EP1296541B1 - Circuit device and method to produce UV rays - Google Patents

Circuit device and method to produce UV rays Download PDF

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Publication number
EP1296541B1
EP1296541B1 EP01810867A EP01810867A EP1296541B1 EP 1296541 B1 EP1296541 B1 EP 1296541B1 EP 01810867 A EP01810867 A EP 01810867A EP 01810867 A EP01810867 A EP 01810867A EP 1296541 B1 EP1296541 B1 EP 1296541B1
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EP
European Patent Office
Prior art keywords
inverter
circuit
circuit arrangement
frequency
gas discharge
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.)
Expired - Lifetime
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EP01810867A
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German (de)
French (fr)
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EP1296541A1 (en
Inventor
Axel Krause
Bernhard Glaus
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.)
Uviterno AG
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Uviterno AG
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Filing date
Publication date
Application filed by Uviterno AG filed Critical Uviterno AG
Priority to DE50111458T priority Critical patent/DE50111458D1/en
Priority to EP01810867A priority patent/EP1296541B1/en
Priority to AT01810867T priority patent/ATE345661T1/en
Publication of EP1296541A1 publication Critical patent/EP1296541A1/en
Application granted granted Critical
Publication of EP1296541B1 publication Critical patent/EP1296541B1/en
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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

