JP3445830B2 - High voltage generator for two ports - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step-up transformer for boosting a discharge current from an electric circuit such as a capacitor charge / discharge circuit including a resistor, a rectifier, a capacitor, and a thyristor. Generating a high voltage from the output terminal of the step-up transformer,
The present invention relates to a two-port high-voltage generator that generates spark ignition at a discharge electrode. 2. Description of the Related Art As a device for generating a spark by an electric circuit alone and igniting a gas burner or the like, an AC power source as disclosed in Japanese Utility Model Publication No. 46-10543 is used. After rectifying by a control rectifier and accumulating electric charge in a capacitor, a current flows from the capacitor to the primary side of the step-up transformer, and a high voltage is taken out from the secondary side. There is something to make. Also, in a two-port high-voltage generator that enables two burners to be ignited by a single step-up transformer, two types of means have conventionally been used. That is, as shown in FIG. 7, a first means is wound around a single bobbin around a single primary coil a connected to an electric circuit section C wound around a magnetic core b. The step-up transformer T is formed by externally fitting the secondary coil d, and outputs are taken out from both sides of the secondary coil d. By the way, in this means, since it is necessary to discharge two discharge gaps with one secondary coil d, it is necessary to increase the power of the step-up transformer, so that a large magnetic field is generated and radiation noise is generated. And the risk of malfunctioning peripheral devices such as microcomputers. When one of the discharge gaps becomes dirty and becomes insulated, the other discharge gap becomes difficult to discharge. Furthermore, since the output is likely to be small, there is a problem that the discharge cannot be performed if the discharge electrode has a long distance discharge gap. As another means, as shown in FIG. 8, two primary coils a and a wound around magnetic cores b and b, and secondary coils d and wound around two independent bobbins, respectively. , D are externally fitted to form a step-up transformer T, and outputs are independently taken out from the secondary coils d, d. However, in such a means, it is necessary to separate them from each other in the axial direction in order to remove the influence of the noise generation voltage, and it is not substantially different from the one having two step-up transformers T, T. There is a disadvantage that the shape is enlarged and the igniter becomes large. [0005] In order to solve such a problem, as shown in FIGS.
a, a plurality of primary coils 7 wound in opposite directions around 6b, respectively
a, 7b are coaxially arranged, and secondary coils 8a, 8b are externally fitted to the primary coils 7a, 7b, respectively, so that a plurality of transformer sections 3a, 3b are arranged side by side in the axial direction. The input / output terminals from the electric circuit section C are electrically connected in parallel to the primary coils 7a and 7b of the sections 3a and 3b, respectively, and the high voltage boosted by the transformer sections 3a and 3b is applied to each of the secondary coils 8a and 3b.
A booster transformer 3 is proposed, which takes out from high voltage output pins 4a, 4b connected to a, 8b, and has two transformer sections 3a, 3b connected in parallel. In this configuration, both primary coils 7a,
Since the winding direction of the coils 7b is reversed and the magnetic fields generated from the respective coils are reversed, the magnetic fields cancel each other, and the generation of noise can be eliminated as much as possible.
Even if a and 7b are close to each other, there is no problem. For this reason, it is possible to take out a high-voltage output from each of the transformer sections 3a and 3b without affecting surrounding microcomputers and the like. On the other hand, in such a configuration, 2
Each of the transformer sections 3a and 3b is supported by a separate bobbin, and each secondary coil is wound around each bobbin after the start end of the mutual conducting wire is connected to the output pin, and the end is connected between each bobbin. In the floating state, it is twisted in a floating state to secure the electrical connection, and then it is inserted into the transformer case at the same time,
Although the temporary fixing projections 15 support the respective conductors, the conductors are lacking in a unity on the wiring, but the assembly is troublesome, and the secondary coil is likely to be disconnected during the assembly. In addition, assembling steps were required, and the yield was poor. An object of the present invention is to solve such a problem. According to the present invention, there is provided a bobbin in which winding portions are formed on the left and right sides of a bobbin, respectively. A take-out pin is implanted between the winding portions and output is provided at both ends. Pins are implanted, and two primary coils wound around a magnetic core are arranged in a row along the through hole for each winding portion in the through hole of the bobbin. Is connected to the take-out pin, and the secondary coil is wound and mounted in the opposite direction so that the end is connected to the output pin, so that a transformer section is formed on the left and right winding portions of the bobbin. The input and output terminals from the electric circuit section are connected to the primary coil of each transformer section so as to be electrically parallel, and the high voltage boosted from the secondary coil of each transformer section is taken out from the output pin. Characterized by having a step-up transformer It is a pressure generator. The two transformer sections are physically integrated via a bobbin. And the secondary coil is connected in the opposite direction to the winding portion provided on the left and right sides of the bobbin by connecting the starting end to the center take-out pin and rotating the bobbin in one direction,
Its termination is connected to the output pin. Thus, the secondary coils located on both sides of the take-out pin have opposite magnetic field directions, and the magnetic fields cancel each other out, so that noise generation can be eliminated as much as possible. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a two-port high-voltage generator according to the present invention will be described below with reference to FIGS. 9 and 10 have the same reference numerals. In FIGS. 2 and 3, reference numeral 1 denotes a substantially cuboid-shaped main body case having an open upper surface, inside which a step-up transformer 3 is provided.
