KR100267265B1 - Apparatus lighting discharge lamp for drive internal combustion engine - Google Patents

Abstract

Disclosed is an internal combustion engine driven discharge lamp lighting apparatus capable of lighting a discharge lamp without using a ballast composed of a magnetic leakage transformer. A generator driven by an internal combustion engine, the output characteristic of which exhibits a drooping characteristic, is provided, and a voltage is applied to the discharge lamp without placing the output voltage of the generator between the ballasts. The output voltage is higher than the discharge start voltage of the discharge lamp when there is no load of the generator, and the short circuit current of the generator has a magnitude necessary to limit the discharge current immediately after the discharge start of the discharge lamp is below the allowable value, The output characteristics of the generator are set so that the terminal voltage and the discharge current are within the rated range.

Description

Internal combustion engine driven discharge lamp lighting device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting apparatus used for lighting a discharge lamp such as a mercury lamp or a metal halide lamp.

As a lighting device for lighting a lighting device used in a construction site, a lighting device for laser, a lighting device for disaster prevention, or the like, a power source using a synchronous generator driven by an internal combustion engine is used.

In recent years, as lighting fixtures for construction sites and lighting fixtures for lasers, many discharge lamps such as mercury lamps have been used instead of incandescent lamps. As is well known, the discharge lamp has a negative impedance characteristic, and once discharge starts, the impedance decreases with the increase of the discharge current. Therefore, if the discharge current is not limited, the discharge current increases indefinitely, and thus the discharge lamp has a negative impedance. Destroyed. Therefore, when the discharge lamp is turned on, a ballast for limiting the discharge current to an appropriate range is required.

Conventional discharge lamp lighting devices driven by an internal combustion engine include a synchronous generator driven by an internal combustion engine to generate an AC voltage, and an automatic voltage regulator for controlling the output voltage of the generator to be maintained at a set value. regulators, a speed controller for controlling the rotational speed of the internal combustion engine, and a ballast for limiting the current flowing from the generator to the discharge lamp, and the automatic voltage regulator provides an output voltage of 100 [V]. At the same time, the rotation speed of the internal combustion engine is controlled by the speed controller so as to maintain the output frequency of the generator at a commercial frequency of 50 Hz or 60 Hz.

The ballast consists of a leakage transformer formed by winding a primary coil and a secondary coil around an iron core having a gap in a magnetic path, and the output of the generator is applied to the primary coil of the transformer. Discharge lamps are connected to both ends of the secondary coil of the transformer.

In many cases, a phase advancing capacitor for power factor compensation is connected at both ends of the secondary coil of the magnetic leakage transformer.

The magnetic leakage transformer has a constant value for the discharge current of the discharge lamp, so that the output voltage vs. the output current characteristics have a dropping characteristic (a characteristic in which the output voltage rapidly decreases as the output current increases, thereby limiting the output current to a predetermined value or less). The following functions.

The discharge lamp lighting apparatus using a ballast composed of a magnetic leakage transformer is disclosed in Japanese Unexamined Patent Application Publication No. 55-27194, Japanese Unexamined Patent Application Publication No. 57-17513, and Japanese Unexamined Patent Application Publication No. 5-87958.

As described above, as the conventional internal combustion engine driven discharge lamp lighting apparatus needs to provide a ballast between the generator and the discharge lamp, it is inevitable that the cost is high.

In addition, the ballast has a low power factor as an inductive load, and when the ballast is installed, such a burden is placed on the generator.

In addition, when the forward capacitor is installed in the ballast to improve the power factor, the output current of the generator is increased because the leading current flows to increase the magnetic flux flowing through the generator's magnetic core when the discharge lamp is turned off and then turned on again. It rose excessively, which was not preferable.

In addition, when the ballast is installed, a large inrush current of about 1.5 times the rated input current flows through the armature coil of the generator at start-up, and when the rated output current of the generator is combined with the rated current of the discharge lamp, the generator is overloaded during start-up. As a result, the voltage fluctuation rate increases, which may hinder the lighting. In order to cause the discharge lamp to be lit without interruption, it is necessary to suppress the voltage fluctuation rate of the generator within ± 5 to 6%. Therefore, it is necessary to use a large-capacity one having a rated current of 2 to 3 times the rated current of a discharge lamp as a generator, and the cost is inevitable.

In particular, when a plurality of discharge lamps are turned on at the same time, it is necessary to use a remarkably large capacity as a generator and an internal combustion engine for driving the generator, and it is inevitable that the cost is high.

It is also conceivable that the output of the internal combustion engine and the power capacity of the generator are set equal to the total of the rated power consumption of the plurality of discharge lamps so as to light the plurality of discharge lamps sequentially, but in this case, the number of the discharged lamps increases. In this way, the output of the generator can not be afforded, the generator is overloaded when starting the discharge lamp to be lit from the back, which has hindered the start of the discharge lamp. For example, in the case where four discharge lamps are turned on, when the three discharge lamps are sequentially turned on, and the last discharge lamp is to be turned on, the generator becomes overloaded by the starting current and is applied to the last discharge lamp. The voltage fluctuations became large, and the lighting of the last discharge lamp failed.

An object of the present invention is to make it possible to omit a ballast composed of a magnetic leakage transformer in the case of turning on a discharge lamp as a power source using a generator driven by an internal combustion engine.

Another object of the present invention is to provide an internal combustion engine driven discharge lamp lighting apparatus capable of lighting a plurality of discharge lamps without using a ballast.

It is still another object of the present invention to provide an internal combustion engine driven discharge lamp lighting apparatus which enables the rated capacity of a generator to be smaller than that of the conventional one, and to reduce the size and reduce the cost.

According to the present invention, there is provided a discharge lamp lighting apparatus driven by an internal combustion engine. The discharge lamp lighting device according to the present invention provides for a generator driven by an internal combustion engine, and the output voltage of the generator is applied to the discharge lamp without interposing a ballast.

The generator is configured such that the output voltage versus output current characteristics (output characteristics) exhibit a drooping characteristic, and the output characteristics are set to satisfy the following conditions. That is, the output voltage at no load of the generator is higher than the discharge start voltage of the discharge lamp, and the short circuit current of the generator has a magnitude necessary to limit the discharge current immediately after the discharge start of the discharge lamp is below the allowable value, The output characteristics of the generator are set so that the terminal voltage and the discharge current are kept in the rated range.

