Logic-protection-emitter-coupling-type three-filter-type multi-output LED protection system

Abstract

The invention discloses a multiplexed-output LED protection system based on a logic protection emitter-coupled type amplifying circuit. The multiplexed-output LED protection system based on the logic protection emitter-coupled type amplifying circuit is mainly composed of a grid drive circuit, a logic control circuit, a power amplifier P1, a power amplifier P2, a pulse comparator U1, a pulse comparator U2 and the like, wherein the power amplifier P1 and the power amplifier P2 are connected with the logic control circuit, and the pulse comparator U1 and the pulse comparator U2 are connected with the logic control circuit. The multiplexed-output LED protection system is characterized in that the logic protection emitter-coupled type amplifying circuit is connected between the positive electrode input end of a main error amplifier W1 and the positive electrode input end of a safety error amplifier W2 in series. The multiplexed-output LED protection system has the functions of short circuit protection, overvoltage protection and open circuit protection and is quite low in power consumption, and the power consumption is only one third that of a traditional protection circuit. Meanwhile, a multiplexed-output voltage-stabilized source is arranged, in this way, the electricity demand of a protection circuit can be guaranteed, external electromagnetic interface can be effectively avoided, and the flexibility and precision of control can be improved.

Description

technical field [0001] The invention relates to an LED protection circuit, in particular to a logic protection emitter coupling type triple filter type multi-output LED 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 life lighting. Since LED lamps are different from traditional incandescent lamps, they need to be driven by a dedicated drive circuit, so there are various protection systems on the market to prevent the drive system from being interfered by internal or external adverse factors. [0003] Although most of these protection systems have short-circuit protection functions and overheat protection functions, the structures of these protection systems are often relatively complicated, and their maintenance is relatively difficult. At the same time, the energy consumption of these pr...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of complex structure, high energy consumption and poor comprehensive protection in the current LED lamp protection system, and provide a logical protection emitter coupling type three-filter multi-output LED protection system

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