JP2008034129A - Discharge lamp lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device small in size and suitable for mass production. <P>SOLUTION: The discharge lamp device has a socket into which a discharge bulb is inserted and an ignitor part which is connected to the socket and is equipped with a transformer having a primary winding, a secondary winding, and a core. The ignitor part comprises an ignitor frame body having a bottomed hollow part and the transformer which is constructed by inserting respectively the primary winding in the outer circumference and the secondary winding including the core in the inner circumference of the ignitor frame. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device used for a headlight of an automobile or the like.

  In recent years, high-intensity discharge lamps have been used for automobile headlamps and the like. In such a discharge lamp, an igniter is connected to the socket of the discharge lamp, and this igniter requires a transformer having a relatively large volume. This transformer is structured to be stored in a space such as a lamp base.

  For example, in Patent Document 1, a transformer in which a primary winding and a secondary winding are separated using a resin bobbin is used, and the transformer is housed in a box-shaped portion of a case.

However, with such a structure, there is a problem in that a transformer is once manufactured and stored in a case, and as a lighting device becomes large, the manufacturing process increases and costs increase. .
JP 2005-72010 A

  The present invention has been made in view of the problems of the conventional discharge lamp lighting device as described above, and an object of the present invention is to provide a discharge lamp lighting device that is small and suitable for mass production.

  According to claim 1 of the present invention, there is provided a discharge lamp device having a socket into which a discharge bulb is inserted and an igniter section connected to the socket and including a transformer composed of a primary winding, a secondary winding and a core. The igniter portion is configured by inserting an igniter frame body having a bottomed cavity portion, the primary winding on the outer periphery of the igniter frame body, and the secondary winding including a core on the inner periphery. Disclosed is a discharge lamp lighting device comprising a transformer.

  According to the present invention, it is possible to obtain a discharge lamp lighting device that is small and inexpensive, or that is the same size, inexpensive, high output, and excellent in startability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As will be described later, one of the features of the present invention is the structure of a socket into which a discharge bulb is inserted and an igniter transformer connected to the socket.

  In order to facilitate understanding of the invention, an electric circuit of a discharge lamp lighting device will be described before describing the details of the features of the embodiment of the present invention.

  In FIG. 1, reference numeral 11 denotes a DC voltage source, and the voltage of the voltage source 11 is supplied to a DC / DC converter 12. In the DC / DC converter 12, the voltage of the DC voltage source 11 is boosted to about 360V to 400V, for example. The boosted voltage is supplied to the DC / AC inverter 13, and a rectangular wave is generated by performing a switching operation of several hundred Hz in a full bridge circuit using four switching elements, for example.

  A control circuit 14 obtains power from the output current I and voltage V generated by the DC / AC inverter 13 and controls the power generated by the DC / DC converter 12 to be constant at 35 W, for example. The DC / DC converter 12, the DC / AC inverter 13, and the control circuit 14 constitute an inverter 15.

  The inverter 15 outputs DC voltages of 400 V and 1 kV, for example. In the inverter 15, the DC / AC inverter 13 transmits 400 V to the igniter unit 17 using the power supply lines 161 and 162. Further, the DC / DC converter 12 transmits 1 kV to the igniter unit 17 using the feeder line 163. The power supply lines 161 to 163 are all shielded together, or the power supply lines themselves are shielded.

  Reference numeral 18 denotes a socket that is integrally formed with the igniter portion 17 and is fitted with, for example, a HID bulb 19 that is a discharge bulb, and supplies a high-voltage pulse voltage generated by the igniter 17. An example of an electric circuit diagram of the igniter 17 shown in FIG. 1 is shown in FIG.

  That is, 211 to 213 are connection terminals electrically connected to the power supply lines 161 to 163 taken out from the inverter 15, the connection terminal 211 is the power supply line 161, the connection terminal 212 is the power supply line 162, and the connection terminal 213. Are respectively connected to the feeder line 163. The connection terminal 211 is connected to one end of the capacitor C1, and is also connected to one end of the secondary winding of the open magnetic circuit type transformer TR formed of an elongated core.

