Automatic control method of the output power of gas discharge lamp and electronic ballast

Abstract

A method for automatically controlling the output power of a gas discharge lamp includes: detecting the luminous decay variation of the gas discharge lamp, according to the detected luminous decay variation, matching a corresponding actual power value for the gas discharge lamp; and according to the matched actual power value, regulating the output power of the gas discharge lamp. Accordingly, the invention also discloses an electronic ballast, including: a luminous decay sampling module(8), for detecting the luminous decay variation of the gas discharge lamp; a single chip microcomputer (7), for matching a corresponding actual power value for the gas discharge lamp according to the luminous decay variation detected by the luminous decay sampling module; and a half-bridge inverter(6), for regulating the output power of the gas discharge lamp according to the actual power value matched by the single chip microcomputer microcomputer. The electronic ballast can prolong the service life of the gas discharge lamp, and save more energy compared with existing electronic ballasts by the invention.

Description

technical field [0001] The invention relates to the lighting field, in particular to a method for automatically controlling the output power of a gas discharge lamp and an electronic ballast. Background technique [0002] The gas discharge light source is the most widely used light source in the luminous radiation light source. It uses the principle of gas discharge luminescence, that is, the principle that the gas medium radiates visible light during the discharge process of the current through the gas medium. Gas-discharge lamps include the following types of lamps: mercury lamps, metal halide lamps, high-pressure sodium lamps, low-pressure sodium lamps, and, less commonly, short-arc xenon lamps. The light-emitting element of these gas discharge lamp types is a ceramic arc discharge tube placed in a high-temperature-resistant lamp tube, and has a luminous capacity of more than 3W / cm2 (19.4W / in.2). [0003] The electrodes at both ends of the arc tube of the gas discharge l...

AI Technical Summary

Problems solved by technology

At this time, the actual luminous flux supported by the gas discharge lamp has been greatly reduced after the aging of the gas discharge lamp. When it passes the input of the rated power, the aging of the gas discharge lamp will be accelerated. At the same time, the aging light source still consumes the same electric energy, resulting in waste.

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