JPH08222384A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE: To provide a discharge lamp lighting device which can heighten secondary voltage without enlarging the cores of current transformers by enhancing the magnetic coupling between the cores and the windings of the current transformers. CONSTITUTION: Wiring 4 is provided using two parallel wires, a coupled portion where their covers are mechanically coupled together in a portion of the wiring is cut open, and the ongoing and returning wires 4A, 4B close to each other are passed respectively through the cores 5A, 5B of a pair of small-current transformers to form primary windings. Secondary windings to be wound on the cores 5A, 5B are connected in series and opposite to each other to constitute the secondary winding of one current transformer CT, and discharge lamps 3 are connected to both ends of this series circuit. Thus the mechanical coupling property between the cores and the windings constituting the current transformers can be enhanced, and secondary voltage can be obtained that is high enough to ensure that the discharge lamps can be lighted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a discharge lamp lighting device for receiving a current supplied from a high frequency power source in a current transformer and lighting a discharge lamp with a secondary output of the current transformer.

[0002]

2. Description of the Related Art FIG. 12 shows a conventional example. In this conventional example, a high frequency constant current source 1 is connected to a commercial power source Vs via a power switch S.
, A long wire 4 is connected between the pair of output terminals of the high frequency constant current source 1, and the primary windings n ₁ of a plurality of current transformers CT are inserted and connected in the middle of the wire 4. Each current transformer CT has a discharge lamp 3 connected to the secondary winding n ₂ , and each discharge lamp 3 has a preheating capacitor 2 connected between the ends of the filament on the non-power source side.

The high frequency constant current source 1 is a current transformer CT 1.
A constant primary current I ₁ having a frequency of f is supplied to the secondary winding n ₁ through the wiring 4, and each current transformer CT has a primary current I ₁
Corresponding to the above, a constant secondary current I ₂ is supplied to the discharge lamp 3 as a lamp current through the secondary winding n ₂ . Here, the number of turns of the primary winding n ₁ is N ₁ , the number of turns of the secondary winding n ₂ is N ₂ , 1
If the inductance of the secondary circuit is L ₁ , the secondary current I
₂ is I ₂ = (N ₁ / N ₂ ) · I ₁ (1) The lamp voltage V ₂ is represented by V ₂ = (N ₂ / N ₁ ) · I ₁ · 2πf · L ₁ (2)

However, this method has a problem that a lot of noise is generated because a high frequency current is passed through the loop-shaped wiring 4. In order to solve the above-mentioned problems of the conventional example, FIG. 13 shows a parallel electric wire in which one end is connected to the output end of the high frequency constant current source 1 and the other end is connected to each other in parallel to form parallel wires 4 Used for the parallel 2 of this wiring 4.
Cut the connecting part of the line as shown in FIG.
The wire 4A or 4B is inserted into the through hole of the toroidal core used in the core 5 of the current transformer CT, and the inserted wire is used as the primary winding of the current transformer CT to reduce noise in parallel two wires. High frequency power is sent to the secondary side while
The lamp current is supplied to the discharge lamp 3 which is the secondary load.

FIG. 15 shows another conventional example. In this conventional example, the current transformer CT of FIG. 13 uses a toroidal core as the core 5, but a U / I core is used as shown in FIG. The wire 4 is clamped to the wire 4A or 4B. In this conventional example, a clamp type core 5
Since the wiring 4 is used, the arrangement position of the lighting fixture is arbitrarily set after the wiring 4 is constructed, and the contactless connection with the wiring 4 is made possible.

As a structure of this clamp type current transformer CT, there is a plier type (described in Japanese Utility Model Publication No. 1-180152) having a grip portion as shown in FIG. You can do it. In the clamp type conventional example as described above, the high frequency constant current power source 1
High-frequency current is sent to the wiring 4 with each current transformer C
Since it is supplied to the discharge lamp 3 which is the load on the secondary side at T, it can be connected in a contactless manner, and the lighting fixture can be freely installed by making the core of the current transformer CT a clamp type, etc. There is an advantage that noise can be reduced by constructing the wiring 4 and forming the wiring 4 in parallel.

