Patents by Inventor Takatsugu Wachi
Takatsugu Wachi 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: 20240079959Abstract: A power supply semiconductor device includes: first and second external terminals connected to positive and negative electrodes of input capacitor via first and second external current paths, respectively; third and fourth external terminals connected to the positive and negative electrodes of the input capacitor via third and fourth external current paths, respectively; first and second transistors provided between the first and second external terminals; third and fourth transistors provided between the third external terminal and the fourth external terminal; switch terminal commonly connected to connection node between the first and second transistors and connection node between the third and fourth transistors; and drive control circuit performing switching control to alternately turn on and off a set of the first and third transistors and a set of the second and fourth transistors, thereby generating a switching voltage at the switch terminal based on voltage across the input capacitor.Type: ApplicationFiled: August 2, 2023Publication date: March 7, 2024Inventor: Takatsugu WACHI
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Publication number: 20230412077Abstract: A switching power supply circuit includes: a switching circuit switching an input voltage; a first amplifier generating a first voltage; a first phase compensation circuit including a first capacitor and compensating for a phase of the first voltage; a second amplifier generating a second voltage; a second phase compensation circuit including a second capacitor and compensating for a phase of the second voltage; and a drive control circuit executing a switching operation according to the second voltage, wherein the switching power supply circuit operates in a first or second mode, the drive control circuit performs, in the first mode, the switching operation, and stops, in the second mode, the switching operation, and when returning from the second mode to the first mode, a specific voltage corresponding to an output voltage is supplied to the second capacitor and a predetermined voltage is supplied to the first capacitor.Type: ApplicationFiled: May 18, 2023Publication date: December 21, 2023Inventors: Hiroto OSHITA, Takatsugu WACHI, Yosuke FUKUMOTO
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Publication number: 20220239215Abstract: The present disclosure provides a power supply control device. The power supply control device includes an error amplifier, generating an error voltage according to a difference between a feedback voltage and a reference voltage; a slope voltage generation circuit, generating a slope voltage of a lamp waveform according to an inductor current; a reference voltage generation circuit, generating the reference voltage that depends on an output voltage; a first comparator, generating a reset signal by comparing the error voltage and the slope voltage; a second comparator, generating a skip signal by comparing the error voltage and the reference voltage; an oscillator, generating a set signal; and a controller, receiving an input of each of the signals (set, reset and skip) and performing a switching drive of an output stage in either a fixed on-time control operation or a fixed frequency current mode operation.Type: ApplicationFiled: January 7, 2022Publication date: July 28, 2022Inventors: Takatsugu Wachi, Shidong GUAN
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Patent number: 10892684Abstract: An output transistor is made to perform switching operation synchronous with a clock signal in a current mode based on an error voltage, which is commensurate with the difference between a feedback voltage commensurate with an output voltage and a reference voltage, and a slope voltage, which is commensurate with a current that passes through the output transistor. Based on the result of comparison of the error voltage with a skip threshold voltage, a skip signal is generated. When the skip signal turns to high level in response to a light load, the switching operation is stopped. Thereafter, when the skip signal turns back to low level, the output transistor is turned on asynchronously with the clock signal.Type: GrantFiled: November 21, 2019Date of Patent: January 12, 2021Assignee: Rohm Co., Ltd.Inventors: Takatsugu Wachi, George G. Tan, Jr.
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Publication number: 20200169174Abstract: An output transistor is made to perform switching operation synchronous with a clock signal in a current mode based on an error voltage, which is commensurate with the difference between a feedback voltage commensurate with an output voltage and a reference voltage, and a slope voltage, which is commensurate with a current that passes through the output transistor. Based on the result of comparison of the error voltage with a skip threshold voltage, a skip signal is generated. When the skip signal turns to high level in response to a light load, the switching operation is stopped. Thereafter, when the skip signal turns back to low level, the output transistor is turned on asynchronously with the clock signal.Type: ApplicationFiled: November 21, 2019Publication date: May 28, 2020Inventors: Takatsugu Wachi, George G. TAN
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Patent number: 10075073Abstract: A DC/DC converter has: a soft-start circuit, a variable output current generator, a constant current source, an oscillator, a slope circuit, a PWM comparator, and a control circuit operable to turn ON and OFF first and second transistors alternately based on a pulse width modulation signal. Through the switching operation of the first and second transistors, an input voltage is converted into a output voltage.Type: GrantFiled: September 8, 2016Date of Patent: September 11, 2018Assignee: Rohm Co., Ltd.Inventors: Shidong Guan, Takatsugu Wachi, Yoshio Higashida, Takehiro Yoshida
