EP2380409B1 - Detektorschaltung und verfahren zur ansteuerung einer leuchtstofflampe - Google Patents

Detektorschaltung und verfahren zur ansteuerung einer leuchtstofflampe Download PDF

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Publication number
EP2380409B1
EP2380409B1 EP09752813A EP09752813A EP2380409B1 EP 2380409 B1 EP2380409 B1 EP 2380409B1 EP 09752813 A EP09752813 A EP 09752813A EP 09752813 A EP09752813 A EP 09752813A EP 2380409 B1 EP2380409 B1 EP 2380409B1
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EP
European Patent Office
Prior art keywords
voltage
input signal
fluorescent lamp
input
detector 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.)
Not-in-force
Application number
EP09752813A
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German (de)
English (en)
French (fr)
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EP2380409A2 (de
Inventor
Richard Pfaller
Jürgen Klier
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Osram GmbH
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Osram GmbH
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Priority to PL09752813T priority Critical patent/PL2380409T3/pl
Publication of EP2380409A2 publication Critical patent/EP2380409A2/de
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Publication of EP2380409B1 publication Critical patent/EP2380409B1/de
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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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • 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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
    • 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
    • H05B41/295—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 with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2988—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • 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

Definitions

  • the invention relates to a detector circuit, an electronic ballast and a method for controlling at least one fluorescent lamp.
  • a possible cause of failure of fluorescent lamps is a reduced emissivity of the electrodes (so-called "end-of-life” effect). This effect occurs at the end of the life of a fluorescent lamp on one of the two electrodes. As a result, the discharge current through the lamp flows more easily in one direction than in the opposite direction.
  • the fluorescent lamp works in this case as a rectifier. In doing so, the emission-impoverished electrode heats up so much that high temperatures can occur at the lamp surface. In extreme cases, the glass bulb can melt in fluorescent lamps of small diameter.
  • An electronic ballast (ECG) to control the fluorescent lamp must detect this one such fault in time and either limit output current and output voltage to a non-critical value or turn off the fluorescent lamp.
  • the TOE must fulfill various control and monitoring tasks beyond the actual lamp operation. Separate circuit parts are required for such control and monitoring tasks, in particular depending on the wiring of the electronic ballast.
  • WO-A2-2005 / 101921 discloses an end-of-life detection of a fluorescent lamp in the operating phase, wherein a detection signal is used and the lamp is switched in the lamp-to-ground topology.
  • the object of the invention is to avoid the above-mentioned disadvantages and in particular an approach for an efficient and flexible electronic To provide ballast or a versatile detector circuit for controlling a lamp that perceives, for example, depending on the wiring control and / or monitoring tasks.
  • the start-up phase is, in particular, a period of time before the activation of the at least one fluorescent lamp.
  • a drive may e.g. by means of a half-bridge circuit (or by means of a half-bridge inverter), by means of a full-bridge circuit or by means of a push-pull circuit.
  • the first predetermined voltage is preferably smaller than the second predetermined voltage.
  • the activation of the at least one fluorescent lamp takes place-directly or indirectly (eg via the at least one half-bridge inverter) -in the event that the first and the second signal each lie in an interval between the first predetermined voltage and the second predetermined voltage.
  • At least one coil of the at least one fluorescent lamp can be detected, wherein the detector circuit in different ECG topologies ("lamp-to-ground” or “Capacitor-to-ground” circuits) and in particular in combination with a fluorescent lamp or with two fluorescent lamps can be used.
  • the upper threshold corresponding to a high voltage (e.g., greater than the second predetermined voltage) on at least one of the two inputs may be equivalent to a high current flow in the detector circuit.
  • the detector circuit may have a current source which, in accordance with such a high voltage, loads a supply voltage of the detector circuit such that activation of the at least one fluorescent lamp can no longer take place.
  • the high voltage at at least one of the two inputs alternatively or additionally corresponds to a high current, which is converted by the power source from the supply voltage and prevents activation of the at least one fluorescent lamp.
