JPH0878171A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE: To provide a discharge lamp lighting device which can perform a dimming control, and also reduce the noise terminal voltage. CONSTITUTION: A rectifier DB is connected in parallel to an AC power source AC through a higher harmonic preventing filter circuit 1, a booster chopper circuit 5 is connected to the output end of the rectifier DB, and a high frequency converting circuit 2b is connected to the output end of the booster chopper circuit 5. The control of a switching element Q1 is performed by detecting the dimming level of a discharge lamp La by a dimming level detecting circuit 9 to operate a switching means 8, thereby switching a control circuit X1 (PWM method) and a control circuit X2 (frequency fixing method). Thus, a discharge lamp lighting device which can perform dimming control and also reduce the noise terminal voltage can be provided.

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.

[0002]

2. Description of the Related Art As a conventional example of the present invention, JP-A-2-253
FIG. 7 shows a block configuration diagram thereof. In this conventional example, a DC component is superimposed on a high frequency component to light a discharge lamp La, and at the same time, a high frequency power source 2 is used.
The dimming control unit 3 controls the output voltage from the dimming control, and continuous dimming in a wide range is possible. A concrete block diagram of FIG. 7 is shown in FIG.

This circuit converts an AC power supply AC into a DC conversion circuit 2
The voltage is converted into a DC voltage by a, converted into a high frequency voltage by the high frequency conversion circuit 2b, and applied to both ends of the discharge lamp La through the resonance circuit 2c, and is applied to both filaments of the discharge lamp La through the preheating circuit 2d. Is applied. The high frequency voltage obtained from the high frequency conversion circuit 2b is converted into a DC voltage by a DC converter circuit 4a, Inpi - dancing element 4b and diode - is applied to both ends of the discharge lamp La via the de D _4C.

Further, there is a dimming control unit 3 or the like which is dimmed and lit by inputting a dimming signal Vd whose output can be controlled from the outside. An example of the circuit configuration is shown in FIG. An example of the circuit configuration of the optical signal converter 6 is shown in FIG.
Shown in This circuit has already been disclosed in Japanese Patent Application No. 5-9964 and realizes a discharge lamp lighting device capable of dimming and lighting two fluorescent lamps to a low luminous flux. The dimmer used in this example outputs a rectangular wave signal (dimming signal Vd) having a constant frequency and a variable duty.
The 1-optical signal conversion unit 6 of 0 converts the dimming signal Vd into the DC voltage V _out1 . By continuously changing the duty of the dimming signal Vd, the DC voltage V _out1 changes continuously, and the discharge lamp L is changed according to the value of this DC voltage V _out1.
It is configured so that a can be continuously dimmed.

Various proposals have been made for one of the components of the DC conversion circuit 2a, for example, the step-up chopper circuit 5 in FIGS. 7 to 9, and an example thereof is shown in FIG. Example), the conceptual circuit diagram of FIG. 11 is shown in FIG.
Shown in

FIG. 11 shows a high frequency conversion circuit (for example, an inverter).
A load composed of a discharge circuit La and the like.
It supplies electric power to Z. AC power supply AC harmonics
Rectifier DB is connected in parallel through the prevention filter circuit 1.
Then, the inductance element L is connected to the output terminal of the rectifier DB.₁， Su
Itching element Q₁, Diode D₁, Capacitor C ₁
Is connected to the boost chopper circuit 5. Rise
A resistor R is provided at the output end of the pressure chopper circuit 5.₁, Resistance R₂， Con
Densa C₂Output voltage detection circuit B and load Z
And are connected in parallel.

