Patents by Inventor Michiyasu Deguchi
Michiyasu Deguchi 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: 10591942Abstract: A voltage regulator which includes a differential amplifier circuit containing a first and second input transistors, controlling a gate-source voltage in each of the first and second input transistors including: a current source configured to drive the differential amplifier circuit; the first input transistor containing a gate; the second input transistor containing a gate; and a voltage controller including at least one of a first voltage control circuit to control a voltage at a tail connection point, a second voltage control circuit to control the voltage at the gate of the first input transistor, a third voltage control circuit to control the voltage at the tail connection point, and a fourth voltage control circuit to control the voltage at the gate of the second input transistor.Type: GrantFiled: July 9, 2019Date of Patent: March 17, 2020Assignee: ABLIC INC.Inventors: Tadakatsu Kuroda, Tsutomu Tomioka, Hideyuki Sawai, Michiyasu Deguchi
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Publication number: 20200019200Abstract: A voltage regulator which includes a differential amplifier circuit containing a first and second input transistors, controlling a gate-source voltage in each of the first and second input transistors including: a current source configured to drive the differential amplifier circuit; the first input transistor containing a gate; the second input transistor containing a gate; and a voltage controller including at least one of a first voltage control circuit to control a voltage at a tail connection point, a second voltage control circuit to control the voltage at the gate of the first input transistor, a third voltage control circuit to control the voltage at the tail connection point, and a fourth voltage control circuit to control the voltage at the gate of the second input transistor.Type: ApplicationFiled: July 9, 2019Publication date: January 16, 2020Inventors: Tadakatsu KURODA, Tsutomu TOMIOKA, Hideyuki SAWAI, Michiyasu DEGUCHI
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Patent number: 10007282Abstract: Provided is a voltage regulator capable of stably generating a constant output voltage even in a high temperature environment. The voltage regulator includes: an output transistor; an output terminal connected to a drain of the output transistor and outputting an output voltage; an error amplifier circuit configured to supply a signal obtained by amplifying a difference between a divided voltage of the output voltage and a reference voltage to a gate of the output transistor; and an NMOS transistor connected between the output terminal and a reference potential and configured to turn on, when the voltage regulator reaches a predetermined temperature at which a leakage current flowing in the output transistor is absorbed, to lead the leakage current to the reference potential.Type: GrantFiled: July 31, 2017Date of Patent: June 26, 2018Assignee: ABLIC INC.Inventor: Michiyasu Deguchi
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Publication number: 20180039296Abstract: Provided is a voltage regulator capable of stably generating a constant output voltage even in a high temperature environment. The voltage regulator includes: an output transistor; an output terminal connected to a drain of the output transistor and outputting an output voltage; an error amplifier circuit configured to supply a signal obtained by amplifying a difference between a divided voltage of the output voltage and a reference voltage to a gate of the output transistor; and an NMOS transistor connected between the output terminal and a reference potential and configured to turn on, when the voltage regulator reaches a predetermined temperature at which a leakage current flowing in the output transistor is absorbed, to lead the leakage current to the reference potential.Type: ApplicationFiled: July 31, 2017Publication date: February 8, 2018Inventor: Michiyasu DEGUCHI
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Patent number: 9600006Abstract: Provided is a voltage regulator having a simple circuit configuration in which a protection circuit is not erroneously operated, and delay time of activation of the protection circuit is short. The voltage regulator includes: a protection circuit configured to control an output transistor when an abnormality of the voltage regulator is detected; a first constant current circuit configured to supply operating current to the protection circuit; and a detection circuit configured to detect output current flowing through the output transistor, to thereby control the first constant current circuit. The detection circuit is further configured to detect the output current with a predetermined reference current value. The protection circuit is further configured to control the output transistor so that the output current does not fall below the reference current value.Type: GrantFiled: January 19, 2016Date of Patent: March 21, 2017Assignee: SEIKO INSTRUMENTS INC.Inventors: Tadashi Kurozo, Takao Nakashimo, Michiyasu Deguchi
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Patent number: 9553514Abstract: To provide a DC-DC converter which prevents overshoot from occurring in an output voltage even when a power supply voltage rises from a voltage lower than a desired output voltage of the DC-DC converter to a normal voltage. A DC-DC converter is equipped with a 100% DUTY detection circuit which detects a 100% DUTY state of a PWM comparator, a power supply voltage rise detection circuit which detects a rise in a power supply voltage, and a discharge control circuit which lowers an output voltage of an error amplifier. The DC-DC converter is configured to lower the output voltage of the error amplifier when a power supply voltage rise detection signal is outputted where a 100% DUTY state is reached and the output voltage of the error amplifier is higher than a predetermined voltage.Type: GrantFiled: November 23, 2015Date of Patent: January 24, 2017Assignee: SII SEMICONDUCTOR CORPORATIONInventors: Hiroyuki Masuko, Kosuke Takada, Michiyasu Deguchi
