Patents by Inventor Masaki Omi
Masaki Omi 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).
-
Patent number: 9862239Abstract: An antenna driving device includes an antenna driving circuit arranged to generate driving current of a transmission antenna, a power supply circuit arranged to generate an output voltage from an input voltage so as to supply the output voltage to the antenna driving circuit, and a logic circuit arranged to control the antenna driving circuit and the power supply circuit. The power supply circuit has a function of temporarily disabling current feedback control so as to perform voltage feedback control using a reference value just before halting the drive of the transmission antenna when the power supply circuit restarts to drive the transmission antenna, or has a function of performing variable control of a reference value for current feedback control in accordance with a rising edge of the driving current when the power supply circuit restarts to drive the transmission antenna.Type: GrantFiled: October 20, 2016Date of Patent: January 9, 2018Assignee: Rohm Co., Ltd.Inventors: Naoki Takahashi, Masaki Omi, Muga Imamura, Yohei Okuno
-
Publication number: 20170036498Abstract: An antenna driving device includes an antenna driving circuit arranged to generate driving current of a transmission antenna, a power supply circuit arranged to generate an output voltage from an input voltage so as to supply the output voltage to the antenna driving circuit, and a logic circuit arranged to control the antenna driving circuit and the power supply circuit. The power supply circuit has a function of temporarily disabling current feedback control so as to perform voltage feedback control using a reference value just before halting the drive of the transmission antenna when the power supply circuit restarts to drive the transmission antenna, or has a function of performing variable control of a reference value for current feedback control in accordance with a rising edge of the driving current when the power supply circuit restarts to drive the transmission antenna.Type: ApplicationFiled: October 20, 2016Publication date: February 9, 2017Inventors: Naoki Takahashi, Masaki Omi, Muga Imamura, Yohei Okuno
-
Patent number: 9502756Abstract: An antenna driving device includes an antenna driving circuit arranged to generate driving current of a transmission antenna, a power supply circuit arranged to generate an output voltage from an input voltage so as to supply the output voltage to the antenna driving circuit, and a logic circuit arranged to control the antenna driving circuit and the power supply circuit. The power supply circuit has a function of temporarily disabling current feedback control so as to perform voltage feedback control using a reference value just before halting the drive of the transmission antenna when the power supply circuit restarts to drive the transmission antenna, or has a function of performing variable control of a reference value for current feedback control in accordance with a rising edge of the driving current when the power supply circuit restarts to drive the transmission antenna.Type: GrantFiled: September 17, 2014Date of Patent: November 22, 2016Assignee: Rohm Co., Ltd.Inventors: Naoki Takahashi, Masaki Omi, Muga Imamura, Yohei Okuno
-
Patent number: 9148917Abstract: A load driving device includes a switch element configured to generate an output voltage to a load from an input voltage depending on an ON/OFF operation thereof, a switch controller configured to control the ON/OFF operation of the switch element such that a feedback voltage obtained by subtracting a dropped voltage of the load from the output voltage and a predetermined reference voltage are maintained to be consistent, and a variable current source configured to perform ON/OFF controlling of a driving current flowing to the load in response to a driving current control signal. When the switch element is in an ON state at an OFF timing of the driving current, the switch controller maintains the switch element in the ON state thereafter, and turns off the switch element when the ON period of the switch element reaches a predetermined period.Type: GrantFiled: January 20, 2012Date of Patent: September 29, 2015Assignee: Rohm Co., Ltd.Inventors: Masaki Omi, Fumihiko Terasaki
-
Publication number: 20150079914Abstract: An antenna driving device includes an antenna driving circuit arranged to generate driving current of a transmission antenna, a power supply circuit arranged to generate an output voltage from an input voltage so as to supply the output voltage to the antenna driving circuit, and a logic circuit arranged to control the antenna driving circuit and the power supply circuit. The power supply circuit has a function of temporarily disabling current feedback control so as to perform voltage feedback control using a reference value just before halting the drive of the transmission antenna when the power supply circuit restarts to drive the transmission antenna, or has a function of performing variable control of a reference value for current feedback control in accordance with a rising edge of the driving current when the power supply circuit restarts to drive the transmission antenna.Type: ApplicationFiled: September 17, 2014Publication date: March 19, 2015Inventors: Naoki Takahashi, Masaki Omi, Muga Imamura, Yohei Okuno
-