Are enclosed by the insulating resin 2. As shown in FIG. 5, the step-up transformer 3 has a through hole 12 formed at the center thereof,
0a and 10b use the bobbin 9 on which the fractionation is formed as a supporting material. The winding portions 10a and 10b are formed by connecting a plurality of winding portions 11 defined by a plurality of flange pieces, and a connecting portion between the winding portions 10a and 10b includes:
Extraction pin 1 using hard copper wire coated with solder layer
3 are planted. Needle-shaped high-voltage output pins 4a and 4b are respectively implanted on both outer sides of the bobbin 9, and the tips thereof are projected downward. In the through hole 12 of the bobbin 9, rod-shaped magnetic cores 6a and 6b around which primary coils 7a and 7b are respectively wound are arranged coaxially corresponding to the winding portions 10a and 10b.
As shown in FIG. 5, the primary coils 7a and 7b have the same winding direction. Of the primary coils 7a and 7b wound on the magnetic cores 6a and 6b, the left end of the primary coil 7a in the figure and the left end of the primary coil 7b are connected by twisting, and the primary coil 7a The right end and the right end of the primary coil 7b are twisted and connected, and each is pulled out. In addition, temporary fixing protrusions 15, 15 are formed at the end of the bobbin 9, and the primary coils 7a,
7b are connected to the temporary fixing protrusions 15, 15 respectively.
And then twisted and connected to the conductor at the inner end. On the other hand, secondary coils 8a and 8b are wound around the winding portions 11 of the winding portions 10a and 10b. The starting ends of the secondary coils 8a and 8b are wound around the base end of the take-out pin 13 and are electrically connected to each other. By rotating the bobbin 9 in one direction, the secondary coils 8a and 8b are directed to both outer ends. As shown in FIG. 4, after winding in the reverse direction at the winding portions 10a and 10b, the ends thereof are connected to the output pins 4a and 4b.
4b. Then, a solder dip is applied to each of the extraction pin 13 and the output pins 4a and 4b to secure the connection. As described above, the secondary coils 8a and 8b are wound in the opposite directions at the winding portions 10a and 10b by rotating the bobbin 9 in one direction after being connected to the central take-out pin 13. And the directions of the mutual magnetic fields are reversed. For this reason, the directions of the respective magnetic fields are different, and the directions cancel each other. By winding the primary coils 7a, 7b and the secondary coils 8a, 8b inside and outside the bobbin 9 in this manner, the transformer sections 3a, 3b are arranged side by side in the axial direction, and the step-up transformer 3 is constituted. . Then, the step-up transformer 3 having such a configuration is accommodated in the main body case 1, and the output pins 4 a and 4 b pass through the lower bottom of the step-up transformer 3. Then, the respective drawn ends of the primary coils 7a and 7b are temporarily wound around the temporary fixing projections 16 formed on the corners of the main body case 1.
Thereafter, the body case 1 is filled with the insulating resin 2 and the step-up transformer 3 is sealed. In this configuration, output pins 4a and 4b protrude from the lower bottom of the main body case 1 on both sides thereof, and a ground take-out pin 13 protrudes from the center. Since the take-out pin 13 is made of hard copper wire covered with a solder layer, it is hard at the time of winding and becomes soft after the solder dip, so that the take-out pin 13 is bent as shown in FIG. Therefore, it is easy to insert the printed circuit board p into the through hole h. Therefore, the substrate can be assembled as it is, and there is no need to connect a separate lead wire as in the past. The two-port high-voltage generator having the above-described structure is provided with the temporary fixing protrusions 16, 1 of the primary coils 7a, 7b.
