CN1166772A

CN1166772A - Discharger of short-arc pulsed gas discharge lamp

Info

Publication number: CN1166772A
Application number: CN 96116369
Authority: CN
Inventors: 林文正; 卓美珍
Original assignee: Shanghai Institute of Optics and Fine Mechanics of CAS
Current assignee: Shanghai Institute of Optics and Fine Mechanics of CAS
Priority date: 1996-05-27
Filing date: 1996-05-27
Publication date: 1997-12-03
Anticipated expiration: 2016-05-27
Also published as: CN1047495C

Abstract

The discharger is mainly used in spherical pulse xenon lamp and other short-arc gas discharge light source. It contains charge and discharge loop connected to gas discharge lamp and pulse triggered charge and discharge loop. In the discharge loop, is connected serially several high voltage diodes or several assembly comprising high voltage diode and inductor, and the anode of discharge lamp passes through the center of coil connected to the cathode of discharge lamp. The discharger has simple structure, light weight, wide working voltage range, easy control, concentral light and easy forming of point light source and other features.

Description

Discharger of short-arc pulsed gas discharge lamp

The present invention relates to the electric discharge device of the short-arc pulsed gas discharge lamp that a kind of high-voltage pulse of short arc glow discharge spot lamp starts, be mainly used in the glow discharge spot lamp of spherical xenon flash lamp and other short arcs.

Prior art:

The existing electric discharge device that is used for the short arc glow discharge spot lamp roughly can be divided into three kinds:

1. the discharging structure of external trigger mode:

L.Waszak in the triggering mode of enumerating photoflash lamp in 1969 during in the design of discussing pulsed laser power supply first kind be the electric discharge device (as Fig. 1) of external trigger mode:

High voltage source 1 is charged to storage capacitor 3 by resistance 2, power supply 10 charges to electric capacity 7 by resistance 9, after controllable silicon 8 is triggered, electric capacity 7 is by elementary and controllable silicon 8 discharges of transformer 6, the secondary induction of transformer 6 go out high-voltage pulse make gaseous discharge lamp 5 breakdown potentials from, then electric capacity 3 to lamp 5 discharges, is finished once flash of light by inductance 4.This structure is simpler, uses extensively, but inapplicable to short-arc lamp, because the discharge arc column will form concurrent exhibition at random along lamp tube wall when lamp is breakdown, discharge can not concentrate between the two poles of the earth, can not form stable point-source of light (L.Waszak; Microwaves, 1969 (May), 8, No.5,130～138).

The series connection triggering mode discharging structure:

The electric discharge device of the another kind of photoflash lamp triggering mode of L.Waszak report, as Fig. 2, high voltage source 11 is charged to electric capacity 13 by resistance 12, power supply 19 charges to electric capacity 16 by resistance 18, after controllable silicon 17 is triggered, electric capacity 16 by controllable silicon 17, transformer 14 elementary discharge and secondarily level induce high-voltage pulse and make between two electrodes of photoflash lamp 15 and puncture, electric capacity 13 is secondary to lamp 15 discharges by transformer 14 just, forms once flash of light.The advantage of this structure is a reliable trigger, and arc energy concentrates in the middle of the two poles of the earth, but the secondary of transformer 14 will pass through big electric current, and the comparison heaviness that seems is so use not general.

3. the discharging structure of overvoltage triggering mode:

The third structure of L.Waszak report is with the not overvoltage triggering of belt switch, thereby very unstable, does not have practical value.U.S. EG﹠amp; The overvoltage that G company is recommended triggers as Fig. 3, and Practical significance is arranged.Among the figure, high voltage source 20 by resistance 21 to storage capacitor 22 charging and fill more tallerly than the puncture voltage of discharge lamp 24, gap 23 series connection that have trigger electrode insert discharge loop makes lamp not breakdown, and when behind the trigger electrode input trigger impulse of gap 23, gap puncture earlier causes gaseous discharge lamp simultaneously by over-voltage breakdown, trigger flashing.The shortcoming of this structure is that the discharging current of discharge lamp is very big, and shorten useful life, and simultaneously because charging voltage is very high, so the insulation difficulty is the also little practical (EG﹠amp of the structure of this device; GELECTRO-OPTICS, 1983,8).

The discharge of other triggering modes constitutes as the pre-ionization discharging structure, is still the differentiation of external trigger mode discharging structure in essence.

