An adjustable power supply cabinet lamp

Abstract

The invention discloses an adjustable power supply counter lamp, which comprises a shell, and the inside of the shell is provided with a light bar and an adjustable power supply, the light bar is set by a constant current light bar, and the adjustable power supply The adjustable power supply includes a rectifier circuit, a drive circuit and a main control circuit. The drive circuit is composed of a pulse width modulation circuit and a rectifier filter circuit. It consists of a power supply circuit and an output power regulation circuit. The present invention replaces the constant voltage source with the constant current source and the adjustable constant current power source instead of the constant voltage power source. Effectively, under the same power, the heat generated by the constant current source is 1 / 9 of the constant voltage source, effectively solving the problem of low conversion efficiency and counter lamps. Overheating problem, and according to different lengths of counter lamps, adjust the constant current source power supply current to achieve consistent power per unit length of counter lamps, effectively solving the problem of inconsistent brightness of constant current source counter lamps.

Description

technical field [0001] The invention relates to the technical field of counter lamps, in particular to an adjustable power supply counter lamp. Background technique [0002] The LED counter lamp uses LED as the light source, and the lamps installed in the cabinet of the jewelry showcase are called LED counter lamps. Its installation and irradiation effects are different, and can be divided into LED counter light strips and LED counter pole spotlights. The light of the LED counter lamp is very penetrating and has a strong sense of three-dimensionality. It can project close-range point light sources on jewelry, improve the grade of jewelry, and greatly display the value of jewelry. [0003] Most of the existing counter lamps use constant voltage light strips and power supplies together. The constant voltage power supply voltage is consistent and will not change, generally 12V. The counter light strips have a current-limiting resistor. According to different cutting lengths, t...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides an adjustable power supply counter lamp, which replaces the constant voltage source with a constant current source and an adjustable constant current power supply instead of the constant voltage power supply, effectively solving the problem of low conversion efficiency and heating of the counter lamp. And solve the problem of inconsistency in the brightness of the constant current source counter lamp, to solve the problems raised in the above background technology

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