JPH11238586A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of preventing the reduction in a lamp service life or the application of thermal stress on constituent parts with discharge lamp filaments being overheated or overcooled, when a discharge lamp of a similar outer form with a different rated output is connected. SOLUTION: In a lamp sort detection circuit 5, a current detection means 5a detects a filament current If of a discharge lamp La, and a voltage detection means 5b detects a filament voltage Vf of the discharge lamp La. A determination means 5c determines a filament resistance based on detected values of the filament current If and the filament voltage Vf, and detects the sort of the discharge lamp La based on the filament resistance. A control circuit 6 changes power to be supplied to the discharge lamp La, in accordance with the discharge lamp La connected to a stabilizer 1 based on result of detection by the lamp sort detection circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device.

[0002]

2. Description of the Related Art As a discharge lamp used in this type of discharge lamp lighting device, straight tube fluorescent lamps as shown in Tables 1 and 2 have been conventionally provided. Such a straight tube fluorescent lamp has a different overall length depending on the rated output. In general, the overall length tends to be longer as the rated output increases. In a lighting fixture using a straight tube fluorescent lamp, since the distance between the sockets is fixed to the entire length of the corresponding straight tube fluorescent lamp, the total length (that is, the rated output) of the straight tube fluorescent lamp that can be used by the lighting fixture is determined. A straight tube fluorescent lamp having a different rated output is not attached to a ballast incorporated in a lighting fixture. In addition, depending on the energy-saving type and the difference in the starting method,
Although the rated output may be slightly different even if the total length is the same, such a difference does not cause a problem in the combination of the straight tube fluorescent lamp and the ballast.

[0003]

[Table 1]

[0004]

[Table 2]

[0005] In addition, as shown in FIGS.
In a so-called compact lamp 10 including a substantially U-shaped fluorescent lamp 11, a base 12 provided with a base 14, and a substantially spherical cover 13 covering the fluorescent lamp 11, for example, an FGL9 type (rated output 9W) compact Although the lamp and the compact lamp of FGL13 type (rated output 13W) have substantially the same outer shape and different rated output, there are FGL9
The positions (shapes) of the notches 15a and 15b formed in the base 12 are different between the mold and the FGL13 mold. On the other hand, on the luminaire side, an engaging convex portion is formed to engage with the cutout 15a or 15b formed in the corresponding compact lamp 10 having a rated output, so that a compact lamp having a different rated output is used for the luminaire. It cannot be installed, preventing misuse of the compact lamp.

Further, in a compact fluorescent lamp 10 'as shown in FIG. 17, for example, an EFT9 type (rated output 9W) and an EF
There is a T14 type (rated output 14 W) bulb-type fluorescent lamp 10 ′ that has substantially the same external shape and a different rated output,
In the bulb-type fluorescent lamp 10 ′, a substantially U-shaped fluorescent lamp 11 and a ballast 16 corresponding to the rated output of the fluorescent lamp 11 cover 1.
3, the fluorescent lamp 11 is not used in combination with a ballast having a different rated output.

As shown in Table 3, the same straight tube fluorescent lamp has two rated outputs in a T8 type high frequency lighting dedicated straight tube fluorescent lamp having an outer diameter of about 25.5 mm. ,
It is a double rating type. Therefore, this straight tube fluorescent lamp can be used in combination with a ballast of a lighting fixture corresponding to any rated output. Furthermore, although incandescent lamps have the same outer shape and different rated output, a ballast is not required, so that a predetermined output can be obtained by applying a commercial voltage of a predetermined voltage to the incandescent lamp.

[0008]

[Table 3]

[0009]

Among the above-mentioned fluorescent lamps and incandescent lamps, in the lighting equipment using a straight tube fluorescent lamp, the interval between the sockets is fixed according to the rated output of the corresponding straight tube fluorescent lamp. . Conventional straight tube fluorescent lamps have different lengths according to the rated output, and in general, the longer the rated output, the longer the length. There was no.

However, as shown in Table 4, recently, discharge lamps (a) and (b) having substantially the same outer shape (length, tube diameter, etc.) and different rated outputs have been provided. In a lighting fixture using such a discharge lamp, there is a possibility that a discharge lamp and a ballast having different rated outputs are used in combination. If a discharge lamp and a ballast with different rated outputs are used in combination, the lamp current or filament current will differ from the design value of the discharge lamp, and the filament will be overheated or cooled, and the temperature of the filament will be out of the appropriate temperature range. However, there is a problem that the lamp life is shortened. Further, when the filament is overheated, there is also a problem that the components are subjected to thermal stress.

[0011]

[Table 4]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a discharge lamp lighting device which prevents a reduction in lamp life and stress on components due to incorrect connection. Is to do.

