JP3291632B2 - Transformer for igniter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer for an igniter for generating a high voltage which is incorporated in an igniter incorporated in a burning appliance such as a boiler or a stove.

[0002]

2. Description of the Related Art An electric ignition device is incorporated in a burning appliance such as a boiler or a stove.

Since it is desirable to make the ignition device as small as possible, the transformer for the igniter, which occupies most of the installation space in the ignition device, must be minimized. Therefore, there is known an igniter transformer in which the entire winding is reduced by connecting the winding start of the primary winding and the winding start of the secondary winding to a common terminal.

In this device, a cored primary coil L1 is inserted around the axis of the bobbin B, and two sets of secondary coils L2a and L2b are wound around the outer periphery of the bobbin B (FIG. 8A). The beginning of each winding of the line L1 and the secondary winding L2a is common to the terminal B
1, the end of the primary winding L1, the end of the secondary winding L2a, the beginning of the secondary winding L2b, and the end of the winding, respectively.
In this order, the terminals B2, B3,..., B5 are drawn out (FIG. 4B). Since the terminals B1, B4 and B2 are terminals on the low potential side and the terminals B3 and B5 are terminals on the high potential side,
These terminals are separately arranged on both sides of the bobbin B. The terminal B4 is connected to the terminal B1 via external wiring.

In this device, a high voltage can be generated at the terminals B3 and B5 by applying a primary voltage of the cutting waveform to the terminals B1 and B2 via an appropriate switching circuit. At this time, since the voltages generated at the terminals B3 and B5 have the same polarity, the spark gaps connected to the terminals B3 and B5 can have uniform discharge characteristics. Furthermore, by connecting the beginning of the winding of the secondary winding L2a and the beginning of the winding of the primary winding L1 to the common terminal B1, the number of terminals can be reduced to reduce the overall size and to reduce the low potential. Since the terminal on the high side and the terminal on the high potential side can be mechanically separated, there is an advantage that it is convenient in mounting.

[0006]

In the prior art, since the primary winding and the secondary winding are not electrically insulated, power is supplied from a commercial power supply unless another insulating transformer is interposed. There was a problem that it was not possible. That is, the secondary side of the igniter transformer is a high-voltage circuit, and connection of such a high-voltage circuit to a commercial power supply without providing electrical insulation is not permitted by law. .

In view of the above-mentioned problems in the prior art, the object of the present invention is to draw two sets of secondary windings wound around the surface of a bobbin to terminals in the middle part of the bobbin with one end having the same polarity in common. To provide an igniter transformer that can electrically insulate the primary winding and the secondary winding reliably without increasing the overall size by drawing the other end to the terminals at both ends of the bobbin. is there.

[0008]

According to a first aspect of the present invention, there is provided a bobbin having barriers at both ends and an intermediate portion, and a centered bobbin inserted into an axial center of the bobbin. It consists of a primary winding and two sets of secondary windings wound between each barrier on the surface of the bobbin. Both ends of the primary winding are pulled out to terminals on the barrier at both ends, and each secondary winding is The gist of the invention is that one end of the same polarity is made common and drawn to a terminal on the barrier in the intermediate portion, and the other end is drawn to terminals on each barrier at both ends.

According to a second aspect of the present invention, there is provided a bobbin having barriers at both ends and an intermediate portion, at least one auxiliary bobbin connected in the axial direction of the bobbin with the barrier at one end outside, a bobbin, and an auxiliary bobbin. A cored primary winding to be inserted into the bobbin shaft, and three or more sets of secondary windings wound between barriers on the bobbin and auxiliary bobbin surfaces. Both ends of the primary winding are bobbins, The secondary winding on the bobbin is pulled out to the terminal on the barrier in the middle part, while the secondary winding on the bobbin is drawn out to the terminal on the barrier in the middle part, and the other end is drawn out to the terminal on each barrier on the outermost side of the auxiliary bobbin. While the secondary winding on the auxiliary bobbin is pulled out to the terminal on the barrier, one end of the same polarity as one end of the secondary winding on the bobbin to be commonly pulled out is drawn out to the terminal on the barrier closer to the bobbin, and the other end. The terminal on the barrier far from the bobbin And the gist of the invention to withdraw.

[0010]

According to the structure of the first aspect of the present invention, the number of terminals of the two sets of secondary windings can be reduced by drawing one end of the same polarity as a common terminal on the barrier in the middle part of the bobbin. Further, by pulling out both ends of the primary winding to the terminals on the barriers at both ends, and drawing the other end of the secondary winding to another terminal on the barriers at both ends, the low potential side terminal and the high potential side Can easily be mechanically separated from the terminal.

