Patents by Inventor Genki Tsuruyama
Genki Tsuruyama 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: 20230179097Abstract: The present disclosure provides a switching power device. A control unit of the switching power device includes a first state, a second state, a third state and a fourth state. In the first state, a first switch is turned on, and a second switch is turned off. In the second state, the first switch is turned off, and the second switch is turned on. In the third state, the first and second switches are turned off. In the fourth state, a voltage of a connection node of the first and second switches is less than that in the third state. The control unit repeats the first state, the second state, the third state, and the fourth state, and lengthens a period of the fourth state as an input voltage increases.Type: ApplicationFiled: November 29, 2022Publication date: June 8, 2023Inventor: Genki Tsuruyama
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Publication number: 20230013839Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.Type: ApplicationFiled: September 16, 2022Publication date: January 19, 2023Inventors: Hiroto OSHITA, Tetsuo Tateishi, Yosuke Fukumoto, Yuhei Yamaguchi, Yoju IMAMURA, Genki Tsuruyama
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Patent number: 11532449Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.Type: GrantFiled: January 29, 2018Date of Patent: December 20, 2022Assignee: Rohm Co., Ltd.Inventors: Hiroto Oshita, Tetsuo Tateishi, Yosuke Fukumoto, Yuhei Yamaguchi, Yoju Imamura, Genki Tsuruyama
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Patent number: 11374556Abstract: A sequence circuit (1) includes a detector (2) that detects an occurrence of an event based on an input signal, an acceptor (4) that accepts the event whose occurrence has been detected by the detector, an inhibitor (4) that inhibits the acceptor from accepting another event for a first period using the acceptance of one event by the acceptor as a trigger, a clock pulse generator (3) that generates one or more clock pulses during a period after a second period shorter than the first period elapses from the start of the first period until the first period ends, a determiner (5) that determines a next state based on a current slate and the event accepted by the acceptor, and a latch (6) that latches the next state using the clock pulse. An output of the latch is the current state.Type: GrantFiled: October 1, 2018Date of Patent: June 28, 2022Assignee: Rohm Co., Ltd.Inventors: Genki Tsuruyama, Tetsuo Tateishi
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Publication number: 20200321947Abstract: A sequence circuit (1) includes a detector (2) that detects an occurrence of an event based on an input signal, an acceptor (4) that accepts the event whose occurrence has been detected by the detector, an inhibitor (4) that inhibits the acceptor from accepting another event for a first period using the acceptance of one event by the acceptor as a trigger, a clock pulse generator (3) that generates one or more clock pulses during a period after a second period shorter than the first period elapses from the start of the first period until the first period ends, a determiner (5) that determines a next state based on a current slate and the event accepted by the acceptor, and a latch (6) that latches the next state using the clock pulse. An output of the latch is the current state.Type: ApplicationFiled: October 1, 2018Publication date: October 8, 2020Applicant: ROHM CO., LTD.Inventors: Genki TSURUYAMA, Tetsuo TATEISHI
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Publication number: 20200083009Abstract: A pulse control device 10 comprises: a switch output unit 100 which generates a pulse output voltage Vo from a direct-current input voltage Vi and supplies the pulse output voltage Vo to a load (such as a relay coil 21 of a mechanical relay 20); a low-pass filter unit 300 which receives a feedback input of the pulse output voltage Vo and generates a feedback voltage Vfb; and an output feedback control unit 200 which receives an input of the feedback voltage Vfb and controls the switch output unit 100 so that an average value of the pulse output voltage Vo becomes constant. The low-pass filter unit 300 may be configured without a coil.Type: ApplicationFiled: January 29, 2018Publication date: March 12, 2020Applicant: ROHM CO., LTD.Inventors: Hiroto OSHITA, Tetsuo Tateishi, Yosuke Fukumoto, Yuhei Yamaguchi, Yoju IMAMURA, Genki Tsuruyama
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Patent number: 10498243Abstract: A comparator circuit includes a first comparator arranged to compare an input signal with a reference voltage so as to generate a first comparison signal, a second comparator arranged to compare the input signal with a variable reference voltage so as to generate a second comparison signal, a variable reference voltage generator arranged to generate the variable reference voltage, and a logic unit arranged to output one of the first comparison signal and the second comparison signal as a comparison signal. The logic unit outputs the first comparison signal as the comparison signal while controlling the variable reference voltage generator to sweep the variable reference voltage until the first comparison signal and the second comparison signal exhibit desired response behaviors, and moves to a state capable of outputting the second comparison signal as the comparison signal after the sweep of the variable reference voltage is completed.Type: GrantFiled: October 22, 2018Date of Patent: December 3, 2019Assignee: Rohm Co., Ltd.Inventors: Genki Tsuruyama, Tetsuo Tateishi
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Patent number: 10379564Abstract: A constant voltage generating circuit includes an ED-type reference voltage supply that generates a predetermined constant voltage by using a first transistor of depletion-type and a second transistor of enhancement-type that are connected in series between a power supply terminal and a ground terminal, and a third transistor a source of which is connected to an output terminal for the constant voltage, a drain of which is connected to the power supply terminal or the ground terminal, and a gate of which is connected to a connection node between the first transistor and the second transistor.Type: GrantFiled: May 9, 2018Date of Patent: August 13, 2019Assignee: Rohm Co., Ltd.Inventors: Kiyotaka Umemoto, Genki Tsuruyama