  • Another advantage of the present approach is that the detector circuit can be used flexibly and thus a large number of otherwise necessary circuit parts for control and monitoring tasks can be omitted.
  • the second predetermined voltage is predetermined by a power source.
  • the power source is a supply voltage depending on loaded at least one voltage at least one of the inputs.
  • the power source is designed as a controllable power source.
  • a development is that the detector circuit for driving the at least one fluorescent lamp before starting an electronic ballast is used.
  • the helix recognition is preferably used before an electronic ballast starts or before igniting a fluorescent lamp.
  • Another development is that no activation of the at least one fluorescent lamp, in particular via the at least one half-bridge inverter, takes place if during the start-up phase, the first signal or the second signal is greater than the second predetermined voltage is / or if the first signal or second signal is less than the first predetermined voltage is / are.
  • the coils were (still) not recognized correctly, the at least one fluorescent lamp is not yet activated, or waiting for the ECG in particular until the coils are contacted correctly.
  • the detector circuit can be used in a circuit with a fluorescent lamp or in a circuit with two fluorescent lamps.
  • the at least one fluorescent lamp in a Capacitor-to-Ground topology or in a lamp-to-ground topology is operable.
  • the detector circuit in different topologies, i. Connections of at least one fluorescent lamp to use.
  • the detector circuit derives the necessary behavior, or the required control and monitoring tasks, in both forms of wiring correctly.
  • start-up phase comprises a period for filament monitoring and / or a time duration for preheating the at least one fluorescent lamp. During this start-up phase, preparatory measurements and Monitoring be performed before it comes to the ignition of at least one fluorescent lamp.
  • the detector circuit can automatically detect whether it is used in one or the other case.
  • both comparisons voltage at the inputs approximately equal or voltages at the inputs can be significantly different (about a factor of 2)) or only one of the two measurements can be used to determine if a fluorescent lamp is connected or if two fluorescent lamps are connected are.
  • an inactive fluorescent lamp can be detected if, after the start-up phase, the first signal and / or the second signal lies or lie within a detection interval.
  • the fluorescent lamp is particularly inactive if it has not been ignited or extinguished.
  • the detection interval corresponds to a voltage interval in a range of approximately 2V to approximately 3V.
  • the above-mentioned reduction of the output voltage may also include the possibility that an activation of the at least one fluorescent lamp is omitted or the detector circuit and / or the electronic ballast is / are switched off.
  • comparators are provided for determining the voltage intervals.
  • a next embodiment is that by means of a microcontroller, the signals of the inputs can be determined.
  • the comparators with associated switching logic can be used to detect the threshold values.
  • at least one microcontroller possibly in conjunction with at least one analog-to-digital converter (A / D converter), can be used to detect the signals applied to the inputs and to evaluate them appropriately.
  • a / D converter analog-to-digital converter
  • the at least one fluorescent lamp can be controlled by means of at least one half-bridge via a voltage-controlled oscillator.
  • the at least one half-bridge or the voltage-controlled oscillator can be part of the detector circuit or part of the electronic ballast for operating the at least one fluorescent lamp.
  • the detector circuit may be a part of the electronic ballast or associated with this.
  • a development consists in that at least one input is connected to a controllable current source, wherein the controllable current source loads a supply voltage as a function of at least one voltage at at least one input.
  • the current source can load the supply voltage with a correspondingly high current, so that, for example, activation of the at least one fluorescent lamp does not occur due to the high voltage at the affected input (or can no longer occur).
  • detector circuit is formed at least partially in the form of an integrated circuit.
  • an electronic ballast for controlling at least one fluorescent lamp comprising a detector circuit as described herein.
  • the ECG in particular provides functions for dimming the at least one fluorescent lamp and for end-of-life detection.
  • On the basis of the detector circuit can be detected in time a fault in the operation of a fluorescent lamp and another Control of this lamp is omitted (ie the fluorescent lamp are switched inactive).
  • circuit arrangement can be used for end-of-life detection and for switching off the fluorescent lamp.
  • the above object is also achieved by a method for operating the detector circuit according to the embodiments made herein.
  • Fig.1 shows an example of a structure of a control circuit for controlling at least one fluorescent lamp.
