Patents by Inventor Tsz Yin Man
Tsz Yin Man 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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Patent number: 11955962Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. A plurality of non-dissipative elements may be connected in parallel or in series between the first pair of switches and the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. The defined sequence may have a switching pattern with a voltage change portion arranged to cause a change in an output voltage of the capacitive element driver during application thereof on the capacitive element driver.Type: GrantFiled: December 28, 2022Date of Patent: April 9, 2024Assignee: NEOLITH LLCInventors: Tsz Yin Man, Chi Fan Yung, Bruce C. Larson
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Publication number: 20230231553Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. A plurality of non-dissipative elements may be connected in parallel or in series between the first pair of switches and the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. The defined sequence may have a switching pattern with a voltage change portion arranged to cause a change in an output voltage of the capacitive element driver during application thereof on the capacitive element driver.Type: ApplicationFiled: December 28, 2022Publication date: July 20, 2023Inventors: Tsz Yin MAN, Chi Fan YUNG, Bruce C. LARSON
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Patent number: 11575376Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. One or more non-dissipative elements may be connected between the common node of the first pair of switches and the common node of the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. In one sequence, switches in a selected driver cell may subtract a specified voltage from an input voltage, bypass the selected driver cell, and add the specified voltage to the input voltage.Type: GrantFiled: September 25, 2020Date of Patent: February 7, 2023Assignee: NEOLITH LLCInventors: Tsz Yin Man, Chi Fan Yung, Bruce C. Larson
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Publication number: 20210099171Abstract: A circuit for driving the voltage of a capacitive element between two voltage levels has at least one driver cell with a first pair of switches connected in series between a first terminal of a voltage source and the capacitive element, and a second pair of switches connected in series between a second terminal of the voltage source and the capacitive element. One or more non-dissipative elements may be connected between the common node of the first pair of switches and the common node of the second pair of switches. Combinations of switches from the driver cells may be activated and deactivated in a defined sequence to provide step-wise transfer of energy to the capacitive element. In one sequence, switches in a selected driver cell may subtract a specified voltage from an input voltage, bypass the selected driver cell, and add the specified voltage to the input voltage.Type: ApplicationFiled: September 25, 2020Publication date: April 1, 2021Inventors: Tsz Yin MAN, Chi Fan YUNG, Bruce C. LARSON
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Patent number: 10756627Abstract: A switch mode power supply (voltage converter) is adapted as a current-mode control buck regulator for different loading conditions. The voltage converter operates in a continuous conduction mode (CCM) during heavy load conditions using pulse width modulation (PWM). When a zero-current detector determines no inductor current during light load conditions (discontinuous conduction mode (DCM) region), the controller initiates adaptive duty control using pulse frequency modulation (PFM). Adaptive duty estimation circuitry provides controllable energy to charge the power inductor to maintain voltage accuracy and maximize efficiency when in the PFM mode. Using clock synchronization and a single control-loop, smooth transition between PFM, PWM, and bypass modes is automatically performed. Clock synchronization from a master oscillator provides a base for frequency division in different operation modes which gives controllable evenly distributed switching harmonics.Type: GrantFiled: September 11, 2018Date of Patent: August 25, 2020Assignee: MICROCHIP TECHNOLOGY INCORPORATEDInventors: Alex Hsu, Sam Tsui, Paolo Nora, Tsz Yin Man
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Publication number: 20190081546Abstract: A switch mode power supply (voltage converter) is adapted as a current-mode control buck regulator for different loading conditions. The voltage converter operates in a continuous conduction mode (CCM) during heavy load conditions using pulse width modulation (PWM). When a zero-current detector determines no inductor current during light load conditions (discontinuous conduction mode (DCM) region), the controller initiates adaptive duty control using pulse frequency modulation (PFM). Adaptive duty estimation circuitry provides controllable energy to charge the power inductor to maintain voltage accuracy and maximize efficiency when in the PFM mode. Using clock synchronization and a single control-loop, smooth transition between PFM, PWM, and bypass modes is automatically performed. Clock synchronization from a master oscillator provides a base for frequency division in different operation modes which gives controllable evenly distributed switching harmonics.Type: ApplicationFiled: September 11, 2018Publication date: March 14, 2019Applicant: Microchip Technology IncorporatedInventors: Alex Hsu, Sam Tsui, Paolo Nora, Tsz Yin Man
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Patent number: 8760141Abstract: A frequency-hopping pulse-width modulator is disclosed, which facilitates a switching regulator to use smaller-size inductive and capacitive elements, to have an improved power efficiency at light load, as well as predictable spectrum at different load levels. The improved modulator automatically determines the switching frequency of a switching regulator according to the load current delivered by the switching regulator from a number of pre-defined frequencies, which are all multiples of a fundamental frequency. By designing the maximum switching frequency of frequency-hopping pulse-width modulator in the MHz range, a switching regulator is able to use smaller-size inductive and capacitive elements. Light-load efficiency of the switching regulator with the frequency-hopping pulse-width modulator is also greatly improved as switching frequency of such switching regulator is reduced with decreased load current.Type: GrantFiled: December 30, 2008Date of Patent: June 24, 2014Assignee: The Hong Kong University of Science and TechnologyInventors: Tsz Yin Man, Kwok Tai Philip Mok, Man Sun John Chan
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Publication number: 20090174440Abstract: A frequency-hopping pulse-width modulator is disclosed, which facilitates a switching regulator to use smaller-size inductive and capacitive elements, to have an improved power efficiency at light load, as well as predictable spectrum at different load levels. The improved modulator automatically determines the switching frequency of a switching regulator according to the load current delivered by the switching regulator from a number of pre-defined frequencies, which are all multiples of a fundamental frequency. By designing the maximum switching frequency of frequency-hopping pulse-width modulator in the MHz range, a switching regulator is able to use smaller-size inductive and capacitive elements. Light-load efficiency of the switching regulator with the frequency-hopping pulse-width modulator is also greatly improved as switching frequency of such switching regulator is reduced with decreased load current.Type: ApplicationFiled: December 30, 2008Publication date: July 9, 2009Applicant: The Hong Kong University of Science and TechnologyInventors: Tsz Yin MAN, Kwok Tai Philip MOK, Man Sun John CHAN
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Patent number: 7285942Abstract: A low-dropout regulator with a single-transistor-control providing improved transient response and stability is disclosed. The single-transistor-control provides a dynamic resistance at the output of the regulator for minimizing undershoot and overshoot, and hence improves transient response. Since the single-control transistor reduces the output resistance of the regulator, the output pole is pushed to a sufficiently high frequency without affecting stability. Therefore, the limited choice of combinations of the output capacitance and its equivalent-series-resistance is substantially relaxed.Type: GrantFiled: March 7, 2006Date of Patent: October 23, 2007Inventors: Tsz Yin Man, Chi Yat Leung, Ka Nang Leung, Philip Kwok Tai Mok, John Man Sun Chan
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Patent number: RE42335Abstract: A low-dropout regulator with a single-transistor-control providing improved transient response and stability is disclosed. The single-transistor-control provides a dynamic resistance at the output of the regulator for minimizing undershoot and overshoot, and hence improves transient response. Since the single-control transistor reduces the output resistance of the regulator, the output pole is pushed to a sufficiently high frequency without affecting stability. Therefore, the limited choice of combinations of the output capacitance and its equivalent-series-resistance is substantially relaxed.Type: GrantFiled: October 23, 2009Date of Patent: May 10, 2011Assignee: The Hong Kong University of Science and TechnologyInventors: Tsz Yin Man, Chi Yat Leung, Ka Nang Leung, Philip Kwok Tai Mok, John Man Sun Chan