LED Inverter Burst Control for Imperceptible Low-Level Dimming

The patent applies periodic action by using pulse-width modulation (PWM) to switch the LED light source on and off at a high frequency. The duty cycle of these pulses is adjusted to control the average light output. By operating the LED in burst modes with periodic on/off cycles, the system achieves fine dimming control at low intensity levels while maintaining perceptual smoothness, as the human eye cannot detect the rapid switching at these frequencies.

The patent applies dynamics by implementing multiple operating modes (normal mode and burst modes with different sub-modes) that dynamically adjust the PWM switching behavior. At low intensity levels, the system transitions to burst modes where the LED is switched on for brief active state periods followed by longer inactive state periods. This dynamic adaptation of switching patterns ensures smooth perceptual transitions across the entire dimming range without visible flicker or fluctuations.

The patent applies periodic action by using high-frequency PWM switching to control LED current rather than directly reducing the DC current magnitude. The LED is switched on and off periodically with adjusted duty cycles, which maintains precise current control during the active periods while achieving fine-grained intensity control at low levels through the periodic nature of the switching. This approach provides superior intensity control precision compared to constant current reduction methods.