A light source abnormal alarm circuit for led lamps

Abstract

The invention discloses a light source abnormal alarm circuit of an LED lamp, which is connected to a driving power supply of the LED lamp. The light source abnormal alarm circuit cuts off the light source circuit and outputs an indicator light signal when the light source is short-circuited or has a low conduction voltage drop. and buzzer alarm signal; when the light source current is lower than the preset value, output indicator light signal and buzzer alarm signal. The circuit of the invention is directly connected to the output end of the LED drive power supply, and outputs different processing results for different faults of the light source, thus having wide coverage and relatively perfect alarm function.

Description

technical field

[0001] The invention belongs to the field of electronic circuit design, and in particular relates to an abnormal light source alarm circuit of an LED lamp. Background technique

[0002] With the popularization of LED lamps, constant current LED drive power supply with various protection functions such as overvoltage and short circuit protection has become an indispensable part of lamps. In the emergency centralized power supply lamps, the national fire protection standard GB17945-2010 requires that the lamps need to generate sound and light alarm signals when the main light source is abnormal, that is, light signals and sound signals need to be generated at the same time to remind people to replace the lamp or light source. Therefore, the lamp needs to add a light source alarm module, but the general alarm module needs to adopt the technical solution of additional power supply. A few directly adopt the LED constant current power supply output power supply sc...

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