JP2009283184A - Lighting device, and discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of surely stopping a circuit function as tracking occurs, and to provide a discharge lamp. <P>SOLUTION: A compact self-ballasted fluorescent lamp houses a lighting device 50 to light an luminous tube 10 in the inside of a case. This lighting device 50 is equipped with a rectifying and smoothing circuit 100, a filter circuit 110, an inverter circuit 120 having transistors Q1, Q2, a resonance circuit 130, a preheating circuit 140 having a positive temperature characteristic resistive element, and the like, and this circuit is composed of a plurality of electronic components mounted to an insulating substrate. The filter circuit 110 having a filter coil NF and coupling capacitors C5, C8 of the inverter circuit 210 is connected between the rectifying and smoothing circuit 100 and the inverter circuit 120, and a current fuse P is connected to the filter coil NF in series. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting device for a discharge lamp and a discharge lamp incorporating the lighting device.

With recent energy savings, low-pressure mercury discharge lamps with high lamp efficiency and long life, such as bulb-type fluorescent lamps, have been used in the field of lighting in place of incandescent bulbs that have been used in the past. ing.
This bulb-type fluorescent lamp (hereinafter simply referred to as “lamp”) includes an arc tube, a lighting device for lighting the arc tube, a resin case for holding the arc tube and housing the lighting device inside, etc. It is composed of One end of the case is provided with a base for attaching the lamp to the socket on the lighting fixture side and taking in electric power from a commercial power source.

  The lighting device is of a so-called inverter type, for example, a rectifying / smoothing circuit having a diode bridge element or a smoothing capacitor, an inverter circuit having a pair of switching elements, a resonance circuit having a choke coil and a resonance capacitor, etc. It is composed of Electronic components constituting each circuit are mounted on an insulating substrate made of, for example, glass fiber and epoxy resin.

In the above circuit, for some reason, the temperature of a part of the electrodes of the arc tube and the electronic components (among them, the component that generates heat when the lamp is lit, is simply called “heating component”) is excessively increased. In some cases, the case may be deformed, discolored, or melted.
In order to prevent such a problem, there is one configured to stop the circuit function when an electronic component starts to generate abnormal heat. For example, in the lighting device described in Patent Document 1, a current fuse is provided in the circuit, and a predetermined current flows through the current fuse and is electrically disconnected to stop the function of the lighting device.
Japanese Patent No. 3571098

However, in the lighting device described above, measures are taken when the temperature of the heat generating component rises excessively, but no measures are taken against problems occurring in the mounting portion of the insulating substrate on which the heat generating components are mounted. .
In other words, when the accumulated lighting time of the lamp becomes long (for example, the lamp life is approaching), the insulation performance of the mounting part of the heat generating component on the insulating substrate deteriorates, and leakage occurs in the part where the insulating property is reduced. Current flows (such a decrease in insulation and leakage current flows is called “tracking”, and the leakage current is also called “tracking current”), and the portion may eventually carbonize. The above measures cannot deal with such problems. Note that even if the heat-generating component generates heat due to an unexpected failure or the like, the insulating property is lowered at the portion of the insulating substrate where the heat-generating component is implemented, and the same problem as described above occurs.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting device and a discharge lamp that can reliably stop a circuit function when tracking occurs.

  In order to achieve the above object, in the lighting device according to the present invention, an electronic component constituting an inverter circuit that generates high-frequency power by switching a DC output from a DC power supply unit and applies it to a discharge lamp is mounted on an insulating substrate. The discharge lamp lighting device is characterized in that an inductor and a current fuse are provided in two connection paths connecting the DC power supply unit and the inverter circuit.

"Inductor and current fuse are provided on two connection paths" here means that when an inductor and current fuse are connected to one connection path, the inductor is connected to one connection path. The case where a current fuse is connected to the other connection path is included.
The “insulating substrate” is, for example, a substrate made of glass fiber and an epoxy resin, a substrate made of paper material and a phenol resin, and the like.

  In addition, the “discharge lamp” is a lighting device and a discharge lamp that are separated (can be used separately and separately) (that is, a lighting device that is not incorporated), or the discharge lamp is turned on. It is a concept that includes a built-in lighting device.