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Patent number: 9444335Abstract: Provided is a switching regulator configured to achieve a 100% Duty state and reduce an occurrence of an overshoot. The switching regulator has a configuration in which a clamp circuit configured to dynamically generate a clamp level clamps an output voltage of an error amplifier in accordance with a peak value of a triangular wave signal.Type: GrantFiled: January 30, 2015Date of Patent: September 13, 2016Assignee: SII SEMICONDUCTOR CORPORATIONInventors: Michiyasu Deguchi, Kosuke Takada, Tetsuya Makino
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Publication number: 20160211751Abstract: Provided is a voltage regulator having a simple circuit configuration in which a protection circuit is not erroneously operated, and delay time of activation of the protection circuit is short. The voltage regulator includes: a protection circuit configured to control an output transistor when an abnormality of the voltage regulator is detected; a first constant current circuit configured to supply operating current to the protection circuit; and a detection circuit configured to detect output current flowing through the output transistor, to thereby control the first constant current circuit. The detection circuit is further configured to detect the output current with a predetermined reference current value. The protection circuit is further configured to control the output transistor so that the output current does not fall below the reference current value.Type: ApplicationFiled: January 19, 2016Publication date: July 21, 2016Inventors: Tadashi KUROZO, Takao NAKASHIMO, Michiyasu DEGUCHI
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Publication number: 20160156264Abstract: To provide a DC-DC converter which prevents overshoot from occurring in an output voltage even when a power supply voltage rises from a voltage lower than a desired output voltage of the DC-DC converter to a normal voltage. A DC-DC converter is equipped with a 100% DUTY detection circuit which detects a 100% DUTY state of a PWM comparator, a power supply voltage rise detection circuit which detects a rise in a power supply voltage, and a discharge control circuit which lowers an output voltage of an error amplifier. The DC-DC converter is configured to lower the output voltage of the error amplifier when a power supply voltage rise detection signal is outputted where a 100% DUTY state is reached and the output voltage of the error amplifier is higher than a predetermined voltage.Type: ApplicationFiled: November 23, 2015Publication date: June 2, 2016Inventors: Hiroyuki MASUKO, Kosuke TAKADA, Michiyasu DEGUCHI
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Patent number: 9293990Abstract: A switching regulator is provided which can prevent overshooting in an output voltage even when a source voltage is returned to a normal voltage from a voltage lower than a desired output voltage of the switching regulator. The switching regulator includes a 100% duty detector circuit that detects that a PWM comparator is in a 100%-duty state and a discharge accelerator circuit that detects that the output of an error amplifier discharges the voltage of a phase compensating capacitor and that accelerates the discharge, and activates the discharge accelerator circuit when the 100% duty detector circuit detects the 100%-duty state.Type: GrantFiled: December 17, 2014Date of Patent: March 22, 2016Assignee: SEIKO INSTRUMENTS INC.Inventors: Kosuke Takada, Michiyasu Deguchi, Hiroyuki Masuko
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Patent number: 9270162Abstract: There is provided a switching regulator including an overcurrent protection circuit which is able to automatically return from an overcurrent state. The switching regulator includes an error amplification circuit which amplifies a difference between a feedback voltage and a reference voltage based on an output voltage and outputs the amplified difference; a PWM comparator which compares an output of the error amplification circuit with an output of a triangular wave oscillation circuit, and controls an output transistor; an overcurrent detection circuit which monitors a load current flowing through a load connected to an output terminal, detects that the load current is an overcurrent, and outputs an overcurrent detection signal causing a switching operation to stop; and a negative feedback control circuit which receives the overcurrent detection signal, and controls the load current to a predetermined current value.Type: GrantFiled: March 3, 2014Date of Patent: February 23, 2016Assignee: SEIKO INSTRUMENTS INC.Inventors: Akihiro Kawano, Michiyasu Deguchi
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Publication number: 20150222180Abstract: Provided is a switching regulator configured to achieve a 100% Duty state and reduce an occurrence of an overshoot. The switching regulator has a configuration in which a clamp circuit configured to dynamically generate a clamp level clamps an output voltage of an error amplifier in accordance with a peak value of a triangular wave signal.Type: ApplicationFiled: January 30, 2015Publication date: August 6, 2015Inventors: Michiyasu DEGUCHI, Kosuke TAKADA, Tetsuya MAKINO
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Publication number: 20150180335Abstract: A switching regulator is provided which can prevent overshooting in an output voltage even when a source voltage is returned to a normal voltage from a voltage lower than a desired output voltage of the switching regulator. The switching regulator includes a 100% duty detector circuit that detects that a PWM comparator is in a 100%-duty state and a discharge accelerator circuit that detects that the output of an error amplifier discharges the voltage of a phase compensating capacitor and that accelerates the discharge, and activates the discharge accelerator circuit when the 100% duty detector circuit detects the 100%-duty state.Type: ApplicationFiled: December 17, 2014Publication date: June 25, 2015Inventors: Kosuke TAKADA, Michiyasu DEGUCHI, Hiroyuki MASUKO
