EP2381746A2 - Dispositif d'éclairage d'une lampe de décharge et accessoire d'éclairage - Google Patents

Dispositif d'éclairage d'une lampe de décharge et accessoire d'éclairage Download PDF

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Publication number
EP2381746A2
EP2381746A2 EP11162647A EP11162647A EP2381746A2 EP 2381746 A2 EP2381746 A2 EP 2381746A2 EP 11162647 A EP11162647 A EP 11162647A EP 11162647 A EP11162647 A EP 11162647A EP 2381746 A2 EP2381746 A2 EP 2381746A2
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EP
European Patent Office
Prior art keywords
discharge lamp
discharge lamps
voltage
resonant
lighting device
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Withdrawn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
EP11162647A
Other languages
German (de)
English (en)
Other versions
EP2381746A3 (fr
Inventor
Masahiro Naruo
Shigeru Ido
Kei Mitsuyasu
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Electric Works Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Electric Works Co Ltd filed Critical Panasonic Electric Works Co Ltd
Publication of EP2381746A2 publication Critical patent/EP2381746A2/fr
Publication of EP2381746A3 publication Critical patent/EP2381746A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—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
    • H05B41/2827—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 using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
    • 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

Definitions

  • the present invention relates to a discharge lamp lighting device, and an illumination fixture using the same.
  • a discharge lamp lighting device that is provided with: a resonant part that constitutes a resonant circuit along with a discharge lamp; and a switching part that lies between a DC power source and the resonant part, includes at least one switching element, and according to on/off of the switching element, switches connection between the DC power source and the resonant part, converts DC power of the above DC power source to AC power on the basis of resonance occurring in the above resonant circuit due to operation of the switching part, and lights the discharge lamp with the AC power.
  • a discharge lamp lighting device configured such that the above discharge lamp lighting device is provided with: an electric quantity detection part that detects an electric quantity correlated to power outputted from the resonant part to the discharge lamp; and a control part that performs feedback control of a frequency of operation of a drive part so as to bringing the electric quantity detected by the electric quantity detection part close to a predetermined target value (e.g., see Patent literature 1).
  • Each of the discharge lamps La is a hot cathode type discharge lamp, and has filaments as a pair of electrodes.
  • the switching part 1 includes a series circuit of two switching elements Q1 and Q2 connected between output terminals of a DC power source E.
  • Each of the switching elements Q1 and Q2 includes, for example, an n-channel MOSFET. Also, a lower voltage side output terminal of the DC power source E is connected to the ground.
  • the resonant part 2 includes two sets of LC resonant circuits each provided for each of the discharge lamps La, and each of the LC resonant circuits includes: an inductor L11 or L12 having one terminal connected to a connecting point between the switching elements Q1 and Q2; a capacitor (hereinafter referred to as a "parallel capacitor”) C11 or C12 connected between the other terminal of the inductor L11 or L12 and the ground; and a capacitor (hereinafter referred to as a "series capacitor”) C21 or C22 having one terminal connected to the other terminal of the inductor L11 or L12 and the other terminal connected to one terminal (i.e., one of the filaments) of a corresponding one of the discharge lamp La.
  • the other terminal (a filament on a side not connected to the series capacitor C21 or C22) of each of the discharge lamps La is connected to the ground.
  • the switching part 1 and the resonant part 2 constitutes an inverter circuit of a so-called half bridge type, and by alternately on/off driving the switching elements Q1 and Q2 of the switching part 1 (i.e., by periodically driving the respective switching elements Q1 and Q2 so as to always turn off at least one of the switching elements Q1 and Q2, and alternately turn on the two switching elements Q1 and Q2), on the basis of action of a resonant circuit constituted by the resonant part 2 and each of the discharge lamps La, the DC power of the DC power source E is converted to high frequency AC power, which is then inputted to each of the discharge lamps La.
  • a drive part 3 that on/off drives the respective switching elements Q1 and Q2 of the switching part 1, and a control part 4 that controls the drive part 3 are respectively realized with well known electronic circuits, and therefore detailed illustration and description thereof are omitted.
