JP2001155942A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a transformer and reduce the size of the transformer, while enabling the transformer to fully exhibit it s performance by improving the integrity between primary and secondary coils. SOLUTION: This transformer is constituted of a bobbin which has a shaft section, wound with a secondary coil and another shaft section wound with a primary coil on the outer periphery of the secondary coil and is formed in a three-dimensional shape, so that the shaft sections are coupled with each other by their one end sections and a core which is inserted into the hollow shaft of the bobbin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an HID (High I
The present invention relates to a transformer used for a lamp lighting device or the like.

[0002]

2. Description of the Related Art Recently, a printed circuit board on which a lighting circuit and a transformer are mounted is housed in a case provided with a socket to which a HID lamp can be detachably mounted, and the inside of the case is filled with a hardening insulating resin. As a result, an HID lamp lighting device integrated into a unit has been developed (see Japanese Patent Application Laid-Open No. H11-87156).

Conventionally, for example, in such an HID lamp lighting device, in order to simplify and downsize a transformer incorporated in the case, FIG.
As shown in FIG. 2, a transformer having a structure in which a primary coil 26 and a secondary coil 27 are wound in parallel around a shaft portion of one bobbin 25 in which a core 24 is inserted inside a hollow shaft is used. I have to.

[0004]

The problem to be solved is that in a transformer structure in which a primary coil and a secondary coil are wound in parallel around the shaft of one bobbin, one problem is encountered. The coupling between the secondary coil and the secondary coil is poor,
That is, the performance as a transformer is reduced.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a transformer.
In order to simplify and reduce the size of the structure without deteriorating the performance due to poor coupling between the secondary coil and the secondary coil, the shaft around which the secondary coil is wound and the outside of the secondary coil are used. A shaft around which the primary coil is wound,
A transformer is constituted by a three-dimensionally formed bobbin such that the respective shaft portions are coupled at one end, and a core inserted into the hollow shaft of the bobbin.

Further, the present invention aims at simplifying the structure and reducing the size of the bobbin shaft without reducing the coupling between the primary coil and the secondary coil of the transformer and deteriorating the performance. , A primary coil wound around the concave portion of the bobbin shaft, and a primary coil wound around the concave portion.
A secondary coil wound around the bobbin shaft from above the secondary coil,
The transformer is constituted by the core inserted into the hollow shaft of the bobbin.

Further, the present invention provides a transformer in a case to simplify and reduce the size of the transformer without deteriorating the performance due to poor coupling between the primary coil and the secondary coil of the transformer. In the case of a mold type device in which the inside of the case is filled with curable insulating resin, a core with a rod-shaped core whose surface is coated with a material compatible with the insulating resin is provided inside the case. And a secondary coil is wound around a core regulated by a secondary coil position regulating portion provided in the case, and a position of a primary coil provided in the case around the outer periphery of the secondary coil. A primary coil is wound around the restricting portion to constitute a bobbinless transformer.

[0008]

1 and 2 show an example of the configuration of an HID lamp lighting device incorporating a transformer according to the present invention.

Here, the HID lamp lighting device is:
The HID lamp 4 is directly inserted into a housing consisting of a case 1 having a HID lamp insertion hole 3 provided on one side thereof and having an opening, and a case 2 which fits into the case 1 and closes the opening, and is electrically connected. A valve cap 5 to be connected, a circuit element 6 of the HID lamp lighting circuit, and a board 6 to which a transformer 7 is attached and busbar wiring is incorporated, and the housing is filled with a hardening insulating resin to thereby form the HID. The lamp 4, its lighting circuit and the transformer 7 are integrally unitized.

At this time, by fitting the case 1 and the case 2, the valve cap 5 is assembled at a predetermined position in the housing.

As shown in FIGS. 3 and 4, a groove 51 is formed in the rear end of the valve cap 5 in a circular shape, and is formed in the groove 51 so as to protrude in a circular shape toward the case 2. The protrusion 201 is inserted. A chamber 52 for receiving the tip of the HID lamp 4 is formed at the tip of the bulb cap 5, and a wall 53 of the chamber 52 is formed on a projection 101 provided to project toward the case 1. It is designed to be inserted into the groove 102.

