JP2003045686A - Discharge lamp lighting device and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device achieving high efficiency. SOLUTION: A fluorescent lamp FL has a discharge path length of 1200 mm or more and an inside diameter of 20 mm or less. By increasing the lamp length, the degree of loss caused by a cathode voltage drop is reduced to enhance the lamp efficiency. When the fluorescent lamp FL is lighted under rated conditions, If1/IL is equal to or less than one, whereby the power consumed by filaments FLa and FLb can be reduced. Preheating of the fluorescent lamp FL is facilitated by increasing the filament current If2, and If2/IL is preferably equal to or greater than 1.3. If/IL can be equal to or less than one and If2/IL can be equal to or greater than 1.3 when an effective value Vac for the basic wave component of the output voltage of an inverter circuit 25 is equal to or greater than 250 V. By lighting the lamp under these conditions, efficiency is enhanced and the heating conditions of the filaments FLa and FLb can be optimized.

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 and a lighting device.

[0002]

2. Description of the Related Art Heretofore, a discharge lamp lighting device of this type has a high efficiency, for example, for each circuit configuration of the discharge lamp lighting device, and the discharge lamps lit by the discharge lamp lighting device are discharge lamps. However, the circuit configuration of the discharge lamp lighting device, which has a close relationship with the discharge lamp lighting device, and the discharge lamp that is lit by this circuit configuration are not combined to achieve high efficiency.

[0003]

For this reason, although high efficiency can be achieved as a circuit configuration or discharge lamp, respectively, the overall efficiency can be improved due to the relationship between the circuit configuration and the discharge lamp. Is desired.

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 and an illuminating device for improving efficiency.

[0005]

A discharge lamp lighting device according to claim 1 is a switching device; and the discharge path length is 1200 m.
A resonance load circuit of an inductor and a capacitor, to which a discharge lamp having a filament with an electric power of 0.35 W / cm or less per unit length at the time of lighting is connected, the operating frequency at the time of lighting operation. Is constant and Vac is the effective value of the fundamental wave component of the output, Vac
If ≧ 250 V, the lamp current during lighting is IL, the filament current during lighting is If1, and the filament current during preheating before starting the discharge lamp is If2, If1 / IL ≦ 1,
If2 / IL ≧ 1.3, the voltage of the DC power supply is converted into a high frequency voltage by the switching device and the resonance load circuit and supplied to the discharge lamp, and the discharge path length is 1200.
mm or more, inner diameter of 20 mm or less, power of 0.35 W / cm or less per unit length at the time of lighting, the discharge lamp is efficient, and the operating frequency at the time of lighting operation is constant, and the fundamental wave component of the output is effective. When the value is Vac, Vac ≧ 250V
When the lamp current during lighting is IL, the filament current during lighting is If1, and the filament current during preheating before starting the discharge lamp is If2, If1 / IL ≦ 1, If2 / IL ≧
By setting 1.3, sufficient preheating can be performed while reducing the filament power during lighting.

A discharge lamp lighting device according to a second aspect of the present invention includes a switching device; a resistance value of an electrode in a room temperature state is Rc, and a preheating current of 1.3 to 1.8 times the lamp current at the time of lighting is applied.
The resistance value of the electrode when flowing for two seconds is Rh, and Rh / Rc ≧ 4
A resonance load circuit of an inductor and a capacitor to which a discharge lamp having an electrode is connected; the filament current during preheating before starting the discharge lamp is set to 1.3 to 1.8 times the lamp current of the discharge lamp. However, the filament current at the time of lighting the discharge lamp is 1.0 times or less the lamp current, the voltage of the DC power supply is converted to a high frequency voltage by the switching device and the resonance load circuit, and the high frequency voltage is supplied to the discharge lamp. The resistance value of the electrode is Rc, the resistance value of the electrode when a preheating current 1.3 to 1.8 times the lamp current at the time of lighting is Rh, and the electrode of Rh / Rc ≧ 4 is connected to the discharge lamp. Set the filament current at the time of preheating before starting to 1.3 times to 1.8 times the lamp current of the discharge lamp, and make the filament current at lighting of the discharge lamp 1.0 times or less of the lamp current. This optimizes the heating of the filament of the discharge lamp both during preheating before starting the discharge lamp and during lighting of the discharge lamp.