The switching element Q ₁ is controlled by a control IC
(E.g. Sha - flop Co. IR3MO2) and a resistor R ₉ ~ resistor R _14, a capacitor C _4, performed in configured control circuit Xa, etc. capacitor C _5. The control circuit Xa receives the detection output (divided voltage of the resistors R ₁ and R ₂ ) of the DC power superimposing means 4 and the duty of the switching element Q _{1 so that} the voltage V ₀ across the load Z becomes constant. Control the tee ratio. The control power supply circuit 7 of the control circuit Xa including the diode D ₂ , the resistor R ₃ , and the capacitor C ₃ is connected between one end of the AC power supply AC and the negative terminal of the rectifier DB, and the control is performed. The power supply circuit 7 obtains the power supply V ₁ of the control circuit Xa.
Here, the operating frequency of the switching element Q ₁ is determined by the values of the resistor R ₉ and the capacitor C ₄ and becomes constant. (Frequency fixing method) In the circuit shown in FIG. 11, the waveform of the current flowing through the inductance element L ₁ is shown in FIG.
_The voltage waveform applied to ₁ is shown in FIG. Time t
_{When the} switching element Q ₁ is turned on at ₁ , the current flowing through the inductance element L ₁ gradually increases, and at time t
_{When the} switching element Q ₁ is turned off at ₂ , the energy accumulated in the inductance element L ₁ is released thereafter, so that the current gradually decreases. When the current of the inductance element L ₁ becomes zero at time t ₃ , the switching element Q ₁ and the diode D ₁ are turned on as shown by the broken line in FIG.
The electric current stored in the stray capacitances C ₆ and C ₇ causes a reverse current to flow in the inductance element L ₁ and the rectifier DB
LC resonance occurs through the capacitor C ₅ of.

Here, if the current quiescent period from time t _{3 to} t ₄ is long, an input current with many harmonic components can be obtained. That is, the input voltage is the case of a sine wave, peak input voltage - such current idle period time t ₃ ~t ₄ in the vicinity of click value is shortened, the time t ₃ ~t ₄ at lower section of the input voltage to the opposite Since such a current quiescent period becomes long, there is a problem that the input current is large in the vicinity of the peak value of the input voltage and the input current is small in the low input voltage section as shown in FIG.

Here, as the DC converter circuit 2a, a boost chopper circuit is used to increase the power factor of the input current, reduce harmonic components, and supply a DC smoothing voltage that is as flat as possible. Yes, and its circuit diagram is shown in FIG. (Second Conventional Example) This circuit makes the operating frequency of the switching element Q ₁ variable and also serves as a drive circuit for the switching element Q ₁ as a general-purpose IC for a switching regulator (for example, a motor controller).
With La Inc. MC34261), in which turns on the switching element Q ₁ by detecting the current that no flowing to the inductance element L _1. (PWM method) The operation principle of this circuit will be described below. Resistance input voltage R _1, resistor detected by the partial pressure V ₂ of R _2, further resistor R _1, the partial pressure V ₂ by the smoothing capacitor C ₁ of the resistor R ₂
Of the error amplifier 2 by detecting the voltage V ₀ (= output voltage) across
By inputting it to the inverting input terminal of No. 1 and multiplying the divided voltage V ₂ and the output V ₃ of the error amplifier 21 by the multiplier 22, the target waveform value of the peak value of the current flowing in the switching element Q ₁ is obtained. I have decided. Then, the current flowing through the switching element Q ₁ is detected by the resistor R ₂₅ . Accordingly, peak of the current flowing through the switching element Q ₁ - when the same current as the target waveform value of click value flows through the switching element Q _1, the ON period of the switching element Q ₁ is determined by turning off the switching element Q ₁ It By controlling in this way, the peak value of the current flowing through the switching element Q ₁ becomes a point on the same sine wave as the input current waveform, and the output voltage V ₀ can be made substantially constant. Incidentally, by the timing of turning on the switching element Q ₁ is for detecting the secondary winding inductance element voltage e ₂ of L ₂ the inductance element L _1, the general-purpose IC when the current has disappeared flowing to the inductance element L ₁ (MC34261 ), The synchronizing signal is input to turn on the switching element Q ₁ .

As means for detecting an abnormal state of the discharge lamp La, a method of detecting the voltage and current of the discharge lamp and comparing them with a predetermined reference level, and a method of comparing the voltage and current of the two discharge lamps, respectively. And a method of comparing with a predetermined reference level. Further, as means for detecting the abnormal state of the discharge lamp La and protecting the discharge lamp lighting device, a method of stopping the multiplier 22 and a method of limiting the output of the discharge lamp lighting device at a level at which the device is not destroyed, There is a method of repeating detection → extinguishing → starting → detection.