[0013]

In order to achieve the above object, according to the first aspect of the present invention, a first power supply having a predetermined rated output is provided.
In a discharge lamp lighting device provided with a ballast that supplies power to the discharge lamp, a lighting unit that supplies high frequency power to the discharge lamp to light up the discharge lamp at high frequency, and a control unit that controls the power supplied by the lighting unit. A lamp type detecting means for detecting the type of the discharge lamp connected to the ballast, wherein a second discharge lamp having substantially the same outer shape as the first discharge lamp and having a different rated output is connected to the ballast. When the lamp type detecting means detects that the power is supplied to the second discharge lamp, the control means changes the power supplied to the second discharge lamp in accordance with the detection value of the lamp type detecting means, and in accordance with the type of the connected discharge lamp. Since the power supplied to the discharge lamp can be changed, by bringing the power supplied to the second discharge lamp close to the rated output of the second discharge lamp, the filament is not overheated or overcooled,
It is possible to prevent the lamp life from being shortened and the component parts from being subjected to thermal stress due to overheating of the filament.

According to a second aspect of the present invention, when the second discharge lamp having a higher rated output than the first discharge lamp is connected to the ballast, the control means controls the second discharge lamp. In the invention according to claim 3, when the second discharge lamp having a smaller rated output than the first discharge lamp is connected to the ballast, the control means supplies the second discharge lamp to the second discharge lamp. In the invention according to claim 4, a plurality of first discharge lamps are connected to the ballast, and the second discharge lamp having a larger rated output than the first discharge lamp is connected to the ballast. When at least one lamp is connected, the control means increases the power supplied to the discharge lamp. According to the invention of claim 5, a plurality of first discharge lamps are connected to the ballast, When at least one second discharge lamp having a smaller rated output is connected to the ballast, the control means Since the power supplied to the second discharge lamp is reduced, the filament is overheated or supercooled by bringing the power supplied to the second discharge lamp close to the rated output of the second discharge lamp. It is possible to prevent the lamp life from being shortened, and it is possible to prevent heat stress on the components due to overheating of the filament.

According to a sixth aspect of the present invention, in the first to fifth aspects of the present invention, when a second discharge lamp having an appropriate filament current larger than that of the first discharge lamp is connected to the ballast, the control means is activated. The filament current supplied to the discharge lamp is increased. According to the invention of claim 7, when the second discharge lamp having an appropriate filament current smaller than that of the first discharge lamp is connected to the ballast, the control means is released. In the invention according to claim 8, a plurality of first discharge lamps are connected to the ballast, and a filament current having an appropriate value larger than that of the first discharge lamp is connected to the ballast. When at least one of the two discharge lamps is connected to the ballast, the control means increases the filament current supplied to the discharge lamp. According to the invention of claim 9, the ballast includes a plurality of first discharge lamps. Connected and more than the first discharge lamp. When at least one second discharge lamp having a small appropriate value of the lament current is connected to the ballast, the control means reduces the filament current supplied to the discharge lamp. In addition, it is possible to prevent the lamp life from being shortened due to overheating or overcooling of the filament, and to prevent thermal stress on the components due to overheating of the filament.

According to a tenth aspect of the present invention, in any of the first to ninth aspects, the control means controls the lamp power, the lamp voltage, the lamp current, the filament current, or the lamp current and the filament current in accordance with the connected discharge lamp. Since at least one characteristic value of the sum with the current is changed, and the control means changes the characteristic value specific to the discharge lamp,
The stress applied to the discharge lamp can always be reduced.

According to the eleventh aspect of the present invention, the first to tenth aspects are provided.
In the invention, the lamp power detecting means is connected to the ballast using at least one characteristic value of the lamp power, the lamp voltage, the lamp current, the filament current, or the sum of the lamp current and the filament current. Since the type of discharge lamp is detected and the power supplied to the discharge lamp is changed by the control means based on the result of detecting characteristic values specific to the discharge lamp, it is possible to always reduce the stress applied to the discharge lamp. it can.

According to a twelfth aspect of the present invention, in the eleventh aspect of the present invention, the control means changes a characteristic value other than the characteristic value used by the lamp type detecting means for detecting the type of the discharge lamp. The type of the discharge lamp can be detected by using the characteristic value that is less affected by the discharge lamp, and the type of the discharge lamp can be accurately detected. In the invention of claim 13,
According to the eleventh aspect of the present invention, since the control unit changes the same characteristic value as the characteristic value used by the lamp type detection unit to detect the type of the discharge lamp, feedback control of the characteristic value changed by the control unit is performed. In this case, the detecting means used for detecting the type of the discharge lamp by the lamp type detecting means can be used as the detecting means for performing the feedback control, and the control means can be configured at a low cost.

According to the fourteenth aspect, the first to thirteenth aspects are described.
In the invention of the first aspect, the outer diameter of the glass tubes of the first and second discharge lamps is about 17 mm or less, and the distance between the filament and the glass tube is short in a small-diameter discharge lamp. However, by preventing overheating of the filament, the temperature rise of the glass tube can be prevented.

According to a fifteenth aspect of the present invention, in the first aspect of the present invention, a filament characteristic detecting means for detecting a filament characteristic of the discharge lamp connected to the ballast is provided, and the control means controls the filament characteristic according to the detected value of the filament characteristic. The power supplied to the discharge lamp is changed so as to substantially match the rated output of the connected discharge lamp.
In the invention of the fifth aspect, since the filament characteristic is the filament resistance, the type of the discharge lamp can be detected from the detected value of the filament characteristic, and the power supplied to the discharge lamp can be changed.

