LED thyristor phase control dimmer and method and circuit for eliminating stroboscopic

Abstract

The invention discloses an LED thyristor phase control dimmer, a method for eliminating flicker and a circuit thereof, wherein the circuit includes a rectification module and a flicker eliminating control module. The anti-flicker control module compares the magnitude of the phase adjustment value of two adjacent rectification cycles, and by prolonging the off time of the LED light string in the rectification cycle with a small phase adjustment value, the LED light string in the rectification cycle with a small phase adjustment value The turn-off time in is consistent with the turn-off time in the rectification cycle with a large phase adjustment value; thus, the turn-on time of the LED light strings in adjacent rectification cycles is the same, eliminating stroboscopic flicker.

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 ...

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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

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