JP2000123987A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device in a smaller size and at a lower cost, capable of lighting a tubing lamp having severe preheated conditions with a long service life, maintaining a sufficient preheating current in priority while controlling the voltage increase of a smoothing capacitor and easily detecting and controlling malfunction during removal of a lamp and disconnection of filaments. SOLUTION: A discharge lamp lighting device includes a rectifier DB for rectifying an AC power supply AC, a smoothing capacitor C0 for smoothing the output of the rectifier DB via a diode D1, an inverter using the smoothing capacitor C0 as a power supply, a discharge lamp FL having a pair preheating filaments, a first resonance circuit mounted on a supply passage for high frequency output from the inverter to the discharge lamp FL, a return power supply consisting of a portion of high frequency output the inverter and a second resonance circuit consisting of a series circuit of a preheating inductor Lf and a preheating capacitor Cf connected to both ends of the filaments not connected to the first resonance circuit for the discharge lamp FL.

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 for lighting a discharge lamp at a high frequency, and more particularly to a high-frequency charging system for suppressing input harmonic distortion, and a high-voltage and thin tube for high efficiency. And a discharge lamp lighting device for lighting a fluorescent lamp.

[0002]

2. Description of the Related Art Conventionally, input current distortion from a commercial power supply due to a capacitor input type device in which a rectified output of a commercial power supply is smoothed by a smoothing capacitor has become a serious problem. Has become a major issue. For this reason, there are methods to suppress input harmonic distortion by inserting a large inductor in the input part of the smoothing circuit or adding a chopper circuit to the input stage, but these methods reduce the size and cost of the equipment. Invite.

Therefore, in recent years, an inverter device using a high-frequency charging system as shown in FIG. 7 has been proposed. This circuit includes a smoothing capacitor C0 connected from a rectifier DB via a diode D1, an inverter INV that converts a DC voltage of the capacitor C0 to a high frequency and supplies a high frequency power to a load (fluorescent lamp FL), and an inverter INV. INV
Connected as an impedance element between the high-frequency vibration source (point A) and the output of the rectifier DB
and a filter circuit F for preventing high-frequency power from being fed back to the commercial AC power supply AC. Inverter IN
V is a switching element Q1, Q2 composed of a MOSFET including a body diode (a reverse diode parasitic between the drain and the source), an inductor L1, a capacitor C1, a coupling capacitor Cc, a discharge lamp FL, and a control element constituting a resonance circuit. The switching elements Q1 and Q2 are alternately turned on and off at high speed to light the discharge lamp FL at high frequency. The capacitor C1 forms a path for supplying a preheating current to the filament of the discharge lamp FL, and also serves as a capacitor for resonance with the inductor L1.

In this circuit, the inductor L1 and the discharge lamp FL
Is connected to the output of the rectifier DB via the capacitor Cin. The input current is drawn by the high-frequency voltage amplitude at the connection point (point A) between the inductor L1 and the discharge lamp FL, and the charging of the capacitor C0 is performed. Done. Assuming that the potential at the connection point (point A) between the inductor L1 and the discharge lamp FL is VA, when the potential VA at the point A decreases, the AC power supplies AC and A
The voltage of the difference between the potentials VA at the points is applied to the capacitor Cin, and the electric charge is accumulated in the capacitor Cin. When the potential VA at the point A rises, the electric charge accumulated in the capacitor Cin is charged to the capacitor C0 through the diode D1. Since this operation is performed in all sections in one cycle of the AC power supply AC, input distortion is improved. As described above, the high-frequency charging method can suppress input harmonic distortion with a small number of components.

[0005]

[Table 1]

[0006] Table 1 shows the rated lamp power, lamp voltage, and lamp power of various conventional fluorescent lamps (for example, a straight tube fluorescent lamp).
Although the lamp tube diameter is shown, the lamp voltage during lighting was about 138 V at most. In general, a discharge lamp (fluorescent lamp) having a low lamp voltage also has a low starting voltage.
Even at a peak value of about 141 V of the commercial AC power supply voltage of 0 V, it was possible to design a resonance circuit for preheating, starting, and lighting a conventional discharge lamp. Therefore, when the discharge lamp is turned on, the voltage Vdc of the capacitor C0 is set to a voltage as low as possible (about 150 to 180 V for 100 V AC input) while suppressing the input harmonic distortion.
Of the components of the inverter INV such as the switching element and the switching element.

