Patent
Lighting circuit and vehicle lamp having the same
Tomoyuki Ichikawa
- 16 Sep 2015
17
TL;DR: In this article, an overcurrent protection circuit is inserted between the drive circuit and the light source to restrict the lamp current flow so that the lamp's current does not exceed a threshold value.
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Abstract: A lighting circuit for a light source includes a drive circuit and an overcurrent protection circuit. The drive circuit supplies power to the light source. The overcurrent protection circuit is inserted between the drive circuit and the light source. The overcurrent protection circuit restricts a lamp current flowing into the light source so that the lamp current does not exceed an overcurrent threshold value. The overcurrent protection circuit includes a transistor, an inductor, a rectifier, a current sensor and an overcurrent protection controller. The current sensor generates a current detection signal according to the lamp current. The overcurrent protection controller controls ON/OFF of the transistor based on the current detection signal and the overcurrent threshold value. The transistor, the inductor and the rectifier are disposed in a T-shape.
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Citations
Patent
Power supply circuit for LED lighting
Qiming Wang,Guanghua Wu +1 more
- 15 Jun 2017
TL;DR: An angle adjustment mechanism for LED bar lighting includes a lamp body, two end covers arranged two ends of the lamp body along an axial direction thereof, two lamp frames respectively mounted on the two threading pipes, two wheel gears respectively fixed on the lamp frames, two outer end caps fixed and covered on the end covers, respectively, and at least two stopping plates respectively received in the two lamps as mentioned in this paper.
2
Patent
Detection of the partial and/or total failure of a group of light sources on a vehicle
Pena Miguel-Angel,Illan Antonio Domingo,Martinez-Perez Jose-Ramon,Lara Cabeza Juan,Santaella Juan-Jose,Martinez-Zaldivar Tomas +5 more
- 08 Nov 2017
TL;DR: An electric power supply device for a plurality of light sources on a motor vehicle is described in this article, where two binary signals for the identification of partial and total failure of a light source are transmitted.
Patent
Load driving device, and vehicular lighting fixture
Ichikawa Tomoyuki,Tsuda Toshiaki +1 more
- 15 Jan 2019
TL;DR: In this paper, a load driving device (100) receives input voltage from a power supply (202), and supplies electrical power to a load (200) under the control of a processor.
Patent
Lighting apparatus, lamp, vehicle, and non-transitory computer-readable medium
Kambara Takashi,Moriwaki Toshiya,Murakami Masanobu,Koizeki Masahiko +3 more
- 02 Apr 2020
TL;DR: In this article, a lighting apparatus, a lamp, a vehicle, and a non-transitory computer-readable medium is presented. The lighting apparatus (1) includes a step-up converter (31), at least one step-down converter (32), and a controller (4).
Patent
Illuminant for vehicle headlight with automatic beam mode selection
Grave Manuel
- 20 Jun 2019
TL;DR: In this article, an illuminant for a vehicle headlight consisting of a carrier and an electrical driver is described, which can detect ambient light other than the vehicle light, such detection of ambient light influencing electrical driver in controlling the LEDs.
References
Patent
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Anatoly Shteynberg,Harry Rodriguez +1 more
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TL;DR: In this article, the average LED current is measured by integrating LED pulse current at off time and hysteretically adjusting on time of the power switch, and the regulator is constructed as a hysteretic peak current mode controller for continuous mode of operation of a power converter.
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Patent
Lighting circuit for discharge lamp
Masayasu Yamashita,Atsushi Toda +1 more
- 08 Jun 1998
TL;DR: In this article, a lighting circuit comprises a lighting detector for detecting if the discharge lamp is lighted, an input-voltage monitor circuit for detecting the input voltage to the DC power supply section, and a stable power supply circuit and a switch section for supplying power to a discharge lamp or inhibiting the power supply in accordance with a signal from the lighting detector.
173
Patent
Lighting controller for lighting device for vehicle
Fuminori Shiotsu,Masayasu Ito +1 more
- 06 Nov 2006
TL;DR: A lighting controller for a lighting device for a vehicle includes a semiconductor light source, a power source for supplying electric power; and control circuitry for controlling a supply of a current to the semiconductor Light Source.
77
Patent
Light-emitting apparatus
Ito Susumu
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TL;DR: In this paper, a light-emitting apparatus consisting of a lightemitting element, and a package molded body, having a recess portion for placing the light emitting element on a bottom surface, wherein a light transmissive sealing resin for covering the light emitting element is filled in the recess portion to form a light emitting surface consisting of an interface between the sealing resin and air.
72
Patent
Light source control device
Takao Muramatsu,Masayasu Ito,Kazuki Saito +2 more
- 10 May 2013
TL;DR: In this article, a light source control device comprises a first bypass switch connected in parallel to one part of semiconductor light sources, and a second bypass switch connecting in series to the first and the second bypass switches.
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