Patents by Inventor Daisuke Yamahara
Daisuke Yamahara 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: 20220383671Abstract: A vehicle diagnostic device includes: a communication unit that communicates with a vehicle which drives autonomously; and a diagnostic unit that performs, via the communication unit, diagnosis as to whether the vehicle is being hacked. The diagnostic unit performs the diagnosis by checking resilience of software which runs a travel system provided in the vehicle.Type: ApplicationFiled: November 17, 2020Publication date: December 1, 2022Inventors: Hikaru MAEDA, Daisuke YAMAHARA, Koichi MITSUSHIMA
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Patent number: 10057967Abstract: A lighting device includes: a first lighting control circuit; a second lighting control circuit which controls the first lighting control circuit; a first control power supply which supplies a first voltage to the first lighting control circuit; a second control power supply to which the first voltage is supplied and which supplies a second voltage to the second lighting control circuit; and a reset circuit which (i) when the reset circuit detects that the first voltage decreases to a first threshold or lower, causes the second control power supply to stop supply of the second voltage, and (ii) when the reset circuit detects that the first voltage increases to a second threshold or higher and that the second voltage is higher than a third threshold, causes the second control power supply to start supply of the second voltage after the second voltage decreases to the third threshold or lower.Type: GrantFiled: January 23, 2018Date of Patent: August 21, 2018Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Daisuke Yamahara, Hiroyuki Asano, Satoshi Yagi, Koki Matsui
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Publication number: 20180235058Abstract: A lighting device includes: a first lighting control circuit; a second lighting control circuit which controls the first lighting control circuit; a first control power supply which supplies a first voltage to the first lighting control circuit; a second control power supply to which the first voltage is supplied and which supplies a second voltage to the second lighting control circuit; and a reset circuit which (i) when the reset circuit detects that the first voltage decreases to a first threshold or lower, causes the second control power supply to stop supply of the second voltage, and (ii) when the reset circuit detects that the first voltage increases to a second threshold or higher and that the second voltage is higher than a third threshold, causes the second control power supply to start supply of the second voltage after the second voltage decreases to the third threshold or lower.Type: ApplicationFiled: January 23, 2018Publication date: August 16, 2018Inventors: Daisuke YAMAHARA, Hiroyuki ASANO, Satoshi YAGI, Koki MATSUI
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Patent number: 9775202Abstract: Lighting apparatus which supplies a current to solid-state light-emitting device (LED) includes: DC power supply circuit (AC/DC converter); and DC/DC converter that converts an output voltage of DC power supply circuit and applies, to solid-state light-emitting device, the output voltage converted. DC/DC converter includes: switching element; and DC/DC control circuit that performs a control of repeatedly turning ON and OFF switching element in a boundary conduction mode, and DC power supply circuit adjusts the output voltage to make a switching frequency of switching element higher than a first frequency, based on a forward voltage to be applied to solid-state light-emitting device.Type: GrantFiled: August 12, 2015Date of Patent: September 26, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Keisuke Seki, Takeshi Kamoi, Daisuke Yamahara
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Patent number: 9763294Abstract: A lighting device includes a rectifier circuit, a conversion circuit, a constant current circuit and a control circuit. The conversion circuit includes a first series circuit, a second series circuit and a third series circuit. The conversion circuit is configured to output a DC current by on/off of a switching element being controlled by the control circuit. A high potential-side terminal of the third capacitor is electrically connected to an output terminal. The low potential-side terminal of the third capacitor is electrically connected to an output terminal, via the constant current circuit.Type: GrantFiled: November 18, 2015Date of Patent: September 12, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Masato Himeda, Hiroyuki Asano, Masafumi Yamamoto, Takeshi Kamoi, Daisuke Yamahara, Keisuke Seki, Katsuyuki Doi
