CN1045515C - Electronic ballast for high-strength gas discharge lamp - Google Patents
Electronic ballast for high-strength gas discharge lamp Download PDFInfo
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- CN1045515C CN1045515C CN96122931A CN96122931A CN1045515C CN 1045515 C CN1045515 C CN 1045515C CN 96122931 A CN96122931 A CN 96122931A CN 96122931 A CN96122931 A CN 96122931A CN 1045515 C CN1045515 C CN 1045515C
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Abstract
The present invention relates to an electronic ballast of a high strength gas discharge lamp, which comprises a power rectifier, a filter, an inverter and a ballasting inductor. The present invention is characterized in that a controller is arranged at the output end of the inverter, output high frequency current samples are converted into two signals by the controller, and the signals are overlapped and sent to the input end of a control element, and the output end of the control element controls the operation frequency and the output current of the inverter. The phenomena of acoustic resonance can be effectively controlled, the present invention has an abnormal state protection function, a current following filter or an active harmonic filter is adopted, and the present invention has the advantages of high power factor, simple structure and low cost. The present invention is widely used for the matching operation of high voltage sodium lamps, mercury lamps and metal halide lamps.
Description
The invention belongs to electronic technology field, further relate to a kind of electric ballast of gaseous discharge lamp.
Gaseous discharge lamp (also HID lamp) comprises that high-pressure sodium lamp, mercury lamp and metal halide lamp, its luminous efficiency and useful life are more than five times of incandescent lamp; Compare with fluorescent lamp, its volume is little, power is big, and distribution controls is easy in lighting, so applied range.
Matching used with it in the market ballast thumping majority is an inductance type, and shortcoming is that volume is big, heavy, power factor is low, loss is very big.Nowadays many to the electric ballast development person of gaseous discharge lamp both at home and abroad, and finished product is seldom seen on the market, why? this is because of the viewpoint according to Weida's paper, if the reflected wave homophase of the high-frequency oscillation voltage that electric ballast produced of gaseous discharge lamp and discharge lamp inwall, produce standing wave in the guiding discharge lamp, promptly so-called " acoustic resonance " phenomenon.Its harmfulness be lamp be triggered light after, operating current sharply increases in planting somewhat, makes the electrical discharge arc instability, is in runaway condition, and blow-out immediately.Through after repeatedly repeating to light, finally burn electric ballast or damage discharge lamp like this.This " acoustic resonance " phenomenon shows particularly serious in high-pressure sodium lamp and metal halide lamp.
Patent name is " high-pressure sodium lamp high-frequency electronic ballast " (Granted publication number: CN2178977Y), be provided with pulse control module M, the semi-bridge switching voltage regulator circuit that constitutes by rectifying tube QL, field effect transistor V1, V2 and serial-resonant starting circuit, by opening of relay J control resonance shake and sodium vapor lamp starter and starter after failure of oscillation.Advantage is easy for installation, has improved power factor.Its shortcoming does not propose to solve the technical scheme of " acoustic resonance " equally.
Chinese patent " electronic ballast for high-pressure discharge lamp " (notification number 2119073U) discloses the electric ballast that is used for high-voltage gas discharging light, and it is made up of input filtering and protective circuit, current rectifying and wave filtering circuit, higher-order of oscillation switching circuit, high-voltage trigger, high pressure trigger turn-off circuit, output circuit.Start a difficult problem though this technology has solved high-frequency inversion, high-tension ignition, propose to solve the scheme of the electric arc shakiness that " acoustic resonance " cause, also test shows, and its power factor is only more than 0.6.
Be published in (Japan) illumination and can will be entitled as electric arc shakiness, the blow-out phenomenon that causes by " acoustic resonance " at the HID lamp in " research of high-intensity gas discharge lamp electronic ballast circuit " literary composition on 1988 the 72nd the 2nd phases of volume, through a large amount of experiments, proposing solution has following four kinds:
1, direct current time-sharing operation append mode;
2, DC stacked mode;
3,1KH
ZThe time-sharing operation append mode;
4, square wave stacked system.
