EP3016480A2 - Alimentation électrique sans allumeur pour lampes au xénon dans un appareil de test de vieillissement accéléré - Google Patents

Alimentation électrique sans allumeur pour lampes au xénon dans un appareil de test de vieillissement accéléré Download PDF

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Publication number
EP3016480A2
EP3016480A2 EP15188134.9A EP15188134A EP3016480A2 EP 3016480 A2 EP3016480 A2 EP 3016480A2 EP 15188134 A EP15188134 A EP 15188134A EP 3016480 A2 EP3016480 A2 EP 3016480A2
Authority
EP
European Patent Office
Prior art keywords
electrodes
casing
lamp
strip
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15188134.9A
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German (de)
English (en)
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EP3016480A3 (fr
Inventor
Michael Bandel
Gregory Mirsky
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Atlas Material Testing Technology LLC
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Atlas Material Testing Technology LLC
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Filing date
Publication date
Priority claimed from US14/505,118 external-priority patent/US20150015141A1/en
Application filed by Atlas Material Testing Technology LLC filed Critical Atlas Material Testing Technology LLC
Publication of EP3016480A2 publication Critical patent/EP3016480A2/fr
Publication of EP3016480A3 publication Critical patent/EP3016480A3/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
    • H05B41/2883—Load circuits; Control thereof the control resulting from an action on the static converter the controlled element being a DC/AC converter in the final stage, e.g. by harmonic mode starting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/16—Selection of substances for gas fillings; Specified operating pressure or temperature having helium, argon, neon, krypton, or xenon as the principle constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/84—Lamps with discharge constricted by high pressure
    • H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase

Definitions

  • the present disclosure is related to power supplies for supplying power to a lamp in a weathering apparatus.
  • the weathering device is used to simulate prolonged exposure to environmental elements.
  • One such environmental element is sunlight.
  • a weathering apparatus may use a high intensity lamp such as a xenon lamp.
  • the present disclosure is related to a device to supply a xenon lamp with an irradiance spectrum shaped high-frequency sinusoidal current at minimum loss in order to control a radiated spectrum from such lamp and to using waveform shaping to manipulate the switching mode output voltage and current for obtaining a controllable xenon lamp radiated spectrum.
  • the xenon lamp radiation spectrum is more precisely controlled during weathering tests in order to better simulate solar radiation, as well as improve xenon lamp output in the ultraviolet part of the radiated spectrum and reduce unwanted radiation in the infrared part of the spectrum.
  • the system of the present disclosure further includes an ignition assisting reservoir of energy provided during pre-ignition phase of the lamp such that the lamp requires a less powerful igniter.
  • One known conventional device uses a pulsed DC mode of the xenon lamp operation, which is merely a modulation of the duty-cycle. Such a device is disadvantageous because it generates very high current abrupt surges that can destroy the cathode and reduce the life of the xenon lamp. Additionally, this conventional method does not accurately simulate the sun daily cycle.
  • arc lighting AC output electronic power supplies for high intensity discharge lamps only regulated the current and/or power to the lamp. Additionally, limited lamp dimming was provided by allowing for control to reduce the magnitude of the lamp current. Typically, they were three stage power supplies consisting of a power factor corrector, a buck converter, and a low frequency AC inverter. They also required a separate igniter whose power was comparable to the whole power supply rated power to start the lamp. Irradiance control was non-existent, so as to not be considered.
  • devices that utilize gas discharge lamps with known power supplies require systems that can deliver a significant pulse of energy during ignition of the lamp.
  • the current control mechanisms of known power supplies can result in abrupt surges or spikes in current that can negatively impact the reliability and life of the gas discharge lamp. Therefore, improved power supplies are needed to provide ignition systems with lower power requirements such that operating costs of the device are reduced and the flexibility for choice of igniters is improved.
  • one aspect of the present disclosure may include an accelerated weathering apparatus that may include a power supply that can control both the xenon lamp radiated spectrum and its intensity in order to fully simulate the sun's daily cycle, improve the ultraviolet output, and reduce the infrared radiation.
  • a power supply may include a high frequency inverter for obtaining a controllable, waveform defined, output power being supplied to a xenon lamp. This provides the ability to develop a spectrum shaped lamp irradiance, a resonant circuit as a current source for a direct xenon lamp supply, and at the same time, a high-power, high voltage, xenon lamp backup for reliable arc initiation and setting at lower ignition voltage with a less powerful igniter.
  • the embodiment may be more compact and less expensive due to use of high frequency power conversion technology and waveform manipulation, as well as have an ability to be computer monitored and controlled locally and/or remotely, even via the internet.
  • Another aspect of the present disclosure may include an accelerated weathering device that may include using a near resonant high frequency switching to create a lamp pre-ignition condition that can be advantageously configured to assist in lamp ignition.
  • the size and energy requirements of known igniters may be reduced using aspects of the present disclosure as well as using other previously considered impractical methods of lamp ignition due to the back-up of high voltage and stored energy of some embodiments.
  • the present disclosure allows for increased flexibility when choosing ignition type with potential for lower costs and increased operating life.
  • a power supply includes a spectrum shaping component that is capable of providing a signal that controls the irradiance spectrum of a lamp.
  • a power supply in another aspect of the present disclosure, includes a pre-conditioning component that supplies a lamp with a high voltage and a reservoir of back-up energy to assist in the ignition and operation of the lamp.
  • a weathering device in yet another aspect of the present disclosure, includes a power supply that is able to control the irradiance spectrum of a lamp such that it simulates the sun's daily cycle.
  • a weathering device in one embodiment, includes a system for generating simulated sunlight as shown in Figure 9 .
  • the system for generating simulated sunlight is located inside weathering device (82) within housing (90) and is operative to interact with test samples located on rack (92).
  • the system for generating simulated sunlight can interact with many different weathering or testing apparatuses such as the embodiment shown in Figure 8 or the weathering testing systems disclosed in U.S. Patent Numbers 4,957,011 , 5,226,318 , or 5,503,032 , the contents of which are incorporated herein by reference.
  • the example system for generating simulated sunlight includes power supply (86) and lamp (10).
  • the lamp (10) is a xenon lamp oriented vertically within rack (92) of weathering device (82).
  • power supply (86) is located inside of weathering device (82) but outside rack (92) and the test chamber in order to be protected from the elements that are subjected to the test samples within the weathering device.
  • Lamp (10) in this example, is a xenon lamp.
  • gas discharge lamps can be used with the present disclosure including the embodiments of power supply (86) described herein.
  • a xenon lamp is useful in the presently disclosed context for a xenon lamp's ability to simulate sunlight.
  • Other lamps may be used with the teachings of the present disclosure regarding the ignition of and irradiance spectrum shaping of other gas discharge lamps.
  • Figure 1 shows an embodiment of power supply (86).
  • the basic concept is a waveform shaped output, obtained through a pulse-width modulation of a high frequency, switching mode inverter power supply for AC Xenon powered lamps that allows for enriching the output current spectrum with low frequency, (with respect to the high frequency) components.
  • the device may be treated as a class D amplifier.
  • the 3-phase AC mains drives a power factor corrector (1) that is capable of operating over a very wide input voltage range while maintaining a high power factor and low current total harmonic distortion.
  • the power factor corrector (1) supplies output power to a phase-shifted full bridge inverter (2) in the form of DC voltage and current.
  • the phase-shifted full bridge inverter (2) receives power from the power factor corrector (1) and signal control from the feedback control circuit (6). It delivers power to the main transformer (3) via primary winding (4).
  • the primary winding (4) of main transformer (3) loads the phase-shifted full-bridge inverter (2).
  • a main secondary winding (8) transfers power to the series resonant circuit (9).
  • An additional secondary winding (5) is a voltage feedback signal source to the feedback control circuit (6) to sense the status of power being transferred through the main transformer (3) and provide for necessary control.
