JP2552112Y2 - Booster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a booster that generates a high voltage from an output terminal of an ignition transformer.

[Prior Art] In a device having a plurality of secondary voltage output terminals, such as a discharge booster for applying a high voltage to an ignition plug,
As shown in FIG. 5, a secondary bobbin d is inserted into a primary bobbin a around which a core c is inserted through a center hole and a primary coil b is wound.
A plurality of secondary coil winding portions e are disposed on the secondary bobbin d along the axial direction, and each secondary coil winding portion e is radially opposed to the primary coil b. The ignition transformer is configured to take out the boosted secondary voltages from the input / output terminal f of the secondary coil winding e.

[Problems to be Solved by the Invention] By the way, a plurality of secondary coil windings e are arranged outside of a single primary coil b to face a part thereof to extract a high voltage. If the winding density of the primary coil b varies in the axial direction, the voltage taken out from the input / output end f of each secondary coil winding e becomes non-uniform. For this reason, in the above-described discharge booster, the voltage applied to the ignition plug varies, which causes problems such as poor spark generation and a reduction in the life of the ignition plug due to excessive voltage application.

The purpose of the present invention is to eliminate the problems of the conventional structure.

[Means for Solving the Problems] The present invention is characterized in that a primary spiral coil is inserted into the primary side bobbin and a guide spiral groove is provided around the primary bobbin to uniformly guide the coil along an axis. Is what you do.

[Operation] By winding the primary coil in the guide spiral groove, the winding density of the coil becomes equal along the axial direction. For this reason, the voltage generated from each of the secondary coil winding portions wound around the secondary bobbin externally fitted to the primary bobbin becomes equal.

[Embodiment] An embodiment applied to a discharge booster according to the present invention will be described with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a substantially cuboid-shaped open-bottomed transformer case, in which a large number of insertion holes 2 are provided in one upper surface, and a high-voltage cord 30 is fitted into the insertion hole 2. Needle-like output terminals 3 are respectively implanted. The insertion hole 2
Are provided in large numbers so as to be applicable to, for example, a combustion apparatus having a plurality of gas burners.

The transformer case 1 has a built-in ignition transformer 5 according to the main part of the present invention, a printed board 8 is disposed on the ignition transformer 5, and the ignition transformer 5 and the printed board 8 are placed in an insulating molding material 6. It is buried. Lead wires 7, 7 for supplying power to the input end of the ignition transformer 5 are drawn out of the insulating molding material 6 through the through holes 8c of the printed circuit board 8.

Also, the connection pins 27 and 28 erected on the secondary bobbin 24 of the ignition transformer 5 and the rear end of the needle-shaped output terminal 3 are inserted into the through holes 8b and 8d of the printed circuit board 8, and the conductive The connection pins 27 and 28 are electrically connected to the high-voltage terminal 3 via the path 8a.

The insulating molding material 6 fixes the ignition transformer 5 and shuts off the heat generated therefrom so as not to affect the electric circuit section 16 having a heat-sensitive component such as a rectifying element described later. Is what you do.

On the other side surface of the case body 1, a gate-shaped fitting portion 10 is provided along both side edges and a lower edge. The fitting portion 10,
The crosspieces 11, 11 have a U-shaped cross section, and fitting grooves 12, 12 are formed. Further, a fitting groove 14 is formed at the lower end thereof in the width direction.

Reference numeral 15 denotes a printed circuit board on which an electric circuit section 16 including a capacitor, a resistor, a silicon controlled rectifying element and the like is mounted, and both ends of the printed circuit board 15 are fitted into the fitting grooves 12, 12 from above, and A plurality of fitting projections 17 formed on the lower edge of the printed board 15 are fitted into the fitting grooves 14, respectively, and protrude downward from the fitting grooves 14, and are attached to the side surface of the transformer case 1.

Conductive ends for supplying electricity to the electric circuit section 16 are printed on the fitting projections 17, and lead wires 7, 7 are connected to required conductive portions formed on the fitting projection 17 by soldering or the like.
Similarly, the input lead wire 18 is connected to the required conductive path.