Definitions

  • the invention relates to a circuit arrangement, a device for emitting UV radiation and a method for operating a circuit arrangement with the features of the preamble of the independent claims.
  • Ballasts are used to operate electrical consumers such as gas discharge lamps, for example high-pressure gas discharge lamps for generating ultraviolet light. Ballasts are used to limit the current through the gas discharge lamp so that a stable operating point can be established. At the same time, the ballast generates an alternating current independent of the mains frequency for the operation of the gas discharge lamp. In addition, the ballast is used to increase the mains voltage for the operation of the gas discharge lamp.
  • Electronic ballasts are already known in which the alternating current for operating the gas discharge lamp is generated with inverters with electronic circuit breakers. Such a device is shown for example in DE 42 38 388.
  • a DC-powered bridge resonant converter with controllable electronic switches is used to drive the primary circuit of a high voltage transformer, in the secondary circuit is a UV radiation source.
  • EP 253 224 shows a circuit arrangement for the high-frequency operation of a plurality of low-pressure gas discharge lamps connected in parallel with one another.
  • ballasts are also relatively large, so that there are problems with their installation, for example in printing devices, where UV light is used for curing printing inks. Such a device is shown in WO 98/54525.
  • Another object of the present invention is to provide a circuit arrangement which allows the ignition of gas discharge lamps without the need for additional ignitors.
  • the circuit arrangement according to the invention serves to control at least one electrical load with an alternating current.
  • the electrical load should be with an alternating current be operated with a first, pre-definable frequency.
  • the electrical load is a UV gas discharge lamp.
  • the circuit arrangement is specially designed for use in the industrial sector. It is used, for example, for the operation of UV lamps in the power range of more than 5 kW.
  • the circuit arrangement has a device for generating a direct current.
  • the DC is rectified by a 3-phase three-phase system.
  • the device can be designed as a (passive) mains rectifier or as an (active) converter.
  • the latter serves in particular a sinusoidal mains power consumption.
  • power rectifier passive and active inverter Parallel to the DC output of the mains rectifier, an intermediate circuit capacitor is arranged.
  • the DC link capacitor compensates for variations in supply, ie the network output and demand, ie the lamp output.
  • the circuit arrangement also has a power unit with a first inverter.
  • the first inverter is provided with two electronic circuit breakers, which are alternately switchable with the predetermined first frequency.
  • the switching arrangement also each has a further, second inverter.
  • every second inverter is equipped with two electronic circuit breakers.
  • the electronic power switches of the second inverter are alternately switchable with a second predeterminable frequency.
  • the second predeterminable frequency is preferably a high frequency, in particular a frequency in the range between 20 and 50 kHz.
  • One terminal of each electrical load is connected to the center tap between the circuit breakers of the first inverter.
  • the second terminal of each electrical load is connected to the center tap between the power switches of each one of the second inverters.
  • the first and second inverters are each connected to the DC output of the mains rectifier.
  • the switchable with the first frequency power switch of the first inverter serve to operate the electrical load with the predetermined first frequency.
  • the power switches of the second inverter are advantageously operated at a high frequency, typically 20 to 50 kHz, while the electrical load is typically operable at about 250 Hz. With the second inverter, the current and thus the power in each individual consumer can be individually controlled by pulse width modulation.
  • the circuit arrangement is used to control at least two electrical consumers. At least two electrical consumers are connected to the center tap between the circuit breakers of the first inverter in parallel with each other. Through this parallel connection, the number of required electronic switches for the operation of multiple electrical loads can be reduced. A combination of a parallel connection of several electrical consumers, which is preferred with the center tap between the circuit breakers of the first inverter and a respective second inverter per electrical load as described above.
  • the mains rectifier is for correcting the power factor, i. trained as a PFC.
  • a rectifier designed as a PFC can increase the voltage with which the electrical load can be operated. As a result, lamps with a higher operating voltage can also be operated. Thanks to the PFC, the absorbed mains current always follows the sinusoidal course of the mains voltage. As a result, any standards to be observed can be complied with.
  • the one or more inverters are operated such that a pulse width modulation is performed at their center tap between the circuit breakers.
  • the pulse width modulation is set by an external control circuit.
  • the circuit arrangement is designed according to a further preferred embodiment as a resonant output stage.
  • appropriate measures e.g. additional resonant circuits, which are assigned to the circuit breakers, can prevent switching losses.
  • a resonant output stage therefore allows the operation of the device with a high switching frequency.
  • the DC link is also advantageously constructed with film capacitors. This also makes it possible to achieve lower losses. In addition, there is a higher surge resistance and a longer life.
  • a resonance circuit is arranged between the gas discharge lamp and the first inverter.
  • the first inverter is operable to ignite the gas discharge lamp at a frequency corresponding to the resonant frequency of the resonant circuit. Due to resonance increase results in the center tap between the circuit breakers of the first inverter, a high voltage, which is sufficient for igniting the gas discharge lamp. Therefore, the device according to the invention allows the lamp to be ignited solely by suitable control without a separate ignition device.
  • the power unit is configured as an inverter ignition unit.
  • the power unit has six power switches, which together form a first and two second inverters.
  • the inverters are equipped with four chokes and capacitors.
  • the two reactors with connected capacitors connected to the first inverter form the resonant circuit.
  • This arrangement is for operating two electrical loads, typically gas discharge lamps.
  • Other chokes and capacitors are connected to the second inverter. They serve to keep the high frequency of the second inverter from the lamp.
  • the circuit arrangement is modular.
  • the power rectifier and the power unit are designed as interconnectable and separable modules.
  • the modules are designed as identical power modules, wherein a first power module forms the PFC and a second power module, the inverter ignition unit for operating, for example, two consumers.
  • the output power of the circuit arrangement can be controlled individually for each lamp individually.
  • the inventive circuit arrangement is advantageously operated with a microcontroller. As a result, a flexible operation of the device with desired parameters is possible.
  • the circuit arrangement is provided with inputs and outputs.
  • the inputs allow the coupling of control or regulating signals, for example measured values of the power output by the gas discharge lamp.
  • the outputs allow the output / display of operating parameters of the circuitry, such as the power consumed by the electrical loads.
  • the circuit arrangement described above is advantageously used in a device for emitting UV rays, for example for the polymerization of printing inks in a printing machine.
  • the device may be used as shown in WO 98/54525.
  • This device has at least one, preferably two UV high-pressure gas discharge lamps and a ballast with a circuit arrangement as described above.
  • the second inverter is operated at a high frequency compared to the first frequency of the first inverter.
  • the second frequency is with which the second inverter is operated, about 20 to 50 kHz, while the first frequency at which the first inverter is operated, is typically 250 Hz.
  • the first inverter is operated at a frequency which corresponds to the resonant frequency of the switched between the first inverter and the electrical load resonant circuit.
  • the use of the inventive circuit arrangement for drying or polymerizing printing inks leads to particular advantages.
  • the fast control circuits allow optimal intermittent operation with high power when needed and low idle power, so that the heat generated can be reduced.
  • the device also has the following advantages, particularly in connection with such printing machines. Thanks to the electronic ballast, the lamp current can be set to the setpoint very quickly, within millisecond fractions. This allows you to work with very short cycles. Changes in the lamp power in the millisecond range are easily possible.
  • suitable filters are provided which prevent or reduce the radiation of high-frequency components.
  • FIG. 1 shows a device 18 for emitting UV radiation.
  • the device 18 has a ballast 19, which serves to operate two high-pressure gas discharge lamps 2a, 2b.
  • the ballast 19 contains a circuit arrangement 1.
  • the circuit arrangement 1 has a mains rectifier 3. With the power rectifier 3, a 3-phase AC of a three-phase network 20, for example, 3 x 400 volts, rectified and set to a higher voltage, for example 750 volts DC high.
  • the circuit arrangement 1 is also provided with a DC link capacitor 5, which compensates for fluctuations.
  • a power unit 6 Connected to the intermediate circuit capacitor 5 is a power unit 6 which, according to the required lamp power, has a constant alternating current independent of the mains voltage, typically provides a rectangular alternating current.
  • the device 18 can be operated via a microcontroller 21, which is connected to the circuit arrangement 1 via a potential separation 22.
  • the microcontroller 21 is provided with inputs 23 and with outputs 24.
  • the inputs 23 serve to input control signals, the outputs 24 to output operating values of the device 19, for example the power consumed by the lamps 2a, 2b.
  • the inputs can be used, for example, for the controlled operation of the device 19 with predetermined output lamp power.
  • the circuit arrangement 1 of a first embodiment is shown schematically.
  • the mains rectifier 3 is designed as a bridge rectifier, which is supplied by the three-phase network 20. Parallel to the DC outputs 4a, 4b of the rectifier 3, the DC link capacitor 5 is connected.
  • a first inverter 7 with two power switches 8a, 8b is also connected to the DC outputs 4a, 4b.
  • the first inverter 7 is operated during operation of the circuit arrangement 1 of a first frequency f1 of 250 Hz, so that the power switches 8a, 8b in the center tap 9 between the circuit breakers 8a, 8b produce a rectangular alternating current of 250 Hz. With the center tap 9, the two lamps 2a, 2b are connected in parallel to each other.
  • a resonance circuit 12 is arranged, each composed of a resonance choke 14 a and 14 b and a resonance capacitor 16 a and 16 b.
  • the resonant circuits 12 are used to generate a resonance peak for igniting the gas discharge lamps 2a, 2b by switching the inverter 7 with a frequency f3, which corresponds to the resonant frequency of the resonant circuit 12.
  • Two second inverters 10a, 10b are also connected to the DC outputs 4a, 4b of the mains rectifier 3.
  • the second inverters 10a, 10b are also provided with two power switches 11a, 11b and 11c, 11d, respectively.
  • the second terminal of the gas discharge lamp 2a, 2b is connected via a filter choke 13a and 13b to the center tap 27 each one of the inverters 10a, 10b.
  • the output of the gas discharge lamps 2a, 2b is also provided with the negative DC output 4b of the mains rectifier 3 via a filter capacitor 15a or 15b.
  • While the electronic circuit breakers 8a, 8b are operated at a first frequency f1, which is relatively low, typically 250 Hz, during operation of the device, the power switches 11a, 11b, 11c, 11d of the second inverters 10a, 10b are operated at a second frequency f2 , which is relatively large, typically in the range between 20 and 50 kHz.
  • the electronic power switches 11a, 11b, on the one hand, and 11c, 11d, on the other hand perform a pulse width modulation at the center tap 27, so that the current in the filter chokes 13a, 13b oscillates by a predetermined value.
  • the regulation of the current through the consumers is typically carried out via a microcontroller, which regulates the switching times of the electronic switches 11a, 11b, 11c, 11d.
  • An analogue control is also conceivable.
  • FIG. 3 shows the construction of the circuit breaker shown only schematically in FIG.
  • the circuit breakers are designed as IGBT with integrated diode.
  • circuit breakers from the manufacturer International Rectifier, type IRG4PSH71KD are used.
  • FIG. 4 shows an alternative embodiment of the circuit arrangement. Like reference numerals designate like components.
  • the exemplary embodiment in FIG. 4 is operated only with a gas discharge lamp 2 a, so that only a second inverter 10 a is necessary.
  • FIG. 5 shows a further alternative exemplary embodiment.
  • the mains rectifier 3 is designed as a PFC.
  • the power rectifier 3 is provided with six power switches 17.
  • the power switches 17 are controlled so that the 3-phase alternating current received via throttles 28 is sinusoidal.
  • the intermediate circuit voltage can be boosted above the peak value of the mains alternating voltage.
  • a power rectifier 3 designed as a PFC can be used in combination with the power unit 6 according to FIG. 2, as shown in FIG.
  • the power rectifier 3 and the power unit 6 can be designed as identical modules with 6 electronic power slots each.
  • FIG. 5 shows two series-connected electrical consumers 2a, 2c. An operation of series-connected Consumers are possible thanks to the PFC, which ensures a higher output voltage.
  • FIG. 6 shows the current or the voltage profile at various points of the circuit arrangement according to FIG. 2.
  • the voltage UB1 is shown at the center tap 27 between the power switches 11a, 11b and 11c, 11d of the second inverters 10a and 10b, respectively.
  • the current I1 is represented by the filter choke 13a or 13b.
  • the voltage U1F across the filter capacitors 15a, 15b is shown.
  • the fourth diagram shows the voltage UB2 between center tap 9 between the electronic circuit breakers 8a, 8b of the first inverter 7 and the negative DC connection 4b.
  • the fifth representation shows, compared with the previous representations on a reduced scale, the voltage UlR across the resonance capacitors 16a, 16b.
  • the inverter 7 For igniting the gas discharge lamps, the inverter 7, that is to say its power switches 8a, 8b, is operated for a short time with a high frequency f3 of approximately 24 kHz, which corresponds to the frequency of the resonance circuit 12 with resonance choke 14a, 14b and resonance capacitor 16a, 16b.
  • the circuit breakers generate short bursts of 500 volts (see voltage UB2). This results in a final voltage of up to 4 kV due to resonance increase at the input of the loads 2a, 2b (see fifth illustration).
  • the resonance peak In the first period of 2 milliseconds, as shown in FIG. 6, the resonance peak has not yet led to an ignition of the lamps 2a, 2b.
  • the inverter 7 continues to be operated at the high frequency f3, so that an ignition voltage is generated by resonance increase in the oscillating circuits 12 becomes.
  • the high voltages lead to an ignition in at least one of the lamps 2a, 2b. Once all the lamps have ignited, the lamps can be operated normally. Such bursts only have to be generated until all electrical consumers have ignited. Due to the throttles 14a, 14b, the lamps 2a, 2b are decoupled from each other.
  • the ignition circuit 12 is excited at each switching operation and can deliver high voltage spikes, if the lamps 2a, 2b are not already burning. After ignition, the electronic switches of the first inverter 7 are switched at the predetermined frequency f1 at which the lamps 2a, 2b are to be operated.
  • the voltage UB2 is according to the fourth representation in Figure 6 is a rectangular AC voltage.
  • the current I1 flowing through the lamps 2a, 2b is essentially zero.
  • the amount of the current I1 by the lamp 2a, 2b shifts by a predetermined value.
  • the current direction depends on the circuit of the switches 8a, 8b of the first inverter 7.
  • the switch 8a is closed and the lamp current is negative ie it flows from the positive DC terminal 4a via the switch 8a through the resonance chokes 14a and 14b back through the lamp 2a and 2b to the center tap 27 between the switches 11a , 11b of the second inverter 10a and between the switches 11c, 11d of the second inverter 10b.
  • the current flows with closed switches 11b and 11d to the negative DC terminal 4b, wherein the amount of current increases.
  • the switch 11b is open and the switch 11a is closed, the current drops again.
  • the current can be regulated to the desired value. Since the switching frequency of the second inverters 10a, 10b is high compared to the switching frequency of the first inverter 7, the value of the current is I1 relatively stable and oscillates by the predetermined value. A synchronization of the frequency f1 of the first inverter 7 and the frequency f2 of the second inverter 10a, 10b is not required.
  • the voltage UB1 at the center tap 27 (see uppermost illustration in FIG. 6) oscillates at the frequency f2 between 0 V and a maximum value of 500 V with a rectangular shape.
  • the switches 11a, 11b and 11c, 11d are operated with pulse width modulation so that the lamp current corresponds to the desired value.
  • the switch 8b is closed while the switch 8a is opened.
  • the current therefore flows from the center tap 27 through the lamps 2a and 2b respectively, then through the resonance chokes 14a, 14b and via the power switch 8b to the negative DC connection 4b.
  • ballast 19 has a mains input part 25 with corresponding fuses that allow safe operation of the ballast 19. Fuses for overcurrent protection, PTC resistors for inrush current limiting and a surge arrester are part of the mains input 25.
  • a line filter 26 Downstream of the mains input 25 is a line filter 26, which is intended to reduce symmetrical and asymmetrical interference.
  • the output of the mains filter 26 is passed into the power rectifier 3 designed as a power factor corrector.
  • the power rectifier 3 and the power rectifier 3 downstream power unit 6 are formed as shown schematically in Figure 2 as identical modules. There is also one Output filter 29 of throttles 30 and condensers 31 for reducing emissions provided.
  • the output filter 29 is connected to the two gas discharge lamps 2a, 2b.
  • the current absorbed by the lamps 2a, 2b is measured by current sensors 32.
  • the measured current values serve to regulate the current. You will be entered into the inputs 23 of the microcontroller 21.
  • Further current sensors 33 serve for measuring the current consumption of the mains rectifier 3 and for regulating the mains rectifier 3 designed as PFC.
  • the current through the lamps 2a, 2b is measured individually with the current sensors.
  • the lamp current and thus the lamp power can therefore be controlled individually to a desired value.
  • To control the microcontroller, which controls the circuit breaker serves.
  • ballast 19 makes it possible to operate the lamps with a power of up to two times 10 Kw.
  • each consumer is connected to the center tap between the electronic circuit breakers of the first inverter on the one hand and each with the center tap between the switches of the second inverter.

Abstract

The arrangement has a mains rectifier (3) with an intermediate circuit capacitor (5) in parallel with the d.c. output, a power unit with a static inverter (7) operated at a first frequency and a further second static inverter (10a,10b) per load (2a,2b), each with 2 power switches operated alternately with a second defined frequency. The loads are connected between the junctions of the power switches in the first and associated static inverters. Independent claims are also included for the following: an arrangement for outputting ultraviolet rays, especially for polymerizing ink in a printer, and a method of operating an inventive circuit arrangement.

Description

Die Erfindung betrifft eine Schaltungsanordnung, eine Vorrichtung zur Abgabe von UV-Strahlen und ein Verfahren zum Betreiben einer Schaltungsanordnung mit den Merkmalen des Oberbegriffs der unabhängigen Patentansprüche.The invention relates to a circuit arrangement, a device for emitting UV radiation and a method for operating a circuit arrangement with the features of the preamble of the independent claims.