  • the control part 4 has a feedback terminal FB inputted with an inter-terminal voltage (hereinafter referred to as a "detection voltage") of the current detecting resistor Rd, and performs feedback control of a frequency of operation of the drive part 3 (i.e., a frequency of a voltage outputted to each of the discharge lamps La, and hereinafter referred to as an "operating frequency") f so as to match an effective value of the input voltage to the feedback terminal FB with a predetermined reference voltage.
  • a detection voltage an inter-terminal voltage
  • the above detection voltage i.e., the inter-terminal voltage of the current detecting resistor Rd is proportional to a sum of currents flowing through the respective discharge lamps La (hereinafter referred to as a "resonant current") IL. That is, the above feedback control makes an effective value
  • Fig. 18 illustrates relationship between an effective value
  • a preheating operation is first performed, in which in a state where the operating frequency f is changed to a predetermined initial frequency fp high enough with respect to a resonant frequency fr of the resonant part 2 such that the effective value
  • the discharge lamp lighting device is provided with a preheating circuit (not illustrated) that applies a current to the respective filaments during the above heating operation.
  • the preheating circuit as described above can be realized by a well known technique, and therefore illustration and description thereof are omitted.
  • the control part 4 starts the above feedback control.
  • starting sweep operation operation that gradually brings the effective value
  • target current a predetermined target value
  • Is1 an operating points changes from A1 to A2, and the operating frequency f gradually decreases from the initial frequency fp to a predetermined starting frequency fs.
  • the above target current Is1 is set to a value that allows the effective value
  • lighting completion detecting means (not illustrated) adapted to detect the state where all of the discharge lamps La are lit (hereinafter referred to as a "lighting completion state"), and after the lighting completion detecting means has detected the lighting completion state, the control part 4 controls the drive part 3 to make an optical output of each of the discharge lamps La equal to an optical output according to an externally inputted lighting control signal. Further, if even after a predetermined time has passed since the completion of the preheating operation, the lighting completion state is not detected, the control part 4 may stop the operation of the drive part 3 to respectively keep the switching elements Q1 and Q2 of the switching part 1 in off states.
  • the lighting completion detecting means as described above can be realized by a well known technique, and therefore illustration and description thereof are omitted.
  • a characteristic becomes one as indicated by a curve c in Fig. 19 .
  • the operating points changes from a point C1 to a point C2 illustrated in Fig. 19 .
  • excessively high voltages are respectively outputted to the discharge lamps, for example, in the case of the unlighted discharge lamp La, the operating point changes to a point A3 illustrated in Fig. 18 , and in the case of the lighted discharge lamp La, the operating point changes to a point B2 illustrated in Fig. 18
  • the present invention is made for the above reason, and an object thereof is to provide a discharge lamp lighting device capable of reducing stress that is placed on respective discharge lamps at the start time, and an illumination fixture using the discharge lamp lighting device.
  • a discharge lamp lighting device of the present invention is a discharge lamp lighting device that lights a plurality of discharge lamps, and provided with: a resonant part that is connected to each of the discharge lamps and constitutes a resonant circuit along with each of the discharge lamps; a switching part that lies between a DC power source and the resonant part, includes at least one switching element, and according to on/off of the switching element, switches connection between the DC power source and the resonant part; a drive part that on/off drives the respective switching elements of the switching part to thereby supply AC power to the respective discharge lamps from the resonant part; an electric quantity detection part that detects one electric quantity correlated to an inter-terminal voltage of each of the discharge lamps; a control part that performs feedback control of a frequency of operation of the drive part so as to bring the electric quantity detected by the electric quantity detection part close to a predetermined target value; and a lighting detection part that detects start of a semi-lighting state where only a part of the plurality of discharge lamps is lit
  • the resonant part includes one LC resonant circuit; and a balancer having a plurality of windings each having one terminal connected to one terminal of a corresponding one of the discharge lamps and the other terminal connected to the resonant part is provided, the plurality of windings being mutually magnetically coupled.