[0021]

Embodiments of the present invention will be described with reference to the drawings.
I will explain. (Embodiment 1) A circuit diagram of a discharge lamp lighting device of the present embodiment is shown.
As shown in FIG. This discharge lamp lighting device is a low-pass filter
Commercial power supply V input via F_ACRectifier D for rectifying
B and a capacitor for smoothing the output voltage of the rectifier DB
Sa C ₁And a capacitor C₁Both
Switch consisting of MOSFETs connected in series between the ends
Element Q₁, Q_TwoDC by alternately turning on and off
The DC voltage of the power supply unit 2 is converted into a high-frequency voltage to load circuit 4
Connected to the inverter circuit 3 and the ballast 1
A lamp type detecting means for detecting the type of the discharge lamp La;
Pump type detection circuit 5 and switching element Q₁, Q_Twoof
A control circuit 6 serving as control means for controlling on / off;
Switching element Q by the output signal of path 6₁, Q_TwoDrive
A ballast 1 comprising a driver circuit 7
And the control circuit 6 has the switching element Q₁, Q_TwoMovement
By controlling the operation frequency and on-duty,
The power supplied to the electric lamp La can be controlled. What
The DC power supply unit 2, the inverter circuit 3, and the load circuit 4
Lighting means is configured.

Here, the load circuit 4 is connected to the power supply side terminals of both filaments f ₁ and f ₂ via a series circuit comprising an inductor L ₁ and a DC cut capacitor C ₂ between both ends of a low side switching element Q _2. resonates at There and connected to the discharge lamp La, the discharge lamp both filaments f ₁ of La, and a capacitor C ₃ for preheating connected between the non-power supply side terminal of the f _2, an inductor L ₁ and capacitor C ₃ A circuit is formed.

The lamp type detecting circuit 5 is a current detecting means 5a for detecting a filament current If flowing through the discharge lamp La.
A voltage detecting means 5b for detecting a filament voltage Vf of the discharge lamp La; a current detecting means 5a and a voltage detecting means 5
a determination means 5c for determining the type of the discharge lamp La by obtaining the filament resistance Rf (Vf / If) from the detected value of b, and the discharge lamps La having substantially the same outer shape and having different rated outputs are stable. When connected to the lamp 1, the lamp type detection circuit 5 determines the filament resistance Rf of the discharge lamp La, and detects the type of the discharge lamp La from the filament resistance Rf. The lamp type detecting circuit 5 operates as a filament characteristic detecting means for detecting a filament characteristic (that is, a filament resistance).

The current detecting unit 5a is a current transformer C provided between the capacitor C ₃ and the filament f ₂
It consists T and the variable resistor VR ₁ and the buffer amplifier A ₁ Tokyo, buffer amplifier A ₁ outputs the voltages V ₁ proportional to the filament current If. Voltage detecting means 5b is provided with a variable resistor VR ₂ connected between the power supply side terminal of the filament f ₂ of the discharge lamp La and the non-power-side terminal, made from the buffer amplifier A ₂ Prefecture, buffer amplifier A ₂ filament f
Voltage V ₂ proportional to the filament voltage Vf generated in the ₂
Is output.

The determination unit 5c is by dividing the output voltage V ₂ of the voltage detection means 5b in the output voltage V ₁ of the current detecting means 5a, a divider 8 for outputting a voltage V ₃ which is proportional to the filament resistance Rf, division composed of the comparator CP ₁ Metropolitan comparing the magnitude of the output voltage V ₃ and the threshold voltage Vsh vessels 8. Here, as shown in FIG. 2, when the output voltage V _{3 of the} divider 8 is smaller than the threshold voltage Vsh,
The output V ₄ of the comparator CP ₁ is high (H), and when the output voltage V ₃ of the divider 8 greater than the threshold voltage Vsh, the output V ₄ of the comparator CP ₁ is low (L)
Becomes Thus, the filament resistance Rf of the discharge lamp La changes according to the type (rated output) of the discharge lamp La.
The lamp type detection circuit 5 determines the filament resistance R from the two characteristic values of the filament current If and the filament voltage Vf.
seeking f, and detects the type of the discharge lamp La from the filament resistance Rf, the control circuit 6 is changing the power supplied to the discharge lamp La in response to the output V ₄ of the lamp type detection circuit 5. As described above, since the control circuit 6 changes the characteristic value (that is, the lamp power) different from the characteristic value used for the detection by the lamp type detection circuit 5, the characteristic value which is less affected by the operation of the ballast 1 is used. The type of the discharge lamp La connected to the ballast 1 can be detected, and the type of the discharge lamp La can be accurately detected.

As shown in FIG.₀Stable in
When the device 1 starts the discharge lamp La, first, at time t₀~ T₁To
Here, the control circuit 6 controls the inverter circuit 3 at the frequency fa.
When the lamp type detecting means 5 is operated, the discharge lamp L
a, the filament resistance Rf of the
The type of the discharge lamp La is determined from the resistance Rf. Then the time
t₁~ T_TwoThe control circuit 6 operates the inverter circuit 3
The operating frequency f is reduced from fa to fb, and the discharge lamp La
Lament f₁, F_TwoAt the time t _Twosmell
To start the discharge lamp La. Time t_TwoAfter that, the control circuit
6 according to the detection result of the lamp type detection circuit 5,
By operating the barter circuit 3 at the frequency fc, the type of the discharge lamp La
The power corresponding to the type is supplied to the discharge lamp La.

