Patents by Inventor Chieh-Min Feng
Chieh-Min Feng 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).
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Publication number: 20240372485Abstract: A switching regulator includes: a phase number signal generator circuit which includes: a current sensing signal differentiator circuit for performing differentiation on a current sensing signal to generate a current differentiation signal; a current sense signal filter circuit for filtering the current sense signal to generate a filtered current signal according to the current differentiation signal; and a phase number decision circuit for deciding a phase number signal according to the filtered current signal; and an AQR signal generator circuit which includes: a voltage sensing signal differentiator circuit for performing differentiation on a voltage sensing signal to generate a voltage differentiation signal; and plural comparator circuits for comparing the voltage differentiation signal with plural AQR threshold signals to generate plural AQR comparison signals, so as to generate an AQR signal to control an operation signal generator circuit to perform an adaptive quick response procedure.Type: ApplicationFiled: August 16, 2023Publication date: November 7, 2024Inventors: Chien-Hui Wang, Chieh-Min Feng
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Patent number: 8710815Abstract: The present invention discloses a voltage regulator, and a control circuit and a control method therefor. The method for controlling a voltage regulator comprises: receiving a dynamic voltage identification signal which instructs the voltage regulator to change its output voltage to a target voltage, and generating a compensation signal to shorten an interval for the output voltage of the voltage regulator to reach the target voltage.Type: GrantFiled: June 14, 2011Date of Patent: April 29, 2014Assignee: Richtek Technology Corporation, R.O.C.Inventors: Chieh-Min Feng, Ting-Hung Wang, Chung-Sheng Cheng, Jian-Rong Huang
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Patent number: 8159805Abstract: A quick response mechanism for a switching power system includes a detector and an adjustor connected to the detector. The detector is configured to directly monitor the drop of the output voltage of the switching power system so that a quick response could be immediately triggered when a load transient occurs. The adjustor is configured to adjust the duration of the quick response, thereby preventing the output voltage from undershoot or ringback.Type: GrantFiled: May 12, 2009Date of Patent: April 17, 2012Assignee: Richtek Technology Corp.Inventors: Chieh-Min Feng, Ting-Hung Wang
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Publication number: 20110316518Abstract: The present invention discloses a voltage regulator, and a control circuit and a control method therefor. The method for controlling a voltage regulator comprises: receiving a dynamic voltage identification signal which instructs the voltage regulator to change its output voltage to a target voltage, and generating a compensation signal to shorten an interval for the output voltage of the voltage regulator to reach the target voltage.Type: ApplicationFiled: June 14, 2011Publication date: December 29, 2011Inventors: Chieh-Min Feng, Ting-Hung Wang, Chung-Sheng Cheng, Jian-Rong Huang
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Patent number: 8076917Abstract: The present invention discloses a buck switching regulator with improved mode transition, and a method for controlling a buck switching regulator. The method comprises: providing a switching regulator including: an output power stage for converting an input voltage to an output voltage, the output power stage being controlled by a first PWM signal during a fixed-frequency PWM mode (FPWM mode), and being controlled by a first voltage signal during a pulse skipping mode (PSK mode), wherein the first PWM signal is generated according to the first voltage signal; and in a transition from the PSK mode to the FPWM mode, proving a second voltage signal as a starting point of the first voltage signal, the second voltage signal being substantially close to a target of the first voltage signal in the FPWM mode.Type: GrantFiled: April 6, 2009Date of Patent: December 13, 2011Assignee: Richtek Technology CorporationInventors: Chieh-Min Feng, Kuo-Lung Tseng, Jian-Rong Huang, Wei-How Chan
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Publication number: 20110291629Abstract: The present invention discloses a switching regulator eliminating beat oscillation, comprising: a first transistor, a second transistor, and an inductor connected to a common node, wherein the first and second transistors operate to convert an input voltage to an output voltage; a comparator comparing a voltage signal with a saw tooth wave to generate a control signal controlling at least one of the first and second transistors; a feedback loop obtaining a feedback signal from the output voltage and generating the voltage signal according to the feedback signal; and an inductorless filter circuit located in the feedback loop for filtering a predetermined frequency band.Type: ApplicationFiled: August 12, 2011Publication date: December 1, 2011Inventors: Kuo-Lung Tseng, Wei-How Chan, Chieh-Min Feng
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Patent number: 8049478Abstract: The present invention discloses a switching regulator eliminating beat oscillation, comprising: a first transistor, a second transistor, and an inductor connected to a common node, wherein the first and second transistors operate to convert an input voltage to an output voltage; a comparator comparing a voltage signal with a saw tooth wave to generate a control signal controlling at least one of the first and second transistors; a feedback loop obtaining a feedback signal from the output voltage and generating the voltage signal according to the feedback signal; and an inductorless filter circuit located in the feedback loop for filtering a predetermined frequency band.Type: GrantFiled: October 2, 2009Date of Patent: November 1, 2011Assignee: Richtek Technology CorporationInventors: Kuo-Lung Tseng, Wei-How Chan, Chieh-Min Feng
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Publication number: 20100156370Abstract: The present invention discloses a switching regulator eliminating beat oscillation, comprising: a first transistor, a second transistor, and an inductor connected to a common node, wherein the first and second transistors operate to convert an input voltage to an output voltage; a comparator comparing a voltage signal with a saw tooth wave to generate a control signal controlling at least one of the first and second transistors; a feedback loop obtaining a feedback signal from the output voltage and generating the voltage signal according to the feedback signal; and an inductorless filter circuit located in the feedback loop for filtering a predetermined frequency band.Type: ApplicationFiled: October 2, 2009Publication date: June 24, 2010Inventors: Kuo-Lung Tseng, Wei-How Chan, Chieh-Min Feng
