Pulse width modulation (PMW) modulator circuit
A technique of modulating circuits and resistors, which is applied to the layout of electric lamp circuits, electric light sources, lighting devices, etc. It can solve the problems of reduced dimming accuracy, deviation of LED light string brightness, and different currents, and achieve the effect of improving dimming accuracy
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[0017] Based on the two problems of traditional PWM dimming mentioned in the background technology, the following considerations are made:
[0018] 1. In multi-channel applications, the duty cycle of the PWM signal can be dynamically adjusted according to the actual value of the LED current of each channel to realize that the brightness of each LED in any dimming cycle is equal and is the preset value: I LED ×DT, where, I LED It is the average current on the LED when the PWM signal is at an effective high level in the dimming period, T is the period of the digital pulse PWM signal, and D is its duty cycle. In addition, it is assumed here that the LED current is turned off quickly, and the influence of the PWM signal off time on the brightness is ignored.
[0019] 2. According to the real-time brightness of the LED, it can accurately and dynamically adjust the duty cycle of the PWM signal that the internal circuit actually participates in dimming, reduce or even completely eli...
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