CN1161565A - Discharge light source with reduced magnetic interference - Google Patents
Discharge light source with reduced magnetic interference Download PDFInfo
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- CN1161565A CN1161565A CN96107661A CN96107661A CN1161565A CN 1161565 A CN1161565 A CN 1161565A CN 96107661 A CN96107661 A CN 96107661A CN 96107661 A CN96107661 A CN 96107661A CN 1161565 A CN1161565 A CN 1161565A
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Abstract
A simple and effective technique for reducing an external magnet flux emitted from a driven inductor surrounded by an ionizable gaseous medium. This technique includes surrounding the inductor with at least one shielding conductive loop, terminating the shielding loop in a capacitive termination to resonate, and maintaining a resonant frequency of the capacitive termination in series with an inductance of the shielding loop below the predetermined driving frequency of the inductor.
Description
The present invention relates to a kind of induction discharge light source, relate in particular to the charging source that can reduce the external magnetic interference.
As everyone knows, the electrodeless low voltage discharge lamp of induction coupling has many advantages.A kind of typical inductively coupled discharge lamp comprises a bulb, and bulb seals by the vacuum tight mode and fills metallic vapour and rare gas with utmost point low-pressure.By a high frequency electric source (more than 20 kilo hertzs) excitation inductor,, inductor forms discharge so making at inductor and cover in the space between the fluorescence coating of bulb internal surface.
The problem that gaseous discharge lamp occurred between the operating period is will generate an electromagnetic field in the outside of lamp, and this electromagnetic field produces hf interference current on power line.As a result, particularly the magnetic component of electromagnetic field might produce interference in other the electric equipment (Source Music and television set) that links to each other with this power line.Therefore, reducing electromagnetic interference (EMI), especially reduce the interference of its magnetic component, is one of the sixty-four dollar question of the induction discharge lamp of viable commercial.
In this area, the magnetic flux outside the lamp housing that reduces the inductively coupled discharge lamp was done to attempt.
For example, U.S. Patent No. 4,245,179 and No.4,254,363 have just described that attempt reduces because the geometry of the primary induction coil of the total magnetic flux that discharge causes.But in general these technology are not very practical, and be not easy to obtain data prove that they are in the validity that reduces aspect the outside magnetic flux.
U.S. Patent No. 4,645,967,4,704,562,4,727,294,4,920,297,4,940,923 instructions that provide are to use the anti-interference ring 10,11,12 of the short circuit of one group of conduction, and they are fixed to the outside of lamp housing and make them surround discharge vessel (high-visible as Fig. 1).When pressing induction mode excitation discharge, these rings 10,11 and 12 produce an electric current, and the magnetic flux that this electric current produces is opposite with the direction of main flux, can offset the magnetic surface of some primary induction coil.The shortcoming of this technology is not to be very effective, and finds that the magnetic flux that each ring can only make discharge send reduces about 1.8-2.0 decibel (dB).Strong expectation can have otherwise effective technique more to reduce the magnetic component of the electromagnetic field that discharge lamp produces in this area.
Therefore, an object of the present invention is to provide a kind of simple and effective technology and significantly reduce to disturb from the external magnetic that any induction discharge sends, this induction discharge is to keep by an inductor hollow or ferrite core that is driven by radio-frequency power supply.
Another object of the present invention provides a kind of discharge lamp that reduces magnetic disturbance.
Though the present invention can be applicable to shield the magnetic component of the electromagnetic interference that is produced by the excitation induced high-frequency discharge, the present invention is reducing aspect the outside magnetic flux of discharge lamp effusion its particular utility is arranged also.
By instruction of the present invention, surround with a screening conductive ring and to be used for keeping induction discharge, that insert gas medium and by the inductor of predetermined radio frequency driving.This shading ring stops a capacitance terminal, so that keep resonance under the resonance frequency of a predetermined driving frequency that is lower than inductor.
