JPH11297549A - High-voltage generating coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-voltage generating coil, which being small and low cost, provides a secondary voltage with high peak value. SOLUTION: In a high-voltage generating coil in which a primary coil and a secondary coil are wound around a bobbin, a bobbin 33b is molded of synthetic resin, a plurality of split flanges 33ba are so provided on outer periphery, that secondary coil grooves 33d are positioned at both ends, while a primary coil groove 33c and a secondary coil groove 33d are positioned alternately, and a plurality of primary coil grooves 33c are wound with a primary coil 33e and a plurality of secondary coil grooves 33d are wound with a secondary coil 33f. The number of turns of the secondary coil 33f wound around the secondary coil grooves 33d on both ends is one half that of the secondary coil 33f wound around the other secondary coil groove 33d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage generating coil such as a capacitor discharge type high voltage generating coil used for starting an HID lamp (high intensity discharge lamp) or igniting a gas combustor.

[0002]

2. Description of the Related Art FIG. 4 is a circuit diagram of a typical capacitor discharge type high voltage generator for starting a HID lamp. In FIG. 4, 1 is a battery, 2 is a DC-DC converter (DC-DC converter), 3 is a high voltage generating coil, 4 is a capacitor, and 5 is a thyristor. The high-voltage generating coil 3 includes an iron core 3a, a primary coil 3e wound around the outer periphery of the iron core 3a, and a secondary coil 3f wound around the outer periphery of the iron core 3a.

[0003] The capacitor discharge high voltage generator shown in FIG. 4, charged to the charging voltage V _c of about 300 V (volts) capacitor 4 with a DC-DC converter 2, to turn on the thyristor 5 at an appropriate time by rapidly applying a charge voltage V _c to the primary coil 3e Te, the secondary coil 3
It is intended to generate a secondary voltage V ₂ of about 20kV to f.

FIG. 5 is an explanatory view showing the structure of an example of a conventional high voltage generating coil. In FIG. 5, reference numeral 31 denotes a high-voltage generating coil, and a primary coil winding groove 31c and a secondary coil winding 31 are formed by an iron core 31a and a plurality of divided winding flanges 31ba formed of a synthetic resin and provided on the outer periphery. Wire groove 3
1d is formed, and bobbin 31b into which iron core 31a is inserted
A primary coil 31e wound around a primary coil winding groove 31c, a secondary coil 31f wound around a secondary coil winding groove 31d, a primary coil 31e and a secondary coil 3e.
Bobbin 31b in which 1f is wound and iron core 31a is inserted
Case 31g for accommodating the
The core 31a and the bobbin 31b housed therein are fixed, and the thermosetting resin 31h performs high-voltage insulation between them.

FIG. 6 shows a waveform of a secondary voltage of the high voltage generating coil shown in FIG. The primary coil 31e
Has an outer diameter of a 0.5mm approximately enameled wire, it is wound around the winding number N ₁ as 3. The secondary coil 31f is formed by enameling an outer diameter of about 0.3 mm and winding the number of turns N ₂ to 200.
It is wound as. Then, in FIG. 4, as well as to 1μF the capacitance of the capacitor 4, a charge voltage V _c 3
00V.

The high voltage generating coil 31 shown in FIG.
By winding the primary coil 31e and the secondary coil 31f around the outer periphery of the two bobbins 31b, miniaturization and cost reduction are achieved. However, since the primary coil 31e is wound around the primary coil winding groove 31c formed at one end of the bobbin 31b, that is, since the primary coil 31e and the secondary coil 31f are separated from each other, both coils 31
e, 31f have poor magnetic coupling, specifically the coupling coefficient K
As shown in FIG. 6, only a secondary voltage V ₂ having a peak value of about 17.5 kV can be obtained.

FIG. 7 shows another example of a conventional high voltage generating coil.
FIG. 3 is an explanatory diagram showing a configuration. The high-voltage generator shown in FIG.
The raw coil has the problem of the high voltage generating coil 31 shown in FIG.
It has been proposed to solve the point. In FIG.
Reference numeral 32 denotes a high-voltage generating coil, which includes an iron core 32a and a synthetic tree.
Molded with grease and has a winding groove 32c for the primary coil on the outer circumference
Primary coil bobbin 32b₁And molded with synthetic resin
And a secondary coil 32ba provided on the outer periphery.
Winding groove 32d is formed, and the primary coil bobbin 32b is formed.
₁And the iron core 32a is inserted
Bobbin 32b for coil_TwoAnd the winding groove 32c for the primary coil
And a winding groove for a secondary coil
A secondary coil 32f wound around 32d and a primary coil 3
2e wound primary coil bobbin 32b ₁, Secondary
And the core 32a is inserted.
And the primary coil bobbin 32b₁Secondary coil inserted through
Bobbin 32b_TwoAnd an insulating case 32g for accommodating the
Iron core 32a housed in insulating case 32g, each bobbin 3
2b₁, 32b_TwoAnd the mutual high voltage
It is composed of a thermosetting resin 32h as an insulating material for forming an edge.
Have been. The bobbin 32b is a concentric cylindrical primary
Bobbin 32b for coil₁And the secondary coil bobbin 32b
_TwoIt is composed of

FIG. 8 is a diagram showing a waveform of a secondary voltage of the high voltage generating coil shown in FIG. The primary coil 32e
Has an outer diameter of a 0.5mm approximately enameled wire, it is wound around the winding number N ₁ as 3. In addition, the secondary coil 32f is formed by enameling an outer diameter of about 0.3 mm, and setting the number of turns N ₂ to 200.
It is wound as. Then, in FIG. 4, as well as to 1μF the capacitance of the capacitor 4, a charge voltage V _c 3
00V.

