CN85102058A - Electrodeless low voltage discharge lamp - Google Patents

Abstract

A kind of electrodeless low voltage discharge lamp that in fluorescent tube (1), has the magnetic core of manufacturing by magnetic material (3), when first coil (7) is when connecting around the magnetic core and with high frequency power supply unit (4), one of lead-in of this coil is that a lead-in with second coil (11) of being with free end (12) carries out electrical coupling.When discharge lamp work, the voltage drop between second coil two ends is in fact equally big with the voltage drop between first coil two ends, and the voltage drop of these two coils to change be reciprocal.Obviously, the interference power on the feeder main that links with discharge lamp, thereby can be suppressed consumingly.

Description

Electrodeless low voltage discharge lamp

The present invention relates to a kind of electrodeless low voltage discharge lamp.The fluorescent tube of discharge lamp is to use the method for airtight vacuum to seal, and is filled with a kind of metallic vapour and a kind of rare gas at least.This lamp has been equipped a kind of magnetic core of being made by magnetic material, when discharge lamp work, produces a high frequency magnetic field by power supply unit and the coil around magnetic core that links with it, thereby also just produced an electric field in discharge lamp.This discharge lamp is from U.S. Pat-PS3, and 521,120 can know.

The described discharge lamp of patent specification is a kind of electrodeless fluorescence low-voltage mercury vapor type discharge lamp.It is operated under the high frequency, and has a bubble shape fluorescent tube and a lamp holder.The shape of lamp holder can make this lamp just can be screwed to easily in the device of using for incandescent lamp and go.The high frequency magnetic field that occurs of portion within it during this discharge lamp work provides by power supply unit, and it is made of the high-frequency oscillating circuits that a frequency is approximately higher than 20KHz greatly.

Obviously, when above-mentioned discharge lamp work, in the conductor of feeder main, be easy to produce hf interference current (producing) by electric light.This can explain with such fact: coil can be regarded as a high-frequency alternating current potential source, this voltage source is to connect mutually with the earth and with the conductor of feeder main by spurious impedance.These disturbance currents may cause the interference to connecting mutually with same feeder main or directly be contained near all electric equipment the discharge lamp.

As for mentioning admissible hf interference current maximum on feeder main, fixed in the world standard stands good, and above-mentioned electric light can satisfy this standard.

For disturbance current being reduced to an acceptable value, patent application 8205025(PHN.10.540 according to Holland), can on tube inner wall, use a kind of transparency conducting layer of low ohm value, and it is connect mutually with a lead-in of feeder main when discharge lamp work.Yan Ge requirement is forced on the conductive layer resistance like this, and meanwhile needs the high grade of transparency to visible light.Obviously, guarantee that it is difficult that these conditions are met simultaneously.

The object of the present invention is to provide a kind of electrodeless low-pressure discharge lamp, it is adapted at supply high frequency voltage and does not exceed under the situation of above-mentioned interference international standard, and this lamp can be with a kind of easy method manufacturing, and has very high luminous efficiency.

According to the present invention,, it is characterized in that at one section this class electrodeless low voltage discharge lamp of mentioning of beginning for above-mentioned purpose: one of lead-in of first coil is to carry out electrical coupling with a lead-in with free-ended second coil; When discharge lamp work, the voltage drop between second coil two ends is in fact equally big with the voltage drop between first coil two ends, and the voltage drop on first coil changes, and is reverse with second coil in some sense; Second coil extends in first coil scope, and is electrically insulated from each other.

The discharge lamp of mentioning among the present invention, the high-frequency electrical that produces on the feeder main when its work is disturbed, and has been reduced to certain value, and this value can satisfy employed international standard.

Can know that the voltage drop in coil means along the reduction of current potential on each unit length on the coil y direction.Because second coil has the same with first coil in fact big and voltage drop that direction is opposite, so, can cause and will all be compensated for the current potential of first coil of interference.Thereby from charged angle, second coil do not have load.The intensity in magnetic field is did not influence in fact.Therefore in fact the luminous efficiency of discharge lamp equates with other lamps known.

Between the wire turn of second coil and the wire turn of first coil is electric insulation.

In an embodiment of this discharge lamp, magnetic core is bar-shaped, and is wrapped up by the cylindrical glass wall part of fluorescent tube.First coil is subsequently around above-mentioned cylinder shape inner wall.Yet second coil is such just as first coil, just can be better around magnetic core itself.On second coil around the number of turn be as many in fact with the number of turn of first coil, do like this in order that obtain satisfied coupling, and the current potential that is produced is carried out the best setoff, and interference power will be inhibited on to greatest extent.

Above-mentioned discharge lamp embodiment has obtained challenging result according to the present invention, and wherein first circle of second coil all is between two adjacent turn of first coil.

Obviously, disturb horse back just to obtain best inhibition.Between two coils, carry out insulation measurement in addition again, also just unnecessary.

This invention can very well be applied on the electrodeless low voltage discharge lamp, and wherein the inwall of fluorescent tube has been used a kind of luminescent layer, and this luminescent layer can change the ultraviolet resoance radiation that produces in the fluorescent tube into visible light.These lamps are applicable to the illumination that room etc. is located, and can be used alternatingly the illumination purpose that reaches general with incandescent lamp.

For the present invention, fully describe with reference to the accompanying drawings.In these accompanying drawings, Fig. 1 represents according to a kind of electrodeless low-pressure mercury vapor type discharge lamp, the broken section of embodiment and local outside drawing of the present invention.Fig. 2 is the diagram to two of representing among Fig. 1 coil position on the discharge lamp magnetic core.