  • the discharge lamp lighting device is provided with a capacitor having both terminals that are respectively connected to a connecting point between one of the windings of the balancer and a corresponding one of the discharge lamps and a connecting point between the other winding and the other discharge lamp.
  • the electric quantity detection part detects, as the electric quantity, currents flowing through the switching elements of the switching part.
  • the electric quantity detection part detects, as the electric quantity, an inter-terminal voltage of any component of the resonant part.
  • the lighting detection part compares an effective value of an input current from a side of the discharge lamps to the resonant part with a predetermined switching threshold value, and when the effective value of the input current exceeds the switching threshold value, detects the start of the semi-lighting state.
  • the balancer has a detecting winding; and when a detection voltage obtained by rectifying and smoothing an inter-terminal voltage of the detecting winding exceeds a predetermined lighting determination voltage, the lighting detection part detects the start of the semi-lighting state.
  • the balancer has a detecting winding; the lighting detection part generates a detection voltage by rectifying and smoothing an inter-terminal voltage of the detecting winding; and the control part decreases the target value as the detection voltage increases.
  • the discharge lamp lighting device is provided with an extinction detection part that detects start of an extinction state where all of the discharge lamps are extinguished, wherein after a predetermined delay time has passed since the extinction detection part detected the start of the extinction state, the control part decreases the frequency of the operation of the drive part to a frequency before the lighting detection part detects the start of the semi-lighting state.
  • an illumination fixture of the present invention is provided with: any of the above the discharge lamp lighting devices; and a fixture main body that holds the discharge lamp lighting device.
  • a target value is changed so as to decrease an inter-terminal voltage of each of discharge lamps, so that electric stress placed on each of the discharge lamps at the start time is reduced.
  • a basic configuration of the present embodiment is in common with the conventional example described with Fig. 17 , and therefore description of common parts is omitted.
  • the feedback terminal FB of the control part 4 is connected to the current detecting resistor Rd through a resistor R1, and also to the ground through a series circuit of another resistor R2 and a switching element (hereinafter referred to as a "control switching element") Q3 including an npn type transistor.
  • the present embodiment is provided with a lighting detection part 5 that: detects the start of the semi-lighting state; at least during a period before the semi-lighting state is detected at the start time, keeps the control switching element Q3 in an on state; and when the start of the semi-lighting state is detected, off controls the control switching element Q3. That is, at the start time, until the lighting detection part 5 detects the start of the semi-lighting state, the input voltage to the feedback terminal FB is kept in a lowered state caused by voltage division by the resistors Ra and R2, and when the lighting detection part 5 detects the start of the semi-lighting state, the control switch Q3 is turned off to thereby increase the input voltage to the feedback terminal FB. Note that even in the case where the above series circuit of the control switching element Q3 and the resistor R2 is connected in parallel to the current detecting resistor Rd, the same effect is obtained.
  • of the resonant current IL is a value obtained by multiplying a ratio of the effective value
  • the target value (target current) for the feedback control is decreased in control part 4, and thereby the effective value
  • of the resonant current IL that is achieved when the operating frequency f is changed to the operating frequency (starting frequency) fs that achieves a target current (hereinafter referred to as a "first target current") Is1 before the decrease in a characteristic curve a in the extinction state is defined as a second target current Is2, and if a target current that is the above-described decreased target value is matched with the second target current Is2, even after the start of the semi-lighting state, the operating frequency f is kept at the starting frequency fs as indicated by operating points C1 and B1 in Fig. 2 , and therefore the inter-terminal voltage of the unlighted discharge lamp La is also kept.
  • a terminal (hereinafter referred to as a "setting terminal") VR that receives a change in reference voltage to be compared with the input voltage to the feedback terminal FB may be provided in the control part 4, and the setting terminal VR may be connected with the lighting detection part 5.
  • the control part 4 makes the reference voltage lower than that during a period during which the input voltage to the setting terminal VR is less than the threshold voltage.