  • the feedback control circuit (6) signals the phase-shifted full-bridge inverter (2), providing the necessary information for output control and regulation of the full system output power.
  • the feedback control circuit (6) is also signaled by the spectrum shaping circuit (7).
  • the feedback control circuit (6) senses voltage via the main transformer (3) secondary winding (5) and current sense circuit (17).
  • the spectrum shaping circuit (7) signals a specific waveform construction to the feedback control circuit (6), and, it allows for user input control of the feedback loop current by providing for selection of, and where required, additional output spectrum shaping can occur.
  • the series resonant circuit (9) transfers power to the xenon lamp (10) during normal operation and provides current stabilization. It also initiates energy support for the pulse igniter (16) through the igniter transformer secondary windings (14) and (15) by creating a base voltage across the xenon lamp (10) to help start the lamp and provide sustaining energy once an ignition arc is established.
  • Series resonant circuit (9) couples to xenon lamp (10) through igniter transformer (11), secondary windings (14) and (15) and current sense circuit (17).
  • the primary windings (12) and (13) of igniter transformer (11) are driven by the pulse igniter (16), which is signaled by the unloaded series resonant circuit (9) during the pre-ignition and ignition phases of lamp start-up.
  • the pulse igniter (16) pulses the igniter transformer (11) primary windings (12) and (13) to create a high enough voltage on the igniter transformer (11) secondary windings (14) and (15) to ignite the lamp by inducing an alternating current arc to flow between lamp cathodes.
  • the pulse igniter (16) is fed from the power factor corrector (1) output for the best stability. Secondary windings (14) and (15) may be wound such that the starting points do not impose additional impedance on lamp (10) current development but produce high differential voltage across lamp (1) when pulse igniter (16) starts.
  • Current sense circuit (17) is a circuit configured to supply a feedback signal to feedback control circuit (6) that indicates the state of lamp (10) such that the power supply can manage or correct the power output through phase-shifted full bridge inverter (2).
  • Current sense circuit (17) as shown in Figure 1 in one embodiment is in series between the igniter transformer (11) secondary windings (14) and (15) and series resonant circuit (9).
  • current sense circuit may include photo-sensor (24) connected to the photo-receiver (26), which in turn is connected to the feedback control circuit (6) and can assist in irradiance stabilization and aging compensation as well as assist in irradiance spectrum shaping.
  • a current sensor can be used assist to adjust, monitor, or control the voltage and the current.
  • the modulation of current in power supply (86) can be accomplished via various methods to accomplish the irradiance spectrum shaping of the present disclosure.
  • One embodiment of the power supply output control is shown in Figure 10 .
  • error amplifier (104) compares the output voltage/current to the reference signal and controls the converter (102) such that the output voltage/current is modified to take a predetermined shape such that lamp (10) produces a predetermined and reproducible irradiance spectrum.
  • FIG 11 shows another embodiment of the power supply output control.
  • a modulated signal is introduced in the feedback loop through resistor (108).
  • the reference signal at error amplifier (104) remains intact and the modulated signal can control the output current/voltage through converter (102).
  • the output signal can be varied so that the current at lamp (10) can be much higher than the RMS value and at other times, much lower.
  • the irradiance spectrum output of lamp (10) can be varied to increase UV output and suppress infrared output.
  • Figure 8 is a chart showing an example irradiance output of lamp (10) when used in conjunction with one example power supply of the present disclosure. As shown and referenced above, the portion of the irradiance spectrum in the UV portion of the spectrum is increased while the portion in the infrared portion of the spectrum is reduced.
  • the power supply includes an ignition system with ignition assistance and an igniter element.
  • ignition assistance includes series resonant circuit (9).
  • series resonant circuit (9) develops a reservoir of back-up energy that is available to lamp (10) such that a less powerful igniter is required for ignition of lamp (10).
  • the xenon lamp (10) may be connected to its output to ignite and run as desired.
  • a pre-ignition phase when the xenon lamp (10) is still cold and does not present any load to the series resonant circuit (9). This is when the voltage across the xenon lamp (10) runs up to a magnitude of a few kilovolts, allowing pre-ionization streamers to form and begin to lower the very high impedance of the lamp.
  • the arc in the xenon lamp (10) establishes itself by means of a high voltage pulse from the pulse igniter (16) coupled through the igniter transformer (11) to the xenon lamp (10). Once an arc occurs, the lamp impedance is abruptly reduced and there is no longer a need for an ignition pulse from the pulse igniter (16).
  • the xenon lamp (10) now shunts the energy of the series resonant circuit (9) through the igniter transformer (11) secondary windings (14) and (15) sustaining the ignition arc, reducing output voltage to that normally required for the lamp, and setting up constant lamp current.
  • the main factors in the determination of current magnitude through the xenon lamp (10) are the output voltage and frequency delivered by the secondary winding (8) of the main transformer (3), the inductor and capacitor elements, (not shown, but known to one of ordinary skill in the art) that determine the tuned frequency of the series resonant circuit (9), and inductance value of the inductor element in the series resonant circuit (9).
  • the spectrum shaping circuit (7) may be used to adjust irradiance spectrum of the xenon lamp (10) as determined by setting selection via user input. This is performed by using a waveform generator within spectrum shaping circuit (7) to act upon the feedback signaling through the feedback control circuit (6) and adjust or shape the xenon lamp (10) output current envelope.
  • the lamp irradiance spectrum control is now governed by controlling the shape of the overall current envelope flowing through the xenon lamp (10). Therefore, by changing or trimming the shape of the signal waveform generated in the spectrum shaping circuit (7) one can adjust the xenon lamp (10) irradiance spectrum to a desired one or within a desired range.
  • the irradiance spectrum variation during this adjustment can be monitored and verified by means of a spectroradiometer or spectrum analyzer of appropriate range.
  • the ignition system includes high voltage (HV) wire (18) which is driven from a low power, high voltage igniter.
  • HV high voltage
  • the xenon lamp (10) is coupled through the current sense circuit (17) back to the series resonant circuit (9).
  • High voltage igniter (22) is also referenced by connection to the bottom of the xenon lamp (10), receives signal from the power factor corrector (1), and is designed to generate a high voltage on HV wire (18) that is synchronized to occur at a point within the excitation envelope of the resonant circuit (9) during the transfer from pre-ignition to lamp ignition.
  • HV wire (18) can be a thin nickel wire wound at a very large pitch around the lamp.