Paper the author point out in conclusion: the square wave stacked system is unique effective way.Its circuit arrangement is that a switching frequency is 42KH
ZHalf-bridge inversion circuit is established the identical and switching frequency 120H of structure in addition again
ZThe half-bridge inversion circuit of square wave, the square wave of its output 42KH that is added to
ZHigh-frequency current on light the HID lamp, the operating current of two kinds of different frequencies has destroyed " acoustic resonance " in the HID lamp effectively, makes light output stable.Because it sets up a square wave inverter circuit, the circuit complexity, cost heightens, and is difficult to the large-scale popularization application.
" high pressure discharge lamp lighting apparatus " (publication number: CN1119820A of PANASONIC electrician Co., Ltd. application, day is disclosed: the lamp device that on April 3rd, 1996) discloses a kind of high-pressure discharge lamp, the method that comprises at least one pair of switch element conducting and end converts direct current to the inverter circuit of alternating current, wherein at illuminating state not, the inversion frequency of switch element is configured to the resonance frequency greater than the series resonant circuit of related connection with lamp, can start lamp.But when the discharge tube lighting state, be set to resonance frequency, and be in the scope that does not vibe, can utilize the voltage on the capacitor in the series resonant circuit will light high-pressure discharge lamp simultaneously less than resonant circuit.Its control device encourages with batch (-type), it further comprises a device, capacitive vibration between pair of switches element when high-pressure discharge lamp vibrates with capacitive when lighting in order to detection on the tie point is ended the control signal of control device is imposed on the interior switch element of inverter circuit.It is more a little than No. the 4592849th, United States Patent (USP) and No. 4868463 practicality, can realize starting to the continued operation of steadily lighting from high-pressure discharge lamp the sympathetic response when also having avoided high frequency to light smoothly.In conjunction with the accompanying drawings, from describing, specification finds out that this inventive circuit complexity and the described circuit arrangement of above-mentioned paper are similar.
The purpose of this invention is to provide compared with prior art a kind of, simple in structure, with low cost, power factor is high, have the abnormal condition protection function, can effectively eliminate the electric ballast of a kind of gas electric light of " acoustic resonance " phenomenon again.
For achieving the above object, solution of the present invention is: a kind of electric ballast of gaseous discharge lamp, it is an electronic circuit that is contained in the housing, by power rectifier, filter, inverter, the ballast inductor device constitutes, the output that it is characterized in that described inverter, in the current supply circuit of gaseous discharge lamp, also be provided with the inverter of elimination " acoustic resonance ", a control element is equipped with in its inside, the control utmost point of a power tube in the output anode of control element and the said inverter is connected, the input of power tube, the output signal public electrode is connected with the cathode terminal of control element, the input control utmost point of control element is connected to the series circuit and the capacitor of rectifier diode and diac respectively, the positive pole of rectifier diode and the other end of capacitor are connected on an end of gaseous discharge lamp operating current sampling winding, the other end of winding is connected with the cathode terminal of control element, and the rectifier diode negative pole also is connected to filtering capacitor.Winding is according to the size sampling of gaseous discharge lamp operating current like this, one the tunnel after signal and another road signal stack by capacitor of rectifier diode, send into the input of control element, the conducting of control element and the operating state of ending are controlled by the degree of this two-way superposed signal power, inverter operating frequency is changed automatically with the variation of gaseous discharge lamp operating current, cause " acoustic resonance " in the gaseous discharge lamp can not keep and go to pot, light output steadily.
Aging or the damage when gaseous discharge lamp, lamp holder sparking; during output short-circuit; electric current in the sampling winding increases or induced voltage increases; the signal of sending into the control element input is the strongest; the control element conducting; finally make in check power tube shutoff and acquisition protection in the inverter, the power rectifier circuit output is connected to by stream filter or active harmonics filter, makes the angle of flow increase of rectifier diode.
Advantage of the present invention is: controller is with the variation sampling of the operating current of high-voltage gas discharging light, acting on control element after the two paths of signals stack, change inverter operating frequency, eliminated " acoustic resonance " phenomenon effectively, and the operating current of control gaseous discharge lamp is no more than the design designated value.Inverter is quit work automatically, realize abnormal condition protection.Select for use by stream filter or active harmonics filter, power factor is improved.The present invention only establishes a half-bridge inverter, thereby simple in structure, with low cost.