  • control part 4 can be realized by a well known technique, and therefore detailed illustration and description thereof are omitted. However, rather, the configuration where, as illustrated in Fig. 1 , the input voltage to the feedback terminal FB is changed has an advantage of easily using an existing integrated circuit as the control part 4.
  • the resonant part 2 may include only one LC resonant circuit, and each of the discharge lamps La may be connected to the resonant part 2 through a corresponding one of windings of a balancer T.
  • the balancer T is a so-called balancer transformer having a plurality of windings that are, for example, wound on a common iron core to be mutually magnetically connected. Also, in each of examples of Figs.
  • the resonant part 2 is provided with a series circuit that is connected between the connecting point between the switching elements Q1 and Q2 and the ground and includes an inductor L1 and a parallel capacitor C1. Also, in the example of Fig. 4 , the resonant part 2 is provided with a series capacitor C2 of which one terminal is connected to a connecting point between the inductor L1 and the parallel capacitor C1 and the other terminal is connected to one terminal of each of the windings of the balancer T as an output terminal of the resonant part 2, and the other terminal of each of the windings of the balancer T is connected to one of terminals (one of filaments) of a corresponding one of the discharge lamps La. In the example of Fig.
  • the series capacitor C2 is absent in the resonant part 2, but the connecting point between the inductor L1 and the parallel capacitor C1 serves as the output terminal of the resonant part 2, whereas the other terminal of each of the windings of the balancer T is connected to one of the terminals of a corresponding one of the discharge lamps La through a series capacitor C21 or C22. Further, in each of the examples of Figs. 4 and 5 , the respective windings of the balancer T connect the one terminal (the other terminal in the above) on the discharge lamp La side to each other through a capacitor C3.
  • a curve a1 represents the lamp voltage VL in each of the discharge lamps La in the extinction state
  • a curve b1 represents the lamp voltage VL in each of the discharge lamps La in the lighting completion state
  • a curve a2 represents the lamp voltage VL in the unlighted discharge lamp La in the semi-lighting state
  • a curve b2 represents the lamp voltage VL in the lighted discharge lamp La in the semi-lighting state.
  • the operating frequency f is changed to an operating frequency fs1 (operating points A3, C2) slightly higher than the starting frequency fs and thereby in each of the discharge lamps La, the lamp voltage VL is excessively increased; however, by decreasing the target current to the appropriate second target current Is2, the operating frequency f can be changed to a sufficiently high frequency fs2 to thereby decrease the lamp voltage VL in each of the discharge lamps La (operating points A4, B3, C2).
  • the operating point immediately after the start of the lighting completion state where both of the discharge lamps La are lit is on3 indicated by B4 in Fig. 6 or 7 .
  • the electric quantity used by the control part 4 for the feedback control is not limited to the resonant current IL, but may be an electric quantity correlated to the inter-terminal voltage of each of the discharge lamps La.
  • the inductor L1 of the resonant part 2 may be provided with a secondary winding to input an inter-terminal voltage of the secondary winding (i.e., a voltage proportional to an inter-terminal voltage of the inductor L1), or as illustrated in Fig.
  • an inter-terminal voltage of the parallel capacitor C1 (i.e., an output voltage of the resonant part 2) may be inputted.
  • the electric quantity used by the control part 4 for the feedback control in the example of Fig. 8 , the inter-terminal voltage of the inductor L1 as a component of the resonant part 2 is used, whereas in the example of Fig. 9 , the inter-terminal voltage of the parallel capacitor C1 as a component of the resonant part 2 is used.
  • the inter-terminal voltage of the above secondary winding is, as with the inter-terminal voltage of the current detecting resistor Rd in the example of Fig.
  • the inter-terminal voltage of the parallel capacitor C1 is, as with the inter-terminal voltage of the current detecting resistor Rd in the example of Fig. 1 , inputted to the feedback terminal FB through the resistor R1, and also a resistor R3 connected in parallel to the series circuit of the resistor R2 and the control switching element Q3 is added.
  • the control switching element Q3 when the control switching element Q3 is turned off, a ratio of the input voltage to the feedback terminal FB to the above electric quantity is increased to thereby substantially decrease the target value for the feedback control.
  • Figs. 10 and 11 respectively illustrate specific examples of the lighting detection part 5.
