JP2585000Y2 - Coil bobbin device for high-voltage pulse transformer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil bobbin device of a high-voltage pulse transformer used for a starting device for starting and restarting a high-pressure discharge lamp such as a mercury lamp and a metal halide lamp.

[0002]

2. Description of the Related Art Generally, a high-pressure discharge lamp such as a mercury lamp or a metal halide lamp requires a high starting voltage, and a high-voltage pulse generated by a starting device (referred to as an igniter) is applied to both ends of the lamp. It starts with. Although it depends on the type of lamp, a very high voltage of about several tens of kv is generally required to instantaneously restart the high-pressure discharge lamp, and a circuit as shown in FIG. 7 is used. FIG. 8 shows an igniter circuit in the circuit of FIG.

The operation state will be described with reference to the circuit diagrams of FIGS. A no-load secondary voltage of the ballast X is generated between the secondary terminals x and y of the ballast X. This voltage is boosted by the boosting transformer Trf in the circuit of the igniter Ig. On the secondary side of the ballast X, a high voltage as shown by the broken line in FIG. The secondary side of the ballast X, capacitor C _2, is connected to the primary winding n ₁ and the discharge gap Gap of the high-voltage pulse transformer PT, across the capacitor C ₂ as shown in FIG. 9 (A) The voltage rises gradually. This voltage is applied to the discharge gap Ga.
p of the discharge start voltage Vgap (e.g., about several kv) reaches the charge stored in the capacitor C ₂ is abruptly discharged through the primary winding n ₁ and the discharge gap Gap of the high-voltage pulse transformer PT.

At that time, a high-voltage pulse voltage (for example, about several tens of kv) is generated in the secondary winding n ₂ of the high-voltage pulse transformer PT in accordance with the turn ratio. Then, the high-voltage pulse voltage is applied across the lamp L via the capacitor C ₁ and to start the lamp L. The same applies to the operation at the time of restart, and although a high-voltage pulse of about several tens of kv is generated, it is possible to restart immediately even immediately after the light is turned off. When the lamp L is started and lit, the secondary terminal voltage of the ballast X becomes substantially equal to the lamp voltage, and is reduced to about 1/2 or less with no load, so that the secondary side of the step-up transformer Trf of the igniter Ig is used. The voltage is the discharge starting voltage Vga of the discharge gap Gap.
Therefore, the generation of the high-voltage pulse stops in the discharge gap Gap.

FIG. 3 shows an example of the structure of a conventional high-voltage pulse transformer. A primary a for similarly winding a columnar primary winding b around a core a made of a material such as a columnar ferrite is shown. A secondary bobbin e for winding a bobbin c and a secondary winding d is externally provided. In such a high-voltage pulse transformer, a high-voltage pulse of about several tens of kilovolts is generated in the secondary winding d, so that the withstand voltage between the primary winding b and the secondary winding d or the creeping withstand voltage between the secondary winding d. To ensure the function, house the high-voltage pulse transformer in case f
It is configured by filling with epoxy resin g. As shown in FIGS. 4A and 4B, a groove h for winding a coil is formed in the primary bobbin c or the secondary bobbin e. This can be performed simply and the distance between the windings is made constant.

[0006]

As described above, in the conventional high-voltage pulse transformer, the epoxy resin is filled in order to secure the withstand voltage. However, the filling is incomplete, and the resin is filled with the primary bobbin c and the secondary bobbin. If a space is formed between the bobbins e without sufficiently flowing between them, when a high-voltage pulse voltage is generated, the electric field concentrates in that space, causing electrical breakdown, and as a result, There is a risk that a predetermined pulse voltage is not generated, or in the worst case, the high-voltage pulse transformer is broken or burnt.

Further, in order to reduce the size of the high-voltage pulse transformer, the gap between the primary bobbin c and the secondary bobbin e is made as small as possible. When the resin is to be filled, there is a disadvantage that the workability of the filling is deteriorated because the filling time is longer and the filling temperature needs to be increased. In order to facilitate the filling operation, there is a method of providing a projection i inside the secondary bobbin e to increase the gap between the primary bobbin c and the secondary bobbin e as shown in FIG. Since the shape becomes larger only at the portion i, or the relative distance between the primary winding b and the secondary winding d increases, magnetic coupling deteriorates, and the value of the pulse voltage generated in the secondary winding d Is reduced. Further, since the primary bobbin c and the secondary bobbin e are provided, the structure of the entire high-voltage pulse transformer becomes large. After the primary winding b is wound around the primary bobbin c, the primary bobbin c is removed from the secondary winding. It must be inserted into the secondary bobbin e having the secondary winding d, and it is difficult to wire the primary winding b at the beginning and end of winding.