[0007]

However, in the conventional example shown in FIGS. 13 to 17, the current transformer CT has a structure in which the wire 4 is inserted into the core, and the number of turns of the primary winding is one. The magnetic coupling with the core of the current transformer CT deteriorates, and unless the core is enlarged, the core is saturated and the secondary side voltage cannot be obtained as calculated as shown in the above equation (2). Therefore, there is a problem that the discharge lamp 3 that requires a high voltage (for example, about 450 V) at the time of starting is difficult to start and light.

Further, in order to obtain the secondary side voltage in accordance with the theoretical value, it is necessary to increase the core cross-sectional area, which causes a problem that the core becomes large and the lighting fixture becomes large. Furthermore, as shown in the above equation (1), assuming that the primary winding has one turn, in order to supply electric power to the secondary side, the primary current I ₁ (current flowing in the wiring 4)
However, there was a problem that

The present invention has been made in view of the above problems. An object of the present invention is to improve the magnetic coupling between the core of the current transformer and the primary winding. It is an object of the present invention to provide a discharge lamp lighting device capable of increasing the secondary voltage without increasing the size of the core and reducing noise. The object of the invention of claim 2 is, in addition to the object of the invention of claim 1, to provide a discharge lamp lighting device with improved workability.

A third object of the present invention is, in addition to the object of the first invention, is to provide a discharge lamp lighting device capable of further reducing noise generation from wiring. The object of the invention of claim 4 is that, in addition to the object of the invention of claim 1, the current transformer can be easily moved and the magnetic coupling between the core of the current transformer and the primary winding is improved. A discharge lamp lighting device is provided.

The object of the invention of claim 5 is, in addition to the object of the invention of claim 1, that the magnetic coupling between the core and the primary winding is further improved to reliably start and illuminate the discharge lamp. Another object of the present invention is to provide a discharge lamp lighting device capable of obtaining a secondary output that can be obtained and also capable of moving a current transformer. The object of the invention of claim 6 is that, in addition to the object of the invention of claim 1,
It is an object of the present invention to provide a discharge lamp lighting device capable of easily moving a current transformer.

The object of the invention of claim 7 is, in addition to the object of the invention of claim 1, to provide a discharge lamp lighting device capable of further reducing noise from wiring.

[0013]

In order to achieve the above object, in the invention of claim 1, a high frequency constant current source, a wire having both ends connected between output ends of a pair of the high frequency constant current source, and the wire In a discharge lamp lighting device comprising one or a plurality of current transformers each using a winding as a primary winding and one or a plurality of lighting loads connected to the secondary windings of each current transformer, The forward line and the return line, which were electrically connected, were placed close to each other in parallel, and the other ends of both lines were connected to the output end of the pair of high-frequency constant current sources. The forward and backward lines are used as primary windings, respectively, and the current transformer is configured by a pair of small current transformers connected in series in a direction in which the secondary windings do not cancel each other, and the secondary windings are connected in series. A discharge lamp is connected to both ends of the circuit.

According to a second aspect of the present invention, in the first aspect of the present invention, the pair of small current transformers are integrated to form a current transformer, and the cores of the small current transformers are freely opened and closed to reciprocate the wiring. They are to be clamped respectively. According to the invention of claim 3, in the invention of claim 1, toroidal cores are used for the cores of the pair of small current transformers, respectively, and the forward and return paths of the wires inserted into the through holes of the cores of the respective small current transformers are used. The wires are brought close to each other at the front and rear positions of the current transformer.

According to a fourth aspect of the invention, in the first aspect of the invention, the E / I core is used as the core of the pair of small current transformers, and the primary winding is formed in the holes on both sides of the middle leg of the E core. A small current transformer is wound around the middle leg through a wire so that it can move. According to a fifth aspect of the present invention, in the first aspect of the present invention, a rotating bobbin is provided in the central portion of the pair of small current transformers, and the bobbin has several turns of forward or backward lines constituting the primary winding. It is wrapped around.