On the other hand, in recent years, from the viewpoint of resource saving and energy saving, the tube diameter is as thin as about 18 to 29 mm and the optical path length is 140 mm.
High power discharge lamps as long as 0 to 2500 mm have been developed. For example, as shown in FIGS. 8 (a) and 8 (b), a plurality of annular arc tubes 1 having an electrode 2 at one end and a closed portion 3 at the other end are concentrically arranged. The vicinity of the closed portion 3 of the arc tube 1 is joined by a bridge joint portion 4 to form a single discharge path inside, and the coldest spot A is formed in the closed portion 3 and the annular arc tube is formed. There is a ring-shaped fluorescent lamp comprising a base 5 surrounding both ends of the fluorescent lamp 1.

[0008]

[Table 2]

This type of discharge lamp is formed into a narrow tube in order to increase the lamp efficiency. For example, as shown in Table 2, a lamp having a rated output of 97 W or 68 W has a relatively large lamp current as compared with a conventional lamp. Small, high lamp voltage. In order to start such a lamp reliably and to light it stably, there is a method of boosting the lamp applied voltage using a boosting transformer in the load unit.However, the resonance current of the inverter unit increases according to the boosting ratio, There is a problem that the loss of the switching element and the like increases.

Therefore, by increasing the power supply voltage of the inverter section to about 250 V to 300 V in accordance with the lamp voltage, such a lamp can be reliably started and lit stably while suppressing the resonance current.

However, the input power to the inverter INV decreases when the load is light, such as when preheating and starting the discharge lamp load. However, as long as the potential VA at the point A in FIG. The charged charge continues to be charged in the capacitor C0, and as a result, the voltage Vd of the capacitor C0
c rises. In particular, in this type of high-voltage lamp lighting device, since the circuit constant is set so as to boost the power supply voltage of the inverter unit according to the lamp voltage for the above-described reason, the voltage Vdc of the capacitor C0 increases at a light load. Capacitor C0 according to the voltage at light load.
And the components of the inverter INV such as the switching elements Q1 and Q2 need to have a high withstand voltage.
There is a problem of increasing costs.

Further, since the lamp diameter of this type of high efficiency lamp is smaller than that of a conventional lamp, the space for installing the filament is small, so that the filament is downsized. Is required to be controlled with high accuracy, and the preheating current at the time of preceding preheating is relatively larger than at the time of lighting. In other words, in the circuit system for preheating the filament by the current flowing through the capacitor C1 as shown in FIG. 7, it is necessary to increase the resonance current in order to relatively increase the preheating current at the time of preheating, and the voltage at the point A The amplitude increases, and the voltage Vdc of the capacitor C0 at the time of preceding preheating increases.

To solve this problem, there is a circuit as shown in FIG. In this conventional example, in a high frequency charging type inverter device as shown in FIG. 7, a capacitor Cf and a preheating transformer Tf are connected in series to a rectangular wave output of the inverter, and a secondary winding of the preheating transformer Tf is connected to a filament F1 of a discharge lamp FL. F2 to connect the filament to the voltage Vf
And a preheating inverter for supplying a preheating current by applying a voltage. Here, the resonance frequency fo2 of the preheating inverter is set higher than the resonance frequency fo1 of the main inverter for lighting the discharge lamp as shown in FIG. 10, and the starting and lighting are performed at the frequency fp near fo2 during the preheating. Time is fo1
The switching element is driven at a frequency fi in the vicinity of. At the frequency fp at the time of the pre-heating, the output of the pre-heating inverter is large, so that the pre-heating can be sufficiently performed. On the other hand, since the output of the main inverter is small, the voltage applied to the point A is reduced at the same time as the lamp applied voltage is reduced. Therefore, an increase in the voltage Vdc of the capacitor C0 can be suppressed. At the time of starting, the driving frequency of the switching element is set to fi and the output of the main inverter is increased to apply a high starting voltage to the lamp to start and turn on the lamp.

As described above, according to the conventional example, by providing two inverters and controlling the driving frequency of the switching element, it is possible to select which inverter is mainly supplied with electric power, and to select one of the inverters according to the voltage applied to the lamp. Thus, power is drawn and fed back to suppress input harmonic distortion, so that the rise of the voltage Vdc of the capacitor C0 during the preheating can be suppressed.