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Patent number: 9723665Abstract: Lighting apparatus includes: AC/DC converter which converts AC voltage Vac to DC voltage Vdc; DC/DC converter which converts DC voltage Vdc to a DC voltage to be applied to LED; and detection circuit which detects AC voltage Vac. DC/DC converter includes switching element, and control circuit that performs a control of repeatedly turning on and off switching element in a boundary conduction mode. Control circuit performs the control under which ON time Ton is kept from exceeding an upper limit that is previously determined, and raises the upper limit when AC voltage Vac detected by detection circuit falls below a predetermined value. ON time Ton is a period of time during which switching element is kept ON.Type: GrantFiled: August 10, 2015Date of Patent: August 1, 2017Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Keisuke Seki, Takeshi Kamoi, Daisuke Yamahara
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Patent number: 9706615Abstract: A lighting device which outputs a current to a solid-state light emitting element includes: a direct current-to-direct current (DC-to-DC) converter; and an output detector which detects an output from the DC-to-DC converter, wherein the DC-to-DC converter includes: a switching element; a control device which controls the switching element in order to generate the output; and a current detector which detects a current which flows through the switching element, and if a current value of the current detected by the current detector is less than a predetermined threshold, the control device controls the switching element according to a duty cycle determined based on an output value of the output detected by the output detector, and if the current value is greater than the predetermined threshold, the control device controls the switching element according to a duty cycle lower than the duty cycle determined based on the output value.Type: GrantFiled: April 21, 2016Date of Patent: July 11, 2017Assignee: PANASONIC INTETTECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Keisuke Seki, Takeshi Kamoi, Daisuke Yamahara, Shun Kusuda
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Publication number: 20160323947Abstract: A lighting device which outputs a current to a solid-state light emitting element includes: a direct current-to-direct current (DC-to-DC) converter; and an output detector which detects an output from the DC-to-DC converter, wherein the DC-to-DC converter includes: a switching element; a control device which controls the switching element in order to generate the output; and a current detector which detects a current which flows through the switching element, and if a current value of the current detected by the current detector is less than a predetermined threshold, the control device controls the switching element according to a duty cycle determined based on an output value of the output detected by the output detector, and if the current value is greater than the predetermined threshold, the control device controls the switching element according to a duty cycle lower than the duty cycle determined based on the output value.Type: ApplicationFiled: April 21, 2016Publication date: November 3, 2016Inventors: Keisuke SEKI, Takeshi KAMOI, Daisuke YAMAHARA, Shun KUSUDA
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Patent number: 9456477Abstract: A lighting device includes a rectifier circuit, a conversion circuit and a control circuit. A first inductor of a first series circuit and a second inductor of a second series circuit have inductances by which a time period, during which a diode is electrically conducted, is made shorter than a half period of a resonance period of a closed loop circuit. The closed loop circuit includes a first capacitor, the first inductor, a second capacitor and a third capacitor. The control circuit is configured to control a switching element in such a manner that the switching element is turned on at fixed periods.Type: GrantFiled: November 18, 2015Date of Patent: September 27, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Keisuke Seki, Takeshi Kamoi, Daisuke Yamahara, Hiroyuki Asano, Masafumi Yamamoto, Masato Himeda, Katsuyuki Doi
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Patent number: 9414451Abstract: A lighting device includes a constant-current circuit, a smoothing capacitor, a bypass circuit, a detection unit, and a bypass control unit. The constant-current circuit supplies a constant current to a plurality of solid-state light-emitting elements connected in series. The smoothing capacitor is connected between output terminals of the constant-current circuit. The bypass circuit is connected in parallel to one or more of the plurality of solid-state light-emitting elements. The detection unit detects whether the one or more solid-state light-emitting elements are open-circuited. When the detection unit detects that at least one of the one or more solid-state light-emitting elements is open-circuited, the bypass control unit discharges the smoothing capacitor during a discharge period to then bypass the one or more solid-state light-emitting elements through the bypass circuit.Type: GrantFiled: December 17, 2014Date of Patent: August 9, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Keisuke Seki, Takeshi Kamoi, Daisuke Yamahara