[0011]

However, when the dimming control is performed by using the circuit shown in FIG. 15 as the DC conversion circuit 2a, the switching is performed because the difference in the input current value between the full lighting and the dimming lighting is large. The change width of the operating frequency of the element Q ₁ becomes extremely large. When the change width of the operating frequency of the switching element Q ₁ becomes very large, it becomes difficult to block the harmonic component in the filter circuit 1, and the noise terminal voltage increases. Further, there is a first problem that switching loss increases as the operating frequency increases.

Further, the above-mentioned means for detecting the abnormal state of the discharge lamp La cannot turn on the dimming control when the discharge lamp is in an abnormal state because the discharge lamp La is turned on or is turned on with a constant output. There is a second problem.

The present invention has been made in view of the above problems, and an object of the present invention is to perform dimming control, reduce the noise terminal voltage, and dimming control even in an abnormal state. It is to provide a discharge lamp lighting device capable of performing the above.

[0014]

In order to solve the above-mentioned problems, according to the present invention, a discharge lamp and a DC power source are boosted, and at least an inductance element, a switching element and a diode are used. And boost chopper circuit,
A switching element in a discharge lamp lighting device, comprising: a high frequency converter capable of converting a DC voltage boosted by a boost chopper circuit into an AC high frequency voltage and supplying the AC high frequency voltage to the discharge lamp, and varying the power supplied to the discharge lamp. The first control means capable of varying the operating frequency, the second control means for keeping the operating frequency of the switching element constant, and the connection between the first control means and the second control means and the switching element,
It is characterized in that a switching means for switching between when the output power of the discharge lamp is larger than a predetermined value and when it is smaller than the predetermined value is provided.

According to the second aspect of the present invention, an abnormality detecting section for detecting an abnormal state of the discharge lamp is provided, and the output of the high frequency converter is equal to or less than the upper limit value set for protecting the discharge lamp lighting device when an abnormality occurs. It is characterized by controlling the dimming by.

According to a third aspect of the invention, the operating frequency of the switching element is within the range of 20 kHz to 50 kHz.

According to the invention described in claim 4, the second control means is capable of varying the operating frequency of the switching element.

[0018]

According to the first and third aspects of the present invention, when the output value of the high frequency conversion device is smaller than the predetermined value by detecting the output value of the high frequency conversion device and operating the switching means, The switching element Q ₁ is controlled by the first control circuit.
Is controlled in the range of 20 kHz to 50 kHz, and when the output value of the high frequency converter exceeds a predetermined value, the second control circuit controls the switching element Q ₁ at 50 kHz, for example.

Alternatively, when the output value of the high frequency converter is larger than the predetermined value, the first control circuit controls the switching element switching element Q ₁ in the range of 20 kHz to 50 kHz, and the output value of the high frequency converter is increased. When it becomes smaller than the predetermined value, the second control circuit controls the switching element Q ₁ at, for example, 50 kHz.

According to the invention of claim 2, the discharge lamp La
The abnormal state is detected by the abnormality detection unit, the detected information is received, and the output of the high-frequency converter is changed only when the value is below a certain value that can protect the device. The output of the high frequency converter is changed within the range including the above.

According to the invention described in claim 4, by detecting the output value of the high frequency converter and operating the switching means, it is possible to detect whether the output value of the high frequency converter is smaller or larger than a predetermined value. The switching element Q ₁ is controlled by switching between the first control circuit and the second control circuit.

[0022]

【Example】

(Embodiment 1) A circuit diagram of a first embodiment according to the present invention is shown in FIG.

A difference from the circuits shown in FIGS. 11 and 15 is that a control circuit X ₁ (PWM system) which operates in the same manner as the control circuit Xb shown in FIG. 15 in order to control the switching element Q ₁ is provided. , A control circuit X ₂ which performs the same operation as the control circuit Xa shown in FIG. 11 (fixed frequency system), a switching means 8 which switches between the control circuit X ₁ and the control circuit X _2, and a lamp current flowing through the discharge lamp La. Is provided to detect the dimming level of the discharge lamp La and to input the dimming level to the switching means 8.
1, the same configurations as those of the circuit shown in FIG. 15 are denoted by the same reference numerals and the description thereof will be omitted.