Publication number: 20140354345Abstract: A switch control circuit that includes a control unit configured to generate a control signal; a switch driving unit configured to drive a switch element based on the control signal; and a slew rate adjusting unit configured to control the switch driving unit to change a slew rate of the switch element periodically in a predetermined change pattern.Type: ApplicationFiled: May 29, 2014Publication date: December 4, 2014Applicant: Rohm Co., Ltd.Inventors: Kei Nagao, Masaki Omi
-
Patent number: 8723442Abstract: A drive unit has a load driving portion driving a load by a PWM drive method; a soft-start function portion for achieving a soft-start function; and a soft-start disabling portion counting a time elapsed after a PWM signal is turned on at start-up of the unit, and disabling the soft-start function when a count value reaches a predetermined value.Type: GrantFiled: February 28, 2013Date of Patent: May 13, 2014Assignee: Rohm Co., Ltd.Inventor: Masaki Omi
-
Patent number: 8405321Abstract: A drive unit has a load driving portion driving a load by a PWM drive method; a soft-start function portion for achieving a soft-start function; and a soft-start disabling portion counting a time elapsed after a PWM signal is turned on at start-up of the unit, and disabling the soft-start function when a count value reaches a predetermined value.Type: GrantFiled: July 24, 2008Date of Patent: March 26, 2013Assignee: Rohm Co., Ltd.Inventor: Masaki Omi
-
Publication number: 20120187858Abstract: A load driving device includes a switch element configured to generate an output voltage to a load from an input voltage depending on an ON/OFF operation thereof, a switch controller configured to control the ON/OFF operation of the switch element such that a feedback voltage obtained by subtracting a dropped voltage of the load from the output voltage and a predetermined reference voltage are maintained to be consistent, and a variable current source configured to perform ON/OFF controlling of a driving current flowing to the load in response to a driving current control signal. When the switch element is in an ON state at an OFF timing of the driving current, the switch controller maintains the switch element in the ON state thereafter, and turns off the switch element when the ON period of the switch element reaches a predetermined period.Type: ApplicationFiled: January 20, 2012Publication date: July 26, 2012Applicant: ROHM CO., LTD.Inventors: Masaki Omi, Fumihiko Terasaki
-
Patent number: 8169207Abstract: A power supply device has an error amplifier producing an error voltage by amplifying a difference between a feedback voltage according to an output voltage and a predetermined reference voltage, an output portion producing a desired output voltage from an input voltage in such a way that the error voltage is reduced, and a clamping portion setting, during a predetermined period after startup of the power supply device, an upper limit of the error voltage to a value that is lower than a value obtained at normal times, such that the lower the input voltage the higher the upper limit, the higher the input voltage the lower the upper limit.Type: GrantFiled: August 5, 2008Date of Patent: May 1, 2012Assignee: Rohm Co., Ltd.Inventor: Masaki Omi
-
Publication number: 20110298384Abstract: A LED driving device 200 includes a LED driving IC 100, an inductor L1, a diode D1, a capacitor C1, and a backlight BL. The LED driving IC 100 includes an output control circuit 10 which generates a switching signal SD to convert an input voltage VIN to an output voltage VOUT supplied to a LED. The output control circuit 10 also generates a feedback voltage VR based on a terminal voltage inputted from the LED (i.e., a feedback input voltage). The LED driving IC 100 also includes a switching pulse adjustment circuit 30 to generate a third control signal SB and to provide the signal to the output control circuit 10. The third control signal SB is an adjusted signal of an ON time of the first control signal SA, based on the second control signal SC and the feedback voltage VR. The LED driving IC 100 also includes a signal judgment part 20 to generate a second control signal SC based on the first control signal SA.Type: ApplicationFiled: June 3, 2011Publication date: December 8, 2011Applicant: ROHM CO., LTD.Inventors: Hiroyuki Tanigawa, Masaki Omi
-
Patent number: 7893673Abstract: A step-up switching power supply device with synchronous rectification includes a first switch that is turned on at startup of the device and a second switch that is turned on when an output voltage reaches an input voltage, the first and seconds switches being connected in parallel between the back gate and the source of a synchronous rectifier transistor.Type: GrantFiled: February 27, 2008Date of Patent: February 22, 2011Assignee: Rohm Co., Ltd.Inventor: Masaki Omi
-
Patent number: 7868602Abstract: A power supply device includes a clamp circuit that increases the upper limit value of an error voltage stepwise after the device is started up. This makes it possible to shorten the rise time of an output voltage and to reduce the maximum current at start-up.Type: GrantFiled: December 26, 2006Date of Patent: January 11, 2011Assignee: Rohm Co., Ltd.Inventors: Masaki Omi, Toru Takahashi
-