  Since the lighting device according to the present invention includes an inductor in a connection path connecting the DC power supply unit and the inverter circuit, high-frequency components generated in the inverter circuit are prevented from entering the upstream side (DC power supply unit side) from the circuit. This can prevent the fluctuation of the current value flowing through the current fuse. For this reason, the rated value at which the current fuse is disconnected can be kept low, and tracking increases the current flowing in the current fuse, causing the current fuse to be electrically disconnected at an early stage and stopping the power supply to the inverter circuit. it can.

  The inductor may form an LC filter with a capacitor connected to the input side of the inverter circuit, or the inverter circuit may be connected in series with a pair of switching elements connected in series. A pair of coupling capacitors connected to each other in parallel, wherein the discharge lamp is connected between a connection point of the pair of switching elements and a connection point of the pair of capacitors, and the inductor Is characterized in that an LC filter is constituted by the pair of capacitors. For this reason, size reduction of apparatus itself can be achieved.

Furthermore, the DC power supply unit is a rectifier circuit that rectifies power supplied from an AC power supply, or the current fuse is a protective element that is disconnected at a current of 0.5 to 1.2 A. It is characterized by that.
In a discharge lamp that is lit by a lighting device incorporated therein, the lighting device is a lighting device having the above-described configuration. For this reason, as described above, the rated value at which the current fuse is disconnected can be lowered, and by tracking, an increase in the current flowing through the current fuse causes the current fuse to be electrically disconnected at an early stage, thereby supplying power to the inverter circuit. Can be stopped.

<First Embodiment>
1. FIG. 1 is a cross-sectional view of a lamp 1 according to an embodiment as viewed from the side, and a part thereof is cut away so that the inside can be seen. The lamp 1 shown in this figure is a 12 W type that is an alternative to a 60 W type incandescent bulb, and is equipped with a lighting device inside.

As shown in FIG. 1, the lamp 1 includes an arc tube 10 having a discharge path formed in a double spiral shape, a holder 20 for holding the arc tube 10, and lighting for driving the arc tube 10 to light. The apparatus 50 includes a base 40 attached to one end, and a case 30 provided to cover the holder 20 and the lighting device 50.
The arc tube 10 is a swirl that passes through a portion where a single glass tube (for example, outer diameter: 9.0 (mm)) is folded back at a substantially central portion and the portion from the folded portion to the end portion is folded. The one formed by turning around an axis is used.

  Electrodes (not shown) each having a filament electrode are provided at both ends of the arc tube 10 (discharge path), that is, at the end of the glass tube. At this time, the distance (discharge path length) between the electrodes in the discharge path is set to 400 (mm), for example. A phosphor layer is formed on the inner surface of the arc tube 10, and a mixed gas such as mercury and Ar / Ne is sealed in the discharge path.

The holder 20 is made of a resin material such as PET (polyethylene terephthalate), and has an insertion hole (not shown) that matches the shape of the region in the vicinity of the electrode formation portion of the arc tube 10. The arc tube 10 is fixed in the holder 20 with a resin material 21 made of a material such as a silicone resin, with an electrode forming portion inserted into an insertion hole in the holder 20.
The case 30 is made of, for example, PBT (polybutylene terephthalate), and includes a small diameter portion 30a, a large diameter portion 30b having a diameter larger than the small diameter portion 30a, and a small diameter portion 30a between the small diameter portion 30a and the large diameter portion 30b. And a tapered portion 30c that expands from the large diameter portion 30b to a large diameter portion 30b, and has a funnel shape.

  The holder 20 is attached to the inner peripheral surface of the large diameter portion 30b of the case 30, and the base 40 is attached to the outer peripheral surface of the small diameter portion 30a. Here, the outer periphery of the holder 20 is attached to the large-diameter portion 30b of the case 30, but for example, the case and the holder may be integrated. That is, the case may be any case as long as it holds the arc tube, the base is attached to the small diameter portion, and the lighting device is accommodated therein.

The base 40 has, for example, a peripheral wall of a metal cylinder formed in a screw shape. Here, the E17 type is used. The base 40 is not limited to the E17 type, and may be, for example, an E26 type or a B shape.
The lighting device 50 is configured by mounting a plurality of electronic components on an insulating substrate 51 in which a predetermined pattern is wired on the main surface. As shown in FIG. 1, the lighting device 50 is incorporated into the case 30 with the periphery of the insulating substrate 51 locked by the locking portions 31 and 32 of the holder 20.
2. FIG. 2 illustrates a circuit configuration of the lamp 1 including the lighting device 50.

