JPH10106784A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of common use for different kinds of discharge lamps at highest efficiency. SOLUTION: A discrimination correcting circuit 6 discriminates the kind of a discharge lamp La in a load circuit 5 by detecting lamp voltage. According to the discriminated result, when the discharge lamp is replaced to a different kind of discharge lamp La having different rated lamp voltage but the same rated lamp current, output voltage VDC of a step-up chopper circuit 3 is corrected so that the rated lamp current is supplied to the replaced discharge lamp La. The discrimination correcting circuit 6 apparently varies the detected voltage of the output voltage VDC, and a control circuit IC1 of the step-up chopper circuit 3 operates so as to make the output voltage VDC constant, as a result, the output voltage VDC varies to vary the output of an inverter circuit 4, and rated lamp current is supplied to the discharge lamp La.

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 In recent years, since a discharge lamp represented by a fluorescent lamp is lit at a frequency of several tens of kHz or more, a luminous efficiency is improved and a power saving effect is obtained. Is widespread. Such a discharge lamp lighting device has excellent features compared to conventional copper-iron type ballasts, such as a power saving effect, immediate start-up, low noise, light weight, etc. Therefore, there are problems that the cost is increased, and the discharge lamp is not necessarily suitable for high-frequency lighting because an existing one developed for a copper-iron type ballast is used.

[0003] Among these lamps, a discharge lamp has recently been realized and started to be popularized by realizing a fluorescent lamp dedicated to high frequency lighting (hereinafter referred to as "Hf lamp"). FIG. 14 shows the characteristics of the Hf lamp. There are a T8 lamp with a tube diameter of about 25.5 mm and a T5 lamp with a tube diameter of about 16 mm, and a length of 2 to 5 mm.
There are feet, and it is thought that more variety of Hf lamps will increase in the future. These Hf lamps are intended to improve the luminous efficiency in high-frequency lighting, and the luminous efficiency (= light output [lm] / lamp power) of the discharge lamp, which is an index thereof, is as high as about 100 [lm / w]. Therefore, great energy saving effect is expected. When designing a high-frequency lighting device for these Hf lamps, different types of Hf lamps have different VI characteristics, and lighting circuits having different load characteristics are prepared to obtain a rated output. There is a need.

FIG. 15 is a circuit diagram showing an example of a discharge lamp lighting device for an Hf lamp. The power supply circuit 20 includes an AC power supply A
C is full-wave rectified by a rectifier circuit 2 composed of a diode bridge via a filter circuit 1 and then choke coils L ₀ ,
The switching element Q ₀ and the control circuit IC _1, a diode D _0, includes a step-up chopper circuit composed of the smoothing capacitor C _0, boosted at both ends of it at the smoothing capacitor C ₀ that controls on and off the switching element Q ₀ A DC voltage _VDC is obtained. Thus, the power supply circuit 20
By providing a boost chopper circuit, it is possible to improve the power factor and suppress harmonic current distortion.

In the inverter circuit 21, a pair of
Iod D₁, D_TwoAnd switching element Q₁, Q_TwoBut
The switching element Q connected in series and on the low potential side_TwoThis
DC cut capacitor C between the emitter and emitter₁,Both
Choke coil L₁And filament of discharge lamp La
Connected to the non-power side of the filament
Resonant capacitor C_TwoIs connected, and the discharge lamp La
Including choke coil L ₁And capacitor C_TwoResonance circuit
Constitutes a load circuit. Also, a pair of switches
Switching element Q₁, Q_TwoThe on / off signal of
The resonance current of the circuit is fed back by the current transformer CT.
Signal is used. In addition, the load circuit is
Switching element Q_TwoAbout the switch
Ching element Q_TwoControl signal 21a
Operates and after a certain period of time (than when turned off by the feedback signal)
As soon as possible)_ThreeForce off
As a result, the switching element Q_TwoOn duty
To control the filament preheating and dimming of the discharge lamp La.
Output control is performed.

[0006]

However, as described above, the discharge lamp (Hf lamp) has a unique V
Since it has -I characteristics, it is necessary to have load characteristics suitable for the discharge lamp used in order to obtain the rated output,
Considering other conditions such as for one lamp or two lamps, rated voltage of 100 V or 200 V, etc., if a discharge lamp lighting device suitable for each type of discharge lamp is prepared, the type becomes enormous. Would.

In order to solve such a problem, Japanese Patent Publication No. 7-68664 proposes a discharge lamp lighting device capable of lighting a plurality of types of rated discharge lamps. This conventional device focuses on the starting voltage of the discharge lamp in order to adapt to a discharge lamp having a different lamp current and lamp power, and determines the type of discharge lamp by detecting the starting voltage and the lamp current, and determining the result. Based on the above, control is performed to switch to a load characteristic according to the type of the discharge lamp.

However, in the conventional apparatus described in the above publication, it is necessary to store the load characteristics according to the type of the discharge lamp, and it is possible to widely adapt to the load characteristics of the discharge lamp. However, there is a disadvantage that the configuration of the control circuit and the like becomes complicated. Accordingly, the present inventors have proposed FIG.
As shown in FIG. 4, attention is paid to the fact that at least the rated lamp current and the tube diameter are substantially the same even if the rated lamp power is different among the so-called Hf lamps. Compatible with discharge lamps.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to pay attention to the lamp characteristics of a discharge lamp dedicated to high-frequency lighting, and to use a simple configuration for the type of discharge lamp. It is an object of the present invention to provide a discharge lamp lighting device that can be shared and can light a discharge lamp dedicated to high-frequency lighting most efficiently.

[0010]

According to the first aspect of the present invention, there is provided a DC power supply for obtaining a DC output from an AC power supply, and a discharge lamp for converting the DC output of the DC power supply into a high-frequency output. Inverter means for lighting, discriminating means for discriminating which discharge lamp is connected to the inverter means among a plurality of types of discharge lamps having substantially equal rated lamp currents and different rated lamp powers, and a discrimination result by the discriminating means A high-frequency current output from the inverter means according to the correction means for correcting the load characteristics of the discharge lamp so that the high-frequency current is approximately equal to the rated lamp current suitable for the connected discharge lamp, When different types of discharge lamps having different rated lamp powers but having at least substantially the same rated lamp current are connected, the type of the discharge lamp is determined by the determination unit, and the correction unit determines the type of the discharge lamp. Discrimination result to be corrected in the load characteristics suitable for a discharge lamp which is connected in depending on, it can be turned a plurality of kinds of discharge lamps at approximately the rated output Te. As a result, it is possible to provide a discharge lamp lighting device that can be shared with the types of discharge lamps with a simple configuration and can light the discharge lamp dedicated to high-frequency lighting most efficiently.

