JP2003249384A - Hid lamp lighting transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer having simplified and miniaturized construction by allowing easy winding of a primary coil and a secondary coil on one bobbin without lowering the performance. <P>SOLUTION: The HID lamp lighting circuit allows supply of high voltage to a high voltage input terminal connected to a primary input side of the transformer when lighting a HID lamp for outputting high voltage to the secondary output side of the transformer to start the HID lamp and switches it to the supply of low voltage to a low voltage input terminal connected to the secondary input terminal of the transformer after completing the start to hold the lighting of the HID lamp through a secondary coil of the transformer. The secondary coil is wound on the bobbin with the finishing end of the secondary coil on the high voltage output side as the beginning of the winding and the beginning end of the wound secondary coil is electrically connected to the low voltage input terminal. Then, the primary coil is wound lapping on the upper layer of the secondary coil with the same coil element wire and the finishing end of the wound primary coil is connected to the high voltage input terminal. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an HID (High I
The present invention relates to a transformer for lighting an HID lamp used in a lamp circuit for lighting a HID lamp. 2. Description of the Related Art Recently, an HID lamp lighting device in which a substrate on which an HID lamp lighting circuit is mounted is housed in a case provided with a socket to which the HID lamp can be detachably mounted is provided as a unit. (Japanese Patent Laid-Open No. Hei 11
-87156). As shown in FIG. 6, an HID lamp lighting circuit, as shown in FIG. 6, is connected to a high voltage input terminal H under the control of a lighting control circuit CNT when a lighting switch SW is turned on.
A high voltage of about 000 V is applied to generate a high-voltage pulse on the secondary side of the transformer T '.
The ID lamp LMP is started, and after the start is completed, the supply of the low voltage to the low voltage input terminal L connected to the secondary input terminal of the transformer T 'is switched to the supply of the low voltage to the HID lamp LMP through the secondary coil of the transformer T'. The HID lamp LMP is configured to be adjusted to about 85 V to hold the HID lamp LMP. As the transformer T ', a primary coil and a secondary coil are separately wound around respective bobbins, and then the primary coil bobbin and the secondary coil bobbin are arranged coaxially around a rod-shaped core. It is common to do so. In a conventional HID lamp lighting device, a primary coil and a secondary coil are separately wound around respective dedicated bobbins in order to simplify and downsize the transformer T 'incorporated in the case. Without the coaxial arrangement, as shown in FIG. 7, the core 8 was inserted into the hollow shaft.
A transformer having a structure in which a primary coil 1 and a secondary coil 2 are wound in parallel on the shaft portions of two bobbins 9 is used. [0006] A problem to be solved is a transformer structure in which a primary coil and a secondary coil are wound around a shaft of one bobbin in parallel. Is that the coupling between the primary coil and the secondary coil is poor,
That is, the performance as a transformer is reduced. In a conventional transformer, a primary coil and a secondary coil are wound independently on a bobbin, respectively, and the end of the primary coil and the start of the secondary coil are connected using connection terminals. Is what you need to do. According to the present invention, a high voltage is supplied to a high voltage input terminal connected to a primary input side of a transformer when a HID lamp is turned on, and a high voltage is output to a secondary output side of the transformer. To start the HID lamp, and after the start is completed, switch to the supply of low voltage to the low voltage input terminal connected to the secondary input terminal of the transformer, and switch the HI through the secondary coil of the transformer.
In the HID lamp lighting circuit for lighting and holding the D lamp, even if the primary coil and the secondary coil are wound around one bobbin, the performance does not decrease and the primary coil is terminated. It is not necessary to connect the starting terminal of the secondary coil to the secondary coil by using a connection terminal, so that the structure of the transformer can be simplified and downsized. Specifically, in the HID lamp lighting circuit, the secondary coil is wound around the bobbin starting from the secondary coil end on the high voltage output side, and the starting end of the wound secondary coil is set at the beginning. After being electrically connected to the low-voltage input terminal, the primary coil is wound over the secondary coil with the same coil strand, and the terminal of the wound primary coil is connected to the high-voltage input terminal. The transformer is constituted by the FIG. 1 shows an example of the configuration of an HID lamp lighting circuit according to the present invention. Here, under the control of the lighting control circuit CNT when the lighting switch SW is turned on, for example, a voltage of about +600 V to the input terminal A and a voltage of about -400 V to the input terminal B are applied to the primary side of the transformer T. , A high-voltage pulse is generated at the secondary output terminal C of the transformer T, and the HID lamp LMP connected to the secondary output side is started. And
By switching the supply of the holding voltage to the input terminal B connected to the secondary coil starting end 2S of the transformer T after the start-up is completed, the HID lamp L is passed through the secondary coil 2 of the transformer T.
Adjust so that the voltage applied to MP is about 85V,
The HID lamp LMP is configured to be kept lit. In this HID lamp lighting circuit, particularly in the present invention, the primary coil 1 and the secondary coil 2 of the transformer T are used.