A discharge lamp lighting device according to a third aspect of the present invention comprises a switching device; a resistance value of an electrode at room temperature is Rc, and a preheating current of 1.3 to 1.8 times the lamp current during lighting is applied. A resonance load circuit of an inductor and a capacitor to which a discharge lamp having an electrode having an electrode temperature of 850 ° C. or higher is connected; the filament current at the time of preheating before starting the discharge lamp as the lamp current of the discharge lamp. Three
Double to 1.8 times, the filament current at the time of lighting the discharge lamp is 1.0 times or less of the lamp current, and the switching device and the resonance load circuit convert the voltage of the DC power supply into a high frequency voltage to discharge the lamp. To supply
Before starting the discharge lamp, the electrode whose resistance at room temperature is Rc and whose temperature is 850 ° C or higher when a preheating current of 1.3 to 1.8 times the lamp current during lighting is applied The filament current at the time of preheating is set to 1.3 to 1.8 times the lamp current of the discharge lamp, and the filament current at the time of lighting the discharge lamp is set to 1.0 times or less of the lamp current. The heating of the filament of the discharge lamp is optimized both during preheating before starting and during lighting of the discharge lamp.

A discharge lamp lighting device according to a fourth aspect of the present invention includes a direct current power source having a variable output voltage; a resonance load circuit of an inductor and a capacitor to which a switching device and a discharge lamp having an electrode are connected. An inverter circuit for converting the voltage of the DC power supply into a high frequency voltage and supplying it to the discharge lamp by the switching device and the resonance load circuit while keeping the preheating voltage constant during preheating; and the output voltage of the discharge lamp electrode of the DC power supply during preheating. And a control means for increasing the output voltage when the discharge lamp is lit,
Even with a constant preheating voltage, it is possible to secure a sufficient preheating current by making the output voltage of the electrodes of the discharge lamp of the DC power source during preheating higher than the output voltage of the discharge lamp during lighting.

A discharge lamp lighting device according to a fifth aspect of the present invention includes a direct current power source having a variable output voltage; a resonance load circuit of an inductor and a capacitor to which a discharge lamp having a switching device and an electrode is connected, and An inverter circuit for converting the voltage of the DC power supply into a high frequency voltage and supplying it to the discharge lamp by the switching device and the resonance load circuit while keeping the preheating voltage constant during preheating; and the output voltage of the discharge lamp electrode of the inverter circuit during preheating. It is equipped with a control means for increasing the effective value of the fundamental wave component higher than the effective value of the fundamental wave component of the output voltage when the discharge lamp is lit. By making the effective value of the fundamental wave component of the output voltage during preheating higher than the effective value of the fundamental wave component of the output voltage during lighting of the discharge lamp Ensure sufficient preheating current becomes possible.

An illumination device according to claim 6 comprises the discharge lamp lighting device according to any one of claims 1 to 5; and a fixture main body to which a discharge lamp to be lit by the discharge lamp lighting device is mounted. And, each effect is played.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a lighting device of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view showing the external appearance of the illuminating device. As shown in FIG. 2, the illuminating device 1 is a ceiling-embedded lower surface open instrument having an elongated instrument main body 2. Reference numeral 2 is a thin box type having an irradiation opening 3 on the lower surface, a reflecting surface 4 is formed inside the instrument body 2, a socket 5 is provided on one end side of the reflecting surface 4, and a lamp holding member 6 is attached to the other end. Has been. FIG. 3 is a plan view showing a cutaway lamp holding member in which the lamp holding member is attached to the fluorescent lamp.
Is a vertical sectional view of a fluorescent lamp with a lamp holding member attached,
As shown in FIGS. 3 and 4, two straight tubes 7, 7 as discharge lamps are arranged in parallel in a socket 5, and a discharge path is folded back at one connecting portion 8 of these straight tubes 7, 7. The cap 9 of the compact fluorescent lamp FL, which is communicated as described above, is attached, and the vicinity of the connection part 8 which is the coldest part on the side opposite to the cap is held by the lamp holding member 6 which holds the fluorescent lamp FL together with the socket 5. It In addition, Fig. 1 of the fluorescent lamp FL
The filaments FLa and FLb, which are the electrodes shown in, are at room temperature,
That is, filament FL when left at room temperature for a long time
The resistance values of a and FLb are Rc, and the resistance values of the filaments FLa and FLb when a preheating current 1.3 to 1.8 times the rated lamp current is applied for 1 second are Rh and Rh / Rc ≧ 4. The temperature becomes 850 ° C or higher.

