EP0563716A1 - Dispositif à lampe UV - Google Patents

Dispositif à lampe UV Download PDF

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Publication number
EP0563716A1
EP0563716A1 EP93104607A EP93104607A EP0563716A1 EP 0563716 A1 EP0563716 A1 EP 0563716A1 EP 93104607 A EP93104607 A EP 93104607A EP 93104607 A EP93104607 A EP 93104607A EP 0563716 A1 EP0563716 A1 EP 0563716A1
Authority
EP
European Patent Office
Prior art keywords
lamp
transformer
stray field
arrangement according
power
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.)
Granted
Application number
EP93104607A
Other languages
German (de)
English (en)
Other versions
EP0563716B1 (fr
Inventor
Manfred Diez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OTTO DIEZ ELEKTROMASCHINENBAU
Original Assignee
OTTO DIEZ ELEKTROMASCHINENBAU
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by OTTO DIEZ ELEKTROMASCHINENBAU filed Critical OTTO DIEZ ELEKTROMASCHINENBAU
Publication of EP0563716A1 publication Critical patent/EP0563716A1/fr
Application granted granted Critical
Publication of EP0563716B1 publication Critical patent/EP0563716B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3922—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations and measurement of the incident light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge lamps
    • 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
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3924—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by phase control, e.g. using a triac

