JPH04109516U - Transformer for high intensity discharge lamp trigger - Google Patents

Abstract

(57) [Summary] [Objective] To provide a high-intensity discharge lamp trigger transformer having a predetermined insulating resin coating thickness and dielectric strength voltage. [Structure] A coil bobbin 53 has arm pieces 532 and 533 at each end in the axial direction. Arm pieces 532, 533
are arranged adjacent to each other near the outer peripheral surfaces of the winding portions 51 and 52 so as to face each other and protrude from both sides in the radial direction.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a transformer for triggering a high-intensity discharge lamp. At the end, near the outer circumferential surface of the winding section, there are two wires that are opposed to each other and protrude on both sides in the radial direction. By providing each arm piece, the arm piece can be used as a positioning piece when casting insulating resin. High brightness with specified insulation resin coating thickness and dielectric strength voltage. A transformer for triggering a discharge lamp can be obtained.

0002

[Conventional technology]

A high-intensity discharge lamp generates light by discharging it in a gas. Consumes about 1/3 of the power of a halogen lamp, yet emits 3 to 4 times the luminous flux. It is extremely useful as a headlamp for automobiles. high Although brightness discharge lamps have excellent characteristics as mentioned above, in order to turn them on, A high voltage trigger voltage of, for example, 10 to 25 kV must be applied between the electrodes to trigger. Must be. As a means of achieving this, switching DC voltage of about 200 to 500V is used. Then, the switching output is supplied to the trigger transformer to generate a high voltage of about 10 to 25 kV. Obtain the pressure trigger voltage.

0003 FIG. 7 is a circuit diagram for explaining the basic configuration of a high-intensity discharge lamp lighting circuit. In the figure, 1 is a DC power supply, 2 is a control circuit, 3 is a high-intensity discharge lamp, and 4 is a high-voltage generation circuit. 5 is a transformer for triggering a high-intensity discharge lamp, and 6 is a detection circuit.

0004 The DC power supply 1 is generally configured with a battery, a DC/DC converter, etc. It outputs a DC voltage of 200 to 500V necessary to maintain discharge. control times Line 2 switches the DC power supply and converts it to AC, and also outputs the detection signal of the detection circuit 6, e.g. For example, current control, power control, etc. are performed using the current detection signal.

[0005] The high-intensity discharge lamp 3 includes a rare gas inside a tube 31 made of, for example, quartz glass. , mercury, metal halides, etc., and an electric current is generated at a distance inside the tube 31. It has a structure in which poles 32 and 33 are opposed to each other. Such a high intensity discharge lamp 3 is a metal It is called a halide lamp.

[0006] The high voltage generation circuit 4 includes switching elements such as transistors, and a control circuit. The switching operation is performed by a control signal given from line 2.

[0007] The high-intensity discharge lamp trigger transformer 5 has a low-voltage input winding connected in series to the high-voltage generating circuit 4. It has a wire 51 and a high voltage output winding 52. The low voltage input winding 51 and the high voltage output winding 52 The turns ratio changes the voltage input to the low voltage input winding 51 to a voltage of 10 kV to 25 kV. The value is selected to increase the voltage.

[0008] During circuit operation, the voltage obtained by the high voltage generation circuit 4 is applied to the electrode 3 of the high intensity discharge lamp 3. Applied between 2 and 33. This causes arc discharge between the electrodes 32 and 33, A discharge occurs through the gas in the tube 31, and the heat generated by the discharge causes the metal to The halide is vaporized and the maximum amount of light is emitted. After lighting, from control circuit 2 For high-intensity discharge lamp 3, a relatively low switching output voltage is used as a discharge sustaining voltage. It is applied continuously.

