Patents by Inventor Chu Yu Chu
Chu Yu Chu 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: 20090174373Abstract: A clamp circuit comprises a first transistor, a second transistor and a voltage-dividing circuit. The first transistor has a source terminal connected to a reference voltage, and has a drain terminal grounded through a current source. The second transistor has a gate terminal connected to the gate and drain terminals of the first transistor, and has a drain terminal grounded. The voltage-dividing circuit is connected to an input voltage end, an output voltage end and a source terminal of the second transistor for providing a clamping voltage.Type: ApplicationFiled: September 2, 2008Publication date: July 9, 2009Applicant: ADVANCED ANALOG TECHNOLOGY, INC.Inventors: LI SHENG CHENG, YU MIN SUN, CHU YU CHU
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Patent number: 7551008Abstract: The circuit for fixing the peak current of an inductor includes an operating current, a ramp-type boost converter and a comparator. The magnitude of the operating current is proportional to that of the voltage source of the inductor. The ramp-type boost converter is connected to the operating current. One input end of the comparator is connected to a reference voltage, and the other end is connected to the output of the ramp-type boost converter. The output of the comparator is connected to the gate of a power transistor, which controls the turn-on time of the inductor.Type: GrantFiled: March 19, 2007Date of Patent: June 23, 2009Assignee: Advanced Analog Technology, Inc.Inventors: Mao Chuan Chien, Chu Yu Chu, Yu Min Sun
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Patent number: 7501908Abstract: The oscillation circuit includes an output current mirror, a P-N complementary current mirror, a P-type current mirror and an N-type current mirror. The P-N complementary current mirror has the same structure as the output current mirror but has current that is only 1/k times the current of the output current mirror, wherein k is greater than 1. The P-type current mirror connects to the P-N complementary current mirror, and has current that is m times the current of the P-N complementary current mirror, where m is greater than 1. The N-type current mirror has one end connected to the P-type current mirror and another end connected to the output current mirror. The N-type current mirror has current that is n times the current of the P-type current mirror, where m × n k ? 1 , and n is greater than 1.Type: GrantFiled: March 29, 2007Date of Patent: March 10, 2009Assignee: Advanced Analog Technology, Inc.Inventors: Mao Chuan Chien, Yu Min Sun, Chu Yu Chu
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Patent number: 7495499Abstract: The power transistor circuit with high-voltage endurance includes a first power transistor, a second power transistor and an enabling circuit. The first power transistor includes a first voltage endurance and a first inner resistance, while the second power transistor includes a second voltage endurance and a second inner resistance. The first voltage endurance and the first inner resistance are smaller than the second voltage endurance and the second inner resistance, respectively. The drain of the second power transistor is connected to the drain of the first power transistor and the enabling circuit. The enabling circuit enables the second power transistor first, and when the drain voltage of the first power transistor is smaller than the first endurance, the enabling circuit then enables the first power transistor.Type: GrantFiled: April 10, 2007Date of Patent: February 24, 2009Assignee: Advanced Analog Technology, Inc.Inventors: Chien Chuan Chung, Chu Yu Chu, Yu Min Sun
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Patent number: 7471117Abstract: The circuit for detecting the maximal frequency of the pulse frequency modulation includes an oscillator-controlling unit, a delay circuit and a master-slave register. The oscillator-controlling unit is connected to an oscillator, which generates the pulse frequency modulation signals, and includes a first-half pulse-generating module and a second-half pulse-generating module. The delay circuit is connected to the second-half pulse-generating module. The master-slave register includes a clock, an input end and an output end, wherein the input end is connected to the oscillator-controlling unit, and the clock is connected to the delay circuit.Type: GrantFiled: March 20, 2007Date of Patent: December 30, 2008Assignee: Advanced Analog Technology, Inc.Inventors: Li Chieh Chen, Yu Min Sun, Chu Yu Chu
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Patent number: 7456622Abstract: The low voltage circuit for starting up a synchronous step-up DC/DC converter, which connects to a voltage source through an inductor, includes a P-type power transistor, an N-type power transistor and a controller. The P-type power transistor includes a body diode, and one end of the P-type power transistor acts as a power source of an oscillator. The N-type power transistor connects the P-type power transistor in series, and both of the power transistors are not enabled at the same time. The oscillator electrically connects to the controller, which enables the P-type power transistor at initialization time, and enables the N-type power transistor a period after the initialization time.Type: GrantFiled: April 10, 2007Date of Patent: November 25, 2008Assignee: Advanced Analog Technology, Inc.Inventors: Mao Chuan Chien, Chu Yu Chu, Yu Min Sun
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Patent number: 7446621Abstract: The switching method between pulse frequency modulation and pulse width modulation signals is first based on an output voltage of a power transistor to generate a corresponding pulse frequency modulation signal. Next, it is determined whether the corresponding pulse frequency modulation signal has reached its maximal frequency. If so, the initial pulse width modulation signal is adjusted to have the same width as the pulse frequency modulation signal. Thereafter, the adjusted pulse width modulation signal is outputted.Type: GrantFiled: June 6, 2007Date of Patent: November 4, 2008Assignee: Advanced Analog Technology, Inc.Inventors: Li Chieh Chen, Yu Min Sun, Chu Yu Chu