As described above, the lamp type detection circuit 5 detects the type of the discharge lamp La, and the control circuit 6 changes the power supplied to the discharge lamp La according to the detection value of the lamp type detection circuit 5. ing. For example, as shown in FIG. 4, when there are two types of first and second discharge lamps La ₁ and La ₂ having substantially the same outer shape and different rated outputs, the first and second discharge lamps La ₁ and La ₂ have the same spacing. And the second discharge lamps La ₁ , L
a ₂ can be connected, so that the first discharge lamp La ₁
It can be attached to the second discharge lamp La ₂ luminaire 20 having a ballast 1 which corresponds to the rated output. Therefore, the second discharge lamp La ₂ having a different rated output is used for the lighting fixture 2.
0 may be erroneously connected, but even if the second discharge lamp La ₂ having a different rated output is connected to the lighting fixture 20, the lamp type detection circuit 5 is connected to the ballast 1 and the discharge lamp La is connected to the ballast 1.
And the control circuit 6 changes the power supplied to the discharge lamp La, so that the filament of the discharge lamp La is not overheated or overcooled, and the lamp life is reduced or the filament is overheated. Accordingly, it is possible to prevent the components from being subjected to thermal stress.

[0028] In the discharge lamp lighting apparatus (Embodiment 2) Embodiment 1, which had been connected to one lamp of the discharge lamp La in ballast 1, as shown in FIG. 13, the first discharge lamp La ₁ The first discharge lamp La ₁ is attached to the lighting fixture 20 including the corresponding ballast _1.
May be connected to a plurality of lights (for example, four lights).
Note that the basic configuration and operation of the discharge lamp lighting device are the same as those of the first embodiment, and a description thereof will be omitted.

[0029] Here, equal first discharge lamp La ₁ and outer, and, when the second discharge lamp La ₂ having different rated output is connected at least one lamp to luminaire 20, the lamp type detection circuit 5 The control circuit 6 detects that the second discharge lamp La ₂ having a different rated output is connected to the ballast 1, and changes the output power of the inverter circuit 3 according to the detection result of the lamp type detection circuit 5.

For example, when at least one _second discharge lamp La ₂ having a higher rated output than the first discharge lamp La ₁ is erroneously connected to the lighting fixture 20, the ballast 1 outputs the output of the inverter circuit 3. The rated output of the first discharge lamp La ₁ is
The discharge lamp La ₁ is rated lighting. Therefore, compared with the case where the ballast ₁ dims the _first discharge lamp La ₁ ,
The difference between the output and the second rated output of the discharge lamp La ₂ of the inverter circuit 3 can be reduced, the second discharge lamp La ₂
In this case, the damage of the second discharge lamp La ₂ due to the insufficient temperature of the filament can be reduced, and the life of the second discharge lamp La ₂ can be prevented from being shortened.

Further, the first discharge lamp La₁Than rated output
Second discharge lamp La_TwoIs at least at lighting fixture 20
If one lamp is connected incorrectly, the ballast 1
3 of the second discharge lamp La_TwoIs dimmed. Accordingly
And the ballast 1 is the first discharge lamp La₁When the rated lighting
And the output of the inverter circuit 3 and the second discharge lamp La
_TwoThe difference between the rated output of
Light La_TwoDischarge lamp L due to overheating of the filament
a_TwoOf the second discharge lamp La_TwoLife expectancy
Shortening can be prevented.

(Embodiment 3) FIG. 14 is a circuit diagram of a discharge lamp lighting device according to this embodiment. Since the basic configuration and operation are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted. In the first embodiment, the lamp type detection circuit 5 obtains the filament resistance Rf from the detected values of the filament current If and the filament voltage Vf, and determines the type of the discharge lamp La from the filament resistance Rf. The lamp type detection circuit 5 determines the type of the discharge lamp La from only the detected value of the lamp current Ila flowing through the discharge lamp La. In this embodiment, both filaments f ₁ and f _{2 of the} discharge lamp La are used.
Are provided with preheating means 9a and 9b, respectively.
Here, the control circuit 6 determines that the lamp type detection circuit 5 is the discharge lamp L
Since the same characteristic value (lamp current Ila) as the characteristic value (lamp current Ila) used for detecting the type of a is changed, when the control circuit 6 performs the feedback control of the lamp current Ila, the type of the discharge lamp La is changed. The detection means used for the detection and the detection means for performing the feedback control can also be used, and the discharge lamp lighting device can be configured at low cost.

The lamp type detection circuit 5 detects the lamp current Ila
And a determining means 5c for determining the type of the discharge lamp La from the detected value of the lamp current detecting means 5a '. Lamp current detecting means 5
a ′ includes a current transformer CT provided on a filament f ₂ of the discharge lamp La, a variable resistor VR _1, and a buffer amplifier A _{1. The} buffer amplifier A ₁ outputs a voltage V ₁ proportional to the lamp current Ila. Output. Judgment means 5c
Compares the output voltage V ₁ of the lamp current detection means 5a 'and the threshold voltage Vsh, comprised of a comparator CP ₁ for discriminating the type of the discharge lamp La. Here, the output V ₁ of the lamp current detecting means 5 a ′ is the threshold voltage V
If less than sh, if the output V ₄ of the determination unit 5c becomes high (H), the output V ₁ of the lamp current detection means 5a 'is larger than the threshold voltage Vsh is judging means 5
the output V ₄ of c becomes low (L), the output V ₄ of the determination unit 5c varies according to the type of the discharge lamp La.