According to a second aspect of the present invention, in the first aspect of the present invention, the inverter means can supply a rated lamp current to a type of discharge lamp having a maximum rated lamp power among a plurality of types of discharge lamps. The correction means corrects the load characteristic of the discharge lamp by changing the operating condition of the inverter means when another type of discharge lamp is connected, and when the discharge lamp is replaced with a different type of discharge lamp. The load characteristics are corrected by changing the operating conditions of the inverter means.
Even after replacement, the discharge lamp can be lit at almost the rated output.

According to a third aspect of the present invention, in the second aspect of the present invention, the correcting means corrects the load characteristics of the discharge lamp by changing the DC output of the DC power supply when another type of discharge lamp is connected. It is characterized in that the load characteristics are corrected by changing the DC output of the DC power supply when the discharge lamp is replaced with a different type of discharge lamp, so that the discharge lamp can be lit at almost the rated output even after replacement.

According to a fourth aspect of the present invention, in the second aspect of the present invention, the correction means corrects the load characteristic of the discharge lamp by changing the oscillation frequency of the inverter when another type of discharge lamp is connected. It is characterized in that when the discharge lamp is replaced with a different type of discharge lamp, the load characteristic is corrected by changing the oscillation frequency of the inverter means, and the discharge lamp can be lit at almost the rated output even after replacement.

According to a fifth aspect of the present invention, in the first or second aspect, the inverter means includes a pair of switching elements connected in series between the output terminals of the DC power supply, and a DC voltage between at least one switching element. A choke coil connected in series via a cutting capacitor and a series resonance circuit consisting of a resonance capacitor having a discharge lamp connected between both ends, and a DC output voltage of a DC power supply is rated for a plurality of types of discharge lamps. It is characterized in that it is set to be at least 2 の 2 times the maximum rated lamp voltage among the lamp voltages, so that the amount of change in the lamp current when the lamp is replaced with a different type of discharge lamp is reduced. The amount of correction by the correction means can be reduced.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the discharge lamp is a standardized discharge lamp dedicated to high-frequency lighting and a discharge lamp having a luminous efficiency of 850 lumens / watt or more. It is characterized by the following.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A discharge lamp lighting device according to the present invention
As shown in FIG. 14, a plurality of types of discharge lamps dedicated to high-frequency lighting with different rated lamp powers but equal rated lamp currents (hereinafter, unless otherwise specified, a “discharge lamp” is an Hf lamp dedicated to high-frequency lighting. ) Can be lit in a state close to the rated output as much as possible with only simple type discrimination and load characteristic correction control.
It is not necessary to prepare a lighting device with a different design for each type of discharge lamp as in the past, and so-called MT is promoted, for example, standardization and common use of inverter circuits, and cost reduction and high performance can be achieved. Is what you do.

Specifically, for the target discharge lamp,
The load characteristics determined by the inverter means supplying high-frequency power to the discharge lamp are corrected in accordance with the type of discharge lamp so that the lamp current becomes substantially equal to the rated lamp current of the discharge lamp. The light can be turned on at the rated output. Here, in the discharge lamp shown in FIG. 14, the tube diameter (= about 25.5 mm) and the rated lamp current (=
255 mA) are equal and the rated lamp power (= 16 W, 32
W) different discharge lamps (FHF16W-EX-
N, FHF32W-EX-N) as an example, the basic principle of the present invention will be described with reference to the load characteristic diagram of FIG.

First, a discharge lamp having a rated lamp power of 32 W is supplied by a conventional device shown in FIG. 15 so that a rated lamp current of 255 mA is supplied so that load characteristics (the oscillation frequency f of the inverter circuit 21, the boosting voltage f, Set the output voltage _VDC of the chopper circuit). At this time, the operating point of the discharge lamp lighting device is point A in FIG. Next, when the discharge lamp is replaced with one having a rated lamp power of 16 W, as shown in FIG. 16, the lamp current becomes ΔI (= 319.3-248.0 = 7).
Since the current rises by 1.3 mA), the rated lamp current is exceeded and an optimum rated output cannot be obtained. That is, since the load characteristics are fixed, the operating point moves from the point A to the point B. The reason why the lamp current increases when the discharge lamp is replaced as described above is as follows. That is, the on time of the switching element to Q ₁ Write and replacing the discharge lamp is not directly connected to the load circuit becomes long, since the impedance which controls the lamp current is inductive, the switching element Q ₁ on The longer the time, in other words, the lower the switching frequency, the lower the impedance, so that the lamp current increases.

However, regarding the above two types of discharge lamps,
Therefore, both rated lamp currents are equal to 255 mA.
Thus, the inverter circuit 21 included in the discharge lamp lighting device is activated.
Vibration frequency, resonance frequency of LC resonance circuit, or
Power supply voltage V of the data circuit 21 _DCNegative by changing
The load characteristic is moved substantially in parallel, and the operating point changes from point B to point C.
The lamp current close to the rated lamp current.
Can be opened.

Hereinafter, the present invention will be described in detail with reference to embodiments. (Embodiment 1) FIG. 1 shows a circuit configuration of the present embodiment. A pulsating voltage, which is full-wave rectified by a rectifier circuit 2 from an AC power supply AC via a filter circuit 1, is boosted and smoothed by a boost chopper circuit 3. You.

The step-up chopper circuit 3 includes a choke coil L
₀ , a switching element Q ₀ , a diode D ₀ , a smoothing capacitor C ₀ , and a control circuit IC ₁ for performing on / off control of the switching element Q ₀ . The switching element Q ₀ is connected between the output terminals of the rectifier circuit 2 via the choke coil L ₀ . Smoothing capacitor C ₀ is connected in parallel to switching element Q ₀ via diode D ₀ . The control circuit IC ₁ operates by receiving power supply from the DC power supply E, detects an input voltage from the voltage dividing resistors R ₁ and R ₂ connected between the output terminals of the rectifier circuit 2, and detects the input voltage of the choke coil L ₀ . The input current is detected by the secondary winding, and the output voltage is detected by the voltage dividing resistors R ₄ , R ₅ and R ₉ connected in front of the smoothing capacitor C ₀ .
And Thus, the control circuit IC ₁ ', to be substantially constant DC output voltage V _DC, which is boosted across the smoothing capacitor C ₀ is obtained, and controls on and off the switching element Q _0.

