EP0265431A1 - Circuit pour l'amorcage et le fonctionnement d'au moins une lampe a decharge de faible ou de haute pression avec oscillations a frequence elevee - Google Patents

Circuit pour l'amorcage et le fonctionnement d'au moins une lampe a decharge de faible ou de haute pression avec oscillations a frequence elevee

Info

Publication number
EP0265431A1
EP0265431A1 EP19860904110 EP86904110A EP0265431A1 EP 0265431 A1 EP0265431 A1 EP 0265431A1 EP 19860904110 EP19860904110 EP 19860904110 EP 86904110 A EP86904110 A EP 86904110A EP 0265431 A1 EP0265431 A1 EP 0265431A1
Authority
EP
European Patent Office
Prior art keywords
transistor
circuit arrangement
gas discharge
arrangement according
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19860904110
Other languages
German (de)
English (en)
Inventor
Horst Erzmoneit
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.)
WOLF Karl
Original Assignee
WOLF Karl
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
Priority claimed from DE19853526230 external-priority patent/DE3526230A1/de
Priority claimed from DE19853541556 external-priority patent/DE3541556A1/de
Application filed by WOLF Karl filed Critical WOLF Karl
Publication of EP0265431A1 publication Critical patent/EP0265431A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H05B41/26—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
    • H05B41/282—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
    • H05B41/2825—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 by means of a bridge converter in the final stage