When lighting a discharge lamp that requires a high discharge start voltage at start-up, such as a metal halide lamp, a starter circuit for generating a high voltage pulse at the start of the discharge lamp as a power source is provided. It is desirable to have a configuration in which the output pulse of the circuit is applied to the discharge lamp simultaneously with the output voltage of the generator. Here, the output voltage at no load of the generator is set to have a size necessary to make the maximum value of the high voltage pulse higher than the discharge start voltage of the discharge lamp.

According to the present invention, there is also provided a lighting device suitable for lighting a plurality of discharge lamps. When lighting a plurality of discharge lamps, a generator is provided for a stator having a multipole rotor driven by an internal combustion engine and a plurality of discharge lamp lighting coils electrically independent of each other. Thus, the output voltages of the power generation coils for turning on a plurality of discharge lamps of the generator are supplied to separate discharge lamps, respectively. In this case, the stator of the generator is loosely coupled to the magnetic circuits of the power coils for discharging the plurality of discharge lamps in order to suppress the armature reaction caused by the power coils for the discharge lamp lighting. To install the means. In this case, the output characteristics of the power generation coils for lighting each discharge lamp exhibit dropping characteristics, and the output voltage at no load of the power generation coils for each lighting lamp is higher than the discharge starting voltage of the discharge lights, and the short circuit current of the power generation coils for lighting each discharge lamp is discharged. It is necessary to limit the discharge current just after the start of discharge to below the allowable value, and also to ensure that the terminal voltage and discharge current of the discharge lamp in the normal (thermally stable state) are maintained in the rated range of the discharge lamp. Set the output characteristics of the power generating coil.

1 is a configuration diagram showing an overall configuration of an embodiment of the present invention.

2 is a configuration diagram showing the overall configuration of another embodiment of the present invention.

3 is a configuration diagram showing an overall configuration of still another embodiment of the present invention.

FIG. 4 is a circuit diagram showing an example of the configuration of the starting circuit portion in the embodiment of FIG.

5 is a configuration diagram showing a specific example of a generator suitable for use in the present invention.

6 is a diagram showing one example of the characteristics of the magnet generator.

Fig. 7 is a diagram showing one example of output characteristics of a generator suitable for use in the present invention, terminal voltage versus current characteristics when the discharge lamp is cold, and output characteristics of a generator used in a conventional lighting device.

8 is a configuration diagram showing the overall configuration of the present invention when the plurality of discharge lamps are turned on.

9 is a configuration diagram showing an overall configuration of another embodiment of the present invention when the plurality of discharge lamps are turned on.

10 is a configuration diagram showing the overall configuration of still another embodiment of the present invention when the plurality of discharge lamps are turned on.

11 is a configuration diagram showing a specific example of a generator used when lighting a plurality of discharge lamps in the lighting device of the present invention.

12 is an exploded view of an important part of the stator side of the generator of FIG.

FIG. 13 is a configuration diagram showing another configuration example of a generator used when lighting a plurality of discharge lamps in the lighting device of the present invention. FIG.

FIG. 14 is a diagram showing the voltage vs. current characteristics when the output voltage vs. output current characteristics, the output voltage vs. output power characteristics, the output voltage vs. input characteristics, and the discharge lamp of the generator shown in FIG. 11 are cold.

1 shows the overall configuration of Embodiment 1 of the present invention, in which 10 is an internal combustion engine, 11 is a generator driven by the internal combustion engine 10, and 12 is a discharge lamp such as a mercury lamp. to be. The voltages obtained between the output terminals 11a and 11b of the generator 11 are directly applied to both ends of the discharge lamp 12. The generator ll may be a direct current generator or an alternator.

2 shows the configuration of Embodiment 2 of the present invention. In this embodiment, the generator 11 is made of an alternator. The output voltage of the generator 11 is input to the rectifier 13, and a DC voltage obtained between the output terminals 13a and 13b of the rectifier 13 is applied to both ends of the discharge lamp 12 such as a mercury lamp.

The discharge lamp lighting apparatus according to the present invention uses the generator 11 having a suitable output voltage vs. output current characteristic to light the discharge lamp, so that the generator is not provided with a ballast as shown in FIG. 1. The output voltage of (11) is applied to the discharge lamp directly, or as shown in FIG. 2, the output voltage of the generator 11 is applied to the discharge lamp through the rectifier 13, characterized in that the configuration do.

The generator used in the present invention is configured such that the output voltage vs. output current characteristic exhibits a drooping characteristic, and the output voltage vs. output current characteristic of the generator is set as follows. That is, the output voltage at no load of the generator is higher than the discharge start voltage of the discharge lamp, and the size of the discharge current immediately after the discharge start such as the short-circuit current discharge of the generator is limited to below the allowable value. In order to keep the voltage and discharge current within the rated range, the output voltage characteristics of the generator versus the output current are set.

One example of the characteristics of the output voltage E versus the output current I of the generator 11 suitable for use in the present invention is shown in the curve 1 of FIG. Curve 2 of Fig. 7 shows the voltage versus current characteristics when the mercury lamp is cold. As shown in this curve 2, the discharge lamp has a negative impedance characteristic in which the terminal voltage decreases as the discharge current increases.

The voltage E _{A at the} point A of the curve 2 in FIG. 7 is the discharge start voltage. In order to turn on a discharge lamp, it is necessary to apply a voltage more than the voltage E _A of this point _A to both ends of a discharge lamp. Therefore, in the present invention, the no-load voltage E _a (voltage at point a in FIG. 7) of the generator is set higher than the discharge start voltage E _A.

When the discharge lamp starts to discharge, its impedance rapidly decreases, and the discharge current increases to point B that intersects with the output characteristic curve 1 of the generator. The discharge current at this point B becomes the discharge current when it is cold immediately after the start of discharge. The discharge current immediately after the discharge starts is determined by the short circuit current of the generator, and the larger the short circuit current is, the larger the value is. Thus, in the present invention, the output characteristics of the generator, that is, the output voltage versus output current characteristics are set as the drooping characteristics, so that the discharge current (current at point B in Fig. 7) immediately after the discharge is started to be limited to the size that is acceptable for the discharge lamp, The magnitude of the short circuit current (current at point c in Fig. 7) Ic is set.