6 are connected to the input / output terminals of the electric circuit section C. Thus, the primary coil 7a and the primary coil 7b are electrically connected in parallel to the electric circuit section C as shown in FIG. The electric circuit section C may use an AC power supply. However, when the electric circuit section C is also used for a DC power supply such as a battery, a blocking oscillation circuit or the like is provided in the electric circuit section C to temporarily increase the DC voltage. I just need. In such a configuration, the current emitted by the electric circuit section C is boosted by the transformer sections 3a and 3b formed by the coils 7a and 8a and the coils 7b and 8b, respectively. At 4b, high voltages are respectively taken out, and discharge is performed at the discharge electrodes of the required two ignition devices, and the gas burners arranged near the discharge electrodes are ignited. At this time, when a voltage is applied to the primary coils 7a and 7b, a magnetic field is generated corresponding to the winding direction. However, as described above, the directions of the magnetic fields generated by the secondary coils 8a and 8b are different from each other. Noise generation is suppressed as much as possible. Therefore, there is no harm even if there is a device such as a microcomputer which is easily affected by a magnetic field around the device. According to the present invention, winding portions 10a and 10b are formed on the right and left sides of the bobbin 9, respectively, and the winding portions 10a and 10b are formed.
b, a takeout pin 13 is implanted between the two winding portions 10a, 1
0b, the secondary coils 8a, 8b connecting the starting ends to the takeout pins 13 are wound in opposite directions, and the ends are connected to the output pins 4a, 4b provided at both ends of the bobbin 9, respectively. Transformers 3a and 3b are formed on the left and right by primary coils 7a and 7b and secondary coils 8a and 8b wound inside and outside 10a and 10b, respectively. Therefore, both transformers 3a and 3b are integrated. And
Since it is easy to mount on the main body case 1 and the starting ends of the secondary coils 8a and 8b are connected by the take-out pin 13, the conductor is wired in a floating state between the winding portions 10a and 10b. However, for this reason, there is no occurrence of disconnection in the mounting process to the main body case 1. The left and right winding portions 10a, 1 starting with the take-out pin 13 as a starting end.
0b, the secondary coils 8a and 8b are wound in the same direction, respectively, so that the magnetic fields generated by the secondary coils 8a and 8b in the axial direction and in the opposite directions cancel each other out, There is an excellent effect that generation of radiation noise can be eliminated as much as possible, and influence on surrounding microcomputers can be suppressed as much as possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a basic configuration of the present invention. FIG. 2 is a partially cutaway front view of one embodiment of the present invention. FIG. 3 is a plan view of one embodiment of the present invention. FIG. 4 is a side view showing an outline of a step-up transformer 3 according to one embodiment of the present invention. FIG. 5 is a vertical sectional side view showing an outline of a step-up transformer 3 according to one embodiment of the present invention. FIG. 6 is a schematic side view showing an aspect of mounting on a printed circuit board p. FIG. 7 is a circuit diagram showing an example of a conventional two-port high voltage generator. FIG. 8 is a circuit diagram showing another example of a conventional two-port high voltage generator. FIG. 9 is a partially cutaway front view of still another embodiment of the conventional two-port high voltage generator. FIG. 10 is a vertical sectional side view showing an outline of the boosting transformer. [Description of References] 3 Step-up transformers 3a, 3b Transformers 4a, 4b Output pins 6a, 6b Magnetic cores 7a, 7b Primary coils 8a, 8b Secondary coils 9 Bobbins 10a, 10b Winding parts 12 Through holes 13 Extraction pins

Claims (1)

(57) [Claims 1] A take-out pin is implanted between winding portions of a bobbin having winding portions formed on the left and right, and output pins are provided at both ends. At the same time, the two primary coils wound around the magnetic core are arranged in a row along the through hole for each winding portion in the through hole of the bobbin, and the starting ends are taken out at both winding portions. The secondary coil is installed by winding the secondary coil in the opposite direction so that the terminal is connected to the output pin and the terminal is connected to the output pin.
Thereby, a transformer portion is formed in the left and right winding portions of the bobbin, and an input / output terminal from an electric circuit portion is connected to a primary coil of each transformer portion so as to be electrically parallel to each other. A high voltage generator for two ports, comprising: a boosting transformer configured to extract a high voltage boosted from a secondary coil of a transformer section from an output pin.