In the high-voltage generating coil 32 shown in FIG. 7, the primary coil 32e and the secondary coil 32f are arranged near the axial center of the iron core 32a in the axial direction of the iron core 32a. , 32f, and the coupling coefficient K is preferably about 0.85.
As can be seen from FIG. 7, a secondary voltage V ₂ having a peak value of about 22 kV, which is close to an ideal value, can be obtained. However, the bobbin 32b, which is configured in bobbin 32b ₁ for concentric cylindrical primary coil and the secondary coil bobbin 32b _2, as well as large, expensive.

[0010]

As described above, FIG.
Although the conventional high-voltage generating coil 31 shown in FIG. 1 can be reduced in size and cost, it has a poor coupling coefficient K of about 0.7 and obtains only a secondary voltage V ₂ having a peak value of about 17.5 kV. There is a disadvantage that it cannot be done. The conventional high-voltage generating coil 32 shown in FIG. 7 has a coupling coefficient K of about 0.85 and can obtain a secondary voltage V ₂ having a peak value of about 22 kV. There is a disadvantage of being expensive.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned disadvantages. A high-voltage generating coil capable of reducing the size and cost and obtaining a secondary voltage having a high peak value. Is provided.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a high voltage generating coil in which a primary coil and a secondary coil are wound around the outer periphery of a bobbin. A plurality of divided winding flanges each partitioning a plurality of coil winding grooves are provided on the outer periphery, a secondary coil is wound around a plurality of secondary coil winding grooves, and a primary coil is wound on a plurality of primary coil winding grooves. Or forming a bobbin with a synthetic resin, providing a plurality of divided winding flanges on the outer periphery for forming a plurality of secondary coil winding grooves, and forming a primary coil winding groove on the outer periphery of the divided winding flange. The secondary coil is wound around a plurality of secondary coil winding grooves, and the primary coil is wound around a plurality of primary coil winding grooves. Then, the winding groove for the secondary coil is positioned at both ends, and the winding groove for the primary coil and the winding groove for the secondary coil are alternately arranged. It is preferable that the number of turns of the secondary coil wound around the secondary coil be half of the number of turns of the secondary coil wound around the other secondary coil winding groove.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration of a high-voltage generating coil according to a first embodiment of the present invention. In FIG. 1, reference numeral 33 denotes a high voltage generating coil,
And a plurality of primary coil winding grooves 3 formed by a plurality of divided winding flanges 33ba formed in a cylindrical shape with a synthetic resin and provided on the outer periphery.
3c and a plurality of secondary coil winding grooves 33d are formed alternately, a bobbin 33b into which an iron core 33a is inserted, and a primary coil 33e wound around the primary coil winding groove 33c.
A secondary coil 33f wound around the secondary coil winding groove 33d, an insulating case 33g that houses the primary coil 33e and the secondary coil 33f, and accommodates the bobbin 33b into which the iron core 33a is inserted, While fixing the iron core 33a and the bobbin 33b housed in the insulating case 33g,
It is composed of a thermosetting resin 33h that performs mutual high-voltage insulation.

The width of the primary coil winding groove 33c is
The width is set to such an extent that the wire diameter of the winding has some allowance. Further, the width of the secondary coil winding groove 33d at both ends is half the width of the other secondary coil winding groove 33d, and the number of windings is the number of windings of the other secondary coil winding groove 33d. It is half the number of turns of the wire.

FIG. 2 is a diagram showing a waveform of a secondary voltage of the high voltage generating coil shown in FIG. The primary coil 33e
It is the enameled wire of about the outer diameter of 0.5 mm, are wound once for each primary coil winding grooves 33c turns N ₁ as 3. The secondary coil 32f has an outer diameter of 0.3 mm.
The extent of the enameled wire, are wound by distributing to each secondary coil winding grooves 33d turns N ₂ as 200. Then, in FIG. 4, as well as to 1μF capacitance of the capacitor 4, and the charging voltage V _c to 300 V.

The high voltage generating coil 33 shown in FIG.
Since the primary coil 33e and the secondary coil 33f are wound around the outer periphery of the three bobbins 33b, the size can be reduced and the cost can be reduced. Then, the primary coil 33e and the secondary coil 33f are arranged near the axial center of the iron core 33a in the axial direction of the iron core 33a, and are disposed.
Since the primary coil 33e is provided so as to cover the winding width (the number of turns) of the secondary coil 33f evenly and closely,
The magnetic coupling between the two coils 33e and 33f is good, specifically, the coupling coefficient K is good at about 0.9. As can be seen from FIG. 2, the secondary voltage having a peak value of about 23 kV, which is close to an ideal value. V ₂ can be obtained.