  • the ignition system includes electrostatic arc terminals (19) driven by arc igniter (30).
  • the power factor corrector (1) signals arc igniter (30) and the xenon lamp (10) current is strictly coupled through the current sense circuit (17) back to the series resonant circuit (9) without any lamp reference connection required for arc igniter (30).
  • the ignition is initiated through electrostatic discharge with the lamp between the arc terminals (19).
  • the ignition system includes a UV radiation source (20) directed at the lamp.
  • the power factor corrector (1) signals UV igniter (40) and the xenon lamp (10) is excited by UV radiation source (20) emitted by UV igniter (40).
  • the mechanism here is to apply energy in the form of UV radiation to excite the xenon lamp (10) such that the few kilovolts expressed across the xenon lamp (10) by the series resonant circuit (9) during pre-ignition becomes sufficient to ignite the lamp.
  • UV ignition is accomplished by a short-time pulse of UV radiation applied to the lamp (10) from an external source.
  • Example sources of UV radiation include a UV laser, a compact UV-VIS fiber light source or other suitable UV sources.
  • FIG. 7 shows one example of the voltage profile generated during the pre-ignition phase of operation.
  • the voltage across lamp (10) can run in the magnitude of a few kilovolts.
  • Ignition of lamp (10) using any of the embodiments of the power supply can be operated using the flowchart shown in Figure 6 . Once ignition is achieved, lamp (10) can be operated to achieve the irradiance spectrum desired by the
  • a lamp and power supply are configured to function without the use of a separate igniter but otherwise function in accordance with the teachings of the remainder of this disclosure.
  • the lamp includes an ignition aid which enables the lamp to ignite at a lower voltage.
  • Figure 12 depicts a cross section of a lamp in accordance with an embodiment of the present disclosure.
  • the lamp 1200 may be a long arc lamp comprising two electrodes 1202a, 1202b surrounded by an envelope 1204.
  • the electrodes 1202a, 1202b may be similar to the arc terminals (19) discussed above.
  • the central portion of the envelop 1204 may be substantially cylindrical.
  • the lamp is a long arc xenon burner.
  • the envelope 1204 comprises an optically clear material such as glass or crystal.
  • the envelope 1204 may be hermatically sealed around the electrodes 1202a, 1202b.
  • the interior 1206 of the envelope 1204, including the space between the electrodes 1202a, 1202b, may be filled with a gas, such as xenon.
  • the lamp 1200 includes an ignition aid comprising one or more plates.
  • Plate 1208a is disposed on the exterior of the envelope 1204 proximate one electrode 1202a. As shown, the plate 1208a may comprise a ring which encircles the envelope 1204.
  • a second plate 1208b is located on the exterior surface of the envelope 1204 proximate the other electrode 1202b.
  • the two plates 1208a, 1208b are electrically connected together, for example through a wire 1210 or a conductive strip running longitudinally along the exterior surface of the envelope 1204.
  • the plates 1208a, 1208b and wire 1210 are applied to the envelope 1204 using metal deposition.
  • the plates 1208a, 1208b and wire 1210 are attached using spring clips.
  • the plates 1208a, 1208b and wire 1210 are formed from a single conductive strip.
  • the material comprising the envelope 1204 is selected so as to filter the light emitted by the lamp.
  • the material may block a portion of the light in the ultra-violet or infra-red spectrum so as to cause the light emitted from the lamp 1200 to have a desired spectrum.
  • FIG. 13 depicts an embodiment of a lamp 1300. As shown, the plates 1208a, 1208b completely encircle the envelope 1204. The plates are joined by a conductive strip 1302.
  • FIG. 14 depicts an embodiment of a lamp 1400 in which a single conductive strip 1402 is located on the exterior surface of the envelope 1204 such that each end is proximate one of the electrodes 1202a, 1202b.
  • multiple conductive strips are located on the envelop 1204 such that each strip is electrically isolated from every other strip.
  • two conductive strips may be arranged on opposite sides of the envelope 1204.
  • three or more conductive strips may be arranged equidistant from one another on the envelope 1204.
  • any number of conductive strips equally spaced about the perimeter of the envelope 1204 may also be so arranged.
  • FIG. 15 depicts an embodiment of a lamp 1500 in which the plates 1402a, 1402b extend less than halfway around the envelope 1204.
  • the plates 1502a, 1502b are joined by a conductive strip 1504.
  • the conductive strip may encircle less than 25% of the circumference of the envelope 1204.
  • plates 1502a, 1502b form one pair of plates. Additional pairs of plates may be located around the envelop 1204 such that each pair of plates is electrically isolated from every other pair of plates.
  • Each pair of plates is joined by a conductive strip, similar to conductive strip 1504.
  • the pairs of plates are arranged equidistant from one another around the envelope 1204.
  • FIG. 16 depicts a circuit diagram wherein the lamp 1200 is connected to a power supply as described herein such that the lamp 1200 is in parallel with the resonant capacitor 1602 in the series resonant circuit (9) and is in series with the resonant inductor 1602.
  • the first electrode 1202a is electrically connected to one plate of the resonant capacitor 1602
  • the second electrode 1202b is electrically connected to the other plate of the resonant capacitor 1602.
  • a high frequency alternating current is applied to the lamp 1200, at or near the resonance frequency of the resonant circuit (9).
  • the plate 1208a acts as a capacitor with the first electrode 1202a
  • the second plate 1208b acts as a capacitor with the second electrode 1202b.
  • the plates 1208a, 1208b act as two capacitors in series with the lamp.
  • the voltage between one of the electrodes 1202a, 1202b and the corresponding plate 1208a, 1208b exceeds the breakdown voltage of the gas in the volume 1206 inside the envelope 1204, the gas breaks down through electrostatic discharge between the respective electrode 1202a, 1202b and plate 1208a, 1208b forming plasma.
  • the voltage across the electrodes 1202a, 1202b quickly causes the plasma to propagate throughout the volume 1206, thereby igniting the lamp.
  • the breakdown voltage of the gas in the volume is dictated by Paschen's Law, which states that the breakdown voltage of a gas between two terminals depends upon the distance between the terminals and the pressure of the gas. Accordingly, as the distance between each electrode 1202a, 1202b and the corresponding plate 1208a, 1208b is significantly less than the distance between the electrodes 1202a, 1202b, the ignition voltage of the lamp 1200 is significantly reduced from that required for a standard gas discharge lamp.
  • FIG. 17 depicts the voltage applied across the electrodes 1202a, 1202b during ignition and at regular operation. As shown, the alternating voltage is gradually increased until the lamp ignites.
  • the plates 1202a, 1202b are configured such that the lamp 1200 ignites around 3.5kV. After the lamp ignites, the voltage is reduced to that used during normal operation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP15188134.9A 2014-10-02 2015-10-02 Alimentation électrique sans allumeur pour lampes au xénon dans un appareil de test de vieillissement accéléré Withdrawn EP3016480A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14/505,118 US20150015141A1 (en) 2011-11-17 2014-10-02 Igniter-less power supply for xenon lamps in an accelerated weathering test apparatus

