Constant-current step-down circuit for emergency evacuation marker lamp and implementation method thereof

Abstract

The invention discloses a constant-current step-down circuit for an emergency evacuation marker lamp, and mainly solves the problems that an LED circuit structure and a power adjusting mode in an existing emergency evacuation marker lamp are complex, the design cost of the whole lamp is high, and energy is wasted. The constant-current step-down circuit comprises an LED lamp set, a linear voltage stabilization module and a control module, wherein the input end of the LED lamp set is connected with input voltage, the linear voltage stabilization module is connected to the output end of the LED lamp set in series, the input end of the control module is connected to the output end of the linear voltage stabilization module in series, and a plurality of resistors used for achieving power adjustment of the LED lamp set are further arranged in the control module. By means of the design, the characteristics of the linear voltage stabilization module are reasonably utilized, constant-current driving and power adjusting of the LED lamp set are achieved at the same time in the simplest, flexible and effective mode, the circuit structure is simplified, energy consumption and the overall design and production cost are reduced, and the efficiency of the emergency evacuation marker lamp is greatly improved. Therefore, the constant-current step-down circuit is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of fire protection, in particular to a constant-current step-down circuit for emergency evacuation sign lights and a method for realizing the same. Background technique [0002] Emergency evacuation marker lights are essential equipment in the evacuation system and a powerful tool to guide people to escape when a fire occurs. In recent years, LED lights have been widely used in emergency evacuation sign lights due to their small size, low energy consumption, and long life. Most of them use LED driver chips plus some peripheral devices such as large capacitors and large inductors to drive LEDs, and single-chip microcomputer power supply chips to supply power to single-chip microcomputers, and then realize LED drive and control through single-chip microcomputer output control signals, such as figure 1 circuit shown. In addition, most of these emergency evacuation sign lamps are powered by PWM. The significan...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a constant current step-down circuit for emergency evacuation sign lights and its implementation method, which mainly solves the problem of complex LED circuit structure and power adjustment methods in existing emergency evacuation sign lights, and the design cost of the entire lamp is high and wasteful. energy problem

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