Since the internal impedance increases as the temperature of the discharge lamp increases, the discharge current decreases, and when the discharge lamp is in a thermal stable state (steady state), the intersection of the impedance curve of the discharge lamp and the output characteristic curve of the generator at that time Stable at In the present invention, the generator so that the voltage and the discharge current (for example, the discharge current at point b in FIG. 7) at both ends of the discharge lamp in the steady state (when the discharge lamp is in a thermally stable state) fall within the rated range of the discharge lamp. Set the output characteristics.

That is, in the present invention, in the example of Fig. 7, the characteristics of the generator are set such that the output characteristic curve 1 passes a point, b point, and c point. By setting the characteristics of the generator in this manner, it is possible to start the discharge of the discharge lamp without using a ballast, to limit the discharge current immediately after the start of discharge to below the allowable value, and to ensure a stable operating point in normal operation.

The internal combustion engine 10 may be controlled to maintain the rotational speed of the generator 11 at a substantially rated rotational speed. In the conventional discharge lamp lighting device, the rotation speed of the internal combustion engine 10 is controlled so as to maintain the output frequency of the generator at a commercial frequency of 50 [kHz] or 60 [kHz]. Since it is preferable to have the output characteristics as described above, it is not necessary to control the rotational speed of the internal combustion engine so as to maintain the output frequency of the generator at a commercial frequency, and the rotational speed of the generator is a good value suitable for obtaining the above output characteristics. It is good to control the rotational speed of the internal combustion period (內燃 期間) to maintain.

The generator used in the conventional discharge lamp lighting device is controlled such that the output voltage E is maintained at a constant value E ₀ with respect to the output current I, as shown by the straight line 3 of FIG. Since point a, point b, and point c do not exist, it is necessary to provide a ballast between the generator and the discharge lamp in order to light the discharge lamp using the generator.

On the other hand, if the output characteristics of the generator are set as in the present invention, the output of the generator is configured to apply a voltage to the discharge lamp directly or through a rectifier, so that the operating points a, b and c necessary for lighting the discharge lamp are set. Since it can obtain, a discharge lamp can be turned on without using a ballast.

As described above, if the output of the generator is passed directly or through a rectifier and voltage is applied to the discharge lamp without using a ballast, the power factor of the load of the generator can be improved. Engine fuel consumption can be saved. In addition, since there is no need to install the phase advance capacitor, when the discharge lamp is turned off and then turned on again, the increase in magnetism of the generator due to the phase advance current occurs and the output voltage does not increase excessively.

Furthermore, if the ballast is omitted as described above, large inrush current can be prevented from flowing to the armature coil during start-up, so that a large lamp load can be driven conventionally using a generator of the same capacity, If the lamp load is the same, the generator can be miniaturized.

The drooping characteristic as shown by the curve 1 of FIG. 7 sets the number of turns of the armature coil of the generator 11 appropriately, and the leakage magnetic flux flowing through the adjacent magnetic poles when the magnetic poles of the rotor and the magnetic poles of the stator face each other. By adjusting the extremely high angles of the magnetic poles of the rotor and the stator so as to increase the size, it can be easily obtained. In particular, when a magnetic alternator is used as the generator 11, the number of turns of the electric coil is adjusted, and when the stator and the rotor magnetic poles face each other, the leakage magnetic flux flowing through the adjacent magnetic pole is increased. By adjusting the extreme height of, the drooping characteristic passing through points a, b and c of FIG. 7 can be easily obtained.

5 shows an example of the configuration of a magnetic alternator, which is composed of a stator 22 and a magnet rotor 25. The stator 22 has a molded iron core 20 having a structure in which a plurality of teeth (T12) to (T12) are penetrated from the annular yoke 20a and the iron core 20 It is made of an armature coil 21 wound around the tooth. The magnet rotor 25 is composed of a fly wheel 23 formed in a cup shape and a permanent magnet 24 fixed to the inner circumference of the circumferential wall portion 23a of the fly wheel 23. The magnet 24 is magnetized to a predetermined number of poles (12 poles in the example of illustration), and the magnets 24 constitute the rotor magnetic poles M1 to M12. The boss 23b is provided in the center of the bottom wall part of the flywheel 23, the boss 23b hangs on the rotating shaft 26 of the engine, and the magnetic pole of the magnet rotor 25 is the core of the stator. The magnetic poles at the tips of the teeth T1 to T12 of 20 are opposed to each other through a predetermined gap. As an example of illustration, odd-numbered teeth T1, T3,... The armature coils 21 wound around T11 are connected in series with each other in a state in which their polarities are combined, and output terminals 11a and 11b for connecting discharge lamps from both ends of the series circuit of these armature coils. Is being derived.

Although not shown, even-numbered teeth T2, T4,... The armature coils can also be wound around T12 to use these armature coils for driving a load other than a discharge lamp.

As the magnetic alternator shown in Fig. 5, by adjusting the number of turns of the armature coil 21, it is possible to appropriately adjust the magnitude of the no-load voltage Va and the reduction ratio of the output voltage to the increase of the output current. In addition, the pole height α of the magnetic pole portion at the tip of each salient pole portion of the iron core 20 of the stator is increased so that leakage magnetic flux flowing through the adjacent magnetic pole portions of the stator when each magnetic pole portion of the stator faces each magnetic pole of the rotor (for example, FIG. In 5, the magnetic current flowing through the magnetic pole M1 through the magnetic pole portion of the tip of the tooth T2 and the magnetic pole portion of the tip of the adjacent tooth T3 to increase the magnetic flux flowing through the magnetic pole M2). The rate of decrease of the output voltage with respect to the increase can be increased.

FIG. 6 shows an example of the characteristics of the magnetic alternator, in which the curves Nl, N2 and N3 represent the rotational speeds of the generators Nl, N2 and N3, respectively. When Nl <N2 <N3, the relationship between the output voltage E and the output current I is shown. The curves P1, P2 and P3 show the relationship between the output voltage E and the generator output P at the rotational speeds of Nl, N2 and N3, respectively.

Moreover, the generator 11 has the characteristics which can obtain the a point | point, b point, and c point which are shown in FIG. 7, and are not limited to a magnetic alternator. For example, an induction generator, a synchronous generator, which has a magnet and an armature coil on the stator side, an inductor on the rotor side, and induces an alternating voltage to the armature coil due to a change in the magnetic flux generated by the rotation of the inductor; DC generators and the like can be used.