By taking such an assembling structure of the case 1 and the case 2 and the valve cap 5, a labyrinth structure is formed between the low-pressure portion and the high-pressure portion, and the creepage distance is increased to improve the insulation effect. I do.

A chamber 54 is formed at the rear end portion of the bulb cap 5, and the chamber 54 communicates with the chamber 52 formed at the front end portion for receiving the front end portion of the HID lamp 4. A hole 55 at the tip of the HID lamp 4 is formed for receiving a high-pressure lead.

The bulb cap 5 is provided with a lead-out portion 56 for the high-voltage terminal 8 at the hole 55, and the high-voltage lead at the tip of the HID lamp 4 inserted into the hole 55 is connected to the high-voltage terminal 8. The electrical connection is made by being inserted into the hole 81. The high voltage terminal 8 is connected to the secondary output side of the transformer 7.

Further, the connector 9 is assembled at a predetermined position in the housing by fitting the case 1 and the case 2 together. The connector 9 has a high-voltage terminal, a low-voltage terminal, and a ground terminal drawn out.

The case 1 has an insulating pipe 1 from which a connection portion 10 of a ground-side lead of the HID lamp 4 is drawn out.
1 is attached.

FIG. 5 shows that when the lighting switch is turned on, a high-voltage terminal H is connected to the high-voltage terminal H under the control of the control circuit.
A high voltage of about 0 V is applied to generate a high voltage pulse on the secondary side of the transformer 7 to start lighting of the HID lamp 4 connected to the secondary side, and the voltage applied to the HID lamp 4 is controlled by the control circuit. Is adjusted to about 85 V, and a configuration example of an HID lamp lighting circuit in which the HID lamp 4 is stably lit by directly applying the voltage from the low voltage terminal L through the secondary side of the transformer 7 is shown.

According to the present invention, a transformer 7 incorporated in such an HID lamp lighting device is provided with a hollow shaft portion 731 around which a secondary coil 72 is wound as shown in FIGS.
And a shaft portion 732 around which the primary coil 71 is wound around the outer periphery of the secondary coil 72.
A bobbin 73 formed three-dimensionally so that the first and second parts 732 are coupled at one end thereof, and a shaft 73
1 and a ferrite core 74 inserted into the hollow interior. In this case, an air-core coil is used as the secondary coil 72.

However, in the transformer 7 configured as described above, one bobbin 73 has the primary coils 71 and 2 connected thereto.
When the secondary coil 72 is wound, the primary coil 71 and the secondary coil 72 are coaxially arranged, so that the coupling between the primary coil 71 and the secondary coil 72 is improved, and sufficient transformer performance is achieved. , While effectively simplifying and miniaturizing the structure.

FIG. 7 shows another configuration example of the transformer according to the present invention.

Here, the transformer is a hollow shaft 121.
, A primary coil 14 wound in the concave portion 13, and a shaft portion 12 of the bobbin 12 from above the primary coil 14 wound in the concave portion 13.
1 and a ferrite core 16 inserted into the hollow portion of the shaft portion 121 of the bobbin 12.

In this case, a concave portion 17 is formed in the shaft portion 121 of the bobbin 12 corresponding to the portion of the secondary coil 15 on the high voltage side, and the concave portion 17 is filled with an insulating resin 18 such as epoxy. To increase the insulation resistance of the high voltage part.

Even in this case, even if the primary coil 14 and the secondary coil 15 are wound around one bobbin 12, the connectivity between the primary coil 14 and the secondary coil 15 is improved. While exhibiting sufficient transformer performance, the structure can be simplified and downsized effectively.

8 to 10 show other examples of the configuration of the transformer according to the present invention.

In this case, there is a mold-type device in which the transformer 19 is put in a case 20 and the inside of the case 20 is filled with a hardening insulating resin. The rod-shaped core 21 coated with a powdered material (painted portion 22) is accommodated in a core installation portion 201 provided in the case 20, and is regulated by a secondary coil position regulation portion 202 provided in the case 20. The secondary coil 15 is wound around the core 21 to be formed, and the primary coil 14 is wound around the primary coil position regulating section 203 provided in the case 20 around the secondary coil 15. , A bobbinless transformer 19. The primary coil 14 and the secondary coil 1
5, an insulating layer 23 made of epoxy resin is provided.

