EP2230887B1 - Niederdruck-Beleuchtungsvorrichtung mit Hochdruckentladungslampe und Leuchte damit - Google Patents

Niederdruck-Beleuchtungsvorrichtung mit Hochdruckentladungslampe und Leuchte damit Download PDF

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Publication number
EP2230887B1
EP2230887B1 EP20100001589 EP10001589A EP2230887B1 EP 2230887 B1 EP2230887 B1 EP 2230887B1 EP 20100001589 EP20100001589 EP 20100001589 EP 10001589 A EP10001589 A EP 10001589A EP 2230887 B1 EP2230887 B1 EP 2230887B1
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EP
European Patent Office
Prior art keywords
discharge lamp
lamp
voltage
circuit
output
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Not-in-force
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EP20100001589
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English (en)
French (fr)
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EP2230887A1 (de
Inventor
Masanori Mishima
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Panasonic Corp
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Panasonic Corp
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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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
    • 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

Definitions

  • the amplifier 32 adjusts the variable AC voltage source 25 so as to decrease a difference between the signal from the current sensor 29 and the signal from the reference signal source 31, thereby decreasing magnitude of variation in the current in the fluorescent lamp LA and increasing an output impedance of the circuit.
  • the equivalent output impedance of this circuit is very high and actually much higher than the impedance of the resonance LC circuit 27 alone. It is assumed that the dimming circuit including a ballast 23 in this mode, which has an equivalent output impedance of about 35 k ⁇ can stably operate the compact fluorescent lamp at the luminous level less than about 1% of the level during rated lighting.
  • Fig. 22 is a circuit diagram of a second conventional example disclosed in Patent document 2 (Unexamined Patent Publication No. JP 2005-339972 ).
  • an AC power source Vs is inputted to a rectifying circuit 2 via a low-pass filter circuit 1 for rectification, a predetermined DC voltage is further obtained at a chopper circuit 3 and a smoothing capacitor C0 and a voltage between both ends of the smoothing capacitor C0 as a DC power source is supplied to a half-bridge inverter circuit 4.
  • output power of the discharge lamp LA is detected based on a voltage between both ends of the resistor Rs, the voltage between both ends is compared with a variable reference voltage Vref which determines a dimming level by an error amplifier EA forming a comparator of feedback means 5 and a voltage signal based on the difference is outputted as a feedback signal.
  • the frequency of a pulse signal from an oscillator 8a is modulated based on a voltage signal obtained by adding a control signal formed of a voltage signal from a pulse signal generator 7 to the feedback signal by an adding device 6.
  • a driver circuit 8b generates a gate signal for alternately turning on/off the switching elements Q1, Q2 based on an oscillating signal from the oscillator 8a.
  • a chopper control circuit 3a controls the chopper circuit 3 so that an output voltage of the chopper circuit 3 becomes a predetermined voltage.
  • a capacitor Cfb and a resistor Rfi constitute a delay element of the error amplifier EA.
  • a gain of the feedback means 5 is varied according to the dimming level.
  • the feedback means 5 can change over between a first feedback function to adjust the DC voltage outputted from the DC voltage source Vdc or turning-on/off of the switching elements Q1, Q2 so that the output of the calculating means 10 becomes substantially equal to the reference voltage Vdim and a second feedback function to adjust the DC voltage outputted from the DC voltage source Vdc or turning-on/off of the switching elements Q1, Q2 so that the output of the lamp current detecting means 13 becomes substantially equal to the reference voltage Vdim.
  • a thirteenth aspect of the present invention is an illumination fixture incorporating the low pressure discharge lamp lighting device according to any of the first to twelfth aspects of the present invention therein ( Fig. 18 ).
  • the optical output at the lower limit of dimming can be finely adjusted.