In the above embodiment, when the output voltage of the generator is applied to the discharge lamp directly or through a rectifier, when the discharge start voltage of the discharge lamp to be turned on is high, for example, when the metal halide lamp is turned on, As shown in Fig. 3, a starter circuit 14 for generating a high voltage pulse at the start of a discharge lamp is provided using the generator 11 as a power source, and the output pulse of the starter circuit 14 is applied to the output voltage of the generator 11. It is good to configure it so that a voltage is applied to a discharge lamp by overlapping. Also in this case, the output characteristic of the generator 11 is a dropping characteristic, and the output voltage at no load is set to a magnitude necessary to generate a high voltage pulse higher than the discharge start voltage of the discharge lamp in the starting circuit, and the short circuit current is discharged. The output characteristics of the generator are set so as to have a size necessary to limit the discharge current immediately after the start of discharge to an allowable value or less, and to maintain the terminal voltage and the discharge current of the discharge lamp in the normal range within the rated range.

The above-mentioned starter circuit is, for example, the charge of the capacitor in preparation for the capacitor charged by the output of the generator 11 and the discharge circuit for discharging the charge of the capacitor through the primary coil of the boost transformer at the start of the boost transformer and the discharge. A circuit can be used in which the high voltage pulse is maintained on the secondary coil of the boost transformer by the discharge of. In this case, the output voltage of the generator 11 applies a voltage to the discharge lamp through the secondary coil of the boost transformer.

4 shows a specific configuration example of the starter circuit 14 used in the embodiment of FIG. In the starter circuit 14 shown in FIG. 4, a known double voltage rectifying circuit is constructed from the capacitors Cl and C2 and the diodes D1 and D2, and the input side capacitor Cl of the double voltage rectifying circuit is configured. The output terminal 11a and the other output terminal 11b of the generator 11 are connected to the terminal of the input side of the () and the terminal of the low potential side of the output capacitor (C2). One of the primary coil Ll of the boost transformer Tsf is connected to the terminal of the high potential side of the capacitor C2 on the output side of the double voltage rectifying circuit, and the other of the primary coil Ll and the low of the capacitor C2 are connected. A discharging thyristor SCRl with the anode directed to the primary coil Ll side is connected between the terminal on the potential side. The resistor Rl is connected between the gate cathode of the thyristor SCRl, and the diode D3 is connected in parallel between the anode and the cathode of the thyristor SCRl toward the cathode side of the thyristor SCRl. have. The cathode of the thyristor SCR2 for the trigger is connected to the gate of the thyristor SCRl, and the anode of the thyristor SCR2 is connected to the primary coil of the boost transformer Tsf through the resistor R2. It is connected to the other side of L1). The anode of the zener diode ZD is connected to the gate of the thyristor SCR2, and the resistor R3 is connected between the gate cathodes of the thyristor. A resistance voltage divider consisting of resistors R4 and R5 is connected between the other side of the primary coil L1 of the boost transformer and the terminal of the low potential side of the capacitor C2 via a start switch SW. The cathode of the zener diode ZD is connected to the voltage dividing point of the resistance voltage dividing circuit.

One of the secondary coils L2 of the boosting transformer Tsf is connected to the connection point between the output terminal 11a of the generator 11 and the capacitor Cl of the input side of the double voltage rectifier circuit, and the secondary coil L2. A discharge lamp 12 having a high starting voltage, such as a metal halide lamp, is connected between the other side of the generator 11 and the output terminal 11b of the other side of the generator 11.

The start switch SW is constituted by a push button switch, and the contact is closed only while the push button is pressed.

In the lighting device shown in Fig. 4, when the generator 11 generates a voltage, the capacitor C2 is charged to the polarity of the figure up to a voltage twice the maximum value of the output voltage of the generator. When the start switch SW is closed, in order to conduct the zener diode ZD and trigger the thyristor SCR2, the thyristor SCR2 conducts and gives a thyristor SCRl a trigger signal. As a result, when the thyristor SCR1 conducts, a discharge circuit of the capacitor C2 is configured, and the charge of the capacitor C2 is discharged through the primary coil and the thyristor SCR1 of the boost transformer Tsf. By the change of the primary current of the boost transformer Tsf generated by this discharge, a high voltage pulse is generated in the secondary coil L2 of the boost transformer. Since this high voltage pulse is applied to the discharge lamp 12 in superimposition with the output voltage of the generator 11, the discharge of the discharge lamp 12 is started and a discharge lamp lights. After the discharge is started and the switch SW is opened, the output voltage of the generator 11 is applied to the discharge lamp 12 through the secondary coil L2 of the boost transformer, so that the discharge lamp 12 is kept in the lit state. .

FIG. 8 shows the present invention in the case where a plurality of (four in the example shown) discharge lamps L1 to L4 are turned on. In this case, the generator 11 has the electric power coils Wl to W4 for electrically discharging the first to fourth discharge lamps independently, and the power coils W1 to light for discharging the first to fourth discharge lamps. The output voltage of W4 is applied directly to the first to fourth discharge lamps L1 to L4, respectively. The generator 11 may be a direct current generator or an alternator.

In addition, there is no electrical interference between power generating coils for discharging a plurality of discharge lamps, that is, “electrically independent”, that is, a load current flowing through the power coils for discharging each discharge lamp flows through a different generating lamp lighting coil. It means that nothing is applied to the power generation coil for discharge lamp lighting other than the output voltage of the power generation coil for discharge lamp lighting.

In addition, FIG. 9 shows another case when the plurality of discharge lamps are turned on. In this example, the generator 11 is made of a magnetic alternator, and electrically independent first to fourth discharge lamps provided in the generator 11 are shown. The output voltages of the power generating coils W1 to W4 for lighting are applied to the first to fourth discharge lamps Ll to L4 through the first to fourth rectifiers Dl to D4, respectively. .

In the lighting apparatus shown in Figs. 8 and 9, the generator 11 is configured such that each of the output characteristics of the power generation coils W1 to W4 for discharge lamp lighting exhibits a drooping characteristic, and thus the power generation coil for each discharge lamp lighting. The output voltage at no load is higher than the discharge start voltage of the discharge lamp, the short circuit current of each of the discharge lamp lighting coils limits the discharge current immediately after the discharge lamp starts to discharge to below the allowable value, and the power coil for lighting each discharge lamp. The output characteristics of the power generation coils for lighting each discharge lamp are set so that the discharge voltage and the discharge current at the time of the discharge lamp to which the output voltage is applied are normally maintained in the rated range.