Comprise the gas medium of the metal (preferably mercury and sodium) of a kind of rare gas (from the inert gas group, selecting) and a kind of gasification at the transparent lamp housing inner sealing of a sealing.Deposit one deck fluorescent material on the inner surface of lamp housing, inductor is contained in the lamp housing.
A supply unit applies high frequency power so that at electromagnetic field of the inner generation of lamp housing to the primary coil of inductor, is used for keeping the induction discharge of gas medium.This fluorescent material is luminous in response to the discharge in the gas medium.
Shading ring can be fixed to the outside or inner of lamp housing, and can become a conducting film that is deposited on the lamp housing.Also have, shading ring can comprise a plurality of separate shading rings, and each independent shading ring all terminates in a corresponding capacitance terminal, this shading ring or can be the conducting ring of a multi-turn, and it terminates in a capacitance terminal.
Inductor or comprise a hollow inductor, or a ferrite core inductor just become as long as inductor does not constitute a closed magnetic circuit.
For operating position, select lamp housing and gas medium greater than the frequency of 1 megahertz.
After having read following explanation in conjunction with the accompanying drawings, these purposes of the present invention and other purpose all will become clear.
Fig. 1 is the schematic diagram by the electrodeless low voltage discharge lamp with anti-interference ring of prior art;
Fig. 2 is the schematic diagram that reduces technology by magnetic disturbance of the present invention;
Fig. 3 schematically represents the electrodeless low voltage discharge lamp that has a shading ring by of the present invention;
Fig. 4 is the schematic diagram of an experimental rig;
Fig. 5 is the curve chart with respect to the shielding that is added to the voltage on the primary coil;
Fig. 6 is the curve chart of the voltage of induction on the inspection ring with respect to the relative amplitude of sensing the voltage on the magnetic detection ring and phase place;
Fig. 7 is expression to the series inductance of the primary coil of three kinds of different terminals and quality factor " Q " curve chart with the variation of frequency;
Fig. 8 is expression to the voltage of the magnetic detection ring of the four kinds of different terminals curve chart with respect to the amplitude of primary coil voltage;
Fig. 9 is that expression is to the primary inductance of capacitor terminal and C/R terminal and the curve chart of the variation of quality factor " Q " on the 4-8 mhz spectrum;
Figure 10 schematically illustrates a plurality of independently shading ring of the present invention;
Figure 11 schematically represents to be fixed on a shading ring of the present invention of lamp housing inside;
Figure 12 schematically represents the shading ring of a multi-turn of the present invention.
With reference to Fig. 2, electrodeless low voltage discharge lamp 13 comprises a clear glass lamp housing 14, and lamp housing 14 is pressed air tight manner sealing, and include the formation that is under the low-pressure very the rare gas of ionogenic gas medium 15 (as, argon) and the metal of gasification (as, mercury).Lamp housing 14 has a bulb 16 and a cavity 17 (or recessed portion of lamp housing 14), is provided with the primary coil 18 that is made of the multi-turn copper cash in the cavity 17.Primary coil 18 is parts of inductor 19, and inductor 19 can be hollow inductor, or magnetic ferrites core inductor.If select magnetic ferrites core inductor 19, then in cavity 17, provide a bar core (this core can be a magnetic ferrites pipe) by the magnetic material (magnetic ferrites) of primary coil 18 encirclements.
The inwall 21 of lamp housing 14 is coated with the transparent layer 22 with of being made of luminescent substance, luminescent substance normally by slaine several fluorescence or phosphorescence (as, artificial schellite, zinc sulfate and/or zinc silicate) a kind of mixture of forming.
Lamp produced the electromagnetic field of high frequency, and will guarantee can keep induction discharge in lamp housing 14 between 13 operating periods in lamp housing 14.The overwhelming majority of this discharge generation is ultraviolet ray, and they are sightless.The fluorescent material of UV-irradiation layer 22, the radiation of sending longer wavelength, its wavelength is at the visible-range of spectrum.Suitably select fluorescent material, just can make this light have any desired color.
