LIGHT EMITTING ELEMENT DRIVING SYSTEM

PURPOSE:To conduct a fixed current to a light emitting element and thus keep illuminance constant by compensating line loss by means of a transistor and a diode. CONSTITUTION:A resistor R2 and a transistor 6 are connected in series to the light emitting element (LED) 1, and a Zener diode 7 is connec...

Full description

Saved in:
Bibliographic Details
Main Author SUDOU AKIRA
Format Patent
LanguageEnglish
Published 03.07.1984
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
Online AccessGet full text

Cover

More Information
Summary:PURPOSE:To conduct a fixed current to a light emitting element and thus keep illuminance constant by compensating line loss by means of a transistor and a diode. CONSTITUTION:A resistor R2 and a transistor 6 are connected in series to the light emitting element (LED) 1, and a Zener diode 7 is connected in parallel to the transistor 6 and the LED 1. If the relation between the equivalent resistance RTR and the line resistance (r) is within the range of the relation RTR+r= constant, the current Id flowing through the LED 1 is given in terms of Id= (Vz-Vbe-VD), and can be therefore used without being affected by the line loss.
Bibliography:Application Number: JP19820224511