In the present invention, the stator of the generator 11 is provided with a means for loosening the coupling between the magnetic circuits of the discharge lamp lighting power generation coils W1 to W4 to support the power generation coil for each discharge lamp lighting. The magnetic field action caused by the electric current which is present does not affect the output voltage of the power coil for lighting other discharge lamps.

In addition, the voltage fluctuations generated in the power generating coils for discharging different discharge lamps by the load current flowing from the power discharging coils for discharging the lamps to the magnetic circuits of the power coils for plural discharge lamp lighting are loosened. To coarse magnetic coupling between the magnetic circuits of the power coils for plural discharge lamp lighting to the extent that it does not interfere with the lighting of the lamps. Means that little magnetic flux flows between the coil and the wire).

The characteristics of the output current I [A] of the output voltage E [V] of the power generating coil for discharging each discharge lamp of the generator 11 used as the lighting device of FIGS. 8 and 9 are shown in the curve 1 of FIG. An example of the relationship between the terminal voltage and the discharge current at this cold time is shown in curve 2 in FIG. 14. In addition, the characteristics of the generator output P [W] of the output voltage E of the generator are shown in the curve 3 of FIG. 14, and the generator input p [W] of the output voltage E of the copper generator (for one discharge lamp lighting). An example of the characteristics for the input per power generation coil is shown in the curve 4 of FIG.

In the lighting apparatus of FIGS. 8 and 9, the no-load voltage EA generated by the discharge lamp lighting power generation coils W1 to W4 of the generator 11 is set higher than the discharge start voltage EA. The discharge current (current at point B) immediately after the discharge is started by setting the characteristics of the output voltage band output current characteristic curve l of the power generation coils W1 to W4 for turning on a plurality of discharge lamps of the generator as dropping characteristics. The size of each short-circuit current (current at the point in FIG. 14) Ic of the power generation coils W1 to W4 for discharging the discharge lamp is set so as to limit the size to the size allowed or less for the discharge lamp. Further, the terminal voltage and the discharge current in the steady state of the discharge lamps L1 to L4 to which the respective output voltages of the power generation coils W1 to W4 for discharge lamp lighting are applied (for example, the point b in FIG. The output characteristics of the power generation coils for lighting each discharge lamp are set such that the voltage E ₃ and the current I ₃ are settled in the rated range of the discharge lamp. As an example shown in FIG. 14, the generator output P at the stable point b in the steady state of a discharge lamp is (P3), and an input (output of the internal combustion engine 10) (p) necessary to obtain this output P3 (p) ) Is (p3).

That is, the discharge lamp lighting power generating coils Wl-(so that the output voltage band output current characteristic curves 1 of the discharge lamp lighting power generating coils W1-W4 pass through the points a, b and c. Each output characteristic of W4) is set. In this case, the rated output of the whole generator is (P3) × 4, and the rated output of the internal combustion engine is (p3) × 4.

Further, in the present invention, the effect of the electromagnetism generated when a load current (discharge current) flows through each of the discharge lamp lighting coils is suppressed to a range that does not interfere with the lighting of the discharge lamp. To the extent that it is possible, that is, to the extent that it does not interfere with the lighting of the discharge lamp, the range of fluctuations generated in the output voltage of the other power lamp lighting coil when a discharge current flows through each of the discharge lamp lighting coils. The magnetic coupling between the magnetic circuits of the power generation coils W1 to W4 for lighting the discharge lamp is loosened. In general, in order to cause the discharge lamp to be lit without interruption, it is necessary to suppress the fluctuation range with respect to the rated terminal voltage of the terminal voltage of the discharge lamp within ± 5 to 6%.

As described above, power generator coils W1 to W4 that are electrically independent of the generator are provided in the generator, and the discharge lamps L1 to L4 are individually driven by the plurality of discharge lamp lighting coils. In this configuration, it is possible to prevent the internal combustion engine 10 and the generator 11 from being overloaded at the start of the discharge lamp, and to lower the rate of change of the voltage applied to each discharge lamp so that each discharge lamp can be lit without interruption. .

In addition, as described above, if the magnetic circuits of the plurality of discharge lamp lighting coils are loosely coupled, the effect of driving current flowing through each of the discharge lamp lighting coils on the output voltages of the other lighting lamp coils is reduced. Therefore, a plurality of discharge lamps can be lit stably.

Fig. 11 shows an example of the configuration of a magnetic alternator suitable for use as the lighting device of Figs. 8 and 9, and the generator is provided in the outer peripheral portion of the annular yoke 20a (20 in the example). Predetermined teeth T2, T3,... Of stator iron core 20 having a structure in which teeth T1 to T20 are formed at equiangular intervals. Unit coils u2, u3,. The permanent magnet 24 is fixed so as to show a ring shape on the inner circumference of the stator 22 and the inner wall of the main wall portion 23a of the flywheel 23 formed in the shape of a cup. It consists of the magnet rotor 25 which consists of the number of poles (20 poles which is the same as the number of the teeth of a stator in the figure), and comprised the rotor magnetic pole M1-M20.

The boss 23b provided in the center of the bottom part of the flywheel 23 is provided in the rotating shaft 26 of an engine. The stator 22 is fixed to the stator mounting portion provided in the case of the internal combustion engine 10, and the magnetic poles M1 to M20 of the magnet rotor 25 are provided with the teeth T1 to the core of the stator core 22. The magnetic pole portion of the tip of T20 is opposed through a predetermined difference.

As an example of the illustration, the unit coil is evenly wound around 16 teeth among 20 teeth provided on the stator core. Then, one unit coil group is divided into four unit coils, each of which is wound around four teeth in parallel in the main direction of the stator, and sixteen unit coils are divided into four unit coil groups, and each unit coil group discharges each lamp. The power generation coil for lighting is constructed.

In more detail, the unit coils (u2) to (u5) wound around the teeth (T2) to (T5) of the stator core respectively are one unit coil group, and these unit coils are in a state in which their polarities are combined. By connecting in series (in the state where each induced voltage is added to each other with the same polarity), the 1st discharge lamp lighting power generation coil W1 shown in FIG. 1 and FIG. 2 is comprised.

FIG. 12 shows a portion of the stator 22 in which unit coils u2 to u5 constituting the first discharge lamp lighting power generation coil Wl are wound. As shown in FIG. The end of the wound unit coil u2 is wound over the tooth T3, and the unit coil u3 is wound differently from the unit coil u2 on the tooth T3. Further, the winding of the unit coil u3 is over the tooth T4, and the unit coil u4 is wound around the tooth T4 in a different direction from the unit coil u3, and the unit coil u4 is wound. The winding end is spread over the tooth T5, and the unit coil u5 is wound around the tooth T5 differently from the unit coil u4.