As the discharge lamp that Fig. 1 represents, form by glass lamp (1).This fluorescent tube is with the method sealed knot of airtight vacuum, and portion charges into a certain amount of mercuryvapour and rare gas, for example argon within it.The inwall of fluorescent tube scribbles one deck luminescent layer (2).The magnetic core (3) that this discharge lamp has further also used a bar-shaped magnetic material to make, for example ferrite; When discharge lamp work, high frequency magnetic field wherein is by electric power supply unit (4) and (lead-in in the accompanying drawings can only be seen a part) that leans on lead-in (5) and (6) to link with it and be looped around coil (7) generation on the magnetic core.This magnetic field is deep into fluorescent tube inside, produces so just have an electric field in fluorescent tube.Coil (7) is by the flat type copper wire coiled of a fixing turn.Magnetic core (3) is placed in the interior cylinder shape groove (8) of lamp tube wall, and its riding position is near the longitudinal axis of discharge lamp.Electric power supply unit (4) be arranged at into lamp bowl (9) around the space in, and lamp bowl (9) is manufactured by synthetic material, and links with fluorescent tube (1).It is safe Edison's formula lamp holder (10) to it that the end of lamp bowl is equipped with one, utilizes this lamp holder just it can be screwed in the device that uses for incandescent lamp and goes.

The lead-in (5) of first coil (7) is to fix together with a lead-in of second coil (11).This coil is represented by dotted lines in the accompanying drawings.The free end of this coil indicates with digital (12).So-called second coil fixed way, in order that when discharge lamp work the voltage drop between its two ends in fact with coil (7) two ends between voltage drop equate.But the variation of its voltage drop is reciprocal with the voltage drop of coil (7).This point can fully be explained in Fig. 2.

For this purpose, it is identical with coil (7) that the coil turn that coil (11) comprises is actually.Two coils are electric insulation each other.Each circle of coil (11) all is to be arranged between two adjacent turn of coil (7).

In Fig. 2, the out splice going splice of high frequency power supply unit marks with (13) and (14).Capacitor (15) is connected between two out splice going splices.What use on the out splice going splice is the alternating voltage of frequency as 2.65MHz.Coil (7) also is linked on the above-mentioned joint through lead-in wire (5) and (6).Be connected with lead-in (5), also have a lead (16), it has been the lead-in wire effect to second coil (11) that dots among the figure.Each circle of coil (11) and coil (7) are gone up between the two adjacent circles and are all kept uniform distance.The free end of coil (11) marks with digital (12).

For the sake of clarity, the magnetic core among Fig. 2 omits and does not have picture.In embodiment cited above, voltage just is at the A point, is exactly negative at the B point.A is first end of coil (7), and B is its second end.Thereby at an end C point of coil (11), voltage is also for just.At the free end D of second coil, voltage is for negative.In fact above-mentioned voltage is to compensate for mutually fully, thereby only produces the very weak hf interference current of intensity on the lead-in wire of feeder main.

Discharge lamp shown in Figure 1 was carried out repeatedly experiment.This discharge lamp comprises a fluorescent tube that cylinder clavate magnetic core (long 50mm, the Fei Lipusi 4C6 type ferrite of diameter 8mm) arranged, and first coil on this magnetic core is by 13 circle flat type copper wires (wide 0.38mm, thick 38 μ m) coiled.Distance between two outermost turns that the length (Calipering of this coil records along clavate magnetic core y direction) be 25mm.Clearly, for second coil (also by wide 0.38mm, the strip-like copper filament winding of thick 38 μ m becomes) of 14.5 circles, it is to obtain best interference suppressioning effect.The length of second coil is 30mm.Interference on the feeder main conductor suppresses and can measure, and its method of measurement is by GB standard C ISPR No.15(VDEO871) to carry out, its measurement result is greater than 45dB.

When we are added to the power of 18W on the discharge lamp, its luminous efficiency is approximately 1200 lumens, and the luminescent layer that tube inner wall is used be the terbium that activates by cerium, magnesium, aluminium of mixture ， Calipering green emitting of two kinds of phosphors and emitting red light by the europkium-activated oxidation Yttrium of trivalent.Comprise the mercury of 6mg and 70 Pascals' argon gas in the fluorescent tube.

Errata

CPEL855132

Claims (3)

1, a kind of electrodeless low-pressure discharge lamp is made up of fluorescent tube.Fluorescent tube is with the method sealing-in of airtight vacuum, and charges into a kind of metallic vapour and a kind of rare gas at least.This discharge lamp is equipped with the magnetic core of being manufactured by magnetic material, when discharge lamp work, produce a high frequency magnetic field by electric power supply unit and the coil around magnetic core that links with it, thereby just produced an electric field in fluorescent tube, it is characterized in that: one of lead-in of this coil is to carry out electrical coupling with a lead-in with free-ended second coil; When discharge lamp work, the voltage drop between second coil two ends is in fact equally big with the voltage drop between first coil two ends, and the voltage drop on first coil changes, and is reverse with second coil in some sense; Second coil extends in first coil scope, and is electrically insulated from each other.

2, electrodeless low voltage discharge lamp as claimed in claim 1 is characterized in that, second coil is also around magnetic core; The number of turn of second coil is in fact with the equal turn numbers of first coil.

3, electrodeless low voltage discharge lamp as claimed in claim 2 is characterized in that, each circle of second coil all is between two adjacent turn of first coil.

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