Patents by Inventor Nobuyuki Ohtaka
Nobuyuki Ohtaka 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: 8305006Abstract: A light emitting element control circuit comprising: a variable current generation circuit configured to generate a variable current varying in a direction of increase or in a direction of decrease; a fixed current generation circuit configured to generate a fixed current smaller than a predetermined current of a light emitting element; and a mode setting circuit configured to selectively set a first mode of prohibiting supply of the variable current and the fixed current to the light emitting element, a second mode of supplying the variable current to the light emitting element, and a third mode of supplying the fixed current to the light emitting element, for the variable current generation circuit and the fixed current generation circuit.Type: GrantFiled: August 28, 2008Date of Patent: November 6, 2012Assignees: Semiconductor Components Industries, LLC, Sanyo Semiconductor Co., Ltd.Inventors: Takaaki Ishii, Nobuyuki Ohtaka
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Patent number: 8228005Abstract: A light-emitting-element driving circuit is provided which comprises a voltage boosting circuit unit which supplies a boosted voltage to a light-emitting element, a current circuit unit which drives the light-emitting element with a current, a normal feedback loop path through which a voltage of the light-emitting element is input as a feedback voltage to the voltage boosting circuit unit, a backup feedback loop path through which a voltage of the light-emitting element is input as the feedback voltage to the voltage boosting circuit unit, an abnormality detection circuit unit which compares the feedback voltage which is input through the normal feedback loop path to the voltage boosting circuit unit and a predetermined determination voltage, to detect abnormality, and a switching circuit which switches from the normal feedback loop path to the backup feedback loop path when the abnormality detection circuit unit has detected the abnormality.Type: GrantFiled: August 2, 2010Date of Patent: July 24, 2012Assignee: Semiconductor Components Industries, LLCInventors: Nobuyuki Ohtaka, Tomoshi Yoshida
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Patent number: 8203524Abstract: A light-emitting element driving circuit (10) comprises a luminosity determining unit (70) which determines luminosity, outputs a luminosity determination result, and outputs brightness change information, a brightness setting unit (60) which outputs brightness setting information and outputs brightness change information, a light-emitting element driving unit (40) which drives a light-emitting element with a current of a current value corresponding to the brightness setting information, a detecting and comparing unit (50) which compares a terminal voltage of the light-emitting element and a predetermined voltage, a voltage boost determining unit (30) which determines whether or not a terminal voltage of the light-emitting element is to be boosted based on at least one of the luminosity change information and the brightness change information, and a voltage boosting circuit section (20) which boosts the terminal voltage of the light-emitting element when it is determined that the voltage is to be boosted andType: GrantFiled: September 10, 2009Date of Patent: June 19, 2012Assignees: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.Inventors: Tomoshi Yoshida, Nobuyuki Ohtaka
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Patent number: 8093879Abstract: A semiconductor circuit (10a) comprises a first terminal section (17) to be connected to a connection point of two external resistors; a second terminal section (18) to be connected to an external circuit; a voltage circuit section having a first terminal connected to the second terminal section (18); a reference voltage circuit section (102) which outputs a predetermined voltage; an operational amplifier (104) having a first input terminal connected to the reference voltage circuit section (102), a second input terminal connected to the first terminal section (17), and an output terminal connected to a second terminal of the voltage circuit section; an abnormality detecting circuit which detects an abnormal voltage of the first terminal section (17); a normal signal generating unit (130) which generates a normal signal; and a switching circuit which, when the abnormality detecting circuit detects the abnormal voltage, does not output a voltage based on the first terminal section (17) to the second terminal sType: GrantFiled: September 14, 2009Date of Patent: January 10, 2012Assignees: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.Inventors: Ryuji Yamamoto, Nobuyuki Ohtaka
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Publication number: 20110025234Abstract: A light-emitting-element driving circuit is provided which comprises a voltage boosting circuit unit which supplies a boosted voltage to a light-emitting element, a current circuit unit which drives the light-emitting element with a current, a normal feedback loop path through which a voltage of the light-emitting element is input as a feedback voltage to the voltage boosting circuit unit, a backup feedback loop path through which a voltage of the light-emitting element is input as the feedback voltage to the voltage boosting circuit unit, an abnormality detection circuit unit which compares the feedback voltage which is input through the normal feedback loop path to the voltage boosting circuit unit and a predetermined determination voltage, to detect abnormality, and a switching circuit which switches from the normal feedback loop path to the backup feedback loop path when the abnormality detection circuit unit has detected the abnormality.Type: ApplicationFiled: August 2, 2010Publication date: February 3, 2011Applicants: SANYO ELECTRIC CO., LTD., SANYO SEMICONDUCTOR CO., LTD.Inventors: Nobuyuki OHTAKA, Tomoshi YOSHIDA
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Publication number: 20100066330Abstract: A semiconductor circuit (10a) comprises a first terminal section (17) to be connected to a connection point of two external resistors; a second terminal section (18) to be connected to an external circuit; a voltage circuit section having a first terminal connected to the second terminal section (18); a reference voltage circuit section (102) which outputs a predetermined voltage; an operational amplifier (104) having a first input terminal connected to the reference voltage circuit section (102), a second input terminal connected to the first terminal section (17), and an output terminal connected to a second terminal of the voltage circuit section; an abnormality detecting circuit which detects an abnormal voltage of the first terminal section (17); a normal signal generating unit (130) which generates a normal signal; and a switching circuit which, when the abnormality detecting circuit detects the abnormal voltage, does not output a voltage based on the first terminal section (17) to the second terminal sType: ApplicationFiled: September 14, 2009Publication date: March 18, 2010Applicants: SANYO ELECTRIC CO., LTD., SANYO SEMICONDUCTOR CO., LTD.Inventors: Ryuji Yamamoto, Nobuyuki Ohtaka