  • the gain need not be forcedly increased in the vicinity of a rating, divergence in the feedback means is hard to occur.
  • the lamp is more tolerant of going-out by increasing the gain as dimming is deeper.
  • control according to the present invention to be tolerant of going-out during dimming can be started after the lamp reliably starts.
  • the point When the point deviates from the intersection point, the point does not move to unlimitedly increase the value along the dotted line of the V-I characteristic of the ballast, but transit on a track of a resonance system (the chain line in this figure) in the open state at the time when it deviates. For example, when the point deviates at a point (b), the point moves upward along the line (C). Since this state is the same as a non-load state in the case where the feedback system is not used, it can be addressed by a conventional non-load detecting circuit such as a circuit detecting the lamp voltage and stopping oscillation.
  • Fig. 4 is a diagram for describing a dimming method using the dimmer 9.
  • the gradient (set value of R1a) of the ballast characteristic with respect to the origin is continuously varied by continuously varying the reference voltage Vdim in Fig. 1 by the dimmer 9 according to the above-mentioned control, resulting in that the dimming operation is also continuously performed.
  • This method is suitable especially to the case of varying the dimming level in an analog fashion.
  • a command value of the dimming level becomes discrete.
  • the dimming width in the vicinity of the dimming lower limit becomes smaller than the change width in the vicinity of the rating. For this reason, dimming in the vicinity of the dimming lower limit can be automatically adjusted with small intervals and going-out and jump of the lamp due to sudden change of the operating point hardly occurs.
  • f represents frequency.
  • This example shows specific control of starting of the hot cathode fluorescent lamp which includes sequence of preheating, starting and lighting.
  • the above-mentioned operation is the operation during lighting and preferably, is not performed prior to starting of the lamp. For this reason, before the lamp LA is started by application of a high voltage, the switch SW2 is turned off, thereby deactivating the feedback control is ensured, and after starting the lamp, the above-mentioned feedback operation is started by turning on the switch SW2 after detecting the lamp current is flowing.
  • (a) represents the on/off state of the switch SW2 and (b) represents the voltage applied to the lamp terminal.
  • a preheating current flows to the filament of the lamp, no lamp current flows.
  • the high voltage is applied to the lamp terminal discharge breakdown occurs in the lamp and the lamp current starts to flow.
  • the I1a detecting circuit 13 detects that the lamp current starts to flow, allowing the switch SW2 to be turned on. Operation after lighting is the same as described above.
  • Fig. 10 is a circuit diagram of a first embodiment according to the present invention. This configuration is different from the configuration shown in Fig. 1 in that a switch SW3 for selectively changing over between the output of the I1a detecting circuit 13 and the output of the calculating means 10 as the input of the feedback means 5 is provided and a circuit for changing over the switch SW3 according to the output of the dimmer 9 is added. Since the other portion is the same as the configuration shown in Fig. 1 , redundant description thereof is omitted.
  • This embodiment is an example in which a target for the feedback control is changed over according to the dimming level.
  • the lamps with the same rated current and different power can be lighted by the same inverter circuit and the above-mentioned circuit which is tolerant of going-out during dimming can be constituted.
  • the target for changing over is not limited to the feedback control to make the lamp current I1a constant and for example, may be changed over to the conventional feedback control to make the lamp power W1a constant. In this case, it is needed to separately add a circuit for calculating the lamp power W1a or a value proportional to the lamp power W1a.
  • the output of V1a detecting circuit 11 is also used to detect abnormality.
  • the circuit configuration can be simplified.
  • the abnormal detecting circuit 51 may weaken or stop an oscillating output of the inverter circuit 4.
  • V1a detecting circuit 11 is also used for abnormality detection in this embodiment, for example, abnormality may be detected based on the output of I1a detecting circuit 13 or on the values of both detecting circuits.