  • the lighting detection part 5 is provided with: a resistor R4 that lies between the base of the control switching element Q3 and a constant voltage Vcc; and an npn type transistor (hereinafter referred to as an "output transistor") Q4 that lies between the base of the control switching element Q3 and the ground.
  • the balancer T is provided with a detecting winding; the lighting detection part 5 has a circuit that generates a detection voltage Va by rectifying and smoothing an inter-terminal voltage of the detection winding; and the detection voltage Va is decreased by an amount equal to a zener voltage VZD of a zener diode Zd, and then inputted to a base of the output transistor Q4.
  • the control switching element Q3 when the output transistor Q4 is in an off state, the control switching element Q3 is kept in the on state; however, in the semi-lighting state, the detection voltage Va sufficiently increases to thereby turn on the output transistor Q4, and on the basis this, the control switching element Q3 is turned off to decrease the target value. That is, the turning on of the output transistor Q4 means that the semi-lighting state is detected.
  • the lighting detection part 5 generates a detection voltage Va1 not by the detecting winding as in the example of Fig. 10 , but by diode-based semi-wave rectification, resistor Ri-based current/voltage conversion, and capacitor based smoothing of a current (i.e., the resonant current) IL flowing into the resonant part 2 from the discharge lamp La side, and directly inputs the detection voltage Va1 to the base of the output transistor Q4, and the rest is in common with the example of Fig. 10 . That is, in the semi-lighting state, the above detection voltage Va1 sufficiently increases to thereby turn on the output transistor Q4, and the turning on of the output transistor Q4 means the semi-lighting state is detected.
  • a current i.e., the resonant current
  • a circuit configuration as illustrated in Fig. 12 is employed.
  • a basic configuration is in common with the example of Fig. 10 ; however, there are differences from the example of Fig. 10 in that, as the control switching element Q3, in place of the transistor, an n-channel MOSFET is used, and the output transistor Q4 is connected in parallel with a capacitor (hereinafter referred to as a "delaying capacitor") C4. That is, in the case where the delaying capacitor C4 is not provided, as illustrated in Fig.
  • FIG. 13 and 14 illustrates time variations of an inter-terminal voltage (lamp voltage) VL1 of one of the discharge lamps La, which is lit, the current (lamp current) IL1 flowing through the one discharge lamp La, the inter-terminal voltage (lamp voltage) VL2 of the other (i.e., unlighted) discharge lamp La, the detection voltage Va, the gate-source voltage Vgs of the control switching element Q3, and the operating frequency f.
  • the above other discharge lamp La is not lit, and therefore in the above other discharge lamp La, the lamp current IL2 remains at 0.
  • the lamp voltages VL1 and VL2 in each of Figs. 13 and 14 are ones in which the lamp voltage VL illustrated in Fig.
  • the resonant current IL corresponds to a sum of the above lamp currents IL1 and IL2, i.e., IL1+IL2.
  • the starting sweep operation is performed; timing t3 indicates timing when the semi-lighting state is started by lighting of one of the discharge lamps La; timing t3 indicates timing when the above one discharge lamp La is first lit; timing t4 indicates timing when the target value is first decreased; and timing t5 indicate timing when in the respective discharge lamps La, amplitudes of the respective lamp voltages VL1 and VL2 are stabilized.
  • the target value is repeatedly decreased and restored to thereby make the lighting of the discharge lamp La unstable, whereas in the example of Fig. 14 , the target value is not restored and thereby the timing t5 when the amplitudes of the lamp voltages VL1 and VL2 are stabilized is earlier.
  • a part from the circuit that generates the detection voltage Va to the output transistor Q4 serves as an extinction detection part, and the turning off of the output transistor Q4 means that, in other word, the transition to the extinction state is detected. Note that even by inserting an appropriate delay circuit into a stage prior to a gate terminal of the control switching element Q3, the same operation can be achieved.
  • Such a delay circuit can be realized by a well known technique using, for example, a single stable multivibrator. Also, the above various types of variations can also be made to the example of Fig. 11 , and even in this case, a part from the circuit that generates the detection voltage Va to the output transistor Q4 serves as the extinction detection part as well.
  • the target value may be adapted to be continuously decreased as the detection voltage Va increases.
  • the lighting detection part 5 is configured to include only a circuit that generates the detection voltage Va, and an adder Add that adds a voltage generated by detecting the electric quantity (in the example of Fig. 15 , the inter-terminal voltage of the current detecting resistor Rd) and the detection voltage Va generated in the lighting detection part 5 to input a resultant voltage to the feedback terminal FB of the control part 4 is provided.