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Publication number: 20170070149Abstract: A DC/DC converter has: a soft-start circuit generating a soft-start input voltage increasing gradually; an error amplifier generating an error signal by comparing an output voltage or a feedback voltage with a reference voltage or the soft-start input voltage, whichever is lower; a variable current generator generating a variable current proportional to the soft-start input voltage or a soft-start output voltage; a constant current source generating a bias current; an oscillator generating a rectangular-wave signal whose frequency varies linearly with a soft-start current which is the sum of the variable current and the bias current; a slope circuit generating a slope signal based on the rectangular-wave signal; a PWM comparator generating a PWM signal based on the error signal and the slope signal; and a control circuit switching transistors alternately based on the PWM signal. Through switching operation of the transistors, an input voltage is converted into the output voltage.Type: ApplicationFiled: September 8, 2016Publication date: March 9, 2017Inventors: Shidong Guan, Takatsugu Wachi, Yoshio Higashida, Takehiro Yoshida
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Patent number: 8653800Abstract: The step-up DC/DC converter (30) of the present invention has a synchronous rectifier transistor (M1); an output transistor (M2); a first back-gate control transistor (M3) connected between an external terminal (T2) and a back gate of the synchronous rectifier transistor (M1); a discharge transistor (M6) connected between the external terminal (T2) and a ground terminal; and a control unit (X1) for controlling the on/off state of the components described above. The control unit (X1) switches off the first back-gate control transistor (M3) and switches on the discharge transistor (M6) when stopping the switching operation of the output transistor (M2) and the synchronous rectifier transistor (M1).Type: GrantFiled: June 2, 2010Date of Patent: February 18, 2014Assignee: Rohm Co., Ltd.Inventors: Takatsugu Wachi, Masashi Nagasato, Yuki Iwata
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Patent number: 8330440Abstract: A power supply device is provided with an output transistor for outputting a switch voltage having a rectangular waveform, based on an input signal by being switching-controlled by a pulse width modulation signal; a reference voltage generating circuit for generating a prescribed reference voltage; an error amplifier wherein a feedback voltage depending on the switch voltage and the reference voltage are inputted, an error voltage is generated by amplifying a difference between the voltages, and changes a gain of itself, in accordance with a current signal generated inside based on the feedback voltage and the reference voltage; an oscillator for generating an oscillation signal; and a comparator wherein the oscillation signal and the error voltages are inputted and the pulse width modulation signal is outputted by comparing the voltages.Type: GrantFiled: October 16, 2008Date of Patent: December 11, 2012Assignee: Rohm Co., Ltd.Inventor: Takatsugu Wachi
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Publication number: 20100308655Abstract: The step-up DC/DC converter (30) of the present invention has a synchronous rectifier transistor (M1); an output transistor (M2); a first back-gate control transistor (M3) connected between an external terminal (T2) and a back gate of the synchronous rectifier transistor (M1); a discharge transistor (M6) connected between the external terminal (T2) and a ground terminal; and a control unit (X1) for controlling the on/off state of the components described above. The control unit (X1) switches off the first back-gate control transistor (M3) and switches on the discharge transistor (M6) when stopping the switching operation of the output transistor (M2) and the synchronous rectifier transistor (M1).Type: ApplicationFiled: June 2, 2010Publication date: December 9, 2010Applicant: Rohm Co., Ltd.Inventors: Takatsugu Wachi, Masashi Nagasato, Yuki Iwata
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Publication number: 20100176776Abstract: A power supply device is provided with an output transistor for outputting a switch voltage having a rectangular waveform, based on an input signal by being switching-controlled by a pulse width modulation signal; a reference voltage generating circuit for generating a prescribed reference voltage; an error amplifier wherein a feedback voltage depending on the switch voltage and the reference voltage are inputted, an error voltage is generated by amplifying a difference between the voltages, and changes a gain of itself, in accordance with a current signal generated inside based on the feedback voltage and the reference voltage; an oscillator for generating an oscillation signal; and a comparator wherein the oscillation signal and the error voltages are inputted and the pulse width modulation signal is outputted by comparing the voltages.Type: ApplicationFiled: October 16, 2008Publication date: July 15, 2010Applicant: ROHM CO., LTD.Inventor: Takatsugu Wachi
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Patent number: 7176701Abstract: A temperature sensor including two transistors having different emitter current densities and performing temperature detection based on the fact that the difference in voltage between base and emitter changes with temperature. The temperature sensor is provided with a feedback circuit for controlling respective collector voltages and emitter currents such that the collector voltages of both transistors vary according to similar temperature characteristics.Type: GrantFiled: March 10, 2003Date of Patent: February 13, 2007Assignee: Rohm Co., Ltd.Inventors: Takatsugu Wachi, Akira Nakamura
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Publication number: 20050104151Abstract: A temperature sensor comprising two transistors having different emitter current densities and performing temperature detection based on the fact that the difference in voltage between base and emitter changes with temperature. The temperature sensor is provided with a feedback circuit for controlling respective collector voltages and emitter currents such that the collector voltages of both transistors vary according to similar temperature characteristics.Type: ApplicationFiled: March 10, 2003Publication date: May 19, 2005Inventors: Takatsugu Wachi, Akira Nakamura