Definitions

  • Circuit arrangement for starting and for operating at least one low-pressure or high-pressure gas discharge lamp with high-frequency vibrations
  • the invention relates to a circuit arrangement for starting and operating at least one low-pressure or high-pressure gas discharge lamp with high-frequency vibrations.
  • a circuit arrangement for gas discharge lamps with fluorescent excitation arranged in series which contains a high frequency generator which is connected to the network via a rectifier bridge circuit and has a plurality of gas discharge lamps connected in series.
  • the high frequency generator contains a transistor which is arranged in series with a transformer.
  • the transformer has several windings, one of which is arranged in the emitter circuit, one in the base circuit and others each between the electrodes of the fluorescent lamps.
  • a tap of the transformer is connected via a capacitor to the electrode of a fluorescent lamp (DE-OS 28 55 820).
  • the invention is based on the object of developing a circuit arrangement for starting and operating at least one low-pressure or high-pressure gas discharge lamp with high-frequency vibrations, which enables reliable ignition and high operating frequencies with good efficiency with the least possible outlay.
  • the circuit indicated does not require a complicated transformer with numerous windings.
  • the vibrations for the operation of the lamp are generated with a choke in connection with capacitors.
  • a control transformer is provided for the contactless switches, which has a low output and therefore small dimensions can be arranged on a circuit board together with the other components.
  • the contactless switching elements are transistors, with the bases of which one of the windings and resistors are connected, the second ends of which are each connected to the emitters of the transistors.
  • This arrangement is characterized by a particularly simple structure.
  • a switch which is connected to a measuring element, is preferably arranged in series with the respective gas discharge lamp. Via which the switch can be switched on with a time delay after the operating voltage has been applied. With this arrangement, the discharge lamp is first switched on in the resonant circuit. if the capacitors have already assumed a charging voltage. When the switch is actuated, an oscillation begins. through which the electrodes of the gas discharge lamp are preheated until the gas discharge lamp ignites.
  • the start circuit preferably contains the series circuit of a resistor and a capacitor which are arranged between the poles of an operating voltage source, a DIAC being arranged between the connection point of the capacitor and the resistor and the base of the transistor connected to the negative pole of the operating voltage source.
  • each transistor is assigned a separate winding of the transformer for basic control. With this arrangement, the respective transistor is switched on safely and quickly.
  • the time delay that can be generated by the measuring element is preferably adapted to a cooling time of the gas discharge lamp. This avoids difficulties that occur when starting very strongly heated gas discharge lamps.
  • the windings for the transistors and the winding of the control transformer are combined with the inductance of the respective gas discharge lamp. This arrangement requires few components. It is therefore particularly economical to manufacture.
  • the frequency of the oscillation can preferably be adjustable for changing the intensity of the light generated by the gas discharge lamp.
  • a particularly favorable embodiment is designed such that at least one gas discharge lamp in series with an inductor and a capacitor between a pole of an operating voltage source and the common connection point two diodes connected in series, to each of which a transistor is connected in series, that the series connection of the transistors and the diodes is arranged between the poles of the operating voltage source and that the emitter of one transistor and the collector of the other transistor is connected to a circuit for deriving the current after blocking the respective transistor.
  • This circuit arrangement it is prevented that both transistors are conductive at the same time. This prevents short circuits across the two transistors. Since it can be determined as soon as one transistor changes from the conductive to the non-conductive state, the circuit can be designed in such a way that the other transistor is immediately turned on.
  • the frequency of the arrangement can thus be increased, which results in a reduction in the components of the oscillation circuit.
  • the emitter of one transistor and the collector of the other transistor are each connected via a resistor to a pole of the operating voltage source, a measuring element being connected to the emitter and the collector, by means of which, after the respective transistor is switched off when the current crosses zero or later, the each other transistor can be enabled for the application of switch-on signals.
  • the measuring elements control the switching on and off of the transistors.
  • a favorable embodiment consists in that the emitter of one transistor is connected via the series connection of a diode and a transistor to a connection of a capacitor, the other connection of which is connected to the one pole of the operating voltage source, so that the collector of the other Ren transistor connected via the series circuit of a diode and a transistor to a terminal of a capacitor is. whose other connection is connected to the other pole of the operating voltage source, and that a diode is arranged between the capacitors and the capacitor in series with the gas discharge lamp.
