Rapid preheating and starting circuit for fluorescent lamps

Abstract

Provided is a rapid preheating and starting circuit for fluorescent lamps. The defect that newly-published rapid preheating and starting requirements cannot be satisfied due to relatively small filament preheating current and long preheating and starting time in the prior art of same kind is solved. The rapid preheating and starting circuit is characterized in that the circuit is formed by connecting a glow discharge tube and a micro PTC in series. The glow discharge tube is used for blocking current flowing through the PTC after a lamp tube is ignited, enabling the preheating and starting circuit to have no power consumption when the lamp tube is at work and increasing filament preheating current flowing through a resonant capacitor to achieve an effect of full filament preheating. The micro PTC is capable of effectively shortening the preheating time to achieve the requirement of rapid preheating and starting due to very small thermal capacity, fast temperature rise and fast resistance change. The technical problem of enabling both requirements of full filament preheating and rapid starting to be met in existing energy-saving lamps and other fluorescent lamps is successfully solved, and an effect of effective product quality improvement is achieved.

Description

Technical field [0001] The invention relates to a fluorescent lamp preheating starting circuit, in particular to a fluorescent lamp rapid preheating starting circuit composed of a glow discharge tube and a miniature PTC. Background technique [0002] The fluorescent lamps involved in the present invention are hot cathode fluorescent lamps, including energy saving lamps (compact fluorescent lamps), straight tube fluorescent lamps and ring fluorescent lamps. During the ignition and discharge (or start-up) process of this hot cathode fluorescent lamp, its cathode (ie filament electrode) must have a high enough temperature to be able to emit a large number of electrons to have a long switch life. Therefore, whether the fluorescent lamp achieves sufficient filament preheating when starting has a great influence on the service life of the fluorescent lamp, and it is very important whether the electronic ballast of the fluorescent lamp has a good preheating and starting function. ...

AI Technical Summary

Problems solved by technology

However, the preheating current of this technology is often too small, which makes the filament preheating insufficient and the switch life cannot meet the requirements.

In addition, the PTC used in this technology has power consumption during work, which reduces the overall lighting effect and reliability; Can turn off the soft starter" to replace the above-mentioned PTC (refer to the patent "can turn off the soft starter", the patent number is CN99257116.2), although this kind of "smart PTC" or "can turn off the soft starter" can do There is no additional power consumption and the preheating current can be large enough, but this kind of device has a large heat capacity, and the preheating start time is too long, which is difficult to meet the above-mentioned requirements for fast preheating start; Hot start circuit (refer to the patent "preheat start circuit", the patent number is CN200820160786.3), for most small diameter energy-saving lamps, this technology also has the disadvantages of small preheating current and long preheating time Question; 4. Use the method of increasing the operating frequency at startup

However, the cost of this circuit increases too much, which greatly limits the scope of application.

In short, the existing energy-saving lamp preheating start-up technology is still difficult to meet the new requirements

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