An inverter is connected between the output terminals of the boost chopper circuit 3.
Data circuit 4 is connected to the output of the step-up chopper circuit 3.
Force voltage V_DCIs converted to a high frequency AC voltage by the inverter circuit 4.
Is supplied to the load circuit 5 having the discharge lamp La.
You. The inverter circuit 4 includes a smoothing capacitor C₀Parallel connection
A pair of connected diodes D₁, D_TwoAnd a pair of switches
Ching element Q₁, Q_TwoAnd each switching element Q₁, Q
_TwoCurrent signal that provides a control signal to turn on and off
Lance CT and one switching element Q_TwoBase of
Sub-switching element Q for control inserted between emitters
_ThreeAnd the switching element Q_TwoWhen a control signal to
Both are switching elements Q_TwoAfter a certain period of time
Secondary switch (earlier than turned off by feedback signal)
Element Q _ThreeSwitch off by forcing the switch off.
Ching element Q_TwoInverter that controls the on-duty of the motor
And a control circuit 4a.

[0023] Between the collector and emitter of the switching element Q _2, through the primary winding n ₁ of the current transformer CT, a capacitor C ₁ for DC cut choke coil L ₁ for resonance, the discharge lamp La and release the load circuit 5 consisting of a capacitor C ₂ for resonance connected to the non-power supply side of the filament of the lamp La is connected. And Thus, the resonance current of the resonance circuit consisting of the choke coil L ₁ and capacitor C ₂ is, the current transformer CT are fed back to the base of switching element Q _1, Q ₂ of the inverter circuit 4 by the feedback signal switching device It is used as a control signal for controlling ON / OFF of Q ₁ and Q ₂ .

[0024] In this embodiment, in order to determine the type of discharge lamp La constituting the load circuit 5, connected a series circuit of resistors R _10, R ₁₁ for the lamp voltage detection to the power supply side of the filament of the discharge lamp La Then, the detected lamp voltage is changed by the comparator IC _{2 to} the power supply voltage of the DC power supply E by the resistors R ₁₂ and R ₁₂ .
It is compared with the threshold voltage obtained by dividing the voltage at ₁₄ . In other words, (the voltage drop across the resistor R ₁₁₎ detects voltage if lit rated discharge lamp FHF32W shown in FIG. 14 as the load is about twice the detection voltage when you are loading the discharge lamp FHF16W If the resistance values of the resistors R ₁₂ and R ₁₄ are determined so that the threshold value takes a value between the two detection voltages, the comparator IC can be used when a discharge lamp of FHF32W is used as a load. ₂ output is H level, FH
When the load is an F16W discharge lamp, the comparator I
The output of C ₂ becomes the L level. The detection voltage in this embodiment (the voltage drop across the resistor R ₁₁₎ is input to the non-inverting terminal of the comparator IC ₂ via the time constant circuit consisting of the diode D ₃ and capacitor C ₄ and a resistor R ₁₃ ,
This prevents erroneous detection when the lamp voltage fluctuates instantaneously.

Furthermore, the output terminal of the comparator IC ₂ based switching element Q ₄ is connected. This switching element Q ₄ is connected in parallel to a resistor R ₅ for detecting the output voltage of the boost chopper circuit 3. Thus, F
Since the output of the comparator IC ₂ becomes the H level the discharge lamp HF32W when a load, both ends of the resistor R ₅ is short-circuited switching element Q ₄ is turned on. At this time, when replacing the discharge lamp La to the discharge lamp of FHF16W, the output of the comparator IC ₂ and the switching element Q ₄ is turned off to the L level, the voltage input to pin 12 of the control circuit IC ₁ is increased I do.

[0026] That is, the output voltage V _DC of the boost chopper circuit 3 of the apparent switching element Q ₄ is viewed from the control circuit IC ₁ by turning off is increased, the control circuit IC ₁
Controls the switching of the switching element Q _{0 in the} direction of decreasing the output voltage _VDC . As a result, the output voltage _VDC of the boost chopper circuit 3 becomes lower than when the discharge lamp of the FHF 32W is turned on. Therefore, the inverter circuit 4
When the input voltage (voltage V _DC ) of the discharge lamp La decreases, the lamp current supplied to the discharge lamp La also decreases.
Even when the discharge lamp is replaced with an F16W discharge lamp, the rated lamp current can be obtained. That is, in this embodiment, constitutes a comparator IC ₂ and the switching element Q ₄ at discriminating correction circuit 6, main components and determining means and a correction means. Note that the discharge lamp La was set to FHF16W.
When replacing the discharge lamp with the discharge lamp of FHF32W, the input current (voltage V _DC ) of the inverter circuit 4 is increased, contrary to the above operation, so that the lamp current supplied to the discharge lamp La increases. It is clear that the load characteristics can be similarly corrected.

As described above, according to the present embodiment, two types of discharge lamps having different rated lamp voltages and the same rated lamp current (for example, FHF16W-EX- shown in FIG. 14).
N, FHF32W-EX-N), the load characteristics (lamp current) can be corrected by increasing or decreasing the input voltage _VDC to the inverter circuit 4 according to the type, and the types are different. The inverter circuit 4 can be shared with the discharge lamp. As a result, it is not necessary to perform a different design according to the type of the discharge lamp. For example, the so-called MT of the inverter circuit 4 is promoted, and the cost can be reduced.

(Embodiment 2) FIG. 2 shows the circuit configuration of the present embodiment. However, since the basic configuration is the same as that of Embodiment 1, common parts are denoted by the same reference numerals. Is omitted. As shown in FIG. 2, the pulsating voltage that has been full-wave rectified by the rectifier circuit 2 from the AC power supply AC via the filter circuit 1 is boosted and smoothed in the boost chopper circuit 7.

The boost chopper circuit 7 has substantially the same configuration as the boost chopper circuit 3 of the first embodiment, and turns on the choke coil L ₀ , the switching element Q ₀ , the diode D ₀ , the smoothing capacitor C ₀ , and the switching element Q ₀ . off perform control consists of a control circuit IC _1. The control circuit IC _1, may be used a general-purpose chopper IC (e.g., unit load Co. UC3582). Since the operation is almost the same as that of the first embodiment, the detailed description is omitted.