  • Fig.1 comprises a plurality of comparators Comp11, Comp12, Comp13, Comp21, Comp22, Comp23, Comp31 and Comp32, the outputs of which are connected to a logic unit 101.
  • the logic unit 101 controls a voltage-controlled oscillator VCO 102, at the output of which two control signals LSG, HSG, for example for controlling electronic switches of a half-bridge circuit or of a half-bridge inverter, are provided.
  • the control circuit may be part of an end-of-life circuit, in particular an end-of-life detector circuit for operating and / or monitoring at least one fluorescent lamp.
  • the control circuit may be part of an integrated circuit that can be used to control an electronic ballast (ECG) or at least one half-bridge.
  • ECG electronic ballast
  • the control circuit according to Fig.1 has two inputs EOL1, EOL2, and an input for a supply voltage VCC.
  • the two inputs EOL1 and EOL2 are suitable for applying a voltage to or in connection with a Fluorescent lamp to detect.
  • the respectively detected per input EOL1 and / or EOL2 voltage can be suitably evaluated by the control circuit.
  • the control circuit according to Fig.1 is configured as follows:
  • the input EOL1 is connected to an input of the comparator Comp31, the other input of the comparator Comp31 is connected to a node 108.
  • the node 108 is connected via a resistor 106 to the input EOL2.
  • the node 108 is connected through a resistor 105 to ground.
  • the input EOL2 is connected to an input of the comparator Comp32 whose other input is connected to a node 109.
  • the node 109 is connected via a resistor 104 to ground and connected via a resistor to the input EOL1.
  • Input EOL1 is connected to one input each of comparators Comp11, Comp12 and Comp13.
  • the other input of the comparator Comp11 is at a potential of 3V
  • the other input of the comparator Comp12 is at a potential of 2V
  • the other input of the comparator Comp13 is at a potential of 0.5V.
  • the input EOL2 is connected to one input each of the comparators Comp21, Comp22 and Comp23.
  • the other input of the comparator Comp21 is at a potential of 3V
  • the other input of the comparator Comp22 is at a potential of 2V
  • the other input of the comparator Comp23 is at a potential of 0.5V.
  • the input EOL1 is connected to one input of a current source 107 and the input EOL2 is connected to another input of the Power source 107 connected.
  • the power source is further connected to the supply voltage VCC.
  • the supply voltage VCC is connected to the logic unit 101 via a Zener diode D1 and a Zener diode D2 is arranged between the supply voltage VCC and ground.
  • both inputs EOL1 and EOL2 or only one of the two inputs can be connected to the controllable current source 107, which charges the supply VCC depending on the voltages at the inputs EOL1 and EOL2.
  • the logic unit 101 is enabled to drive the VCO 102 when the supply voltage VCC exceeds a predetermined value.
  • the Zener diode D2 prevents further increase of this supply voltage VCC.
  • the fluorescent lamps shown need not be part of the electronic ballast, but preferably terminals (for example sockets) are provided which can be contacted with the fluorescent lamps.
  • Fig.2 shows an ECG with a fluorescent lamp in a "Capacitor-to-Ground" topology.
  • Fig.2 shows a circuit block 201, which is also found in the subsequent circuits and there is designated as circuit block 201.
  • circuit block 201 will be described below.
  • a supply voltage or intermediate circuit voltage VBus is connected between ground and a node 202.
  • the node 202 is connected to the drain terminal of an n-channel MOSFET Q1, its source terminal to a node HB and to the drain terminal of an n-channel MOSFET Q2 connected is.
  • the source terminal of the Mosfet Q2 is connected to ground.
  • the gate terminal of the MOSFET Q1 is connected to the output LSG of the control circuit 204, and the gate terminal of the MOSFET Q2 is connected to the output HSG of the control circuit 204.
  • the node HB is connected to a node 203 via a coil L1 and the node 203 is connected to ground via a capacitor C1.
  • the circuit block 201 is connected on the one hand to the control circuit 204 and on the other hand it is connected via the nodes 202 and 203 with the remaining circuitry.
  • the node 202 is connected via a resistor R11 to the input for the supply voltage VCC of the control circuit 204.
  • the node 202 is connected via a resistor R21 to a terminal 205 of the filament of the lamp Lamp1.
  • the other terminal 206 of the coil is connected via a resistor R22 to the input EOL1 and the input EOL1 is connected via a resistor R23 to ground.
  • the terminal 206 is connected to ground via a capacitor C2.
  • the node 202 is connected via a resistor R31 to the input EOL2 and the input EOL2 is connected via a resistor R32 to ground.
  • the node 203 is connected to a terminal 207 of a filament of the lamp Lamp1.
  • Figure 3 shows an ECG with two fluorescent lamps in a "Capacitor-to-Ground” topology.
  • circuit block 201 is provided with the two nodes 202 and 203.
  • the electronic ballast is shown as an example with two fluorescent lamps Lamp1 and Lamp2. These may be versions for inserting the fluorescent lamps.
