WO2000018195A1

WO2000018195A1 - Discharge lamp lighting device

Info

Publication number: WO2000018195A1
Application number: PCT/JP1998/004272
Authority: WO
Inventors: Fumihiro Minami
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1998-09-22
Filing date: 1998-09-22
Publication date: 2000-03-30
Also published as: JP4230112B2

Abstract

A discharge lamp lighting device in which a socket section for mounting a discharge lamp is constituted in a small size and a thin thickness by providing a circular arcuate transformer for generating high voltage on the outer periphery of the socket section and circular arcuate circuit constituting parts for generating high voltage on the outer periphery of the socket section concentrically with the transformer and surrounding the socket section, and securing safety against high voltages.

Description

Description Discharge lamp lighting device Technical field

The present invention relates to a discharge lamp lighting device applied to a vehicle headlight device and the like. Background art

As shown in Fig. 1, the circuit configuration of a discharge lamp lighting device applied to a vehicle headlight device or the like that uses a discharge lamp such as a metal eight-light lamp as a light source is as follows: Converts the DC output to AC and generates an inverter circuit 3 that controls and stabilizes the voltage and power required by the discharge lamp 2, and generates a high voltage, for example, 20 KV, required to start the discharge lamp 2. An igniter circuit 4 and a starting device 6 having a transformer 5 for generating high voltage are provided.

Next, the operation will be described.

When turning on the discharge lamp 2, the power switch (not shown) is closed and the DC output of the power supply 1 is supplied to the inverter circuit 3. The inverter circuit 3 converts the direct current to AC and supplies it to the starting device 6. The starting device 6 generates a high voltage, for example, 20 KV, by the inverter circuit 4 and the high-voltage generating transformer 5 based on the input alternating current, and applies the high voltage to the discharge lamp 2 to start it. Is to control the inverter circuit 3 so as to supply the specified power, for example, 30 W, to the discharge lamp 2 to maintain the discharge. In order to start the discharge lamp 2 as described above, it is necessary to apply a high voltage of 20 KV. Therefore, the starting device 6 that generates a high voltage, that is, It is necessary to keep the user from touching the evening circuit 4 and the high-voltage generating transformer 5 directly. Therefore, the starting device 6 is integrally assembled to a socket portion on which the discharge lamp 2 is mounted.

In this case, if the starting device 6 is integrally assembled on the axis of the socket portion, a large bulge will occur behind the socket portion, and the discharge lamp 2 that is detached and attached to the socket portion to which the starting device 6 is integrated. Was difficult to work due to the narrow space between the car and the body.

Therefore, as shown in FIG. 2, a high-voltage generating transformer 5 having a large-sized closed magnetic circuit core is provided on the outer periphery of the socket 7a in the socket 7, and the components of the inverter circuit 4 are connected to the socket. The high voltage generating transformer 5 having a closed magnetic circuit core is provided on the outer periphery of the socket 7a in the socket 7 as shown in FIG. For example, Japanese Patent Application Laid-Open No. 8-315630 discloses a transformer provided with components of an ignition circuit 4 on the outer periphery of a transformer.

Since the conventional discharge lamp lighting device is configured as described above, safety against high voltage when attaching and detaching the socket is ensured.However, in the configuration shown in FIG. 2, the igniter circuit 4 is still not used. The rear part of the socket 7 protrudes only at the part where the components are assembled, and the configuration shown in FIG. 3 is thin, but the socket 7 has a large diameter, so that the socket cannot be made smaller and thinner. . Moreover, the conventional high-voltage generating transformer 5 because you are using a closed magnetic path core, the magnetic flux easy although inductance flow is high, the supply to the discharge lamp 2, for example 4 0 0 H _Z square wave switching point I As shown in Fig. 4 (a), a period during which no current flows occurs, and the discharge lamp turns off momentarily. Then, when the voltage rises, a current flows again, and at this time, a large ripple current flows, and there is a problem that an electromagnetic wave (radio noise) is easily generated at the edge. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has an object to provide a discharge lamp lighting device capable of providing a socket with a small and thin configuration and supplying sufficient power to a discharge lamp as a load. The purpose is to gain.

Another object is to reduce eddy currents generated in the core of the high-voltage generating transformer, improve high-frequency characteristics, and improve efficiency.

It also aims to facilitate the removal of the mold during pobin molding.Also, it is possible to ensure the withstand voltage between the coils and to improve the workability of winding the primary coil and secondary coil around the bobbin. The purpose is to achieve.

In addition, the primary coil and the secondary coil are continuously wound with the same wire, thereby simplifying the winding process and facilitating the acquisition and handling of the wire. Disclosure of the invention

The present invention provides a socket for mounting a discharge lamp, a high-voltage generating transformer having an arcuate core disposed on the outer periphery of the socket, and a high-voltage generating transformer on the outer periphery of the socket. A high-voltage generating circuit means which is concentrically arranged so as to surround the socket together with the transformer is provided, so that the socket can be made small and thin. Furthermore, the transformer for generating high voltage having an arc-shaped core has a smaller inductance component than when a closed magnetic circuit core is used, and can improve the efficiency, thus providing sufficient power for the discharge lamp as a load. Can be supplied.