  • Several transistors can be connected in parallel. The arrangement can be used to feed several gas discharge lamps of the same or different wattages.
  • a detector is preferably connected to the emitter of one transistor and to the collector of the other transistor via a level monitoring arrangement, the detector being followed by a counter which can be reset to a preset value and which, depending on the count, is always one or releases the other transistor for control pulses.
  • FIG. 1 shows a first circuit arrangement for starting and operating a low-pressure or high-pressure gas discharge lamp.
  • FIG. 2 shows a second circuit arrangement for starting and for operating a plurality of low-pressure or high-pressure gas discharge lamps. - 6 -
  • FIG. 3 shows a third circuit arrangement for starting and for operating a plurality of low-pressure or high-pressure gas discharge lamps
  • FIG. 4 shows a fourth circuit arrangement for starting and operating a plurality of low-pressure or high-pressure gas discharge lamps
  • FIG. 5 shows a fifth circuit arrangement for starting and operating a low-pressure or high-pressure gas discharge lamp
  • FIGS. 1, 2 and 4 show a transformer for feeding transistors used in the arrangements according to FIGS. 1, 2 and 4,
  • Fig. 7 shows a sixth circuit arrangement for starting and for operating low-pressure or high-pressure gas discharge lamps.
  • FIG. 8 shows a seventh circuit arrangement for starting and operating low-pressure or high-pressure gas discharge lamps.
  • FIG. 9 shows a circuit arrangement for the operation of gas discharge lamps with high frequencies and high efficiency.
  • 10 shows another circuit arrangement for the operation of gas discharge lamps with high frequencies and high efficiency
  • 11 shows a further circuit arrangement for the operation of gas discharge lamps with high efficiency at high frequencies
  • Fig. 12 shows an additional circuit arrangement for the operation of gas discharge lamps at high frequencies with high efficiency.
  • a resistor 3 arranged in series with a capacitor 4.
  • two transistors 5, 6 are arranged with their collector-emitter paths in series between the poles 1 and 2.
  • the emitter of transistor 5 is connected to the collector of transistor 6.
  • the base of transistor 5 is connected to the emitter via a winding 7 of a transformer.
  • the base of the transistor 6 is connected to the emitter via a winding 8 of the transformer.
  • a third winding 9 of the transformer is connected to the emitter of the transistor 5 and to a choke 10, to which a low-pressure gas discharge lamp 11 is connected in series, the electrodes of which are not identified in more detail are connected to a capacitor 12.
  • a switch 13 is arranged in series with the gas discharge lamp 11 and is optionally replaced by a short circuit 20.
  • a capacitor 15 is connected to the switch 13, the second connection of which is connected to the pole 2.
  • Another capacitor 18 is arranged between the pole 1 and the switch 13.
  • Resistors 22 and 16 are arranged between the bases and the emitters of transistors 5 and 6, respectively. Via the common connection point of the resistor 22 and the condenser sator 4, a diode 17 is connected, the cathode of which is connected to the emitter of transistor 5. The parallel connection of a capacitor 19 and a resistor 21 is arranged between the emitter of the transistor 5 and the common connection point of the capacitors 15 and 18. A DIAC 23 connects the capacitor 4 to the base of the transistor 6. The switch 13 is controlled by a measuring element 14.
  • the capacitors 15 and 19 are charged.
  • the resistor 3 and the capacitor 4 form an RC circuit.
  • the voltage across capacitor 4 gradually increases.
  • the DIAC 23 ignites and thereby controls the transistor 6, which in the event of a short circuit 20 causes the capacitor 15 to discharge via the capacitor 12, the choke 10 and the winding 9.
  • the discharge current induces opposite voltages in the windings 7 and 8, one of which controls the transistor 6 in a non-conductive manner and the other controls the transistor 5 in a conductive manner.
  • a current flow in the opposite direction is thus generated via the transformer 9 and the inductor 10. This creates vibrations.
  • the gas discharge lamp 11 ignites.
  • the measuring element 14 switches the switch 13, the gas discharge lamp 11 being connected to voltage. After the lamp is switched on, a current flows through the winding 9 and the choke 10 to the gas discharge lamp 11, the electrodes being preheated via the capacitor 12. A voltage is induced in the winding 8 by the current flow through the winding 9, which voltage controls the transistor 6 via the capacitor 15 and the DIAC 23.
  • the windings 7, 8 and 9 are located on a core 26 of the transformer.
  • two transistors 27, 28 with their emitter-collector paths are connected in parallel with transistor 6.
  • the transistors 6, 27 and 28 are connected together with their bases to the winding 8 and the resistor 16.
  • Further gas discharge lamps 29 with chokes 30 are connected in parallel with the gas discharge lamp 11 with the choke 10.
  • the transistors connected in parallel allow greater power.
  • the gas discharge lamps 11 and 29 are switched off by the switch 13. sets ignited.
  • transistors 5, 2 ' 4 25 or 6, 27, 28 connected in parallel each of which is supplied with base currents via its own winding 7, 31, 32 or 8, 33, 34.
  • External emitter base resistors such as resistors 16 and 22 are also provided for transistors 24, 25, 27, 28, but are not shown in detail.