Zum Betrieb von elektrischen Verbrauchern wie Gasentladungslampen, beispielsweise Hochdruckgasentladungslampen zur Erzeugung von ultraviolettem Licht werden Vorschaltgeräte eingesetzt. Vorschaltgeräte werden dazu verwendet, den Strom durch die Gasentladungslampe so zu begrenzen, dass sich ein stabiler Arbeitspunkt einstellen kann. Gleichzeitig wird mit dem Vorschaltgerät ein von der Netzfrequenz unabhängiger Wechselstrom zum Betrieb der Gasentladungslampe erzeugt. Ausserdem dient das Vorschaltgerät dazu, die Netzspannung zum Betrieb der Gasentladungslampe heraufzusetzen.Ballasts are used to operate electrical consumers such as gas discharge lamps, for example high-pressure gas discharge lamps for generating ultraviolet light. Ballasts are used to limit the current through the gas discharge lamp so that a stable operating point can be established. At the same time, the ballast generates an alternating current independent of the mains frequency for the operation of the gas discharge lamp. In addition, the ballast is used to increase the mains voltage for the operation of the gas discharge lamp.

Es sind bereits elektronische Vorschaltgeräte bekannt, bei welchen der Wechselstrom zum Betreiben der Gasentladungslampe mit Wechselrichtern mit elektronischer Leistungsschaltern erzeugt wird. Eine solche Vorrichtung ist beispielsweise in DE 42 38 388 gezeigt. Ein gleichspannungsgespeister Brückenresonanzwandler mit ansteuerbaren elektronischen Schaltern wird verwendet, um den Primärkreis eines Hochspannungsübertragers anzusteuern, in dessen Sekundärkreis eine UV-Strahlungsquelle liegt.Electronic ballasts are already known in which the alternating current for operating the gas discharge lamp is generated with inverters with electronic circuit breakers. Such a device is shown for example in DE 42 38 388. A DC-powered bridge resonant converter with controllable electronic switches is used to drive the primary circuit of a high voltage transformer, in the secondary circuit is a UV radiation source.

EP 253 224 zeigt eine Schaltungsanordnung zum hochfrequenten Betrieb mehrerer parallel zueinander geschalteter Niederdruckgasentladungslampen.EP 253 224 shows a circuit arrangement for the high-frequency operation of a plurality of low-pressure gas discharge lamps connected in parallel with one another.

Aus EP 698 310 ist ein hochfrequenter Wechselstromwandler mit Leistungsfaktorkorrektur zum Betreiben elektrischer Entladungslampen bekannt. Insbesondere geht daraus hervor, eine Leistungsfaktorkorrekturschaltung (PFC) zu verwenden, um einen hohen Leistungsfaktor zu erhalten. Diese verschiedenen bekannten Vorrichtungen sind aber alle mit bestimmten Nachteilen behaftet.From EP 698 310 a high frequency AC power converter with power factor correction for operating electric discharge lamps is known. In particular, it is apparent to use a power factor correction (PFC) circuit to obtain a high power factor. However, these various known devices all have certain disadvantages.

Der gleichzeitige Betrieb von mehreren Gasentladungslampen mit einem Vorschaltgerät ist häufig nicht möglich. Die Dimensionen der bekannten Vorschaltgeräte sind ausserdem verhältnismässig gross, so dass sich Probleme bei deren Einbau ergeben, beispielsweise in Druckvorrichtungen, wo UV-Licht zum Aushärten von Druckfarben verwendet wird. Eine solche vorrichtung ist in WO 98/54525 gezeigt.The simultaneous operation of multiple gas discharge lamps with a ballast is often not possible. The dimensions of the known ballasts are also relatively large, so that there are problems with their installation, for example in printing devices, where UV light is used for curing printing inks. Such a device is shown in WO 98/54525.

Es ist eine Aufgabe der vorliegenden Erfindung, die Nachteile des Bekannten zu vermeiden, insbesondere also eine Schaltungsanordnung zu schaffen, die wirtschaftlich herstellbar und betreibbar ist, deren Dimensionen verhältnismässig gering sind und die bei Bedarf auch den parallelen Betrieb von mehreren elektrischen Verbrauchern erlaubt. Gleichzeitig soll die Schaltungsanordnung den Betrieb von Verbrauchern mit verhältnismässig hohen Leistungen ermöglichen. Eine weitere Aufgabe der vorliegenden Erfindung besteht darin, eine Schaltungsanordnung zu schaffen, die das Zünden von Gasentladungslampen erlaubt, ohne dass zusätzliche Zündgeräte notwendig sind.It is an object of the present invention to avoid the disadvantages of the known, in particular to provide a circuit arrangement which is economically producible and operable, whose dimensions are relatively low and which also allows the parallel operation of multiple electrical consumers if necessary. At the same time, the circuit should allow the operation of consumers with relatively high power. Another object of the present invention is to provide a circuit arrangement which allows the ignition of gas discharge lamps without the need for additional ignitors.

Erfindungsgemäss werden diese Aufgaben mit den Merkmalen des kennzeichnenden Teils der unabhängigen Patentansprüche gelöst.According to the invention these objects are achieved with the features of the characterizing part of the independent claims.

Die Schaltungsanordnung gemäss der Erfindung dient zur Ansteuerung von wenigstens einem elektrischen Verbraucher mit einem Wechselstrom. Der elektrische Verbraucher soll mit einem Wechselstrom mit einer ersten, vorbestimmbaren Frequenz betrieben werden. Insbesondere ist der elektrische Verbraucher eine UV-Gasentladungslampe. Die Schaltungsanordnung ist besonders für den Einsatz im Industriebereich konzipiert. Sie wird beispielsweise zum Betrieb von UV-Lampen im Leistungsbereich von über 5 kW eingesetzt.The circuit arrangement according to the invention serves to control at least one electrical load with an alternating current. The electrical load should be with an alternating current be operated with a first, pre-definable frequency. In particular, the electrical load is a UV gas discharge lamp. The circuit arrangement is specially designed for use in the industrial sector. It is used, for example, for the operation of UV lamps in the power range of more than 5 kW.

Die Schaltungsanordnung weist eine Vorrichtung zum Erzeugen eines Gleichstroms auf. Typischerweise wird der Gleichstrom von einem 3-phasigen Drehstromnetz gleichgerichtet. Die Vorrichtung kann als (passiver) Netzgleichrichter oder als (aktiver) Umrichter ausgebildet sein. Letzterer dient insbesondere einer möglichst sinusförmigen Netzstromaufnahme. Hier und im folgenden werden unter Netzgleichrichter passive und aktive Umrichter verstanden. Parallel zum Gleichstromausgang des Netzgleichrichters ist ein Zwischenkreiskondensator angeordnet. Der Zwischenkreiskondensator gleicht Schwankungen von Angebot, das heisst der Netzleistung und Nachfrage, das heisst der Lampenleistung aus.The circuit arrangement has a device for generating a direct current. Typically, the DC is rectified by a 3-phase three-phase system. The device can be designed as a (passive) mains rectifier or as an (active) converter. The latter serves in particular a sinusoidal mains power consumption. Here and below are understood by power rectifier passive and active inverter. Parallel to the DC output of the mains rectifier, an intermediate circuit capacitor is arranged. The DC link capacitor compensates for variations in supply, ie the network output and demand, ie the lamp output.

Die Schaltungsanordnung weist ausserdem eine Leistungseinheit mit einem ersten Wechselrichter auf. Der erste Wechselrichter ist mit zwei elektronischen Leistungsschaltern versehen, welche alternierend mit der vorbestimmten ersten Frequenz schaltbar sind.The circuit arrangement also has a power unit with a first inverter. The first inverter is provided with two electronic circuit breakers, which are alternately switchable with the predetermined first frequency.

Pro elektrischen Verbraucher weist die Schaltanordnung ausserdem je einen weiteren, zweiten Wechselrichter auf. Jeder zweite Wechselrichter jedenfalls mit zwei elektronischen Leistungsschaltern versehen. Die elektronischen Leistungsschalter des zweiten Wechselrichter sind mit einer zweiten vorbestimmbaren Frequenz alternierend schaltbar. Die zweite vorbestimmbare Frequenz ist vorzugsweise eine Hochfrequenz, insbesondere eine Frequenz im Bereich zwischen 20 und 50 kHz.For each electrical consumer, the switching arrangement also each has a further, second inverter. In any case, every second inverter is equipped with two electronic circuit breakers. The electronic power switches of the second inverter are alternately switchable with a second predeterminable frequency. The second predeterminable frequency is preferably a high frequency, in particular a frequency in the range between 20 and 50 kHz.

Ein Anschluss jedes elektrischen Verbrauchers ist mit dem Mittenabgriff zwischen den Leistungsschaltern des ersten Wechselrichters verbunden. Der zweite Anschluss jedes elektrischen Verbrauchers ist mit dem Mittenabgriff zwischen den Leistungsschaltern je eines der zweiten Wechselrichter verbunden. Die ersten und zweiten Wechselrichter sind je mit dem Gleichstromausgang des Netzgleichrichters verbunden.One terminal of each electrical load is connected to the center tap between the circuit breakers of the first inverter. The second terminal of each electrical load is connected to the center tap between the power switches of each one of the second inverters. The first and second inverters are each connected to the DC output of the mains rectifier.