According to a sixth aspect of the invention, in the first aspect of the invention, the wiring is formed in a spiral shape. According to a seventh aspect of the invention, in the first aspect of the invention, one of the two wires constituting the forward and backward paths is arranged in the central portion and the other is formed in a substantially annular cross-section, and is concentric with the central portion line. In this configuration, the wires in the central portion are movably inserted through the central through holes of the core of the small current transformer by using the wirings arranged in the shape of a coaxial line.

[0017]

According to the invention of claim 1, a high frequency constant current source,
A wire whose both ends were connected between the output ends of a pair of high-frequency constant current sources, one or more current transformers using the wires as primary windings, and a secondary winding of each current transformer In a discharge lamp lighting device provided with one or a plurality of lighting loads, a forward line whose one ends are electrically connected to each other,
Use a wiring in which the return line and the return line are parallel and close to each other, and the other ends of both lines are connected to the output end of the pair of high-frequency constant current sources. Since the current transformer is composed of a pair of small current transformers that are used as windings and are connected in series in a direction that does not cancel each other's secondary windings, and a discharge lamp is connected to both ends of the series circuit of the secondary windings, Since the forward and return lines are parallel and close to each other, noise generation from the wiring can be reduced, and the magnetic coupling between the core of the current transformer and the primary winding can be improved, which is particularly large. It is possible to obtain a high secondary voltage capable of reliably starting and lighting the discharge lamp without using the core.

According to the invention of claim 2, in the invention of claim 1, the pair of small current transformers are integrated to form a current transformer, and the cores of the respective small current transformers are opened and closed to reciprocate the wiring. Since each of the wires is clamped, the current transformer can be connected to the wiring after the wiring work is completed, and the workability of the lighting fixture is improved.

According to the invention of claim 3, in the invention of claim 1, toroidal cores are used for the cores of the pair of small current transformers, respectively, and wiring is inserted through the through holes of the cores of the small current transformers. Since the forward and return lines of 1 are brought close to each other at the front and rear positions of the current transformer, the power supply can be performed by expanding the primary side wiring to the minimum extent, so that the generation of noise from the wiring can be further reduced.

According to the invention of claim 4, in the invention of claim 1, the E / I core is used as the core of the pair of small current transformers, and the primary winding is provided in the holes on both sides of the middle leg of the E core. Since the small current transformer is wound around the middle leg so that it can be moved through the constituent wires, the current transformer can be moved freely, which increases the degree of freedom in the installation location of the lighting fixture and improves workability. Moreover, since the primary winding can be wound as one complete turn, the magnetic coupling with the core can be improved, and therefore a high secondary voltage that can reliably start and light the discharge lamp can be obtained.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a rotating bobbin is provided at the center of the pair of small current transformers, and the bobbin has a forward path or a return path for the wiring forming the primary winding. Since the wire is wound for several turns, the magnetic coupling between the primary winding and the core can be further improved, so that the discharge lamp can be reliably started and lit without increasing the size of the core. A high secondary voltage is obtained.

According to the invention of claim 6, in the invention of claim 1, since the wiring is formed in a spiral shape, the current transformer can be moved only by rotating the wiring.
It is possible to easily move the lighting equipment. According to the invention of claim 7, in the invention of claim 1, one of the two wires forming the forward and return paths is arranged in the central portion and the other is formed in a substantially annular cross section, so that the line of the central portion is The wires in the coaxial line structure are arranged concentrically with each other, and the wire at the center is movably inserted into the center through hole of the core of the small current transformer, further reducing noise from the wire. it can.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows a circuit configuration of this embodiment.
In this embodiment, two parallel electric wires are used as the long wiring 4 connecting both ends to a pair of output terminals of the high frequency current source 1.
In other words, the wiring 4 connects one end of each of the forward and backward lines 4A, 4B to the output end of the high frequency constant current source 1 and electrically connects them to each other, and both lines 4A, 4 from one end to the other end.
The coatings of B are mechanically coupled to each other, and the coupling portions are cut open to make respective adjacent outgoing and returning lines 4A,
4B is separated, and each line 4A, 4B of the separation is separated by the core 5A,
5B is inserted as shown in FIG. 2 to form primary windings n _1A and n _{1B of a} small current transformer composed of cores 5A and 5B.