  • the fluorescent lamps each have two coils each with two terminals.
  • the fluorescent lamp Lamp1 has terminals 301 and 302 for connection to a first coil, and terminals 303 and 304 for connection to a second coil.
  • the fluorescent lamp Lamp2 has terminals 305 and 306 for connection to a first coil and terminals 307 and 308 for connection to a second coil.
  • the node 202 is connected to the terminal 306 via a resistor R11, to the terminal 301 via a resistor R12, to the terminal 307 via a resistor R21, and to the terminal 303 via a resistor R31.
  • the node 203 is connected to the terminal 302, to the terminal 305 and via a resistor R13 to the input for the supply voltage VCC of the control circuit 204.
  • the terminal 304 is connected to a node 309 via the first coil of a transformer T1, and the terminal 308 is connected to a node 310 via the second coil of the transformer T1.
  • the node 309 is connected to ground via a capacitor C3. Furthermore, the node 309 is connected via a resistor R32 to the input EOL1, wherein the input EOL1 is connected via a resistor R33 to ground.
  • the node 310 is connected to ground via a capacitor C2. Furthermore, the node 310 is connected via a resistor R22 to the input EOL2, wherein the input EOL2 is connected via a resistor R23 to ground.
  • Figure 4 shows an ECG with a fluorescent lamp in a "lamp-to-ground" topology.
  • circuit block 201 is provided with the two nodes 202 and 203.
  • the node 202 is connected via a resistor R11 to the input for the supply voltage VCC of the control circuit 204.
  • the input of the supply voltage VCC is connected via a resistor R23 to a node 401 and via a resistor R33 to the input EOL2.
  • the input EOL2 is connected to ground via a resistor R34.
  • the node 203 is connected via a parallel connection of a resistor R21 and a capacitor C2 to a terminal 402 for a first filament of a fluorescent lamp Lamp1 and via a resistor R22 to the node 401.
  • the node 401 is connected to the input EOL1 and via a resistor R24 to a terminal 404 for a second one Spiral of the fluorescent lamp Lamp2 connected.
  • a terminal 403 for the second filament of the fluorescent lamp is connected to ground.
  • Figure 5 shows an ECG with two fluorescent lamps in a "lamp-to-ground" topology.
  • circuit block 201 is provided with the two nodes 202 and 203.
  • the electronic ballast is shown as an example with two fluorescent lamps Lamp1 and Lamp2. These may be versions for inserting the fluorescent lamps.
  • the fluorescent lamps each have two coils each with two terminals.
  • the fluorescent lamp Lamp1 has terminals 501 and 502 for connection to a first coil, and terminals 503 and 504 for connection to a second coil.
  • the fluorescent lamp Lamp2 has terminals 505 and 506 for connection to a first coil and terminals 507 and 508 for connection to a second coil.
  • the node 202 is connected via a resistor R11 to the input for the supply voltage VCC of the control circuit 204.
  • the input for the supply voltage VCC of the control circuit 204 is connected via a resistor R23 to the input EOL1 and via a resistor R33 to the input EOL2.
  • the node 203 is connected in parallel with a resistor R31 and a capacitor C3 with a node 510 and connected via a parallel connection of a resistor R21 and a capacitor C2 to a node 509.
  • the node 509 is connected via a resistor R22 to the input EOL1.
  • the node 510 is connected to the input EOL2 via a resistor R32.
  • the node 509 is connected to the terminal 502 via a first coil of a transformer T1.
  • the node 510 is connected to the terminal 506 via a second coil of the transformer T1.
  • the input EOL1 is connected to the terminal 503 via a resistor R24 and the input EOL2 is connected to the terminal 508 via a resistor R34.
  • the two terminals 504 and 507 are connected to ground.
  • the potential of this coil is further divided down and fed to an EOL input, that the voltage at this EOL input in the operation of the ECG is above 2V when the lamp is not burning (in this case, the resistance of the lamp is infinitely large) and under 2V drops when the lamp is lit (in this case, the lamp resistance is in a range of 100 ⁇ to 100 ⁇ , for example).
  • the input EOL2 is connected to a voltage divider that divides a fixed voltage so that when operating at high lamp power (resistance of the lamp, for example, in a range of 100 ⁇ to 1k ⁇ ), both inputs EOL1 and EOL2 will have (approximately) the same input voltage.
  • the intermediate circuit voltage Vbus is used, because the voltage at the input EOL1 also depends on the intermediate circuit voltage Vbus. Accordingly, in the circuit according to Figure 4 divided the supply voltage VCC, because here the voltage at EOL1 depends on this supply voltage VCC.
  • the electrical continuity of at least one of the two lamp filaments is controlled: If the filament is interrupted, the switch-off function can be reset, and the ECG can be started again if the filament is turned again.
  • the electronic ballast does not start if the lamp is only inserted on one side into a socket on which ignition voltage is generated. Otherwise, if the terminals on the other side of the lamp are touched, the lamp would ignite and could cause an electric shock.