Disturb in order to effectively reduce this external magnetic do not expected, provide at least one screening conductive ring 23, as Fig. 2 and 3 high-visible for discharge lamp 13.Shading ring 23 surrounds at the lamp housing 14 inner region of discharges that produce and keep.For ease of explanation, in Fig. 2 and 3, only express a shading ring 23; But if desired, then can use a plurality of shading rings.
Each shading ring 23 all terminates in the suitable reactance component 24.With induction mode excitation discharge the time, shading ring 23 produces an electric current, and the direction of the direction of the magnetic flux that this electric current produces and the main flux of primary coil outside is opposite, has therefore offset some magnetic flux of primary induction coil 18 effectively.Because the electric current in the inflow ring 23 that is produced is worked energetically the electric current in the simple closed (in prior art), so the reduction of observed magnetic disturbance is the 6-25 decibel, and this reduction when using the plurality of closed ring is the 1.8-2.0 decibel.
In other some factors, the accurate reduction of magnetic flux depends on the specific reactance component 24 of coupling situation between primary coil 18 and the shading ring 23, shading ring 23 terminations and poor between the resonance frequency of the ring 23 of the frequency (a predetermined driving radio frequency) of discharge work and termination.
Making the effectively main key of this technology is to select to stop the correct reactance component 24 of shading ring 23, makes the electric current in the ring 23 that suitable amplitude be arranged, and its current phase is wanted and to flow through the phase place of electric current of the primary coil 18 of keeping discharge opposite.Because shading ring 23 is always inductive in the electrical characteristics direction, therefore the characteristic of terminal reactance component 24 is always capacitive as a whole, and may comprise the frequency range that some resistance reduce with the broadening magnetic flux (is cost to sacrifice several decibels validity).
Those of ordinary skill in the art is obviously clear, and selecting terminal reactance component 24 is not to be conspicuous.A frequency place that produces the frequency of resonance in the reactance a little more than reactance of making up shading ring and terminal can realize maximum magnetic screen.In order obviously to reduce the magnetic flux of discharge lamp 13 outsides, the combination resonance frequency of encircling 23/ terminal 24 should be lower than the frequency that drives discharge lamp 13.If terminal reactance component 24 makes the frequency of shading ring 23 resonance a little more than driving frequency, then to observe reverse effect, the magnetic flux of discharge lamp 13 outsides is greater than the magnetic flux when not being with shading ring 23 on the contrary.It also is worthless that shading ring 23 and terminal 24 just produce resonance in the driving frequency of discharge lamp, because this will cause the increase of outside magnetic flux, and will greatly increase loss in the primary coil 18.
For above-mentioned effect is described, use testing stand shown in Figure 4 to measure (Fig. 4 is used for confirming the primary coil 18 of this effect and the geometry schematic diagram of each shading ring).(forms, have 28 circles, external diameter about 1 (1.25 ") inch by 4 inches long by the coil of 4 ") for primary coil 18 (ring 25).The about 8 μ H (microhenry) of the inductance of this coil.The external diameter of electromagnetic field (emf) inspection ring 26 is 2 inches, and (2 ") are used to measure the electromagnetic field (emf) on this diameter.Shading ring 23 is one 4 inches, and (ring of 4 ") external diameter, the electric current that this ring produces can be offset the magnetic flux that primary coil 18 produces.Terminal reactance component 24 is inserted in this shading ring 23.Magnetic detection ring 27 is electrostatic screen magnetic detection rings, about 14 inches (14 ") of its external diameter.The shielding amount of using this ring 27 to indicate shading ring 23 to realize.For all tests described herein, electromagnetic field inspection ring 26 and shading ring 23 all are in the mid-plane of primary induction coil 18.In order to verify this magnetic screen technology, use a HP4194A type gain/phase and impedance analysis device, near the frequency spectrum the primary coil driving frequency, carry out gain/phase and impedance measurement.