Definitions

  • the invention relates to an arrangement with a UV lamp.
  • Such arrangements are mainly used for drying e.g. for drying paints that can be hardened by UV light.
  • they are equally suitable, for example, for water treatment by ozone formation, or for the detoxification of contaminated soils.
  • transducers In such applications, there is often a requirement that the power emitted by the UV lamp should be adjustable or controllable within the broadest possible limits.
  • transducers have hitherto been used which are arranged on the secondary side of a transformer which supplies the lamp with electrical energy. These transducers are very safe to operate, but are complex, in particular due to the control elements required for them, and they only allow a power adjustment in a not too large area.
  • This arrangement uses the normal mains frequency of 50 Hz to supply the UV lamp with electrical power.
  • it uses special firing pulses "of about 100 Hz to ignite the lamp" when the lamp power is reduced more. This enables the lamp output to be reduced to very low values, but requires an additional ignition arrangement with a higher operating frequency, which must be switched on at least if the output of the lamp is to be reduced more.
  • this object is achieved by an arrangement with a UV lamp, with adjustable output power, with a semiconductor control device for influencing the electrical energy supplied to the UV lamp by means of phase control both the positive and the negative half-waves, and with a stray field transformer connected between the semiconductor control device and the UV lamp for supplying an ignition voltage or - after ignition - a burning voltage for the UV lamp which is reduced compared to the ignition voltage, which stray field transformer has a transformer core constructed from sheet metal, the iron volume of which is increased by approximately 25% or more in comparison to that of a stray field transformer for the same UV lamp, but without a semiconductor control device - hereinafter referred to as the normal size.
  • the phase angle control delivers a new pulse at low power
  • the magnetic energy stored in the stray field transformer is already largely used up, i.e. the stray field transformer is in a state which is not unlike that when it was first switched on, and the magnetic flux density in it is essentially zero.
  • the stray field transformer then briefly delivers a very high ignition voltage each time a new pulse of the phase angle control, and this helps to keep the gas in the UV lamp ionized even when the power is greatly reduced and to ensure that this lamp is also at a greatly reduced level Performance continues to burn and does not go out.
  • the arrangement according to the invention is also designed such that the iron volume of the stray field transformer is increased by 30 ... 50% and in particular by 30 ... 40% compared to the normal size. It is thus possible to obtain a large adjustment or control range for the lamp output.
  • the arrangement according to the invention is developed with particular advantage such that a regulating device is provided for regulating the current supplied to the lamp. It has been shown that stable operation of the lamp with a sufficiently high voltage can be made possible in this way, especially when the lamp power is greatly reduced.
  • the arrangement is preferably designed according to claim 4, with the particular advantage that a simpler structure of the arrangement is possible on the primary side due to the much lower voltage there.
  • optimal operation is possible with a subordinate current control.
  • the setpoint for this control can either be specified manually or by a higher-level control that regulates the power output of the UV lamp.
  • the arrangement according to the invention is developed so that the stray field transformer is designed for a magnetic flux density in the transformer core, which does not exceed 1.4 T even in the event of an overvoltage. A good lifespan of the semiconductor control device is thus achieved. Experiments have shown that higher magnetic flux densities can possibly reduce this service life.
  • the stray field transformer is preferably designed for a magnetic flux density of 1.2 ... 1.3 T. This value has proven to be very favorable.
  • An embodiment in which the stray field of the stray field transformer is fixed is also very advantageous. Also the Arrangement according to the invention developed with great advantage so that the semiconductor control device is designed for symmetrical control of the power semiconductors, in particular as a digitally operating control device. Especially when there is a sharp drop in power, it seems important that the magnetic flux density in this transformer decrease to approximately zero during the interruption of the current flow in the primary circuit of the stray field transformer, and that there are no flow asymmetries because, for example, the one thyristor switches on earlier than its phase the other. A digitally operating control unit can meet this requirement particularly well, and it enables very simple program control, for example by means of a conventional PC (personal computer).
  • PC personal computer
  • Fig. 1 shows - in a schematic representation - a typical embodiment of the invention.
  • a network connection e.g. with 380 V AC, is labeled L1 and L2.
  • An arrangement is connected to it via a switch 10, which is designated 12 overall.
  • a fuse 13 and then two semiconductor switches in the form of thyristors 14, 15 are connected to the supply line L1 from the switch 10, followed by a current transformer 16, and then the primary winding 17 of a stray field transformer 18, the other connection of which to the supply line L2 is connected by switch 10, as shown in Fig. 1.
  • a UV lamp 23 is connected to the secondary winding 21 of the stray field transformer 18.
  • This can e.g. have an operating voltage, the so-called burning voltage, of 1000 V, an ignition voltage of 1650 V, and a nominal power of 10 kW, in order to give an example of a typical UV lamp.
  • the arc voltages of such lamps are usually between 1000 V and 3800 V, the ignition voltages about a factor of 1.65 higher.
  • the task of the stray field transformer 18 is to supply both the ignition voltage and the burning voltage for the UV lamp 23.
  • a control device 25 which works with phase control and supplies the control pulses for the thyristors 14, 15.
  • the control unit 25 forms, together with the two thyristors 14, 15, a semiconductor control unit, which can also be referred to as a thyristor power controller.
  • thyristor power controllers are e.g. manufactured by AEG under the name Thyro-M type 1M and are therefore not further described here.
  • a thyristor power controller is preferably used in the invention, the signals of which are generated digitally, that is to say with high temporal precision. This is the case with the Thyro-M type mentioned.
  • the current on the primary side 17 of the stray field transformer 18 is detected via the current transformer 16 and supplied to the control unit 25 as an actual value.
  • This control device regulates this current to a value corresponding to a current setpoint value which is fed to its input 27.
  • a corresponding setpoint value is supplied to the input 27 by a controller 30, the function of which is to keep the power of the UV lamp 23 constant at a specific value.
  • the controller 30 receives a power setpoint from a setpoint generator 32, on which this setpoint can be set, e.g. to values between 100% and 30% of the nominal output of the UV lamp 23.
  • the output value of a sensor 34 which is arranged next to the UV lamp 23 and determines its output power, e.g. the value of the UV radiation, or the temperature next to the UV lamp 23.
  • the voltage across the UV lamp 23 can be detected by means of a measuring transducer 36 and fed to the controller 30 as a corresponding signal. It should be pointed out here that normally only one of these two variants is used, i.e. either the voltage measurement or the measurement by means of the sensor 34.
  • Fig. 2 shows - as a pure example - a typical design of a stray field transformer 18.
  • This has an approximately ring-shaped magnetic core, which is made up of individual parts, namely two straight longitudinal legs 40, 41, each having a primary winding 42 and 43 and one Wear secondary winding 44 or 45. As shown, these windings are at a distance D from one another in order to allow the formation of a stray field and the installation of a stray field bridge between the primary windings and the secondary windings.
  • the parts 40, 41, 46, 47 are constructed from transformer sheets, preferably as so-called module cores.
  • Fig. 3 indicates at 50 such sheets in the usual way. They typically have a thickness of 0.5 mm and are insulated from one another.
  • module cores are made up of individual sheets. These sheets are glued together and therefore form a compact block. This block is provided with a polished surface there, where another block connects to it. For example, the module cores 46 and 47 are ground on their two longitudinal ends, so that there is no annoying air gap at the transition to the adjacent module core 40 (left) or 41 (right).
  • So-called stray field plates 52 are arranged within the distance D between the longitudinal legs 40, 41 in the manner shown. They are insulated at the ends by means of an insulating layer 53, 54 and thus clamped between the two longitudinal legs 40, 41. Their number determines the properties of the stray field transformer 18.
  • the primary coils 42, 43 When idling, the primary coils 42, 43 mainly generate a magnetic flux 58 through the longitudinal legs 40, 41 and the two cross pieces 46, 47. This flux 58 causes the desired high ignition voltage on the secondary windings 44, 45 when ignited.
  • a larger cross section of the transformer core 40, 41, 46, 47 is required in an arrangement according to the invention.
  • the cross section that is required for the "normal" case, i.e. without a thyristor control device 14, 15, 25, e.g. when the UV lamp 23 is connected directly to the network L1, L2 via the transformer 18, is denoted by 62.
  • the invention requires an enlarged cross-section, which is typically 30 to 40% larger. This seems illogical, because with reduced lamp power, the transformer 18 only has to transmit a reduced power. It is assumed that this additional iron causes a particularly high ignition voltage in the case of phase control and that this increased ignition voltage in phase control at least supports the strong reduction in power.
  • a stray field transformer 18 with module cores was used for the experiments mentioned.
  • Such module cores also have the advantage that the magnetic flux density in the transformer 18 can easily be increased to 1.25 ... 1.3 T without the semiconductor control device 12 suffering as a result. This is particularly true when the semiconductor control device 12 operates with high precision, that is to say is preferably digitally controlled.
  • Such control devices are, as already mentioned, manufactured under the name Thyro-M type 1M by the company AEG and can be adjusted by means of digital signals.
  • FIGS. 4A and 4B show the voltage u (above) and the current i (below) for the case of lamp operation without phase angle control, e.g. when the two thyristors 14 and 15 are bridged. It can be seen that at the beginning of a half-wave the voltage rises quite sharply and there results an ignition voltage peak A, which in this example had an amplitude of approximately 2.6 kV. The current amplitude B was approximately 12.5 A. In FIGS. 4A, 4B, 5A and 5B, a horizontal division corresponds in each case to 5 ms. Further values are given in the diagrams to enable a comparison.
  • FIGS. 4 and 5B show the voltage u (top) and the current i (bottom) with a power reduction of 70% on the same lamp 23, i.e. this lamp is operated with 30% of its nominal power.
  • the transformer 18 in FIGS. 4 and 5 is made up of module cores with the sheet type V530-50A, which has magnetic losses of about 2.3 W / kg.
  • FIG. 5A It can be seen in FIG. 5A that when a phase is switched on, a much stronger ignition voltage peak A * with an amplitude of approximately 3.3 kV occurs, which acts each time as a new ignition pulse for the lamp 23 and maintains its ionization.
  • the current profile corresponds in principle to that according to Fig. 4A, i.e. the current rise is delayed at the beginning, but in principle takes the form of a sinus half-wave (with a shortened period).
  • the amplitude A * of the ignition voltage is thus about 27% larger than in FIG. 4A.
  • the amplitude B * of the current i here is still 5.6 A.
  • the effective value of the current is given in FIGS. 4B and 5B.
  • the uniform, high ignition voltage pulses A * in FIG. 5A directly after switching on a thyristor thus help to keep the gas in the UV lamp 23 ionized even at low powers, so that the lamp 23 burns reliably even at low powers.
  • Typical values from a test with a UV lamp 23 for a nominal output of 10 kW were: Power consumption Apparent power electricity cos phi 10.0 KW 10.9 kVA 8.08 A. 0.91 1.34 2.23 2.41 0.60 0.85 1.58 2.40 0.54 0.61 1.20 2.08 0.50 0.36 0.84 1.68 0.43
  • thyristor actuator enables - in addition to the price advantages compared to the common circuits with transducers - a very quick adjustment of the power by means of very small control powers.
  • program control is easily possible using a conventional PC.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • X-Ray Techniques (AREA)
  • Control Of Electrical Variables (AREA)
EP93104607A 1992-03-30 1993-03-20 Dispositif à lampe UV Expired - Lifetime EP0563716B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9204210U 1992-03-30
DE9204210 1992-03-30