An inverter circuit 8 is connected between the output terminals of the boost chopper circuit 7. This inverter circuit 8
Is a F in which a parasitic diode (not shown) is connected in anti-parallel.
This is a so-called half-bridge type inverter circuit that alternately switches a pair of switching elements Q ₁ and Q ₂ composed of ET at a high frequency, and an oscillator IC ₅ that determines the oscillation frequency of the inverter circuit 8 (for example, μP manufactured by NEC Corporation)
And C1094), the square wave signal each switching element based on given from the oscillator IC ₅ Q _1, a drive control circuit for on-off driving the Q ₂ alternately IC ₄ (for example, a IR Co. IR2111) and . However, the configuration of the inverter circuit 8 is not limited to the above-described half-bridge type, but various types such as a full-bridge type, a single-stone type, and a push-pull type can be used.

Oscillator IC_FiveOscillation frequency f_OSCIs R_T
Terminal and C_TResistance R connected to the terminal ₁₆, R₁₇And conden
Sa C_FiveIs determined by the following equation. f_OSC= (0.817R_TC_T+ 1.42 × 10^-6)^-1 Then, the oscillation frequency f expressed by the above equation_OSCSquare wave of O
Output from UT terminal.

On the other hand, the drive control circuit IC ₄ receives the square wave from the oscillator IC _{5 at the} second pin, and alternately switches from the eighth and fourth pins at a frequency corresponding to the oscillation frequency f _OSC of this square wave. It outputs a control signal for driving the elements Q ₁ and Q ₂ on and off, and also serves as a so-called driver and level shifter. A DC cut capacitor C ₁ , a choke coil L ₁ for resonance, an isolation transformer T ₁ , and a secondary side of the isolation transformer T ₁ are provided between the source and the drain of the switching element Q ₁ on the high potential side of the inverter circuit 8. A load circuit 9 including a pair of connected discharge lamps La ₁ and La ₂ and a resonance capacitor C ₂ connected to the non-power supply side of the filaments of the discharge lamps La ₁ and La _2.
Is connected. Incidentally, when there is no particular need to isolate the load circuit 9 may be omitted insulation transformer T _1.

The discrimination correction circuit 10 for discriminating the types of the discharge lamps La ₁ and La ₂ of the load circuit 9 and correcting the load characteristics includes a tertiary winding n ₃ of the insulating transformer T ₁ , a Zener diode Z
D ₁ , capacitor C _{6 and} switching elements Q ₅ , Q
₆ is constituted by a, the voltage induced in the tertiary winding n _3, detects the lamp voltage of the load circuit 9. Are connected in series to the Zener diode ZD ₁ and the capacitor C ₆ is 3 winding n _3. The base and emitter of the switching element Q ₆ is connected to both ends of the capacitor C _6, the base-emitter of the switching element Q ₅ is connected between the collector and emitter of the switching element Q _6. Then, between the collector and emitter of the switching element Q _5, the oscillation frequency f of the oscillator IC ₅ of the inverter circuit 8
Resistor R ₁₇ which determines the _OSC is connected.

By the way, the discharge lamp La₁, La_TwoLamp
Choke coil L that determines current_TwoAnd capacitor C_TwoDirectly
The column resonance circuit impedance is
Is inductive (2πfL₁), But the discharge lamp La₁, L
a_TwoThe natural vibration frequency f including₀Is given by
You. f₀= (1 / L₁C_Two−1 / (C_TwoR)^Two)^1/2/ 2π now discharge lamp La₁, La_TwoThe FHF32W discharge lamp
From the state of being used and rated lighting, FHF16W
It is assumed that the discharge lamp has been replaced. Discharge lamp La during lighting
₁, La_TwoIs equivalent to only the resistance component
Therefore, as shown in FIG. 3, the discharge lamp of FHF32W is
Natural vibration frequency f when used_{32 W}But FHF
By replacing the lamp with a 16W discharge lamp, the resistance R in the above equation becomes about half
Minutes, when a FHF16W discharge lamp is used
Natural frequency f_16WIs the above natural vibration frequency f_32WYo
Higher. For this reason, the inverter circuit 8 needs
Number f ₁To operate the FHF32W discharge lamp at the rated lighting.
When replacing the lamp with a FHF16W discharge lamp
In this case, as is apparent from FIG._LaIs ΔI _La
Will only increase. As a result, the replacement of FHF1
6W discharge lamps are used because they are lit above the rated output.
Problems such as a shortened service life occur.

In order to avoid such a situation, in the present embodiment, the discrimination correction circuit 10 uses the discharge lamps La ₁ and La _2.
Is determined, and the load characteristic is corrected by changing the oscillation frequency f of the inverter circuit 8 according to the result of the determination. In the case described above, it is detected that the discharge lamps La ₁ and La ₂ have been changed from a discharge lamp of FHF32W to a discharge lamp of FHF16W, and the oscillation frequency f of the inverter circuit 8 is detected.
Is the frequency f at which the discharge lamp of the FHF32W was operated at the rated value.
Only from ₁ Delta] f high is changed in a frequency f _2. That is, if the oscillation frequency f of the inverter circuit 8 is increased,
As shown in FIG. 3, the lamp current I _La decreases and the FHF 16
The rated lamp current can be supplied to the W discharge lamp.

Next, a specific correction operation by the discrimination correction circuit 10 will be described. FHF32W discharge lamp and FH
F16W discharge lamps have the same rated lamp current but different rated lamp voltages, and the FHF32W discharge lamp has a higher rated lamp voltage. Utilizing this, the discharge lamp L
a _1, La ₂ is a Zener diode ZD ₁ is turned on, which is connected to the tertiary winding n ₃ of the insulating transformer T ₁ when the discharge lamp FHF32W, the Zener diode ZD ₁ when the discharge lamp FHF16W off and I will keep it. In this way, only if the zener diode ZD ₁ is ON, the switching element Q ₆ capacitor C ₆ is charged is turned on.

Switching element Q₆Is on when
Switching element Q_FiveTurns off and the oscillator IC_FiveR_T
The resistor R connected to the terminal₁₇Is the switching element Q_Five
Oscillator IC_FiveOscillation frequency
f_OSCBecomes a low value, and as a result, the
The vibration frequency f also decreases. On the other hand, the switching element Q₆But
Switching element Q when off_FiveTurns on and departs
Vibrator IC_FiveR_TThe resistor R connected to the terminal₁₇Ha sui
Switching element Q _FiveOscillator IC
_FiveOscillation frequency f_OSCIs high, and consequently
The oscillation frequency f of the data circuit 8 also increases.