Fig. 5 is illustrated under following three kinds of situations, in the frequency range of 1 megahertz-5 megahertz (MHz), at primary coil voltage and sense amplitude (is unit with the decibel) between the voltage on the magnetic detection ring and the ratio of phase difference, these three kinds of situations are: open circuit shading ring (essentially no shielding action), short circuit shading ring (prior art) and terminal shading ring (the present invention).Sense the voltage of magnetic detection ring 27 and be directly proportional from the magnetic disturbance of driven primary coil 18.Under open circuit situation, can ignore relative magnetic flux with the reducing of frequency, because the just frequency response of magnetic detection ring 27 that this situation is represented simply.The magnetic screen amount that produces at the voltage that is added on the primary coil 18 is not add the magnetic flux of shielding and be added with poor between the magnetic flux of shading ring (short-circuited conducting sleeve or end ring).The shielding that the short-circuited conducting sleeve of prior art shown in Figure 5 produces is about 1.8 decibels and and frequency-independent.End ring 23 provides the shielding of " bearing " in the frequency of the resonance frequency that is lower than end ring 23 (about 2.5 megahertzes), has promptly increased the magnetic flux from primary coil 18; And under the frequency of the resonance frequency that is higher than it, the shielding action that end ring 23 provides is but much bigger than the shielding action that short-circuited conducting sleeve provides.Two small circles among Fig. 5 are represented maximum magnetic flux shielding point and the respective phase response that takes place at 2.74 megahertzes.The maximum reduction of magnetic flux in this case is lower than about 8 decibels of the result who does not add shielding.This specific character of end ring has been represented their basic function: under the frequency that is lower than the end ring resonance frequency, the magnetic flux amount of obtaining increases; And under the frequency of the common frequency that is higher than it, the magnetic flux amount of obtaining reduces relatively.Can reach a conclusion from the relative amplitude and the phase data of magnetic flux, if be lower than resonance frequency, the electric current of inflow terminal ring 23 is identical with sense of current in the primary coil, has increased the magnetic flux that it surrounded, and the electromagnetic interference (EMI) magnetic component from primary coil is increased.And if be higher than resonance frequency, the electric current that flows into terminal point ring 23 is opposite with the sense of current in the primary coil 18, therefore offsets the total magnetic flux that (has reduced) they encirclements, and the magnetic disturbance from primary coil 18 is reduced.According to these measurement results, can regard end ring 23 as the magnetic shielding element of a frequency sensitive, it must could work effectively at the frequency low-resonance of the driving frequency that is lower than discharge.
Data representation shown in Figure 5 be shielding amplitude with respect to the voltage that is added to primary coil 18; But Fig. 6 has provided the clearer and more definite tolerance of meaning of the validity of magnetic screen, and Fig. 6 represents is to sense voltage on the electromagnetic field inspection ring 26 with respect to the relative amplitude of sensing the voltage on the magnetic detection ring 27 and phase place.Because shading ring 23 has been offset some magnetic field from primary coil 18, has reduced the voltage of sensing electromagnetic field inspection ring 26 slightly so encircle 23.Because this induced voltage represent the driving voltage of the fundamental component of induction discharge,, measures more accurately the ratio between this induced voltage and the outside magnetic flux so being of validity of shielding.Therefore as can be seen from Figure 6, with respect to the voltage of keeping discharge, short-circuited conducting sleeve has reduced 1.6 decibels effectively with magnetic flux interference, and end ring has reduced 6.5 decibels with magnetic flux interference.