[0015]

However, in the method of providing a preheating inverter as shown in FIG. 9, a preheating transformer Tf is required, and a common inductor and switching element are used to improve input harmonic distortion. In such a system in which cost has been reduced, an increase in the number of transformers hinders further cost reduction and size reduction of the entire device.

Further, in the high-frequency charging system as shown in FIGS. 7 and 9, when the lamp is removed or the filament is broken, the same operation as during normal lighting is performed.
0 causes the voltage Vdc to rise. Therefore, a change in lamp voltage, lamp current, or the like is detected, and the capacitor C0 is detected.
Needs to be controlled so that the voltage Vdc does not increase.
However, in the method of providing the preheating inverter as shown in FIG. 9, the resonance circuit of the main inverter does not change, so that it is difficult to reliably detect abnormality.

[0017]

According to the present invention, in order to solve the above-mentioned problems, as shown in FIG.
A rectifier DB for rectifying C, a smoothing capacitor C0 for smoothing the output of the rectifier DB via a diode D1,
An inverter powered by the smoothing capacitor C0; a discharge lamp FL having a pair of preheating filaments; a first resonance circuit interposed in a high-frequency output supply path from the inverter to the discharge lamp FL; A feedback power supply comprising a part thereof and a second resonance circuit comprising a series circuit of a preheating inductor Lf and a preheating capacitor Cf connected to both ends of a filament not connected to the first resonance circuit of the discharge lamp FL. It is characterized by the following.

[0018]

(Embodiment 1) FIG. 1 shows a circuit configuration diagram of a first embodiment of the present invention. In this embodiment, the capacitor C1 of the circuit of the conventional example 1 shown in FIG. 7 is connected to the power supply side of the lamp, and a series circuit of a preheating resonance inductor Lf and a preheating resonance capacitor Cf is connected to the non-power supply side of the lamp. is there. Hereinafter, the circuit configuration of the present embodiment will be described in detail. The AC input terminal of the rectifier DB composed of a diode bridge is connected to a commercial AC power supply AC via a high-frequency cut filter circuit. The positive terminal of the DC output terminal of the rectifier DB is connected to the positive terminal of the capacitor C0 via the anode and the cathode of the diode D1. The negative side of the DC output terminal of the rectifier DB is grounded and connected to the negative terminal of the capacitor C0. A series circuit of switching elements Q1 and Q2 formed of MOSFETs is connected to both ends of the capacitor C0. A series circuit of a coupling capacitor Cc, an inductor L1, and a capacitor C1 is connected to both ends of the switching element Q2. Power supply terminals of both filaments of the discharge lamp FL are connected to both ends of the capacitor C1. A series circuit of a preheating resonance inductor Lf and a preheating resonance capacitor Cf is connected between the non-power supply terminals of both filaments of the discharge lamp FL. A capacitor Cin is connected as an impedance element between a connection point (point A) between the inductor L1 and the capacitor C1 and a positive output terminal of the rectifier DB (connection point with the anode of the diode D1).

Here, as shown in FIG. 2A, the series resonance frequency fo2 of the preheating resonance inductor Lf and the preheating resonance capacitor Cf is changed to the inductor L1 and the capacitor C1.
Is set sufficiently higher than the resonance frequency fo1. And
At the time of preheating, the frequency fp near the series resonance frequency fo2 of the preheating resonance inductor Lf and the preheating resonance capacitor Cf.
Drives the switching element. In this case, the voltage amplitude at the point A is small, and the rise of the voltage Vdc of the capacitor C0 is suppressed. Further, since the impedance of the series circuit of the preheating resonance inductor Lf and the preheating resonance capacitor Cf approaches zero, the resonance current is almost the same as the filament current If.
Becomes Next, at the time of starting and lighting, by driving at a frequency fi near the resonance frequency fo1 of the inductor L1 and the capacitor C1, power is supplied to the discharge lamp FL, and at the same time, the input harmonic distortion is suppressed by the amplitude of the point A. here,
By making the value of the preheating resonance capacitor Cf sufficiently smaller than that of the capacitor C1, the preheating resonance inductor L
The impedance of the series circuit of f and the preheating resonance capacitor Cf is increased to reduce the filament current If, thereby preventing the filament from breaking.