That is, FHF3 is applied to the discharge lamps La ₁ and La ₂ .
In the case where the 2W discharge lamp is used and the rated lighting is changed to the FHF 16W discharge lamp, the discrimination correction circuit 1
0 In detecting a decrease of the lamp voltage the Zener diode ZD ₁ is turned off, the switching element Q ₆ is turned off. Therefore, as described above, the oscillation frequency f of the inverter circuit 8 increases, and the lamp current I _La decreases.
The rated lamp current can be supplied to the discharge lamp of F16W.

As described above, in the present embodiment, the load circuit 9
Since the determination circuit 10 corrects the load characteristics by increasing or decreasing the oscillation frequency f of the inverter circuit 8 in accordance with the result of determining the type of the discharge lamps La ₁ and La ₂ used for the discharge lamps, different types of discharge lamps are used. Inverter circuit 8 for electric light
Can be shared. As a result, it is not necessary to design differently according to the type of the discharge lamp. For example, the so-called MT of the inverter circuit 8 is promoted, and the cost can be reduced.

(Embodiment 3) FIG. 4 is a circuit diagram of the present embodiment.
The inverter circuit 8 'and the discrimination correction circuit
Since the basic configuration other than 11 is common to the second embodiment,
Common parts are denoted by the same reference numerals, and description thereof is omitted.
Abbreviate. Also implement inverter circuit 8 'in the present embodiment
This is a half-bridge type similar to that of mode 2,
Data control circuit IC₆A pair of switching elements Q
₁, Q_TwoAre turned on and off alternately. However, the inverter
The oscillation frequency f of the circuit 8 'is the inverter control circuit IC₆To
Is fixed.

The discrimination correction circuit 11 includes an insulating transformer T₁of
Tertiary winding n_ThreeDiode rectifies the voltage induced in the
Ridge DB₁And the resistance R₁₈Through the diode bridge
DB ₁Capacitor C connected between the output terminals of₇When,
Choke coil L for resonance of inverter circuit 8 '₁First
Winding n_X1And a saturable inductor Lx connected in series.
The secondary winding n of the saturable inductor Lx_X2Is the resistance R₁₇To
Via the smoothing capacitor C₇Is connected to both ends of
ing. That is, the saturable inductor Lx is
Once T₁Tertiary winding n_ThreeThe voltage induced in the diode
Bridge DB₁And smoothing capacitor C₇Rectifying and smoothing
DC voltage is superimposed on the DC voltage.
The conductance value changes. As a result, the resonance cho
Cucoil L₁, Capacitor C_TwoAnd saturable inductor
The resonance condition of the series resonance circuit composed of Lx (natural oscillation frequency
Number) also changes.

Here, the secondary winding n _X2 of the saturable inductor Lx is wound in the same manner as the primary winding n _X1, and the voltage induced in the tertiary winding n ₃ of the insulating transformer T ₁ That is, the higher the lamp voltage of the discharge lamps La ₁ and La ₂ , the higher the superimposed DC voltage. As a result, the inductance value of the saturable inductor Lx decreases as the lamp voltage increases, and as the lamp voltage decreases. To rise.

Next, a specific determination and correction operation of the determination and correction circuit 11 will be described. As already explained, F
The rated lamp voltage is different between the discharge lamp of HF32W and the discharge lamp of FHF16W, and the rated lamp voltage of the discharge lamp of FHF32W is higher. Utilizing this, the discharge lamps La ₁ ,
When La ₂ is a discharge lamp of FHF32W, the saturable inductor Lx is saturated, and when La2 is a discharge lamp of FHF16W, the saturable inductor Lx is not saturated. When the saturable inductor Lx is saturated, the natural oscillation frequency of the series resonance circuit shifts to the high frequency side, and the oscillation frequency of the inverter circuit 8 'is fixed, so that the load characteristic moves in parallel, resulting in a ramp. The current increases.

On the other hand, when the saturable inductor Lx does not saturate, the natural oscillation frequency of the series resonance circuit shifts to a lower frequency side, and the load characteristic shifts in the direction of decreasing the lamp current. In other words, the discharge lamps La ₁ and La ₂ have FHF 32
From the state of rated lighting using a discharge lamp of W, F
When the HF 16W discharge lamp is replaced, the discrimination correction circuit 11
Detects a decrease in the lamp voltage and changes the saturable inductor Lx, which has been saturated up to that time, to a non-saturated state. Therefore, as described above, the choke coil L for resonance is used.
_1, it shifts the natural frequency of the series resonant circuit comprising a capacitor C ₂ and a saturable inductor Lx to a lower frequency by translating the load characteristics, so reducing the lamp current, the rated against discharge lamp FHF16W It becomes possible to supply a lamp current.

As described above, in the present embodiment, the load circuit 9
The load characteristic is changed by changing the natural oscillation frequency of the series resonance circuit composed of the choke coil L ₁ , the capacitor C _{2 and the} saturable inductor Lx according to the result of discriminating the types of the discharge lamps La ₁ and La ₂ used in the above. The provision of the discrimination correction circuit 11 for correction allows the inverter circuit 8 'to be shared for different types of discharge lamps. As a result, it is not necessary to design differently according to the type of the discharge lamp. For example, the so-called MT of the inverter circuit 8 'is promoted, and the cost can be reduced.

In the present embodiment, the natural oscillation frequency of the series resonance circuit is changed by changing the inductance value. However, it is possible to change the natural oscillation frequency in the same manner by changing the capacitance value. It goes without saying that a similar effect can be obtained in this case as well. (Embodiment 4) FIG. 5 shows the circuit configuration of the present embodiment, but since the basic configuration is the same as that of Embodiment 3, common parts are denoted by the same reference numerals and description thereof is omitted. Only the determining means for determining the type of the discharge lamp, which is a feature of the present embodiment, will be described. The following embodiments including this embodiment are all related to the discriminating means, and can be arbitrarily combined with the correcting means described in the first to third embodiments.

[0047] As shown in FIG. 5, 'the source-drain load circuit 9 of switching element Q ₂ on the low potential side of the' inverter circuit 8 is connected. Load circuit 9 ', a choke coil L _1, the series resonant circuit is constituted by the capacitor C _8, the discharge lamp La in parallel with the capacitor C ₈
A primary side of the transformer T ₂ and are connected. Further, the primary side of the transformer T ₃ is inserted between the switching element Q ₂ and the capacitor C _8.

Transformer T ₂ connected in series to discharge lamp La
It is intended to detect a lamp current I _La, the detection voltage corresponding to the lamp current I _La on the secondary side is induced. On the other hand, the transformer T ₃ are intended to detect the resonant current I _INV supplied from the inverter circuit 8 ', the detection voltage corresponding to the inverter current I _INV on the secondary side is induced.