Fig. 7 illustrates the tandem electric inductance of primary coil and the situation that quality factor " Q " become with frequency at 3 kinds of different terminal lists of the shading ring of mentioning in early time 23.The data of Fig. 7 are supported the data of Fig. 5.For open circuit ring, the inductance L of primary coil
sIt almost is a constant; For short-circuited conducting sleeve, inductance L
sSlightly reduce, this is the cause that the magnetic flux in the primary coil 18 is reduced slightly because of the electric current by short-circuited conducting sleeve.For shading ring (end ring) 23, be lower than under the frequency of resonance frequency L
sL during greater than the open circuit ring
s(this shows: end ring has an electric current that has increased the total magnetic flux that it surrounded to flow); And be higher than under the frequency of resonance frequency L
sL during less than the open circuit ring
s(this shows: end ring has an opposite electric current of total magnetic flux that is surrounded with it to flow).L in this case
sPeak change be about+/-9%.
Also express the curve of the quality factor " Q " of primary coil among Fig. 7, because their expressions is the reality " cost " of magnetic screen, so they also are the emphasis of discussing.In the whole frequency range shown here, for " Q " factor maximum of open circuit ring; " Q " factor for short-circuited conducting sleeve is smaller; For end ring, " Q " factor quite little (relevant), and " Q " factor minimum when resonance takes place with frequency.This result shows that obviously the apparent Q factor of primary coil comprises the ohmic loss of the electric current that flows into shading ring 23.Thereby from essence, the power loss in the shading ring 23 is to reduce electromagnetic interference magnetic component required " cost ".
For end ring 23, be 38 at " Q " factor of the primary coil of 2.74 megahertzes, this " Q " factor when shading ring is opened a way then is about 300.The ratio of the gross power that is delivered to coil (discharge power with) obviously is reduced to a unacceptable degree if the power that consumes in the shading ring 23 makes power transmission efficiency, and this serious decline of " Q " factor so in this case bring problem just might for the discharge of lamp.Whether " Q " factor descends is marginal problem relates to the correlation between the resonance frequency of " Q " factor of phase angle between the voltage and current of discharge, ring/terminating circuit and driving frequency (being suppressed) and end ring.Observed in this case low " Q " factor mainly is that this Terminal Capacitance device is the capacitor of a kind of " bypass " type owing to there is the event of Terminal Capacitance device, and it is 0.394 ohm in the series resistance of 2.7 megahertzes.Use the Terminal Capacitance device of better quality may improve " Q " factor.The series resistance of the Terminal Capacitance device of better quality is lower, therefore can increase total " Q " factor, improves magnetic screen; Below in conjunction with the data that obtain at 6.78 megahertzes this is discussed.In addition, from Fig. 7 obviously as can be seen, if use this technology at the upper frequency that can obtain maximum shield effectiveness, shield effectiveness can slightly descend, but also may be more effective than short-circuited conducting sleeve, and " Q " factor under this frequency may not can obviously influences power delivery.
By measuring near 6 megahertzes voltage on the magnetic detection ring with respect to the amplitude of primary coil voltage (as the voltage among Fig. 5), the series resistance of terminal of investigating shading ring under slightly high frequency is to the result that influences of " Q " factor of shield effectiveness and primary coil.Use four kinds of different terminals: the silver-mica capacitor device (R of open circuit ring, short-circuited conducting sleeve, 1.88nF
s=0.033 Ω), with the 1.88nF silver-mica capacitor device (, being referred to as C/R) of 1.2 Ω resistor in series from this.In Fig. 8, express the result of this measurement in the frequency range between 4 and 8 megahertzes.As can be seen from Figure 8, for short-circuited conducting sleeve, magnetic flux has descended about 2 decibels; For the 1.88nF capacitor terminal, magnetic flux decline is (the electromagnetic interference magnetic component is maximum to descend about 20 times) up to 26 decibels; For the C/R terminal, magnetic flux descended about 6 decibels (maximums).In 6.78 megahertzes (an optional frequency), for capacitor terminal, magnetic flux descends about 16 decibels; And for the C/R terminal, magnetic flux descends about 5 decibels.
