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Flyback ballast for fluorescent lamp

A ballast and flyback technology, applied in the field of ballasts for fluorescent lamps, can solve problems such as lower efficiency control

Inactive Publication Date: 2007-09-12
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the lamp voltage is generated across the lamp, which will cause the unavoidable glow discharge
Another disadvantage of the above circuit is the reduced control over the efficiency during normal operation

Method used

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  • Flyback ballast for fluorescent lamp
  • Flyback ballast for fluorescent lamp
  • Flyback ballast for fluorescent lamp

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Please refer to FIG. 2 , which is a schematic circuit diagram of a flyback ballast 100 for a fluorescent lamp 15 according to an embodiment of the present invention. The flyback ballast 100 includes a first winding N P , a second winding N S1 and a third winding N S2 A transformer 50 of. A switch 20 is coupled to the first winding N of the transformer 50 P to form a flyback converter. Rectifiers 61 and 62 are respectively coupled to the second winding N S1 and the third winding N S2 . The capacitor 85 is coupled to the rectifier 61 to form a first filter 70 . Capacitor 86 is coupled to rectifier 62 to form a second filter 90 . A switch 30 is coupled to the first filter 70 . A switch 35 is coupled to the second filter 90 . The first filter 70 is coupled to the second filter 90 via a first terminal pair 15 a of the fluorescent lamp 15 . The switch 30 is coupled to the switch 35 via a second terminal pair 15 b of the fluorescent lamp 15 . a switching signal S ...

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PUM

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Abstract

A flyback ballast for fluorescent lamps is provided. A transformer is utilized to control the power delivered to the lamp. A first switch is coupled to the first winding of the transformer. A first filter is coupled to a second filter through a first terminal pair of a lamp. The second switch is coupled to the third switch through a second terminal pair of the lamp. A switching signal is provided to the first switch to control the power of the transformer delivered to the filters. A second switching signal and a third switching signal are provided to the second switch and the third switch respectively to control the power delivered to the lamp. No glow discharge is occurred during the preheating interval.

Description

technical field [0001] The present invention relates to a ballast, and more particularly to a ballast for a fluorescent lamp. Background technique [0002] Fluorescent lamps are the most common light source on the market today. Significant energy savings can be achieved by improving the efficiency of fluorescent lamps and / or providing dimming control. Thus, improving the efficiency and saving power of fluorescent lamps has attracted much attention in recent developments. In addition, in order to reduce environmental pollution, it is also important to extend the service life of fluorescent lamps. Proper startup and operation of fluorescent lamps can prolong their life. Before ignition, the cathode filament of the lamp electrode should be preheated to the appropriate emission temperature (emission temperature). During normal operation, the cathode filament should be maintained at emission temperature. In addition, glow discharge should be prevented because glow discharge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/14H01F38/10
CPCH05B41/295
Inventor 林甲森杨大勇
Owner SYST GEN