In this case, the coupling between the primary coil 14 and the secondary coil 15 is improved and sufficient transformer performance is exhibited. It is possible to achieve more effectively.

[0027]

As described above, the present invention has a shaft portion around which a secondary coil is wound and a shaft portion around which a primary coil is wound around the secondary coil, and each shaft portion has one end. And a core inserted into the hollow shaft of the bobbin to form a transformer. The connection between the primary coil and the secondary coil However, there is an advantage that simplification and downsizing of the structure can be effectively achieved while exhibiting sufficient transformer performance by improving the performance.

Further, the present invention provides a bobbin in which a recess is formed in a part of the bobbin shaft, a primary coil wound in the recess of the bobbin shaft, and a primary coil wound in the recess. The transformer is constituted by the secondary coil wound around the bobbin shaft and the core inserted inside the hollow shaft of the bobbin, and the coupling between the primary coil and the secondary coil is improved. While exhibiting sufficient transformer performance, there is an advantage that the structure can be simplified and downsized effectively.

Further, the present invention relates to a mold-type device in which a transformer is placed in a case and the inside of the case is filled with a hardening insulating resin, and the surface is coated with a material compatible with the insulating resin. Into the core installation portion provided in the case, a secondary coil is wound around the core regulated by the secondary coil position regulation portion provided in the case, and the secondary coil is wound. A transformer is formed by winding a primary coil around a primary coil position regulating portion provided in a case around the outside of the case, and the coupling between the primary coil and the secondary coil is improved. In particular, by providing a bobbin-less structure, there is an advantage that the structure can be simplified and the size can be reduced more effectively.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a configuration example of an HID lamp lighting device in which a transformer according to the present invention is incorporated.

FIG. 2 is a side sectional view of a transformer portion of the HID lamp lighting device in the configuration example.

FIG. 3 is a front sectional view of a valve cap used in the HID lamp lighting device of the same configuration example.

FIG. 4 is a right side view of the valve cap.

FIG. 5 is an electric circuit diagram showing a configuration example of an HID lamp lighting circuit.

FIG. 6 is a front sectional view showing an embodiment of a transformer according to the present invention.

FIG. 7 is a front sectional view showing another embodiment of the transformer according to the present invention.

FIG. 8 is a front sectional view showing still another embodiment of the transformer according to the present invention.

FIG. 9 is a plan view of a transformer in the embodiment.

FIG. 10 is a right side sectional view of the transformer in the embodiment.

FIG. 11 is a front sectional view showing a configuration example of a conventional transformer.

FIG. 12 is a front sectional view showing another configuration example of a conventional transformer.

[Explanation of symbols]

 7 transformer 71 primary coil 72 secondary coil 73 bobbin 74 ferrite core 12 bobbin 13 recess 14 primary coil 15 secondary coil 16 ferrite core 17 recess 18 insulating resin 19 transformer 20 case 201 core installation section 202 secondary coil position regulating section 203 Primary coil position regulating unit 21 core

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01F 31/06 501C

Claims (4)

[Claims] 1. A shaft around which a secondary coil is wound, and a shaft around which a primary coil is wound around an outer periphery of the secondary coil, wherein each shaft is connected at one end. A transformer comprising a three-dimensionally formed bobbin and a core inserted inside a hollow shaft of the bobbin. 2. A bobbin having a recess formed in a part of the bobbin shaft, a primary coil wound around the recess of the bobbin shaft,
A transformer comprising a secondary coil wound around a bobbin shaft from above a primary coil wound around the recess, and a core inserted inside the hollow shaft of the bobbin. 3. The transformer according to claim 2, wherein a recess is separately formed on the bobbin shaft corresponding to the high voltage side portion of the secondary coil, and the recess is filled with an insulating resin. 4. A mold-type device in which a transformer is placed in a case and the inside of the case is filled with a hardening insulating resin, and a stick-shaped device having a surface coated with a material having affinity for the insulating resin is provided. The core is placed in a core installation portion provided in the case, and a secondary coil is wound around the core regulated by the secondary coil position regulation portion provided in the case,
A transformer configured by winding a primary coil around a primary coil position regulating portion provided in a case around the secondary coil.