  • the coupling or parallel connection of transistors according to FIG. 3 results in a greater switching capacity in high-frequency operation for fluorescent lamps.
  • the gas discharge lamps 11 and 29 are ignited via the switch 13.
  • the transistor stages are controlled via the winding 9, via which one or more lamps can be operated.
  • gas discharge lamps 11, 29, 35, 36 and 37 of any size can be connected in parallel, the current limiting chokes 10, 30, 38, 39 and 40 and ignition capacitors 12, 41, 42, 43, 44 each of the lamp line are adapted.
  • the capacitor 19 must be designed accordingly.
  • the above-mentioned parts are preferably pluggable as modules, so that gas discharge lamps of the same or different power can be operated, for example, from a circuit for 400 watts by inserting the modules. Thanks to the two-stage activation, outputs of several 100 watts can be achieved.
  • the circuit arrangement shown in FIG. 5 is preferably used, which contains a high-pressure gas discharge lamp 45 which is connected to a choke 10.
  • the electrodes of the high-pressure gas discharge lamp 45 are connected to their own ignition device 46, which is controlled by a control device 47 fed with 220 volts.
  • a measuring element 48 controls both the switch 13 and the ignition device 46 and the control device 47.
  • the ignition device 46 When the circuit arrangement according to FIG. 5 is applied to the operating voltage, the ignition device 46 is also switched on. After the high-pressure gas discharge lamp 45 has ignited, the information that the switch 13 is switched on is transmitted via a line 49 from the measuring element 48 to the ignition device 46. The operation of the high-pressure gas discharge lamp 45 is thus started. After the switch 13 has switched on the gas discharge lamp 45, the ignition element is switched off by the measuring element 48 via a line 50. With this circuit arrangement, electronic ballasts for high-pressure lamps can be produced, which replace the heavy inductive ballasts previously used.
  • the circuit arrangements according to FIGS. 1 to 5 form ballasts which bring great energy savings in low and high pressure gas discharge lamps. Since high-pressure gas discharge lamps are predominantly used for street lighting, energy-saving ballasts can be provided with the circuit arrangements described, the power of the low-pressure and high-pressure gas discharge lamps being able to be regulated by changing the frequency.
  • the switch 13 can be a mechanical contact of a relay or an electronic switch, for example a TRIAC etc.
  • the two-stage activation also results in a lower network load as a single component. Since a certain cooling time is to be provided for high-pressure gas discharge lamps, this can be set in the measuring elements 14, 48, which after switching off z. B. only release the ignition of the lamp after the set time via lines 49 and 50.
  • the regulation of the power of the gas discharge lamps by means of frequency changes both in the case of low-pressure and in the case of high-pressure gas discharge lamps is advantageous for saving energy in the case of lighting and in radiation devices.
  • the circuit arrangements according to FIGS. 1 to 5 provide ballasts for UVA high-pressure lamps which, depending on the type of skin, can be set to certain irradiance levels. By doubling the voltage at the input of the circuit, it is possible to use the circuit arrangement to produce ballasts for low and high pressure gas discharge lamps for a 100 volt or 110 volt network area, the ignition voltage in the ignition element for high pressure gas discharge lamps being adapted accordingly, since the ignition in the high pressure range via a galvanically isolated Eündtrafo or capacitor.
  • a diode 51 is connected upstream.
  • a resistor 52 is arranged in front of the diode 17.
  • the capacitor 19 has no parallel resistance.
  • Between the base of the transistor 5 and the winding 7 is the series connection of two diodes 53, 54, one of which is connected in parallel with a resistor 56 and a capacitor 57.
  • the cathode of the diode 53 is connected to the winding 7.
  • the base of the transistor 6 is preceded by a circuit of the same construction, which contains the diodes 58, 59, the resistor 60 and the capacitor 61. Otherwise, the circuit according to FIG. 7 corresponds to that of FIG. 1.
  • control windings 62, 63 for the transistors 5 and 6 are already arranged on the inductor 10, which contains the winding 9. This saves a separate control transformer.
  • Another gas discharge lamp 64 can optionally be connected to the gas discharge lamp 11 in tandem.
  • a transistor 65, a diode 66, a further diode 67 and a transistor 68 are arranged in series between the poles 1, 2 of a DC voltage source.
  • the transistors 65 and 68 are with see their collector-emitter paths in series connection.
  • the emitter of transistor 65 is connected to the anode of diode 66.
  • the cathode of the diode 67 is connected to the collector of the transistor 68.
  • Free-wheeling diodes 69 and 70 are connected in parallel to the respective series connection of a transistor 65 and a diode 66 or the transistor 68 and the diode 67.
  • a circuit branches off from the cathode of the diode 66 and contains two gas discharge lamps 72 connected in parallel, each with a choke 71, which are connected together to a capacitor 73 connected to its " ground " .
  • the base of the transistor 65 is connected to the parallel connection of a resistor 74 and a diode 75.
  • the parallel connection of these two elements is connected to a control winding 76 which is connected via a further resistor 77 to the pole 2 of the operating voltage source, which is the ground potential
