Method and device for controlling effuser connected to cutting phase dimmer

Abstract

The present invention relates to a method and apparatus for controlling bleeder connected to phase-cut dimmer, wherein the method includes: determining a first time period when the input voltage is lower than a predetermined reference voltage using at least one preceding input voltage cycle; opening bleeder in the first time period in a subsequent input voltage cycle; closing bleeder in a second time period, wherein the second time period equals to the input voltage cycle minus updated first time period, wherein the updated first time period equals to a sum of the first time period and a predetermined advancing time period; and repeating the steps of opening and closing the bleeder using the updated first time period. The present invention is capable of controlling bleeder connected to phase-cut bleeder without distinguishing the dimming types from Triac to Trail, thereby simplifying process and reducing calculation.

Description

technical field [0001] The present application relates to the lighting field, and in particular to a method for controlling a bleeder connected to a phase-cut dimmer and a device for controlling the bleeder connected to the phase-cut dimmer. Background technique [0002] With the development of lighting technology, the application of dimmer is more and more extensive. figure 1 A block diagram of a typical dimming system is shown. Such as figure 1 As shown, the typical dimmer system includes a lighting device, a driver and a dimmer. Wherein, the driver is provided with a dimming control circuit. A dimmer cuts off the phase of the input voltage. The ideal waveform and the correct waveform detected as image 3 shown. The dimming control circuit such as a microcontroller (microcontroller, referred to as MCU) may have a comparator, and the comparator compares the phase detection signal and the fixed voltage V ref Make comparisons and generate comparison results. For examp...

AI Technical Summary

Problems solved by technology

Therefore, the sampling interval will be longer than the code runs, which will limit the sampling accuracy

The bleeder may open slightly later, resulting in a longer detected phase, affecting dimming accuracy

[0006] It can be seen that in the above-mentioned technologies, there are technical problems of complex processing, large amount of calculation and low precision.

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