Following table is the present invention and inductance type ballast and the performance table of comparisons that is used for the 100W high-pressure sodium lamp.
| Project name | The present invention | Inductive ballast |
| Supply voltage (V) | 220 | 220 |
| HID power (W) | 100 | 100 |
| Input current (A) | 0.46～0.50 | 1.20～1.40 |
| Input power (W) | 96～106 | 110～120 |
| Power factor (r) | 0.95～0.99 | 0.36～0.40 |
| Luminous flux (lm) | 8500 | 7000 |
| Start-up time | ≤5S | ≤3min |
| Restart the time | ≤3min | ≤10min |
| Temperature rise | ≤25℃ | ≤60℃ |
| Weight (kg) | ≤1.0 | ≤4.5 |
Now the invention will be further described in conjunction with the accompanying drawings.
Fig. 1 is an electronic circuit block diagram of the present invention;
Fig. 2 is the electrical schematic diagram of an embodiment of the present invention;
Fig. 3 is the silicon controlled electrical schematic diagram for controller T4 of the present invention;
The electrical schematic diagram that Fig. 4 is a triode for controller T4 of the present invention;
The electrical schematic diagram that Fig. 5 is an integrated circuit for controller T4 of the present invention;
Fig. 6 is the electrical schematic diagram of active harmonics filter for filter of the present invention.
The present invention is a kind of electric ballast of gaseous discharge lamp, be provided with power rectifier 1, filter 2, inverter 3, ballast inductance device 5, the output that it is characterized in that inverter 3 also is provided with controller 4, and it is connected in the current supply circuit of ballast inductor device 5, gas discharge lamp HID.An output of controller 4 is connected on the control utmost point of a power tube T2 of inverter 3.Controller 4 comprises B2, D14, D15, C9, C10, R9, R10 and T4, wherein the elementary winding N1 of B2 is connected in the current supply circuit of HID, the termination of secondary winding N2 is with reference to the ground end, the negative pole that the other end meets the positive pole of rectifier diode D14 and capacitor C10, D14 respectively connecting resistor R 9 and diac D15.The positive pole of capacitor C9 is connected with the negative pole of D14, the minus earth end of C9.The other end of D15 is connected with the input Sr of control element T4, and the output OUT of T4 is connected with the control utmost point of the power tube T2 of inverter 3, the D end ground connection of T4.The thermistor R8 of the two ends of capacitor C9 positive temperature coefficient in parallel, the secondary winding N2 two ends resistors in parallel R7 of B2.Fig. 1 is an electronic circuit block diagram of the present invention, and Fig. 2 is the electrical schematic diagram of an embodiment of the present invention.Be provided with the bridge rectifier that D1-4 constitutes among the figure in the power rectifier 1, ac input end is connected to fuse BX, and the common mode anti-interference filter is made of LO and C0.Filter 2 is one and pursues the stream filter, is provided with D5, D6, D7 by forward series connection, and its negative pole connects the positive output end of power rectifier 1, and positive pole connects with reference to ground and holds.Capacitor C1 is in parallel with D5, D6, and C2 is in parallel with D6, D7.Also be provided with delay circuit in the inverter 3, comprise triode T3, resistor R 3, R4 and capacitor C4.The collector electrode of T3 is connected on diac D9 and triggers on the common junction of capacitor C3 the grounded emitter end.R3 and C4 series connection, the collector electrode of last termination power tube T2, the base stage of following termination T3, R4 is connected in parallel on base stage and the emitter.