Fig. 9 expresses the situation of change of capacitor terminal and the primary inductance of C/R terminal on the frequency spectrum between 4 and 8 megahertzes and " Q " factor.For capacitor terminal, the primary coil maximum induction be do not add when shielding value+/-75%.This huge inductance variation shows that shading ring is quite strong to the influence of primary coil characteristic during resonance.But it should be noted that the variation of primary consumer is less than 10% in this device shielding the most effective frequency of magnetic flux (being approximately higher than resonance frequency 300-400 kilohertz).So little variation of primary consumer unlikely influences the use of discharge lamp.For the C/R terminal, the variation of primary inductance is much smaller.
In Fig. 9, also express the data of " Q " factor of primary coil with frequency change." Q " factor that the C/R terminal provides has a minimum value that scope is very wide, this minimum value low may not be practical." Q " factor of electric capacity end ring changes quite precipitous, and near " Q " factor except that the resonance frequency is all than " Q " factor of C/R terminal much higher (" Q " factor scale in Fig. 9 is 100/ lattice).For example at 6.78 megahertzes, " Q " factor of capacitor terminal is about 160, and this will make primary coil increase minimum because of the loss that shielding produces.From the data shown in Fig. 8 and 9 as can be seen, the resistance that reduces shading ring 25 will increase the validity of shielding, also can reduce the power loss of primary coil because of producing with intercoupling of shading ring 23 simultaneously.
Schematically illustrate out as Fig. 2, shading ring 23 is located at the outside of lamp housing 14.Shading ring 23 can be a ring (as, copper), also can be a conducting film of deposit on the glass wall 21 of lamp housing 14.This film should be a goodish good conductor, does not consume too many energy.
Yet, on principle, have reason the shading ring form of film (ring or) fully to be placed on the inside (high-visible) of lamp housing 14 as Figure 11.Certainly, also should consider the problem of the compatibility of the material between shading ring 23 and the lamp housing gas inside medium (as, mercury).For example, if mercury is the part of gas medium, then the copper becket that the gaseous environment in the bulb is opened is not a good selection just, because copper and mercury are unfavorable for the reaction that lamp uses with generation.From the compatibility viewpoint to mercury, tungsten may be a good selection.In addition, also must use gastight and with the encapsulated capacitor material of mercury/buffer gas discharge gas environmentally compatible.
Can use a plurality of shading rings 23 to shield external magnetic disturbs.Just can be identified for the standard of a plurality of rings very simply by required shielding amount.Two shading rings are not than a shading ring more effectively (though validity can just in time be twice).As single shading ring, when the plane parallel of ring during in the plane of driven primary unit, a plurality of shading rings may be the most effective.These shading rings are (high-visible as Figure 10) independently of one another, can also use the shading ring (high-visible as Figure 11) of a multi-turn and not use and a plurality ofly independently encircle 23.The resonance of multi-turn shading ring may need less electric capacity.
The optimum position of shading ring 23 is mid-planes of region of discharge, also needn't very accurately be located at here certainly.Shading ring 23 can be or not the center of this mid-plane.Ring 23 must be as far as possible near driven inductor, so that obtain enough couplings closely, the magnetic flux that induces driven inductor 19 reduces to minimum necessary electric current.If encircle 23 outsides that are located at bulb 16, the zona of a copper metal of deposit (for example, by the plasma vapor deposition) on glass surface makes zona disconnect in certain position that is being connected with Terminal Capacitance device 24 so at an easy rate.When shading ring 23 is made by the highest material of conductivity, just can produce maximum inhibition to electromagnetic interference; Yet the ring material relatively poor with electric conductivity also can obviously reduce electromagnetic interference.By the way, can make Terminal Capacitance device 24 very little, because this capacitor 24 only needs the rated voltage of maximum several volts.