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Publication number: 20190058403Abstract: A comparator circuit includes a first comparator arranged to compare an input signal with a reference voltage so as to generate a first comparison signal, a second comparator arranged to compare the input signal with a variable reference voltage so as to generate a second comparison signal, a variable reference voltage generator arranged to generate the variable reference voltage, and a logic unit arranged to output one of the first comparison signal and the second comparison signal as a comparison signal. The logic unit outputs the first comparison signal as the comparison signal while controlling the variable reference voltage generator to sweep the variable reference voltage until the first comparison signal and the second comparison signal exhibit desired response behaviors, and moves to a state capable of outputting the second comparison signal as the comparison signal after the sweep of the variable reference voltage is completed.Type: ApplicationFiled: October 22, 2018Publication date: February 21, 2019Applicant: Rohm Co., Ltd.Inventors: Genki Tsuruyama, Tetsuo Tateishi
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Patent number: 10205393Abstract: A comparator circuit includes a first comparator, a second comparator, and a logic portion. The logic portion adjust a variable reference voltage input to the second comparator to become close to a reference voltage input to the first comparator, during a period from a time point when reverse current of current flowing in a coil disposed in a switching power supply device is detected in a state where a first comparison signal is output as a comparison signal while the first comparator and the second comparator are operated, until a first predetermined period of time elapses in a state where switching operation of the switching power supply device is stopped (excluding a period from a time point when the reverse current is detected until a second predetermined period of time shorter than the first predetermined period of time elapses).Type: GrantFiled: March 12, 2018Date of Patent: February 12, 2019Assignee: Rohm Co., Ltd.Inventors: Genki Tsuruyama, Tetsuo Tateishi
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Patent number: 10141850Abstract: A comparator circuit includes a first comparator arranged to compare an input signal with a reference voltage so as to generate a first comparison signal, a second comparator arranged to compare the input signal with a variable reference voltage so as to generate a second comparison signal, a variable reference voltage generator arranged to generate the variable reference voltage, and a logic unit arranged to output one of the first comparison signal and the second comparison signal as a comparison signal. The logic unit outputs the first comparison signal as the comparison signal while controlling the variable reference voltage generator to sweep the variable reference voltage until the first comparison signal and the second comparison signal exhibit desired response behaviors, and moves to a state capable of outputting the second comparison signal as the comparison signal after the sweep of the variable reference voltage is completed.Type: GrantFiled: April 8, 2016Date of Patent: November 27, 2018Assignee: Rohm Co., Ltd.Inventors: Genki Tsuruyama, Tetsuo Tateishi
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Publication number: 20180259991Abstract: A constant voltage generating circuit includes an ED-type reference voltage supply that generates a predetermined constant voltage by using a first transistor of depletion-type and a second transistor of enhancement-type that are connected in series between a power supply terminal and a ground terminal, and a third transistor a source of which is connected to an output terminal for the constant voltage, a drain of which is connected to the power supply terminal or the ground terminal, and a gate of which is connected to a connection node between the first transistor and the second transistor.Type: ApplicationFiled: May 9, 2018Publication date: September 13, 2018Applicant: ROHM CO., LTD.Inventors: Kiyotaka Umemoto, Genki Tsuruyama
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Publication number: 20180205316Abstract: A comparator circuit includes a first comparator, a second comparator, and a logic portion. The logic portion adjust a variable reference voltage input to the second comparator to become close to a reference voltage input to the first comparator, during a period from a time point when reverse current of current flowing in a coil disposed in a switching power supply device is detected in a state where a first comparison signal is output as a comparison signal while the first comparator and the second comparator are operated, until a first predetermined period of time elapses in a state where switching operation of the switching power supply device is stopped (excluding a period from a time point when the reverse current is detected until a second predetermined period of time shorter than the first predetermined period of time elapses).Type: ApplicationFiled: March 12, 2018Publication date: July 19, 2018Applicant: Rohm Co., Ltd.Inventors: Genki Tsuruyama, Tetsuo Tateishi
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Patent number: 9996097Abstract: A constant voltage generating circuit includes an ED-type reference voltage supply that generates a predetermined constant voltage by using a first transistor of depletion-type and a second transistor of enhancement-type that are connected in series between a power supply terminal and a ground terminal, and a third transistor a source of which is connected to an output terminal for the constant voltage, a drain of which is connected to the power supply terminal or the ground terminal, and a gate of which is connected to a connection node between the first transistor and the second transistor.Type: GrantFiled: February 1, 2016Date of Patent: June 12, 2018Assignee: Rohm Co., Ltd.Inventors: Kiyotaka Umemoto, Genki Tsuruyama