Purpose of the present invention:

When being used to trigger short-arc pulsed discharge lamp, prior art 1 can not make arc stability ground be between two electrodes and prior art 2 undue heavinesses for overcoming, prior art 3 is unfavorable for the shortcomings such as life-span of lamp, provide a kind of light and can make electrical discharge arc concentrate on electric discharge device between short-arc pulsed gas discharge lamp the two poles of the earth, with the flash of light controllability that improves short-arc pulsed gas discharge lamp, increase the service life and really bring into play the usefulness of short arc discharge lamp as point-source of light.

The structure of apparatus of the present invention such as Fig. 4, the anode of short-arc pulsed discharge lamp 28 passes the center of coil 29, coil 29 is connected on the negative electrode of discharge lamp 28, assembly 26 with big Opposed crossing impedance is sealed in the discharge loop between the gaseous discharge lamp 28 and capacitor 27, high voltage source 35 is charged to electric capacity 32 by resistance 34, when controllable silicon 33 is touched out, electric capacity 32 just passes through the elementary discharge of controllable silicon 33 and high voltage pulse transformer 31, constituted the pulse-triggered charging and discharging circuit, the secondary induction of its transformer 31 goes out high-voltage pulse, by high-voltage capacitor 30 lamp 28 is punctured, the storage capacitor 27 that is charged by high voltage source 25 just discharges to lamp 28 by assembly 26, forms flash of light.The effect of assembly 26 is to allow the forward high pressure passes through by stoping the reverse impulse high pressure on the capacitor, and it is breakdown that discharge lamp 28 is easy to.The effect of coil 29 is to change the Electric Field Distribution between the lamp 28 anode negative electrodes, thereby reduces puncture voltage.The effect of capacitor 27 is to store discharge energy, and lamp 28 is to use as point-source of light, and is luminous when it discharges at electric capacity 27, light energy output.The effect of high-voltage capacitance 30 is to allow high voltage pulse pass through to stop the secondary discharge of electric capacity 27 to pulse transformer 31.Power supply 35 provides trigger impulse voltage and charges by the storage capacitor 32 of resistance 34 to trigger element, 33 discharges of controllable silicon trigger switch is used, its conducting under small-signal triggers, make electric energy on the electric capacity 32 to the elementary discharge of high voltage pulse transformer 31, the effect of high voltage pulse transformer 31 is that primary voltage is increased to more than the 15kV so that puncture short-arc pulsed discharge lamp, realizes triggering starting flash of light.

The structure of assembly 26 can have the structure of various ways, and wherein commonly used is:

(1) is composed in series by a plurality of high-voltage diodes 261,262,263, as shown in Figure 5.

(2) be composed in series by a plurality of high-voltage diode 264,265,266 coilloadings 267, as shown in Figure 6.

Advantage of the present invention:

(1) simple in structure, light:

Compare with prior art (2), save heavy series transformer, only need a high-voltage capacitance 30 and assembly 26, and assembly 26 also is very light.

(2) can guarantee to discharge and take place, make luminous concentrating, form point-source of light, with parts coupling efficiency height such as optical fiber in two interpolar centres of short-arc pulsed discharge lamp.

(3) can guarantee that short-arc pulsed discharge lamp has long useful life.Because triggering mode is to puncture, and the firing voltage of short-arc pulsed discharge lamp is descended greatly, so discharge lamp can be operated in low-voltage state, avoids too high peak current, prolong the life-span of discharge lamp in lamp.The operating voltage range of short arc discharge lamp also increases greatly simultaneously, and controllability strengthens.

Description of drawings:

Fig. 1 is the external trigger mode discharge circuit structural representation of prior art 1.

Fig. 2 is the series connection triggering mode discharge circuit structural representation of prior art 2.

Fig. 3 is the overvoltage triggering mode discharge circuit structural representation of prior art 3.

The electrical block diagram of Fig. 4 gaseous discharge lamp electric discharge device of the present invention.

Fig. 5 is first kind of structure of assembly 26 of the present invention.

Fig. 6 is second kind of structure of assembly 26 of the present invention.

Fig. 7 is the circuit diagram of electric discharge device embodiment of the present invention.