The lighting device 50 mainly includes a rectifying / smoothing circuit 100, a filter circuit 110, an inverter circuit 120, a resonance circuit 130, and a preheating circuit 140, and a current fuse P is provided between the rectifying / smoothing circuit 100 and the filter circuit 110. ing.
The rectifying / smoothing circuit 100 rectifies and smoothes commercial low-frequency alternating current, converts it into direct current, and outputs the direct current (corresponding to the “DC power supply unit” of the present invention). It comprises a diode bridge 103 composed of D2, D3 and D4 and electrolytic capacitors CD1 and CD2. Here, since the voltage doubler method is adopted, the output voltage of the rectifying and smoothing circuit 100 is about 2.8 times the input voltage (effective value). For example, if the voltage (effective value) of the commercial power supply is 100 (V), the output voltage of the rectifying and smoothing circuit 100 is about 280 (V).

The lighting device 50 is connected to a commercial power supply via a base 40, and an inrush current prevention resistor R <b> 1 is connected between the base 40 and the rectifying / smoothing circuit 100, that is, on the input side of the rectifying / smoothing circuit 100.
The inverter circuit 120 is a so-called half-bridge type constituted by a pair of switching elements (for example, transistors) Q1 and Q2 and two coupling capacitors C5 and C8.

That is, the inverter circuit 120 includes a pair of transistors Q1 and Q2 connected in series and a pair of coupling capacitors C5 and C8 connected in series, and a connection point n2 between the pair of transistors Q1 and Q2 and The arc tube 10 and the like are connected between the connection point n1 of the pair of coupling capacitors C5 and C8.
As the coupling capacitors C5 and C8, for example, those having a capacitance of 47 (nF) and a rated voltage of 250 (V) are used.

In the inverter circuit 120, the transistors Q1 and Q2 are alternately turned on and off (hereinafter also referred to as “switching”), whereby a load (resonance circuit 130) connected between the connection node n1 and the connection node n2. Then, a high frequency voltage (for example, 50 kHz) is supplied to the preheating circuit 140 and the arc tube 10).
The switching operations of the transistors Q1 and Q2 are performed by the current transformer CT. The current transformer CT has one primary coil and two secondary coils. The secondary coil induces a voltage corresponding to the magnitude and direction of the load current flowing in the primary coil, and is connected to the bases of the transistors Q1 and Q2.

  According to this configuration, a voltage is induced in the secondary coil by the load current that flows when the transistor Q1 is on, and the transistor Q1 is turned off and the transistor Q2 is turned on. On the other hand, a voltage is induced in the secondary coil by the load current that flows when the transistor Q2 is on, turning off the transistor Q2 and turning on the transistor Q1. For example, transistors having a rated current of 1 (A) and a rated voltage of 400 (V) are used as the transistors Q1 and Q2.

The start of the switching operation is performed by a starting circuit constituted by resistors R4A, R4B, R2A, R2B, a starting capacitor C3, and a trigger diode TD.
In this starting circuit, resistors R4A, R4B, R2A, R2B and a starting capacitor C3 are connected in series, and a connection node n3 between the resistor R2B and the starting capacitor C3 is connected to the base of the transistor Q2 via a trigger diode TD. Has been. For example, a capacitor having a rated capacitance of 33 (nF) and a rated voltage of 50 (V) is used as the starting capacitor C3.

  When the switching operation is started, the transistors Q1 and Q2 are alternately turned on and off by the output voltage of the current transformer CT. This switching turn-off requires a predetermined time peculiar to the switching element, and the current flowing immediately before it also flows to the choke coil L (inductance), and the switching time of voltage and current is slightly shifted. As a result, the loss in the transistors Q1 and Q2 increases significantly, and a snubber capacitor C4 is provided via the resistor R6 in order to suppress such switching loss and protect the transistors Q1 and Q2.

For example, a snubber capacitor C4 having a capacitance of 1 (nF) and a rated voltage of 1.2 (kV) is used, and a resistor R6 connected to the snubber capacitor C4 has a rated resistance value of 33 (Ω), for example. Is being used.
Further, commutation diodes D5 and D6 for flowing current from the emitter to the collector generated during the switching operation of the transistors Q1 and Q2 are connected to the transistors Q1 and Q2 in parallel with the transistors Q1 and Q2. .