  • the oscillating output of the inverter circuit can be safely weakened or stopped in a no-load state or abnormal state due to divergence in the feedback means, while simplifying the circuit.
  • Fig. 13 is a circuit diagram of a third embodiment according to the present invention.
  • This embodiment is an example that going-out of the lamp caused by deviation of the operating point of the feedback control from the V-I characteristic of the lamp can be prevented in advance.
  • This configuration is different from the configuration shown in Fig. 1 in that an upper limiter circuit 52 is added to the output of the V1a/I1a calculating means 10. Since the other configuration is the same as the configuration shown in Fig. 1 , redundant description thereof is omitted.
  • a lower limiter circuit 53 may be provided at the output of the I1a detecting circuit 13.
  • the lower limiter circuit 53 has a function to limit the detected value of the Ila detecting circuit 13 so that the value becomes equal to or smaller than a predetermined lower limit value. Since the other configuration is the same as the configuration shown in Fig. 1 , redundant description thereof is omitted.
  • the V-I characteristic of the ballast and the V-I characteristic of the lamp reliably have the intersection point thereof, thereby preventing going-out due to deactivation of from the feedback control.
  • Fig. 16 is a circuit diagram of a fourth embodiment according to the present invention. This configuration is different from the configuration shown in Fig. 1 in that an output of an illuminance sensor 17 is superimposed on the output of the dimmer 9. Since the other configuration is the same as the configuration shown in Fig. 1 , redundant description thereof is omitted.
  • the optical output of the illuminance sensor 17 is corrected. According to the control explained in the first embodiment, when the V-I characteristic of the lamp changes due to, for example, ambient temperature characteristic of the lamp LA, the operating point consistently moves on the line of the V-I characteristic of the ballast.
  • Fig. 17(A) shows a relationship between the actual illumination intensity (horizontal axis) and the output of the illuminance sensor 17. As the illumination intensity is higher, the output of the illuminance sensor 17 becomes larger. On the contrary, as the illumination intensity is lower, the output of the illuminance sensor 17 becomes smaller.
  • a correcting signal of the illuminance sensor 17 is superimposed on the output of the dimmer 9. Since the signal superimposed on the output of the dimmer 9 becomes larger as the output of the illuminance sensor 17 is larger, control is made in the direction of further deepening dimming. According to this control, the illumination intensity is made constant. On the contrary, since the signal superimposed on the output of the dimmer 9 becomes smaller as the output of the illuminance sensor 17 is smaller and hence, the dimming level becomes shallower. According to this control, the illumination intensity is made constant.
  • illuminance sensor 17 Although use of the illuminance sensor 17 is described in this embodiment as an example, it is needless to say that use of a sensor is not limited to the illumination sensor and an output signal of the other sensor (for example, an ambient temperature sensor and the like) may be superimposed on the output of the dimmer 9.
  • an output signal of the other sensor for example, an ambient temperature sensor and the like
  • Fig. 18 shows appearance of an illumination fixture which mounts the low pressure discharge lamp lighting device according to any of the previous embodiments thereon.
  • the illumination fixture 40 includes a fixture main body 41 which incorporates the discharge lamp lighting device as stated in any of the first to the seventh embodiments therein and a pair of sockets 42 for electrically connecting the discharge lamp lighting device to the fluorescent lamp LA, wherein a filament electrodes of the fluorescent lamp LA are detachably attached to the sockets 42.
  • the straight-tube fluorescent lamp is used as the load herein, the present invention may be applied to a lighting device for a circular fluorescent lamp, a compact fluorescent lamp or a double annular fluorescent lamp.
  • the illumination fixture capable of stably performing dimming lighting to the low luminous flux level can be realized.