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Patent number: 9030180Abstract: In order to provide a switching regulator having high efficiency even under light load, the switching regulator is configured so that ON/OFF of a switching element is controlled by an output signal of an oscillation circuit having an oscillation frequency controlled by an output signal from an error amplifier. Thereby, the oscillation frequency can be suppressed under light load, thus reducing a switching loss.Type: GrantFiled: June 1, 2012Date of Patent: May 12, 2015Assignee: Seiko Instruments Inc.Inventors: Michiyasu Deguchi, Kenji Yoshida
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Publication number: 20140247523Abstract: There is provided a switching regulator including an overcurrent protection circuit which is able to automatically return from an overcurrent state. The switching regulator includes an error amplification circuit which amplifies a difference between a feedback voltage and a reference voltage based on an output voltage and outputs the amplified difference; a PWM comparator which compares an output of the error amplification circuit with an output of a triangular wave oscillation circuit, and controls an output transistor; an overcurrent detection circuit which monitors a load current flowing through a load connected to an output terminal, detects that the load current is an overcurrent, and outputs an overcurrent detection signal causing a switching operation to stop; and a negative feedback control circuit which receives the overcurrent detection signal, and controls the load current to a predetermined current value.Type: ApplicationFiled: March 3, 2014Publication date: September 4, 2014Applicant: Seiko Instruments Inc.Inventors: Akihiro KAWANO, Michiyasu DEGUCHI
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Patent number: 8729878Abstract: Provided is a switching regulator including an overload protection circuit, which has high accuracy even without requiring adjusting means in a test step. The switching regulator includes: a first triangle wave generation circuit for generating a first triangle wave which controls Duty of a PWM signal; and a second triangle wave generation circuit for generating a second triangle wave for overload detection, which has a crest value smaller than that of the first triangle wave. A ratio between the crest value of the first triangle wave and the crest value of the second triangle wave is set based on respective capacitances or constant currents thereof.Type: GrantFiled: January 24, 2012Date of Patent: May 20, 2014Assignee: Seiko Instruments Inc.Inventor: Michiyasu Deguchi
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Patent number: 8692536Abstract: Provided is a switching regulator including a circuit for detecting a short-circuit state easily and reliably, without the need of an adjustment step such as trimming. In accordance with a drive signal of a power switching element of the switching regulator, a discharge circuit is controlled. When the power switching element is short-circuited and becomes the ON state all the time, the discharge circuit stops its operation, and a capacitor is continuously charged. A voltage detection circuit detects that a charge voltage of the capacitor has reached a predetermined potential, to thereby detect the short-circuit state.Type: GrantFiled: February 7, 2013Date of Patent: April 8, 2014Assignee: Seiko Instruments Inc.Inventor: Michiyasu Deguchi
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Patent number: 8508196Abstract: Provided is a switching regulator capable of performing stable start-up with a soft-start operation without causing excessive extension of a soft-start time period. In a start-up period, a voltage approximating a feedback voltage (FB) is provided as an initial value of a soft-start reference voltage. The feedback voltage (FB) and the soft-start reference voltage become substantially equal to each other at a moment when the start-up is completed, to thereby realize a smooth transition of an operating state from the start-up to normal control.Type: GrantFiled: January 21, 2011Date of Patent: August 13, 2013Assignee: Seiko Instruments Inc.Inventor: Michiyasu Deguchi
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Publication number: 20120313601Abstract: In order to provide a switching regulator having high efficiency even under light load, the switching regulator is configured so that ON/OFF of a switching element is controlled by an output signal of an oscillation circuit having an oscillation frequency controlled by an output signal from an error amplifier. Thereby, the oscillation frequency can be suppressed under light load, thus reducing a switching loss.Type: ApplicationFiled: June 1, 2012Publication date: December 13, 2012Inventors: Michiyasu DEGUCHI, Kenji YOSHIDA
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Publication number: 20120194154Abstract: Provided is a switching regulator including an overload protection circuit, which has high accuracy even without requiring adjusting means in a test step. The switching regulator includes: a first triangle wave generation circuit for generating a first triangle wave which controls Duty of a PWM signal; and a second triangle wave generation circuit for generating a second triangle wave for overload detection, which has a crest value smaller than that of the first triangle wave. A ratio between the crest value of the first triangle wave and the crest value of the second triangle wave is set based on respective capacitances or constant currents thereof.Type: ApplicationFiled: January 24, 2012Publication date: August 2, 2012Inventor: Michiyasu Deguchi