In this way, unit coils u7 to u10 wound around the windings T7 to T10 of the stator core alternately differently as one unit coil group are connected in series. The unit coil u12 which forms the 2nd electric power coil W2 for lighting of the discharge lamp shown in FIG. 8, and FIG. 9, alternately winds the winding direction which alternately winds around the teeth part T12-T15 of a stator core, respectively. ) (U15) as one unit coil group, by connecting these unit coils in series, the 3rd electric discharge lamp lighting power generation coil W3 shown to FIG. 8 and FIG. 9 is comprised.

Further, by connecting the unit coils u17 to u20 wound around the teeth T17 to T20 of the stator core alternately, the power coil for turning on the fourth discharge lamp W4 is connected. Configure

As the generator shown in Fig. 11, a vacant portion T1 in which coils are not rolled up between portions of unit coil groups constituting the power coils W1 to W4 for discharge lamp lighting of the stator core, respectively, (T6), (T11) and (T16) are provided to loosen the coupling of the magnetic circuits of the power coils for the discharge lamp lighting adjacent to each other by these empty portions Tl, T6, T11 and T16. Doing.

Moreover, in the example shown in FIG. 11, although the black spot and twelve which were enclosed by the circle are displayed in the part of each unit coil, the direction of the electric current which flows in each part of a unit coil is shown at the time of these indications. The sunspots indicate that current is flowing from the rear side of the illustrated ground surface to the outside, and the crosses show that the current is flowing from the outer surface of the figure to the rear side.

As the magnetic alternator shown in Fig. 11, unit coils u2, u3,... By adjusting the number of turns, the magnitude of the no-load voltage EA and the rate of decrease of the output voltage with respect to the increase in the output current can be appropriately adjusted. Furthermore, the pole height α of the magnetic pole of the tip of each tooth of the iron core 20 of the stator is increased, and the leakage magnetic flux flowing through the magnetic pole adjacent to the stator when each magnetic pole portion of the stator faces each magnetic pole of the rotor (for example, In Fig. 11, the magnetic flux flowing through the magnetic pole M3 through the magnetic pole portion M2 of the magnet through the magnetic pole portion of the tip of the tooth T2 and the magnetic pole portion of the tip of the adjacent tooth T3) is increased. The rate of decrease of the output voltage against increase can be increased.

In the above example, the number of teeth of the stator and the number of poles of the rotor are the same, but they may be different. In general, when the n discharge lamps are turned on, m stator cores having m teeth (m is an integer, m " gn) in parallel with the main direction of the rotor and k stator cores (k is n A stator is formed by k discharge lamp lighting unit coils wound around the teeth of k "fm), each of which is an integer multiple of integer. In a continuous line in the main direction of the stator, p unit coils each wound around p teeth (p is an integer p = k / n) are grouped into one unit coil and k unit coils are n units. By dividing into coil groups, n discharge lamps are individually driven by the n unit coil groups, and an electric power coil for lighting n discharge lamps that are electrically independent may be configured.

As an example shown in Fig. 11, a coil is wound between a portion in which the unit coil group constituting the power generation coil for each discharge lamp lighting of the stator core is wound and a portion in which the unit coil group constituting the power coil for lighting the adjacent discharge lamp is wound. Although the coupling of the magnetic circuits of the power generating coils for adjacent discharge lamp lighting is loosened by providing an unoccupied vacant portion, a portion of the unit coil constituting the power coils for each of the discharge lamp lighting coils of the stator core is wound, By providing a magnetic gap between the unit coil group constituting the power generating coil for discharging lamp lighting (the magnetic circuits of the power coil for plural discharge lamp lighting), the magnetic force of the power coil for discharging the adjacent lamp lighting. The coupling of the circuits may be loosened.

FIG. 13 discloses an example in which coupling of magnetic circuits of power coils for discharging lighting lamps adjacent to each other is loosened by providing magnetic gaps between the magnetic circuits of power generating coils for discharge lamp lighting. 11 removes the teeth T1, T6, T11, and T16 from the stator core 20 of the generator shown in FIG. 11, and at the same time, the teeth Tl, T6, and T of the yoke 20a. By forming magnetic gaps G1 to G4 in the portions where T11 and T16 are provided, the stator iron core 20 is divided into four divided iron cores 20A to 20D. The other point is the same as that of the generator shown in FIG.

The term "magnetic space" means a portion that acts as a space with respect to magnetic flux, and a nonmagnetic material is preferably filled in the space.

The generator 11 used for the lighting device shown in FIG. 8 and FIG. 9 is not limited to the magnetic alternator as long as it has output characteristics from which point a, point b and point c shown in FIG. 14 can be obtained. For example, an induction generator or a synchronous generator having a magnet and an armature coil on the stator side, an inductor on the rotor side, and inducing an alternating voltage to the armature coil by a change in magnetic flux caused by the rotation of the inductor. , Or a DC generator can be used.

In the example shown in Fig. 8, the output voltage of each of the discharge lamp lighting power generation coils is directly applied to the discharge lamp. In the example shown in Fig. 9, the output voltage of each of the discharge lamp lighting power generation coils is applied to the discharge lamp through the rectifier. When the discharge start voltage of the discharge lamp is high, for example, when the metal halide lamp or the like is turned on, as illustrated in FIG. 10, the power generation coils W1 to W4 for lighting the discharge lamp of the generator 11 are turned off. As the power source, start circuits Sl to S4 which generate high voltage pulses at the start of discharge lamps L1 to L4, respectively, are provided, and the output pulses of the start circuit S4 are supplied to the discharge lamp lighting coil W1. It is preferable to configure so that it may apply to discharge lamp L1-L4 superimposed on the output voltage of (W4). In this case, the output voltage versus output current characteristics of the power generator coil for discharging lamp lighting of the generator 11 is a dropping characteristic, and the output voltage at no load of the power generator coil for discharging lamp lighting is higher than the discharge starting voltage of the discharging lamp in the starting circuit. In addition to the size necessary to generate high voltage pulses, the short circuit current is required to limit the discharge current immediately after the start of discharge, such as discharge, to below the allowable value. The output voltage versus output current characteristics of the generator 11 are set so as to be maintained at.

As each of the start circuits S1 to S4 described above, one having the same configuration as that of the start circuit S shown in FIG. 4 can be used.