Embodiment:

Assembly 26 adopts second kind of structure, the embodiment detailed circuit diagram is seen Fig. 7, gaseous discharge lamp is an xenon flash lamp 28, when switch 47 closures, the 220V alternating current adds to the elementary of low-tension transformer 49 through fusible link 48, it is secondary two windings, and one group of output 400V voltage is added to the high voltage source 35 output 560V direct voltages that the full-wave rectifying circuit is made up of rectifier diode 351,352,353,354 constitutes and charges to electric capacity 32 by current-limiting resistance 34.When controllable silicon 33 is triggered, voltage on the electric capacity is by controllable silicon 33 and high voltage pulse transformer 31 (elementary 20 circles, secondary 600 circles, iron gold oxygen magnetic core) elementary discharge also goes out the high voltage pulse of 15kV at secondary induction, this high pressure is added to the anode of short-arc pulsed xenon lamp 28 through high-voltage capacitor 30, under the effect of coil 29, lamp 28 breakdown discharges.At this moment, if be filled with voltage on the storage capacitor 27, will cause flash of light.And the charge and discharge process of capacitor 27 is as follows: when high-voltage switch gear 38 closes, high-voltage relay 39 closes, the 220V alternating voltage just enters the elementary of high-tension transformer 40 through the joint 37 of often opening of fusible link 36 and relay 39, secondaryly will produce ac high-voltage, the DC high-voltage power supply 25 that behind the rectifier bridge that diode 251,252,253,254 is formed, becomes and through current-limiting resistance 41 to storage capacitor 27 chargings.Form peak voltmeter in order to the voltage on the indication electric capacity 27 by diode 43 and electric capacity 44, resistance 45, microammeter 46.The discharge process of electric capacity 27 is as follows: the assembly 26 that controllable silicon 42 is touched out when short-arc pulsed discharge lamp 28 is punctured by above-mentioned high-voltage pulse, voltage just is made of diode 264,265,266 and coil 267 (being that the iron gold oxygen magnetic core of 15mm * 15mm is suitable for reading in the cross section makes around 50 circles with φ 2mm enamelled wire) through controllable silicon 42 on the electric capacity 27 forms and glistens to xenon lamp 28 discharges.

The rectifier bridge that the 15V alternating current of another group winding output of low-tension transformer 49 is formed through diode 50,51,52,53 becomes direct voltage again and by three end integrated stable voltage circuits 55 it is stable at 15V output again behind filter capacitor 54, supply with pulse generator and amplifier after the filtering once more through electric capacity 56.Pulse generator is made up of not gate 57,58 and resistance 59,60, electric capacity 61.Remove to trigger controllable silicon 69 from resistance 66 output spikes and through coupling capacitance 67 behind the compound amplifying stage of output square-wave voltage through being added to triode 63,64 compositions behind electric capacity 62 and resistance 65 differential, at this moment formerly be charged to the just elementary discharge by controllable silicon 69 and pulse transformer 71 and go out pulse voltage of voltage on the electric capacity 70 at the secondary induction of pulse transformer through resistance 68, wherein one the tunnel through diode 72,73 and electric capacity 74 form get positive signal and anti-jamming circuit after be added to the gate pole of controllable silicon 33 with the trigger impulse high pressure.Another road through diode 75,76 and electric capacity 77 form get positive signal and anti-jamming circuit after trigger controllable silicon 42 again and cause flash of light.The energy of flash of light is by the capacity and the charging voltage decision of capacitor 27, and the frequency of flash of light is by the square wave frequency decision of oscillator output.

Claims

1. discharger of short-arc pulsed gas discharge lamp, contain by power supply (25) and electric capacity (27) and constitute charging and discharging circuit gaseous discharge lamp (28), pulse-triggered charging and discharging circuit by the primary side of high voltage source (35), resistance (34), electric capacity (32), controllable silicon (33) and high voltage pulse transformer (31) constitutes is characterized in that the anode of gaseous discharge lamp (28) passes the center of a coil (29); Coil (29) links to each other with the negative electrode of gaseous discharge lamp (28); In discharge loop, be in series with assembly (26) between gaseous discharge lamp (28) and the capacitor (27); The anode of gaseous discharge lamp (28) is connected in the secondary end of high voltage pulse transformer (31) by high-voltage capacitor (30).

2. according to the described a kind of gaseous discharge lamp electric discharge device of claim 1, it is characterized in that assembly (26) is made of a plurality of high-voltage diodes (261), (262), (263) series connection; Or by a plurality of high-voltage diodes (264), (265), (266) and inductance (267) series connection formation.