Publications (2)

Publication Number Publication Date
EP3016480A2 true EP3016480A2 (fr) 2016-05-04
EP3016480A3 EP3016480A3 (fr) 2016-07-06

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EP15188134.9A Withdrawn EP3016480A3 (fr) 2014-10-02 2015-10-02 Alimentation électrique sans allumeur pour lampes au xénon dans un appareil de test de vieillissement accéléré

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EP (1) EP3016480A3 (fr)
JP (1) JP2016075679A (fr)
CN (1) CN105491771A (fr)
CA (1) CA2907169A1 (fr)

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RU2784020C1 (ru) * 2022-04-29 2022-11-23 Общество С Ограниченной Ответственностью "Научно-Производственное Предприятие "Мелитта" (Ооо "Нпп "Мелитта") Способ генерации высокоинтенсивных импульсов УФ-излучения сплошного спектра и устройство для его осуществления

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CN108020497A (zh) * 2016-11-01 2018-05-11 江苏秀强玻璃工艺股份有限公司 一种基于氙气光源的老化试验检测设备及其使用方法
KR101883490B1 (ko) * 2016-12-27 2018-08-30 코오롱글로텍주식회사 초촉진식 광열화 시험방법
WO2020217284A1 (fr) * 2019-04-22 2020-10-29 スガ試験機株式会社 Machine d'esssai de résistance aux intempéries
CN112055439B (zh) * 2020-09-14 2022-04-05 孝感瑞奕照明有限责任公司 一种智能高效大功率高压气体灯电源管理装置

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