By the way, as described above, the impedance of the discharge lamp La during lighting can be regarded as substantially only a resistance component, and the resistance value is proportional to the lamp power as long as the lamp current is substantially constant. Further, the resonance current I _INV of the inverter circuit 8 'is a combined current of the capacitive current Ic flowing through the capacitor C _8, a lamp current I _La flowing through the discharge lamp La. As shown in FIG. 6, the capacitive current Ic is advanced in phase with respect to the combined current, and the combined current (the resonance current Ic
_INV ) and the lamp current I _La can be detected to determine the type of the discharge lamp La. FIG.
(A) is a discharge lamp of FHF32W, and (b) is FHF1.
6W resonance current I _INV of the discharge lamp, the capacitive current Ic, the lamp current I _La is a waveform diagram illustrating respectively. In this embodiment, the transformer T ₂ for detecting a lamp current I _La, a transformer T ₃ for detecting a resonant current I _INV supplied from the inverter circuit 8 ', the secondary output of the transformer T ₂ (detection voltage) Switching element Q ₇ to be switched
When a switching element Q ₈ of the base-emitter is connected between the collector and emitter of the switching element Q ₇ while being switched by the secondary output of the transformer T ₃ (detection voltage), the base to the collector of the switching element Q ₈ There discriminating circuit 12 is provided with a switching element Q ₉ in which the resistance to the collector R ₂₀ and capacitor C ₉ are connected in series is connected, the switching element Q
₉ signal taken from a connection point between the collector and the resistor R ₂₀ of is inputted to the control circuit IC _6.

In the determination circuit 12, the switching element
Q₇Turns on when the switching element Q₈Is turned off,
As a result, the switching element Q₉Also turns off. On the other hand,
Switching element Q₇When switching off, switching element Q₈
Is turned on, and as a result, the switching element Q₉Also on
Become resistance R₂₀Through the capacitor C₉Is charged.
That is, the lamp current I_LaAnd resonance current I_INVPhase difference with
The larger the φ, the larger the switching element Q₈Long on-time
The switching element Q₉The on-time is longer
Capacitor C₉Will also increase the
Switching element Q ₉Operating in the saturation region,
Sa C₉Can be controlled.

Now, a discharge lamp of FHF32W and FHF16
When compared with a discharge lamp of W, the rated lamp voltage F
The resistance component when the HF32W discharge lamp is turned on is larger. Therefore, the capacitive current Ic with respect to the resonance current I _INV
Occupies a larger amount, and the capacitive current Ic leading the phase becomes dominant over the lamp current I _La . Therefore, FHF32
The phase difference φ ₁ of the discharge lamp of W becomes larger than the phase difference φ ₂ of the discharge lamp of FHF16W (see FIG. 6).

[0052] That is, since different charging amount of the capacitor C ₉ is a phase difference phi _1, the phi ₂ of the large and small, the capacitor C ₉
, The type of the discharge lamp La can be determined. The control circuit IC for the voltage across the inverter circuit 8 of the capacitor C ₉ showing the determination result '
₆ and the control circuit IC as in the second embodiment.
_The load characteristic may be corrected by varying the oscillation frequency of the inverter circuit 8 'according to the type of the discharge lamp La.

(Embodiment 5) FIG. 7 shows a circuit configuration of the present embodiment. However, since the basic configuration is the same as that of the embodiment 2, common parts are denoted by the same reference numerals. Is omitted, and the discriminant correction circuit 1 which is a feature of the present embodiment is omitted.
Only 3 will be described. In general, when a discharge lamp having substantially the same rated lamp current and different rated lamp voltage is lit by the same inverter circuit, the discharge lamp is operated as long as the voltage and input power factor of the power supply for supplying DC power to the inverter circuit do not significantly change. The input current from the power supply increases in proportion to the impedance (resistance component) of the lamp. For example, FIG.
Input current I at the time of steady lighting of the discharge lamp of FHF16W shown in FIG.
_{In in1} and the input current I _in2 at the time of steady lighting of the discharge lamp of the FHF 32W shown in FIG. 4B, I _in2 increases to nearly twice I _in1 . In particular, when the power supply unit is a boost chopper circuit 3 using a general-purpose chopper IC (for example, UC3582 manufactured by Unit Road Co., Ltd.), the output voltage V _DC generated at both ends of the smoothing capacitor C ₀ is monitored, and the output voltage V _DC Of the switching element Q ₀ is controlled to be substantially constant, so that the discharge lamp of the FHF 16W and the FHF 32W
Even if the discharge lamp is replaced, the output voltage _VDC does not abnormally increase or decrease in voltage, and the power consumption (lamp power) of the load circuit 9 directly affects the input current of the boost chopper circuit 3.

Therefore, in this embodiment, the discharge lamps La ₁ , L are detected by detecting the input current flowing through the shunt resistor Ra connected in series to the switching element Q ₀ of the boost chopper circuit 3.
as well as determine the type of a _2, is determined correction circuit 13 so as to vary the oscillation frequency f of the inverter circuit 8 in accordance with the type of the discharge lamp La _1, La ₂ have the same configuration as in Embodiment 2 It is provided.

As shown in FIG. 7, the discrimination correction circuit 13
The comparator IC ₇ compares the voltage across the capacitor C ₁₀ connected in parallel with the resistor Ra with the threshold voltage provided by the DC power supply E _0, and charges the capacitor C ₁₁ with the output of the comparator IC _7. C ₁₁
Turning on and off the switching element Q ₆ the voltage across and input to the base of switching element Q _6. That is, compared to the input current threshold voltage is converted into a voltage (approximately one-half of the total input current) by the resistance Ra when the switching element Q ₀ is turned on.

For example, a discharge lamp of FHF32W and FHF1
In a 6W discharge lamp, the input current is also large because the FHF32W discharge lamp has a larger resistance component during lighting. Therefore, when the discharge lamps La ₁ and La ₂ are discharge lamps of FHF 32W, the detection voltage of the resistor Ra exceeds the threshold value, and the output of the comparator IC ₇ becomes H level, and the FHF 16W
Keep as the output of the comparator IC ₇ is L level voltage detected by the resistor Ra falls below the threshold at the time of the discharge lamp. By doing so, the discharge lamps La ₁ , L
The switching element Q ₆ output becomes the H level only comparator IC ₇ when a ₂ is the discharge lamp FHF32W
Turns on.