  • a measuring element 78 is connected to the emitter of transistor 65.
  • the emitter is also connected to the common junction of winding 76 and resistor 77.
  • the base of the second transistor 68 is likewise connected to a resistor 79 and to a diode 80 in parallel connection.
  • a control winding 81 is connected to this parallel circuit and to ground potential.
  • a resistor 82 connected to positive potential and a measuring element 83 are connected to the cathode of transistor 68.
  • the measuring elements 78 and 83 are preferably voltage detectors which determine, via a corresponding voltage level at the emitter or collector of the transistors 65 and 68, whether the current flow through the transistors 65, 68 has decayed.
  • High-frequency ballasts corresponding to the known state of the art are relatively expensive and have a limited output, since when the respective transistors operating in push-pull mode are switched off, short-circuits, which limit the output, occur briefly due to overlapping of the switch-on states.
  • the resulting short-circuit currents are dependent on the power to be switched, so that the high-frequency power cannot be produced inexpensively for currents which are greater than 0.2 amperes if the frequency is above 10 kHz and with a transistor stage powers of about 60 watts to be switched.
  • the transistors 65 and 68 are supplied in a push-pull manner with high-frequency vibrations via the control windings 76, 81 in the manner specified above.
  • the measuring element 78 only releases the activation of the transistor 68 when no more current flows through the emitter of the transistor 65.
  • the measuring element 83 only releases the transistor 65 when no more current flows in the collector circuit of the transistor 68.
  • the transistor 68 which switches after the negative pole of the operating voltage, is only switched on by the frequency generator when the frequency generator has received the signal from the measuring element that the electrons have flowed between the emitter of the transistor 65 and the cathode of the diode 66. After the transistor 68 has a blocking potential applied, electrons flow via the resistor 82.
  • the measuring element 83 is used to check whether current still flows between the collector of the transistor 68 and the anode of the diode 67.
  • the transistor 65 which switches to the positive operating potential, is only switched on by the frequency transmitter when it is determined by the measuring element 83 that no more current flows through the emitter. A short-circuit current through the flowing electrodes is therefore avoided with this circuit arrangement.
  • FIG. 10 shows a circuit in which the emitter of transistor 65 is connected via a diode 84 in series with the collector-emitter path of a transistor 85 to a capacitor 86, the other end of which is connected to ground potential.
  • the collector of transistor 68 is connected via a diode 87 in series with the emitter-collector path of a transistor 88 to a capacitor 89, the other end of which is connected to positive operating potential.
  • the collector of the transistor 88 is connected via a diode 90 to the capacitor 73, to which a gas discharge lamp 72 is connected upstream via the choke 71.
  • a diode 91 connects the capacitor 86 to the capacitor 73.
  • the transistors 65 and 68 are switched in such a way that a short-circuit current could flow if the electrons at the emitter of the transistor 65 and at the collector of the transistor 68 did not flow out before the switching through.
  • the additional transistors 85 and 88 By switching on the additional transistors 85 and 88, the existing ones Electrons are diverted into capacitors 86 and 89.
  • the electrodes between the emitter of transistor 65 and the collector of transistor 68 are therefore derived in order to avoid a short-term short circuit at high frequency.
  • the transistor 65 is switched on at the predetermined frequency, as a result of which a current of the voltage of +310 volts flows via the diode 66 and via the gas discharge lamp 72 and via the chokes 71 to the capacitor 73.
  • transistor 65 When transistor 65 is blocked, transistor 68 is switched on. Here, the electrons flow from the emitter of transistor 65 to capacitor 86. The current flow from the capacitor 86 via the gas discharge lamps 72 is blocked via the diode 66. After the transistor 68 is turned on, it is turned off again after a certain time. The discharge current from the capacitor 73 flows via the chokes 71 and the gas discharge lamp 72 and via the transistor 68 to the negative potential, the capacitor 86 also being discharged via the lamp path.
  • Electrons are again present between the emitter of transistor 65 and the collector of transistor 68 when transistor 65 has blocked. After blocking transistor 65, transistor 68 is switched on, which allows the electrons to flow to capacitor 89. For the next period, transistor 68 turns off when transistor 65 turns on again, and capacitor 89 is discharged through diode 90.
  • the electrons are derived between the switch-on times of the transistors 65 and 68, as a result of which a power-reducing short-circuit current is prevented.
  • switching elements which are shown in FIG. 11 as transistors, can be connected in parallel.
  • Transistors 92, 93, 94, 95 that switch after positive operating potential and transistors 96, 97, 98, 99 that switch after negative operating potential are shown in FIG. 11.
  • the transistors 92 to 95 connected in parallel are connected with the emitters to the cathode of the diode 66.
  • the resistor 77 and the measuring element 78 are arranged between the emitters of the transistors 92 to 95 and the cathode of the diode 66.