Note that the commutation diode D5 is connected in series to the start-up capacitor C3 constituting the start-up circuit, and the current from the emitter to the collector of the transistor Q2 is transferred from the start-up capacitor C3 to the commutation diode D5. Flowing.
For example, a commutation diode D6 having a rated current of 1 (A) and a rated voltage of 600 (V) is used, and a commutation diode D5 includes, for example, a rated current of 1 (A) and a rated voltage of 600 ( For example, a capacitor having a rated capacitance of 33 (nF) and a rated voltage of 50 (V) is used as the starting capacitor C3.

The filter circuit (corresponding to the “LC filter” of the present invention) 110 is, for example, for EMC (electro-magnetic compatibility), and is shared by the filter coil NF and the electronic components constituting the inverter circuit 120 described above. This is a so-called LC filter composed of the coupling capacitors C5 and C8 used in this manner.
The filter circuit 110 has a function of removing switching noise from the transistors Q1 and Q2 and preventing the switching noise from flowing out to the commercial power source. For example, the filter coil NF having a rated inductance of 820 (μH) is used.

  The current fuse P is connected in series between the filter coil (corresponding to the “inductor” of the present invention) NF constituting the filter circuit 110 and the rectifying / smoothing circuit 100. In other words, the current fuse P and the filter coil NF are inserted in the connection path X that connects the rectifying and smoothing circuit 100 and the inverter circuit 120, and the coupling capacitors C5 and C8 are connected across the connection paths X and Y. ing. As the current fuse P, for example, one having a rated current of 0.5 (A) is used.

The resonance circuit 130 is configured by connecting a choke coil L and a resonance capacitor C6 in series. The resonance circuit 130 has a function of flowing a preheating current to the filament electrodes and increasing the voltage between the filament electrodes.
The preheating circuit 140 includes a resonance capacitor C6 and a positive temperature characteristic resistance element PTC. The preheating circuit 140 is connected in parallel between the filament electrodes, and adjusts the preheating current to the filament electrodes to an optimum value.

In addition, resistances (for example, R5 to R9, etc.) for current adjustment or the like are appropriately inserted in each circuit or a place where each circuit is connected.
3. Description of Operation A normal lighting operation of the lamp 1 will be briefly described with reference to FIG.
The AC power supplied from the commercial power source to the lighting device 50 via the base 40 is once converted into DC power in the rectifying and smoothing circuit 100 and output to the inverter circuit 120. As a result, the voltage across the terminals of the starting capacitor C3 rises with a constant time constant. The time constant is determined by the resistance values of the resistors R2A, R2B, R4A, R4B, and R3 and the capacitance of the starting capacitor C3.

When the voltage between the terminals of the starting capacitor C3 exceeds the breakover voltage of the trigger diode TD, the voltage between the terminals of the starting capacitor C3 is applied to the base of the transistor Q2, and the transistor Q2 is turned on. As a result, the switching operation is started.
Thereafter, a high frequency voltage is supplied to the resonance circuit 130, the preheating circuit 140, and the arc tube 10, a current flows through the positive temperature characteristic resistance element PTC, and the resonance frequency of the resonance circuit 130 increases as the temperature of the positive temperature characteristic resistance element PTC increases. And a high voltage is applied between the electrodes. As a result, dielectric breakdown occurs between the electrodes in the arc tube 10, current flows between the two electrodes, and the lamp 1 is turned on.

Next, the operation of the lamp 1 having the above-described configuration when the arc tube 10 is at the end of its life, the insulating property of the insulating substrate 51 is lowered, and a leakage current flows through the heat generating component mounting portion of the insulating substrate 51 will be described.
For example, when a leak current flows through the insulating substrate 51 between a and b in FIG. 2, the power output from the rectifying and smoothing circuit 100 increases, and the input power input to the inverter circuit 120 increases. At that time, since the input power is supplied to the inverter circuit 120 via the current fuse P and the filter circuit 110, a higher current flows through the current fuse P than that during normal lighting.

Then, as the leakage current flowing through the insulating substrate 51 increases, the insulating property of the insulating substrate 51 is further lowered. As a result, the leakage current of the insulating substrate 51 increases and the amount of current flowing through the current fuse P also increases.
When the current amount of the current fuse P exceeds a predetermined value, the current fuse P is electrically disconnected (melted), and power supply to the inverter circuit 120 is stopped.