That is, the discharge lamp La₁, La_TwoFHF3
From the state of rated lighting using a 2W discharge lamp
When replacing the discharge lamp with the FHF16W, the discrimination correction circuit 1
In 3, the decrease in the input current in the boost chopper circuit 7 is detected.
Take out switching element Q₆Turns off. For this reason,
As in the second embodiment, the oscillation frequency f of the inverter circuit 8 increases.
And the lamp current I_LaOf the FHF16W
Rated lamp current can be supplied to discharge lamps
Becomes In addition, the discharge lamp La₁, La_TwoOf FHF16W
From the state of rated lighting using a discharge lamp, FHF
When replacing with a 32W discharge lamp, the inverter circuit 8
The oscillation frequency f of the lamp current _LaIncreases and F
Supply rated lamp current to HF32W discharge lamp
Obviously, this is possible.

If the threshold voltage to be compared by the comparator IC ₇ is multi-step, the type of the discharge lamp can be more finely and densely determined. (Embodiment 6) FIG. 9 shows a circuit configuration of the present embodiment, but since the basic configuration is common to Embodiments 2 and 5, the common parts are denoted by the same reference numerals and the description is omitted. The description will be omitted, and only the discrimination correction circuit 14 which is a feature of the present embodiment will be described.

In the present embodiment, the discrimination correction circuit 14
Discharge lamp La as in mode 5₁, La _TwoInput by type
By detecting the difference in current, the type of discharge lamp can be determined.
In addition, after the determination, both of the resistors Rb for detecting the input current are used.
Switching element Q at the end_TenDischarge by short circuit
Light La₁, La_TwoAt the time of steady lighting of the detection resistor Rb
To avoid power consumption.

That is, after the start of power supply from the AC power supply AC, the discriminant correction circuit 14 sets at least the discharge lamps La ₁ ,
A timer circuit 14a for counting a sufficient time until La ₂ enters a steady lighting state, and a switching element Q ₁₀ composed of a thyristor due to the time-up of the timer circuit 14a.
A capacitor C ₁₂ which is charged by a driver circuit 14b to turn on, input current detected via the resistor Rb,
And a comparator IC ₉ for comparing the threshold voltage given voltage across the capacitor C ₁₂ and the DC power source E _1. The output of the comparator IC ₉ is used to output the switching elements Q ₁ and Q ₂ of the inverter circuit 8 ″.
Control circuit IC ₈ (for example, I
Has an oscillation frequency of the R Companies IR2155) so as to turn on and off the switch SW ₂ for varying.

When the power supply from the AC power supply AC is started, the timer circuit 14a counts the time, and the discharge lamps La ₁ and La ₂ are output from the comparator IC ₉ .
Is determined. Then, in accordance with the result of the determination, the control circuit IC is used similarly to the second or fifth embodiment.
₈ , the oscillation frequency f of the inverter circuit 8 ″ is increased / decreased, and discharge lamps having different rated lamp voltages (for example, FHF
Even when the 16 W discharge lamp and the FHF 32 W discharge lamp are replaced, the load characteristics can be corrected so that the rated lamp current is supplied. Moreover, since the time count by the timer circuit 14a is if finished, the switching element Q ₁₀ by the driver circuit 14b is turned on,
Detection resistor Rb are short-circuited by the switching element Q _10, it can be avoided power consumption in the resistor Rb.

(Embodiment 7) FIG. 10 is a circuit diagram of the present embodiment.
Although the configuration is shown, a rectifier circuit 2, a boost chopper circuit
7, the configuration of the inverter circuit 8 ″ is the same as that of the sixth embodiment.
Therefore, common parts are assigned the same reference numerals and explained.
Description is omitted. Note that, in the load circuit 5 'of the present embodiment,
In addition, there is one discharge lamp La. In the present embodiment,
A high frequency voltage of a rectangular wave is generated from the
Choke coil L₁And capacitor C _TwoSeries resonance with
By vibrating in the circuit, discharge occurs as shown in FIG.
An approximately sinusoidal high frequency current is supplied to the lamp La to discharge the lamp La.
Is lit.

Here, the discharge lamp La discharges FHF32W.
And a voltage V applied to both ends of the discharge lamp La using a lamp.₁Is 1
Rated run at 40V, 180V, 220V
So that the current (= 255 mA) is supplied.
Choke coil L of resonance circuit ₁And capacitor C_TwoThe value of
Set. Here, the discharge lamp La is a discharge lamp of FHF16W.
Lamp current I before and after replacement when replaced_LaMeasured
However, the result as shown in FIG. 12 was obtained. Fig. 12
As is apparent from FIG.₁Is higher, paraphrase
If the input voltage to the inverter circuit 8 ″ (step-up chopper
Output voltage of path 7) V_DCIs higher, the discharge of FHF16W
Lamp power when replacing the lamp with a discharge lamp of FHF32W
Change in flow ΔI_LaLess is.

When the voltage V ₁ = 140 V, the FHF 32
In order to keep the discharge lamp of W lit, the peak value V _La32 (peak) of the lamp voltage is twice the route of 128 V from FIG.
That is, 181 V (the lamp voltage V _La32 is approximate to a sine wave)
It is necessary. However, as shown in FIG. 11, the voltage V ₁ applied to both ends of the discharge lamp La because it is 140 V, in order to maintain the lighting of the discharge lamp La, it is necessary to strengthen the resonance of a series resonant circuit.

On the other hand, in the case of a discharge lamp of FHF16W,
Since the peak value V _La16 (peak) of the lamp voltage for maintaining lighting is twice the route of ₆₄ V, that is, 90.5 V,
No need for boosting the voltages V _1, such as when the discharge lamp FHF32W. That is, the reactive current required to boost the voltage when the discharge lamp of the FHF 32W is turned on is the FHF 16
When the W discharge lamp is turned on, it also flows as a lamp current, and as a result, the lamp current increases.

However, when the voltage V ₁ is 220 V,
The voltage applied to the discharge lamp La becomes 220 V, and FHF
In order to maintain the lighting of the 32W discharge lamp, it is not necessary to strengthen the resonance in the series resonance circuit, and the discharge lamp La is connected to the FHF 32
When the discharge lamp of W is replaced with a discharge lamp of FHF16W, the increase ΔI _La of the lamp current before and after the replacement is small.

