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公开(公告)号：US10485069B2
公开(公告)日：2019-11-19
申请号：US15984389
申请日：2018-05-20
Inventor： Keisuke Seki , Shigeru Ido , Kazuhiko Hayashi
Abstract: An illuminating apparatus includes a first light emitter, a second light emitter which emits light including more predefined color components than light emitted by the first light emitter, and a lighting device which supplies current modulated according to a visible light communication signal, to the first light emitter. The lighting device supplies a constant current to the second light emitter, while the first light emitter is supplied with current.
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公开(公告)号：US09706615B2
公开(公告)日：2017-07-11
申请号：US15134759
申请日：2016-04-21
Inventor： Keisuke Seki , Takeshi Kamoi , Daisuke Yamahara , Shun Kusuda
CPC classification number: H05B33/0815 , H02M1/32 , H02M1/4208 , H02M3/156 , H02M2001/0009 , H02M2003/1557 , H05B33/0851 , Y02B70/126
Abstract: 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.
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Patent Agency Ranking
公开(公告)号：US09456477B2
公开(公告)日：2016-09-27
申请号：US14944272
申请日：2015-11-18
Inventor： Keisuke Seki , Takeshi Kamoi , Daisuke Yamahara , Hiroyuki Asano , Masafumi Yamamoto , Masato Himeda , Katsuyuki Doi
CPC classification number: H05B33/0815 , H05B33/0812 , H05B33/0842 , Y02B20/343 , Y02B20/346
Abstract: 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.
Abstract translation: 照明装置包括整流电路，转换电路和控制电路。 第一串联电路的第一电感器和第二串联电路的第二电感器具有电感，通过该电感使二极管导通的时间周期短于闭环回路的谐振周期的半周期。 闭环电路包括第一电容器，第一电感器，第二电容器和第三电容器。 控制电路被配置为以这样的方式控制开关元件，使得开关元件以固定的周期接通。
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公开(公告)号：US10070493B2
公开(公告)日：2018-09-04
申请号：US15869439
申请日：2018-01-12
Inventor： Keisuke Seki
CPC classification number: H05B33/0845 , F21S8/02 , F21S8/038 , F21V23/008 , F21Y2115/10 , G09F13/005 , G09F13/04 , H04B10/116 , H05B33/0815
Abstract: A lighting device which supplies a light-emitting element with a current modulated based on a visible light communication signal includes: a DC power supply circuit which supplies the light-emitting element with a first voltage that is a DC voltage; and a current control circuit which (i) includes a current control element connected in series to the light-emitting element, (ii) switches the current control element between a first state and a second state based on the visible light communication signal, the first state and the second state differing in electrical impedance, and (iii) adjusts, to a constant current value corresponding to a constant current instruction signal, a current flowing through the light-emitting element in a period in which the current control element is in the first state, by controlling the current control element.
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公开(公告)号：US10038502B1
公开(公告)日：2018-07-31
申请号：US15877582
申请日：2018-01-23
Inventor： Keisuke Seki
Abstract: A lighting device includes: a DC power supply circuit which supplies a light-emitting element with a first voltage; a signal generation circuit which generates a control signal based on a visible light communication signal; a current control element which is connected in series to the light-emitting element and turned on and off based on the control signal; a DC power supply control circuit which causes a second voltage at a first node between the light-emitting element and the current control element to be a constant value, by controlling the DC power supply circuit based on the second voltage; and a first feedback circuit which supplies the DC power supply control circuit with the second voltage. The first feedback circuit supplies the DC power supply control circuit with a predetermined voltage in a period in which the current control element is off.
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公开(公告)号：US09723665B2
公开(公告)日：2017-08-01
申请号：US14822054
申请日：2015-08-10
Inventor： Keisuke Seki , Takeshi Kamoi , Daisuke Yamahara
CPC classification number: H05B33/0815 , H02M3/33546 , H05B37/0227 , Y02B20/346
Abstract: 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.
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公开(公告)号：US20160205741A1
公开(公告)日：2016-07-14
申请号：US14988182
申请日：2016-01-05
Inventor： Keisuke Seki , Akinori Hiramatsu , Hiroshi Kido
IPC: H05B33/08
CPC classification number: H05B33/0866 , H05B33/0827 , H05B33/086
Abstract: An illumination system includes: a first light-emitting element column including one of a single first light-emitting element or a plurality of first light-emitting elements connected in series; a second light-emitting element column connected in parallel with the first light-emitting element column, and including one of a single second light-emitting element or a plurality of second light-emitting elements connected in series; a constant current supply that supplies a constant current to the first light-emitting element column and the second light-emitting element column which are connected in parallel; a resistor that is connected in series with the first light-emitting element column, and detects a magnitude of current flowing through the first light-emitting element column; and a current adjuster circuit that adjusts the magnitude of the current flowing through the first light-emitting element column, according to the magnitude of the current detected by the resistor.
Abstract translation: 照明系统包括：第一发光元件列，包括串联连接的单个第一发光元件或多个第一发光元件中的一个; 与第一发光元件列并联连接的第二发光元件列，并且包括串联连接的单个第二发光元件或多个第二发光元件中的一个; 向第一发光元件列和第二发光元件列并联连接的恒流源， 与第一发光元件列串联连接的电阻，并检测流过第一发光元件列的电流的大小; 以及电流调节器电路，其根据由电阻器检测的电流的大小来调节流过第一发光元件列的电流的大小。
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