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Publication number: 20080231386Abstract: The oscillation circuit includes an output current mirror, a P-N complementary current mirror, a P-type current mirror and an N-type current mirror. The P-N complementary current mirror has the same structure as the output current mirror but has current that is only 1/k times the current of the output current mirror, wherein k is greater than 1. The P-type current mirror connects to the P-N complementary current mirror, and has current that is m times the current of the P-N complementary current mirror, where m is greater than 1. The N-type current mirror has one end connected to the P-type current mirror and another end connected to the output current mirror. The N-type current mirror has current that is n times the current of the P-type current mirror, where m × n k ? 1 , and n is greater than 1.Type: ApplicationFiled: March 29, 2007Publication date: September 25, 2008Applicant: ADVANCED ANALOG TECHNOLOGY, INC.Inventors: Mao Chuan Chien, Yu Min Sun, Chu Yu Chu
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Publication number: 20080231348Abstract: The circuit for fixing the peak current of an inductor includes an operating current, a ramp-type boost converter and a comparator. The magnitude of the operating current is proportional to that of the voltage source of the inductor. The ramp-type boost converter is connected to the operating current. One input end of the comparator is connected to a reference voltage, and the other end is connected to the output of the ramp-type boost converter. The output of the comparator is connected to the gate of a power transistor, which controls the turn-on time of the inductor.Type: ApplicationFiled: March 19, 2007Publication date: September 25, 2008Applicant: ADVANCED ANALOG TECHNOLOGY, INC.Inventors: Mao Chuan Chien, Chu Yu Chu, Yu Min Sun
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Publication number: 20080224673Abstract: The low voltage circuit for starting up a synchronous step-up DC/DC converter, which connects to a voltage source through an inductor, includes a P-type power transistor, an N-type power transistor and a controller. The P-type power transistor includes a body diode, and one end of the P-type power transistor acts as a power source of an oscillator. The N-type power transistor connects the P-type power transistor in series, and both of the power transistors are not enabled at the same time. The oscillator electrically connects to the controller, which enables the P-type power transistor at initialization time, and enables the N-type power transistor a period after the initialization time.Type: ApplicationFiled: April 10, 2007Publication date: September 18, 2008Applicant: ADVANCED ANALOG TECHNOLOGY, INC.Inventors: Mao Chuan Chien, Chu Yu Chu, Yu Min Sun
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Publication number: 20080218284Abstract: The switching method between pulse frequency modulation and pulse width modulation signals is first based on an output voltage of a power transistor to generate a corresponding pulse frequency modulation signal. Next, it is determined whether the corresponding pulse frequency modulation signal has reached its maximal frequency. If so, the initial pulse width modulation signal is adjusted to have the same width as the pulse frequency modulation signal. Thereafter, the adjusted pulse width modulation signal is outputted.Type: ApplicationFiled: June 6, 2007Publication date: September 11, 2008Applicant: ADVANCED ANALOG TECHNOLOGY, INC.Inventors: Li Chieh Chen, Yu Min Sun, Chu Yu Chu
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Publication number: 20080205099Abstract: The power transistor circuit with high-voltage endurance includes a first power transistor, a second power transistor and an enabling circuit. The first power transistor includes a first voltage endurance and a first inner resistance, while the second power transistor includes a second voltage endurance and a second inner resistance. The first voltage endurance and the first inner resistance are smaller than the second voltage endurance and the second inner resistance, respectively. The drain of the second power transistor is connected to the drain of the first power transistor and the enabling circuit. The enabling circuit enables the second power transistor first, and when the drain voltage of the first power transistor is smaller than the first endurance, the enabling circuit then enables the first power transistor.Type: ApplicationFiled: April 10, 2007Publication date: August 28, 2008Applicant: ADVANCED ANALOG TECHNOLOGY, INC.Inventors: Chien Chuan Chung, Chu Yu Chu, Yu Min Sun
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Publication number: 20080197885Abstract: The circuit for detecting the maximal frequency of the pulse frequency modulation includes an oscillator-controlling unit, a delay circuit and a master-slave register. The oscillator-controlling unit is connected to an oscillator, which generates the pulse frequency modulation signals, and includes a first-half pulse-generating module and a second-half pulse-generating module. The delay circuit is connected to the second-half pulse-generating module. The master-slave register includes a clock, an input end and an output end, wherein the input end is connected to the oscillator-controlling unit, and the clock is connected to the delay circuit.Type: ApplicationFiled: March 20, 2007Publication date: August 21, 2008Applicant: ADVANCED ANALOG TECHNOLOGY, INC.Inventors: Li Chieh Chen, Yu Min Sun, Chu Yu Chu
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Patent number: 7245114Abstract: The present invention discloses a DC-to-DC step-up converter to which a logic control unit is added in order to reduce the ripples of a DC output voltage and improve the power quality. The converter of the present invention comprises a step-up circuit, a ring oscillator, a divider circuit, a PFM (pulse frequency modulation) comparator and a logic control unit. The step-up circuit is used to step up a source voltage to generate a DC output voltage. The ring oscillator is used to generate an oscillator output signal. The divider circuit receives the DC output voltage to generate a feedback voltage. The PFM comparator compares the feedback voltage with a reference voltage to generate a comparator output signal to control outputting of the oscillator output signal.Type: GrantFiled: July 15, 2005Date of Patent: July 17, 2007Assignee: Advanced Analog Technology, Inc.Inventors: Chu Yu Chu, You Min Sun, Mao Cyuan Jian, Shih Jie Liao