From the above, among the plurality of types of discharge lamps,
Also rated lamp voltage V_LaV for discharge lamps with high₁≧ √
2V_LaSo that the output voltage V of the inverter circuit 8 ″ becomes₁
In other words, if the peak value of
DC output voltage V _DCHowever, there are certain types of discharge lamps
2√2 times the maximum rated lamp voltage among rated lamp voltages
If it is set to be above,
Even if the lamp is replaced with another type of lamp with a lower pump voltage,
Lamp current change ΔI_LaIs reduced. As a result, implementation
The correction width in the correction means described in the first to sixth embodiments is reduced.
can do. Also, for example, the discharge lamp of the present embodiment
, The change in lamp current ΔI_LaIs allowed up to ± 20mA
If so, do not use the correction means as described above.
Rated discharge of multiple types of discharge lamps with the same discharge lamp lighting device.
Can be made.

[0068]

According to the first aspect of the present invention, a DC power supply for obtaining a DC output from an AC power supply, an inverter means for converting the DC output of the DC power supply to a high-frequency output to light the discharge lamp, and the rated lamp currents are substantially equal. Determining means for determining which discharge lamp is connected to the inverter means among a plurality of types of discharge lamps having different rated lamp powers; and a high-frequency current output from the inverter means according to the determination result by the determination means. Correction means for correcting the load characteristics of the discharge lamp so as to be substantially equal to the rated lamp current suitable for the connected discharge lamp. When the discharge lamp is connected, the type of the discharge lamp is determined by the determination unit, and a negative voltage suitable for the connected discharge lamp is determined by the correction unit according to the determination result. By correcting the characteristics, it is possible to light multiple types of discharge lamps with almost the rated output.As a result, the discharge lamps can be shared with the types of discharge lamps with a simple configuration, and can be used exclusively for high-frequency lighting. There is an effect that it is possible to provide a discharge lamp lighting device capable of lighting the most efficiently.

According to a second aspect of the present invention, the inverter means can supply a rated lamp current to a type of discharge lamp having a maximum rated lamp power among a plurality of types of discharge lamps,
The correction means corrects the load characteristics of the discharge lamp by changing the operating conditions of the inverter means when another type of discharge lamp is connected. By changing the conditions, the load characteristics are corrected, and there is an effect that the discharge lamp can be turned on almost at the rated output even after replacement.

According to a third aspect of the present invention, when the correction means corrects the load characteristics of the discharge lamp by changing the DC output of the DC power supply when another type of discharge lamp is connected, the discharge lamps of different types are different. The load characteristic is corrected by changing the DC output of the DC power supply when the discharge lamp is replaced, so that the discharge lamp can be turned on almost at the rated output even after the replacement.

According to a fourth aspect of the present invention, when the correction means corrects the load characteristic of the discharge lamp by changing the oscillation frequency of the inverter means when another type of discharge lamp is connected, the discharge lamps of different types are different. In the case where the discharge lamp is replaced, the load characteristic is corrected by changing the oscillation frequency of the inverter means, so that the discharge lamp can be lit at almost the rated output even after the replacement.

According to a fifth aspect of the present invention, the inverter means includes a pair of switching elements connected in series between output terminals of the DC power supply, and a series connection between both ends of at least one switching element via a DC cut capacitor. A series resonance circuit comprising a choke coil and a resonance capacitor to which a discharge lamp is connected between both ends, and the DC output voltage of the DC power supply is the maximum rated lamp among the rated lamp voltages of a plurality of types of discharge lamps. Since the voltage is set to be 2√2 times or more, the amount of change in the lamp current when the lamp is replaced with a different type of discharge lamp is reduced, so that the amount of correction by the correcting means can be reduced. This has the effect.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment.

FIG. 2 is a circuit diagram showing a second embodiment.

FIG. 3 is a waveform chart for explaining the above operation.

FIG. 4 is a circuit diagram showing a third embodiment.

FIG. 5 is a circuit diagram showing a fourth embodiment.

FIG. 6 is a waveform chart for explaining the above operation.

FIG. 7 is a circuit diagram showing a fifth embodiment.

FIG. 8 is a waveform chart for explaining the above operation.

FIG. 9 is a circuit diagram showing a sixth embodiment.

FIG. 10 is a circuit diagram showing a seventh embodiment.

FIG. 11 is a waveform chart for explaining the above operation.

FIG. 12 is an explanatory diagram for explaining the operation of the above.

FIG. 13 is an explanatory diagram for explaining a basic operation of the present invention.

FIG. 14 is a view showing lamp characteristics of a discharge lamp.

FIG. 15 is a circuit diagram showing a conventional example.

FIG. 16 is a diagram for explaining lamp characteristics of a discharge lamp.

[Explanation of symbols]

 3 Step-up chopper circuit 4 Inverter circuit 5 Load circuit 6 Discrimination correction circuit La Discharge lamp AC AC power supply

Claims (6)

[Claims] 1. A DC power supply for obtaining a DC output from an AC power supply, an inverter means for converting the DC output of the DC power supply to a high-frequency output to turn on a discharge lamp, and a plurality of lamps having substantially equal rated lamp currents and different rated lamp powers. Discriminating means for discriminating which of the types of discharge lamps is connected to the inverter means, and the high-frequency current output from the inverter means according to the result of the discrimination by the discriminating means, And a correcting means for correcting the load characteristics of the discharge lamp so as to be substantially equal to the rated lamp current suitable for the discharge lamp. 2. The inverter means is capable of supplying a rated lamp current to a type of discharge lamp having a maximum rated lamp power among a plurality of types of discharge lamps. 2. The discharge lamp lighting device according to claim 1, wherein when the power supply is connected, the load characteristic of the discharge lamp is corrected by changing an operation condition of the inverter means. 3. The apparatus according to claim 2, wherein the correction means corrects a load characteristic of the discharge lamp by changing a DC output of a DC power supply when another type of discharge lamp is connected.
The discharge lamp lighting device as described in the above. 4. The discharge lamp according to claim 2, wherein the correction means corrects a load characteristic of the discharge lamp by changing an oscillation frequency of the inverter means when another type of discharge lamp is connected. Lighting device. 5. An inverter means comprising: a pair of switching elements connected in series between output terminals of a DC power supply; a choke coil connected in series between both ends of at least one switching element via a DC cut capacitor; A series resonance circuit comprising a resonance capacitor to which a discharge lamp is connected between both ends, wherein the DC output voltage of the DC power supply is 2√2 of the maximum rated lamp voltage among the rated lamp voltages of a plurality of types of discharge lamps. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is set to be at least twice as large. 6. The discharge lamp according to claim 1, wherein the discharge lamp is a standardized discharge lamp dedicated to high-frequency lighting and a discharge lamp having a luminous efficiency of 850 lumens / watt or more. Lighting device.