  The connection terminal 212 is connected to the other end of the capacitor C1, and to one end of the primary winding n1 of the capacitor C2 and the transformer TR. The connection terminal 213 is connected to the other end of the capacitor C2 and is connected to the other end of the primary side winding of the transformer TR through the discharge gap 22. The other end of the secondary winding n2 of the transformer TR is connected to one electrode of the HID valve 19 via the socket 18, and the connection terminal 212 is connected to the other electrode of the HID valve 19 via the socket 18.

  The socket 18 of the igniter portion 17 has a shape that can be directly fitted to the base of the HID valve 19, and the transformer TR is disposed at the end of the socket 18. The inverter 15 is housed in a metal case and magnetically shielded. The igniter unit 17 is magnetically shielded, for example.

  The HID valve 19 and the igniter 17 are structurally as shown in FIG. The feeder lines 161, 162, and 163 are connected to the igniter unit 17 through the input connector 32. FIG. 4 shows the structure of the igniter portion 17 of this apparatus, and FIG. 5 shows a side view of the apparatus shown in FIG.

  FIG. 6 shows a state where the core and the secondary winding wound around the core are not inserted in the cross section taken along the line AA of the discharge lamp device shown in FIG. In other words, the igniter frame 61 has a bottomed cavity 62 whose axis is directed laterally with respect to the direction of the HID valve 19 and a bottomed cavity 62 provided around the cavity 62 via a partition wall 63. The structure has a primary winding groove 64. A primary winding n1 of the transformer TR is inserted into the primary winding portion 64. The cavity 62 has a cylindrical shape and has a tapered structure in which the bottom is slightly narrower than the entrance.

  FIG. 7 shows a cross-sectional perspective view of the discharge lamp device shown in FIG. In the cavity 62 of the igniter frame 61, a cylindrical rod-shaped core 66 is inserted around the cavity 62 and inserted into the secondary winding n2, and a high potential terminal of the secondary winding n2. Inserted with the side facing away. FIG. 4 is a perspective view of the state in which the secondary winding n2 and the rod-shaped core 66 are inserted.

  A transformer TR is configured by the secondary winding n2 wound around the rod-shaped core 66 and the primary winding n1 provided in the primary winding groove 64 of the igniter frame 61. The rod-shaped core 66 is made of, for example, NiZn (nickel zinc).

  In this way, the primary winding n1 of the transformer TR is integrally provided on the igniter frame 61, and the transformer TR is formed integrally with the igniter simply by inserting the secondary winding n2 and the rod-shaped core 66 into the cavity 62. .

  In a conventional discharge lighting device, a primary winding and a secondary winding are separated using a resin bobbin, and this transformer is housed in a box-shaped portion. In this case, an independent bobbin is required, the number of members is large, and the bobbin case is separated, so that insulation at the end face cannot be expected, and the insulation structure depends on the adhesiveness of the encapsulating resin. ing.

  On the other hand, according to the configuration of this embodiment of the present invention, assembling becomes easy and reliable isolation of high potential can be achieved at the same time, and high potential leakage due to peeling of the filling resin is surely suppressed. And reliability is improved. After all, according to this embodiment, safety and reliability can be improved without depending on the adhesive strength of the filling resin. It also contributes to cost reduction and reduction in size and weight by reducing the number of members.

  FIG. 8 is a perspective view of the igniter portion 17 as viewed obliquely from below, FIG. 9 is a perspective view of the igniter portion 17 as viewed from the left side upside down, and FIG. It is the perspective view seen from the fitting surface with the socket. 8 and 9, reference numeral 81 is a surface facing the coupling surface with the HID valve 19, and reference numeral 82 is a rod-shaped core 66 of the transformer TR and an insertion surface of the drive circuit.

  As described above, the fitting direction of the HID valve 19 and the storage opening of the rod-shaped core 66 and the driving component are provided on the same surface or a surface other than the opposing surface.