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)

Claims (10)

  1. Beleuchtungseinrichtung für eine NiederdruckEntladungslampe aufweisend:
    eine Wechselrichterschaltung (4), die ein oder mehrere Schaltelemente (Q1, Q2) zum Schalten einer von einer Gleichspannungsquelle (Vdc) bereitgestellten Gleichspannung aufweist;
    eine Betriebsschaltung (8) zum Einschalten und Ausschalten der Schaltelemente (Q1, Q2) mit hoher Frequenz;
    ein Resonanzschaltkreis, an den eine durch die Schaltelemente (Q1, Q2) geschaltete Spannung angelegt wird, wobei der Resonanzschaltkreis eine Resonanzspannung (Vla) an eine Entladungslampe (LA) anlegt;
    ein Mittel (5, 10, 11, 13), das dazu eingerichtet ist, eine Regelung auszuführen, um die Lampenimpedanz der Entladungslampe (LA) im Wesentlichen konstant zu halten;
    dadurch gekennzeichnet, dass das Mittel (5, 10, 11, 13), das dazu eingerichtet sind, eine Regelung auszuführen, um die Lampenimpedanz der Entladungslampe (LA) im Wesentlichen konstant zu halten, aufweist:
    ein Lampenspannungserfassungsmittel (11), das dazu eingerichtet ist, die Spannung (Vla) der Entladungslampe (LA) zu erfassen;
    ein Lampenstromerfassungsmittel (13), das dazu eingerichtet ist, eine Spannung zu erfassen, die einem Effektivwert eines Stromes (Ila) der Entladungslampe (La) entspricht;
    ein Berechnungsmittel (10), das dazu eingerichtet ist, die Spannung (Vla) der Entladungslampe, die durch das Lampenspannungserfassungsmittel (11) erfasst wurde, durch den Strom (Ila) der Entladungslampe, der durch das Lampenstromerfassungsmittel (13) erfasst wurde, zu teilen, und eine Spannung bereitzustellen, die der Impedanz der Lampe entspricht;
    ein Steuermittel (5), das dazu eingerichtet ist, zwischen einer ersten Steuerfunktion, die die von der Gleichspannungsquelle bereitgestellte Gleichspannung (Vdc) oder die Einschaltdauer des einen oder der mehreren Schaltelemente (Q1, Q2) einstellt, so dass ein Ausgangssignal der Berechnungsmittel (10) mit einem einer Referenzspannung (Vdim) entsprechenden Sollwert übereinstimmt und einer zweiten Steuerfunktion, die die von der Gleichspannungsquelle bereitgestellte Gleichspannung (Vdc) oder die Einschaltdauer der Schaltelemente (Q1, Q2) einstellt, so dass das Ausgangssignal des Lampenspannungserfassungsmittels (13) im Wesentlichen mit der Referenzspannung übereinstimmt, umzuschalten, wobei die Referenzspannung durch einen Dimmer (9) eingestellt wird;
    wobei die Beleuchtungseinrichtung ferner aufweist:
    einen Schalter (SW3), der dazu eingerichtet ist, wahlweise zwischen dem Ausgangssignal des Stromerfassungsmittels (13) und dem Ausgangssignal des Berechnungsmittels (10) umzuschalten, um ein Eingangssignal für das Steuermittel (5) bereitzustellen; und
    eine Schaltung zum Umschalten des Schalters (SW3) entsprechend dem Ausgangssignal des Dimmers (9).
  2. Die Beleuchtungseinrichtung für die Niederdrucklampe nach Anspruch 1, wobei:
    die durch den Dimmer (9) eingestellte Referenzspannung kontinuierlich veränderbar ist oder ein während dem Dimmen vorgegebener Wert ist ein ganzzahliges Vielfaches eines während des Nennleistungs-Beleuchtungsbetriebs vorgegebenen Wertes.
  3. Beleuchtungseinrichtung für eine Niederdrucklampe nach einem der Ansprüche 1 oder 2, wobei:
    eine Verstärkung, G, des Steuermittels (5) entsprechend einem Dimmniveau variiert wird.
  4. Beleuchtungseinrichtung für eine Niederdrucklampe nach einem der Ansprüche 1 bis 3, wobei:
    das Steuermittel (5) vor dem Start der Entladungslampe (LA) deaktiviert und nach dem Start der Entladungslampe (LA) aktiviert wird.
  5. Beleuchtungseinrichtung für eine Niederdruckentladungslampe nach einem der Ansprüche 1 bis 4, wobei:
    die Niederdruckentladungslampe (LA) ferner eine Fehlererkennungsschaltung (51) enthält, die das Ausgangssignal der Wechselrichterschaltung unterdrückt oder stoppt, wenn das Ausgangssignal des Lampenspannungserfassungsmittels (11) oder des Lampenstromerfassungsmittels (13) größer ist als oder gleich groß ist wie ein vorgegebener Schwellenwert.
  6. Beleuchtungseinrichtung für eine Niederdruckentladungslampe nach einem der Ansprüche 1 bis 5, wobei:
    die Niederdruckentladungslampe ferner einen oberen Begrenzer (52) aufweist, um das Ausgangssignal der Berechnungsmittel (10) zu begrenzen, so dass es gleich groß ist wie oder kleiner als ein vorgegebener oberer Grenzwert.
  7. Beleuchtungseinrichtung für eine Niederdruckentladungslampe nach einem der Ansprüche 1 bis 5, wobei:
    die Niederdruckentladungslampe ferner einen unteren Begrenzer (53) aufweist, um das Ausgangssignal der Lampenstromerfassungsmittel (13) zu begrenzen, so dass es gleich groß ist wie oder kleiner als ein vorgegebener unterer Grenzwert.
  8. Beleuchtungseinrichtung für eine Niederdruckentladungslampe nach einem der Ansprüche 1 bis 7, wobei:
    das Berechnungsmittel (10) ein analoger IC zur Division und/oder ein Mikrocomputer und/oder ein digitaler Signalprozessor ist.
  9. Beleuchtungseinrichtung für eine Niederdruckentladungslampe nach einem der Ansprüche 1 bis 8, wobei:
    die Niederdruckentladungslampe (LA) ferner einen Sensor (17) aufweist; und
    das Dimmniveau entsprechend dem Ausgangssignal des Sensors verändert wird.
  10. Beleuchtungsanordnung aufweisend eine Beleuchtungseinrichtung für eine Niederdruckentladungslampe nach einem der Ansprüche 1 bis 9.
EP20100001589 2009-03-18 2010-02-17 Niederdruck-Beleuchtungsvorrichtung mit Hochdruckentladungslampe und Leuchte damit Not-in-force EP2230887B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009066547A JP2010218963A (ja) 2009-03-18 2009-03-18 低圧放電灯点灯装置及びそれを用いた照明器具

