A control method of non-flash starting of high tension gas-discharge lamp

Abstract

The invention provides a control method used for the no-flash starting of a high-intensity gas discharge lamp. Before the ignition starting is carried out on the high-intensity gas discharge lamp, the current of the lamp is first controlled to be constant and the value of the current is led to be higher than the rated current. The voltage of the lamp is subsequently judged; when the stable voltage in the pre-heating stage of the lamp is reached, the current of the lamp is continuously reduced, thus gradually increasing the voltage and power of the high-intensity gas discharge lamp; when the current of the lamp is reduced to the rated current of the high-intensity gas discharge lamp, the current of the lamp is controlled to be reduced or increased continuously; meanwhile, the voltage of the lamp is sampled continuously; when the voltage of the high-intensity gas discharge lamp is sampled to approach or reach the rated voltage of the lamp, the lamp enters to normal work with constant power. The invention controls the whole starting process of the lamp by controlling the current of the lamp and gives out corresponding control signals in different stages, thus leading to no flash of the high-intensity gas discharge lamp, smooth change of colour temperature, extended colour change and natural power transition; furthermore, the service life of the high-intensity gas discharge lamp is increased.

Description

technical field [0001] The invention relates to a start-up control method of an electronic ballast for high-intensity gas discharge lamps, in particular to a start-up control method for electronic ballasts of high-intensity gas discharge lamps such as high-pressure sodium lamps and metal halide lamps. Background technique [0002] Unlike fluorescent lamps, high-intensity discharge lamps have very high requirements for starting. During the starting process of the lamp, it can be said that the state of each stage varies greatly, which often leads to unstable circuit operation. After the lamp is broken down, especially when entering constant power control, the lamp will immediately flicker or even go out, which has a great impact on the life of the lamp. Therefore, in order to make the lamp operate normally, the performance should be improved as much as possible, and the life extension will directly depend on the resolution of these difficulties. The starting process of the la...

AI Technical Summary

Problems solved by technology

[0002] Unlike fluorescent lamps, high-intensity discharge lamps have high requirements for starting. During the starting process of the lamp, it can be said that the state of each stage is very different, which often leads to unstable circuit operation.