  • the transistors 96 to 99, which switch to negative operating potential, are connected in parallel with the collectors to the anode of the diode 67.
  • the resistor 82 and the measuring element 83 are provided between the collectors and the anode of the diode 67.
  • the measuring elements 78 and 83 are used to check whether the transistors 65 and 68 are blocked. After the transistors 92 to 95 have been switched off, the path between the emitters of the transistors 92 to 95 and the diode 66 is switched to the negative potential via the resistor 77. The measuring element 78 measures whether the path still has a positive potential. If the measuring element 78 no longer measures a positive charge in the path, it gives the frequency transmitter a signal to switch on the transistors 92 to 95. The control function of the measuring element 83 for the transistors 96 to 99 takes place for reverse potentials.
  • the circuit arrangement according to FIG. 11 monitors whether all transistors connected in parallel are blocked. Thus, in this circuit for the power, a plurality of switching elements, shown as transistors in FIG. 11, can be connected in parallel.
  • the clock frequency of the pulse generator for the circuit can be selected to be very high, since the switching frequency is not impaired by the clearing of the current.
  • transmitters 100, 101 are each provided for driving the bases of the transistors 65, 68.
  • the transmitters 100, 101 are controlled by frequency stages 102, 103.
  • resistors 77, 82 are present.
  • the resistor 77 is connected to a detector 115, the output of which is connected to a counter 104.
  • the counter 104 is over a. delete element 105 monitoring a predeterminable count can be reset.
  • a differential amplifier 106 is supplied with a reference voltage via a first voltage divider 107.
  • a second voltage divider 108 contains the series connection of three resistors 109, 110, 111, of which the first tap between the resistors 109 and 110 with the resistor 82 and the second tap between the resistors 110 and 111 is connected to the non-inverting input of the differential amplifier 106.
  • the power transistors 65 and 68 are driven via the transformers 100 and 101.
  • transistor 65 the electrons are withdrawn via resistor 77 after transistor 68 has been switched off.
  • detector 115 determines that the emitter of transistor 65 is negative, a pulse is applied to counter 104.
  • the counter 104 counts one step and gives the switching information via a line 112 to the frequency stage 103, via the transmitters 100 and 101 turn the transistors on and off.
  • transistor 68 is switched off, the potential is measured via resistor 82.
  • the information is given to the detector 115 via the differential amplifier 106 that the current flow has ended.
  • the detector 115 thus outputs a further pulse to the counter 104, which increases the count content by one step.
  • the counter 104 is reset to zero via the erase element 105.
  • the transistor 65 is switched on and off via the frequency stage 102 and the transformer 100. Then the process starts again.
  • the counter 104 prevents damage to the components when the lamps are removed during operation due to uncontrolled switching etc. It also stabilizes the frequency of the vibration.
  • the disturbing vibrations occurring in the circuit are damped via capacitors 113 and 114. Such disturbing vibrations load the transistors 65 and 68 as peak currents. Such attenuation allows higher powers in the high-frequency range to be conducted via the transistors 65 and 68.
  • the power limiting choke is to be matched to the respective gas discharge lamp.
  • This technique is therefore suitable for an economical modular construction, in which the high-frequency supply part is designed for maximum power, but the current limiting choke is assigned to the respective lamp. For example, you can use sun beds with a high-frequency module for 1500 watts for 12 x 100 watts UVA lamps and for 11 x 25 watts UVA lamps.
  • the respective module should operate one or more lamps. If light chains with fluorescent lamps are installed in workshops, department stores etc., it is more economical to operate several lamps from one module, whereby the current limiting choke is plugged into the module on the same socket.
  • a ballast can be manufactured for high-frequency ballasts of low-pressure gas discharge lamps, which can be operated by changing the current limiting choke with any lamp power, both of the same and different sizes.
  • a module of eg 230 watts can supply four lamps of 28 watts each.
  • the existing chokes in the conventional duo circuit should be exchanged for a high-frequency choke with a capacitor module.
  • the existing glow starters are replaced by capacitor-resistor combinations set in the start detection. You can therefore convert existing lamps to energy-saving technology without time-consuming re-installation.
  • the switching frequency changes in the event of voltage fluctuations. In the event of undervoltage, the switching frequency is reduced, causing a higher current to flow, which keeps the power almost constant.
  • the intensity of the light or UVA radiation in sun loungers can be influenced with a frequency change set from the outside. In sun loungers, the radiation intensity can therefore be adapted to the tolerance of the respective human body.
  • Fig. 6 shows the windings 7, 8 and 9 of the above-mentioned transformer, which are wound on two cores.
  • Each core contains one of the windings 7 and 8, while the winding 9 is wound on both cores.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