Also, the present invention provides a basic structure of a transformer for generating a high voltage, comprising: a laminated core bent in an arc shape; a pobin provided on an outer surface of the laminated core; and a primary and a secondary coil wound on the pobin. It depends on the laminated core As a result, the eddy current generated in the laminated core is reduced, the high-frequency characteristics are improved, the efficiency is improved, and the withstand voltage between the core and the coil can be reliably ensured by the pobin.

Further, according to the present invention, since a plurality of coil winding grooves are formed on the outer circumferential surface of the arc-shaped laminated core on the outer peripheral surface of the pobin at substantially constant intervals, the die can be easily removed at the time of forming the pobin.

In addition, the present invention provides a coil winding groove formed on a pobin, in which a primary coil is partially wound and a secondary coil is wound in a single layer in parallel with the remaining coil winding groove, so that the resistance between the coils is improved. The voltage can be ensured, and the winding process is simplified.

Also, the present invention provides a primary coil in which a plurality of wires are bundled, and one of the wires is used as a secondary coil. The next coil can be continuously wound with the same wire, and the coil winding process can be simplified. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a power supply circuit diagram for a discharge lamp. Fig. 2 is a longitudinal sectional view of a conventional socket incorporating a high-voltage generating transformer and an inductive circuit component. Fig. 3 is a high-voltage generating transformer and an inductor. Fig. 4 is a longitudinal sectional view of another conventional socket incorporating circuit components, Fig. 4 is a waveform diagram of the discharge lamp voltage and current depending on the magnitude of the inductance of the high-voltage generating transformer, and Fig. 5 is FIG. 6 is an exploded perspective view showing the discharge lamp lighting device of the invention, FIG. 6 is a longitudinal sectional view of a socket part in which a discharge lamp is mounted, and a high-voltage generating transformer and a circuit component of the inverter circuit are incorporated. FIG. 8 is an explanatory view of a transformer for generating high voltage, (a) is a perspective view of a laminated core, (b) is a perspective view of a bobbin molded on an outer surface of the laminated core, and (c) is a perspective view. Primary coil on pobin, 2 FIG. 9 is a perspective view of a high-voltage generating transformer provided with a secondary coil, and FIG. 9 is an explanatory diagram showing a winding state of a primary coil and a secondary coil. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, in order to explain this invention in greater detail, the preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiment 1

FIG. 5 is an exploded perspective view showing the discharge lamp lighting device of the present invention, wherein 11 is a discharge lamp, 12 is a socket for mounting the base 11a of the discharge lamp 11, and a socket to be described later. It incorporates a high-voltage generation transformer and igniter circuit components as high-voltage generation circuit means.

13 is a power supply circuit including an inverter circuit for converting DC to AC, 14 is a plug inserted into the mounting port 13 a of the power supply circuit 13, 15 is a plug 14 attached to one end and 14 attached to the other end Is a lead wire connected to a circuit terminal in the socket 12, and 16 is a lead wire having one end connected to the power supply circuit section 13 and the other end having a plug 17 for power supply connection.

Fig. 6 is a vertical sectional view of a socket 12 with a discharge lamp 11 attached and a transformer 18 for high-voltage generation and a igniter circuit component 19, and Fig. 7 shows a socket 12 with a lid 1 It is the side view which removed 2b. The socket 12 basically has a socket portion 12a and a lid 12b, and an electrode mounting portion 12a for mounting a socket electrode (not shown) is provided in the center of the socket portion 12a. 1, and a mounting port 12a-2 for mounting the base 11a of the discharge lamp 11 is formed facing the electrode mounting section 12a-1. Further, the outer peripheral portion of the electrode mounting portion 12a-1 has a storage space 20 for a high-voltage generating transformer 18 having an arc-shaped laminated core in a range of approximately 120 °. The installation space 21 of the igniter circuit component 19 is formed concentrically with the storage space 20. After the high voltage generating transformer 18 and the igniter circuit component 19 are assembled, the socket section is formed. Since the lid 12 b is attached to 12 a, the circuit element 19 is pressed and held by the mounting board 22.

FIG. 8 is an explanatory view of a transformer for generating a high voltage. As shown in FIG. 8 (a), for example, a plurality of 0.1 mm silicon steel sheets are laminated and bent in an arc, or a plurality of arcs are formed. Laminated silicon steel sheets are laminated to form a laminated core 23.

Next, as shown in (b), the bobbin 24 is molded outside the laminated core 23 by insert molding. At the time of this molding, a plurality of coil winding grooves 24a are formed on the three sides except for the arc-shaped inner surface of the pobin 24, that is, on both side surfaces and the outer surface at substantially constant intervals so as to extend outward.

