Digital alternating current dimming control circuit

Abstract

Disclosed is a digital alternating current dimming control circuit. The digital alternating current dimming control circuit comprises a dimming setting device, a dimming wave form control unit and a power supply circuit switch unit, wherein the dimming setting device is used for producing a break-over angle control parameter value, the dimming wave form control unit is provided with a control parameter value input end, a synchronizing signal input end and a dimming wave form signal output end, and according to a synchronizing signal input by the synchronizing signal input end and the break-over angle control parameter value, the dimming wave form control unit produces a dimming wave form signal in each period of a predetermined alternating current frequency, the power supply circuit switch unit is electrically connected between an alternating current power supply, a load device and the dimming wave form signal output end of the dimming wave form control unit, and is provided with a break-over position and an open-circuit position. A dimming wave form signal of a first level or a second level of the dimming wave shaped signal controls whether the power supply circuit switch unit is in the break-over position or the open-circuit position so as to achieve dimming control purpose, wherein the first level or the second level are output by the dimming wave form control unit.

Description

technical field [0001] The invention relates to a dimming control circuit, in particular to a digital AC dimming control circuit. Background technique [0002] Today's light source technology is developing vigorously, and lighting system design faces the challenge of dimming technology in every new light source technology. The mature dimming technology can make the lighting brightness meet the needs of various environments, and can effectively achieve the purpose of energy saving. Generally, the traditional dimming control circuit uses the principle of phase truncation dimming, which must include an AC silicon-controlled thyristor fluid (replacing the variable resistor that is not resistant to high power), which can realize the function of phase control and select the trigger phase of the AC voltage. This part of the phase conduction can reduce power consumption. [0003] The so-called AC silicon-controlled thyristor (TRIAC) is a bidirectional three-pole AC switch, so it c...

AI Technical Summary

Problems solved by technology

[0007] AC silicon controlled thyristor is widely used in the dimming of traditional incandescent bulbs. However, incandescent bulbs have poor luminous efficiency and waste energy. They have been gradually replaced by energy-saving bulbs or LED bulbs. Although energy-saving bulbs have high luminous efficiency, they are not easy to adjust. LED light bulbs not only have the highest luminous efficiency, but also have the advantage of being able to use AC thyristors to adjust light

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