Here, when there are discharge lamps La having substantially the same outer shape and different rated outputs (ie, lamp currents Ila), the control circuit 6 outputs the output of the inverter circuit 3 in accordance with the detection result of the lamp type detection circuit 5. Therefore, even when a discharge lamp La having a different rated output is connected to the ballast 1, the control circuit 6 controls the discharge lamp L according to the type of the discharge lamp La.
it is possible to change the power supplied to a, prevention or lamp life is decreased by overheating or undercooling of the filament f _1, f _2, the configuration thermal stress from being applied to the component by overheating of the filament f _1, f ₂ it can.

The control circuit 6 includes a lamp type detection circuit 5
, The type of the discharge lamp La is detected once from the lamp current Ila of the discharge lamp La after the discharge lamp La is turned on, and the detection result is held until the discharge lamp La is turned off. (Embodiment 4) FIG. 15 is a circuit diagram of a discharge lamp lighting device according to this embodiment. In this circuit, in the discharge lamp lighting device of the third embodiment, the control circuit 6 controls the filament voltage of the preheating means 9a, 9b according to the detection value of the lamp type detection circuit 5. Note that the control circuit 6 controls the preheating means 9a, 9
Except for controlling b, it is the same as the discharge lamp lighting device according to the third embodiment described above, and therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

The outer shapes are substantially equal and the rated output (
First and second discharge lamps La having different lamp currents Ila)
₁, La_TwoAnd the first discharge lamp La₁And the second discharge lamp
La _TwoIf the appropriate value of the filament current differs between
The lamp type detection circuit 5 detects the type of the discharge lamp connected to the ballast 1.
After detecting the type, the control circuit 6 controls the preheating means 9a and 9b.
Control the filament current according to the type of discharge lamp.
I'm making it.

If the sum of the filament current and the lamp current Ila differs between the _first discharge lamp La ₁ and the second discharge lamp La ₂ , the lamp type detection circuit 5 is connected to the ballast 1. After detecting the type of the discharged discharge lamp, the control circuit 6
May control the preheating means 9a and 9b to change the filament current according to the type of the discharge lamp, or may change the lamp current Ila instead of changing the filament current, or the filament current and the lamp. Both the current Ila and the current Ila may be changed.

By the way, in each of the above embodiments,
As shown in FIG. 5, the rated output W _{1 of the first} discharge lamp La ₁
If also large second discharge lamp rated output W ₂ of La ₂ is more, the second discharge lamp La ₂ is erroneously connected to the ballast 1 which corresponds to the first discharge lamp La _1, the lamp type detection circuit 5 detects that the first discharge lamp La ₁ discharge lamp La ₂ large second rated output than is connected to the ballast 1 from the second discharge lamp La ₂ of filament resistance Rf and the lamp current Ila The control circuit 6 stops the operation of the inverter circuit 3 according to the detection result of the lamp type detection circuit 5, and makes the output Wb of the inverter circuit 3 zero. Thus, if rated output W ₂ of the connected second discharge lamp La ₂ is greater than the rated output W ₁ of the first discharge lamp La ₁ corresponding, and the output Wb of the inverter circuit 3 to zero Therefore, it is possible to prevent the lamp life of the _second discharge lamp La ₂ from being shortened due to insufficient filament temperature or the like.

Here, as shown in FIG. 6, the output Wb of the inverter circuit 3 is the rated output W _{1 of the first} discharge lamp La _1.
Is controlled variably within the dimming range B ₁ including the following, the control circuit 6 sets the output Wb of the inverter circuit 3 to the maximum within the dimming range B ₁ instead of setting the output Wb of the inverter circuit 3 to zero. , it may be to reduce the difference between the second discharge lamp La ₂ output Wb of the rated output W ₂ and the inverter circuit 3. Further, as shown in FIG. 7, the output Wb of the inverter circuit 3 is variably controlled by the first and second discharge lamps La _1, rated output W ₁ of the La _2, W dimming containing ₂ range B within ₂ If that is, the control circuit 6 may be controlled output Wb of the inverter circuit 3 to the rated output W ₂ of the second discharge lamp La _2. Further, as shown in FIG.
b is the first discharge lamp if La is variably controlled in the dimming range B ₃ including ₁ of the rated output W _1, the control circuit 6 is the minimum value of the output Wb dimming range B ₃ of the inverter circuit 3 controlled to a value greater than may be controlled to be close to the rated output W ₂ of the second discharge lamp La ₂ than the minimum value of the dimming range B _3, first the under-temperature of the filament in the same manner as described above 2 can be prevented from shortening the lamp life of the discharge lamp La ₂ .