The invention provides a kind of new technology that reduces from the magnetic disturbance of inductively coupled discharge, it is than the in fact high order of magnitude of validity of technology described in the prior.The present invention confirms, with the end ring encirclement inductor of a resonance frequency a little less than driving frequency, just can reduce to disturb from the external magnetic of driven inductor.This result shows that the all-in resistance of shading ring circuit influences the validity of shielding consumingly, and influences power transmission efficiency.Increase the resistance of shading ring circuit, will reduce primary coil " Q " factor, make resonance region broaden, reduce the degree of magnetic screen and increase power consumption in the shading ring.From quantitative angle, poor between the degree of coupling between the accurate geometry position of primary coil and shading ring, two rings and shading ring resonance frequency and the driving frequency all can influence the relation between shading ring resistance and the primary coil characteristic.Though this technology is discussed in conjunction with electrodeless low voltage discharge lamp, should regard this technology as can reduce electromagnetic interference technology in different application scenarios.More than described a kind of technology that simply reduces electromagnetic interference, it has reduced the external magnetic flux that sent by the inductor coil that radio frequency source drives greatly.This technology has reduced the magnetic disturbance of being sent by any induction discharge that hollow inductor or ferrite core inductor are kept greatly, just becomes as long as ferrite core does not form closed magnetic circuit.
Obviously, under the condition that does not depart from basic design of the present invention, can make many improvement.Therefore, those of ordinary skill in the art should be clear, in appended claim scope, except specifically described mode here, can also otherwise implement the present invention.
Claims (22)
1. method that reduces the outside magnetic flux that sends by the inductor that ionizable gaseous medium surrounds, inductor wherein comprises the primary coil of the driving radio-frequency driven that a usefulness is predetermined to keep induction discharge, this method comprises the steps:
Surround inductor with at least one screening conductive ring with inductance;
At said at least one shading ring of capacitive character terminal termination, make this terminal and said at least one screening conductive environment-development give birth to resonance; And
Make the resonance frequency of the capacitive character terminal of connecting be lower than the predetermined driving frequency of primary coil with the inductance of shading ring.
2. method as claimed in claim 1, induction discharge is wherein kept in an electrodeless low voltage discharge lamp, and this method further comprises following steps:
A transparent lamp case of filling the sealing of said gas medium is provided, and said gas medium comprises rare gas and gasified metal;
Inductor is put into lamp housing;
Deposit one deck fluorescent material on the inner surface of lamp housing;
The device that applies high frequency power to said primary coil is provided, so that in lamp housing, produce the electromagnetic field keep the induction discharge in the said gas medium, the discharge in the said fluorescent material response gas medium and luminous.
3. method as claimed in claim 2 further comprises following steps: at lamp housing external stability shading ring.
4. method as claimed in claim 2 further comprises following steps: at the internal fixation shading ring of lamp housing.
5. method as claimed in claim 1 further comprises following steps: surround inductor with a plurality of independently shading rings, each ring wherein all terminates in a corresponding capacitance terminal.
6. method as claimed in claim 1, wherein said shading ring comprise a multi-turn conducting ring that terminates in capacitance terminal.
7. method as claimed in claim 1 further comprises following steps: at the mid-plane location of primary coil shading ring.
8. method as claimed in claim 1, inductor wherein comprise a hollow inductor.
9. method as claimed in claim 1, inductor wherein comprise a ferrite core inductor.
10. method that reduces the magnetic flux of electrodeless low voltage discharge lamp outside, this method comprises the steps:
A transparent lamp case of filling the sealing of ionizable gaseous medium is provided, and said gas medium comprises rare gas and gasified metal;
Inner surface deposit one deck fluorescent material at lamp housing;
In lamp housing inside inductor is set, this inductor comprises a primary coil;
Provide to said primary coil and be applied with the predetermined device that drives the power of radio frequency, so that in lamp housing, produce the electromagnetic field that maintains the induction discharge in the said gas medium, the discharge in the said fluorescent material response gas medium and luminous;
Surround inductor with at least one screening conductive ring;
Stop said at least one shading ring at a capacitive character terminal, this terminal and said at least one shading ring are resonated; And
Make the resonance frequency of the capacitive character terminal of connecting be lower than the predetermined driving frequency of primary coil with the inductance of shading ring.
