Switching power supply and current constant current linear change method, LED lamp control circuit

Abstract

A switching power supply, a constant current linear change method, and a control circuit for an LED lamp. Among them, the switching power supply includes: power supply, current limiting module and pulse control module. The pulse signal output terminal of the module is coupled, and the load signal input terminal of the current limiting module is coupled with an external load. The pulse control module is used to generate a pulse signal and input the pulse signal into the current limiting module. The current limiting module is used to control the off-time interval of the load signal input terminal of the current limiting module according to the pulse signal, so that the current input to the external load changes linearly with a constant current. By controlling the current input to the external load to change linearly with a constant current, the stability of the current input to the lamp is improved, thereby effectively improving the stability of the brightness of the lamp made of LED as a light-emitting material in low light.

Description

technical field [0001] The invention relates to the field of electrical technology, in particular to a switching power supply, a constant current linear change method, and a control circuit for an LED lamp. Background technique [0002] With the development and improvement of science and technology, lamps made of light-emitting diodes (Light Emitting Diode, LED) as light-emitting materials have been widely used. Most of the light-emitting tubes of lamps are composed of several LEDs connected in series or in parallel. In the lamp, the brightness of the lamp can be controlled by controlling the magnitude of the current passed into the light-emitting tube. However, in the current prior art, the control circuit in the lamp cannot well control the current passing into the luminescent tube. It cannot be well adapted to the required adaptation of the light-emitting tube in low light, resulting in the instability of the light emission of the lamp in low light, and also the unstabl...

AI Technical Summary

Problems solved by technology

However, in the current prior art, the control circuit in the lamp cannot well control the current passing into the luminescent tube. It cannot be well adapted to the low light conditions of the light-emitting tubes, resulting in the instability of the light emission of the lamps in low light conditions, and also the unstable brightness in low light conditions.

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