On the other hand, as shown in FIG.
a₁Rated output W₁Than the second discharge lamp La_TwoRated out of
Force W_TwoIs smaller, the first discharge lamp La₁Cheap corresponding to
The second discharge lamp La_TwoIs incorrectly connected, the lamp
The type detection circuit 5 includes a second discharge lamp La_TwoFilament filament
From the anti-Rf or lamp current Ila, the first discharge lamp La₁Yo
2nd discharge lamp La with small rated output_TwoBecomes ballast 1
The connection is detected, and the control circuit 6 detects the lamp type.
The operation of the inverter circuit 3 is stopped according to the detection result of the circuit 5.
And the output Wb of the inverter circuit 3 is set to zero. this
As described above, the second discharge lamp La connected to the ballast 1_TwoConstant
Rating output W_TwoCorresponds to the first discharge lamp La ₁Rated output W
₁If it is smaller, the control circuit 6
Since the output Wb is set to zero, the second discharge lamp La_TwoOver
When current flows and the filament overheats,
Discharge lamp La_TwoLamp life is shortened,
Heat stress can be prevented.

Here, as shown in FIG. 10, the output Wb of the inverter circuit 3 is the rated output W of the _first discharge lamp La _1.
If is variably controlled by the dimming range B ₄ containing _1, control circuit 6 instead of the zero output Wb of the inverter circuit 3, minimum and an inverter circuit 3 outputs Wb dimming range B within _4, it may be to reduce the difference between the output Wb of the second discharge lamp La ₂ of the rated output W ₂ and the inverter circuit 3. Further, as shown in FIG. 11, the output Wb of the inverter circuit 3 is variably controlled by the first and second discharge lamps La _1, rated output W ₁ of the La _2, W ₂ dimming range B ₅ comprising Control circuit 6 outputs the output Wb of the inverter circuit 3 to the second
It may be controlled to the rated output W ₂ of the discharge lamp La _2. Further, as shown in FIG.
b is the maximum value of the first discharge lamp if La is variably controlled by the dimming range B ₆ comprising the rated output W ₁ of _1, the control circuit 6 is an output Wb dimming range of the inverter circuit 3 B ₆ controlled to a small value, dimming range than the maximum value of B ₆ may be controlled to be close to the rated output W ₂ of the second discharge lamp La _2, a second discharge in the same manner as described above lamp La ₂ Overcurrent flows through the
When the filament is overheated, the second discharge lamp L
or lamp life is shortened in a _2, a thermal stress is applied to the component can be prevented.

The above-described first and second discharge lamps La
₁ and La ₂ , the same relationship as the rated outputs W ₁ , W ₂ and the power Wb supplied by the ballast is obtained by the first and second discharge lamps L.
a _1, the filament current the If ₁ of La _2, if the appropriate value and ballast 1 the If ₂ holds the filament current Ifb supplied, the control circuit 6 may be controlled filament current Ifb in the same manner as described above, overheating of the filaments Alternatively, it is possible to prevent lamp life from being shortened by overcooling. The first and second discharge lamps La _1, rated output W ₁ of the La _2, W ₂ and ballast same relationship as power Wb supplied by other lamp voltage described above, the lamp current, the lamp current The same applies to the case where the characteristic value such as the sum with the filament current is satisfied.

The first and second discharge lamps La ₁ , La ₁ ,
For La _2, the outer shape of the glass tube is approximately 17 mm or less.
As shown in the figure, since the outer diameter of the glass tube is a so-called T5 type fluorescent lamp having a diameter of about 16 mm, the distance between the filament and the glass tube is short because the tube diameter is small, and the temperature rise of the glass tube near the filament is large. Since the filament is prevented from being overheated as described above, it is possible to prevent the temperature of the glass tube from rising and to prevent heat stress from being applied.

The ballast 1 is connected to the connected discharge lamp La.
It is sufficient to change at least one characteristic value of the lamp power, the lamp voltage, the lamp current, the filament current, or the sum of the lamp current and the filament current in accordance with the following. , The stress applied to the discharge lamp La can always be reduced. Further, the lamp type detection circuit 5 outputs the lamp power,
The discharge lamp L connected to the ballast 1 using at least one characteristic value of the lamp voltage, the lamp current, the filament current, or the sum of the lamp current and the filament current.
The type of a may be detected, and the ballast 1 changes the output based on the result of detecting the characteristic value unique to the discharge lamp La, so that the stress applied to the discharge lamp La can be reduced at all times.

[0045]

As described above, according to the first aspect of the present invention, there is provided a discharge lamp lighting device provided with a ballast for supplying power to a first discharge lamp having a predetermined rated output. A lighting means for supplying and lighting the discharge lamp at high frequency; a control means for controlling the power supplied by the lighting means; and a lamp type detecting means for detecting the type of the discharge lamp connected to the ballast. When the lamp type detecting means detects that the second discharge lamp having the same outer shape as the discharge lamp and having a different rated output is connected to the ballast, the control means responds to the detected value of the lamp type detecting means. Since the power supplied to the second discharge lamp is changed, and the control means can change the power supplied to the discharge lamp in accordance with the connected discharge lamp, the power supplied to the second discharge lamp is changed. Close to the rated output of the second discharge lamp It allows the filament can be overheating or subcooled by lamp life to prevent deterioration, moreover there is an effect that can prevent thermal stress from being applied to the component by overheating of the filament.