The lamp holding member 6 has a cap-shaped main body having two cylindrical recesses 10 and 10 each capable of accommodating the straight tubes 7 each having a diameter slightly larger than the diameter of the two straight tubes 7 and 7.
Have 11. The depth of the recesses 10, 10 is slightly shorter than the length of the tip of the connecting portion 8 of the straight pipe 7, and the connecting portion 8 of the main body 11 is formed.
The contact of the straight pipe 7 with the straight pipe 7 limits the amount of insertion of the straight pipe 7 into the recess 10.

Further, the fluorescent lamp FL has a discharge path length of 120.
0 mm or more, for example 2400 mm, with an inner diameter of 20 mm
Below, for example, 15.5 mm or 16 mm.
And, the power per unit length at the rated lighting is 0.35
The rated lamp current is about 165 mA at W / cm or less.
The discharge path length is 2400 mm ± 20%, and the inner diameter is 15.
It may be 5 mm ± 20%. Further, in order to improve the efficiency of the fluorescent lamp FL, there are a long path, a low current, and a thin tube. Then, in the case of such a fluorescent lamp FL having a long discharge path length of 1200 mm or more, under the constant lamp power, as shown in FIG. The rate of loss due to the voltage drop is reduced, and the lamp efficiency is further improved. If the lamp length is too long, that is, if the current is reduced, the lamp temperature will drop significantly, making it difficult to obtain the optimum operating temperature, resulting in a drop in efficiency. Becomes smaller, the lamp temperature rises, but
Does not rise to optimum operating temperature.

Therefore, by housing the fluorescent lamp FL in the instrument body 2, the instrument body 2 has a heat retaining function by self-heating of the fluorescent lamp FL, and the vicinity of the connection portion 8 which is the coldest portion of the fluorescent lamp FL. By accommodating and holding the lamp in the lamp holding member 8, the temperature of the coldest portion rises and the lamp efficiency rises. Considering the fluorescent lamp FL as a heating element, if the same lamp power is used and the inner diameter is 15.5 mm, the discharge path length is 600 mm.
The temperature rise of the coldest part of the fluorescent lamp FL is larger in the compact type having two m.

Here, the experimental results on the temperature rise of the fluorescent lamp FL will be described.

When the discharge path lengths of the compact type and the straight tube type fluorescent lamps FL are the same, the compact type and the straight tube type are respectively housed in the instrument body 2, and the instrument body 2 is placed at infinity. FIG. 6 shows the experimental results for the case of nakedness and the case of nakedness. According to this experiment, when the lamp current is changed and the electric power per unit length is changed, the coldness of the fluorescent lamp FL in the case of the bare straight tube type Sn is lower than that of the bare compact type Cn. Although the temperature rise of the part is large, the temperature rise of the compact type Ci housed in the instrument body 2 is larger than that of the straight pipe type Si housed in the instrument body 2. Therefore, by housing the compact fluorescent lamp FL in the instrument body 2, the temperature of the coldest part of the fluorescent lamp FL can be effectively increased, and the device can be further downsized.

The discharge path length is 2400 mm and the inner diameter is 1
Rated lamp current 165mA for 5.5mm fluorescent lamp FL
In the naked state, the temperature is increased to 13.3 ° C. by being stored in the device main body 2 at about 40 ° C., so that the lamp temperature at which the efficiency shown in FIG. 7 is the best is around 55 ° C. Therefore, by housing the compact fluorescent lamp FL in the instrument body 2, the efficiency of the lamp can be maximized.

The fluorescent lamp FL is not limited to one in which two straight tubes are arranged in parallel and connected at one connecting portion, and one straight tube bent at the center to have a U-shape is also the same. The effect of can be obtained.

A discharge lamp lighting device for preheating, starting and lighting the fluorescent lamp FL shown in FIG.
21 are stored.

FIG. 1 is a circuit diagram showing a discharge lamp lighting device. In this discharge lamp lighting device 21, as shown in FIG. 1, a filter circuit 22 for removing noise is connected to a commercial AC power source e. An input terminal of a full-wave rectifier circuit 23 is connected to 22 and an output terminal of the full-wave rectifier circuit 23 is connected to a boost chopper circuit 24 that also functions as an active filter. In this step-up chopper circuit 24, a series circuit of an inductor L1 and a field effect transistor Q1 as a switching element is connected to the output terminal of a full-wave rectifier circuit 23. The field effect transistor Q1 includes a diode D1 and a smoothing capacitor C1. A series circuit is connected. The boost chopper circuit 24 has an effective voltage of the commercial AC power source e of 10
When the output voltage is 0V, the output voltage is preferably 160V to 240V, and when the effective voltage of the commercial AC power supply e is 200V, the output voltage is preferably 320V to 470V.