Each of the cores 5A and 5B is composed of a U / I core, and each of the I cores 5a ₁ and 5b ₁ can be opened and closed with respect to the U cores 5a ₂ and 5b ₂ and can be clamped to the wiring 4. Here, U of core 5A, 5B of each small current transformer
The secondary windings n _2A and n _2B wound around the cores 5a ₂ and 5b ₂ are connected in series in opposite directions as shown in FIG. 3 to form a secondary winding of one current transformer CT. A discharge lamp 3 as an illumination load is connected to both ends of the circuit. The current transformer CT is composed of two small current transformers, the primary winding of which is composed of wires 4A and 4B which are inserted through the respective cores 5A and 5B, and the number of turns thereof is each core 5A of each small current transformer. By connecting the secondary windings n _2A and n _2B wound around 5B in series in opposite directions as shown in FIG. 3, an effect equivalent to two turns can be obtained. By making the primary side winding two turns, the magnetic coupling between the core of the current transformer CT and the winding is increased in the present embodiment, and the secondary side that is substantially the theoretical value can be obtained without increasing the size of the core. A voltage can be obtained, and the portion where the wiring 4 on the primary side is separated (not parallel) is reduced, and noise generation from the wiring 4 is also reduced.

Then, the power switch S connected between the high frequency constant current source 1 and the commercial power source Vs is turned on, the high frequency constant current source 1 is operated, and the high frequency current is passed through the wiring 4. A high frequency output is generated on the secondary side. In each of the current transformers CT used in this embodiment, since the magnetic coupling between the core and the winding is improved, it is possible to obtain a sufficient voltage on the secondary side and the lighting load connected to the secondary side. The discharge lamp 3 can be reliably started and lit.

As shown in FIG. 4, two U cores 5a are provided.₂,
5b₂The frame 6₁Fixed to two I cores 5
a₁, 5b₁The frame 5₂Fixed to frame 6₂One end of the frame
6₁It is pivotally supported to open and close with respect to each one core when closed
a₁, 5b₁U core 5a corresponding to each₂, 5b₂of
Bridges are placed between the ends of both legs to form a closed magnetic circuit.
You may ask. In this case the frame 6₂Rotate in the opening direction
U core 5a₂, 5b ₂Open between the legs of each line 4A, 4
B is inserted, and after insertion frame 5₂Turn the closing direction to turn the U
5a₂, 5b₂I core 5a between both legs₁, 5b₁Closed with
Jijiru

Thus, the current transformer as shown in FIG.
Using the CT structure, the primary winding n _1A, N_1BMake up
Easy to clamp forward line 4A and return line 4B of wiring 4.
It is possible to increase the degree of magnetic coupling between the core and the winding.
It works. In addition, the line 4A for the outbound route and the line 4B for the inbound route are clan
The part where the inductance enters in the wiring 4 by
However, the amount of noise is increased and the noise of the entire wiring 4 is reduced.
It

(Embodiment 2) In Embodiment 1, the U / I cores are used as the cores 5A and 5B of the small current transformer constituting the current transformer CT, but this embodiment is as shown in FIGS. A toroidal core is used as the cores 5A and 5B, and the primary winding n _{1A is formed by} inserting the forward line 4A and the backward line 4B of the wire 4 through the through holes of the toroidal cores 5A and 5B. , N _1B . In this case, as shown in FIG. 6, the wire 4 is attached to the cores 5A and 5B made of toroidal cores.
The lines 4A and 4B are separated only at the portions where A and 4B are inserted, but the coated portions of the other lines 4A and 4B are mechanically coupled.