In the above description, the case where four discharge lamps are turned on has been exemplified, but the present invention can be generally applied to the case where the plurality of discharge lamps are turned on. For example, when the generator shown in FIG. 11 is used, the power generation coil W1 consisting of the unit coils u2 to u5 and the power generation coil W3 consisting of the unit coils u12 to u15 are used for lighting the discharge lamp. As a power generation coil, it is preferable to make two discharge lamps light by these discharge lamp lighting power generation coils. As described above, when only a part of the power generation coils in the plurality of power generation coils constituted by connecting the unit coils is used as the power generation coil for discharging the discharge lamp, the power generation coils disposed as far apart as possible can be used as the power generation coil for discharging the discharge lamp. It is good. In this case, the other two power generation coils W2 and W4 which are not used as the power generation coil for discharging lamp lighting can be used to drive other loads such as incandescent lamps.

As an example shown in FIG. 11 and FIG. 13, although a magnetic alternator is prepared as an example of a generator for discharging a discharge lamp lighting, a stator of 20 poles is used. In the present invention, the number of poles of the stator of the generator (number of unit coils) m Silver may be more than the number n of discharge lamps to be lit, and is not limited when using a 20-pole stator.

As the generator for lighting the discharge lamp shown in Fig. 11, one vacant portion is provided between the magnetic circuits of the power coils for plural discharge lamp lighting, but two or more vacant portions are provided between the magnetic circuits of the power coils for the plural discharge lamp lighting. Also good.

In the above example, the power coils for lighting each discharge lamp are constituted by four unit coils. However, in the present invention, the number of unit coils constituting each power lamp for lighting each discharge lamp is arbitrary.

No content.

Claims (10)