Then, as shown in (c), the primary coil 25 is partially connected to the coil winding groove 24a of the pobin 24, and the secondary coil 26 is parallelly mounted to the remaining coil winding groove 24a. Single wrap. The wound coil is reliably prevented from moving to the left and right by the groove wall. In this case, as shown in Fig. 9, the coil to be wound is such that a plurality of wires 27 are bundled and wound for the primary coil 25, and the wire 27 is wound as it is for the secondary coil 26. As a result, the primary coil 25 and the secondary coil 26 can be continuously wound by the same wire 27.

Next, the operation will be described.

When the discharge lamp 11 is turned on, a power switch (not shown) is closed, and a DC output is supplied from a power source (not shown) to the inverter circuit of the power supply circuit section 13.This inverter circuit converts DC to AC. To the circuit components 19. Idanai circuit components 19 A high voltage, for example, 20 KV, is generated in the secondary coil 26 by flowing through the primary coil 25 of the pressure generating transformer 18, and this high voltage is applied to the discharge lamp 2 through the socket electrode. The discharge lamp is started, and after the start, the power supply circuit section 13 operates so as to supply the specified power, for example, 30 W, to the discharge lamp 2 to maintain the discharge.

In this case, since the transformer 18 for generating high voltage uses an arc-shaped open magnetic circuit core, the magnetic flux is difficult to pass through and the inductance is small, so that the discharge lamp 2 is used as shown in Fig. 4 (b). For example, a 400 _Hz rectangular wave current flowing through the device flows without interruption, and therefore, the generation of electromagnetic waves based on the current ripple is small.

As described above, according to the first embodiment, the high voltage generating transformer 18 is provided on the outer periphery of the socket portion 12 a in the socket 12, and the high voltage generating transformer 18 is connected to the high voltage generating transformer 18. Since the circuit elements 19 are arranged in a concentric arc, no protruding portion is formed at the rear of the socket 12 and the diameter of the socket is not increased. 8 and the igniter circuit component 19 can be assembled together to ensure safety against high voltage, and the socket 12 can be made small and thin.

Also, since the transformer 18 for high voltage generation incorporated in the socket 12 uses an arcuate core forming an open magnetic circuit, the inductance component is smaller than when a normal closed magnetic circuit core is used. It is possible to reduce the generation of electromagnetic waves and to easily supply sufficient electric power to the discharge tube as a load. In addition, since a laminated silicon core is used, eddy current flowing through the core can be reduced, and high-frequency characteristics can be improved.

In addition, a plurality of coil winding grooves are formed on both sides and the outer surface of at least the pobin 24 except for the inner surface of the circular arc, so that the mold after molding is formed. Easy removal.

In addition, the primary coil 25 was partially wound around a part of the coil winding groove 24a of the pobin 24, and the secondary coil 26 was wound around the remaining coil winding groove 24a in a single layer. In addition, the insulation between the eyebrows of the second order is not required, and the winding process can be simplified as compared with the case where the first and second orders are repeatedly wound.

Also, since a plurality of wires are bundled to form a primary coil, and the wire itself is a secondary coil, a large current can easily flow through the primary coil, and the primary coil and the secondary coil are made of the same wire. Thus, the coil can be wound continuously, and the coil winding process can be simplified. Since the same wire is used for the primary coil and the secondary coil, it is easy to obtain and handle the wire. Industrial applicability

As described above, in the discharge lamp lighting device according to the present invention, the high-voltage generating transformer and the high-voltage generating circuit component mounted on the board are concentrically arranged on the outer periphery of the socket so as to surround the socket. The sockets are arranged in a shape, ensuring safety against high voltages and enabling the socket to be made small and thin.

Claims

Range of request

1. A socket for mounting a discharge lamp, a high-voltage generating transformer having an arcuate core disposed on the outer periphery of the socket, and the high-voltage generating transformer on the outer periphery of the socket. And a high-voltage generating circuit component concentrically disposed so as to surround the socket portion.

2. The high-voltage generation transformer has a basic structure consisting of a laminated core bent in an arc shape, a pobin provided on the outer surface of the laminated core, and a primary coil and a secondary coil wound on the pobin. The discharge lamp lighting device according to claim 1.

3. The discharge lamp lighting device according to claim 1, wherein a plurality of coil winding grooves are formed at substantially constant intervals on the outer peripheral surface of the pobin provided on the arc-shaped laminated core.

4. The discharge lamp lighting device according to claim 1, wherein a primary coil is wound around a part of the bobbin's coil winding groove, and a secondary coil is wound around the remaining coil winding groove in a single layer.

5. The discharge lamp lighting device according to claim 1, wherein a plurality of wires are bundled to form a primary coil, and one of the wires is used as a secondary coil to wind a high voltage generating transformer.