Lichtemitter-Treiberschaltung für Rauchdetektor

Details

Veröffentlichungs-Nr.

EP4325459

Aktenzeichen

EP23191786

Anmeldetag

16. August 2023

Veröffentlichung

21. Februar 2024

Rechtsraum

EP

IPC

G08B17/107G08B29/24G05F1/46

Abstract

A driver circuit (100) and a method of supplying a constant current to a light emitter (202) of a smoke detector (200) are disclosed. The driver circuit includes a transistor (102), and a controller (104). The collector terminal of the transistor (102) is connected to the light emitter (202) and a resistor (106) is connected to the emitter terminal. During the manufacturing stage, the controller (104) monitors and stores the values of first base voltage to be supplied to the base terminal to supply a constant current to the light emitter (202), and first resistor voltage across the resistor (106) when the first base voltage is supplied to the base terminal. Before each smoke detection process, the controller (104) processes the stored data and adjusts the base voltage to be supplied to the base terminal to enable the transistor (102) to supply the constant current to the light emitter (202), regardless of the temperature around the smoke detector (200).

Anmelder

Firma

Carrier Corporation

Land

🇺🇸 USA

Fachgebiete