  In the conventional discharge lamp lighting device, it is necessary to install many uneven fittings in the case portion and the lid portion, which is disadvantageous in terms of space and weight. In addition, the mold structure is complicated and disadvantageous in terms of cost. Furthermore, it is necessary to support a high voltage with a very thin resin wall, which is disadvantageous in terms of reliability and durability.

  On the other hand, according to the structure of the embodiment of the present invention, since there is no opposing potential on the same surface, it is possible to achieve both high potential and reliable isolation without providing a complicated structure. High potential leakage due to cracks or the like can be reliably suppressed and reliability can be improved. Therefore, although it is a simple molding, safety and reliability can be improved, and there is an advantage that it contributes to a reduction in size and weight.

  FIG. 11 is a side view of the discharge lamp lighting device of this embodiment, FIG. 12 is a cross-sectional view taken along line AA in FIG. 11, and FIG. 13 is a perspective view of this cross-sectional portion.

  The secondary winding n2 having a space in which the rod-shaped core 66 can be inserted is inserted into the bottomed cavity 62, but the back of the secondary winding n2 becomes the high potential terminal portion 121, and the vicinity of the opening is The low potential terminal portion 122 is formed. Reference numeral 123 denotes a bus bar integrally formed with the igniter frame 61 and connected to the secondary winding n2. Thus, since the high potential terminal portion 121 of the secondary winding n2 is connected to the bus bar 123 at a position recessed from the outside, it can withstand a high voltage.

  The conventional discharge lamp lighting device has a structure in which the opening in the storage space for the transformer and drive parts is stored from the side of the transformer. For this reason, the high potential portion at the end portion has a depth substantially equal to that of the low potential portion at the other end, and the insulation to the periphery depends on the adhesive force of the encapsulated resin. Therefore, high potential leakage may occur due to peeling or cracking of the encapsulating resin, mixing of voids at the time of encapsulating, or the like.

  On the other hand, according to this embodiment of the present invention, as shown in FIG. 12, the high potential terminal portion 121 is located on the bottom surface of the cavity portion 62 into which the rod-shaped core 66 and the secondary winding n2 are inserted. In addition, the opening of the cavity 62 has a depth corresponding to the entire length of the transformer. Therefore, even if the encapsulating resin is peeled off or cracked, there is an advantage that high potential leakage can be surely suppressed and reliability is improved. In the end, this structure of one embodiment of the present invention can improve safety and reliability while contributing to a reduction in size and weight while being simple.

  FIG. 14 is a cross-sectional view of the discharge lamp lighting device according to this embodiment including the HID bulb 19 and the igniter portion 17, and FIG. 15 is an enlarged cross-sectional view of the igniter portion 17 of the lighting device of FIG. FIG. 16 is a perspective view of a portion forming the transformer TR in the sectional view shown in FIG.

  The secondary winding n2 and the rod-shaped core 66, which are inserted into the igniter frame 61, are put into a cavity 62 having a cylindrical bottomed opening.

  Thus, the high potential terminal portion 121 of the secondary winding n2 wound around the rod-shaped core 66 is inserted in the direction perpendicular to the fitting direction with the socket 18 of the HID valve 19 in the back. The cavity 62 into which the rod-shaped core 6 is inserted has a substantially cylindrical shape. Although not shown, as will be described later, the end of the secondary winding is connected to the bus bar 151 and is connected to the socket-side electrode of the discharge bulb 19.

  In the conventional discharge lamp lighting device, the opening in the storage space for the transformer and driving parts is structured to be stored from the side of the transformer. Therefore, when enclosing a transformer having an oval or perfect circular cross section with resin, at least the opening surface side becomes a square shape, and an amount of encapsulating resin that creates this gap is required.

  On the other hand, according to the above-described structure of the present invention, it is possible to provide a storage portion having the same outer shape with respect to the transformer shape having a round cross section, and in the conventional structure, excessive resin generated in the corner portion is reduced. There are advantages that can be made.