In a high-voltage lamp, as shown in FIG. 2B, as the lamp voltage rises due to dimming, the voltage Vdc of the capacitor C0 is increased from the full lighting voltage Vdcf to the dimming voltage Vdcd. However, by setting the preheating frequency fp to be equal to or higher than the frequency fp1 at which the voltage Vdc at the time of light load becomes the maximum value (Vdcd) at the time of light load, the capacitor C0, the switching elements Q1, Q2, etc. Of the components of the inverter INV can be reduced.

Further, when the lamp is removed or the filament is broken, the series circuit of the preheating resonance inductor Lf and the preheating resonance capacitor Cf connected in parallel to the capacitor C1 is disconnected, and the voltage across the capacitor C1 rises. Therefore, control for abnormality detection and output suppression can be easily performed.

In this embodiment, the preheating resonance inductor Lf
Treats only the filament current If, which flows a large current only for a short period of preheating and only a small current at the time of lighting, so that the inductor L1 can be smaller than that of the transformer Tf of FIG. 9, and the preheating resonance capacitor Cf is As described above, since the value is set to a sufficiently small value, there is an effect that downsizing and cost reduction can be achieved while satisfying the condition of lighting a high-voltage thin tube lamp for a long life.

(Embodiment 2) FIG. 3 shows a circuit configuration diagram of a second embodiment of the present invention. Hereinafter, the circuit configuration of the present embodiment will be described. The AC input terminal of the rectifier DB is connected to an AC power supply AC via a filter circuit. The positive side of the DC output terminal of the rectifier DB is connected to the positive terminal of the smoothing capacitor C0 via the anode and cathode of the diode D1. The negative side of the DC output terminal of the rectifier DB is grounded and connected to the negative terminal of the smoothing capacitor C0. A capacitor Cin is connected between both ends of the diode D1.
Are connected in parallel. A series circuit of switching elements Q1 and Q2 is connected to both ends of the smoothing capacitor C0. The switching elements Q1 and Q2 are composed of MOSFETs including body diodes (parasitic diodes in antiparallel), and are turned on and off alternately and complementarily. A main resonance inductor L1 and a coupling capacitor Cc are provided between the connection point of the switching elements Q1 and Q2 and the output terminal on the positive side of the rectifier DB (the anode side of the diode D1).
And a series circuit of a main resonance capacitor C1, and a load circuit Z1 including a discharge lamp FL is connected in parallel to the main resonance capacitor C1. It is connected to the power supply side terminals of both filaments F1 and F2 of the discharge lamp FL.
A series circuit of a preheating resonance inductor Lf and a preheating resonance capacitor Cf is connected between the non-power supply terminals of both filaments F1 and F2 of the discharge lamp FL.

In contrast to the first embodiment in which the input current is drawn over the entire cycle of the commercial AC power supply AC by the high-frequency voltage amplitude of the high-frequency vibration source (point A) in the inverter INV, the input harmonic distortion is improved. In the example, the input current is drawn over the entire period of the commercial AC power supply AC by the high frequency voltage amplitude generated in the capacitor Cin by the inverter current flowing through the capacitor Cin, and the input harmonic distortion is improved.

The operation of this embodiment will be described below.
In FIG. 3, when the switching element Q2 is turned on, the power supply voltage Vdb is lower than the sum of the voltage Vcin across the capacitor Cin and the voltage Vdc of the smoothing capacitor C0 (Vd
b <Vdc−Vcin), the smoothing capacitor C0
From the capacitor Cin, the capacitor C1 and the load circuit Z
1. A resonance current flows through the path of the coupling capacitor Cc, the inductor L1, the switching element Q2, and the smoothing capacitor C0. At this time, since the current flows while charging the capacitor Cin, when the voltage of the capacitor Cin rises and Vdb ≧ Vdc−VCin, the capacitor Cin
1, a resonance current flows from the power supply side via the load circuit Z1, the coupling capacitor Cc, the inductor L1, and the switching element Q2.

When the switching element Q1 is turned on, a resonance current flows from the coupling capacitor Cc while discharging the charge of the capacitor Cin through the path of the capacitor C1, the load circuit Z1, the capacitor Cin, and the switching element Q1. When the voltage Vcin of the capacitor Cin becomes zero, the diode D1 turns on, and a current flows through the diode D1 instead of the capacitor Cin. As described above, even if the power supply voltage is lower than the voltage of the smoothing capacitor C0, the current is drawn from the input and the input harmonic distortion can be improved.