A half-bridge type inverter circuit 25 is connected to the step-up chopper circuit 24. The inverter circuit 25 has a field effect transistor Q2 and a field effect transistor Q3 as a switching device connected in parallel to the capacitor C1. They are connected in pairs. further,
A resonant load circuit 26 is connected to the field effect transistor Q3. This resonant load circuit 26 is a field effect transistor.
DC cut capacitor C2 and ballast choke L2 in Q3
And a series circuit of the primary winding Tr1a of the transformer Tr1 for boosting is connected, and the secondary winding Tr1b of this transformer Tr1 is connected to one end of each of the filaments FLa, FLb of the fluorescent lamp FL. A starting capacitor C3 for preheating the capacitor is connected to the other end of the.
Further, the resonance load circuit 26 has an impedance deviation angle of 20 ° or less as viewed from the inverter circuit 25 side at the time of rated operation, which reduces loss and improves efficiency.

In this discharge lamp lighting device 21, the full-wave rectification circuit 23 full-wave rectifies the AC voltage of the commercial AC power source e, and the step-up chopper circuit 24 reduces harmonics by switching-controlling the field effect transistor Q1. Then, the voltage is raised and the field effect transistors Q2 and Q3 are alternately turned on and off at a high frequency to be converted into a high frequency alternating current by the inverter circuit 25, and the fluorescent lamp FL is lit at a high frequency.

By constructing the basic configuration of the discharge lamp lighting device 21 with the booster chopper circuit 24 and the inverter circuit 25 having the resonant load circuit 26, it is possible to achieve high efficiency with a simple configuration.

By setting the range of the DC voltage of the step-up chopper circuit 24, the efficiency of the step-up chopper circuit 24 having a relatively large loss can be improved, and the resonance load circuit 26 of the inverter circuit 25 can be boosted. Transformer Tr for
By connecting 1, the efficiency of the inverter circuit 25 can be improved.

Here, a specific example of this structure will be described.

First, the fluorescent lamp FL has a discharge path length of 2400.
mm, inner diameter 15.5 mm, rated lamp power WL is 57 W
Use the one. In this case, the lamp voltage is 340V,
The power per unit length is 0.238 W / cm.

Further, the step-up chopper circuit 24 inputs an effective value of 100 V of the voltage of the commercial AC power source e, and outputs a DC voltage of 160 V.
Outputs V to 240V. A boost chopper circuit
With 24, the lower the set value of the DC voltage, the higher the circuit efficiency.
Further, the DC voltage of the step-up chopper circuit 24 is a peak value when the fluctuation of the power supply is taken into consideration when the effective value of the commercial AC power supply e is 100 V or 200 V and the minimum value is ± 10%. Yes, the upper limit is 20% of the loss of the boost chopper circuit 24 when the output voltage is set to the lower limit.
Determined by increasing value.

Further, the inverter circuit 25 has a frequency fs
The square wave voltage of is output. It becomes the effective value of the fundamental wave component when the Fourier series expansion is performed.

When setting the constant of the resonance load circuit 26, the rectangular wave voltage output from the inverter circuit 25 is Fourier series expanded, and the effective value of the fundamental wave component is Va.
c, the rated lamp voltage WL, the equivalent resistance RL of the fluorescent lamp FL, and the deflection angle arg (Z) of the resonant load circuit 26 as seen from the output of the inverter circuit 25, the ballast choke L2 and the ballast choke L2 of the winding component, which is the basic configuration, The value of capacitor C3 is determined.

When the preheating voltage Vph of the fluorescent lamp FL is constant, the filament current during lighting is If1, and the filament current during preheating of the fluorescent lamp FL before starting is If2, with respect to the effective value Vac. The inductance of the ballast choke L2 and the capacitance of the capacitor C3 are calculated, and the constants are used to calculate the filament current If during lighting.
1. The filament current If2 at the time of preheating of the fluorescent lamp FL before starting is calculated and plotted with respect to the rated lamp current as shown in FIG. It should be noted that V250 in FIG. 8 indicates that the effective voltage of the fundamental wave component of the output voltage of the inverter circuit 25 is 250.
V and V200 mean 200V and V100 means 100V.

When the fluorescent lamp FL is rated, it is I
By setting f1 / IL ≦ 1, the electric power of the filaments FLa and FLb can be reduced. Further, if the filament current If2 is increased during preheating of the fluorescent lamp FL, preheating is easy. Specifically, If2 / IL ≧ 1.3 is desirable. Furthermore, If1 / IL ≦ 1
This can be done when the effective value Vac of the fundamental wave component of the output voltage of the inverter circuit 25 is Vac ≧ 250V.