This stops the function of the device itself, prevents leakage current from flowing through the insulating substrate 51, and prevents the insulating substrate 51 from deteriorating and carbonizing the mounting portion of the insulating substrate 51. be able to.
Further, the current fuse P has a larger current value when the lamp 1 is started and when the lamp 1 is steadily lit, but the filter circuit 110 is interposed between the DC power supply circuit 100 and the inverter circuit 120. Since the superposition of high frequency current due to switching is cut and the filter circuit 110 is not provided, the value of the current flowing through the current fuse P can be reduced.

For this reason, the rated value of the current fuse P can be set low, and even if the current due to tracking of the insulating substrate 51 is a small value of about 0.5 (A) to 1.2 (A), Current fluctuation is detected immediately, and the current fuse P is disconnected, so that the safety of the lamp 1 can be improved.
Thus, since the current fuse P is connected in series to the filter circuit 110 arranged on the upstream side (rectifying and smoothing circuit 100) side of the inverter circuit 120, the value of the current flowing through the current fuse P can be reduced. A current fuse rated value (current value at the time of disconnection) that is close to the current value that flows through the current fuse when the lamp is lit in a state where no abnormality such as tracking occurs can be used.
<Modification>
Although the present invention has been described based on the embodiments, the content of the present invention is not limited to the specific examples shown in the above embodiments. For example, the following modifications are possible. Can be implemented.

1. About the Lamp (1) Whole Lamp In the above embodiment, the 12 W type bulb-type fluorescent lamp 1 has been described as an example. However, the type and size of the lamp are not limited thereto.
In the above embodiment, an electrode type lamp in which an electrode having a filament is sealed at the end of a glass tube constituting the arc tube has been described. The present invention can also be applied to an electrode type lamp.

Moreover, it is applicable also to the lighting device which has an inverter circuit for general lighting fixtures. In this case, for example, the “light emitting tube” described in the embodiment with the cap attached thereto corresponds to a discharge lamp, and the discharge lamp is attached to a socket of a lighting fixture.
(2) Shape of arc tube In the embodiment, the arc tube has a double spiral shape, but other shapes may naturally be used. Examples of other shapes include, for example, a U-shape obtained by bending one glass tube, and a so-called “kura-shaped” shape obtained by further bending the U-shaped glass tube. A plurality of glass tubes curved in a letter shape, for example, two or three, may be combined.
(3) Presence / absence of globes Further, in the embodiment, a so-called D-type light bulb-type fluorescent lamp without a globe covering the arc tube has been described. For example, A-type, T-type, G-type, R-type (reflective type) A bulb-type fluorescent lamp having a glove shape) may be used.
2. Lighting Device (1) DC Power Supply Unit In the embodiment, the DC power supply unit is a rectifying / smoothing circuit that rectifies and smoothes the AC power supply and outputs the DC power supply. For example, the direct current power supply unit is directly provided inside. There may be.
(2) Inverter circuit Although the lighting device 50 in the first embodiment uses a half-bridge type for the inverter circuit 120, other types may be used.

FIG. 3 is a diagram illustrating a lighting device according to the first modification.
The lighting device 200 according to the first modification includes a rectifying / smoothing circuit 210, a filter circuit 220, an inverter circuit 230, a resonance circuit 130, and a preheating circuit 140. A current fuse 2P is interposed between the rectifying / smoothing circuit 210 and the filter circuit 220. It has.
The rectifying and smoothing circuit 210 uses one electrolytic capacitor 2CD1, and the inverter circuit 230 is a so-called series inverter system, and includes a pair of transistors 2Q1 and 2Q2, a coupling capacitor 2C5, and the like.

In the inverter circuit 230, the transistor 2Q2 is turned on by the starting circuit (resistors R2, 4 and capacitor C3, etc.), and the transistors Q1, Q2 are alternately turned on / off by the current transformer 2CT, as in the embodiment. repeat.
The filter circuit 220 includes a filter coil 2NF and a noise prevention capacitor 2C1 connected to the input side of the inverter circuit 230. In other words, the anti-noise capacitor 2C1 is connected across the connection paths X and Y connecting the rectifying / smoothing circuit 210 and the inverter circuit 230, and the filter coil 2NF forms an LC filter for EMC. A current fuse 2P is connected in series to the filter coil 2NF.