Operation principle is: the civil power of 50HZ is increased the angle of flow of D1-4 by what D5～7 and C1, C2 constituted by the stream filter circuit, to improve the power factor of ballast through common mode anti-interference filter LO and CO, D1-4 bridge rectifier.Power tube T1, T2 and pulse transformer B1 etc. constitute half-bridge inversion circuit, and R1, C3 and D9 are the circuits for triggering of inverter 3.D10, D11 are that protection T1, T2 are not punctured by rp pulse, and R2, C5 are the phase-shift networks of output high-frequency current, and D8 is a clamping diode.C6, C7 are HID lamp high-frequency work current paths, stopping direct current again.R5, R6 are the current-limiting resistors of power tube T1, T2 input, make work more stable.Ballast one energising, because the supply voltage of inverter 3 does not reach setting, for preventing that T1, T2 mutual conductance from leading to, so start moment positive supply charges to C4 by R1, D8 and the R2 R3 that flows through, charging current flow through T3 base stage, emitter,, make the T3 conducting, the C3 current potential is near zero, and diac is not worked.Through after 0.5～several seconds kinds, C4 is sufficient gradually, and the T3 trend is ended, and rises to 30V when above when C3 goes up terminal potential, the D9 conducting, and the power tube T2 conducting that is triggered, inverter is just started working, and realizes the purpose of delayed startup.Owing to be connected in parallel on condenser capacity C8≤C6 and C7 on the HID lamp, so the high-frequency current of inverter output.On C8, produce the resonance potential of thousands of volts, the breakdown starter of HID, operating current increases gradually, this moment inverter 3 operating frequency by height to low gradual change, in falling into HID lamp " acoustic resonance " frequency range, this moment, its operating current began to rise, the signal code of the secondary N2 output of the sampling transformer B2 that connects with current supply circuit also strengthens, one road D14 rectification of flowing through, convert direct current signal to by C9 filtering, through the R9 current limliting, breakdown when DC potential reaches the trigger voltage of diac D15, export a trigger impulse, send into the input Sr of control element T4; Another road also is admitted to the input of control element T4 simultaneously through the AC signal of C10 coupling and R10 current limliting.The conducting of T4 or the operating state of ending are controlled by the strong and weak degree of these two kinds of signals, and the operating frequency that makes inverter 3 changes with the operating current of HID and automatically along with change." acoustic resonance " can not be kept and go to pot, the electrode discharge arc stability of HID, because the speed of regulating from motion tracking is exceedingly fast, the light output of HID lamp is very stable.When temperature raise, the thermistor R8 resistance with positive temperature coefficient increased, and caused the current potential on the C9 to rise, and the breakdown number of times of D15 increases, and the T4 ON time increases, thereby has also controlled the power output of inverter 3.When the HID lamp is damaged, when output appearance open circuit or short circuit, all cause primary current increase or the pulse voltage of reaction of B2 to increase, the power tube T2 in the inverter 3 is turn-offed and the acquisition protection.The output signal of T4 is control T2's among Fig. 2, if the output reconfiguration of T4 to the T1 control end, the earth terminal of N2 and the D of T4 hold corresponding reconfiguration to the input signal of T1 and the common port of output signal at this moment, and the operating state of its controller is identical with effect.R9 and R10 can adjust the intensity of two path control signal respectively, have also just adjusted the working sensitivity of controller 4.
Fig. 3, Fig. 4, Fig. 5 are that the T4 in the controller 4 of the present invention is the electrical schematic diagram of controllable silicon, triode and integrated circuit.When control element T4 was controllable silicon, its output OUT was an anode, and input Sr is the control utmost point, and its D end is a negative electrode.T4 also can replace with triode, and its drain electrode, grid and source electrode are connected on the silicon controlled anode respectively, on the control utmost point and the corresponding contact of negative electrode.T4 can also select integrated circuit for use, and its output, input and earth terminal also are connected on respectively on silicon controlled anode, the control utmost point and the corresponding contact of negative electrode.Selected controllable silicon model is BD169, if the optional field effect transistor of using of triode, integrated circuit can be selected KW9002 and so on for use.Because during inverter 3 operate as normal, it in the control extremely of power tube T2 the pulse voltage of alternation, controllable silicon turn-offs when the HID operate as normal, in a single day abnormality appears in HID, controllable silicon is according to the intensity conducting of input two-way superposed signal or end, the operating frequency of control inverter and output current, so ballast can for a long time stable work, is no more than the design command value.
Sampling transformer B2 shown in Figure 2 makes freestandingly, and elementary N1 and secondary N2 are on a magnet ring; And B2 shown in Figure 3 be with ballast inductance device 5 in L1 be made of one, elementary winding is the L1 that establishes in it, secondary winding N2 is on L1.N2 among Fig. 4 is in the pulse transformer B1 of inverter 3, and the elementary winding N1 among the B2 is replaced by the elementary winding N0 among the B1 at this moment.The operation principle of these three kinds of structures is the same, all is to produce a signal code that is directly proportional with the HID operating current in N2.