  • the ignition voltage is generated on a socket which is connected to the resonant circuit (L1, C1).
  • the resonant circuit L1, C1
  • T1 transformer
  • the respective lamp sockets opposite these sockets are preferably tested for electrical continuity.
  • the helical interrogation is preferably carried out before or at the start of the TOE.
  • the half-bridge transistors (Q1, Q2) are not yet activated
  • the intermediate circuit voltage (Vbus) is, for example, in a range of 176V to 375V depending on the mains voltage.
  • the lamps (Lamp1, Lamp2) are not yet burning (i.e., the resistance of the respective lamp is infinite).
  • the voltage at the inputs EOL1 and EOL2 is in the range of about 0.5V to about 3V.
  • the corresponding voltage at the inputs EOL1 and EOL2 in the circuits according to FIG Fig.2 and Figure 3 each 0V, in the circuits according to Figure 4 and Figure 5 the voltage at the inputs EOL1 and EOL2 is greater than 3V. In both cases (OV and greater than 3V), the TOE should not start. Only when the voltages at the inputs EOL1 and EOL2 are within a range of 0.5V to 3V, the electronic ballast starts.
  • the first column of the above table shows which inputs EOL1 and / or EOL2 the Meet conditions according to the second voltage.
  • the third column shows the cause and the fourth column comprises the reaction of the detector circuit or the ECG.
  • a special feature includes the circuit according to Figure 3 : Here it is advisable to monitor all four coils of both lamps.
  • the supply current of the control circuit via the resistors R11 and R12 and via both coils (terminals 301, 302 and 305, 306) of the resonant circuit lamp side out.
  • the resistors R11 and R12 may be made equal and twice as large as the resistor R13. If one of the two coils is missing, the supply current drops to 2/3 of its normal value. So that this small change can be evaluated with a large mains voltage range between 176V and 375V, the supply current of the control circuit is made independent of the mains voltage. This is achieved by the current source 107, which additionally loads the supply depending on the mains voltage (see Fig.1 and related description).
  • the ECG starts only when the remaining supply current of the control circuit does not fall below a certain minimum value (eg 150 ⁇ A).
  • the current source 107 is controlled either by the greater of the voltages at the inputs EOL1 and EOL2, which are respectively proportional to the intermediate circuit voltage VBus, or by the voltage at the input EOL1.
  • At least one missing filament of a fluorescent lamp can be detected in a lower and in an upper voltage range and thus the control circuit can be used universally for different ECG topologies ("lamp-to-ground” circuit, "Capacitor”). to-Ground “-Besciens).
  • the ECG must provide the required ignition voltage, depending on the lamp, up to 750V.
  • a non-burning lamp is detected by the fact that the voltage at the corresponding input EOL1 and / or EOL2 is more than 2V but less than 3V.
  • the ignition voltage of a lamp is almost doubled by the balancing transformer T1 when the other lamp is already burning.
  • the balancing transformer T1 is heavily loaded due to the high voltage and the high level of control of the core. Therefore, a reduction of the ignition voltage is appropriate for the duration of this condition.
  • the voltage at one of the inputs EOL1 or EOL2 is in a range of 0.5V to 2V
  • the voltage at the other input EOL2 or EOL1 is in a range between 2V and 3V (comparable to the case of the single-lamp ECG if this one lamp does not burn).
  • the control circuit is operated with one lamp or with two lamps. This can be determined, in particular, as long as no lamp is burning, ie during a preheating phase: in the case of the electronic ballast with one lamp, the voltages at the inputs EOL1 and EOL2 differ approximately by a factor of two, for the electronic ballast with two lamps Voltages at the inputs EOL1 and EOL2 during the pre-heating phase are approximately the same.
  • the determination of Voltages and their relation to one another can be determined by means of the control circuit, eg using the comparators Comp31 and Comp32 (see Fig.1 ) respectively.
  • the "normal operation" state can be detected by means of the voltages at the inputs EOL1 and EOL2, and both are then in the range of 0.5V to 2V.
  • a special burden for the electronic ballast is the hard rectifying operation as tested according to EN 61000-3-2.
  • the lamp is a diode connected in series and thus the coupling capacitor (C2, C3) heavily reloaded.
  • the electronic ballast can be relieved by increasing the operating frequency (far) above the resonance frequency of the output resonant circuit (L1, C1).
  • comparator thresholds can be used for the functions spiral detection, ignition control and monitoring of the output voltage. This simplifies the structure of the respective circuit. It is also possible to provide separate comparator thresholds for each functionality (or parts thereof).
  • a microcontroller with A / D converter can be provided, which evaluates the signals at the inputs EOL1 and EOL2 suitable and controls the at least one half-bridge or the at least one fluorescent lamp accordingly.

