Fluorescent lamp dimming circuit and operating method thereof

Abstract

The invention discloses a fluorescent lamp dimming circuit and an operating method thereof. The dimming circuit comprises a main circuit, an auxiliary power supply module, a singlechip control module and a driving module. An input power supply Vac is connected with input of the auxiliary power supply module, output of the auxiliary power supply module is connected with power input ends of the singlechip control module and the driving module, the singlechip control module samples input voltage of the main circuit, voltage across both ends of a fluorescent lamp and voltage across both ends of a first capacitor, input of the driving module is connected with a driving signal end of the singlechip control module, and output of the driving module is connected with four switching tubes in the main circuit. The operating method is that a singlechip controls on-off of the four switching tubes according to requirements in adjusting the brightness of the fluorescent lamp so as to change the capacitance across both ends of the first capacitor, thereby changing the voltage across both ends of the fluorescent lamp. The fluorescent lamp dimming circuit and the operating method thereof are mainly used for adjusting the fluorescent lamp under the condition that the power is very low so as to enable the fluorescent lamp not to be completely turned off.

Description

technical field [0001] The invention relates to fluorescent lamp dimming technology, in particular to a dimming circuit and working method of fluorescent lamps, mercury lamps, sodium lamps and other fluorescent lamps. Background technique [0002] Lighting plays a vital role in reducing energy consumption and greenhouse gas emissions. New lighting equipment such as LED lights can be used to improve lighting efficiency. However, by effectively reducing power consumption (such as in some occasions through absence The fluorescent lamps are dimmed when people come, and the fluorescent lamps are turned on to reduce energy consumption when people come). Traditional fluorescent lamps are still very meaningful in terms of energy saving. [0003] Controlling fluorescent lamps like fluorescent, mercury and sodium lamps, which are much more efficient than light bulbs, presents some serious challenges. Lights such as fluorescent lamps, each time they are turned on, reduce their life by...

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Problems solved by technology

[0004] In view of the above background, in order to overcome the existing deficiencies, the present invention provides a fluorescent lamp dimming circuit and its working method, which not only solves the problem that the electronic rectifier frequently cuts off the fluorescent lamp and reduces the life of the fluorescent lamp, but also consumes a lot of energy itself. low, so as to achieve the purpose of energy saving

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