Next, the operation will be briefly described. Dimming level
The dimming level of the discharge lamp La detected by the detection circuit 9 is
When it is larger than the constant value A, the switching means 8 is switched to switch the switch.
Itching element Q₁Control circuit X at the gate of₁Connect
Switching element Q₁Performs PWM operation. In this case
Switching element Q₁Is, for example, between 20 and 50 kHz
Set the dimming level value A so that Dimming
Dimming level of the discharge lamp La detected by the bell detection circuit 9
Is smaller than the predetermined value A, the switching means 8 is switched.
Switching element Q ₁Control circuit X at the gate of₂Connect
Switching element Q₁Operates at a fixed frequency. This
Switching element Q in case of₁Is 50 kHz (one
Fixed).

The noise terminal voltage has a frequency of 0,15 MH.
Although it is specified above z, the third harmonic has a great influence on noise. Therefore, if the switching element Q ₁ is operated at 50 kHz or less, the third harmonic is generated at a frequency of 0.15 MHz or less. Therefore, the noise terminal voltage can be suppressed low. Further, when the operating frequency of the switching element Q ₁ is set to 20 kHz or less, it becomes an audible frequency band. Therefore, the operating frequency of the switching element Q ₁ is preferably 20 kHz or more. Therefore, it is desirable to operate the switching element Q ₁ in the range of 20 to 50 kHz.

(Second Embodiment) A circuit diagram of a second embodiment according to the present invention is shown in FIG.

The difference from the circuit of the first embodiment shown in FIG. 1 is that instead of connecting the dimming level detection circuit 9 to the output end of the dimming control unit 3 to detect the dimming level of the discharge lamp La. The dimming signal Vd is detected and the switching means 8 is switched, and the same configurations as those of the other first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

The present embodiment utilizes that the dimming level of the discharge lamp La is determined by the dimming signal Vd. For example, even if the duty ratio of the dimming signal Vd is detected,
A signal obtained by converting the dimming signal Vd into a DC voltage may be detected.

In the above-mentioned first and second embodiments, by adopting the above-mentioned constitution, the switching element Q ₁ is always operated within a predetermined frequency range at any dimming level, and what kind of adjustment is performed. It is possible to suppress the noise terminal voltage even at the light level.

The control circuit X₂The operating frequency of the control
Road X₁Any value may be used as long as it is within the operating frequency range. Well
Control circuit X₁, Control circuit X₂Both are shown in FIG.
It operates in the same way as the control circuit Xb (PWM system).
Good, in that case, the control circuit X ₁, Control circuit X₂Together
Switching element Q₁Operating frequency is 20 to 50 kHz
A range of z is desirable.

(Third Embodiment) FIG. 3 shows a circuit diagram of a third embodiment according to the present invention.

The present circuit includes, for example, a power converter 10 including a filter circuit 1, a rectifier DB, a dimming controller 3, and a DC converter 2a as shown in the circuit of FIG. 1, and an output of the power converter 10. The discharge lamp La connected to the end and the discharge lamp L
an abnormality detection unit 11 that detects an abnormality in the discharge lamp La connected in parallel with a, a no-load detection circuit 12 that detects the no-load state of the discharge lamp La and transmits the abnormality to the abnormality detection unit 11, and a dimming control unit 3 And a dimming signal converter 6,
As shown in FIG. 4, during normal lighting, the output of the power conversion device 10 changes according to the change of the dimming signal Vd, and during abnormal conditions such as the end of life of the discharge lamp La, there is output of the power conversion device 10. The output of the power conversion device 10 is increased or decreased to a certain level or decreased according to the change of the dimming signal Vd so that the value does not exceed the value, and the dimming operation is performed again when the abnormal state is released.

FIG. 5 shows a specific circuit example of the abnormality detecting section 11. The abnormality detection unit 11 detects the voltage across the discharge lamp La and compares it with a predetermined reference level to determine the discharge lamp La.
Lamp abnormality detection circuit 13 for detecting the abnormality of the lamp, the flip-flop 14, and the flip-flop 1 when the dimming signal Vd reaches a level at which the device is not destroyed even when the lamp is abnormal.
4 and at least a dimming signal determining circuit 15 for resetting.

The lamp abnormality detecting circuit 13 rectifies and smoothes the voltage V _La across the lamp divided by the resistors R ₃₁ and R ₃₂ with the diode D ₃₁ and the capacitor C ₃₁ to obtain the DC voltage V ₃₁ . The comparator CO compares the DC voltage V ₃₁ with a predetermined reference voltage V _{32.
1 is} for comparative output.