Also in this embodiment, the secondary winding n wound around the cores 5A and 5B of each small current transformer of the current transformer CT.
_2A and n _2B are connected in series in opposite directions to each other, and each core 5A,
The same effect is obtained as when the primary side winding formed by the wires 4A and 4B inserted through 5B has two turns. Thus, also in this embodiment, by making the primary side of the current transformer CT two turns, the magnetic coupling between the core of the current transformer CT and the winding can be increased, and as a result, the core can be miniaturized. In addition, the portion where the primary side wiring 4 is separated (not parallel) becomes small, and noise generation is also reduced.

As shown in FIG. 7, the covering portions of the parallel two wires 4A and 4B of the wiring 4 are used as a fastener structure to move the opening / closing body 7 so that the two parallel wires near the position of the opening / closing body 7 are moved. 4A and 4B can be separated, and cores 5A and 5B made of toroidal cores of a current transformer CT in which wires 4A and 4B are inserted into the opening / closing body 7 respectively.
And the current transformer CT by moving the opening / closing body 7
The position of may be freely set. With such a fastener structure, the installation position of the lighting fixture can be freely set, and the workability can be improved.

(Third Embodiment) In the first embodiment, the U / I core is used as the core of the small current transformer of the current transformer CT, but in this embodiment, as shown in FIGS. 8 and 9, the E / I core is used. As shown in FIG. 13, the central sides of the E cores 5a ₃ and 5b ₃ of the small current transformers are arranged back to back to be integrated, and the E cores 5a ₃ and 5b ₃ on both sides of the middle leg are The wires 4A and 4B corresponding to one of the holes are once inserted from the one surface side to the other surface side and the middle leg is further routed so as to be inserted in the other hole from the other surface side to the one surface side. Enhances the magnetic coupling with. Then, the outgoing line 4A and the incoming line 4B are inserted to form primary windings n _1A and n _1B, and a secondary winding n wound around each of the I cores 5a ₁ and 5b ₁ .
_By connecting _2A and n _{2B in} a manner similar to that of the first embodiment, the same effect as in the case where the number of turns of the primary winding is 2 is obtained, and the magnetic coupling property is improved.

By adopting the above structure, the wires 4A,
Since there is a play between the 4B and the hole of the core to be inserted, the current transformer CT can be freely moved, so that the installation position of the lighting fixture can be freely set and the workability can be improved. (Embodiment 4) In Embodiment 3, the E / I cores are used as the cores of the small current transformers, and the wires 4A and 4B of the wiring 4 are respectively inserted therethrough. In this embodiment, the E / I cores are used as the cores. , But for example, in line 4A as shown in FIG.
A coil bobbin 8 is rotatably inserted around the middle leg of the core 5a ₃ and the wire 4A serving as the primary winding n _1A is wound around the coil bobbin 8 for several turns (1 to 4 turns). With this coil bobbin 8, the primary winding n _1A can be wound and unwound at the same time so that the core 5A can move freely along the wiring 4.

That is, in the present embodiment, the wiring 4 of the current transformer CT constructed by using two small current transformers having the above structure.
Since the wiring 4 is wound several times as the primary windings n _1A and n _1B of each small current transformer, the magnetic coupling between the core and the winding can be further improved. Therefore, it is possible to obtain a secondary voltage that can reliably start and light the discharge lamp 3 connected to the secondary side of the current transformer CT without increasing the size of the core.