According to the configuration of the second invention, one end of the secondary winding on the auxiliary bobbin is a terminal on the low potential side and the other end is a terminal on the high potential side, and the former is on the barrier near the bobbin. And the latter can be pulled out to the terminal on the barrier far from the bobbin, so that any number of secondary windings can be easily added.

[0012]

Embodiments will be described below with reference to the drawings.

The igniter transformer has a bobbin 12 having barriers 12b, 12b, 12a at both ends and an intermediate portion.
And a cored primary winding L1 having a core 11, and a bobbin 1
2 and two sets of secondary windings L2a and L2b wound on the surface of the secondary winding 2 (FIGS. 1 and 2).

The core 11 is a rod-shaped ferrite core that can be inserted into the axial center of the bobbin 12. The primary winding L1 is formed by winding the core 11 a required number of times.
The winding start and the winding end are fixed by 1a or the like.

The bobbin 12 has flange-shaped barriers 12b, 12b, 12a at both ends and a central portion, and a thin auxiliary barrier 12c, 12b is provided between the adjacent barriers 12a, 12b.
c ... are formed. Barriers 12b, 12b at both ends
The terminals T11 and T12 for the primary winding L1 are horizontally inserted in the upper part of the barrier, and the lower parts of the barriers 12b and 12b are
Terminals T2a and T2b for the secondary windings L2a and L2b are fixed to penetrate horizontally. Further, a common terminal T2 for the secondary windings L2a and L2b is inserted in the same direction as the terminals T11 and T12 above the center barrier 12a.
T2 and T12 are printed circuit board P
It can be mounted on C as it is (two-dot chain line in FIG. 1).

The beginning and end of the winding of the primary winding L1 are drawn out along both side end surfaces of the bobbin 12, respectively, and the terminal T
11 and T12 (FIGS. 1 and 3). Further, the beginnings of the secondary windings L2a and L2b are combined on the barrier 12a in the middle part, and are commonly connected to the terminal T2.
Ends of the secondary windings L2a and L2b are respectively connected to terminals T2a and T2a.
It is assumed that it is connected to T2b.

Here, a deep transverse groove 12a1 reaching the body 12d of the bobbin 12 and a vertical groove 12a2 rising obliquely from the transverse groove 12a1 and reaching the base of the terminal T2 are formed in the middle barrier 12a. The winding start of the secondary windings L2a and L2b is drawn out to the terminal T2 via the transverse groove 12a1 and the vertical groove 12a2. In addition, the transverse groove 12a1 and the vertical groove 12a2
It is assumed that it is continuous via the slope 12a3 (FIG. 4).

Further, the windings of the secondary windings L2a and L2b are guided from the vertical groove 12a2 to the transverse groove 12a1 starting from the terminal T2 (FIG. 5), and are drawn out on both sides of the transverse groove 12a1. The trunk 12d between the auxiliary barriers 12c and the trunk 12d between the auxiliary barriers 12c, 12c are sequentially wound in the direction of the arrow in FIG.
b and 12b are connected to terminals T2a and T2b. However, each auxiliary barrier 12c is formed with a wedge-shaped transverse groove 12c1 reaching the body portions 12d on both sides.
FIG. 6), the winding crosses the auxiliary barrier 12c via the transverse groove 12c1. The transverse groove 12c1 is accompanied by a slope 12c2 that is inclined in the winding direction of the winding, and the winding is inclined down the slope 12c2 and the adjacent trunk 12c2.
d.

In such an igniter transformer, the terminal T2 is grounded, and the primary voltage L1 is applied to the primary winding L1 via the terminals T11 and T12, so that the secondary windings L2a and L2b are connected to the primary winding L1. A high voltage can be generated, and in the spark gap connected to the terminals T2a and T2b,
A spark for ignition can be generated. At this time, since the primary winding L1 and the secondary windings L2a and L2b are completely electrically insulated, the switching circuit for supplying power to the primary winding L1 must have any special insulating transformer interposed. Power can be supplied by a commercial power supply. The terminals T11, T2, and T12 are terminals on the low potential side, and the terminals T2a and T2b are terminals on the high potential side, and both are mechanically separated from each other.

[0020]

[Other Embodiments] An igniter transformer is provided with an auxiliary bobbin 13 on one side end surface of a bobbin 12 by using an auxiliary bobbin 13.
Three sets of secondary windings L2a, L2b, L2c can be provided (FIG. 7).