Are configured to be continuously wound around a bobbin using the same coil element wire. More specifically, as shown in FIGS. 2 and 3, the secondary coil 2 is wound around the bobbin 3 starting from the coil terminal on the secondary coil end 2E side, and the wound secondary coil is wound. 2 is connected to the input terminal B on the low voltage side and electrically connected, and then the primary coil 1 is wound on the upper layer of the secondary coil 2 wound by the same coil element wire, The terminal 1E of the wound primary coil 1 is electrically connected to the input terminal A on the high voltage side. At this time, for example, as the secondary coil 2,
Each of the two blocks B1 and B2 in the bobbin 3 has a total number of turns of about 100 to 150 turns and a total number of turns of 200.
It is wound up to about 300 turns. The primary coil 1 is wound on the upper layer of the portion of the secondary coil 2 wound around the block B2 of the bobbin 3 with about 3 to 10 turns. The core T is inserted into the hollow shaft of the bobbin 3 to form the transformer T. According to the winding means of the primary coil 1 and the secondary coil 2 in the transformer T, the secondary coil 2 is wound around the bobbin 3 starting from the coil end 2E on the output side. Therefore, the upper layer portion of the wound secondary coil 2 is on the low voltage side where the voltage is not boosted. Therefore, even if the primary coil 1 is directly wound thereon, the potential difference between the primary coil 1 and the secondary coil 2 is small, and the insulation of the coil wire can sufficiently withstand dielectric breakdown. Thus, according to the present invention, the primary coil 1 and the secondary coil 2 of the transformer T are insulated from each other by using the bobbin 3 having one ordinary shape without using any special bobbin. Can be easily obtained by successively winding the same coil element wire without taking any special measures. FIGS. 4 and 5 show an example of the configuration of an HID lamp lighting device in which the HID lamp lighting circuit according to the present invention is incorporated in a case and unitized. In the case 5 of the HID lamp lighting device, a choke coil L, a bidirectional Zener diode ZD, a resistor R, a capacitor C, and a spark gap SG, which are components of the HID lamp lighting circuit shown in FIG.
And a transformer T. In the figure, reference numeral 51 denotes a transformer T in case 5;
The transformer T is press-fitted from an opening on the back side of the case 5. Reference numeral 52 denotes a connector from which the input terminal A on the high voltage side, the input terminal B on the low voltage side, and the GND terminal of the HID lamp lighting circuit incorporated in the case 5 are drawn out. Each of the constituent elements L and Z incorporated in the case 5
D, R, C, and SG are wired by the bus bar 6 so as to be three-dimensionally arranged in a hierarchy. At this time, in particular, in the case of the Zener diode ZD, the Zener diode ZD is inserted into the housing 7 provided integrally with the housing of the capacitor C.
To be assembled three-dimensionally. According to such a configuration, the components L, ZD, R, C, and SG of the HID lamp starting circuit are three-dimensionally arranged in the case 5 by using only the wiring by the bus bar 6 without using any circuit board. The HID incorporated in the case 5 can be easily and freely arranged in the three-dimensional space.
The space factor of the lamp lighting circuit is improved. As described above, the HID lamp lighting transformer according to the present invention supplies a high voltage to the high voltage input terminal connected to the primary input side of the HID lamp when the HID lamp is turned on.
A high voltage is output to the next output side to start the HID lamp, and after the start is completed, switching to supply of low voltage to a low voltage input terminal connected to a secondary input terminal of the transformer is performed, and the HID lamp is switched through a secondary coil of the transformer. HI to hold lighting
In the D lamp lighting circuit, the secondary coil was wound around the bobbin starting from the secondary coil end on the high voltage output side, and the beginning of the wound secondary coil was electrically connected to the low voltage input terminal. In addition, the primary coil is wound on the upper layer of the secondary coil with the same coil element wire, and the terminal of the wound primary coil is connected to the high voltage input terminal. It has the advantage that the primary coil and the secondary coil can be easily wound without any performance deterioration, and the transformer structure can be simplified and downsized effectively. I have.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram showing one configuration example of an HID lamp lighting circuit according to the present invention. FIG. 2 is a front view showing a transformer for lighting an HID lamp according to one embodiment of the present invention. FIG. 3 is a side view of the HID lamp lighting transformer. FIG. 4 is a plan view showing an example of a unit in which the lamp lighting circuit shown in FIG. 1 is incorporated in a case. FIG. 5 is a front sectional view of the unit. FIG. 6 is an electric circuit diagram showing a conventional HID lamp lighting circuit. FIG. 7 is a front sectional view showing a configuration example of a conventional transformer. [Description of Signs] 1 Primary coil 2 Secondary coil 3 Bobbin 4 Core 5 Case

Claims (1)

Claims: 1. When a HID lamp is turned on, a high voltage is supplied to a high voltage input terminal connected to a primary input side of a transformer, and a high voltage is output to a secondary output side of the transformer. An HID lamp lighting circuit for starting the vehicle, switching to supplying a low voltage to a low-voltage input terminal connected to a secondary input terminal of the transformer after the start is completed, and performing lighting and holding of the HID lamp through a secondary coil of the transformer. High voltage output side 2
The secondary coil is wound around the bobbin starting from the end of the secondary coil, the starting end of the wound secondary coil is electrically connected to the low-voltage input terminal, and then the upper layer of the secondary coil is formed by the same coil wire. A transformer for lighting an HID lamp in which a primary coil is wound in an overlapped manner, and an end of the wound primary coil is connected to a high voltage input terminal.