Mit der erfindungsgemässen Schaltanordnung ist es möglich, mehrere elektrische Verbraucher gleichzeitig mit einer Schaltungsanordnung zu betreiben. Dabei sind zum Betrieb von N Verbrauchern nur 2 + 2N elektronische Leistungsschalter erforderlich. Kosten und Dimension der Schaltungsanrodnung können daher reduziert werden. Die mit der ersten Frequenz schaltbaren Leistungsschalter des ersten Wechselrichters dienen dabei zum Betrieb der elektrischen Verbraucher mit der vorbestimmten ersten Frequenz. Die Leistungsschalter des zweiten Wechselrichter werden dabei vorteilhaft mit einer hohen Frequenz, typischerweise 20 bis 50 kHz betrieben, während der elektrische Verbraucher typischerweise mit etwa 250 Hz betreibbar ist. Mit dem zweiten Wechselrichter kann durch Pulsweiten-Modulation der Strom und damit die Leistung in jedem einzelnen Verbraucher je einzeln gesteuert werden.With the inventive switching arrangement, it is possible to operate several electrical loads simultaneously with a circuit arrangement. Only 2 + 2N electronic circuit breakers are required to operate N loads. Cost and dimension of Schaltungsanrodnung can therefore be reduced. The switchable with the first frequency power switch of the first inverter serve to operate the electrical load with the predetermined first frequency. The power switches of the second inverter are advantageously operated at a high frequency, typically 20 to 50 kHz, while the electrical load is typically operable at about 250 Hz. With the second inverter, the current and thus the power in each individual consumer can be individually controlled by pulse width modulation.

Gemäss einem alternativen Ausführungsbeispiel der Erfindung dient die Schaltungsanordnung der Ansteuerung von wenigstens zwei elektrischen Verbrauchern. Dabei sind mit dem Mittenabgriff zwischen den Leistungsschaltern des ersten Wechselrichters parallel zueinander wenigstens zwei elektrische Verbraucher verbunden. Durch diese Parallelschaltung kann die Anzahl der erforderlichen elektronischen Schalter zum Betrieb von mehreren elektrischen Verbrauchern reduziert werden. Eine Kombination einer Parallelschaltung von mehreren elektrischen Verbrauchern, die mit dem Mittenabgriff zwischen den Leistungsschaltern des ersten Wechselrichters und je einem zweiten Wechselrichter pro elektrischen Verbraucher wie vorstehend beschrieben wird aber bevorzugt.According to an alternative embodiment of the invention, the circuit arrangement is used to control at least two electrical consumers. At least two electrical consumers are connected to the center tap between the circuit breakers of the first inverter in parallel with each other. Through this parallel connection, the number of required electronic switches for the operation of multiple electrical loads can be reduced. A combination of a parallel connection of several electrical consumers, which is preferred with the center tap between the circuit breakers of the first inverter and a respective second inverter per electrical load as described above.

Gemäss einem weiteren bevorzugten Ausführungsbeispiel ist der Netzgleichrichter zur Korrektur des Leistungsfaktors, d.h. als PFC ausgebildet. Mit einem als PFC ausgebildeten Gleichrichter lässt sich die Spannung, mit welcher der elektrische Verbraucher betrieben werden kann, hinaufsetzen. Dadurch lassen sich auch Lampen mit höherer Brennspannung betreiben. Dank dem PFC folgt ausserdem der aufgenommene Netzstrom stets dem sinusförmigen Verlauf der Netzspannung. Dadurch können allenfalls einzuhaltende Normen eingehalten werden.According to another preferred embodiment, the mains rectifier is for correcting the power factor, i. trained as a PFC. A rectifier designed as a PFC can increase the voltage with which the electrical load can be operated. As a result, lamps with a higher operating voltage can also be operated. Thanks to the PFC, the absorbed mains current always follows the sinusoidal course of the mains voltage. As a result, any standards to be observed can be complied with.

Gemäss einem weiteren bevorzugten Ausführungsbeispiel sind der oder die zweiten Wechselrichter derart betrieben, dass an ihrem Mittenabgriff zwischen dem Leistungsschaltern eine Pulsweiten Modulation durchgeführt wird. Dadurch lassen sich der Strom und damit die Leistung jedes einzelnen Verbrauchers separat regeln. Die Pulsweitenmodulation wird durch einen externen Regelkreis eingestellt.According to a further preferred embodiment, the one or more inverters are operated such that a pulse width modulation is performed at their center tap between the circuit breakers. As a result, the power and thus the power of each individual consumer can be regulated separately. The pulse width modulation is set by an external control circuit.

Die Schaltungsanordnung ist gemäss einem weiteren bevorzugten Ausführungsbeispiel als resonante Endstufe ausgebildet. Durch geeignete Massnahmen, z.B. durch zusätzliche Resonanzkreise, die den Leistungsschaltern zugeordnet werden, lassen sich Schaltverluste verhindern. Eine resonante Endstufe erlaubt daher den Betrieb der Vorrichtung mit einer hohen Schaltfrequenz.The circuit arrangement is designed according to a further preferred embodiment as a resonant output stage. By appropriate measures, e.g. additional resonant circuits, which are assigned to the circuit breakers, can prevent switching losses. A resonant output stage therefore allows the operation of the device with a high switching frequency.

Der Zwischenkreis ist ausserdem vorteilhaft mit Folienkondensatoren aufgebaut. Auch dadurch lassen sich geringere Verluste erzielen. Ausserdem ergibt sich eine höhere Überspannungsfestigkeit und eine längere Lebensdauer.The DC link is also advantageously constructed with film capacitors. This also makes it possible to achieve lower losses. In addition, there is a higher surge resistance and a longer life.

Gemäss noch einem weiteren Ausführungsbeispiel, in dem der elektrische Verbraucher als Gasentladungslampe ausgebildet ist, ist zwischen der Gasentladungslampe und dem ersten Wechselrichter je ein Resonanzkreis angeordnet. Der erste Wechselrichter ist zum Zünden der Gasentladungslampe mit einer Frequenz betreibbar, die der Resonanzfrequenz des Resonanzkreises entspricht. Durch Resonanzüberhöhung ergibt sich am Mittenabgriff zwischen den Leistungsschaltern des ersten Wechselrichters eine hohe Spannung, die ausreichend zum Zünden der Gasentladungslampe ist. Die erfindungsgemässe Vorrichtung erlaubt deshalb, allein durch geeignete Ansteuerung ohne separates Zündgerät die Lampe zu zünden.According to yet another embodiment, in which the electrical load is designed as a gas discharge lamp, a resonance circuit is arranged between the gas discharge lamp and the first inverter. The first inverter is operable to ignite the gas discharge lamp at a frequency corresponding to the resonant frequency of the resonant circuit. Due to resonance increase results in the center tap between the circuit breakers of the first inverter, a high voltage, which is sufficient for igniting the gas discharge lamp. Therefore, the device according to the invention allows the lamp to be ignited solely by suitable control without a separate ignition device.

In einem typischen Ausführungsbeispiel ist die Leistungseinheit als Wechselrichterzündeinheit ausgebildet. Die Leistungseinheit weist sechs Leistungsschalter auf, welche zusammen einen ersten und zwei zweite Wechselrichter bilden. Ausgangsseitig sind die Wechselrichter mit vier Drosseln und Kondensatoren versehen. Dabei bilden die mit dem ersten Wechselrichter verbundenen zwei Drosseln mit angeschlossenen Kondensatoren den Resonanzkreis. Diese Anordnung dient zum Betrieb von zwei elektrischen Verbrauchern, typischerweise Gasentladungslampen. Weitere Drosseln und Kondensatoren sind mit dem zweiten Wechselrichter verbunden. Sie dienen dazu, die Hochfrequenz der zweiten Wechselrichter von der Lampe fernzuhalten.In a typical embodiment, the power unit is configured as an inverter ignition unit. The power unit has six power switches, which together form a first and two second inverters. On the output side, the inverters are equipped with four chokes and capacitors. The two reactors with connected capacitors connected to the first inverter form the resonant circuit. This arrangement is for operating two electrical loads, typically gas discharge lamps. Other chokes and capacitors are connected to the second inverter. They serve to keep the high frequency of the second inverter from the lamp.

Gemäss einem weiteren bevorzugten Ausführungsbeispiel ist die Schaltungsanordnung modular aufgebaut. Der Netzgleichrichter und die Leistungseinheit sind als miteinander verbindbare und voneinander trennbare Module ausgebildet. Die Module sind als identische Leistungsmodule ausgebildet, wobei ein erstes Leistungsmodul den PFC und ein zweites Leistungsmodul die Wechselrichter-Zündeinheit zum Betrieb von z.B. zwei Verbrauchern bildet.According to a further preferred embodiment, the circuit arrangement is modular. The power rectifier and the power unit are designed as interconnectable and separable modules. The modules are designed as identical power modules, wherein a first power module forms the PFC and a second power module, the inverter ignition unit for operating, for example, two consumers.

Die Ausgangsleistung der Schaltungsanordnung ist für jede Lampe einzeln stufenlos regelbar.The output power of the circuit arrangement can be controlled individually for each lamp individually.

Gemäss der vorliegenden Erfindung ist es ausserdem denkbar, zwei elektrische Verbraucher in Serie zu schalten. Dies wird insbesondere mit der Verwendung eines PFC ermöglicht, der eine höhere Zwischenkreisspannung und damit auch eine höhere Lampenspannung erlaubt.According to the present invention, it is also conceivable to connect two electrical loads in series. This is made possible in particular with the use of a PFC, which allows a higher DC link voltage and thus also a higher lamp voltage.

Die erfindungsgemässe Schaltungsanordnung wird vorteilhaft mit einem Microcontroller betrieben. Dadurch wird ein flexibler Betrieb der Vorrichtung mit gewünschten Parametern möglich. Gleichzeitig ist die Schaltungsanordnung mit Eingängen und Ausgängen versehen. Die Eingänge erlauben die Einkopplung von Steuer- oder Regelsignalen, beispielsweise Messwerte der von der Gasentladungslampe abgegebenen Leistung. Die Ausgänge erlauben die Ausgabe/Anzeige von Betriebsparametern der Schaltungsanordnung, beispielsweise die von den elektrischen Verbrauchern aufgenommene Leistung.The inventive circuit arrangement is advantageously operated with a microcontroller. As a result, a flexible operation of the device with desired parameters is possible. At the same time, the circuit arrangement is provided with inputs and outputs. The inputs allow the coupling of control or regulating signals, for example measured values of the power output by the gas discharge lamp. The outputs allow the output / display of operating parameters of the circuitry, such as the power consumed by the electrical loads.