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  • Circuit Arrangements For Discharge Lamps (AREA)
EP09752813A 2009-01-16 2009-11-13 Detektorschaltung und verfahren zur ansteuerung einer leuchtstofflampe Not-in-force EP2380409B1 (de)

Priority Applications (1)

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PL09752813T PL2380409T3 (pl) 2009-01-16 2009-11-13 Obwód detekcyjny i sposób sterowania świetlówką

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009004852A DE102009004852A1 (de) 2009-01-16 2009-01-16 Detektorschaltung und Verfahren zur Ansteuerung einer Leuchtstofflampe
PCT/EP2009/065091 WO2010081571A2 (de) 2009-01-16 2009-11-13 Detektorschaltung und verfahren zur ansteuerung einer leuchtstofflampe

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EP2380409A2 EP2380409A2 (de) 2011-10-26
EP2380409B1 true EP2380409B1 (de) 2013-02-27

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EP09752813A Not-in-force EP2380409B1 (de) 2009-01-16 2009-11-13 Detektorschaltung und verfahren zur ansteuerung einer leuchtstofflampe

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US (1) US8754582B2 (ko)
EP (1) EP2380409B1 (ko)
KR (1) KR20110105003A (ko)
CN (1) CN102282915B (ko)
DE (1) DE102009004852A1 (ko)
PL (1) PL2380409T3 (ko)
WO (1) WO2010081571A2 (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009004851A1 (de) * 2009-01-16 2010-07-29 Osram Gesellschaft mit beschränkter Haftung Detektorschaltung und Verfahren zur Ansteuerung einer Leuchtstofflampe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19524185B4 (de) 1995-04-18 2009-01-29 Tridonicatco Gmbh & Co. Kg Gleichrichterschaltung
US5739645A (en) * 1996-05-10 1998-04-14 Philips Electronics North America Corporation Electronic ballast with lamp flash protection circuit
DE19837728A1 (de) 1998-08-20 2000-02-24 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb mindestens einer Entladungslampe
US6232727B1 (en) * 1998-10-07 2001-05-15 Micro Linear Corporation Controlling gas discharge lamp intensity with power regulation and end of life protection
FI106426B (fi) * 1999-03-31 2001-01-31 Innoware Oy Loistelamppujen liitäntälaite
JP3797079B2 (ja) * 2000-09-06 2006-07-12 松下電工株式会社 放電灯点灯装置
JP2003257688A (ja) * 2001-12-28 2003-09-12 Toshiba Lighting & Technology Corp 放電ランプ点灯装置及び照明器具
DE10209620A1 (de) 2002-03-05 2003-09-25 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh EOL-Erkennung mit integrieter Wendelabfrage
US7154232B2 (en) 2003-06-24 2006-12-26 International Rectifier Corporation Ballast control IC with multi-function feedback sense
JP4415686B2 (ja) * 2004-01-30 2010-02-17 ミツミ電機株式会社 負荷駆動制御装置
US7298099B2 (en) * 2004-04-08 2007-11-20 International Rectifier Corporation PFC and ballast control IC
US7902764B2 (en) * 2005-05-04 2011-03-08 Stmicroelectronics S.R.L. Control device for discharge lamp
ATE498989T1 (de) * 2007-03-29 2011-03-15 Osram Gmbh Schaltungsanordnung zur ansteuerung mindestens einer leuchtstofflampe
WO2009158334A2 (en) * 2008-06-26 2009-12-30 Osram Sylvania, Inc. Ballast with lamp-diagnostic filament heating, and method therefor

Also Published As

Publication number Publication date
WO2010081571A3 (de) 2011-01-06
US20110273096A1 (en) 2011-11-10
DE102009004852A1 (de) 2010-07-29
PL2380409T3 (pl) 2013-08-30
EP2380409A2 (de) 2011-10-26
CN102282915B (zh) 2015-05-20
WO2010081571A2 (de) 2010-07-22
CN102282915A (zh) 2011-12-14
US8754582B2 (en) 2014-06-17
KR20110105003A (ko) 2011-09-23

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