  In the description of the above embodiment, the hollow section has a circular cross section, but may have a shape such as an ellipse.

  FIG. 17 is a partially cutaway perspective view of the igniter portion 17 completed in the embodiment of the present invention, and FIG. 18 is a perspective view of a cross section cut at the center of the rod-shaped core. FIG. 19 is a cross-sectional view cut at the center of the rod-shaped core. As shown in FIG. 17, a cover 171 is fixed around the igniter portion 17. A small-diameter inlet 172 is provided on the front surface of the cover 171 corresponding to the central axis of the rod-shaped core. After the secondary winding n2 and the rod-shaped core 66 are inserted into the cavity 62 and the cover 171 is attached, resin for sealing is injected from the injection port 172.

  Thus, the injection port 172 is provided in the portion corresponding to the central axis of the rod-shaped core 66 of the cover of the igniter portion, and the resin is injected and sealed from the injection port 172.

  In the conventional discharge lamp lighting device, the opening in the storage space for the transformer and drive parts is structured to be stored from the side of the transformer. There is a possibility that high potential leakage may occur due to peeling or cracking of the encapsulating resin or mixing of voids at the time of encapsulating, and it is necessary to cover the injection port of the encapsulating resin with a case material.

  On the other hand, according to the above-described structure of the present invention, the NiZn core, which is a very strong insulator, is located at the front of the injection port of the encapsulating resin. It is no longer necessary to cover with wood. Therefore, although it is simple molding, it can improve safety and reliability, and contributes to reduction in size and weight. In addition, the resin can be injected after the case assembly is completed, and there is an advantage in process control.

  FIG. 20 shows a side view of the igniter portion 17 of this embodiment of the present invention with the secondary winding n2 inserted into the cavity portion 62 and the rod-shaped core 66 removed. FIG. 21 shows a cross-sectional view taken along the line CC in FIG. 20, and the CC part in a state in which the rod-shaped core 66 is inserted into the secondary winding n2, the primary winding n1, and the primary winding n1. FIG. 22 is a sectional view taken in the opposite direction.

  At the bottom of the cavity 62, for example, a bus bar 123 having a bent shape having a terminal 201 connected to a high-voltage side terminal of the secondary winding n2 using a rectangular winding is provided in the igniter frame 61 by integral molding. It is done. As described above, the bus bar 123 is connected to the bus bar 151 shown in FIG. 15 and is connected to the socket 18 of the HID valve 19.

  The secondary winding n2 and the bus bar 123 are connected by welding from the hollow portion 62 into which the rod-shaped core 66 is inserted. Thereafter, the rod-shaped core 66 around which the secondary winding n2 is wound is inserted, and the secondary winding n2 and the rod-shaped core 66 are sealed by sealing resin as described with reference to FIGS. This prevents foreign matter and leak discharge.

  In the conventional device, the opening in the storage space for the transformer and drive parts is stored from the side of the transformer, and it is necessary to provide a large space near the transformer for joining the high potential part. There was also a need to have a structure that covers.

  On the other hand, according to the structure of the above embodiment of the present invention, it is possible to connect the secondary winding of the high potential terminal portion and the bus bar by inserting a welding instrument from the hollow portion into which the rod-shaped core is inserted. Therefore, after welding, a rod shape is inserted into the cavity, so there is no wasted space, and the creepage distance is naturally secured to the surroundings, and the case of a complicated structure to ensure the creepage distance, etc. There is an advantage that does not need.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the technical idea.

  For example, in the above embodiment, an example using a rod-shaped core has been described. In the above embodiment, the case where the direction in which the core is inserted into the igniter frame intersects with the direction in which the core is inserted into the socket of the HID valve has been described. However, the present invention is not limited to this, and both directions are the same direction. It may be.

  In short, the present invention does not provide a transformer composed of a primary winding, a secondary winding, and a core separately and installs it in the igniter section. The present invention is also applicable to a lamp-integrated discharge lamp lighting device that does not have.

