Constant power control device and constant power control method for LED lamps

Abstract

The invention discloses a constant power control device and a constant power control method of an LED lamp. The input alternating current is rectified by a power supply module, and then the line voltage is output to the line voltage detection module, and the power supply voltage is output to the control module at the same time; the line voltage detection module is based on The line voltage outputs a detection voltage signal to the control module; the control module obtains a corresponding data code value according to the detection voltage signal sampling, and outputs a dimming signal to the controlled lamp according to the data code value to adjust the work of the controlled lamp The current keeps its power constant. The corresponding data coding value is obtained by detecting and sampling the line voltage, and the data coding value is used to calculate and output the dimming signal to the controlled lamp, so that when the input voltage is unstable, the controlled lamp can be adjusted in real time through software calculation control. Working current, while realizing the constant power of LED lamps, it will not form self-excitation in the circuit.

Description

technical field [0001] The invention relates to the field of intelligent control, in particular to a constant power control device and a constant power control method for LED lamps. Background technique [0002] In the existing application of LED lamps, some lamps use hardware to realize constant power control, and some lamps do not use constant power control; during the use of lamps without constant power control, when the AC voltage rises or falls, the power also changes with the Especially in some economically underdeveloped countries and regions, the instability of the AC voltage causes the power of the lamp to change with the change of the AC voltage. When the AC voltage rises and the power of the lamp increases, the excess heat cannot be dissipated. Cause damage to lamps or lead to reduced reliability of lamps and shortened service life. [0003] Lamps that use hardware to achieve constant power control are generally implemented by adding a resistor and capacitor to t...

AI Technical Summary

Problems solved by technology

[0002] In the existing application of LED lamps, some lamps use hardware to realize constant power control, and some lamps do not use constant power control; during the use of lamps without constant power control, when the AC voltage rises or falls, the power also changes with the Especially in some economically underdeveloped countries and regions, the instability of the AC voltage causes the power of the lamp to change with the change of the AC voltage. When the AC voltage rises and the power of the lamp increases, the excess heat cannot be dissipated. Cause damage to lamps or lead to reduced reliability of lamps and shortened service life, etc.

[0003] Lamps that use hardware to achieve constant power control are generally implemented by adding a resistor and capacitor to the power chip. After the AC voltage is processed by the resistor and capacitor, it is output to the power chip for sampling. The power chip adjusts the current of the lamp according to the sampled voltage to achieve constant power control. This method is easy to form self-excitation and high cost in linear LED applications

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