When the voltage V _La across the lamp rises and the DC voltage V ₃₁ becomes larger than the reference voltage V ₃₂ during an abnormal state such as the end of life of the discharge lamp La, the comparator CO ₁ causes the flip-flop 14 to go high (H). ) Level signal, and the flip-flop 14 outputs H level. This signal is input to the dimming signal conversion unit 6 from the terminal of the abnormality detection unit 11. Then, receiving the signal sent from the dimming signal converter 6 to the dimming controller 3, the dimming controller 3 limits the output of the power conversion device 10 to protect the circuit. When the output of the power conversion device 10 decreases, the lamp abnormality detection circuit 13 stops detecting an abnormality, but unless the flip-flop 14 is reset, the abnormality detection unit 11 continues to output an H level signal from the terminal.

The dimming signal control circuit 15 inputs the dimming signal Vd converted into the DC voltage by the dimming signal converting unit 6 from the terminal of the abnormality detecting unit 11, and controls the dimming signal Vd and the predetermined voltage V.
₃₃ is output by comparison with the comparator CO ₂ , and the flip-flop 14 is reset when the dimming signal Vd reaches a level at which the circuit is not destroyed even when the discharge lamp La is abnormal.

Further, the no-load detecting circuit 12 inputs a signal from the terminal to the abnormality detecting section 11 when the no-load state occurs,
The flip-flop 14 is reset. When the discharge lamp La in an abnormal state is replaced with a normal discharge lamp La while the power is turned on, a signal is input from the no-load detection circuit 12 to the abnormality detection unit 11, and the abnormality detection unit 11 outputs a low voltage (L) from the terminal. ) Output a level signal. This signal is input to the dimming signal conversion unit 6 from the terminal of the abnormality detection unit 11. Then, receiving the signal sent from the dimming signal conversion unit 6 to the dimming control unit 3, the dimming control unit 3 limits the output of the power conversion device 10 and returns the upper limit of dimming to the original state.

A high voltage is applied to both ends of the discharge lamp La when the discharge lamp La is started. In that case, the power converter 1
A signal is input to the terminal of the abnormality detecting unit 11 from 0, and the operation of the abnormality detecting unit 11 is stopped from the power-on to the lighting of the discharge lamp La so that the abnormality is not detected, that is, the malfunction is prevented. With this function, it is possible to prevent a malfunction caused by turning the power supply on and off after the detection of Emiles.

Next, an example of a concrete circuit of the dimming signal converter 6 is shown in FIG. This circuit includes a comparator C to which a dimming signal Vd is input via a resistor R ₆₁ , a rectifier DB ₂ , and a photocoupler PC.
O ₆₁ , comparator CO ₆₂ , resistors R ₆₂ to R ₆₉ , switching elements Q ₆₁ to switching element Q ₆₄ , capacitors C ₆₁ and C ₆₂ , and reference voltages V ₆₁ and V _62. .

The operation will be briefly described below. Since the L level dimming signal Vd is input to the terminal during normal lighting, the switching element Q ₆₂ and the switching element Q ₆₃ are turned off, and the input dimming signal Vd is the resistor R ₆₁ and the rectifier DB.
₂ , input to the comparator CO ₆₁ via the photocoupler PC and compared with the reference voltage V ₆₁ . When the dimming signal Vd is at the H level, the output of the comparator CO ₆₁ is also at the H level, so the switching element Q ₆₁ is turned on and the capacitor C ₆₁ is charged from the DC power supply V _CC via the resistor R ₆₆ . The electric charge is discharged, and the output voltage V _out1 becomes L level. On the contrary, when the dimming signal Vd is at the L level, the output of the comparator CO ₆₁ is also at the L level, the switching element Q ₆₁ is turned off, and the capacitor C ₆₁ is charged from the DC power source V _CC via the resistor R _66. As a result, the output voltage V _out1 becomes H level. Dimming signal Vd
Is a rectangular wave signal of about 1 kHz, the charging / discharging operation of the capacitor C ₆₁ is repeated at high speed, and the output voltage V
_out1 can be regarded as a substantially DC voltage.