According to a second aspect of the present invention, when the second discharge lamp having a higher rated output than the first discharge lamp is connected to the ballast,
The control means increases the power supplied to the second discharge lamp, and the invention according to claim 3 is characterized in that when the second discharge lamp having a smaller rated output than the first discharge lamp is connected to the ballast, the control means Is the second
The power supplied to the discharge lamp is reduced, and in the invention according to claim 4, a plurality of first discharge lamps are connected to the ballast,
When at least one second discharge lamp having a higher rated output than the first discharge lamp is connected to the ballast, the control means increases the power supplied to the discharge lamp. Is connected to a plurality of first discharge lamps, and when at least one second discharge lamp having a smaller rated output than the first discharge lamp is connected to the ballast, the control means supplies the discharge lamp to the discharge lamp Since the power is reduced, the filament is overheated or supercooled by bringing the power supplied to the second discharge lamp close to the rated output of the second discharge lamp, as in the first aspect of the invention, so that the lamp life is shortened. Is prevented from being reduced, and furthermore, it is possible to prevent a component from being subjected to thermal stress due to overheating of the filament.

According to a sixth aspect of the present invention, when the second discharge lamp having a proper filament current value larger than that of the first discharge lamp is connected to the ballast, the control means increases the filament current supplied to the discharge lamp. According to a seventh aspect of the present invention, when a second discharge lamp having an appropriate filament current value smaller than that of the first discharge lamp is connected to the ballast, the control means reduces the filament current supplied to the discharge lamp. According to an eighth aspect of the present invention, in the ballast, a plurality of first discharge lamps are connected to the ballast.
Of which the appropriate value of the filament current is larger than that of the discharge lamp of
When at least one discharge lamp is connected to the ballast, the control means increases the filament current supplied to the discharge lamp,
According to a ninth aspect of the present invention, a plurality of first discharge lamps are connected to the ballast, and at least one second discharge lamp having an appropriate filament current smaller than the first discharge lamp is connected to the ballast. Then, since the control means reduces the filament current supplied to the discharge lamp, it is possible to prevent the filament from being overheated or overcooled and the lamp from being lowered by bringing the filament current close to an appropriate value. Moreover, there is an effect that thermal stress can be prevented from being applied to the component parts due to overheating of the filament.

According to a tenth aspect of the present invention, the control means controls at least one of the lamp power, the lamp voltage, the lamp current, the filament current, or the sum of the lamp current and the filament current according to the connected discharge lamp. Since at least one characteristic value is changed and the control means changes the characteristic value specific to the discharge lamp, there is an effect that the stress applied to the discharge lamp can be reduced at all times.

According to an eleventh aspect of the present invention, the lamp type detecting means uses at least one characteristic value of a lamp power, a lamp voltage, a lamp current, a filament current, or a sum of the lamp current and the filament current. The control means changes the power supplied to the discharge lamp based on the result of detection of the characteristic value of the discharge lamp connected to the ballast. There is an effect that such stress can be reduced.

According to a twelfth aspect of the present invention, since the control means changes the characteristic value other than the characteristic value used by the lamp type detection means for detecting the type of the discharge lamp, the characteristic value which is less affected by the operation of the control means is used. It is possible to detect the type of the discharge lamp by using this, and there is an effect that the type of the discharge lamp can be accurately detected. According to the thirteenth aspect, since the control unit changes the same characteristic value as the characteristic value used by the lamp type detection unit to detect the type of the discharge lamp, feedback control of the characteristic value changed by the control unit is performed. In this case, the lamp type detecting means can double as the detecting means used for detecting the type of the discharge lamp and the detecting means for performing the feedback control, and the ballast can be constructed at a low cost. .

According to a fourteenth aspect of the present invention, since the outer diameters of the glass tubes of the first and second discharge lamps are approximately 17 mm or less, and the distance between the filament and the glass tube is short in a small-diameter discharge lamp,
Although the temperature rise of the glass tube near the filament is large, there is an effect that the temperature rise of the glass tube can be prevented by preventing the filament from overheating. According to a fifteenth aspect of the present invention, a filament characteristic detecting means for detecting a filament characteristic of the discharge lamp connected to the ballast is provided, and the control means determines a rated output of the connected discharge lamp in accordance with a detected value of the filament characteristic. The power supplied to the discharge lamp is changed so as to be substantially the same. According to the invention of claim 16, since the filament characteristic is the filament resistance, the power supplied from the filament resistance to the discharge lamp can be changed. There is.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating a discharge lamp lighting device according to a first embodiment.

FIG. 2 is a waveform chart illustrating the operation of the above.

FIG. 3 is a waveform diagram illustrating an operation at the time of starting the lamp of the above.

FIG. 4 is a schematic configuration diagram showing a discharge lamp lighting device of the above.

FIG. 5 is a diagram illustrating a relationship between a rated output and a supply output of a discharge lamp of the discharge lamp lighting device according to the first to fourth embodiments.

FIG. 6 is a diagram showing a relationship between a rated output and a supply output of the discharge lamp.

FIG. 7 is a diagram showing a relationship between a rated output and a supply output of the discharge lamp.