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Patent number: 9954442Abstract: A comparator circuit includes a first comparator, a second comparator, and a logic portion. The logic portion adjust a variable reference voltage input to the second comparator to become close to a reference voltage input to the first comparator, during a period from a time point when reverse current of current flowing in a coil disposed in a switching power supply device is detected in a state where a first comparison signal is output as a comparison signal while the first comparator and the second comparator are operated, until a first predetermined period of time elapses in a state where switching operation of the switching power supply device is stopped (excluding a period from a time point when the reverse current is detected until a second predetermined period of time shorter than the first predetermined period of time elapses).Type: GrantFiled: March 15, 2017Date of Patent: April 24, 2018Assignee: Rohm Co., Ltd.Inventors: Genki Tsuruyama, Tetsuo Tateishi
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Patent number: 9876426Abstract: An ON-period setting circuit is provided in a fixed-ON-period switching power supply device that produces a desired output voltage from an input voltage by driving a coil by turning ON and OFF an output transistor and a synchronous rectification transistor. The ON-period setting circuit shortens the ON period the more the lighter the load is in a discontinuous-current mode. Or, the ON-period setting circuit transiently shortens the ON period on completion of a transition from a discontinuous-current mode to a continuous-current mode.Type: GrantFiled: March 31, 2016Date of Patent: January 23, 2018Assignee: Rohm Co., Ltd.Inventors: Tetsuo Tateishi, Genki Tsuruyama
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Patent number: 9819895Abstract: A switching power supply device is a fixed on-time with bottom detection type switching power supply device, including an on-time extending portion, a low-side sensing type overcurrent protection portion using a bottom value threshold value, and a high-side sensing type overcurrent protection portion using a peak value threshold value. The high-side sensing type overcurrent protection portion sets the peak value threshold value to a value larger than the sum of the bottom value threshold value and a ripple component of inductor current during a period from start to end of a fixed on-time, and sets the peak value threshold value to a value equal to or smaller than the sum of the bottom value threshold value and the ripple component of the inductor current during a period after the fixed on-time elapses until at least the upper-side switch is turned off.Type: GrantFiled: March 10, 2017Date of Patent: November 14, 2017Assignee: Rohm Co., Ltd.Inventors: Tetsuo Tateishi, Genki Tsuruyama
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Publication number: 20170271991Abstract: A comparator circuit includes a first comparator, a second comparator, and a logic portion. The logic portion adjust a variable reference voltage input to the second comparator to become close to a reference voltage input to the first comparator, during a period from a time point when reverse current of current flowing in a coil disposed in a switching power supply device is detected in a state where a first comparison signal is output as a comparison signal while the first comparator and the second comparator are operated, until a first predetermined period of time elapses in a state where switching operation of the switching power supply device is stopped (excluding a period from a time point when the reverse current is detected until a second predetermined period of time shorter than the first predetermined period of time elapses).Type: ApplicationFiled: March 15, 2017Publication date: September 21, 2017Inventors: Genki TSURUYAMA, Tetsuo TATEISHI
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Publication number: 20170264853Abstract: A switching power supply device is a fixed on-time with bottom detection type switching power supply device, including an on-time extending portion, a low-side sensing type overcurrent protection portion using a bottom value threshold value, and a high-side sensing type overcurrent protection portion using a peak value threshold value. The high-side sensing type overcurrent protection portion sets the peak value threshold value to a value larger than the sum of the bottom value threshold value and a ripple component of inductor current during a period from start to end of a fixed on-time, and sets the peak value threshold value to a value equal to or smaller than the sum of the bottom value threshold value and the ripple component of the inductor current during a period after the fixed on-time elapses until at least the upper-side switch is turned off.Type: ApplicationFiled: March 10, 2017Publication date: September 14, 2017Inventors: Tetsuo TATEISHI, Genki TSURUYAMA
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Publication number: 20160322902Abstract: A comparator circuit includes a first comparator arranged to compare an input signal with a reference voltage so as to generate a first comparison signal, a second comparator arranged to compare the input signal with a variable reference voltage so as to generate a second comparison signal, a variable reference voltage generator arranged to generate the variable reference voltage, and a logic unit arranged to output one of the first comparison signal and the second comparison signal as a comparison signal. The logic unit outputs the first comparison signal as the comparison signal while controlling the variable reference voltage generator to sweep the variable reference voltage until the first comparison signal and the second comparison signal exhibit desired response behaviors, and moves to a state capable of outputting the second comparison signal as the comparison signal after the sweep of the variable reference voltage is completed.Type: ApplicationFiled: April 8, 2016Publication date: November 3, 2016Inventors: Genki TSURUYAMA, Tetsuo TATEISHI