Further, as in the first to third embodiments, by making the respective wires 4A and 4B on the primary side parallel, it is possible to reduce the generation of noise from the wiring 4. (Embodiment 5) In the present embodiment, the structure of the wiring 4 on the primary side is similar to that of the coaxial wire in order to reduce noise. That is, as shown in FIG. 11, with the line 4A of the outward path as the central axis, a return line 4B having a C-shaped cross section with the line 4A as the center, and a coaxial line type wiring 4 arranged concentrically, and a line of the return path similarly. 4B as a central axis, a coaxial line type wiring 4 in which a return line 4A having a C-shaped cross section is concentrically arranged on the outside is arranged in parallel and in parallel, and a central line in each wiring 4, for example, a line 4A (or 4B) Is inserted into the central through hole of the core 5 of the small current transformer composed of a toroidal core to connect the core 5 to the line 4B (or 4
Each of them is provided with a small current transformer that is movable in the inner space surrounded by A) along the line 4A (or 4B). Then, the secondary winding n ₂ that can be wound around the core 5 is connected to the wire 4B.
(Or 4A) a secondary winding n of a pair of small current transformers provided on the wiring 4 which is led out to the outside from the notch 10 and is arranged in parallel.
₂ is connected in series in the opposite direction to form a current transformer CT in the same manner as in each of the above embodiments, and the discharge lamp 3 of the lighting fixture to be externally arranged is connected to both ends of the series circuit of the secondary windings n _{2 of the same.} To use.

Thus, in the present embodiment, the noise can be reduced by the outer line 4B (or 4A) in each of the coaxially arranged wirings 4, and the noises can be further reduced by the parallel arrangement. In the current transformer CT composed of two small current transformers, the magnetic coupling between the core and the winding is improved.
It is possible to obtain a secondary voltage that can reliably start and illuminate. Moreover, since the current transformer CT can be moved, the position of the lighting fixture can be set arbitrarily.

Although the wiring 4 in each of the above embodiments is linear, if it is formed in a spiral shape, the current transformer CT using a core having the wiring 4 inserted therein can be moved only by rotating the wiring 4. It will be.

[0037]

According to the invention of claim 1, a high frequency constant current source,
A wire whose both ends were connected between the output ends of a pair of high-frequency constant current sources, one or more current transformers using the wires as primary windings, and a secondary winding of each current transformer In a discharge lamp lighting device provided with one or a plurality of lighting loads, a forward line whose one ends are electrically connected to each other,
Use a wiring in which the return line and the return line are parallel and close to each other, and the other ends of both lines are connected to the output end of the pair of high-frequency constant current sources. Since the current transformer is composed of a pair of small current transformers that are used as windings and are connected in series in a direction that does not cancel each other's secondary windings, and a discharge lamp is connected to both ends of the series circuit of the secondary windings, Since the forward and return lines are parallel and close to each other, noise generation from the wiring can be reduced, and the magnetic coupling between the core of the current transformer and the primary winding can be improved, which is particularly large. There is an effect that a high secondary voltage can be obtained which can surely start and light the discharge lamp without using the core.

According to a second aspect of the present invention, in the first aspect of the present invention, the pair of small current transformers are integrated to form a current transformer, and the cores of the small current transformers are freely opened and closed. I will clamp each to
After the wiring work is completed, the current transformer can be connected to the wiring, which has the effect of improving the workability of the lighting fixture.

According to a third aspect of the present invention, in the first aspect of the present invention, a toroidal core is used for the cores of the pair of small current transformers, respectively, and a forward path of the wiring inserted through the through holes of the cores of the small current transformers. Since the return line is located close to the front and rear positions of the current transformer, the power supply can be performed by expanding the primary wiring by a minimum amount, which further reduces noise generated from the wiring.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the E / I core is used as the core of the pair of small current transformers, and the primary winding is formed in the holes on both sides of the middle leg of the E core. Since the small current transformer is wound around the middle leg so that it can be moved, the current transformer can be moved freely, which increases the degree of freedom in the location of the lighting fixture and improves workability. Since the secondary winding can be wound as one complete turn, the magnetic coupling with the core can be improved, and therefore the effect of obtaining a high secondary voltage that can reliably start and light the discharge lamp is obtained. is there.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a rotating bobbin is provided at the center of the pair of small current transformers, and the bobbin has a forward line or a return line of the wiring forming the primary winding. Since several turns are wound, the magnetic coupling between the primary winding and the core can be further improved,
Therefore, there is an effect that a high secondary voltage can be obtained which can surely start and light the discharge lamp without increasing the size of the core.

