Silicon controlled rectifier dimming constant current power supply, formed LED system, and control method

Abstract

The invention discloses a silicon controlled rectifier dimming constant current power supply which comprises a separate AC controller with a 485 communication interface and at least one silicon controlled rectifier power supply which is connected to an output end of the separate AC controller. The silicon controlled rectifier power supply comprises a fuse resistor R1, a varistor RV1 connected to the fuse resistor R1 in parallel, a rectifier bridge BD1 connected to two ends of the varistor RV1, a capacitor C3 connected to the output end of the rectifier bridge BD1, a capacitor C4 connected to the capacitor C3 in parallel, a first series branch connected to the capacitor C4 in parallel, a driving chip LYT7504D connected to two ends of the first series branch, and a transformer T1 connected to the driving chip LYT7504D. The separate AC controller is controlled to carry out MOS chopping on mains supply, then the power of an output power supply is adjusted according to the conduction angleof MOS chopping wave, thus the input power of an LED lamp is changed, the purposes of adjusting the brightness, color temperature and color of the LED lamp are achieved, and the problem that the flexible dimming of an LED lamp is difficult to achieve in the prior art can be effectively solved.

Description

technical field [0001] The invention relates to a constant current power supply, in particular to a silicon controlled rectifier dimming constant current power supply and its LED system and control method. Background technique [0002] With the rapid development of science and technology, LED products are constantly developing and replacing. People's initial requirement for LED products is to realize energy saving while realizing lighting. Now, with the increase and change of application scenarios of LED products, people's demand for LED products The requirements are no longer just for lighting and energy saving, but also for technical indicators such as brightness, color temperature, and color of LED products. However, after the existing LED lamps are installed in the same place, they usually can only display fixed brightness, color temperature and color, and can only be turned on and off as a whole. Long-term high brightness and high color temperature of LED lamps will al...

AI Technical Summary

Problems solved by technology

However, after the existing LED lamps are installed in the same place, they usually can only display fixed brightness, color temperature and color, and can only be turned on and off as a whole. Long-term high brightness and high color temperature of LED lamps will also cause damage to the life of the power supply and lamp beads, which is not conducive to the long-term stable use of LED products

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