[0009]

[Problem that the idea aims to solve]

As mentioned above, the high-intensity discharge lamp trigger transformer has a voltage of about 10kV to 25kV. Since high voltage is applied, it is necessary to ensure a high level of dielectric strength. Ensure dielectric strength As a means to prevent this, it is effective to cover the entire structure with an insulating resin. At that time, please note Mass production is facilitated by casting insulating resin with the trigger transformer placed inside the mold case. It is advantageous to ensure that As a cast case, there are two types: when using an insulated case and when using a separate case. It is assumed that a type case is used. If an insulating case is used, remove the case. Although this is not necessary, it is likely to cause deterioration of thermal cycle characteristics and tracking characteristics. However, it is expected that problems such as the case will be larger and the cost will be higher. Ru. In order to avoid such problems, a release case is used and a caseless structure is used. It is desirable to take However, when casting using a mold release case, the specified thickness The transformer itself has a structure that allows it to reliably form an insulating resin coating with a high There is a need to.

0010 Therefore, the problem of the present invention is to provide a high-luminance product with a predetermined insulating resin coating thickness and dielectric strength voltage. An object of the present invention is to provide a transformer for triggering a discharge lamp.

[0011]

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a coil bobbin and a coil winding on the coil bobbin. a winding section equipped with a coil bobbin, a core coupled to the coil bobbin, and an insulation covering the entire body. A high-intensity discharge lamp trigger transformer comprising a resin, The coil bobbin has arm pieces at each of both ends in the axial direction, Each of the arm pieces faces each other near the outer peripheral surface of the winding portion and has a diameter. Be installed so that it protrudes on both sides of the direction. It is characterized by

0012

[Effect]

The coil bobbin has an arm piece at each end in the axial direction. These are located near the outer circumferential surface of the winding section, facing each other and protruding on both sides in the radial direction. Since the arm piece is attached to the mold release cage when insulating resin is cast, the arm piece can be used as a positioning piece. By positioning it within the base and casting the insulating resin in this state, the entire A thick insulating resin can be reliably applied. For this reason, the specified dielectric strength voltage It is now possible to reliably obtain a high-intensity discharge lamp trigger transformer having the following characteristics.

[0013]

【Example】

Figure 1 is a partially cutaway cross-sectional view of the high-intensity discharge lamp trigger transformer according to the present invention, and Figure 2 is the same. Figure 3 is a left side view of Figure 1, and Figure 4 is a right side view of Figure 1. FIG. 50 is a core, 51 is a low voltage input winding, 52 is a high voltage output winding, 53 is a The coil bobbin, 54 is an interlayer insulating layer, and 55 is an insulating resin.

[0014] The core 50 is inserted into the inner diameter portion of the coil bobbin 53. The illustrated core 50 is Both ends are open ends, forming an open magnetic path. However, U-U type, UI A closed magnetic circuit may be formed by a core of type, E-E type, or E-I type.

[0015] The low voltage input winding 51 and the high voltage output winding 52 constitute a winding section. High voltage output winding The wire 52 is wound around a coil bobbin 53, and the low voltage input winding 51 is a high voltage output winding. 52. 511 and 512 are lead terminals of the low voltage input winding 51; 521 and 522 are lead terminals of the high voltage output winding 52.

[0016] The coil bobbin 53 is made of insulating resin with excellent withstand voltage characteristics, and has an inner diameter hole 5. 30 and is provided with a winding frame portion 531 formed in a cylindrical shape. on top of the winding section 531 As mentioned above, the high voltage output winding 52 and the low voltage input winding 51 are wound in sequence. There is. Arm pieces 532 and 533 are provided at each end of the winding frame portion 531 in the axial direction. Each of the arm pieces 532 and 533 has a low voltage input winding 5 constituting a winding section. near the outer peripheral surface of 1, facing each other and protruding from both sides in the radial direction. It is. The upper surfaces (in the figure) of the arm pieces 532 and 533 are located on almost the same plane. , are formed to protrude with approximately the same length. At approximately the center of the arm piece 532, A cable attachment hole 57 having a slit 56 is provided. A high voltage cable 58 is attached to 7. The high voltage cable 58 is the high voltage line 5 81 is covered with an insulating coating 582.

