Single-live-wire low-harmonic-wave adjustment method for controlling brightness of LED lamp

Abstract

A single-live-wire low-harmonic-wave adjustment method for controlling brightness of an LED lamp is realized by a device which is composed of a wall controlling switch unit and an LED lamp adjustment driving unit. When brightness changes, the wall controlling switch unit transmits a brightness control signal which is controlled by phase shift triggering and is composed of a guiding waveform and a data waveform to the LED lamp adjustment driving unit. The LED lamp adjustment driving unit changes the brightness of the LED lamp according to two-bit ternary brightness data in the brightness control signal. When the LED lamp is lightened and the brightness control signal is not transmitted, the voltage waveform on the single live wire is a continuous and complete single-phase sinusoidal wave. The LED lamp brightness trimming method does not require a remote controller. Furthermore singly laying of a control line or re-laying of a power line is not required. The single-live-wire low-harmonic-wave adjustment method has a low harmonic wave characteristic and furthermore can realize replacement and upgrading of a common illuminating lamp.

Description

technical field [0001] The invention relates to a lighting lamp technology, in particular to a single live wire low harmonic adjustment method for controlling the brightness of an LED lamp. Background technique [0002] Due to the nonlinear characteristics of LED lamps, the brightness of LED lamps cannot be realized by adjusting the voltage. [0003] When using a controllable constant current source to adjust the brightness of the LED lamp, the change of the working current will cause the color shift of the LED lamp. At the same time, the load current of the LED lamp becomes very low under low brightness, which will make the controllable constant current source The lower the efficiency and the higher the temperature rise, the greater the power consumption on the driver chip will be, which will damage the life of the constant current source and the LED light source. [0004] Using PWM (pulse width modulation) dimming method to control the brightness of LED lights can avoid t...

AI Technical Summary

Problems solved by technology

The LED light control circuit is equipped with a remote control receiving device, and the LED light can be dimmed step by step or steplessly dimmable through the remote control. The disadvantage is that one LED light needs to be equipped with a remote control, resulting in a large number of remote controls and troublesome management. , the cost is also high

However, this method can only provide 4 levels of adjustable brightness of LED lights, and the switch action has a time requirement

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