According to the invention of claim 6, in the invention of claim 1, since the wiring is formed in a spiral shape, the current transformer can be moved only by rotating the wiring, and the lighting fixture can be easily moved. There is an effect that it becomes possible. The invention of claim 7 is the same as the invention of claim 1,
One of the two wires forming the return path is arranged in the central part and the other is formed in a substantially ring-shaped cross section and arranged concentrically with respect to the central line to use a coaxial line structure, and a small current is used. Since the center line is movably inserted in the center through hole of the transformer core, there is an effect that the generation of noise from the wiring can be further reduced.

[Brief description of drawings]

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

FIG. 2 is an explanatory view of a main part of the above current transformer.

FIG. 3 is a circuit configuration diagram of the above.

FIG. 4 is a perspective view of another example of the above current transformer.

FIG. 5 is a configuration diagram of a second embodiment of the present invention.

FIG. 6 is an explanatory view of a main part of the above current transformer.

FIG. 7 is a partially omitted perspective view of another example of the above current transformer.

FIG. 8 is a configuration diagram of a third embodiment of the present invention.

FIG. 9 is an explanatory view of a main part of the above current transformer.

FIG. 10 is an explanatory view of the essential parts of Embodiment 4 of the present invention.

FIG. 11 is an explanatory diagram of a main part of a fifth embodiment of the present invention.

FIG. 12 is a configuration diagram of a conventional example.

FIG. 13 is a configuration diagram of another conventional example.

FIG. 14 is an explanatory diagram of a main part of the above.

FIG. 15 is a configuration diagram of another conventional example.

FIG. 16 is an explanatory diagram of a main part of the above.

FIG. 17 is an explanatory view of a main part of the above current transformer.

[Explanation of symbols]

 1 High Frequency Constant Current Source 2 Preheating Capacitor 3 Discharge Lamp 4 Wiring 4A, 4B Wire 5A, 5B Core CT Current Transformer

Claims (7)

[Claims] 1. A high frequency constant current source, a wire whose both ends are connected between a pair of output terminals of the high frequency constant current source, and one or a plurality of current transformers using the wire as a primary winding. In a discharge lamp lighting device provided with one or a plurality of lighting loads connected to a secondary winding of a current transformer, a forward line and a return line whose one ends are electrically connected to each other are parallel and close to each other. Then, using the wiring in which the other ends of both wires are connected to the output terminals of the pair of high frequency constant current sources, the forward line and the return line seen from the high frequency constant current source are used as the primary windings, respectively. A discharge lamp lighting device, characterized in that the current transformer is composed of a pair of small current transformers in which secondary windings are connected in series in directions that do not cancel each other, and discharge lamps are connected to both ends of a series circuit of the secondary windings. . 2. The current transformer is formed by integrating the pair of small current transformers, and the cores of the small current transformers are opened / closed and clamped to the reciprocating wires of the wiring. The discharge lamp lighting device described. 3. A toroidal core is used for the cores of the pair of small current transformers, respectively, and forward and backward lines of the wirings inserted through the through holes of the cores of the small current transformers are close to each other at the front and rear positions of the current transformer. The method according to claim 1, wherein
The discharge lamp lighting device described. 4. An E.I core is used as the core of the pair of small current transformers, and a wire forming a primary winding is inserted through the holes on both sides of the middle leg of the E core to form a small current transformer in the middle leg. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is wound so as to be movable. 5. A bobbin that rotates is provided in the center of the pair of small current transformers, and the bobbin is wound with a forward turn or a backward turn of the wiring constituting the primary winding for several turns. Item 1. The discharge lamp lighting device according to item 1. 6. The discharge lamp lighting device according to claim 1, wherein the wiring is formed in a spiral shape. 7. A coaxial line structure in which one of the two wires constituting the forward and backward paths is arranged in the central portion and the other is formed in a substantially annular cross section and arranged concentrically with respect to the central line. 2. The discharge lamp lighting device according to claim 1, wherein the wire at the center is movably inserted into the central through hole of the core of the small current transformer by using the wiring.