11. one kind can reduce the discharge lamp that external magnetic is disturbed, comprise:
A transparent lamp case that is filled with the sealing of ionogenic gas medium, said gas medium comprises rare gas and gasified metal;
One deck fluorescent material in the deposit of lamp housing inner surface;
An inductor that is contained in the lamp housing, this inductor comprise a primary coil;
Apply the predetermined device that drives the power of radio frequency to said primary coil, to produce the electromagnetic field that maintains the induction discharge in the said gas medium in said lamp housing, said fluorescent material is luminous in response to the discharge in the gas medium;
Surround at least one screening conductive ring of this inductor; And
Said at least one shading ring terminates in a capacitive character terminal, so that this terminal and said at least one shading ring resonate, wherein:
Make the resonance frequency of the capacitive character terminal of connecting be lower than the predetermined driving frequency of primary coil with the inductance of shading ring.
12. as the discharge lamp of claim 11, wherein said at least one shading ring is fixed on the lamp housing outside.
13. as the discharge lamp of claim 11, wherein said at least one shading ring is fixed on lamp housing inside.
14. as the discharge lamp of claim 11, inductor is wherein surrounded by a plurality of independently shading rings, each shading ring all terminates in a corresponding capacitive character terminal.
15. as the discharge lamp of claim 11, wherein said shading ring comprises the conducting ring of a multi-turn that terminates in the capacitive character terminal.
16. as the discharge lamp of claim 11, wherein said at least one shading ring is positioned at the mid-plane of primary coil.
17. as the discharge lamp of claim 11, inductor wherein comprises a hollow inductor.
18. as the discharge lamp of claim 11, inductor wherein comprises a ferrite core inductor.
19. as the discharge lamp of claim 11, wherein at selecting lamp housing and discharge medium greater than the operation of 1 mhz frequency.
20. as the discharge lamp of claim 11, rare gas wherein chooses from following this group gas: argon, krypton, xenon and neon.
21. as the discharge lamp of claim 11, gasified metal wherein is to choose from the group of mercury and sodium composition.
22. as the discharge lamp of claim 11, wherein said at least one shading ring comprises a conducting film that is deposited on the lamp housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96107661A CN1161565A (en) | 1995-06-14 | 1996-06-14 | Discharge light source with reduced magnetic interference |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US490,216 | 1990-03-08 | ||
| CN96107661A CN1161565A (en) | 1995-06-14 | 1996-06-14 | Discharge light source with reduced magnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1161565A true CN1161565A (en) | 1997-10-08 |
Family
ID=5119682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96107661A Pending CN1161565A (en) | 1995-06-14 | 1996-06-14 | Discharge light source with reduced magnetic interference |
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| Country | Link |
|---|---|
| CN (1) | CN1161565A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692418B (en) * | 2004-04-16 | 2011-10-19 | 奥斯兰姆施尔凡尼亚公司 | Electrodeless fluorescent lamp |
| CN106663867A (en) * | 2014-06-17 | 2017-05-10 | 高通股份有限公司 | Em coupling shielding |
-
1996
- 1996-06-14 CN CN96107661A patent/CN1161565A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101692418B (en) * | 2004-04-16 | 2011-10-19 | 奥斯兰姆施尔凡尼亚公司 | Electrodeless fluorescent lamp |
| CN106663867A (en) * | 2014-06-17 | 2017-05-10 | 高通股份有限公司 | Em coupling shielding |
| CN106663867B (en) * | 2014-06-17 | 2019-11-08 | 高通股份有限公司 | EM coupling shielding |
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