JPH10189080A - High-voltage generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a connection of a grounding terminal plate for a high- voltage generator. SOLUTION: A grounding terminal plate 20 comprises a main plate part 21 in which a screw hole 22 to insert a fixing screw is formed and a U shape connecting branch 23 expanding from one edge of the main plate member 21. Also, under the condition wherein the main plate member 21 is attached on a attachment flange 8 of a case, an insertion rod part 26 formed at an edge of the U-shape connecting branch 23 is inserted in a through hole 12 of a printed circuit board 10 to connect so that the grounding terminal plate 20 is connected to a grounding electric path of the printed circuit board 10. Therefore, an electrical connection is always ensured by keeping a connection with the through hole 12 even if a heat impact is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage generator for generating a high voltage from an output terminal of an ignition transformer, and more particularly to a ground connection means.

[0002]

2. Description of the Related Art As a high-voltage generator used as an ignition source for various combustion appliances such as an oil fan heater and a gas stove, a primary coil is wound around a center hole of a coil bobbin around which a secondary coil is wound. It is known that an ignition transformer configured by inserting an iron core is mounted on a printed circuit board on which a charge / discharge capacitor or the like is mounted and stored in a case.

As a high-voltage generator of this type, an ignition transformer is housed in a case, a printed circuit board is attached to an opening of the case, and a mounting flange formed on a side surface of the case is provided with:
It is proposed that a ground terminal plate is provided and electrically connected to the ground circuit on the printed circuit board, and a fixed screw inserted into the mounting flange is connected to the ground terminal plate to secure the ground connection. Have been.

[0004]

By the way, in the above-mentioned construction, as shown in FIG. 7, the ground terminal plate c mounted on the mounting flange b of the case a is connected to the plate from the edge of the main plate portion. A connecting rod d is projected along the surface, and the connecting rod d is penetrated through the side surface of the case a, and is connected to the conductive path of the printed circuit board p attached to the opening of the case a. d is overlapped and connected to the ground circuit on the printed circuit board p by soldering g. And the printed circuit board p
An insulating material e such as urethane resin is filled on the top.

Incidentally, this type of high-voltage generator is often used in a high-temperature atmosphere such as an oil fan heater, and is subjected to a large thermal shock. Due to the difference in the expansion rate or the heat shrinkage rate, the insulating material e causes displacement with respect to the printed circuit board p and the case a, a load is applied in the surface direction to the soldering g, and solder cracking occurs, and the connecting rod d is formed. In some cases, the electrical connection with the ground circuit was damaged. An object of the present invention is to eliminate such a problem.

[0006]

According to the present invention, there is provided a ground terminal plate comprising: a main plate portion having a screw insertion hole into which a fixing screw is inserted;
An extended side portion bent downward from one edge thereof, a transverse side portion bent at a right angle from the extended side portion, and from the transverse side portion,
It is further bent upward and has a U-shaped connecting branch serving as an insertion rod portion inserted into the through hole of the printed board from below, and the main plate portion of the ground terminal plate abuts the upper surface of the mounting flange of the case. As the mounting seat, a vertical mounting hole corresponding to the screw insertion hole is formed in the mounting flange, and an elongated hole that passes through the mounting hole and penetrates the side wall of the case is formed. Then, a U-shaped connecting branch penetrates upward from the elongated hole, and furthermore, an insertion rod portion is inserted from below into a through hole of the printed circuit board so that the ground terminal plate is disposed in the case.

[0007] Since the ground terminal plate has the insertion rod portion inserted into the through hole of the printed circuit board and is connected to the ground electric path formed on the printed circuit board, even if a thermal shock is applied to the through hole, the mechanical hole is inserted into the through hole. Electrically connected, electrical connection is always ensured.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a high voltage generator for electric discharge used for an oil fan heater or the like will be described with reference to the accompanying drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a substantially rectangular parallelepiped synthetic resin case which has two cylindrical portions 2 and 2 formed on one side surface thereof. Are provided with secondary output terminals 3 and 3 to which a high-voltage cord (not shown) is fitted. On the other hand, a rectangular projection 4 is formed on the lower surface of the other side, and primary side input terminals 5a and 5b are formed through connection holes 6 and 6 formed in the rectangular projection 4. At both sides of the case 1, mounting flanges 7 and 8 each having a mounting hole are formed. The ground terminal plate 20 is mounted on one of the mounting flanges 8 as described later. The ground terminal plate 20 is fixed to a fixing screw 30 (FIG.
In this case, the shape is omitted and the form is omitted), and the ground is secured.

In the opening of the case 1, a printed circuit board 1 is provided.
0 is deposited. An ignition transformer 11 and the like are mounted on the printed board 10, as shown in FIG. The winding start end and the winding end of the primary coil of the ignition transformer 11 are connected to the input terminals 5a and 5b via a conductive path formed on the printed circuit board 10 or directly. One end of the secondary coil is connected to the output terminals 3 and 3. The other end of the secondary coil is connected to the printed circuit board 10.
It is connected to the earth terminal plate 20 via the above earth electric circuit. Furthermore, the printed circuit board 10 is filled with an insulating material 13 so that the exposed surface of the printed circuit board 10 is electrically insulated and protected.

Next, the main part of the present invention will be described. The ground terminal plate 20 has a screw insertion hole 2 into which the fixing screw 30 is inserted.
A U-shaped connecting branch 23 is formed at the edge of the main plate portion 21 on which 2 is formed. This U-shaped connecting branch 23 is formed by extending an edge 24 bent downward from one edge of the main plate 21.
And a transverse side portion 25 which is bent at a right angle from the extension side portion 24.
And an insertion rod portion 26 which is further bent upward from the transverse side portion 25.

