Digital addressable lighting interface (DALI) dimming control circuit

Abstract

A digital addressable lighting interface (DALI) dimming control circuit is used for electrically connecting an LED driving circuit. The LED driving circuit comprises a series LED source, a switch andan LED lamp, wherein the LED source comprises a current feedback circuit and a voltage feedback circuit, the DALI dimming control circuit comprises a microcontroller, a current detection circuit, a voltage detection circuit and a DALI communication circuit, the microcontroller is electrically connected with the current detection circuit, the voltage detection circuit and the DALI communication circuit, the current detection circuit and the voltage detection circuit are used for electrically connecting an output end of the LED source, the DALI communication circuit is used for electrically connecting DALI external equipment, the microcontroller is used for electrically connecting the current feedback circuit, the voltage feedback circuit and the switch, and the microcontroller is used for judging whether LED failure occurs or not according to an output current of the LED source and controlling the LED source to reduce a voltage output if a DALI shutdown signal is received.

Description

technical field [0001] The invention relates to the technical field of LED driving, in particular to a DALI dimming control circuit. Background technique [0002] DALI (Digital Addressable Lighting Interface, Digital Addressable Lighting Interface) dimming is an emerging technology with rich functions that can meet the digital control of LED lights. It occupies an important position in the future intelligent home and has a good market Prospects. [0003] At present, there are many DALI dimming products on the market. For example, the Chinese patent with the publication number CN 203104871U proposes an intelligently controlled DALI dimming control device, including a DALI signal input module and a DALI dimming control module connected thereto. An input signal overvoltage protection module is connected between the control modules, and the input signal overvoltage protection module includes an input signal voltage detection unit for detecting the signal input voltage of the D...

AI Technical Summary

Problems solved by technology

[0004] However, the above intelligent control DALI dimming control device can only simply perform overvoltage protection, cannot judge lamp failure, and cannot control standby power consumption. There is also persistent afterglow, and the electrical performance is poor.

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