Also in the lighting device having the above configuration, when the insulating property of the insulating substrate is lowered and a tracking current flows and the current amount of the current fuse P exceeds a predetermined value, the current fuse P is electrically disconnected as in the embodiment. In addition, power supply to the inverter circuit 230 can be stopped.
In this modification, a series inverter type circuit is used, but another inverter circuit may be used. Other types of inverter circuits include, for example, a one-stone inverter, an L-push-pull inverter, an inverter with a harmonic countermeasure function, a full bridge inverter, and a chopper.
(3) Others In the embodiment and the first modification, the transistor is used as the switching element, but other elements can also be used. Another element is an FET element. In this case, it is not necessary to provide the commutation diodes D5 and D6 in the embodiment.
3. Regarding the positional relationship between the current fuse and the filter In the embodiment, the current fuse is connected in series in a state adjacent to the inductor of the filter circuit on the high voltage side (connection path X) of the DC power supply unit. Even if the fuse is separated from the inductor (not adjacent), it is sufficient if it is connected in series to the inductor. For example, the current fuse is connected to the high-voltage side (connection path X) of the DC power supply unit. The inductor may be connected to the low voltage side (connection path Y) of the DC power supply unit.
4). Current Fuse, Inductor In the embodiment, a protective element having a rated current of 0.5 (A) is used as a current fuse, but a current fuse of other specifications may be used. However, it is necessary to disconnect by the tracking current. Considering the fact that the tracking current is 1 (A) or more is the reason why a defect occurs in the insulating substrate, it is preferable that the current fuse breaks at about 1 (A).

Further, since a current flows through the current fuse even during normal lighting, it is necessary to prevent disconnection due to the current during normal lighting (about 200 (mA) in the case of 25 W full-wave rectification).
Therefore, from the above, it is preferable that the current fuse has a rated current in the range of 0.2 (A) to 1.2 (A).
Further, for example, an inductor (filter coil NF) having a rated inductance of 820 (μH) is used, but an inductor having other specifications may be used. However, the inductor value is 470 (in the relationship of the lighting frequency (generally 40 (kHz) to 80 (kHz) from the relationship between the lamp efficiency and the switching of the inverter circuit, the relationship of a general remote controller, etc.)). If it is not higher than [mu] H), the high-frequency current increases, and considering the overall size and shape of the inductor, 1500 [[mu] H) or lower is preferable.

  The present invention can be used for a lighting device and a discharge lamp having a tracking countermeasure function.

It is the partial cross section figure which looked at the lamp in the form of execution of this invention from the side. It is a circuit block diagram of the lamp | ramp containing the lighting device which concerns on embodiment. It is a circuit block diagram of the lamp | ramp containing the lighting device which concerns on a modification.

Explanation of symbols

1 lamp 50 lighting device 51 insulating substrate 100 rectifying and smoothing circuit 110 filter circuit 120 inverter circuit P current fuse NF coil filter C5, C8 coupling capacitor Q1, Q2 transistor

Claims (6)

In a lighting device for a discharge lamp in which an electronic component constituting an inverter circuit that generates high-frequency power by switching a DC output from a DC power supply unit and applies it to the discharge lamp is mounted on an insulating substrate.
An inductor and a current fuse are provided in two connection paths connecting the DC power supply unit and the inverter circuit. The lighting device according to claim 1, wherein the inductor forms an LC filter with a capacitor connected to an input side of the inverter circuit. The inverter circuit is formed by connecting a pair of switching elements connected in series and a pair of coupling capacitors connected in series in parallel, the connection point of the pair of switching elements and the connection point of the pair of capacitors And the discharge lamp is connected between
The lighting device according to claim 1, wherein the inductor forms an LC filter with the pair of capacitors. The lighting device according to any one of claims 1 to 3, wherein the DC power supply unit is a rectifier circuit that rectifies power supplied from an AC power supply. The lighting device according to any one of claims 1 to 4, wherein the current fuse is a protective element that is disconnected by a current of 0.5 to 1.2A. In a discharge lamp that is lit by a lighting device incorporated in the interior,
The said lighting device is a lighting device of any one of Claims 1-5. The discharge lamp characterized by the above-mentioned.

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