To prepare a generator driven by an internal combustion engine, The output voltage of the generator is applied to the discharge lamp (discharge lamp), The generator is configured such that the output voltage versus the output current characteristics exhibit a dropping characteristic, the output voltage at no load of the generator is higher than the discharge start voltage of the discharge lamp, and the short circuit current is the discharge start of the discharge lamp. An internal combustion engine whose size is necessary to limit the discharge current immediately after the allowable value or less, and whose output voltage versus output current characteristics of the generator are set to maintain the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range. Drive discharge lamp lighting device. To prepare a generator driven by an internal combustion engine, The output voltage of the generator is directly applied to the discharge lamp, The generator is configured such that the output voltage versus the output current characteristics exhibit a drooping characteristic, and the output voltage at no load of the generator is higher than the discharge start voltage of the discharge lamp, and the short circuit current is a discharge current immediately after the discharge start of the discharge lamp. Is an internal combustion engine driven discharge lamp ignition device having a size necessary to limit the voltage to an allowable value or less, and in which the output voltage versus output current characteristics of the generator are set to maintain the terminal voltage and discharge current of the discharge lamp in a normal range. . Prepare a generator driven by an internal combustion engine to generate an AC voltage and a rectifier rectifying the output voltage of the generator, The output of the rectifier is directly applied to the discharge lamp, The generator is configured such that the output voltage vs. output current characteristics exhibit a drooping characteristic, and the output voltage at no load of the generator is higher than the discharge start voltage of the discharge lamp, and the short circuit current is a discharge current immediately after the discharge start of the discharge lamp. Is an internal combustion engine driven discharge lamp ignition device having a size necessary to limit the voltage to an allowable value or less, and in which the output voltage versus output current characteristics of the generator are set to maintain the terminal voltage and discharge current of the discharge lamp in a normal range. . Prepare a generator which is driven by an internal combustion engine to generate an AC voltage and a starting circuit which generates a high voltage pulse at the start of a discharge lamp using the generator as a power source, The output pulse of the starting circuit is superimposed on the output voltage of the generator and applied to a discharge lamp, The generator is configured such that the output voltage vs. output current characteristics exhibit a drooping characteristic, and the output voltage at no load of the generator has a magnitude necessary to make the maximum value of the high voltage pulse higher than the discharge initiation voltage such as a discharge lamp. At the same time, the output voltage range of the generator is such that the short-circuit current has a magnitude necessary for limiting the discharge current immediately after the discharge start of the discharge lamp to an allowable value or less, and also maintains the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range. An internal combustion engine driven discharge lamp lighting device having an output current characteristic set therein. A generator driven by an internal combustion engine to generate an alternating voltage; The secondary circuit of the boost transformer by the discharge of the charge of the capacitor, in contrast to the discharge circuit for discharging the charge of the capacitor through the primary coil of the boost transformer at the start of the capacitor, boost transformer and discharge discharged by the output of the generator. Prepare a starter circuit that induces high voltage pulses in the coil, The output voltage of the generator is applied to the discharge lamp through the secondary coil of the boost transformer, and the generator is configured such that the output voltage vs. output current characteristic exhibits a dropping characteristic, and the output voltage at no load of the generator is It is higher than the discharge start voltage of the discharge lamp and has a size necessary to limit the discharge current immediately after the discharge start of the discharge lamp to below the allowable value, and to maintain the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range. And an internal combustion engine driven discharge lamp lighting device of which the output voltage versus output current characteristics of the generator are set. As a discharge lamp lighting device for lighting a plurality of discharge lights, In contrast to a generator for a multi-pole rotor driven by an internal combustion engine and a stator having a plurality of power coils for lighting a discharge lamp electrically independent of each other, The output voltages of the power generation coils for lighting the plurality of discharge lamps of the generator are respectively supplied to the discharge lamps, The stator of the generator is a means for loosening the coupling of magnetic circuits of the plurality of discharge lamp lighting coils in order to suppress an armature reaction caused by the plurality of discharge lamp lighting coils. In preparation for The output voltage of the power generating coil for each discharge lamp lighting decreases with the increase of the output current, and the output voltage at the no load of the power generating coil for each discharge lamp lighting is higher than the discharge starting voltage of the discharge lamp, and the short circuit current is the discharge lamp. It has the necessary size to limit the discharge current just after the discharge start to below the allowable value, and to keep the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range, the output voltage vs. output current of the power generating coil for lighting each discharge lamp. An internal combustion engine driven discharge lamp lighting device characterized in that the characteristic is set. A discharge lamp lighting device for lighting n discharge lamps (n is an integer of 2 or more), wherein m poles (m is an integer, m "gn are arranged side by side in the circumferential direction of the rotor and the multipole driven by the internal combustion engine) A generator with stator cores with teeth and k stator cores with k (k is an integer multiple of n, k " K unit coils of the generator are p unit coils wound on p teeth (p is an integer p = k / n) in parallel with each other in the main direction of the stator as n unit coil groups The unit coil group is divided into n unit coil groups, and each of the n unit coil groups is configured to generate n discharge lamp lighting coils, and the output voltages of the n discharge lamp lighting coils of the generator are supplied to the n discharge lamps, respectively. , The portion in which the coil is not wound is installed between the portion in which the unit coil group constituting the power generation coil for discharging lamp lighting of the stator core is wound and the portion in which the unit coil group constituting the power generation coil for discharging lamp lighting is adjacent. The magnetic circuits of the power generating coils for lighting n discharge lamps are loosened, The output voltage of the power generating coil for each discharge lamp lighting decreases with the increase of the output current, and the output voltage at the no load of the power generating coil for each discharge lamp lighting is higher than the discharge starting voltage of the discharge lamp, and the short circuit current is the discharge lamp. The output voltage vs. output current characteristics of the power generation coil for each discharge lamp lighting, having the necessary size to limit the discharge current immediately after the discharge starts to below the allowable value, and to maintain the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range. An internal combustion engine driven discharge lamp lighting device, characterized in that is set. A discharge lamp lighting device for lighting n discharge lamps (n is an integer of 2 or more), The stator iron core having a multipole rotor driven by an internal combustion engine, and m teeth (m is an integer, m " m) side by side in the circumferential direction of the rotor, and k of stator iron cores (k is n In contrast to the generator having a stator having k discharge lamp lighting unit coils wound around the teeth of k "fm), respectively, The k unit coils of the generator are p unit coils wound on the teeth of P pieces (p is an integer p = k / n) in parallel to the main direction of the stator as n unit coil groups. Divided into unit coil groups, and the n unit coil groups each constitute n discharge lamp lighting power generation coils, The output voltages of the power generator coils for lighting n discharge lamps of the generator are supplied to the n discharge lamps, respectively. A magnetic gap is provided between a portion in which the unit coil group constituting the power generation coil for discharging lamp lighting of the stator core is wound and a portion in which the unit coil group constituting the power coil for lighting the discharge lamp is adjacent to each other. The magnetic circuits of the power coils for lighting n discharge lamps are loosened, The output voltage of the power generating coil for each discharge lamp lighting decreases with the increase of the output current, and the output voltage at the no load of the power generating coil for each discharge lamp lighting is higher than the discharge starting voltage of the discharge lamp, and the short circuit current is the discharge lamp. It has the necessary size to limit the discharge current just after the discharge start to below the allowable value, and to maintain the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range. An internal combustion engine driven discharge lamp lighting device characterized in that the characteristic is set. A discharge lamp lighting device for lighting n discharge lamps (where n is an integer of 2 or more), a multipole rotor driven by an internal combustion engine and m (m is an integer, m ") side by side in the main direction of the rotor. a generator having a stator core having a tooth of gn) and a stator having k discharge lamp lighting unit coils wound around k teeth of k stator cores (k is an integer multiple of n, k "fm); It is provided in correspondence with the n discharge lamps, and prepares n start circuits that generate high voltage pulses at the start of each of the n discharge lamps, The k unit coils of the generator are p unit coils each wound on the teeth of p pieces (p is an integer p = k / n) in parallel to the main direction of the stator as n unit coil groups. Divided into a unit coil group, and the n unit coil groups produce n discharge lamp lighting coils corresponding to n electric discharge lamps, respectively. The output voltages of the n-discharge lamp lighting coils are applied to the n-discharge lamps at the same time as the high voltage pulses generated by the n-start circuits. Between the wound portion and the portion in which the unit coil group constituting the power generating coil for discharging the adjacent lamps is wound, a tooth without a coil is provided, and the coupling of the magnetic circuits of the n discharge lamp lighting coils Loosened, The output voltage of the power generating coils for each discharge lamp lighting decreases with the increase of the output current, and the output voltage at the no load of the power generation coil for each discharge lamp lighting is higher than the discharge starting voltage of the discharge lamp, and the short circuit current is the discharge lamp. It has the necessary size to limit the discharge current just after the discharge start to below the allowable value, and to maintain the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range. An internal combustion engine driven discharge lamp lighting device characterized in that the characteristic is set. A discharge lamp lighting device for lighting n discharge lamps (where n is an integer of 2 or more), wherein a multipole rotor driven by an internal combustion engine and m poles (m is an integer, m " a generator having a stator core having a tooth of gn) and a stator having k discharge lamp lighting unit coils wound around k teeth of k stator cores (k is an integer multiple of n, k "fm); In preparation for the n start circuits provided corresponding to the n discharge lamps and generating high voltage pulses at the start of each of the n discharge lamps, The k unit coils of the generator are p unit coils wound on the teeth of P pieces (p is an integer p = k / n) continuously in the main direction of the stator as n unit coil groups. Divided into unit coil groups, and the n unit coil groups constitute n discharge lamp lighting coils corresponding to the n discharge lamps, respectively. Each of the n start circuits discharges the capacitor or charge through the primary coil of the boost transformer when the capacitor is charged by the output of the corresponding power generation coil for discharging the discharge lamp, the boost transformer, and the lighting of the corresponding discharge lamp. It is configured to prepare a discharge circuit and generate a high voltage pulse on the secondary coil of the boost transformer by discharge of the charge of the capacitor, An output voltage of the power generator coils for lighting the n discharge lamps is applied to the n discharge lamps through the secondary coils of the boost transformers of the n start circuits, respectively, and unit coil groups constituting the power generator coils for lighting the respective discharge lamps of the stator core. A magnetic gap is provided between the wound portion and the portion of the unit coil group constituting the power generating coil for discharging adjacent lamps, and the coupling of the magnetic circuits of the n discharge lamp lighting coils becomes loose. , The output voltage of the power generation coil for each discharge lamp lighting decreases with the increase of the output current, and the output voltage at the no load of the power generation coil for each discharge lamp lighting is higher than the discharge starting voltage of the discharge lamp, and the short circuit current is the discharge lamp. It has the necessary size to limit the discharge current just after the discharge start to below the allowable value, and to maintain the terminal voltage and discharge current of the discharge lamp in the normal range within the rated range. An internal combustion engine driven discharge lamp lighting device characterized in that the characteristic is set.