Therefore, when Vac ≧ 250 V, If1 / IL ≦ 1, and If2 / IL ≧ 1.3, the heating conditions of the filaments FLa and FLb can be optimized. In this way, by optimizing the heating conditions of the filaments FLa, FLb, for example, the luminous flux of this fluorescent lamp FL after the lighting time of 12000 hours can be maintained at 70% or more.

Next, a discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 9 is a circuit diagram showing a discharge lamp lighting device. The discharge lamp lighting device 21 shown in FIG. 9 is the same as the discharge lamp lighting device 21 shown in FIG.
Instead of the primary winding Tr1a side, it is connected to the secondary winding Tr1b side.

The basic operation and action are similar to those of the discharge lamp lighting device 21 shown in FIG.

Here, as shown in FIG. 1, the ballast choke L2 is connected to the primary winding Tr1a side of the primary winding Tr1a of the transformer Tr1 and is connected to the secondary winding Tr1b side as shown in FIG. The thing will be described with reference to FIG.

FIG. 10 shows the sum of the capacitance VA of the ballast choke L2 and the transformer Tr1 with the argument of the impedance of the resonance load circuit 26 as a parameter. The ballast choke L2 is connected to the primary winding Tr1a side of the transformer Tr1. Since the solid line 1 that has been formed can have a smaller capacity than the solid line 2 connected to the secondary winding Tr1b side of the transformer Tr1, the ballast choke
It is preferable to connect L2 to the primary winding Tr1a side of the transformer Tr1.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 11 is a circuit diagram showing another discharge lamp lighting device. The discharge lamp lighting device 21 shown in FIG. 11 has a simple structure without the transformer Tr1 in the discharge lamp lighting device 21 shown in FIG. It is the one.

The basic operation and action are similar to those of the discharge lamp lighting device 21 shown in FIG.

Here, a specific example of this structure will be described.

First, the fluorescent lamp FL has a discharge path length of 2400.
mm, inner diameter 15.5 mm, rated lamp power WL 56W
Use the one. In this case, the lamp voltage is 342 V at an ambient temperature of 25 ° C.

Further, as shown in FIG. 13, the output voltage of the inverter circuit 25 is changed so that a desired lamp power can be obtained, and if 1 / IL ≦ 1 can be achieved by the DC power supply 31.
Is a DC voltage 555V. In addition, the effective voltage of the DC power supply 31 is 222V for V222 of FIG. 13, and the effective voltage of V444 is 44V.
4V and V555 mean 555V. DC voltage 5
55V corresponds to the effective value 250V of the fundamental wave component of the output rectangular wave voltage of the inverter circuit 25.

When setting the constant of the inverter circuit 25, the voltage Vdc of the DC power supply 31, the rated lamp voltage WL, the equivalent resistance RL of the fluorescent lamp FL, and the bias of the resonant load circuit 26 seen from the output of the inverter circuit 25 are set. Corner arg
(Z) determines the values of the ballast choke L2 and the capacitor C3 of the winding component, which is the basic configuration.

Further, it is allowed to stand at room temperature for 25 hours at room temperature.
The filament FLa, FLb at a temperature of ℃ has a resistance value Rc, and the filament current If2 is 1.3 to 1.8 times the lamp current IL at the time of lighting and the filament current If2 at the time of preheating is passed for 1 second.
If the resistance values of a and FLb are Rh and Rh / Rc ≧ 4 is satisfied,
Since the average temperature of the filaments FLa and FLb is 850 ° C., it can be preheated appropriately.

Therefore, when Vdc ≧ 555 V, If1 / IL ≦ 1, 1.3 ≦ If2 / IL ≦ 1.8, the heating conditions of the filaments FLa and FLb can be optimized.

Next, a discharge lamp lighting device according to another embodiment will be described with reference to FIG.

FIG. 14 is a circuit diagram showing a discharge lamp lighting device.
The discharge lamp lighting device 21 shown in FIG. 14 is the same as the discharge lamp lighting device 21 shown in FIG. 12, except that the ballast choke L2 is connected to the secondary winding Tr1b side instead of the primary winding Tr1a side of the transformer Tr1. is there.

The basic operation and action are similar to those of the discharge lamp lighting device 21 shown in FIG.

A discharge lamp lighting device according to another embodiment will be described with reference to FIG.

