CN2143859Y

CN2143859Y - Fluorescent lamp without filament

Info

Publication number: CN2143859Y
Application number: CN 92237670
Authority: CN
Inventors: 江林朝
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-04
Filing date: 1992-11-04
Publication date: 1993-10-13
Anticipated expiration: 2002-11-04

Abstract

The utility model discloses a novel fluorescent lamp which adopts a fluorescent lamp tube without a filament and a simple startup circuit. On one hand, the startup circuit can cause static high voltage to be generated between the two poles of one end of the lamp tube and can bring on glow discharge so as to cause mercury vapour between the two poles inside the lamp tube to be ionized and to generate high kinetic energy electrons with higher concentration; on the other hand, the startup circuit also causes voltage difference to be formed between the two ends of the lamp tube; the electrons with high kinetic energy inside the lamp tube further motivate the ionization of the mercury vapour inside the lamp tube under the function of the voltage difference so as to cause the fluorescent lamp tube to start up luminance. A ballast provides stable rated operating current for the lamp tube. After the lamp tube is lightened, and the fluorescent lamp works normally, the startup circuit lose functions. The utility model has the advantages of simple circuit, low cost, fast luminance startup and long service life.

Description

Fluorescent lamp without filament

The utility model belongs to lighting field, relates to a kind of fluorescent lamp.

Fluorescent lamp is big because of brightness, light efficiency is high is widely used.Existing fluorescent lamp adopts filament pre-heating, hot cathode to excite the startup form of build-up of luminance fluorescent tube mostly.The life-span of this hot cathode fluorescent lamp is being subjected to the filament pre-heating Temperature Influence on the one hand, this is because when negative electrode is not heated to due temperature, negative electrode does not have abundant thermionic emission, the starter contact is in case disconnect, ballast produces very high high voltage pulse and is added between the two poles of the earth of fluorescent tube, not only be difficult for start-up point fluorescent lamp pipe, and be easy to make the oxide on the negative electrode to splash, cause the lamp tube end blackout, can not be activated as fluorescent tube and to light, the contact of starter is closed again, and then said process repeats again, the contact of starter repeatedly disconnects, closure shortens the cathode life of lamp; On the other hand, be exactly when lamp works, there be " focus " on the filament, very high in focus place temperature and current density, oxide splashes particularly seriously herein, and therefore filament diameter also becomes more and more thin, causes filament to break at the focus place at last.Therefore, the fluorescent lamp that has filament adopts filament pre-heating, hot cathode to excite the startup form of build-up of luminance fluorescent tube having a strong impact on the useful life of fluorescent lamp.

The purpose of this utility model provides the novel fluorescent lamp that a kind of circuit is simple, starter is fast, the life-span is long.

The technical solution of the utility model is to realize like this, fluorescent tube is the fluorescent tube of no filament, utilize start-up circuit to make two interpolars of fluorescent tube one end produce quiet high pressure on the one hand, make again on the other hand between the two ends of fluorescent tube and also produce voltage, the quiet high pressure of two interpolars at first makes the mercuryvapour ionization of interpolar in the pipe and produces electronics electric arc, the electronics of kinetic energy is under the effect of voltage between lamp tube ends in the electronics high arc temperature district, further excites the mercuryvapour ionization between lamp tube ends and makes the fluorescent lamp build-up of luminance.

The utility model has the advantages that: owing to adopt the Fluorescent lamp without filament fluorescent tube, thereby overcome the shortcoming that influences fluorescent lifetime because of filament breaking; Thereby the life-span is long, also can use as usual the fluorescent tube of fracture of wire; Again owing to adopt the startup form of electronics electric arc build-up of luminance, thereby fast starting, reliable operation.

Below in conjunction with accompanying drawing the utility model and embodiment are described in further detail.