[0017] The inner diameter hole 530 of the coil bobbin 53 has one end (the right side in FIGS. 1 and 2). It comes out in a straight shape, and a receiving plate 534 is provided at the other end. Core 50 is The end portion of the coil bobbin 53 is prevented from coming out from the inner diameter hole 530, and the inside of the coil bobbin 53 is It is located in This relieves stress when filling the insulating resin 6. . A hole 535 is provided in the center of the receiving plate 534, and a hole 536 is provided on the outside thereof. Ru. A conductive plate 59 having spring properties is arranged on the receiving plate 534 . This conductive plate 5 9 is led out to the outside of the inner diameter hole 530 through a hole 536 provided in the receiving plate 534. , connected to the high voltage line 581 of the high voltage cable 58 by means such as soldering. There is. With the above structure, the core 50 passes through the conductor plate 59 and the high voltage cable 58. It is kept at the same potential as the output voltage. Moreover, since the conductor plate 59 has spring properties, the core It is definitely in contact with 50.

[0018] Referring to FIGS. 2 and 4, a slit 5 opening to the outside is provided at the center of the arm piece 534. 37 are provided. The lead terminal 521 of the high voltage output winding 52 is connected to this slit 5. 37 to the outside. The slit 537 is the outermost part of the high voltage output winding 52. It is provided so that it reaches inside than the circumference. Furthermore, inside the slit 537 A window-shaped hole 53 is provided in the region where the end face of the high-voltage output winding 52 is located. It has 8.

[0019] The insulating resin 6 is provided to cover the entire structure. Insulating resin is shown in Figures 5 and 6. The casting process is shown. As shown in the figure, a trigger according to the present invention is provided inside the mold release case 8. Place the transformer and cast insulating resin as shown by arrow a. Here, coil Bobi The arm 53 has arm pieces 532 and 533 at each end in the axial direction. 32 and 533 are connected to each other in the vicinity of the outer peripheral surface of the winding portions 51 and 52. Since they are installed so that they face each other and protrude on both sides in the radial direction, when casting insulating resin, The arm pieces 532 and 533 are used as positioning pieces to hang on the edge of the side plate 81 of the release case 8. It is held in place and positioned within the mold release case 8, and insulating resin is poured in this state. this As a result, the insulating resin 6 having a predetermined thickness is reliably formed over the whole, and a predetermined dielectric strength voltage is achieved. It is possible to obtain a transformer for a high-intensity discharge lamp trigger having the following.

[0020] The trigger transformer shown in the embodiment is located within the area where the end face of the high voltage output winding 52 is located. has a hole 538 cut out in the shape of a window, so that the high voltage output winding 5 can be passed through the hole 538. 2 is also reliably filled with insulating resin, improving dielectric strength.

[0021] Moreover, the inner diameter hole 530 of the coil bobbin 53 has one end pulled out in a straight shape. Since a hole 535 is provided in the center of the receiving plate 534 on the other end side, the coil bobbin The insulating resin is also reliably filled around the core 50 inside the inner diameter portion 530 of the tube 53. As a result, the core 50 is reliably integrated with the coil bobbin 53.

[0022] The high voltage output winding 52 has an inductance value in the range of 100 μH to 4 mH. It is desirable to set it to . Uses an open magnetic path type core 50 with both ends open. In the case of the embodiment described above, by setting the number of turns to 48 to 280 turns, the above Inductance value can be secured. As mentioned above, the inductor of the high voltage output winding 52 If the impedance value is set in the range of 100 μH to 4 mH, the secondary impedance will be low. As a result, the blunting of the high-voltage pulse voltage waveform is suppressed, and the distance between the high-intensity discharge lamp 3 and Impedance matching becomes easier and the high-intensity discharge lamp 3 lights up efficiently and quickly. can.

