LIGHT EMITTING DIODE DRIVE DEVICE, ILLUMINATION DEVICE, IN-VEHICLE CABIN ILLUMINATION DEVICE, AND VEHICLE ILLUMINATION DEVICE

LIGHT EMITTING DIODE DRIVE DEVICE, ILLUMINATION DEVICE, IN-VEHICLE CABIN ILLUMINATION DEVICE, AND VEHICLE ILLUMINATION DEVICE

A light emitting diode drive device includes a drive circuit section that applies a direct-current voltage to a light source including a plurality of light emitting diodes connected in series to allow the light source to light up, a voltage detection circuit section that detects a voltage across the...

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1. Verfasser: NAGASE, HARUO
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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creator NAGASE, HARUO
description A light emitting diode drive device includes a drive circuit section that applies a direct-current voltage to a light source including a plurality of light emitting diodes connected in series to allow the light source to light up, a voltage detection circuit section that detects a voltage across the light source, and a malfunction determination circuit section that determines that the light emitting diode is short-circuited when the voltage detection circuit section detects a voltage drop and a potential between the voltage before being dropped and the voltage after being dropped is equal to or more than a predetermined threshold value. Thus, it is possible to detect a fact that a light emitting diode, which lights up, is short-circuited or is not short-circuited, with a simple circuit configuration.
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subjects BASIC ELECTRIC ELEMENTS
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
title LIGHT EMITTING DIODE DRIVE DEVICE, ILLUMINATION DEVICE, IN-VEHICLE CABIN ILLUMINATION DEVICE, AND VEHICLE ILLUMINATION DEVICE
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