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Patent number: 9392668Abstract: The lighting device according to the present invention includes a power supply circuit, a temperature detection circuit, and a temperature control circuit. The power supply circuit supplies operation power to a light source including a solid state light emitting device. The temperature detection circuit measures a surrounding temperature of the light source and outputs the measured surrounding temperature as a detection temperature. The temperature control circuit determines whether an increase rate of the surrounding temperature exceeds a predetermined criterion value. When determining that the increase rate exceeds the criterion value, the temperature control circuit performs a process of decreasing a temperature of the light source.Type: GrantFiled: February 14, 2014Date of Patent: July 12, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takeshi Kamoi, Hiroshi Kido, Akinori Hiramatu, Junichi Hasegawa, Shigeru Ido, Nobutoshi Matsuzaki, Daisuke Yamahara
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Patent number: 9380660Abstract: An electronic ballast includes an AC-DC converter, a DC-DC converter, a cooling device and a power supply. The cooling device is configured to cool the light source. The power supply includes a first power supply configured to generate a first operating voltage from a first voltage obtained from a chopper circuit included in the AC-DC converter to supply the first operating voltage to at least one of the AC-DC converter and the DC-DC converter. The power supply further includes a second power supply configured to generate a second operating voltage from a second voltage obtained from the chopper circuit to supply the second operating voltage to at least the cooling device of the AC-DC converter, the DC-DC converter and the cooling device.Type: GrantFiled: August 5, 2014Date of Patent: June 28, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Akinori Hiramatu, Daisuke Yamahara, Shigeru Ido, Junichi Hasegawa, Takeshi Kamoi, Hiroshi Kido
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Patent number: 9380667Abstract: An illumination device includes a main light source block having a plurality of main light sources and a plurality of current limiters, and an auxiliary light source block having an auxiliary light source and a constant-current unit. A series circuit of the auxiliary light source and the constant-current unit is electrically connected in parallel with the main light source block, between first and second output terminals of a rectifier. A smoothing capacitor is electrically connected in parallel with a specific main light source among the plurality of main light sources. The specific main light source and a corresponding current limiter are electrically connected in parallel with the series circuit of the auxiliary light source and the constant-current unit.Type: GrantFiled: June 18, 2015Date of Patent: June 28, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Shigeru Ido, Hiroshi Kido, Akinori Hiramatu, Takeshi Kamoi, Katsushi Seki, Daisuke Yamahara, Daisuke Ueda
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Patent number: 9374865Abstract: A lighting device includes a rectifier, a constant current regulator and a charge-discharge circuit. The constant current regulator is electrically connected in series with first and second solid-state light-emitting element arrays between a pair of output terminals of the rectifier. The constant current regulator is configured to adjust a current flowing through the second solid-state light-emitting element array to a constant current. The charge-discharge circuit is electrically connected in series with the first solid-state light-emitting element array between the pair of output terminals of the rectifier. The charge-discharge circuit includes a charge storage element, and is configured so that a charge current flows to the charge storage element through the first solid-state light-emitting element array, and so that a discharge current flows from the charge storage element to the second solid-state light-emitting element array.Type: GrantFiled: July 10, 2015Date of Patent: June 21, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Daisuke Yamahara, Takeshi Kamoi, Hiroshi Kido, Akinori Hiramatu, Katsushi Seki, Daisuke Ueda, Shigeru Ido
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Patent number: 9374864Abstract: A controller circuit is configured to adjust the number of light-emitting diodes that a current flows from a rectifier circuit through so that: the number of light-emitting diodes, which are lit, of the plurality of light-emitting diodes increases according to a value of a pulsating voltage during a time period that the value of the pulsating voltage increases; and the number of light-emitting diodes, which are lit, of the plurality of light-emitting diodes decreases according to the value of the pulsating voltage during a time period that the value of the pulsating voltage decreases. Light-emitting diodes, which start to emit light by a higher voltage value, of the plurality of light-emitting diodes are disposed at a position nearer to an outside of a mounting region of a substrate than light-emitting diodes, which start to emit light by a lower voltage value, of the plurality of light-emitting diodes.Type: GrantFiled: June 9, 2015Date of Patent: June 21, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takeshi Kamoi, Akinori Hiramatu, Hiroshi Kido, Katsushi Seki, Shigeru Ido, Daisuke Yamahara, Daisuke Ueda