FIG. 8 is a diagram showing a relationship between a rated output and a supply output of the discharge lamp.

FIG. 9 is a diagram showing a relationship between a rated output and a supply output of the above discharge lamp.

FIG. 10 is a diagram showing a relationship between a rated output and a supply output of the discharge lamp.

FIG. 11 is a diagram showing a relationship between a rated output and a supply output of the discharge lamp.

FIG. 12 is a diagram showing a relationship between a rated output and a supply output of the above discharge lamp.

FIG. 13 is a schematic configuration diagram illustrating a discharge lamp lighting device according to a second embodiment.

FIG. 14 is a circuit diagram showing a discharge lamp lighting device according to a third embodiment.

FIG. 15 is a circuit diagram illustrating a discharge lamp lighting device according to a fourth embodiment.

16A and 16B show a compact lamp used for a conventional discharge lamp lighting device, wherein FIG. 16A is a partially cutaway front view, and FIG. 16B is a top view.

FIG. 17 is a front view showing a compact fluorescent lamp used in the lighting system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ballast 5 lamp type detection circuit 5 a current detection means 5 b voltage detection means 5 c determination means 6 control circuit La discharge lamp If filament current Vf filament voltage

Claims (16)

[Claims] 1. A discharge lamp lighting device comprising a ballast for supplying power to a first discharge lamp having a predetermined rated output,
Lighting means for supplying high-frequency power to the discharge lamp to light the discharge lamp at high frequency; control means for controlling the power supplied by the lighting means; and lamp type detection means for detecting the type of discharge lamp connected to the ballast. When the lamp type detecting means detects that a second discharge lamp having substantially the same outer shape as the first discharge lamp and having a different rated output is connected to the ballast, the control means sets the lamp type detecting means. A discharge lamp lighting device, wherein the power supplied to the second discharge lamp is changed according to the detected value of the discharge lamp. 2. A second discharge lamp having a higher rated output than the first discharge lamp.
The discharge lamp lighting device according to claim 1, wherein when the discharge lamp is connected to the ballast, the control means increases the power supplied to the second discharge lamp. 3. A second discharge lamp having a smaller rated output than the first discharge lamp.
The discharge lamp lighting device according to claim 1, wherein when the discharge lamp is connected to the ballast, the control means reduces the power supplied to the second discharge lamp. 4. A ballast is connected to a plurality of first discharge lamps. When at least one second discharge lamp having a higher rated output than the first discharge lamp is connected to the ballast, control is performed. 2. The discharge lamp lighting device according to claim 1, wherein the means increases power supplied to the discharge lamp. 5. A ballast is connected to a plurality of first discharge lamps, and when at least one second discharge lamp having a smaller rated output than the first discharge lamp is connected to the ballast, control is performed. 2. The discharge lamp lighting device according to claim 1, wherein the means reduces power supplied to the discharge lamp. 6. The control means increases the filament current supplied to the discharge lamp when a second discharge lamp having an appropriate filament current value larger than that of the first discharge lamp is connected to the ballast. The discharge lamp lighting device according to claim 1. 7. When a second discharge lamp having an appropriate filament current smaller than that of the first discharge lamp is connected to the ballast, the control means reduces the filament current supplied to the discharge lamp. The discharge lamp lighting device according to claim 1. 8. A ballast is connected to a plurality of first discharge lamps, and at least one second discharge lamp having an appropriate filament current larger than the first discharge lamp is connected to the ballast. 6. The discharge lamp lighting device according to claim 1, wherein the control means increases a filament current supplied to the discharge lamp. 9. A ballast is connected to a plurality of first discharge lamps, and at least one second discharge lamp having an appropriate filament current smaller than the first discharge lamp is connected to the ballast. 6. The discharge lamp lighting device according to claim 1, wherein the control means reduces a filament current supplied to the discharge lamp. 10. The control means according to the connected discharge lamp, comprises at least one characteristic value of a lamp power, a lamp voltage, a lamp current, a filament current, or a sum of the lamp current and the filament current. 10. The discharge lamp lighting device according to claim 1, wherein: 11. The lamp type detecting means is connected to the ballast using at least one characteristic value of lamp power, lamp voltage, lamp current, filament current, or the sum of lamp current and filament current. The discharge lamp lighting device according to claim 1, wherein the type of the discharge lamp is detected. 12. The discharge lamp lighting device according to claim 11, wherein the control means changes a characteristic value other than the characteristic value used by the lamp type detection means for detecting the type of the discharge lamp. 13. The discharge lamp lighting device according to claim 11, wherein the control means changes the same characteristic value as the characteristic value used by the lamp type detecting means for detecting the type of the discharge lamp. 14. The discharge lamp lighting device according to claim 1, wherein the outer diameter of the glass tubes of the first and second discharge lamps is about 17 mm or less. 15. A filament characteristic detecting means for detecting a filament characteristic of a discharge lamp connected to a ballast, wherein the control means substantially matches a rated output of the connected discharge lamp in accordance with a detected value of the filament characteristic. The discharge lamp lighting device according to claim 1, wherein the power supplied to the discharge lamp is changed so as to perform the operation. 16. The discharge lamp lighting device according to claim 15, wherein the filament characteristic is a filament resistance.