The discharge lamp lighting device 21 shown in FIG. 15 is the same as the discharge lamp lighting device 21 shown in FIG. 12, except that the commercial AC power source e, the filter circuit 22, the full-wave rectifier circuit 23 and the step-up chopper circuit 24 are replaced with a simple DC power source 31. The capacitor C5 for DC cut is connected to the resonance load circuit 26 connected to the field effect transistor Q3.

The basic operation and action are similar to those of the discharge lamp lighting device 21 shown in FIG.

Further, another embodiment will be described with reference to FIG.

In this other embodiment, the frequency of the inverter circuit 25 is controlled so that the preheating voltage of the filaments FLa and FLb of the fluorescent lamp FL is constant, and the voltage of the DC power supply 31 at the time of preheating is set to the fluorescent lamp FL. The voltage is higher than the rated lighting voltage and is controlled by a control means (not shown).

As described above, by raising the voltage of the DC power supply 31 during preheating to be higher than that during rated lighting, the preheating current of the filaments FLa and FLb of the fluorescent lamp FL can be increased and proper preheating can be performed.

Here, the reason why the preheating current can be increased will be described.

First, assuming that the effective value of the fundamental wave component of the output voltage of the inverter circuit 25 is Vac and the frequency of the fundamental wave component is f, the angular frequency ω = 2πf.

Further, since the fluorescent lamp FL is preheated, the equivalent resistance value becomes infinite, the inductance of the ballast choke L2 is L2, the capacitance of the capacitor C3 is C3, and the capacitance of the capacitor C5 ignores the impedance near the operating frequency. If it is as large as possible, the impedance Z (ω) of the resonant load circuit 26 viewed from the inverter circuit 25 side during preheating becomes Z (ω) = jωL2 + (1 / jωC3), and the voltage generated across the fluorescent lamp FL, That is, the preheating voltage Vph (ω) is The frequency f1 at which the predetermined preheat voltage Vph1 is obtained is f1 = (1 / 2π) ((1 / L2C3) (1 + Vac / Vph
1)) ^1/2 , and it can be seen from this equation that the frequency f1 can be increased by increasing Vac.

On the other hand, the filament current If2 (f1) during preheating at this frequency becomes If2 (f1) = 2πf1C3Vph1, and the preheating current can be increased by increasing Vac. That is, the effective value Vac of the inverter circuit 25 may be increased by increasing the voltage Vdc of the DC power supply 31.

Also in the circuit configurations shown in FIGS. 1, 9, 11, 12, and 14, the same effect can be obtained by increasing the voltage during preheating. In the case of the configuration including the boost chopper circuit 24, the boost chopper circuit 24
The output voltage of 24 may be Vdc.

A discharge lamp lighting device 21 according to another embodiment is also provided.
Will be described with reference to FIG.

FIG. 16 is a circuit diagram showing a discharge lamp lighting device according to another embodiment. A discharge lamp lighting device 21 shown in FIG.
Is connected to a commercial alternating-current power supply e with a filter circuit 41. The filter circuit 41 is connected with a full-wave rectifier circuit 42 including diodes D11 to D14.
Connect capacitor C11 to the output side of 42
A pumping type smoothing circuit 43 is connected to 11. This smoothing circuit
43 is parallel to the capacitor C11, the capacitor C12,
A series circuit of the inductor L11 and the diode D15 is connected, and the diode D16 is connected to the connection point of the inductor L11 and the diode D15.

Further, a monolithic inverter circuit 44 is connected to the smoothing circuit 43. This inverter circuit 44
In the inverter transformer Tr11, a primary winding Tr11a, an inductor L12, and a field effect transistor Q11 that is a switching device are connected in series, and a resonance capacitor C13 is connected in parallel to the field effect transistor Q11.

Further, two fluorescent lamps FL are connected in series to the secondary winding Tr11b of the inverter transformer Tr11, and the filaments at both ends of the fluorescent lamps FL are connected in series.
A capacitor C14 for starting the capacitor preheating method is connected between the other ends of FLa and FLb.

Then, the AC voltage of the commercial AC power supply e is rectified by the full-wave rectification circuit 42, and the capacitor C11 and the smoothing circuit 43 are rectified.
The inverter circuit 44 outputs a high-frequency AC voltage by the resonance of the inductor L12 and the capacitor C13, and turns on the two fluorescent lamps FL.

Also in this case, the pre-heating of the filaments FLa and FLb of the fluorescent lamp FL is appropriately performed by increasing the voltage of the commercial AC power source e at the time of pre-heating to increase the effective voltage value of the inverter circuit 44.