Publications (2)

Publication Number Publication Date
EP0563716A1 true EP0563716A1 (fr) 1993-10-06
EP0563716B1 EP0563716B1 (fr) 1999-05-26

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ID=6877820

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EP93104607A Expired - Lifetime EP0563716B1 (fr) 1992-03-30 1993-03-20 Dispositif à lampe UV

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EP (1) EP0563716B1 (fr)
AT (1) ATE180621T1 (fr)
DE (1) DE59309600D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001015202A2 (fr) * 1999-08-23 2001-03-01 Bausch & Lomb Incorporated Procedes et systeme de commande en boucle fermee de lampes fluorescentes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554889A1 (de) * 1974-12-12 1976-06-16 Harris Corp Energieversorgungseinrichtung fuer elektrische entladungslampen
FR2420875A1 (fr) * 1978-03-24 1979-10-19 Dubuit Mach Variateur de puissance, notamment pour lampe a rayons ultraviolets
EP0453888A2 (fr) * 1990-04-26 1991-10-30 DIEHL GMBH & CO. Circuit pour alimenter une lampe fluorescente

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554889A1 (de) * 1974-12-12 1976-06-16 Harris Corp Energieversorgungseinrichtung fuer elektrische entladungslampen
FR2420875A1 (fr) * 1978-03-24 1979-10-19 Dubuit Mach Variateur de puissance, notamment pour lampe a rayons ultraviolets
EP0453888A2 (fr) * 1990-04-26 1991-10-30 DIEHL GMBH & CO. Circuit pour alimenter une lampe fluorescente

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001015202A2 (fr) * 1999-08-23 2001-03-01 Bausch & Lomb Incorporated Procedes et systeme de commande en boucle fermee de lampes fluorescentes
WO2001015202A3 (fr) * 1999-08-23 2001-10-04 Bausch & Lomb Procedes et systeme de commande en boucle fermee de lampes fluorescentes

Also Published As

Publication number Publication date
ATE180621T1 (de) 1999-06-15
EP0563716B1 (fr) 1999-05-26
DE59309600D1 (de) 1999-07-01

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