The auxiliary bobbin 13 has at one end a barrier 13a formed at both ends of the bobbin 12, and is connected in the axial direction of the bobbin 12 with the barrier 13a outside. At this time, the end of the primary winding L1 is drawn to the terminal T12 on the barrier 13a of the auxiliary bobbin 13, and the start of the secondary winding L2c is drawn to the terminal T21 on the barrier 12b in contact with the auxiliary bobbin 13. The end is drawn to the terminal T2c on the barrier 13a of the auxiliary bobbin 13. However, the secondary winding L2c is connected to the auxiliary bobbin 1
3 is wound in the same direction as the secondary winding L2b. The terminals T12 and T21 are arranged on the low potential side in the same direction as the terminals T11 and T2, and the terminal T2c is arranged on the high potential side in the same direction as the terminals T2a and T2b.

Similarly, if the auxiliary bobbin 13 is additionally provided, it is possible to mount an arbitrary number of secondary windings L2a, L2b,. Also, in that case,
The terminal on the low potential side and the terminal on the high potential side can be easily separated.

In the above description, the winding start of the secondary windings L2a and L2b drawn to the terminal T2 may be changed to the winding end. That is, in the present invention, as long as the common terminal T2 is one end of the same polarity of the secondary windings L2a and L2b, either the winding start or the winding end may be drawn. At this time, one end of the secondary winding L2c drawn to the terminal T21 has the same polarity as the ends of the secondary windings L2a and L2b drawn to the terminal T2.

[0024]

As described above, according to the first aspect of the present invention, one end having the same polarity of the secondary winding on the bobbin is connected to the terminal at the middle part of the bobbin, and the other end is connected to the terminal. By pulling out to the terminals at both ends of the bobbin, the low-potential side terminal and the high-potential side terminal are mechanically separated, and the primary and secondary windings are reliably electrically insulated. Therefore, there is an excellent effect that power can be supplied from a commercial power supply without reducing the overall size and without an extra insulating transformer. Further, according to the second aspect, by connecting the auxiliary bobbins, it is possible to provide an arbitrary number of three or more sets of secondary windings while maintaining the effects of the first aspect.

[Brief description of the drawings]

FIG. 1 is an overall perspective explanatory view.

FIG. 2 is a perspective view of a main part.

FIG. 3 Connection Diagram

FIG. 4 is an explanatory perspective view of a main part.

FIG. 5 is a view corresponding to an arrow X in FIG. 4;

FIG. 6 is a view corresponding to the arrow Y in FIG. 4;

FIG. 7 is a schematic plan view showing another embodiment.

FIG. 8 is a configuration explanatory view showing a conventional example.

[Explanation of symbols]

 L1 ... primary winding L2a, L2b, L2c ... secondary winding T11, T12, T2, T21, T2a, T2b, T2c ... terminal 11 ... core 12 ... bobbin 13 ... auxiliary bobbin 12a, 12b, 13a ... barrier

Claims (2)

(57) [Claims] 1. A bobbin having barriers at both ends and an intermediate portion, a cored primary winding inserted into an axial portion of the bobbin,
On the surface of the bobbin, two sets of secondary windings are wound around each of the barriers, and both ends of the primary winding are pulled out to terminals on the barrier at both ends,
A transformer for an igniter, wherein each of the secondary windings has one end of the same polarity and is drawn out to a terminal on the barrier in the intermediate portion, and the other end is drawn out to a terminal on each barrier at the both ends. 2. A bobbin having barriers at both ends and an intermediate portion, one or more auxiliary bobbins connected in the axial direction of the bobbin with the barrier at one end outside, and a shaft of the bobbin and the auxiliary bobbin. A cored primary winding inserted into the core,
On the surface of the bobbin and the auxiliary bobbin, there are three or more sets of secondary windings wound between the barriers, and both ends of the primary winding are terminals on the outermost barriers of the bobbin and the auxiliary bobbin. Each secondary winding on the bobbin has one end of the same polarity in common and is pulled out to a terminal on the barrier in the intermediate portion, and the other end is drawn out to a terminal on each barrier in the both ends. The secondary winding on the auxiliary bobbin draws one end of the same polarity as one end of the secondary winding on the bobbin to be commonly pulled out to a terminal on a barrier closer to the bobbin, and the other end is far from the bobbin. A transformer for an igniter, which is drawn out to the terminal on the side barrier.