When the discharge lamp La is in an abnormal state, since the H-level dimming signal Vd is input to the round terminal, the switching elements Q ₆₂ and Q ₆₃ are turned on. The switching element Q ₆₁ is turned off. The output voltage V _out1 becomes a voltage obtained by dividing the DC power supply V _CC by the resistors R ₆₆ and R ₆₅ , and is always constant. In this case, it is desirable that the voltage division ratio between the resistance R ₆₆ and the resistance R ₆₅ is set so that the device is not destroyed when the discharge lamp La is in an abnormal state.

Further, the switching element Q₆₄Normally lights
Switch for normal lighting, even when the discharge lamp La is in an abnormal state
Element Q₆₁Performs the same operation as the
Pressure V _out2Can be obtained. Output voltage V_out2Is the terminal
Then, the light is input to the dimming signal control circuit 15.

The abnormality detecting section 11 is not limited to the configuration shown in FIG. 5 as long as it outputs an H level signal when there is no load.

[0044]

According to the first, third and fourth aspects of the present invention, it is possible to provide the discharge lamp lighting device capable of performing the dimming control and reducing the noise terminal voltage.

According to the second aspect of the present invention, it is possible to provide a discharge lamp lighting device capable of dimming control even in an abnormal state.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment according to the present invention.

FIG. 2 is a circuit diagram showing a second embodiment according to the present invention.

FIG. 3 is a circuit diagram showing a third embodiment according to the present invention.

FIG. 4 is a diagram showing a relationship between an output supplied to the discharge lamp and a dimming level according to the above-described embodiment, in (a) normal lighting and (b) abnormal state.

FIG. 5 is a diagram showing an example of a specific circuit of an abnormality detection unit according to the above embodiment.

FIG. 6 is a diagram showing a specific circuit example of a dimming signal conversion unit according to the above embodiment.

FIG. 7 is a block diagram showing an example of a discharge lamp lighting device capable of dimming the discharge lamp over a wide range.

FIG. 8 is a block configuration diagram showing a specific example of the discharge lamp lighting device.

FIG. 9 is a block configuration diagram showing another example of a discharge lamp lighting device capable of dimming a discharge lamp over a wide range.

FIG. 10 is a circuit diagram showing a specific example of a dimming signal conversion unit in the discharge lamp lighting device.

FIG. 11 is a circuit diagram showing a first conventional example according to the present invention.

FIG. 12 is an operation waveform diagram according to the conventional example.

FIG. 13 is a circuit diagram showing one operation state according to the conventional example.

FIG. 14 is a waveform diagram showing an input voltage waveform and an input current waveform according to the conventional example.

FIG. 15 is a circuit diagram showing a second conventional example according to the present invention.

[Explanation of symbols]

 2b High-frequency converter 5 Boost chopper circuit 8 Switching means 11 Abnormality detection unit La Discharge lamp Q Switching element X Control circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication H05B 41/392 G 6908-3K (72) Inventor Tokushi Yamauchi 1048 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works Stock company

Claims (4)

[Claims] 1. A discharge lamp and a DC power supply for boosting pressure, at least an inductance element, a switching element, and a diode.
And a high-frequency converter capable of converting the DC voltage boosted by the boost chopper circuit into an AC high-frequency voltage and supplying the AC high-frequency voltage to the discharge lamp, and varying the power supplied to the discharge lamp. In a discharge lamp lighting device comprising: a first control means capable of varying the operating frequency of the switching element, a second control means for keeping the operating frequency of the switching element constant, the first control means, and Discharge lamp lighting, characterized in that switching means is provided for switching the connection between the second control means and the switching element depending on whether the output power of the discharge lamp is larger or smaller than a predetermined value. apparatus. 2. An abnormality detection unit for detecting an abnormal state of the discharge lamp is provided, and when an abnormality occurs, the output of the high frequency converter is dimming controlled below an upper limit value set for protecting the discharge lamp lighting device. The discharge lamp lighting device according to claim 1. 3. The operating frequency of the switching element is set to 2
The discharge lamp lighting device according to claim 1 or 2, wherein the discharge lamp lighting device is in a range of 0 kHz to 50 kHz. 4. The discharge lamp lighting device according to claim 1, wherein the second control means is capable of varying the operating frequency of the switching element.