[0023] The high voltage output winding 52 extends from one end of the coil bobbin 53 in the axial direction toward the other end. Interlayer winding in which coil layers that are continuously wound in alignment are laminated with an insulating layer 54 in between. It has become. According to interlayer winding, an insulating film, etc. is used between each layer to achieve high electrical insulation. It is possible to form a thin insulating layer 54, and it is possible to form a continuous insulating layer 54 around the coil layer between the insulating layers 54. Compared to section winding, it is possible to release the edge resin and improve dielectric strength. This makes it possible to ensure high dielectric strength.

[0024] Further, the high voltage output winding 52 is wound around the coil bobbin 53, and the low voltage input winding is placed on top of the high voltage output winding 52. 51, the high voltage output winding 52 with a high potential is connected to the low voltage input winding with a low potential. It has a winding structure covered by the wire 51, which facilitates electrical insulation and also reduces the The dielectric strength characteristics with respect to the outside of the lance become even better.

[0025]

[Effect of the idea]

As mentioned above, the coil bobbin of the high-intensity discharge lamp trigger transformer according to the present invention The winding has an arm piece at each end in the axial direction, and each arm piece is attached to the winding part. They are arranged so that they face each other near the outer peripheral surface and protrude on both sides in the radial direction. Therefore, when casting the insulating resin, use the arm piece as a positioning piece and place the specified insulating resin coating. It is possible to provide a transformer for triggering a high-intensity discharge lamp that has a good thickness and withstand voltage.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of a transformer for triggering a high-intensity discharge lamp according to the present invention.

FIG. 2 is a partially cutaway sectional view of the high-intensity discharge lamp trigger transformer according to the present invention at another position.

FIG. 3 is a left side view of the high-intensity discharge lamp trigger transformer shown in FIG. 1;

4 is a right side view of the high-intensity discharge lamp trigger transformer shown in FIG. 1. FIG.

FIG. 5 is a diagram showing an insulating resin casting process for a high-intensity discharge lamp trigger transformer according to the present invention.

FIG. 6 is a diagram showing an insulating resin casting process for a high-intensity discharge lamp trigger transformer according to the present invention.

FIG. 7 is a circuit diagram for explaining the basic configuration of a high-intensity discharge lamp lighting circuit.

[Explanation of symbols]

50 cores 51 Low voltage input winding 52 High voltage output winding 53 Coil bobbin 532, 533 arm piece

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Masahiro Gamo Tei, 1-13-1 Nihonbashi, Chuo-ku, Tokyo -Within DK Co., Ltd. (72) Creator Atsushi Yakuwa Tei, 1-13-1 Nihonbashi, Chuo-ku, Tokyo -Within DK Co., Ltd.

Claims (4)

[Scope of utility model registration request] 1. A high-intensity discharge lamp triggering transformer comprising a coil bobbin, a winding portion wound around the coil bobbin, a core coupled to the coil bobbin, and an insulating resin covering the entire body, the transformer comprising: The coil bobbin has arm pieces at each of both ends in the axial direction, and each of the arm pieces is arranged adjacent to the outer peripheral surface of the winding portion so as to face each other and protrude on both sides in the radial direction. A transformer for high-intensity discharge lamp triggers. 2. The winding section includes a high-voltage output winding and a low-voltage input winding, and the high-voltage output winding has an inductance value in a range of 100 μH to 4 mH, and is connected to one end of the coil bobbin in the axial direction. It has a structure in which coil layers are arranged and wound continuously from one end to the other end, and are laminated with an insulating layer interposed therebetween, and the low voltage input winding is wound on top of the high voltage output winding. The transformer for triggering a high-intensity discharge lamp according to claim 1, characterized in that: 3. The transformer for triggering a high-intensity discharge lamp according to claim 1, wherein both ends of the core are open, forming an open magnetic path. 4. The transformer for triggering a high-intensity discharge lamp according to claim 1, wherein the core constitutes a closed magnetic path.