In this embodiment, the series resonance frequency fo of the inductor Lf for preheating resonance and the capacitor Cf is the same as in the first embodiment.
2 is set sufficiently higher than the resonance frequency fo1 of the main resonance inductor L1 and the capacitor C1, so that during pre-heating, the switching elements Q1 and Q2 are driven with a high frequency having a small resonance current to secure the preheating current and By reducing the resonance current passing through C1, the input pull-in from the power supply is suppressed low, and the rise of the voltage Vdc of the smoothing capacitor C0 is suppressed. Further, at the time of lighting, the values of the inductor Lf and the capacitor Cf are set so as to increase the impedance of the series circuit of the inductor Lf for preheating resonance and the capacitor Cf, and the resonance current If for preheating is reduced to prevent disconnection. As described above, this embodiment also has the same effect as the first embodiment.

(Embodiment 3) FIG. 4 shows a circuit diagram of a third embodiment of the present invention. In the present embodiment, the load circuit Z1 connected to both ends of the resonance capacitor C1 in the second embodiment of FIG. 3 is replaced with a connection point between the capacitor Cin and the smoothing capacitor C0, and the capacitor Cin of the terminals of the resonance capacitor C1. And a terminal connected to the non-connected side. In this embodiment, since the load current does not directly flow through the capacitor Cin, the input current is drawn only by the reactive current flowing through the resonance capacitor C1. Therefore, even if the filament current increases during the preheating, the feedback current is not affected, and the voltage V of the smoothing capacitor C0 is not affected.
The increase in dc can be suppressed.

(Embodiment 4) FIG. 5 shows a circuit configuration diagram of a fourth embodiment of the present invention. This embodiment is different from the third embodiment shown in FIG. 4 in that the connection point between the capacitor Cin and the smoothing capacitor C0 and the capacitor Ci among the terminals of the resonance capacitor C1.
The load circuit Z1 connected between the n and the non-connected terminal is replaced with the negative output terminal (ground) of the rectifier DB and the terminal of the resonance capacitor C1 that is not connected to the capacitor Cin. Connected between these terminals. In terms of high frequency, it works completely equivalent to the third embodiment. In this embodiment, since one end of the discharge lamp FL is connected to the ground, the connection between the detection circuit for detecting a load abnormality or the like and the control circuit for the switching elements Q and Q2 is facilitated. The circuit can be simplified and the cost can be reduced.

(Embodiment 5) FIG. 6 shows a circuit configuration diagram of a fifth embodiment of the present invention. This embodiment has a configuration in which a chopper inductor L2 is connected instead of the parallel circuit of the capacitor Cin and the diode D1 in the second embodiment of FIG. The operation of the present embodiment will be described. When the switching element Q1 is on, the inductor L2 and the inductor L
1. A current flows through the inductor L2 due to the resonance current flowing through the capacitor C1, and when the switching element Q1 is turned off, the electromotive force generated by the current IL2 of the inductor L2 charges the smoothing capacitor C0 through the path of the power supply, the inductor L2, and the smoothing capacitor C0, and inputs. Improve distortion. In the present embodiment, a current for accumulating energy in the inductor L2 is not directly passed through a path including a power supply, an inductor L2, a switching element, and a power supply as in a normal chopper circuit, but is used as a load resonance current, so that resonance is weak. There is a feature that the rise of the voltage Vdc during the preliminary preheating is reduced. The load circuit Z1 connected in parallel to the capacitor C1 has the same settings as in the first embodiment,
A sufficient preheating current can be supplied to the filament while suppressing an increase in the voltage Vdc in a frequency region where the main resonance current is weak.

[0031]

According to the present invention, by making the resonance frequency of the filament resonance circuit sufficiently higher than the resonance frequency of the main resonance circuit, the amount of feedback to the power supply at the time of preheating is reduced, and the voltage rise of the smoothing capacitor is reduced. It is possible to reduce the stress on the smoothing capacitor, the switching element, and the like. In addition, since the pre-heating is performed near the resonance frequency of the filament resonance circuit, the impedance of the filament resonance circuit approaches zero, so that a sufficient pre-heating current can be secured. Further, at the time of lighting, by operating at a frequency at which the impedance of the filament resonance circuit becomes large and reducing the preheating current, a thin tube lamp with severe preheating conditions can be lit for a long life. In addition, when the lamp is removed or the filament is broken, the filament resonance circuit connected in parallel with the main resonance circuit is disconnected, so that abnormal conditions can be detected and detected.
Control becomes easy. In addition, the inductor of the filament resonance circuit flows a large current only for a short period of preheating,
At the time of lighting, only a small amount of current flows in the filament, so that downsizing and cost reduction are possible.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention.