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Publication number: 20100060674Abstract: A light-emitting element driving circuit (10) comprises a luminosity determining unit (70) which determines luminosity, outputs a luminosity determination result, and outputs brightness change information, a brightness setting unit (60) which outputs brightness setting information and outputs brightness change information, a light-emitting element driving unit (40) which drives a light-emitting element with a current of a current value corresponding to the brightness setting information, a detecting and comparing unit (50) which compares a terminal voltage of the light-emitting element and a predetermined voltage, a voltage boost determining unit (30) which determines whether or not a terminal voltage of the light-emitting element is to be boosted based on at least one of the luminosity change information and the brightness change information, and a voltage boosting circuit section (20) which boosts the terminal voltage of the light-emitting element when it is determined that the voltage is to be boosted andType: ApplicationFiled: September 10, 2009Publication date: March 11, 2010Applicants: SANYO ELECTRIC CO., LTD., SANYO SEMICONDUCTOR CO., LTD.Inventors: Tomoshi Yoshida, Nobuyuki Ohtaka
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Patent number: 7573248Abstract: A power voltage of a battery (including a secondary battery) mounted on a portable device drops with use or the like of the portable device. Therefore, a step-up switching voltage regulator circuit is mounted on the portable device. On the other hand, the power voltage of the battery exceeds a voltage necessary for driving the portable device sometimes when the battery is fully charged. In this case, when the step-up switching voltage regulator circuit is driven, the power is consumed in vain, and a burden is imposed on the battery.Type: GrantFiled: August 26, 2005Date of Patent: August 11, 2009Assignee: Sanyo Electric Co., Ltd.Inventor: Nobuyuki Ohtaka
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Publication number: 20090066263Abstract: A light emitting element control circuit comprising: a variable current generation circuit configured to generate a variable current varying in a direction of increase or in a direction of decrease; a fixed current generation circuit configured to generate a fixed current smaller than a predetermined current of a light emitting element; and a mode setting circuit configured to selectively set a first mode of prohibiting supply of the variable current and the fixed current to the light emitting element, a second mode of supplying the variable current to the light emitting element, and a third mode of supplying the fixed current to the light emitting element, for the variable current generation circuit and the fixed current generation circuit.Type: ApplicationFiled: August 28, 2008Publication date: March 12, 2009Applicants: Sanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.Inventors: Takaaki Ishii, Nobuyuki Ohtaka
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Patent number: 7256552Abstract: An LED control circuit for controlling a plurality of LEDs with different emission colors comprises a counter which increments or decrements a count value at a predetermined clock in response to a count start signal externally supplied, a signal conversion circuit which converts the count value into an analog signal displaying intensity corresponding to the count value and outputs the analog signal as an output signal, a signal generation circuit which generates, based on the output signal from the signal conversion circuit and brightness data externally specified to its corresponding LED, an analog signal displaying intensity corresponding to a product of the output signal and the brightness data, and a driving circuit which drives its corresponding LED according to the analog signal output from the signal generation circuit, to gradually and simultaneously change the brightness of the LEDs in accordance with the count value.Type: GrantFiled: August 9, 2005Date of Patent: August 14, 2007Assignee: Sanyo Electric Co., Ltd.Inventors: Takaaki Ishii, Nobuyuki Ohtaka
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Publication number: 20060043931Abstract: A power voltage of a battery (including a secondary battery) mounted on a portable device drops with use or the like of the portable device. Therefore, a step-up switching voltage regulator circuit is mounted on the portable device. On the other hand, the power voltage of the battery exceeds a voltage necessary for driving the portable device sometimes when the battery is fully charged. In this case, when the step-up switching voltage regulator circuit is driven, the power is consumed in vain, and a burden is imposed on the battery.Type: ApplicationFiled: August 26, 2005Publication date: March 2, 2006Applicant: Sanyo Electric Co., Ltd.Inventor: Nobuyuki Ohtaka
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Publication number: 20060033443Abstract: An LED control circuit for controlling a plurality of LEDs with different emission colors comprises a counter which increments or decrements a count value at a predetermined clock in response to a count start signal externally supplied, a signal conversion circuit which converts the count value into an analog signal displaying intensity corresponding to the count value and outputs the analog signal as an output signal, a signal generation circuit which generates, based on the output signal from the signal conversion circuit and brightness data externally specified to its corresponding LED, an analog signal displaying intensity corresponding to a product of the output signal and the brightness data, and a driving circuit which drives its corresponding LED according to the analog signal output from the signal generation circuit, to gradually and simultaneously change the brightness of the LEDs in accordance with the count value.Type: ApplicationFiled: August 9, 2005Publication date: February 16, 2006Applicant: Sanyo Electric Co., Ltd.Inventors: Takaaki Ishii, Nobuyuki Ohtaka
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Publication number: 20050127984Abstract: The output voltage of a charge pump 10 is monitored by a voltage monitoring circuit. The operating current of a series regulator is restricted when the output voltage of the charge pump falls below a predetermined value. A power supply circuit is provided that is capable of effectively eliminating the decline in the output voltage of the charge pump.Type: ApplicationFiled: December 10, 2004Publication date: June 16, 2005Applicant: Sanyo Electric Co., Ltd.Inventor: Nobuyuki Ohtaka