Although the half bridge type or the one-stone type inverter circuit is used in the above embodiment, a high frequency is superimposed on the basic waveform by using a rectifying circuit and two capacitors having different capacities. And a single-voltage resonance type inverter circuit with improved power factor, or a series circuit of two switching elements and a series circuit of two capacitors having different capacities connected in parallel to the series circuit of the switching elements, Similar effects can be obtained by using an inverter circuit that improves the power factor output between the connection point of the switching element and the connection point of the capacitor.

[0069]

According to the discharge lamp lighting device of the first aspect, the discharge path length is 1200 mm or more and the inner diameter is 20 mm or less.
A discharge lamp whose power per unit length during lighting is 0.35 W / cm or less is efficient, and the operating frequency during lighting is constant, and when the effective value of the fundamental wave component of the output is Vac, When Vac ≧ 250V, the lamp current during lighting is IL,
When the filament current during lighting is If1, and the filament current during preheating before starting the discharge lamp is If2, If1 /
By setting IL ≦ 1 and If2 / IL ≧ 1.3, it is possible to optimize the heating of the filament during the preheating and lighting of the discharge lamp.

According to the discharge lamp lighting device of the second aspect,
The resistance value of the electrode at room temperature is Rc, the resistance value of the electrode when a preheating current 1.3 to 1.8 times the lamp current at the time of lighting is Rh, and the electrode of Rh / Rc ≧ 4 is The filament current during preheating before starting the discharge lamp is set to 1.3 to 1.8 times the lamp current of the discharge lamp, and the filament current during lighting of the discharge lamp is set to 1.0 times or less of the lamp current. As a result, heating of the filament of the discharge lamp can be optimized both during preheating before starting the discharge lamp and during lighting of the discharge lamp.

According to the discharge lamp lighting device of the third aspect,
Before starting the discharge lamp, the electrode whose resistance at room temperature is Rc and whose temperature is 850 ° C or higher when a preheating current of 1.3 to 1.8 times the lamp current during lighting is applied The filament current at the time of preheating is set to 1.3 to 1.8 times the lamp current of the discharge lamp, and the filament current at the time of lighting the discharge lamp is set to 1.0 times or less of the lamp current. The heating of the filament of the discharge lamp can be optimized both at the time of preheating before starting and when the discharge lamp is lit.

According to the discharge lamp lighting device of the fourth aspect,
Even with a constant preheating voltage, a sufficient preheating current can be secured by making the output voltage of the electrodes of the discharge lamp of the DC power source during preheating higher than the output voltage during lighting of the discharge lamp.

According to the discharge lamp lighting device of the fifth aspect,
Even if the preheating voltage is constant, by making the effective value of the fundamental wave component of the output voltage during preheating of the electrodes of the discharge lamp of the inverter circuit higher than the effective value of the fundamental wave component of the output voltage during lighting of the discharge lamp, Sufficient preheating current can be secured.

According to the sixth aspect of the present invention, there is provided the apparatus main body to which the discharge lamp lit by the discharge lamp lighting device according to any one of the first to fifth aspects is attached.
Each effect can be exhibited.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a discharge lamp lighting device of the present invention.

FIG. 2 is a perspective view showing the outer appearance of the above lighting device.

FIG. 3 is a plan view showing a notch of a lamp holding member in which the lamp holding member is attached to the same fluorescent lamp.

FIG. 4 is a vertical cross-sectional view in which a lamp holding member is attached to the same fluorescent lamp.

FIG. 5 is a graph showing the relationship between the discharge furnace length and the lamp efficiency under the same lamp power of the fluorescent lamp.

FIG. 6 is a graph showing the relationship between the power per unit length and the temperature rise under the constant lamp power of the fluorescent lamp.

FIG. 7 is a graph showing the relationship between the temperature of the coldest part and the efficiency of the same fluorescent lamp.

FIG. 8 is a graph showing a relationship between a filament current If1 during lighting and a filament current If2 during preheating before starting of the fluorescent lamp FL.

FIG. 9 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the above.

FIG. 10 is a graph showing the relationship between the deflection angle and the capacitances of the transformer and the choke coil.

FIG. 11 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the present invention.

FIG. 12 is a circuit diagram showing a discharge lamp lighting device of still another embodiment of the same.

FIG. 13 is a graph showing a relationship between a filament current If1 during lighting and a filament current If2 during preheating before starting of the fluorescent lamp FL.

FIG. 14 is a circuit diagram showing a discharge lamp lighting device according to another embodiment of the above.

