Long-distance LED lamp light modulation circuit through controllable rectification

Abstract

A long-distance LED lamp light modulation circuit through controllable rectification includes a rectification control unit and an LED lamp brightness adjusting unit. The rectification control unit includes a control power supply module, a controllable rectification module, a zero-crossing detection module, a single-chip microcomputer control module, a trigger control module and a brightness giving module. A single-phase 220V AC power supply is input, and a controllable rectification voltage with a brightness control signal is output. The LED lamp brightness adjusting unit includes an adjusting power supply module, a waveform sampling module, a single-chip microcomputer adjusting module and an LED driving module. The controllable rectification voltage with the brightness control signal is input to control the brightness of an LED lamp. The light modulation circuit does not need a remote controller, a control line needs not to be laid additionally, a single-phase power line is directly utilized to transmit the brightness control signal, and the brightness of the LED lamp can be controlled and adjusted in a remote manner.

Description

technical field [0001] The invention relates to a lighting lamp technology, in particular to a controllable rectification long-distance LED lamp dimming circuit. 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 the problems caused by voltag...

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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