In addition, mounting pieces 19, 19 each having a through hole are provided on the front and rear sides of the lower part of the transformer case 1, and bolts are screwed through the through holes and fixed at appropriate places.

Next, the configuration of the ignition transformer 5 according to the main part of the present invention is described in the second.
This will be described with reference to FIGS.

Reference numeral 20 denotes a primary bobbin. An iron core 21 is inserted into the center of the bobbin, and a primary coil 22 is wound around the core. A secondary bobbin 24 fits over the primary bobbin 20. This secondary bobbin 24 has 4
A plurality of divided circumferential grooves 26 are formed.
One coil is connected to and wound around each of the divided circumferential grooves 26 to form a single secondary coil winding portion 25. Therefore, the two secondary coil winding portions 25, 25
Are formed, and input / output side connection pins 27, 28 are provided upright at both sides of the coil winding portions 25, 25, respectively.
As described above, each is fitted into the through hole 8b of the printed circuit board 8 and connected to the needle-shaped output terminal 3 via the conductive path 8a on the printed circuit board 8. By the way, the secondary coil winding 2
5, 25 are radially opposed to half of the single primary coil 22. For this reason, if the winding density of the primary coil 22 varies, the outputs of the secondary coil windings 25 change. Therefore, as shown in FIGS. 4A and 4B, a guide spiral groove 23 is formed in the primary bobbin 20, and the primary coil 22 is fitted into the guide spiral groove 23 and guided to be wound. Therefore, the winding density of the primary coil 22 becomes equal along the axial direction of the primary bobbin 20, and the number of turns of each part of the primary coil 22 radially corresponding to the secondary coil winding portions 25, 25 becomes equal. Therefore, the electromagnetic induction is performed under the same conditions, and the output voltages generated from the respective needle-shaped output terminals 3 become equal.

This embodiment has the above-described configuration, and as shown in FIG. 1, a required high-voltage cord 30 is externally fitted to the high-voltage output terminal 3, and an AC power supply is connected to the lead wires 18 and 18 via appropriate switches. You. The switch is configured to be closed by, for example, opening a knob of a gas appliance. When power is supplied to the electric circuit section 16 by closing the switch, the current is rectified by a rectifying element or the like and electric charge is accumulated in a capacitor. A current flows from the capacitor to the primary coil 22 of the ignition transformer 5, and The high voltage generated from the coil windings 25, 25 is taken out from the output terminal 3 by the high voltage cord 30, and an ignition spark is generated at the discharge electrode.

[Effect] As apparent from the above description, the present invention provides a guide spiral groove 23 around the primary bobbin 20 so that the primary coil 22 can be uniformly wound along the axial direction. When taking output from each of the plurality of secondary coil winding portions 25, 25 provided around the secondary bobbin 24 externally fitted to the side bobbin 20, there is an excellent effect that an equal voltage can be generated.

[Brief description of the drawings]

The accompanying drawings show an embodiment of the present invention. FIG. 1 is a longitudinal side view of a discharge booster, FIG. 2 is a perspective view of a separated state viewed from below, and FIG. 3 is a partially cutaway plan view of an ignition transformer 5. , Fourth
4A is a perspective view of the primary bobbin 20, and FIG. FIG. 5 is a conceptual diagram of a conventional configuration. 1; Transformer case 5; Ignition transformer 20; Primary bobbin 22; Primary coil 23; Guide spiral groove 24; Secondary bobbin 25; Secondary coil winding

Claims (1)

(57) [Scope of request for utility model registration] 1. A secondary bobbin is externally fitted on a primary bobbin on which a primary coil is wound, and a plurality of secondary coil winding portions are disposed on the secondary bobbin along the axial direction. A booster device having an ignition transformer configured to make a secondary coil winding part radially opposed to a primary coil and take out a boosted secondary voltage from the secondary coil winding part. A step-up device having a guide spiral groove around which a coil is inserted and which guides the coil uniformly along an axis.