Die vorstehend beschriebene Schaltungsanordnung wird vorteilhaft in einer Vorrichtung zur Abgabe von UV-Strahlen, beispielsweise zum Polymerisieren von Druckfarben in einer Druckmaschine eingesetzt. Beispielsweise kann die Vorrichtung wie in WO 98/54525 gezeigt, verwendet werden. Diese Vorrichtung weist wenigstens eine, vorzugsweise zwei UV-Hochdruckgasentladungslampen und ein Vorschaltgerät mit einer wie vorstehend beschriebenen Schaltungsanordnung auf. Der zweite Wechselrichter wird mit einer im Vergleich zur ersten Frequenz des ersten Wechselrichters hohen Frequenz betrieben. Typischerweise beträgt die zweite Frequenz, mit welcher der zweite Wechselrichter betrieben wird, etwa 20 bis 50 kHz, während die erste Frequenz, auf welcher der erste Wechselrichter betrieben wird, typischerweise 250 Hz beträgt. Zum Erzeugen eines Zündimpulses beim Betrieb einer Gasentladungslampe wird der erste Wechselrichter mit einer Frequenz betrieben, die der Resonanzfrequenz des zwischen dem ersten Wechselrichters und dem elektrischen Verbrauchers geschalteten Resonanzkreises entspricht.The circuit arrangement described above is advantageously used in a device for emitting UV rays, for example for the polymerization of printing inks in a printing machine. For example, the device may be used as shown in WO 98/54525. This device has at least one, preferably two UV high-pressure gas discharge lamps and a ballast with a circuit arrangement as described above. The second inverter is operated at a high frequency compared to the first frequency of the first inverter. Typically, the second frequency is with which the second inverter is operated, about 20 to 50 kHz, while the first frequency at which the first inverter is operated, is typically 250 Hz. For generating an ignition pulse during operation of a gas discharge lamp, the first inverter is operated at a frequency which corresponds to the resonant frequency of the switched between the first inverter and the electrical load resonant circuit.

Die Verwendung der erfindungsgemässen Schaltungsanordnung zum Trocknen oder Polymerisieren von Druckfarben führt zu besonderen Vorteilen. Insbesondere können trotz beschränkten Platzverhältnissen mehrere UV-Lampen betrieben werden. Die schnellen Regelkreise erlauben einen optimalen intermittierenden Betrieb mit hoher Leistung bei Bedarf und geringer Leerlaufleistung, so dass sich die erzeugte Wärme reduzieren lässt. Die Vorrichtung hat ausserdem insbesondere in Zusammenhang mit solchen Druckmaschinen folgende Vorteilen. Durch das elektronische Vorschaltgerät lässt sich der Lampenstrom sehr rasch auf den Sollwert einstellen, innerhalb von Millisekunden-Bruchteilen. Dadurch kann mit sehr kurzen Zyklen gearbeitet werden. Änderungen der Lampenleistung im Millisekundenbereich sind problemlos möglich.The use of the inventive circuit arrangement for drying or polymerizing printing inks leads to particular advantages. In particular, despite limited space several UV lamps can be operated. The fast control circuits allow optimal intermittent operation with high power when needed and low idle power, so that the heat generated can be reduced. The device also has the following advantages, particularly in connection with such printing machines. Thanks to the electronic ballast, the lamp current can be set to the setpoint very quickly, within millisecond fractions. This allows you to work with very short cycles. Changes in the lamp power in the millisecond range are easily possible.

Gemäss der Erfindung werden ausserdem geeignete Filter vorgesehen, die die Abstrahlung von hochfrequenten Anteilen verhindern oder reduzieren.According to the invention also suitable filters are provided which prevent or reduce the radiation of high-frequency components.

Die Erfindung wird im Folgenden in Ausführungsbeispielen und an Hand der Zeichnungen näher erläutert. Es zeigen:

Figur 1:
eine schematische Darstellung einer erfindungsgemässen Vorrichtung zur Abgabe von UV-Strahlen,
Figur 2:
eine schematische Darstellung einer erfindungsgemässen Schaltungsanordnung,
Figur 3:
eine vergrösserte Darstellung eines Leistungsschalters der erfindungsgemässen Schaltungsanordnung,
Figur 4:
eine schematische Darstellung eines ersten alternativen Ausführungsbeispiels der Schaltungsanordnung,
Figur 5:
eine schematische Darstellung eines zweiten alternativen Ausführungsbeispiels der erfindungsgemässen Schaltungsanordnung,
Figur 6:
Darstellung von Spannungs- und Stromverlauf beim Betrieb der Schaltungsanordnung gemäss Figur 2 und
Figur 7:
detailliertere Darstellung der Schaltungsanordnung gemäss Figur 2 in einer erfindungsgemässen Vorrichtung.
The invention will be explained in more detail below in embodiments and with reference to the drawings. Show it:
FIG. 1:
a schematic representation of an inventive device for emitting UV rays,
FIG. 2:
a schematic representation of an inventive circuit arrangement,
FIG. 3:
an enlarged view of a circuit breaker of the inventive circuit arrangement,
FIG. 4:
a schematic representation of a first alternative embodiment of the circuit arrangement,
FIG. 5:
a schematic representation of a second alternative embodiment of the inventive circuit arrangement,
FIG. 6:
Representation of voltage and current course during operation of the circuit arrangement according to Figure 2 and
FIG. 7:
more detailed representation of the circuit arrangement according to Figure 2 in a device according to the invention.

Figur 1 zeigt eine Vorrichtung 18 zur Abgabe von UV-Strahlung. Die Vorrichtung 18 weist ein Vorschaltgerät 19 auf, welches zum Betrieb von zwei Hochdruckgasentladungslampen 2a, 2b dient. Das Vorschaltgerät 19 enthält eine Schaltungsanordnung 1. Die Schaltungsanordnung 1 weist einen Netzgleichrichter 3 auf. Mit dem Netzgleichrichter 3 kann ein 3-Phasen Wechselstrom eines Drehstromnetzes 20, beispielsweise 3 x 400 Volt, gleichgerichtet und auf eine höhere Spannung, beispielsweise 750 Volt DC hochgesetzt werden. Die Schaltungsanordnung 1 ist ausserdem mit einem Zwischenkreiskondensator 5 versehen, der Schwankungen ausgleicht. Mit dem Zwischenkreiskondensator 5 ist eine Leistungseinheit 6 verbunden, welche gemäss der geforderten Lampenleistung einen konstanten, von der Netzspannung unabhängigen Wechselstrom, typischerweise einen Rechteckwechselstrom liefert. Die Vorrichtung 18 ist über einen Microcontroller 21 betreibbar, der über eine Potentialtrennung 22 mit der Schaltungsanordnung 1 verbunden ist. Der Microcontroller 21 ist mit Eingängen 23 und mit Ausgängen 24 versehen. Die Eingänge 23 dienen zur Eingabe von Steuersignalen, die Ausgänge 24 zur Ausgabe von Betriebswerten der Vorrichtung 19, beispielsweise der von den Lampen 2a, 2b aufgenommenen Leistung. Die Eingänge können beispielsweise zum geregelten Betrieb der Vorrichtung 19 mit vorgegebener abgegebener Lampenleistung verwendet werden.FIG. 1 shows a device 18 for emitting UV radiation. The device 18 has a ballast 19, which serves to operate two high-pressure gas discharge lamps 2a, 2b. The ballast 19 contains a circuit arrangement 1. The circuit arrangement 1 has a mains rectifier 3. With the power rectifier 3, a 3-phase AC of a three-phase network 20, for example, 3 x 400 volts, rectified and set to a higher voltage, for example 750 volts DC high. The circuit arrangement 1 is also provided with a DC link capacitor 5, which compensates for fluctuations. Connected to the intermediate circuit capacitor 5 is a power unit 6 which, according to the required lamp power, has a constant alternating current independent of the mains voltage, typically provides a rectangular alternating current. The device 18 can be operated via a microcontroller 21, which is connected to the circuit arrangement 1 via a potential separation 22. The microcontroller 21 is provided with inputs 23 and with outputs 24. The inputs 23 serve to input control signals, the outputs 24 to output operating values of the device 19, for example the power consumed by the lamps 2a, 2b. The inputs can be used, for example, for the controlled operation of the device 19 with predetermined output lamp power.

In Figur 2 ist die Schaltungsanordnung 1 eines ersten Ausführungsbeispiels schematisch dargestellt. Der Netzgleichrichter 3 ist als Brückengleichrichter ausgebildet, der vom Drehstromnetz 20 versorgt wird. Parallel zu den Gleichstromausgängen 4a, 4b des Gleichrichters 3 ist der Zwischenkreiskondensator 5 geschaltet. Ein erster Wechselrichter 7 mit zwei Leistungsschaltern 8a, 8b ist ebenfalls mit den Gleichstromausgängen 4a, 4b verbunden. Der erste Wechselrichter 7 wird bei Betrieb der Schaltungsanordnung 1 einer ersten Frequenz f1 von 250 Hz betrieben, so dass die Leistungsschalter 8a, 8b im Mittenabgriff 9 zwischen den Leistungsschaltern 8a, 8b einen Rechteckwechselstrom von 250 Hz erzeugen. Mit dem Mittenabgriff 9 sind parallel zueinander die beiden Lampen 2a, 2b verbunden. Zwischen dem Mittenabgriff 9 und den Lampen 2a, 2b ist je ein Resonanzkreis 12 angeordnet, der sich je aus einer Resonanzdrossel 14a bzw. 14b und einem Resonanzkondensator 16a bzw. 16b zusammensetzt. Die Resonanzkreise 12 dienen zum Erzeugen einer Resonanzüberhöhung zum Zünden der Gasentladungslampen 2a, 2b durch Schaltung des Wechselrichters 7 mit einer Frequenz f3, die der Resonanzfrequenz des Resonanzkreises 12 entspricht.In Figure 2, the circuit arrangement 1 of a first embodiment is shown schematically. The mains rectifier 3 is designed as a bridge rectifier, which is supplied by the three-phase network 20. Parallel to the DC outputs 4a, 4b of the rectifier 3, the DC link capacitor 5 is connected. A first inverter 7 with two power switches 8a, 8b is also connected to the DC outputs 4a, 4b. The first inverter 7 is operated during operation of the circuit arrangement 1 of a first frequency f1 of 250 Hz, so that the power switches 8a, 8b in the center tap 9 between the circuit breakers 8a, 8b produce a rectangular alternating current of 250 Hz. With the center tap 9, the two lamps 2a, 2b are connected in parallel to each other. Between the center tap 9 and the lamps 2 a, 2 b, a resonance circuit 12 is arranged, each composed of a resonance choke 14 a and 14 b and a resonance capacitor 16 a and 16 b. The resonant circuits 12 are used to generate a resonance peak for igniting the gas discharge lamps 2a, 2b by switching the inverter 7 with a frequency f3, which corresponds to the resonant frequency of the resonant circuit 12.