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Publication number: 20160150609Abstract: A lighting device includes a rectifier circuit, a conversion circuit and a control circuit. A first inductor of a first series circuit and a second inductor of a second series circuit have inductances by which a time period, during which a diode is electrically conducted, is made shorter than a half period of a resonance period of a closed loop circuit. The closed loop circuit includes a first capacitor, the first inductor, a second capacitor and a third capacitor. The control circuit is configured to control a switching element in such a manner that the switching element is turned on at fixed periods.Type: ApplicationFiled: November 18, 2015Publication date: May 26, 2016Inventors: Keisuke SEKI, Takeshi KAMOI, Daisuke YAMAHARA, Hiroyuki ASANO, Masafumi YAMAMOTO, Masato HIMEDA, Katsuyuki DOI
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Publication number: 20160150611Abstract: A lighting device includes a rectifier circuit, a conversion circuit, a constant current circuit and a control circuit. The conversion circuit includes a first series circuit, a second series circuit and a third series circuit. The conversion circuit is configured to output a DC current by on/off of a switching element being controlled by the control circuit. A high potential-side terminal of the third capacitor is electrically connected to an output terminal. The low potential-side terminal of the third capacitor is electrically connected to an output terminal, via the constant current circuit.Type: ApplicationFiled: November 18, 2015Publication date: May 26, 2016Inventors: Masato HIMEDA, Hiroyuki ASANO, Masafumi YAMAMOTO, Takeshi KAMOI, Daisuke YAMAHARA, Keisuke SEKI, Katsuyuki DOI
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Publication number: 20160066375Abstract: Lighting apparatus which supplies a current to solid-state light-emitting device (LED) includes: DC power supply circuit (AC/DC converter); and DC/DC converter that converts an output voltage of DC power supply circuit and applies, to solid-state light-emitting device, the output voltage converted. DC/DC converter includes: switching element; and DC/DC control circuit that performs a control of repeatedly turning ON and OFF switching element in a boundary conduction mode, and DC power supply circuit adjusts the output voltage to make a switching frequency of switching element higher than a first frequency, based on a forward voltage to be applied to solid-state light-emitting device.Type: ApplicationFiled: August 12, 2015Publication date: March 3, 2016Inventors: Keisuke SEKI, Takeshi KAMOI, Daisuke YAMAHARA
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Publication number: 20160066388Abstract: Lighting apparatus includes: AC/DC converter which converts AC voltage Vac to DC voltage Vdc; DC/DC converter which converts DC voltage Vdc to a DC voltage to be applied to LED; and detection circuit which detects AC voltage Vac. DC/DC converter includes switching element, and control circuit that performs a control of repeatedly turning on and off switching element in a boundary conduction mode. Control circuit performs the control under which ON time Ton is kept from exceeding an upper limit that is previously determined, and raises the upper limit when AC voltage Vac detected by detection circuit falls below a predetermined value. ON time Ton is a period of time during which switching element is kept ON.Type: ApplicationFiled: August 10, 2015Publication date: March 3, 2016Inventors: Keisuke SEKI, Takeshi KAMOI, Daisuke YAMAHARA
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Publication number: 20160037594Abstract: A lighting device includes a rectifier, a constant current regulator and a charge-discharge circuit. The constant current regulator is electrically connected in series with first and second solid-state light-emitting element arrays between a pair of output terminals of the rectifier. The constant current regulator is configured to adjust a current flowing through the second solid-state light-emitting element array to a constant current. The charge-discharge circuit is electrically connected in series with the first solid-state light-emitting element array between the pair of output terminals of the rectifier. The charge-discharge circuit includes a charge storage element, and is configured so that a charge current flows to the charge storage element through the first solid-state light-emitting element array, and so that a discharge current flows from the charge storage element to the second solid-state light-emitting element array.Type: ApplicationFiled: July 10, 2015Publication date: February 4, 2016Inventors: Daisuke YAMAHARA, Takeshi KAMOI, Hiroshi KIDO, Akinori HIRAMATU, Katsushi SEKI, Daisuke UEDA, Shigeru IDO