Constant current-compensating solar LED street lamp

Abstract

The invention discloses a constant current-compensating solar LED street lamp. The constant current-compensating solar LED street lamp comprises a photosensitive sensing circuit, a PWM switching circuit, a storage battery pack circuit and a compensating circuit, wherein the photosensitive sensing circuit is used for generating a switching signal of the LED street lamp according to the intensity of ambient light; the PWM switching circuit is used for performing constant-current driving control on the LED street lamp so as to meet a road illuminating requirement; the storage battery pack circuit is used for converting solar energy into electric energy needed by the LED street lamp during working; the compensating circuit is used for performing temperature and constant current compensation on the LED street lamp; switching between an alternating current power supply and the storage battery pack circuit is controlled by a control module in an interlocking manner; the control module is further used for controlling the PWM switching circuit and the compensating circuit in a cooperating manner so as to output constant current to the LED street lamp. The LED street lamp can make full use of the solar energy, can automatic turn on or off, has higher light-emitting efficiency, is more stable in illuminance, better in illuminating effect and longer in service life, and can bring considerable economic and practical values.

Description

technical field [0001] The invention relates to a street lamp, in particular to a constant current compensation solar LED street lamp. Background technique [0002] Existing solar LED street lights are usually controlled to start or close at regular intervals, or are manually controlled to turn on and off. In terms of current control of LED street lights, constant voltage drive is often simply used in road conditions that do not require high lighting light. The control method is simple, and for occasions with high requirements for lighting light, the PWM constant current control method is used to drive LED street lights to achieve stable output and improve lighting effects. [0003] However, the disadvantage of this method is that it cannot automatically turn on and off street lights according to changes in ambient light, resulting in waste of energy or failing to meet the requirements of normal road lighting. On the other hand, as we all know, the LED light-emitting diode ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical problems, the present invention discloses a constant current compensation solar LED street lamp, which effectively solves the problem of unstable illuminance of LED street lamps, and at the same time prevents LED street lamps from being burned due to overcurrent

[0005] Another purpose of the present invention is to solve the problem that LED street lamps cannot realize the function of intelligently turning on or off automatically according to the change of ambient light intensity.

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