The electrical schematic diagram that Fig. 6 is active harmonics filters for filter 2 of the present invention.It mainly is made of integrated circuit (IC), boost inductor L2, diode D16 and switch transistor T 5.The end of L2 is connected with the positive output end of power rectifier 1, and the other end is connected with the positive pole of D16, and the negative pole of D16 connects the positive supply input of inverter 3.The drain electrode of switch transistor T 5 is connected with the positive pole of D16, the source ground end, and grid is connected with the output of IC, and filtering capacitor C11 is connected in parallel on the output of filter 2.This filter circuit complexity, cost are slightly high, outstanding advantage be power factor than by stream filter height, reach more than 0.99 current wave crest ratio≤1.50, and that voltage is stablized is fabulous.
The power tube T1, the T2 that establish in the inverter 3 of the present invention are double pole triodes, also can be MOS-FET or IGBT, and it is corresponding one by one with source electrode with drain electrode, base stage and grid, emitter that its method of attachment is a collector electrode.The switching speed of MOS-FET is fast, does not have " second breakdown " phenomenon, and the same with IGBT have a negative temperature coefficient.Their operation principle is also close.
Claims (8)
1, a kind of electric ballast of gaseous discharge lamp, it is an electronic circuit that is contained in the housing, by power rectifier (1), filter (2), inverter (3), ballast inductance device (5) constitutes, the output that it is characterized in that described inverter (3), also be provided with controller (4) in the current supply circuit of gaseous discharge lamp (HID), a control element (T4) is equipped with in its inside, the control utmost point of a power tube in the output anode (OUT) of control element (T4) and the said inverter (3) is connected, the input and output public electrode of power tube is connected with negative electrode (D) end of control element (T4), the input control utmost point (Sr) of control element (T4) is connected to the series circuit and the capacitor (C10) of rectifier diode (D14) and diac (D15) respectively, the other end of the positive pole of rectifier diode (D14) and capacitor (C10) is connected on an end of gaseous discharge lamp (HID) operating current sampling winding (N2), the other end of winding (N2) is connected with negative electrode (D) end of control element (T4), the negative pole of rectifier diode (D14) also is connected to filtering capacitor (C9), winding (N2) is according to the size sampling of gaseous discharge lamp (HID) operating current like this, one the tunnel after signal and another road signal stack by capacitor (C10) of rectifier diode (D14), send into the input of control element (T4), control element (T4) conducting or the operating state of ending are controlled by the strong and weak degree of the superposed signal of this two-way, and the operating frequency of inverter (3) is changed automatically with the variation of gaseous discharge lamp (HID) operating current.
2, according to the electric ballast of the described gaseous discharge lamp of claim 1, it is characterized in that the control element of establishing in the described controller (4) (T4) is a controllable silicon, its output (OUT) is an anode, and input (Sr) is the control utmost point, and (D) end is a negative electrode; Control element (T4) also can replace with triode, and its drain electrode, grid and source electrode are connected on respectively on silicon controlled anode, the corresponding contact with negative electrode of the control utmost point; Control element (T4) can also be selected integrated circuit for use, and its output, input and earth terminal also are connected on respectively on silicon controlled anode, the control utmost point and the corresponding contact of negative electrode.
3, electric ballast according to claim 1 or 2 described gaseous discharge lamps, it is characterized in that the winding (N2) in the described controller (4) is on the inductance (L1) of ballast inductance device (5), also can be on the pulse transformer (B1) of inverter (3), can also be separately on a magnetic, other establishes an elementary winding (N1), constitute transformer (B2), elementary winding (N1) is to be connected in the current supply circuit of gaseous discharge lamp (HID), the operation principle of three kinds of connections is identical, all is to produce a signal code that is directly proportional with gaseous discharge lamp (HID) operating current in winding (N2).
4,, it is characterized in that the thermistor (R8) of capacitor (C9) the two ends positive temperature coefficient in parallel in the described controller (4) according to the electric ballast of claim 1 or 2 described gaseous discharge lamps.