  • Add adds a voltage generated by detecting the electric quantity (in the example of Fig. 15 , the inter-terminal voltage of the current detecting resistor Rd) and the detection voltage Va generated in the lighting detection part 5 to input a resultant voltage to the feedback terminal FB of the control part 4 is provided.
  • the detection voltage Va other than zero means that the semi-lighting state is detected. Also, as the detection voltage Va increases, the input voltage to the feedback terminal FB is increased with respect to a constant electric quantity (e.g., the resonant current IL), and therefore the above target value (e.g., the target current) of the electric quantity is substantially decreased.
  • a constant electric quantity e.g., the resonant current IL
  • the above target value e.g., the target current
  • the target value in the extinction state is sufficiently increased to the extent that, out of the discharge lamps La envisaged to be connected, one having the highest rated power can be lit, the lower the impedance of each of the discharge lamps La, the more the target value is decreased, and thereby electric stress on each of the discharge lamps La is reduced.
  • a circuit configuration is not limited to any of the above ones, but for example, a single transistor type inverter circuit in which a switching part 1 includes one switching element may be used.
  • an inverter circuit of a so-called full bridge type that has: a switching part 1 in which two series circuits each including two switching elements are connected in parallel; and a resonant part 2 connected between connecting points between the switching elements of one of the series circuits and between the switching elements of the other series circuit.
  • the control part 4 and lighting detection part 5 may also be configured such that the control part 4 is directly inputted with an output of the lighting detection part 5 to switch the target value according to the output. Variations as described above can be realized by a well know technique, and therefore detailed illustration and description thereof are omitted.
  • the lighting detection part 5 generates an output depending on the number of lighted discharge lamps La
  • the control part 4 changes the target value in a stepwise manner depending on the number of the lighted discharge lamps La.
  • the lighting detection part 5 and the control part 4 as described above can be respectively realized by a well known technique, and therefore detailed illustration and description thereof are omitted.
  • the illumination fixture 6 in Fig. 16 is provided with: a rectangular parallelepiped shaped fixture main body 61 that contains and holds the respective circuit components constituting the discharge lamp lighting device, such as the switching part 1 and resonant part 2; and four sockets 62 each of which is electrically connected to a corresponding one of the output terminals of the resonant part 2 directly or through a corresponding one of the windings of the balancer T, held on one surface side of the fixture main body 61, and electrically and mechanically connected to a corresponding one of terminals of a corresponding one of the discharge lamps La of a straight tube type.
  • the surface that holds the respective sockets 62 i.e., a surface on a side where the respective discharge lamps La are arranged, and a lower surface in Fig. 15
  • the illumination fixture 6 as described above can be realized by a well known technique, and therefore detailed description thereof is omitted.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
EP11162647.9A 2010-04-23 2011-04-15 Dispositif d'éclairage d'une lampe de décharge et accessoire d'éclairage Withdrawn EP2381746A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010100261A JP2011233266A (ja) 2010-04-23 2010-04-23 放電灯点灯装置及びそれを用いた照明器具

Publications (2)

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EP2381746A2 true EP2381746A2 (fr) 2011-10-26
EP2381746A3 EP2381746A3 (fr) 2016-09-28

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EP11162647.9A Withdrawn EP2381746A3 (fr) 2010-04-23 2011-04-15 Dispositif d'éclairage d'une lampe de décharge et accessoire d'éclairage

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008218333A (ja) 2007-03-07 2008-09-18 Matsushita Electric Works Ltd 放電灯点灯装置及び照明器具

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3197166B2 (ja) * 1994-09-02 2001-08-13 株式会社小糸製作所 放電灯の点灯回路
JP2000012269A (ja) * 1998-06-25 2000-01-14 Matsushita Electric Works Ltd 放電灯点灯装置
JP2006049028A (ja) * 2004-08-03 2006-02-16 Minebea Co Ltd 放電灯点灯装置
JP2010067562A (ja) * 2008-09-12 2010-03-25 Panasonic Electric Works Co Ltd 点灯装置、照明装置、液晶表示装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008218333A (ja) 2007-03-07 2008-09-18 Matsushita Electric Works Ltd 放電灯点灯装置及び照明器具

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JP2011233266A (ja) 2011-11-17
EP2381746A3 (fr) 2016-09-28

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