Further, as shown in FIG. 6, there is a structure in which a primary winding b and a secondary winding d are wound on one bobbin j so as to be shared. There is also a problem that the magnetic coupling between the lines d deteriorates and the peak value of the pulse voltage generated in the secondary winding d decreases. In view of the above conventional problems, the present invention provides a high-voltage pulse transformer having excellent magnetic coupling and good insulation performance by sharing the bobbin of the primary winding and the secondary winding. The purpose of the present invention is to provide a coil bobbin.

[0009]

To achieve the above object, according to the Invention The, this invention is one outside circumference of the bobbin which is formed in a cylindrical shape
The groove in which the next winding is wound one by one in the longitudinal direction of the bobbin
And the groove and depth are different,
And continuous in the longitudinal direction of the bobbin adjacent to the groove.
The secondary winding is wound one by one in the groove formed .

[0010]

The operation of the present invention will be described. Formed into a tubular shape
The primary winding and the secondary winding are respectively installed in two grooves of different depths provided on the outer circumference of the bobbin.
By winding one turn at a time , the magnetic coupling and insulation performance of the two are maintained in a good state.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which a primary winding 4 is wound one by one in a groove 2 formed in the vicinity of an intermediate portion on the outer periphery of a bobbin 1 formed in a cylindrical shape . adjacent to the groove 2 in the groove 3 which is slightly shallower, the set to be substantially equal to the winding pitch of the primary winding 4, a secondary winding 5 over substantially the entire region in the longitudinal direction of the bobbin 1 one They are wound one by one . With this configuration,
It is possible to wind the primary winding 4 and the secondary winding 5 by sharing one bobbin 1, thereby improving magnetic coupling and sufficiently securing insulation between the two. .

FIG. 2 shows a second embodiment of the present invention.
The difference from the embodiment is that both the primary winding 4 and the secondary winding 5 are wound over substantially the entire area of the bobbin 1 in the longitudinal direction. In such a configuration, if the number of turns of the primary winding 4 and the secondary winding 5 is, for example, the same as that of the first embodiment, there is an advantage that the length of the bobbin 1 in the longitudinal direction can be significantly reduced. Also, since the primary winding 4 can be wound substantially all over the secondary winding 5, the magnetic coupling is further improved as compared with the case of the first embodiment, and a higher high-voltage pulse can be generated. The starting performance of the lamp can be improved.

The grooves 2 are used in both the first and second embodiments.
Although the groove 3 is formed to be slightly shallower than the groove 3, the groove 2 may be formed to be slightly shallower than the groove 3. In addition, a high-voltage pulse transformer is housed in a case,
If the structure is filled with an epoxy resin, it goes without saying that the insulation performance is improved and the size can be significantly reduced.

[0014]

The present invention is constructed as described above, and uses the bobbin of the primary winding and the secondary winding in common to provide excellent magnetic coupling and good insulation performance. There is.

[Brief description of the drawings]

FIG. 1 is a front view of a bobbin showing a first embodiment of the present invention.

FIG. 2 is a front view of a bobbin showing a second embodiment of the present invention.

FIG. 3 is a cross-sectional front view of a conventional high-voltage pulse transformer.

FIG. 4A is a front view of a bobbin used in a conventional high-voltage pulse transformer, and FIG. 4B is a side view of the same.

FIG. 5 is a side view showing another example of a bobbin used in a conventional high-voltage pulse transformer.

FIG. 6 is a front view showing another example of a conventional high-voltage pulse transformer.

FIG. 7 is a high-pressure discharge lamp lighting circuit diagram.

FIG. 8 is an igniter circuit diagram inside a high pressure discharge lamp lighting circuit.

FIG. 9 is a voltage waveform diagram of a high pressure discharge lamp lighting circuit.

[Explanation of symbols]

 1 bobbin 2, 3 groove 4 primary winding 5 secondary winding

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01F 27/32 H01F 19/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A outer peripheral primary winding bobbin formed in a cylindrical shape
A groove in which the wire is wound one by one is connected in the longitudinal direction of the bobbin.
While forming continuously , the groove and the depth are different, and continuously in the longitudinal direction of the bobbin adjacent to the groove.
A coil bobbin device for a high-voltage pulse transformer in which a secondary winding is wound one by one in a formed groove .