5, according to the electric ballast of claim 1 or 2 described gaseous discharge lamps, it is characterized in that also being provided with delay circuit in the said inverter (3), wherein the collector electrode of triode (T3) is connected on diac (D9) and triggers on the common junction of capacitor (C3), the grounded emitter end, resistor (R3) and capacitor (C4) series connection, the collector electrode of last termination power tube (T2), the base stage of following termination triode (T3).
6, according to the electric ballast of the described gaseous discharge lamp of claim 1, it is characterized in that said filter (2) is one and pursues the stream filter, be provided with diode (D5), (D6), (D7) by forward series connection, its negative pole connects the positive output end of power rectifier (1), positive pole connects with reference to the ground end, capacitor (C1) and diode (D5), (D6) are in parallel, and capacitor (C2) and diode (D6), (D7) are in parallel, and the diode current flow angle in the power rectifier (1) is increased.
7, electric ballast according to the described gaseous discharge lamp of claim 1, it is characterized in that said filter (2) is an active harmonics filter, it is by integrated circuit (IC), boost inductor (L2), diode (D16) and switching tube (T5) constitute, one end of boost inductor (L2) is connected with the positive output end of power rectifier (1), the other end is connected with the positive pole of diode (D16), the negative pole of diode (D16) connects the positive supply input of inverter (3), the drain electrode of switching tube (T5) is connected with the positive pole of diode (D16), the source ground end, grid is connected with the output of integrated circuit (IC), and filtering capacitor (C11) is connected in parallel on the output of filter (2).
8, according to the electric ballast of the described gaseous discharge lamp of claim 1, it is characterized in that the power tube (T1) established in the said inverter (3) and (T2) be double pole triode, also can be MOS-FET or IGBT, it is corresponding one by one with source electrode with drain electrode, base stage and grid, emitter that its method of attachment is a collector electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96122931A CN1045515C (en) | 1996-10-06 | 1996-10-06 | Electronic ballast for high-strength gas discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96122931A CN1045515C (en) | 1996-10-06 | 1996-10-06 | Electronic ballast for high-strength gas discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1161630A CN1161630A (en) | 1997-10-08 |
| CN1045515C true CN1045515C (en) | 1999-10-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96122931A Expired - Fee Related CN1045515C (en) | 1996-10-06 | 1996-10-06 | Electronic ballast for high-strength gas discharge lamp |
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| Country | Link |
|---|---|
| CN (1) | CN1045515C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101115343B (en) * | 1999-06-21 | 2016-03-09 | 通达商业集团国际公司 | For fluid handling system ballast circuit and the method for electromagnetic radiation is provided within the system |
| CN100396164C (en) * | 2002-12-24 | 2008-06-18 | 常鹏 | Digital high-strength gas discharging light adapter |
| US7288901B1 (en) * | 2006-09-15 | 2007-10-30 | Osram Sylvania Inc. | Ballast with arc protection circuit |
| CN101321423B (en) * | 2008-07-10 | 2012-05-16 | 苏州金三元照明电器有限公司 | Road lamp electric ballast |
| CN101370343B (en) * | 2008-07-22 | 2012-12-19 | 朱其银 | High-frequency power supply type trigger |
| CN101351070B (en) * | 2008-08-26 | 2013-04-24 | 杭州电子科技大学 | Ballast circuit for high-intensity discharging lamp |
| CN104716941A (en) * | 2013-12-13 | 2015-06-17 | 上海普锐马电子有限公司 | High-frequency and high-voltage electronic switch with programmable control over conduction time |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133644A (en) * | 1983-01-14 | 1984-07-25 | Fuji Koeki Corp | Photographic flash apparatus |
| EP0398526A1 (en) * | 1989-04-28 | 1990-11-22 | Minnesota Mining And Manufacturing Company | Improved power supply circuit for a gaseous discharge tube device |
-
1996
- 1996-10-06 CN CN96122931A patent/CN1045515C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133644A (en) * | 1983-01-14 | 1984-07-25 | Fuji Koeki Corp | Photographic flash apparatus |
| EP0398526A1 (en) * | 1989-04-28 | 1990-11-22 | Minnesota Mining And Manufacturing Company | Improved power supply circuit for a gaseous discharge tube device |
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| Publication number | Publication date |
|---|---|
| CN1161630A (en) | 1997-10-08 |
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