FIG. 3 is an explanatory diagram showing a configuration of a high voltage generating coil according to a second embodiment of the present invention. In FIG. 3, reference numeral 34 denotes a high-voltage generating coil, and a plurality of secondary coil winding grooves 34d are formed by an iron core 34a, a cylindrical shape formed of synthetic resin, and a plurality of divided winding flanges 34ba provided on the outer periphery. , A primary coil 34 wound around a bobbin 34b into which an iron core 34a is inserted, and a primary coil winding groove 34c formed on the outer periphery of a plurality of divided winding flanges 34ba excluding both ends.
e, a secondary coil 34f wound around the secondary coil winding groove 34d, a primary coil 34e and a secondary coil 34f.
Is wound, and an insulating case 34h for accommodating the bobbin 34b into which the iron core 34a is inserted, and a thermosetting resin for fixing the iron core 34a and the bobbin 34b accommodated in the insulating case 34h and performing high-voltage insulation between them. 34 g.

The width of the primary coil winding groove 34c is
The width is set to such an extent that the wire diameter of the winding has some allowance. The secondary coil winding groove 34d at both ends has a width that is half the width of the other secondary coil winding groove 34d, and the number of turns of the secondary coil winding groove 34d is equal to that of the other secondary coil winding groove 34d. It is half the number of turns of the wire.

The same effect as the high voltage generating coil 33 shown in FIG. 1 can be obtained in the high voltage generating coil 34 shown in FIG.

In the above-described embodiment, three primary coil winding grooves 33c and 34c, and secondary coil winding grooves 33d and 33d are used.
34d and four secondary coil winding grooves 33d, 34d
Are positioned at both ends, and the winding grooves for primary coil 33c, 34c
And the secondary coil winding grooves 33d and 34d are alternately arranged, and the number of turns of the secondary coils 33f and 33f corresponding to the primary coils 33e and 34e is made equal. , 34c and the number of secondary coil winding grooves 33d, 34d may be other numbers, and the secondary coils 33 corresponding to the respective primary coils 33e, 34e.
Similar effects can be obtained even if the number of turns of f and 34f is not equal. Also, the capacitor discharge type high voltage generating coil for firing the HID lamp has been described as an example, but it is needless to say that the present invention can be applied to a capacitor discharge type high voltage generating coil for ignition of a gas combustor or gasoline engine.

[0021]

As described above, according to the present invention, the size and cost can be reduced, and a secondary voltage having a high peak value can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a high-voltage generating coil according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a waveform of a secondary voltage of the high-voltage generating coil shown in FIG.

FIG. 3 is an explanatory diagram showing a configuration of a high-voltage generating coil according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram of a typical HID lamp firing capacitor discharge high voltage generator.

FIG. 5 is an explanatory diagram showing a configuration of an example of a conventional high-voltage generating coil.

FIG. 6 is a diagram showing a waveform of a secondary voltage of the high voltage generating coil shown in FIG.

FIG. 7 is an explanatory diagram showing the configuration of another example of a conventional high-voltage generating coil.

8 is a diagram showing a waveform of a secondary voltage of the high voltage generating coil shown in FIG.

[Explanation of symbols]

 31-34 High voltage generating coil 31a-34a Iron core 31b-34b Bobbin 31ba-34ba Split winding flange 31c-34c Primary coil winding groove 31d-34d Secondary coil winding groove 31e-34e Primary coil 31f-34f Secondary Coil 31g-34g Insulation case 31h-34h Thermosetting resin

Claims (4)

[Claims] 1. A high voltage generating coil in which a primary coil and a secondary coil are wound around a bobbin, wherein the bobbin is formed of a synthetic resin, and a primary coil winding groove and a secondary coil winding groove are formed. A plurality of divided winding flanges each of which is divided into a plurality of sections are provided on an outer periphery, the secondary coil is wound around the plurality of secondary coil winding grooves, and the primary coil is wound around the plurality of primary coil winding grooves. A high-voltage generating coil, characterized in that: 2. A high-voltage generating coil in which a primary coil and a secondary coil are wound around the outer periphery of a bobbin, wherein the bobbin is formed of a synthetic resin to form a plurality of secondary coil winding grooves. A plurality of windings for the primary coil are provided on the outer circumference of the split winding flange, and the secondary coil is wound around the plurality of winding grooves for the secondary coil. A high-voltage generating coil, wherein the primary coil is wound around a wire groove. 3. The high-voltage generating coil according to claim 1, wherein the winding groove for the secondary coil is positioned at both ends, and the winding groove for the primary coil and the winding for the secondary coil are arranged. A high-voltage generating coil, wherein grooves and grooves are alternately arranged. 4. The high voltage generating coil according to claim 3, wherein the number of turns of the secondary coil wound around the secondary coil winding groove at both ends is equal to the number of turns of the other secondary coil winding groove. The high voltage generating coil, wherein the number of turns of the secondary coil to be wound is half.