The first method is to realize the dimming of the LED l […]
The first method is to realize the dimming of the LED lamp by adjusting the driving current of the LED, because the brightness of the LED chip and the driving current of the LED have a fixed ratio.
The second dimming is often referred to as analog dimming mode or linear dimming. The advantage of this dimming is that 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 overshoot of the driving current. The disadvantage is that the change in the driving current will have a certain impact on the color temperature of the LED chip.
A third way of dimming is the Pulse Light Modulator (PWM) mode. This method is to make the driving current square through a certain control, variable pulse width, and change the duration through the adjustment of the pulse width, which can also change the output power at the same time, so as to achieve the purpose of energy saving. The frequency conversion speed regulation is generally between 200Hz and 10kHz. Due to the preservation of human vision, people cannot feel the process of light flickering moving. The advantage of this approach is that moving the light has the advantage of improving the heat dissipation of the LED. The disadvantage is that the overshoot of the driving current has a certain effect on the life of the LED chip.
The above three dimmer methods are classified according to the output control of the drive current of the LED. The control circuit can also be divided into analog control and PWM control, the control circuit is usually completed by a microcontroller.