Fig. 1 is an electrical schematic diagram of the present utility model

Fig. 2 is the electrical schematic diagram of the utility model embodiment 1

Fig. 3 is the electrical schematic diagram of the utility model embodiment 2

Fig. 4 is the electrical schematic diagram of the utility model embodiment 3

As can be seen from Figure 1,1 pin of fluorescent tube joins the O of start-up circuit through ballast ZL, K switch and power supply one end ₂End is connected on 1 pin of fluorescent tube the O of start-up circuit by the ballast ZL of switch back ₁Terminate on 2 pin of fluorescent tube the I of the start-up circuit end and the other end that is connected on power supply after fluorescent tube 3 pin link to each other.The moment that K switch is closed, 1 pin of fluorescent tube is in off-state, no current flows through among the ballast ZL, and be connected on start-up circuit between both ends of power under the effect of supply voltage, the quiet high pressure of generation between 1 pin that makes on the one hand fluorescent tube and 2 pin, produce voltage difference in lamp tube ends again on the other hand, quiet high pressure between 1 pin and 2 pin at first makes fluorescent tube interior 1, mercuryvapour ionization and produce electronics electric arc between 2 pin, has the higher kinetic energy electronics of concentration in the high-temperature region of electronics electric arc, further excite the mercuryvapour ionization in the pipe under the effect of these kinetic energy electronics voltage difference between lamp tube ends, make the fluorescent tube build-up of luminance, ballast provides stable rated operational current for fluorescent tube, lamp tube starting, after the fluorescent lamp operate as normal, start-up circuit loses function.

As can be seen from Figure 2, start-up circuit is made of capacitor C, diode D and resistance R, drawing between capacitor C and diode D on 2 pin that a lead is connected on fluorescent tube, after K switch is closed, supply voltage carries out the half cycle voltage charging by resistance R and diode D to capacitor C, and capacitor C produces quiet high pressure between 1 pin of fluorescent tube and 2 pin.Meanwhile, between 1 pin and 3 pin of fluorescent tube, also produce voltage difference between 2 pin and 3 pin, under their effect, the fluorescent lamp build-up of luminance is lighted, after the fluorescent lamp operate as normal, ballast ZL is equivalent in parallel with capacitor C, improved the power factor (PF) of circuit so again, the branch road that is made of diode D and resistance R is equivalent in parallel with fluorescent tube, because the reactance after the fluorescent tube operate as normal is less, bypassed by fluorescent tube so the branch road that is made of diode D and resistance R is approximate, start-up circuit is no longer had an effect.

As can be seen from Figure 3, start-up circuit is made of capacitor C, diode D and push-button switch AN, after K switch is closed, presses the button switch again, fluorescent lamp by process starter recited above, light, after the fluorescent tube operate as normal, Panasonic's button, start-up circuit quits work.

As can be seen from Figure 4, start-up circuit is made of capacitor C, diode D and neon bulb, after K switch was closed, neon bulb produced glow discharge under the effect of its both end voltage, make contacting, start-up circuit is started working, and fluorescent lamp is lighted by process build-up of luminance recited above, in case after the fluorescent lamp operate as normal, the neon bulb both end voltage reduces disconnects its contact, and start-up circuit quits work.

Claims

1, a kind of fluorescent lamp that has ballast ZL, K switch is characterized in that: adopt non-filament fluorescent lamp and start-up circuit 5, the O of start-up circuit 5 ₂End is connected on 1 pin of fluorescent tube the O of start-up circuit through rectifier ZL ₁Terminate on 2 pin of fluorescent tube, the I end of start-up circuit and 3 pin of fluorescent tube join.

2, fluorescent lamp according to claim 1 is characterized in that: start-up circuit 5 is made of capacitor C, diode D and resistance R.

3, fluorescent lamp according to claim 1 is characterized in that: start-up circuit 5 is made of capacitor C, diode D and push-button switch AN.

4, fluorescent lamp according to claim 1 is characterized in that: start-up circuit 5 is made of capacitor C, diode D and neon bulb.