Zwei zweite Wechselrichter 10a, 10b sind ebenfalls mit den Gleichstromausgängen 4a, 4b des Netzgleichrichters 3 verbunden. Die zweiten Wechselrichter 10a, 10b sind ebenfalls mit je zwei Leistungsschaltern 11a, 11b bzw. 11c, 11d versehen. Der zweite Anschluss der Gasentladungslampe 2a, 2b ist über eine Filterdrossel 13a bzw. 13b mit dem Mittenabgriff 27 je eines der Wechselrichter 10a, 10b verbunden. Der Ausgang der Gasentladungslampen 2a, 2b ist ausserdem über einen Filterkondensator 15a, bzw. 15b mit dem negativen Gleichstromausgang 4b des Netzgleichrichters 3 versehen.Two second inverters 10a, 10b are also connected to the DC outputs 4a, 4b of the mains rectifier 3. The second inverters 10a, 10b are also provided with two power switches 11a, 11b and 11c, 11d, respectively. The second terminal of the gas discharge lamp 2a, 2b is connected via a filter choke 13a and 13b to the center tap 27 each one of the inverters 10a, 10b. The output of the gas discharge lamps 2a, 2b is also provided with the negative DC output 4b of the mains rectifier 3 via a filter capacitor 15a or 15b.

Während die elektronischen Leistungsschalter 8a, 8b beim Betrieb der Vorrichtung auf einer ersten Frequenz f1 betrieben werden, die verhältnismässig niedrig ist, typischerweise 250 Hz, werden die Leistungsschalter 11a, 11b, 11c, 11d der zweiten Wechselrichter 10a, 10b auf einer zweiten Frequenz f2 betrieben, die verhältnismässig gross ist, typischerweise im Bereich zwischen 20 und 50 kHz. Die elektronischen Leistungsschalter 11a, 11b einerseits bzw. 11c, 11d andererseits führen am Mittenabgriff 27 eine Pulsweiten-Modulation durch, so dass der Strom in den Filterdrosseln 13a, 13b um einen vorgegebenen Wert pendelt. Die Regelung des Stroms durch die Verbraucher erfolgt typischerweise über einen Microcontroller, der die Schaltzeiten der elektronischen Schalter 11a, 11b, 11c, 11d regelt. Auch eine analoge Regelung ist denkbar.While the electronic circuit breakers 8a, 8b are operated at a first frequency f1, which is relatively low, typically 250 Hz, during operation of the device, the power switches 11a, 11b, 11c, 11d of the second inverters 10a, 10b are operated at a second frequency f2 , which is relatively large, typically in the range between 20 and 50 kHz. The electronic power switches 11a, 11b, on the one hand, and 11c, 11d, on the other hand, perform a pulse width modulation at the center tap 27, so that the current in the filter chokes 13a, 13b oscillates by a predetermined value. The regulation of the current through the consumers is typically carried out via a microcontroller, which regulates the switching times of the electronic switches 11a, 11b, 11c, 11d. An analogue control is also conceivable.

Figur 3 zeigt den Aufbau der in Figur 2 nur schematisch dargestellten Leistungsschalter. Die Leistungsschalter sind als IGBT mit integrierter Diode ausgebildet. Typischerweise werden Leistungsschalter des Herstellers International Rectifier, Typ IRG4PSH71KD eingesetzt.FIG. 3 shows the construction of the circuit breaker shown only schematically in FIG. The circuit breakers are designed as IGBT with integrated diode. Typically, circuit breakers from the manufacturer International Rectifier, type IRG4PSH71KD are used.

Die vorstehend beschriebenen Komponenten sind im Ausführungsbeispiel wie folgt dimensioniert:

  • Filterdrosseln 13a, 13b: je 500 H
  • Resonanzdrossel 14a, 14b: je 500 H
  • Filterkondensator 15a, 15b: 13.6 F
  • Resonanzkondensator 16a, 16b: 88nF
  • Zwischenkreiskondensator 5: 40 F
  • Gasentladungslampe: z.B. Mitteldruck Quecksilberdampflampe oder Hochdruck-Gasentladungslampe herkömmlicher Bauart.
  • f3: 24 kHz
The components described above are dimensioned in the exemplary embodiment as follows:
  • Filter chokes 13a, 13b: 500 H each
  • Resonance choke 14a, 14b: 500 H each
  • Filter capacitor 15a, 15b: 13.6 F
  • Resonance capacitor 16a, 16b: 88nF
  • DC link capacitor 5: 40 F
  • Gas discharge lamp: eg medium pressure mercury vapor lamp or high pressure gas discharge lamp of conventional design.
  • f3: 24kHz

In Figur 4 ist ein alternatives Ausführungsbeispiel der Schaltungsanordnung gezeigt. Gleiche Bezugszeichen bezeichnen gleiche Komponenten. Im Gegensatz zum Ausführungsbeispiel gemäss Figur 2 wird das Ausführungsbeispiel in Figur 4 jedoch nur mit einer Gasentladungslampe 2a betrieben, so dass nur ein zweiter Wechselrichter 10a notwendig ist.FIG. 4 shows an alternative embodiment of the circuit arrangement. Like reference numerals designate like components. In contrast to the exemplary embodiment according to FIG. 2, however, the exemplary embodiment in FIG. 4 is operated only with a gas discharge lamp 2 a, so that only a second inverter 10 a is necessary.

Figur 5 zeigt ein weiteres alternatives Ausführungsbeispiel. Gemäss Figur 5 ist der Netzgleichrichter 3 als PFC ausgebildet. Der Netzgleichrichter 3 ist mit sechs Leistungsschaltern 17 versehen. Die Leistungsschalter 17 werden so gesteuert, dass der über Drosseln 28 aufgenommene 3-phasen-Wechselstrom sinusförmig ist. Gleichzeitig kann die Zwischenkreisspannung über den Scheitelwert der Netzwechselspannung hochgesetzt werden. Besonders vorteilhaft lässt sich ein als PFC ausgebildeten Netzgleichrichter 3 wie in Figur 5 gezeigt in Kombination mit der Leistungseinheit 6 gemäss Figur 2 einsetzen. Der Netzgleichrichter 3 und die Leistungseinheit 6 können dabei als identische Module mit je 6 elektronischen Leistungscharten ausgebildet sein. Figur 5 zeigt zwei in Serie zueinander geschaltete elektrische Verbraucher 2a, 2c. Ein Betrieb von in Serie zueinander geschalteten Verbrauchern ist dank dem PFC möglich, der für eine höhere Ausgangsspannung sorgt.FIG. 5 shows a further alternative exemplary embodiment. According to FIG. 5, the mains rectifier 3 is designed as a PFC. The power rectifier 3 is provided with six power switches 17. The power switches 17 are controlled so that the 3-phase alternating current received via throttles 28 is sinusoidal. At the same time, the intermediate circuit voltage can be boosted above the peak value of the mains alternating voltage. Particularly advantageously, a power rectifier 3 designed as a PFC can be used in combination with the power unit 6 according to FIG. 2, as shown in FIG. The power rectifier 3 and the power unit 6 can be designed as identical modules with 6 electronic power slots each. FIG. 5 shows two series-connected electrical consumers 2a, 2c. An operation of series-connected Consumers are possible thanks to the PFC, which ensures a higher output voltage.

Figur 6 zeigt den Strom- bzw. den Spannungsverlauf an verschiedenen Punkten der Schaltungsanordnung gemäss Figur 2.FIG. 6 shows the current or the voltage profile at various points of the circuit arrangement according to FIG. 2.

In der obersten Kurve eins ist die Spannung UB1 am Mittenabgriff 27 zwischen den Leistungsschaltern 11a, 11b bzw. 11c, 11d der zweiten Wechselrichter 10a bzw. 10b gezeigt. In der zweiten Darstellung ist der Strom I1 durch die Filterdrossel 13a bzw. 13b dargestellt. In der dritten Darstellung ist die Spannung U1F über den Filterkondensatoren 15a, 15b gezeigt. Die vierte Darstellung zeigt die Spannung UB2 zwischen Mittenabgriff 9 zwischen den elektronischen Leistungsschaltern 8a, 8b des ersten Wechselrichters 7 und dem negativen Gleichstromanschluss 4b. Die fünfte Darstellung zeigt, gegenüber den vorhergehenden Darstellungen in verkleinertem Massstab, die Spannung UlR über den Resonanzkondensatoren 16a, 16b.In the uppermost curve one, the voltage UB1 is shown at the center tap 27 between the power switches 11a, 11b and 11c, 11d of the second inverters 10a and 10b, respectively. In the second illustration, the current I1 is represented by the filter choke 13a or 13b. In the third illustration, the voltage U1F across the filter capacitors 15a, 15b is shown. The fourth diagram shows the voltage UB2 between center tap 9 between the electronic circuit breakers 8a, 8b of the first inverter 7 and the negative DC connection 4b. The fifth representation shows, compared with the previous representations on a reduced scale, the voltage UlR across the resonance capacitors 16a, 16b.