Circuit pour l'amorçage et le fonctionnement d'au moins une lampe à décharge (11) de faible ou de haute pression, à oscillations à fréquence élevée, dans lequel la lampe (11), au moyen d'un filtre (10) et d'au moins un condensateur (19), est reliée en série à travers l'enroulement (9) d'un transformateur au point de connexion commun des deux transistors (5, 6), disposés en série entre les pôles (1, 2) d'une source de tension de fonctionnement. Les transistors (5, 6) peuvent être enclenchés et déclenchés à travers d'autres enroulements (7, 8) par fonctionnement en push-pull. Un circuit d'amorçage est prévu pour le système.
EP19860904110 1985-07-23 1986-07-23 Circuit pour l'amorcage et le fonctionnement d'au moins une lampe a decharge de faible ou de haute pression avec oscillations a frequence elevee Withdrawn EP0265431A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3526230 1985-07-23
DE19853526230 DE3526230A1 (de) 1985-07-23 1985-07-23 Hochfrequenz-vorschaltgeraet fuer niederdruckentladungslampen beliebiger leistungen
DE3541556 1985-11-25
DE19853541556 DE3541556A1 (de) 1985-11-25 1985-11-25 Schaltungsanordnung zum starten und betreiben von niederdruck- und hochdruckentladungslampen

Publications (1)

Publication Number Publication Date
EP0265431A1 true EP0265431A1 (fr) 1988-05-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860904110 Withdrawn EP0265431A1 (fr) 1985-07-23 1986-07-23 Circuit pour l'amorcage et le fonctionnement d'au moins une lampe a decharge de faible ou de haute pression avec oscillations a frequence elevee

Country Status (2)

Country Link
EP (1) EP0265431A1 (fr)
WO (1) WO1987000719A1 (fr)

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GB8829844D0 (en) * 1988-12-21 1989-02-15 Yazdanian Sirous Control of fluorescent lights etc
GB2274220A (en) * 1992-12-24 1994-07-13 Luminaire Systems Limited Electronic ballast for fluorescent lamps

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WO1987000719A1 (fr) 1987-01-29

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