Logic protection emitter coupling-type three-filtering amplification large-size LED lamp protection system

Abstract

The invention discloses an LED lamp protection system based on a logic protection emitter-coupled amplifying circuit, mainly composed of a transformer T, a driving chip M, a switching current source connected in series between a VCC pin and an INP pin of the driving chip M, a capacitor C3 connected in series between a BOOST pin and a TG pin of the driving chip M, a resistor R7 connected in series between the TG pin and a TS pin of the driving chip M, and a transistor Q4 of which the base is connected with the TG pin of the driving chip M, the collector is grounded sequentially through a capacitor C4 and a capacitor C5, and the emitter is grounded. The LED lamp protection system is characterized in that a logic protection emitter-coupled amplifying circuit is connected in series between the VCC pin and the BOOST pin of the driving chip M. The LED lamp protection system of the invention not only has the functions of short-circuit protection, over-voltage protection and open-circuit protection, but also has very low power consumption. Moreover, the starting time is only 1 / 4 of that of a traditional gate driving circuit.

Description

technical field [0001] The invention relates to an LED drive circuit, in particular to a logic protection emitter coupling type triple filter amplification LED lamp protection system. Background technique [0002] At present, due to the characteristics of low energy consumption, long service life, safety and environmental protection, LED lamps have become one of the mainstream products for people's living lighting. Since the LED lamp is different from the traditional incandescent lamp, it needs to be driven by a dedicated driving circuit. However, due to the unreasonable design structure of the currently widely used gate drive circuit, the current gate drive circuit has defects such as high energy consumption, large current noise, and long start-up time. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of high energy consumption, large current noise and long start-up time in the current gate drive circuit, and provide a re...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of high energy consumption, large current noise and long start-up time in the current gate drive circuit, and provide a reasonable structure design, which can effectively reduce power consumption and current noise, and significantly shorten the start-up time Logic Protection Emitter Coupled Triple Filter Amplified LED Lamp Protection System

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