FIG. 15 is a circuit diagram showing a discharge lamp lighting device of still another embodiment of the same.

FIG. 16 is a circuit diagram showing a discharge lamp lighting device according to still another embodiment of the above.

[Explanation of symbols]

1 Lighting device 2 Fixture body 21 Discharge lamp lighting device 25 Inverter circuit 26 Resonance load circuit 31 DC power supply FL Fluorescent lamp as discharge lamp Q2, Q3, Q11 Field effect transistor as switching device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Moriyama             4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo Toshiba             Inside Litec Co., Ltd. (72) Inventor Keiichi Shimizu             4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo Toshiba             Inside Litec Co., Ltd. (72) Inventor Takeo Yasuda             4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo Toshiba             Inside Litec Co., Ltd. F-term (reference) 3K072 AA02 AB03 AC02 AC11 BB10                       BC01 CA16 CB02 DA02 DB03                       DB09 DC07 DC08 DD04 DE06                       GA02 GB04 GB12 GC04

Claims (6)

[Claims] 1. A switching device; a discharge path length of 120
A resonance load circuit of an inductor and a capacitor, to which a discharge lamp having a filament of 0 mm or more, an inner diameter of 20 mm or less, and an electric power per unit length during lighting of 0.35 W / cm or less is connected; operating frequency during lighting operation Is constant, and V is the effective value of the fundamental wave component of the output, V
If ac ≧ 250 V, the lamp current during lighting is IL, the filament current during lighting is If1, and the filament current during preheating before starting the discharge lamp is If2, If1 / IL ≦
1. If2 / IL ≧ 1.3, the discharge lamp lighting device is characterized in that the switching device and the resonance load circuit convert the voltage of the DC power supply into a high frequency voltage and supply the high frequency voltage to the discharge lamp. 2. A switching device; the resistance value of the electrode at room temperature is Rc, and the resistance value of the electrode when a preheating current 1.3 to 1.8 times the lamp current during lighting is applied for 1 second is Rh. And a resonance load circuit of an inductor and a capacitor to which a discharge lamp having an electrode of Rh / Rc ≧ 4 is connected; the filament current during preheating before starting the discharge lamp is 1.3 times the lamp current of the discharge lamp. Or 1.8 times, the filament current at the time of lighting the discharge lamp is set to 1.0 times or less of the lamp current, and the switching device and the resonance load circuit convert the voltage of the DC power supply into a high frequency voltage to form a discharge lamp. Discharge lamp lighting device characterized by supplying. 3. A switching device; the resistance of the electrode at room temperature is Rc, and the temperature of the electrode is 850 ° C. when a preheating current of 1.3 to 1.8 times the lamp current during lighting is applied for 1 second. A resonance load circuit of an inductor and a capacitor to which a discharge lamp having the above electrodes is connected; a filament current during preheating before starting the discharge lamp is 1.3 to 1.8 times the lamp current of the discharge lamp The filament current when the discharge lamp is lit is 1.0 times or less of the lamp current, and the switching device and the resonance load circuit convert the voltage of the DC power supply into a high frequency voltage and supply it to the discharge lamp. Discharge lamp lighting device. 4. A direct-current power source having a variable output voltage; a resonance load circuit of an inductor and a capacitor to which a switching device and a discharge lamp having an electrode are connected, and switching is performed with a constant preheating voltage when the electrode of the discharge lamp is preheated. An inverter circuit for converting the voltage of the DC power supply into a high-frequency voltage and supplying it to the discharge lamp by the device and the resonant load circuit; the output voltage when the electrodes of the discharge lamp of the DC power supply are preheated, from the output voltage when the discharge lamp is lit A discharge lamp lighting device comprising: a control unit for raising the temperature. 5. A direct-current power source having a variable output voltage; a resonance load circuit of an inductor and a capacitor, to which a switching device and a discharge lamp having an electrode are connected, and a constant preheating voltage is used for switching when the electrode of the discharge lamp is preheated. An inverter circuit for converting a voltage of a DC power supply into a high frequency voltage and supplying it to a discharge lamp by a device and a resonant load circuit; and an effective value of a fundamental wave component of an output voltage at the time of preheating electrodes of a discharge lamp of the inverter circuit. Control means for increasing the effective value of the fundamental wave component of the output voltage during lighting of;
A discharge lamp lighting device comprising: 6. A lighting device comprising: the discharge lamp lighting device according to any one of claims 1 to 5; and a fixture main body to which a discharge lamp to be lit by the discharge lamp lighting device is mounted. .