Zum Zünden der Gasentladungslampen wird der Wechselrichter 7, das heisst dessen Leistungsschalter 8a, 8b kurzzeitig mit einer hohen Frequenz f3 von ca. 24 kHz betrieben, die der Frequenz des Resonanzkreises 12 mit Resonanzdrossel 14a, 14b und Resonanzkondensator 16a, 16b entspricht. Die Leistungsschalter erzeugen kurze Bursts von 500 Volt (siehe Spannung UB2). Dadurch ergibt sich auf Grund von Resonanzüberhöhung am Eingang der Verbraucher 2a, 2b eine Endspannung von bis zu 4 kV (siehe fünfte Darstellung). In der ersten Periode von 2 Millisekunden hat gemäss der Darstellung in Figur 6 die Resonanzüberhöhung noch nicht zu einer Zündung der Lampen 2a, 2b geführt. Deshalb wird in der zweiten Periode (2 bis 4 bis Millisekunden) der Wechselrichter 7 weiter mit der hohen Frequenz f3 betrieben, so dass durch Resonanzerhöhung in den Schwingkreisen 12 eine Zündspannung erzeugt wird. Die hohen Spannungen führen zu einer Zündung in wenigstens einer der Lampen 2a, 2b. Sobald alle Lampen gezündet haben, können die Lampen normal betrieben werden. Solche Bursts müssen nur solange erzeugt werden, bis alle elektrischen Verbraucher gezündet haben. Auf Grund der Drosseln 14a, 14b sind die Lampen 2a, 2b voneinander entkoppelt. Der Zündschwingkreis 12 wird bei jedem Umschaltvorgang angeregt und kann hohe Spannungsspitzen liefern, falls die Lampen 2a, 2b nicht bereits schon brennen.
Nach der Zündung werden die elektronischen Schalter des ersten Wechselrichters 7 mit der vorbestimmten Frequenz f1 geschaltet, mit welcher die Lampen 2a, 2b betrieben werden sollen. Die Spannung UB2 ist gemäss der vierten Darstellung in Figur 6 eine rechteckförmige Wechselspannung.For igniting the gas discharge lamps, the inverter 7, that is to say its power switches 8a, 8b, is operated for a short time with a high frequency f3 of approximately 24 kHz, which corresponds to the frequency of the resonance circuit 12 with resonance choke 14a, 14b and resonance capacitor 16a, 16b. The circuit breakers generate short bursts of 500 volts (see voltage UB2). This results in a final voltage of up to 4 kV due to resonance increase at the input of the loads 2a, 2b (see fifth illustration). In the first period of 2 milliseconds, as shown in FIG. 6, the resonance peak has not yet led to an ignition of the lamps 2a, 2b. Therefore, in the second period (2 to 4 to milliseconds), the inverter 7 continues to be operated at the high frequency f3, so that an ignition voltage is generated by resonance increase in the oscillating circuits 12 becomes. The high voltages lead to an ignition in at least one of the lamps 2a, 2b. Once all the lamps have ignited, the lamps can be operated normally. Such bursts only have to be generated until all electrical consumers have ignited. Due to the throttles 14a, 14b, the lamps 2a, 2b are decoupled from each other. The ignition circuit 12 is excited at each switching operation and can deliver high voltage spikes, if the lamps 2a, 2b are not already burning.
After ignition, the electronic switches of the first inverter 7 are switched at the predetermined frequency f1 at which the lamps 2a, 2b are to be operated. The voltage UB2 is according to the fourth representation in Figure 6 is a rectangular AC voltage.

Solange keine Zündung erfolgt ist, ist der durch die Lampen 2a, 2b fliessende Strom I1 im wesentlichen Null. Nach der Zündung pendelt der Betrag des Stroms I1 durch die Lampe 2a, 2b um einen vorbestimmten Wert. Die Stromrichtung hängt von der Schaltung der Schalter 8a, 8b des ersten Wechselrichters 7 ab. Im Zeitpunkt zwischen 2 und 4 ms ist der Schalter 8a geschlossen und der Lampenstrom ist negativ d.h. er fliesst vom positiven Gleichstromanschluss 4a über den Schalter 8a durch die Resonanzdrosseln 14a bzw. 14b rückwärts durch die Lampe 2a bzw. 2b zum Mittenabgriff 27 zwischen den Schaltern 11a, 11b des zweiten Wechselrichters 10a bzw. zwischen den Schaltern 11c, 11d des zweiten Wechselrichters 10b. Der Strom fliesst bei geschlossenen Schaltern 11b bzw. 11d zum negativen Gleichstromanschluss 4b, wobei sich der Betrag des Stroms erhöht. Wenn der Schalter 11b offen und der Schalter 11a geschlossen ist, sinkt der Strom wieder ab. Durch gezielte Wahl der Schaltzeiten lässt sich der Strom auf den gewünschten Wert regeln. Da die Schaltfrequenz der zweiten Wechselrichter 10a, 10b im Vergleich zur Schaltfrequenz des ersten Wechselrichters 7 hoch ist, ist der Wert des Stroms I1 verhältnismässig stabil und pendelt um den vorgegebenen Wert. Eine Synchronisierung der Frequenz f1 des ersten Wechselrichters 7 und der Frequenz f2 des zweiten Wechselrichters 10a, 10b ist nicht erforderlich.As long as no ignition has taken place, the current I1 flowing through the lamps 2a, 2b is essentially zero. After ignition, the amount of the current I1 by the lamp 2a, 2b shifts by a predetermined value. The current direction depends on the circuit of the switches 8a, 8b of the first inverter 7. At the time between 2 and 4 ms, the switch 8a is closed and the lamp current is negative ie it flows from the positive DC terminal 4a via the switch 8a through the resonance chokes 14a and 14b back through the lamp 2a and 2b to the center tap 27 between the switches 11a , 11b of the second inverter 10a and between the switches 11c, 11d of the second inverter 10b. The current flows with closed switches 11b and 11d to the negative DC terminal 4b, wherein the amount of current increases. When the switch 11b is open and the switch 11a is closed, the current drops again. By selective selection of the switching times, the current can be regulated to the desired value. Since the switching frequency of the second inverters 10a, 10b is high compared to the switching frequency of the first inverter 7, the value of the current is I1 relatively stable and oscillates by the predetermined value. A synchronization of the frequency f1 of the first inverter 7 and the frequency f2 of the second inverter 10a, 10b is not required.

Die Spannung UB1 am Mittenabgriff 27 (siehe oberste Darstellung in Figur 6) schwingt mit der Frequenz f2 zwischen 0 V und einem Maximalwert von 500 V mit einer Rechteckform. Die Schalter 11a, 11b bzw. 11c, 11d werden mit Pulsweitenmodulation so betrieben, dass der Lampenstrom dem Sollwert entspricht.The voltage UB1 at the center tap 27 (see uppermost illustration in FIG. 6) oscillates at the frequency f2 between 0 V and a maximum value of 500 V with a rectangular shape. The switches 11a, 11b and 11c, 11d are operated with pulse width modulation so that the lamp current corresponds to the desired value.

Im Zeitpunkt zwischen 4 und 6 ms ist der Schalter 8b geschlossen, während der Schalter 8a geöffnet wird. Der Strom fliesst daher vom Mittenabgriff 27 durch die Lampen 2a bzw. 2b, dann durch die Resonanzdrosseln 14a, 14b und über den Leistungsschalter 8b zum negativen Gleichstromanschluss 4b.At the time between 4 and 6 ms, the switch 8b is closed while the switch 8a is opened. The current therefore flows from the center tap 27 through the lamps 2a and 2b respectively, then through the resonance chokes 14a, 14b and via the power switch 8b to the negative DC connection 4b.

In Figur 7 ist das gesamte Vorschaltgerät 19 detaillierter dargestellt. Das Vorschaltgerät 19 weist einen Netzeingangsteil 25 mit entsprechenden Sicherungen auf, die einen sicheren Betrieb des Vorschaltgeräts 19 erlauben. Sicherungen zum Überstromschutz, PTC-Widerstände zur Einschaltstrombegrenzung und ein Überspannungsableiter sind Teil des Netzeingangs 25.In Figure 7, the entire ballast 19 is shown in more detail. The ballast 19 has a mains input part 25 with corresponding fuses that allow safe operation of the ballast 19. Fuses for overcurrent protection, PTC resistors for inrush current limiting and a surge arrester are part of the mains input 25.

Dem Netzeingang 25 nachgeschaltet ist ein Netzfilter 26, der symmetrische und asymmetrische Störungen reduzieren soll.Downstream of the mains input 25 is a line filter 26, which is intended to reduce symmetrical and asymmetrical interference.

Der Ausgang des Netzfilters 26 wird in den als Powerfactor corrector ausgebildeten Netzgleichrichter 3 geleitet.The output of the mains filter 26 is passed into the power rectifier 3 designed as a power factor corrector.

Der Netzgleichrichter 3 und die dem Netzgleichrichter 3 nachgeschaltete Leistungseinheit 6 sind wie in Figur 2 schematisch dargestellt als identische Module ausgebildet. Ausserdem ist ein Ausgangsfilter 29 aus Drosseln 30 und Kondensatoren 31 zur Reduktion von Abstrahlungen vorgesehen.The power rectifier 3 and the power rectifier 3 downstream power unit 6 are formed as shown schematically in Figure 2 as identical modules. There is also one Output filter 29 of throttles 30 and condensers 31 for reducing emissions provided.

