator, a comparison circuit and a threshold adjustment circuit. The current sensing pin is coupled to an output stage to receive a current sensing signal related to the output current. The zero-current comparator is coupled to the current sensing pin, and receives the current sensing signal and a first preset value to provide a zero-current signal. The comparison circuit is coupled to the zero-current comparator and the current sensing pin, and compares the current sensing signal with a second preset value to provide an adjustment signal. The threshold adjustment circuit is coupled to the comparison circuit and the zero-current comparator, and generates the first preset value according to the adjustment signal.
    Type: Application
    Filed: March 7, 2019
    Publication date: November 21, 2019
    Applicant: uPI Semiconductor Corp.
    Inventors: Chih-Lien Chang, Min-Rui Lai
  • Publication number: 20190356223
    Abstract: A dc-dc converting circuit and a method for controlling the same are provided. The dc-dc converting circuit includes an output stage, a mode detection circuit, a PWM signal generating circuit and a ramp signal generating circuit. The output stage provides an output voltage. The mode detection circuit provides a mode detection signal. The PWM generating circuit provides a time signal to the output stage. When the dc-dc converting circuit enters a continuous conduction mode from a discontinuous conduction mode, the ramp signal generating circuit provides a second ramp signal to the PWM signal generating circuit in a preset time according to the mode detection signal. The ramp signal generating circuit provides a first ramp signal to the PWM signal generating circuit after the preset time. A slope of the second ramp signal is greater than a slope of the first ramp signal.
    Type: Application
    Filed: January 31, 2019
    Publication date: November 21, 2019
    Applicant: uPI Semiconductor Corp.
    Inventors: Chih-Lien Chang, Min-Rui Lai
  • Patent number: 10461631
    Abstract: A DC-to-DC controller and a control method thereof are provided. The DC-to-DC controller couples to an output stage, and the output stage provides an output voltage and includes an upper bridge switch and a lower bridge switch. The DC-to-DC controller includes a time signal generating unit and a time signal control circuit. The time signal control circuit couples to the time signal generating unit and receives a preset voltage and the output voltage. During a soft start period, if the output voltage is lower than the preset voltage, after the upper bridge switch is turned off and before the upper bridge switch is turned on again, the time signal control circuit turns off the upper bridge switch and the lower bridge switch for a first preset time and turns on the lower bridge switch for a second preset time.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: October 29, 2019
    Assignee: uPI Semiconductor Corp.
    Inventors: Chih-Wen Hsiao, Chih-Lien Chang
  • Publication number: 20190296639
    Abstract: A current mirror calibration circuit, coupled to an error amplifier of a pulse-width modulation controller, includes a first voltage generation unit, a second voltage generation unit, a calibration unit and a current mirror circuit. During an initial period, the first voltage generation unit and second voltage generation unit provide a first default voltage and a second default voltage respectively. The current mirror circuit includes a first current unit and a second current unit. The first current unit receives an original current. The second current unit generates a mirror current having a proportional relationship with original current. The first current unit has a first node coupled to the first voltage generation unit and a second node coupled to a third default voltage. The second current unit has a third node coupled to the second voltage generation unit and calibration unit and a fourth node coupled to calibration unit and an output terminal of error amplifier.
    Type: Application
    Filed: March 8, 2019
    Publication date: September 26, 2019
    Inventors: Chih-Lien CHANG, Pei-Ling HONG, Min-Rui LAI
  • Publication number: 20190288675
    Abstract: A pulse-width modulation (PWM) controller including an output pin, a temporary voltage generation circuit and a tri-state voltage generation circuit is disclosed. The temporary voltage generation circuit includes a voltage-dividing unit and a control unit. The voltage-dividing unit is coupled to the output pin and the control unit respectively. The control unit receives an enable signal and a PWM signal. The tri-state voltage generation circuit is coupled to the temporary voltage generation circuit and the output pin and receives the enable signal, the PWM signal and a tri-state input voltage. When the PWM controller is operated in a tri-state mode, the control unit controls the voltage-dividing unit to provide a temporary voltage to the output pin according to the enable signal and PWM signal, and then the tri-state voltage generation circuit provides a tri-state voltage to the output pin according to the enable signal and PWM signal.
    Type: Application
    Filed: March 8, 2019
    Publication date: September 19, 2019
    Inventors: CHIH-LIEN CHANG, MIN-RUI LAI
  • Publication number: 20190252982
    Abstract: A DC-DC converting controller is disclosed. The DC-DC controller includes a current sensing unit, a parameter setting pin, a parameter setting unit and an error amplifier. The current sensing unit provides a sensing current. The parameter setting pin is coupled to an external parameter setting unit. The parameter setting unit is coupled to the current sensing unit and the parameter setting pin. The parameter setting unit has an internal parameter setting unit. The parameter setting unit generates a droop current according to the external parameter setting unit and the sensing current. The error amplifier includes a first input terminal and a second input terminal. The first input terminal receives an output feedback voltage and the second input terminal receives a first reference voltage. The second input terminal is coupled to a terminal of the internal parameter setting unit.
    Type: Application
    Filed: January 22, 2019
    Publication date: August 15, 2019
    Inventors: CHIH-LIEN CHANG, PEI-LING HONG, CHENG-CHING HSU
  • Publication number: 20190245447
    Abstract: A DC-DC converting controller coupled to an output stage and an external resistor network and providing a pulse-width-modulation (PWM) signal to control the output stage to provide an output voltage is disclosed. The DC-DC converting controller includes a sensing circuit, a droop current circuit, a first pin and a PWM signal control loop. The sensing circuit, coupled to the output stage, provides a sensing current. The droop current circuit, coupled to the sensing circuit, provides a droop current according to the sensing current. The first pin, coupled to the droop current circuit and external resistor network, provides the droop current to make the external resistor network provide a second reference voltage. The PWM signal control loop, coupled to the external resistor network, generates a PWM signal according to the output voltage and the second reference voltage. The droop current is reduced to a default value with a default time.
    Type: Application
    Filed: January 28, 2019
    Publication date: August 8, 2019
    Inventors: CHIH-LIEN CHANG, MIN-RUI LAI