Large-power LED street-lamp constant-voltage constant-current switch power supply adapter

Abstract

The invention discloses a large-power LED street-lamp constant-voltage constant-current switch power supply adapter. The adapter comprises a switch power supply input circuit, a rectification circuit, a chopper circuit, an oscillation circuit, a peak absorption circuit, an overvoltage circuit, an under-voltage adjusting circuit, a driving convention circuit, a transformer, a rectification filtering voltage stabilizing circuit, an interrupted step-down circuit, a constant-voltage adjusting circuit and a constant current circuit. Compared to the prior art, the adapter of the invention possesses the following advantages that the large-power LED street-lamp constant-voltage constant-current switch power supply adapter possesses a constant voltage function and a constant current function; when a LED lamp bead string is not damaged, the adapter provides power through the constant voltage and the constant current, at this time, conversion efficiency is highest and can reach above 95% and illumination is highest too; under the condition that a damage rate of the lamp bead is below 20%, normal work can be achieved through a constant current mode; under the condition that the damage rate of the lamp bead is above 20%, interrupted work can be achieved through the constant current mode and an emergency work mode is reached so that traffic safety of vehicles, pedestrians and the like can be guaranteed maximumly through illumination and simultaneously timeliness of rescuing is guaranteed too.

Description

technical field [0001] The invention relates to a switching power supply adapter, in particular to a high-power LED street lamp constant voltage and constant current switching power supply adapter. Background technique [0002] The use of LED light-emitting diodes as street lamps is the best substitute for traditional sodium lamps today, and it is also the most energy-saving and environmentally friendly lamps. Its advantages such as high illuminance, low power consumption, and long service life are obvious to all. The application of the adapter has become the most troublesome thing for people. If the voltage and current provided to it are unstable, especially the unstable current will cause damage to the LED lamp bead, or even the whole lamp is completely broken. Voltage supply to achieve the purpose of constant current power supply, as long as the LED lamp bead string is not broken and not conducting, this method is possible, but when the LED lamp bead string is damaged and...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-power LED street lamp constant-voltage constant-current switching power adapter to solve the constant current problem of the high-power LED street lamp constant-voltage constant-current switching power adapter and meet the requirements of different LDE street lamps. With demand

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