Perfect intelligent control should have the functions of manual control, intelligent control, light control, time control and fault alarm. So how to adjust the light beam of LED floodlight, which is widely installed in outdoor lamps?
The first method is to adjust the driving current of the led to realize the dimming of the LED lamp, because the brightness of the LED chip and the driving current of the LED have a fixed proportion. The second dimming is often referred to as analog dimming mode or linear dimming. The advantages are: when the driving current increases or decreases linearly, the LED chip will be relatively reduced, and the control circuit has strong immunity to the effect of driving current overshoot.
The third way of dimming is to make the driving current square and the pulse width variable by a certain control. By adjusting the duration of the pulse width, the output power can also be changed, so as to achieve the purpose of energy saving. When the frequency conversion speed regulation is generally between 200Hz and 10kHz, people can't feel the process of light moving due to the reservation of human eye vision. The advantage of this method is that it can improve the heat dissipation of LED.
The above three methods of dimmer are classified according to the output control of driving current of LED. The control circuit can also be divided into analog control and PWM control. The control circuit is usually completed by the microcontroller.