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EP2230887A1 EP2230887A1 (de) 2010-09-22
EP2230887B1 true EP2230887B1 (de) 2012-10-10

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010063867A1 (de) * 2010-12-22 2012-06-28 Tridonic Gmbh & Co Kg Zündregelung und Zünderkennung von Gasentladungslampen
JP5741004B2 (ja) * 2011-01-20 2015-07-01 株式会社村田製作所 スイッチング電源装置、及びｌｅｄ照明装置
DE102011082245B3 (de) * 2011-09-07 2013-01-17 Osram Ag Elektronisches Vorschaltgerät und Verfahren zum Betreiben einer Entladungslampe
DE102011082239B3 (de) * 2011-09-07 2013-01-17 Osram Ag Elektronisches Vorschaltgerät und Verfahren zum Betreiben einer Entladungslampe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4039498B4 (de) 1990-07-13 2006-06-29 Lutron Electronics Co., Inc. Schaltkreis und Verfahren zum Dimmen von Gasentladungslampen
US7116063B2 (en) * 2003-07-28 2006-10-03 Matsushita Electric Works, Ltd. Dimmable discharge lamp lighting device
JP4168975B2 (ja) 2004-05-26 2008-10-22 松下電工株式会社 放電灯点灯装置及び照明器具
JP4438513B2 (ja) 2004-05-26 2010-03-24 パナソニック電工株式会社 放電灯点灯装置及び照明器具
JP4561350B2 (ja) * 2004-12-20 2010-10-13 東芝ライテック株式会社 放電灯点灯装置及び照明器具並びに照明システム

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EP2230887A1 (de) 2010-09-22

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