FIG. 2 is a frequency characteristic diagram of a lamp voltage and a smoothed voltage according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram of a third embodiment of the present invention.

FIG. 5 is a circuit diagram according to a fourth embodiment of the present invention.

FIG. 6 is a circuit diagram of a fifth embodiment of the present invention.

FIG. 7 is a circuit diagram of Conventional Example 1.

FIG. 8 is a front view showing a configuration of a discharge lamp used in the present invention.

FIG. 9 is a circuit diagram of a second conventional example.

FIG. 10 is a frequency characteristic diagram of a lamp voltage of Conventional Example 2.

[Explanation of symbols]

 AC commercial power supply DB Rectifier FL Discharge lamp Q1 Switching element Q2 Switching element D1 Diode C0 Smoothing capacitor Cin capacitor Cc Coupling capacitor L1 Main resonance inductor C1 Main resonance capacitor Lf Preheating resonance inductor Cf Preheating resonance capacitor

Claims (9)

[Claims] 1. A rectifier for rectifying an AC power supply, a smoothing capacitor for smoothing an output of the rectifier via a diode, an inverter using the smoothing capacitor as a power supply, a discharge lamp having a pair of preheating filaments, and a discharge lamp from the inverter. A first resonance circuit interposed in the supply path of the high-frequency output to the electric lamp, a feedback power supply composed of a part of the high-frequency output of the inverter, and both ends of a filament not connected to the first resonance circuit of the discharge lamp A discharge lamp lighting device comprising: a second resonance circuit including a series circuit of a preheating inductor and a preheating capacitor. 2. A rectifier for rectifying an AC power supply, a smoothing capacitor for smoothing an output of the rectifier via an inductor, an inverter using the smoothing capacitor as a power supply, and a connection point between the rectifier and the inductor and an output of the inverter. A discharge lamp connected between the high-frequency output of the first resonance circuit and a first resonance circuit connected to the first resonance circuit; and both ends of a filament not connected to the first resonance circuit of the discharge lamp A discharge lamp lighting device, comprising: a second resonance circuit formed of a series circuit of a preheating inductor and a preheating capacitor connected to the discharge lamp. 3. The rated lamp voltage of the discharge lamp is 140.
V or more, and the AC power supply voltage is from AC90V to AC11.
The discharge lamp lighting device according to claim 1 or 2, wherein the discharge lamp lighting device is in a range of 0V. 4. The resonance frequency of the second resonance circuit is set higher than the resonance frequency of the first resonance circuit so that the smoothing capacitor voltage at the time of preceding preheating is lower than the maximum voltage of the smoothing capacitor at the time of lighting of the discharge lamp. The discharge lamp lighting device according to claim 1 or 2, wherein the inverter is operated near the resonance frequency of the second resonance circuit during the preheating. 5. The discharge lamp has a rated lamp voltage of about 9
7. A ring-type fluorescent lamp having a lamp power of 7 W, a rated lamp current of approximately 0.43 A, and a lamp voltage of approximately 229 V.
Or the discharge lamp lighting device according to claim 2. 6. The discharge lamp has a rated lamp voltage of about 6
2. A ring-type fluorescent lamp of 8 W, a rated lamp current of approximately 0.43 A, and a lamp voltage of approximately 160 V.
Or the discharge lamp lighting device according to claim 2. 7. The discharge lamp has an optical path length of about 1400 to about 1400.
The discharge lamp lighting device according to claim 1 or 2, wherein the tube diameter is 2500 mm and the tube diameter is approximately 18 to 29 mm. 8. The power supply according to claim 1, wherein the feedback power supply is an impedance element connected between a connection point between the rectifier and the diode and a connection point between the first resonance circuit and the discharge lamp. 2. The discharge lamp lighting device according to claim 1. 9. The discharge lamp lighting device according to claim 1, wherein the feedback power supply is an impedance element connected between both ends of the diode.