The figure which shows the circuit structural example of the discharge lamp lighting device by one Embodiment of this invention. The figure for demonstrating the electrical offensive of an igniter in the circuit structure shown in FIG. The perspective view of the discharge lamp lighting device in one embodiment of the present invention. The perspective view of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The side view of the discharge lamp lighting device in one embodiment of the present invention. Sectional drawing which shows the structure of the igniter frame in one Embodiment of this invention. The cross-sectional perspective view which shows the structure of the igniter frame in one Embodiment of this invention. The perspective view of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The perspective view of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The perspective view of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The side view of the discharge lamp lighting device in one embodiment of the present invention. Sectional drawing of the igniter part of the discharge lamp lighting device in one Embodiment of this invention shown in FIG. The cross-sectional perspective view of the igniter part of the discharge lamp lighting device in one Embodiment of this invention shown in FIG. 1 is a cross-sectional view of a discharge lamp lighting device according to an embodiment of the present invention. Sectional drawing of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The cross-sectional perspective view of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The perspective view of the state which covered the cover of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The cross-sectional perspective view of the state which covered the cover of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. Sectional drawing of the state which covered the cover of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. The side view of the state which removed the secondary winding and rod core of the igniter part of the discharge lamp lighting device in one embodiment of the present invention. Sectional drawing of the state which extracted the secondary winding and rod-shaped core of the igniter part of the discharge lamp lighting device in one Embodiment of this invention. Sectional drawing of the state which inserted the secondary winding and rod-shaped core of the igniter part of the discharge lamp lighting device in one Embodiment of this invention.

Explanation of symbols

11 ... DC power supply,
12 ... DC / DC converter,
13 ... DC / AC converter,
14 ... Control circuit,
15: Inverter,
161, 162, 163... Feeder line,
17 ... igniter,
18 ... Socket,
19 ... HID valve,
TR ... Trance,
n1 ... primary winding,
n2 ... secondary winding,
32 ... Input connector,
61 ... igniter frame,
62 ... hollow part,
63 ... partition wall,
64: primary winding groove,
121 ... high-potential terminal,
122 ... low potential terminal part,
123, 151 ... busbar,
171 ... Cover,
172 ... Inlet.

Claims (7)

A discharge lamp device having a socket into which a discharge bulb is inserted, and an igniter section connected to the socket and including a transformer composed of a primary winding, a secondary winding and a core,
The igniter section is
An igniter frame having a bottomed cavity, and a transformer configured by inserting the primary winding on the outer periphery of the igniter frame and the secondary winding including the core on the inner periphery. A discharge lamp lighting device.   2. The discharge lamp lighting device according to claim 1, wherein the transformer is inserted into the cavity portion such that a high potential terminal side of the secondary winding comes to a bottom portion of the cavity portion.   3. The discharge lamp lighting device according to claim 2, wherein the opening of the hollow portion is on the same surface or a surface other than the surface facing the direction in which the discharge bulb is inserted into the socket.   2. The discharge lamp lighting device according to claim 1, wherein the transformer is inserted into the cavity portion such that a low potential terminal side of the secondary winding comes to the opening portion of the cavity portion.   The discharge lamp lighting device according to claim 1, wherein the hollow portion has a cylindrical shape.   One electrode provided on the socket and the high potential terminal side of the secondary winding are connected by a bus bar formed integrally with the igniter frame, and the high potential terminal side of the bus bar and the secondary winding is The discharge lamp lighting device according to any one of claims 1 to 5, wherein the core is connected by welding before the core is inserted at the bottom of the cavity. A discharge lamp device having a socket into which a discharge bulb is inserted, and an igniter section connected to the socket and including a transformer composed of a primary winding, a secondary winding and a core,
The igniter section is
The primary winding is inserted into the outer periphery of an igniter frame having a bottomed cavity, and the secondary winding including the core is inserted into the inner periphery, and at least a position corresponding to the center of the front surface of the core covering the core Consisting of a cover with holes formed in it,
A discharge lamp lighting device, wherein a sealing material is injected from the hole and the hole is sealed.

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