On the other hand, the upper surface of the mounting flange 8 of the case 1 is provided with a planar shape that matches the shape of the main plate 21 so that the main plate 21 of the ground terminal plate 20 can be seated thereon. A mounting seat 27 having a groove surface slightly deeper than the thickness of the mounting 21 is formed. A vertical mounting hole 28 is formed in the mounting flange 8 so as to coincide with the screw insertion hole 22 of the main plate portion 21. Further, a long hole 29 passing through the center of the mounting hole 28 is formed in the front-rear direction, and the inner end thereof passes through the side wall 9 of the case 1. The length of the elongated hole 29 is substantially equal to the length of the insertion rod 26 of the ground terminal plate 20.

In such a structure, the ground terminal plate 2
The mounting means of No. 0 will be described. First, as shown by the solid line in FIG.
6 at the position directly above. Then, the insertion rod portion 26 is moved in parallel so that the elongated hole 29 penetrates to the position indicated by the chain line in FIG. In this position, the U-shaped connection branch 23 is slightly moved inward to be able to tilt. Then, as shown in FIG. 6, the insertion rod 26 is formed in the through hole 1
Insert into 2 from below. Thus, the main plate portion 21 is attached to the mounting seat 2.
7 and the screw insertion hole 22 is substantially concentric with the mounting hole 28. The through hole 12 is subjected to soldering or the like, so that an electrical connection between the conductive layer formed on the inner peripheral surface of the through hole 12 and the insertion rod portion 26 is ensured. This allows
The ground terminal plate 20 is connected to a required ground circuit of the printed circuit board 10.

As described above, the ground terminal plate 20
Is inserted vertically into the elongated hole 29,
By further tilting, the main plate portion 21 of the ground terminal plate 20 comes into contact with the mounting seat 27 and the insertion rod portion 26 is inserted into the through hole 12, so that the ground terminal plate 2 can be easily formed.
0 can be attached to the mounting collar 8. After the ground terminal plate 20 is mounted, the printed circuit board 10 is filled with the insulating material 13 to complete the high-voltage device according to the present invention.

With this configuration, when a voltage is applied to the primary input terminals 5a, 5b, a high voltage is induced in the secondary coil of the ignition transformer 11, and this high voltage is applied to the secondary output terminals 3, 3 It is taken out by the cord and is used to generate an ignition spark.

In the high voltage generator having such a configuration, since it is used as an ignition source for various combustion appliances such as an oil fan heater and a gas stove, heating and cooling are constantly repeated. As a result, thermal shock acts on the case 1, the printed circuit board 10 and the insulating material 13, and contraction and expansion are repeated. However, the insertion rod portion 26 of the ground terminal plate 20 is inserted into the through hole 12 and mechanically connected. Therefore, such thermal shock does not impair the electrical connection.

[0017]

As described above, according to the present invention, the ground terminal plate 20 is formed by connecting a main plate portion 21 having a screw insertion hole 22 into which a fixing screw is inserted and a U-shaped connecting branch extending from one edge thereof. 23
The insertion rod 26 formed at the end of the U-shaped connecting branch 23 is inserted into the through hole 12 of the printed circuit board 10 with the main plate 21 mounted on the upper surface of the mounting flange 8 of the case 1. And the ground terminal plate 20 is connected to the ground circuit of the printed circuit board 10, so that even if a thermal shock is applied, the connection with the through hole 12 is maintained,
The electrical connection is always ensured.

Further, as described above, the ground terminal plate 2
The main plate portion 21 of the ground terminal plate 20 is brought into contact with the mounting seat 27 by inserting the insertion rod portion 26 into the elongated hole 29 formed in the mounting collar 8 and tilting the insertion rod portion 26 vertically. Since the portion 26 is inserted into the through hole 12, there is an excellent effect that the ground terminal plate 20 can be easily mounted on the mounting flange 8.

[Brief description of the drawings]

FIG. 1 is a plan view of a high voltage generator.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of the case 1 as viewed from below.

FIG. 4 is a perspective view of a ground terminal plate 20;

FIG. 5 is a vertical sectional side view of a main part showing a mounting process of the ground terminal plate 20.

FIG. 6 is a longitudinal sectional side view of a main part showing a mounting state of the ground terminal plate 20.

FIG. 7 is a longitudinal sectional side view of a main part of a conventional configuration.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 case 8 mounting flange 10 printed board 12 through hole 13 insulating material 20 ground terminal plate 21 main plate portion 22 screw insertion hole 23 U-shaped connecting branch 24 extending side portion 25 crossing side portion 26 insertion rod portion 27 mounting seat 28 mounting hole 29 Long hole

Claims (1)

[Claims] An ignition transformer is housed in a case, a printed circuit board is attached to an opening of the case, and a ground terminal plate is provided on a mounting flange formed on a side surface of the case. In a high-voltage generator electrically connected to a ground circuit and connected to a ground terminal plate with a fixing screw inserted into the mounting flange, a ground screw is inserted into the ground terminal plate. A main plate portion having an insertion hole formed therein, an extended side portion bent downward from one edge thereof, and a transverse side portion bent at a right angle from the extended side portion,
A U-shaped connecting branch which is bent upward further from the transverse side portion and is an insertion rod portion inserted into the through hole of the printed circuit board from below, and an upper surface of the mounting flange of the case is provided with a ground terminal plate. As a mounting seat against which the main plate portion abuts, a vertical mounting hole corresponding to the screw insertion hole is formed in the mounting flange, and a long hole penetrating the side wall of the case across the mounting hole is formed. A U-shaped connecting branch is penetrated upward from the long hole, and an insertion rod portion is inserted into a through hole of the printed circuit board from below to arrange the ground terminal plate in the case. High voltage generator.