Patent number: 7759911Abstract: A switching regulator comprises a reverse current detecting transistor (P2) having a gate and a source between which a voltage across a synchronous-rectification transistor (P1) is applied. When the reverse current detecting transistor (P2) comes into an open or closed state (on-state) indicating detection of a reverse current during an on-period of the synchronous-rectification transistor (P1), the synchronous-rectification transistor (P1) is turned off even before the end of the on period.Type: GrantFiled: April 18, 2006Date of Patent: July 20, 2010Assignee: Rohm Co., Ltd.Inventor: Masaki Omi
-
Patent number: 7750617Abstract: A switching regulator (20) includes a sense resistor (Rs), a sense current generating circuit (213) for generating a sense current (Isense) commensurate with a sense voltage (Vsense), a slope current generating circuit (214) for generating a slope current (Islope) with a ramped or triangular waveform, a slope voltage generating circuit (215) for generating a slope voltage (Vslope) commensurate with a summed current (Isense plus Islope), an error amplifier (ERR) for generating an error voltage (Verr) commensurate with an error of an output, a comparator (CMP) for comparing the error voltage (Verr) with the slope voltage (Vslope) to generate a PWM signal and a switching control section (CTRL) for turning on and off an output transistor (N1) based on the PWM signal.Type: GrantFiled: April 18, 2006Date of Patent: July 6, 2010Assignee: Rohm Co., Ltd.Inventor: Masaki Omi
-
Patent number: 7750609Abstract: A switching power supply IC (21) is provided with, in a form integrated into an integrated circuit: a terminal (T2) whereupon an input voltage (Vin) is applied through an inductor (Lex); a terminal (T3) from which an output voltage (Vout) for a loading LED is extracted; a transistor (N1) connected between the terminal (T2) and a grounding end; a transistor (P1) connected between the terminal (T2) and the terminal (T3); a transistor (P2) connected between the terminal (T3) and a backgate of the transistor (P1); and a switching control section (CTRL) for performing switching control to each transistor. During a step-up operation, the switching control section (CTRL) controls the switching of the transistors (N1, P1) complementarily to each other while continuously keeping the transistor (P2) on, and turns off all of the transistors (N1, P1, P2) when a step-up operation is stopped.Type: GrantFiled: April 20, 2006Date of Patent: July 6, 2010Assignee: Rohm Co., Ltd.Inventor: Masaki Omi
-
Publication number: 20090278521Abstract: In a power supply device of the present invention, a clamp circuit increases the upper limit value of an error voltage stepwise after the device is started up. This makes it possible to shorten the rise time of an output voltage and to reduce the maximum current at start-up.Type: ApplicationFiled: December 26, 2006Publication date: November 12, 2009Applicant: Rohm Co., Ltd.Inventors: Masaki Omi, Toru Takahashi
-
Publication number: 20090268492Abstract: A switching regulator (20) according to the present invention includes a sense resistor (Rs), a sense current generating circuit (213) for generating a sense current (Isense) commensurate with a sense voltage (Vsense), a slope current generating circuit (214) for generating a slope current (Islope) with a ramped or triangular waveform, a slope voltage generating circuit (215) for generating a slope voltage (Vslope) commensurate with a summed current (Isense plus Islope), an error amplifier (ERR) for generating an error voltage (Verr) commensurate with an error of an output, a comparator (CMP) for comparing the error voltage (Verr) with the slope voltage (Vslope) to generate a PWM signal and a switching control section (CTRL) for turning on and off an output transistor (N1) based on the PWM signal.Type: ApplicationFiled: April 18, 2006Publication date: October 29, 2009Applicant: ROHM CO., LTD.Inventor: Masaki Omi
-
Publication number: 20090251118Abstract: A switching power supply IC (21) is provided with, in a form integrated into an integrated circuit: a terminal (T2) whereupon an input voltage (Vin) is applied through an inductor (Lex); a terminal (T3) from which an output voltage (Vout) for a loading LED is extracted; a transistor (N1) connected between the terminal (T2) and a grounding end; a transistor (P1) connected between the terminal (T2) and the terminal (T3); a transistor (P2) connected between the terminal (T3) and a backgate of the transistor (P1); and a switching control section (CTRL) for performing switching control to each transistor. During a step-up operation, the switching control section (CTRL) controls the switching of the transistors (N1, P1) complementarily to each other while continuously keeping the transistor (P2) on, and turns off all of the transistors (N1, P1, P2) when a step-up operation is stopped.Type: ApplicationFiled: April 20, 2006Publication date: October 8, 2009Applicant: ROHM CO., LTD.Inventor: Masaki Omi
-
Publication number: 20090091308Abstract: A switching regulator (20) comprises a reverse current detecting transistor (P2) having a gate and a source between which a voltage across a synchronous-rectification transistor (P1) is applied. When the reverse current detecting transistor (P2) comes into an open or closed state (on-state) indicating detection of a reverse current during an on-period of the synchronous-rectification transistor (P1), the synchronous-rectification transistor (P1) is turned off even before the end of the on period.Type: ApplicationFiled: April 18, 2006Publication date: April 9, 2009Applicant: Rohm Co., Ltd.Inventor: Masaki Omi