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Publication number: 20090284239Abstract: A quick response mechanism for a switching power system includes a detector and an adjustor connected to the detector. The detector is configured to directly monitor the drop of the output voltage of the switching power system so that a quick response could be immediately triggered when a load transient occurs. The adjustor is configured to adjust the duration of the quick response, thereby preventing the output voltage from undershoot or ringback.Type: ApplicationFiled: May 12, 2009Publication date: November 19, 2009Inventors: Chieh-Min Feng, Ting-Hung Wang
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Patent number: 7598798Abstract: A trimmer device for adjusting a reference signal of a target circuit is disclosed. The trimmer device includes: a switch controlling module and an impedance adjustment circuit. The switch controlling module includes: a fuse, selectively being melted according to the reference signal; and a control signal generating circuit, for generating a control signal according to the melting condition of the fuse. The impedance adjustment circuit includes: a switch module, being selectively conductive according to the control signal; and an impedance network, for determining an equivalent impedance of the impedance network according to the conducting condition of the switch module to further adjust the reference signal.Type: GrantFiled: July 16, 2007Date of Patent: October 6, 2009Assignee: Realtek Semiconductor Corp.Inventor: Chieh-Min Feng
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Publication number: 20090200998Abstract: The present invention discloses a buck switching regulator with improved mode transition, and a method for controlling a buck switching regulator. The method comprises: providing a switching regulator including: an output power stage for converting an input voltage to an output voltage, the output power stage being controlled by a first PWM signal during a fixed-frequency PWM mode (FPWM mode), and being controlled by a first voltage signal during a pulse skipping mode (PSK mode), wherein the first PWM signal is generated according to the first voltage signal; and in a transition from the PSK mode to the FPWM mode, proving a second voltage signal as a starting point of the first voltage signal, the second voltage signal being substantially close to a target of the first voltage signal in the FPWM mode.Type: ApplicationFiled: April 6, 2009Publication date: August 13, 2009Inventors: Chieh-Min Feng, Kuo-Lung Tseng, Jian-Rong Huang, Wei-How Chan
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Patent number: 7564306Abstract: A common-mode feedback circuit is provided. An amplifier with a common-mode feedback circuit is compensated by adding a compensating unit so that the amplifier totally has two poles and one zero in its frequency response. Accordingly, the gain of the amplifier is not sacrificed, and both the stability and the phase margin of the circuit are improved.Type: GrantFiled: June 13, 2007Date of Patent: July 21, 2009Assignee: Realtek Semiconductor Corp.Inventors: Chao-Cheng Lee, Chieh-Min Feng
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Patent number: 7402988Abstract: A switching regulator includes a reference voltage generator and a switching-regulating module. The reference voltage generator receives a digital control signal and generates a reference voltage according to the digital control signal. The switching-regulating module is connected to the reference voltage generator and generates an output voltage according to the reference voltage. The value of the digital control signal is gradually increased to make the reference voltage being gradually increased at the initial stage of the activation of the switching regulator.Type: GrantFiled: February 24, 2006Date of Patent: July 22, 2008Assignee: Realtek Semiconductor Corp.Inventors: Pao-Cheng Chiu, Chieh-Min Feng, Ming-Han Lee
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Publication number: 20080048778Abstract: A common-mode feedback circuit is provided. An amplifier with a common-mode feedback circuit is compensated by adding a compensating unit so that the amplifier totally has two poles and one zero in its frequency response. Accordingly, the gain of the amplifier is not sacrificed, and both the stability and the phase margin of the circuit are improved.Type: ApplicationFiled: June 13, 2007Publication date: February 28, 2008Applicant: Realtek Semiconductor Corp.Inventors: Chao-Cheng Lee, Chieh-Min Feng
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Publication number: 20080012625Abstract: A trimmer device for adjusting a reference signal of a target circuit is disclosed. The trimmer device includes: a switch controlling module and an impedance adjustment circuit. The switch controlling module includes: a fuse, selectively being melted according to the reference signal; and a control signal generating circuit, for generating a control signal according to the melting condition of the fuse. The impedance adjustment circuit includes: a switch module, being selectively conductive according to the control signal; and an impedance network, for determining an equivalent impedance of the impedance network according to the conducting condition of the switch module to further adjust the reference signal.Type: ApplicationFiled: July 16, 2007Publication date: January 17, 2008Inventor: Chieh-Min Feng
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Patent number: 7298214Abstract: An amplifying circuit with a variable supply voltage and a method thereof are disclosed. The amplifying circuit employs a voltage converter to adjust the supply voltage, thereby upgrading the energy efficiency of the circuit. The circuit also includes a control device, which can generate a control signal for controlling the voltage converter according to an output signal or input signal of the circuit.Type: GrantFiled: June 15, 2005Date of Patent: November 20, 2007Assignee: Realtek Semiconductor Corp.Inventors: Chao-Cheng Lee, Tzung-Ming Chen, Chieh-Min Feng
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Publication number: 20050285682Abstract: An amplifying circuit with a variable supply voltage and a method thereof are disclosed. The amplifying circuit employs a voltage converter to adjust the supply voltage, thereby upgrading the energy efficiency of the circuit. The circuit also includes a control device, which can generate a control signal for controlling the voltage converter according to an output signal or input signal of the circuit.Type: ApplicationFiled: June 15, 2005Publication date: December 29, 2005Inventors: Chao-Cheng Lee, Tzung-Ming Chen, Chieh-Min Feng