LED silicon-controlled rectifier phase-controlled dimmer and stroboflash eliminating method and stroboflash eliminating circuit thereof

Abstract

The invention discloses an LED silicon-controlled rectifier phase-controlled dimmer and a stroboflash eliminating method and a stroboflash eliminating circuit thereof. The circuit comprises a rectifier module and a stroboflash control module. The stroboflash control module compares the phase adjustment values of two adjacent rectification periods, and extends the turn-off time of an LED lamp string in the rectification period with smaller phase adjustment value to make the turn-off time of the LED lamp string in the rectification period with smaller phase adjustment value consistent with the turn-off time of the LED lamp string in the rectification period with larger phase adjustment value. Thus, the conduction time of the LED lamp string is the same in adjacent rectification periods, and stroboflash is eliminated.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to an LED thyristor phase control dimmer and a method and circuit for eliminating flicker. Background technique [0002] In the prior art, the phase control dimmer realized by triac, because the forward trigger current of the triac is different from the reverse trigger current, the output phase of the phase control dimmer output forward adjustment is different from the reverse The phases of adjustment are inconsistent; after the rectifier bridge, the adjustment phases converted into odd and even cycles are inconsistent; finally reflected in the LED lamp is that the brightness of the odd cycle and the even cycle are inconsistent, that is, the LED will flicker, and the frequency is consistent with the line voltage. It is 50hz, visible strobe. [0003] Such as figure 1 As shown, the forward control phase is θ1, and the reverse control phase is θ2. Assuming θ1<θ2, the LED lighting time ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the phase control dimmer realized by triac, because the forward trigger current of the triac is different from the reverse trigger current, the output phase of the phase control dimmer output forward adjustment is different from the reverse The phases of adjustment are inconsistent; after the rectifier bridge, the adjustment phases converted into odd and even cycles are inconsistent; finally reflected in the LED lamp is that the brightness of the odd cycle and the even cycle are inconsistent, that is, the LED will flicker, and the frequency is consistent with the line voltage. It is 50hz, visible strobe

Images