Der Ausgangsfilter 29 ist mit den beiden Gasentladungslampen 2a, 2b verbunden. Der von den Lampen 2a, 2b aufgenommene Strom wird mit Stromsensoren 32 gemessen. Die gemessenen Stromwerte dienen zur Regelung des Stroms. Sie werden dazu in die Eingänge 23 des Microcontrollers 21 eingegeben. Weitere Stromsensoren 33 dienen zum Messen der Stromaufnahme des Netzgleichrichters 3 und zur Regelung des als PFC ausgebildeten Netzgleichrichters 3.The output filter 29 is connected to the two gas discharge lamps 2a, 2b. The current absorbed by the lamps 2a, 2b is measured by current sensors 32. The measured current values serve to regulate the current. You will be entered into the inputs 23 of the microcontroller 21. Further current sensors 33 serve for measuring the current consumption of the mains rectifier 3 and for regulating the mains rectifier 3 designed as PFC.

Der Strom durch die Lampen 2a, 2b wird mit den Stromsensoren individuell gemessen. Der Lampenstrom und damit die Lampenleistung kann daher individuell auf einen Sollwert geregelt werden. Zur Regelung dient der Microcontroller, der die Leistungsschalter ansteuert.The current through the lamps 2a, 2b is measured individually with the current sensors. The lamp current and thus the lamp power can therefore be controlled individually to a desired value. To control the microcontroller, which controls the circuit breaker serves.

Typischerweise werden herkömmliche UV Gasentladungslampen verwendet. Das Vorschaltgerät 19 ermöglicht es, die Lampen mit einer Leistung von bis zu zwei mal 10 Kw zu betreiben.Typically, conventional UV gas discharge lamps are used. The ballast 19 makes it possible to operate the lamps with a power of up to two times 10 Kw.

Es ist auch denkbar, mit der Schaltungsanordnung mehr als zwei elektrische Verbraucher parallel zueinander zu betreiben. Dazu wird je ein weiterer zweiter Wechselrichter vorgesehen und jeder Verbraucher wird mit dem Mittenabgriff zwischen den elektronischen Leistungsschaltern des ersten Wechselrichters einerseits und je mit dem Mittenabgriff zwischen den Schaltern eines der zweiten Wechselrichter verbunden.It is also conceivable to operate with the circuit arrangement more than two electrical loads parallel to each other. For this purpose, a further second inverter is provided and each consumer is connected to the center tap between the electronic circuit breakers of the first inverter on the one hand and each with the center tap between the switches of the second inverter.

Claims (16)

  1. Circuit arrangement (1) for controlling at least two electrical loads (2a, 2b) with an alternating current at a first presettable frequency (f1), in particular for a high pressure gas discharge lamp, comprising a mains rectifier (3) having an intermediate circuit capacitor (5) connected in parallel with the direct current output (4a, 4b) and a power unit (6) for generating the alternating current with a first inverter (7) with two electronic circuit breakers (8a, 8b) which are switchable alternately at the first presettable frequency (f1), whereby one circuit breaker (8a, 8b) is connected to each direct current output (4a, 4b) of the mains rectifier (3), characterised in that the circuit arrangement (1) has one further, second inverter (10a, 10b) per electrical load (2a, 2b), each inverter having two electronic circuit breakers (11a, 11b, 11c, 11d) which are switchable alternately at a second presettable frequency (f2), wherein one circuit breaker (11a, 11b, 11c, 11d) of the second inverter is connected to each direct current output (4a, 4b) of the mains rectifier (3), wherein each electrical load (2a, 2b) is connected, on one side, to the centre tap (9) between the circuit breakers (8a, 8b) of the first inverter (7) and wherein, on the other side, each electrical load (2a, 2b) is connected to the centre tap (27) between the circuit breakers (11a, 11b, 11c, 11d) of, respectively, one of the second inverters (10a, 10b).
  2. Circuit arrangement according to claim 1 for controlling at least two electrical loads (2a, 2b) with an alternating current at a first presettable frequency (f1), in particular for a high pressure gas discharge lamp, comprising a mains rectifier (3) having an intermediate circuit capacitor (5) connected in parallel with the direct current output (4a, 4b), and a power unit (6) for generating the alternating current with a first inverter (7) with two electronic circuit breakers (8a, 8b) which are switchable alternately at a first presettable frequency (f1), characterised in that one circuit breaker (8a, 8b) is connected to each direct current output (4a, 4b) of the mains rectifier (3) and that at least two electrical loads (2a, 2b) connected in parallel with each other are connected to the centre tap (9) between the circuit breakers (8a, 8b).
  3. Circuit arrangement according to one of the claims 1 or 2, characterised in that the mains rectifier (3) is designed as a PFC rectifier.
  4. Circuit arrangement according to one of the claims 1 to 3, characterised in that the second inverter(s) (10a, 10b) is/are pulse-width modulated.
  5. Circuit arrangement according to one of the claims 1 to 4, characterised in that the inverters (7, 10a, 10b) are designed as resonant output stages.
  6. Circuit arrangement according to one of the claims 1 to 5, characterised in that the intermediate circuit capacitor (5) is designed as a foil capacitor.
  7. Circuit arrangement according to one of the claims 1 to 6, characterised in that disposed between the electrical load(s) (2a, 2b) designed as gas discharge lamps and the centre tap (9) of the first inverter (7), in each case, is/are resonant circuits (12), and that the first inverter (7) can be operated to ignite the gas discharge lamps (2a, 2b) at a frequency (f3) which corresponds to the resonant frequency of the resonant circuit (12).
  8. Circuit arrangement according to claim 7, characterised in that the power unit (6) is designed as an inverter-igniter unit with six circuit breakers (8a, 8b; 11a, 11b, 11c, 11d), which is provided on the output side with four chokes (13a, 13b, 14a, 14b) and capacitors (15a, 15b, 16a, 16b), wherein the chokes (14a, 14b) connected to the centre tap (9) of the first inverter (7) comprise, together with the connected capacitors (16a, 16b), the resonant circuit (12).
  9. Circuit arrangement according to one of the claims 1 to 8, characterised in that the mains rectifier (3) and the power unit (6) are designed as mutually connectable and separable modules.
  10. Circuit arrangement according to claim 9, characterised in that the power unit (6) and the mains rectifier (3) are designed as identical power modules.
  11. Circuit arrangement according to one of the claims 1 to 10, characterised in that the output power of the circuit arrangement is steplessly controllable/ that the circuit arrangement can be switched to zero current.
  12. Circuit arrangement according to one of the claims 3 to 11, characterised in that each load comprises two lamps connected in series.
  13. Device (18) for emitting UV radiation, in particular for the polymerising of printing inks in a printing machine, having at least one, preferably at least two, UV high pressure gas discharge lamps (2a, 2b, 2c), with a ballast device (19), which is provided with a circuit arrangement (1) according to one of the claims 1 to 12.
  14. Device according to claim 13, characterised in that the device is provided with inputs (23) and/or outputs (24) for the input of control signals and/or for the output of measured values.
  15. Method for operating a circuit arrangement for controlling at least one electrical load (2a) with an alternating current at a first presettable frequency (f1), in particular for a high pressure gas discharge lamp and at least one second load (2b), comprising a mains rectifier (3) having an intermediate circuit capacitor (5) connected to the direct current output (4a, 4b), and a power unit (6) for generating the alternating current via one inverter per electrical load (2a, 2b), so that a first inverter (7) with two electronic circuit breakers (8a, 8b) which are switched alternately at a first preset frequency (f1) is assigned to the first electrical load (2a), characterised in that a further second inverter (10a, 10b) is assigned to each electrical load (2b) and that the second inverter (10) is operated at a frequency (f2) in the range of 20 kHz to 50 kHz and that the first inverter (7) is operated at a frequency (f1) of approximately 250 Hz.
  16. Method according to claim 15 for operating a gas discharge lamp as an electrical load, in particular a high pressure gas discharge lamp, characterised in that in order to generate an ignition impulse, the first inverter (7) is operated at a frequency (f3) which corresponds to the resonant frequency of a resonant circuit connected on the line side of the load (2a, 2b).
EP01810867A 2001-09-10 2001-09-10 Circuit device and method to produce UV rays Expired - Lifetime EP1296541B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE50111458T DE50111458D1 (en) 2001-09-10 2001-09-10 Circuit arrangement, device for emitting UV radiation and method for operating a Schaltungsandordung
EP01810867A EP1296541B1 (en) 2001-09-10 2001-09-10 Circuit device and method to produce UV rays
AT01810867T ATE345661T1 (en) 2001-09-10 2001-09-10 CIRCUIT ARRANGEMENT, DEVICE FOR EMITTING UV RAYS AND METHOD FOR OPERATING A CIRCUIT ARRANGEMENT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01810867A EP1296541B1 (en) 2001-09-10 2001-09-10 Circuit device and method to produce UV rays

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EP1296541A1 EP1296541A1 (en) 2003-03-26
EP1296541B1 true EP1296541B1 (en) 2006-11-15

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Publication number Priority date Publication date Assignee Title
DE10337378B4 (en) * 2003-08-13 2017-11-16 Xylem Ip Holdings Llc Electronic ballast
EP2088837B1 (en) * 2008-02-04 2011-06-01 Uviterno AG Method for operating a UV lamp

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US4481460A (en) * 1982-02-08 1984-11-06 Siemens Aktiengesellschaft Inverter with charging regulator having a variable keying ratio
US5225741A (en) * 1989-03-10 1993-07-06 Bruce Industries, Inc. Electronic ballast and power controller
GB2244608A (en) * 1990-04-23 1991-12-04 P I Electronics Pte Ltd High frequency drive circuit for a fluorescent lamp

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