JPS5831384Y2 - Houdentouyo Antique - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ballast for a discharge lamp in a phase advance leakage transformer.

A conventional ballast for a discharge lamp using a phase advance leakage transformer has a slit or a constriction formed in the secondary coil winding part of the central leg core, and a bridge section formed by the slit or constriction. This increases the inductance by suppressing the saturation of the secondary core, thereby improving the ramp waveform.

As shown in FIG. 1, a leakage magnetic path protrusion 1 located between the primary coil 9 and the secondary coil is provided to protrude from the inner edge of the side leg core 2 toward the center leg core 3, and this leakage magnetic path By setting the width so that the excitation current does not pass through the first part of the protrusion and becomes saturated when the sum of the magnetic flux and the magnetic flux due to the load current, and the width becomes unsaturated when the difference becomes the difference, the secondary iron core □ Due to the increase in inductance due to the lees saturation control, the ramp waveform is increased by several '+m'.

・However, in the slit 'gt = leakage path projection 1 portion formed in the center leg iron core 3, polar saturation is likely to occur. There was a drawback that the magnetic flux concentration in the opposing oil content and the magnetic flux concentration area caused the increase in core loss due to polar saturation.The present invention was devised in view of the above drawbacks. Extremely satiated $0
This is a product that provides a ballast for electric lamps that aims to reduce ballast loss.

□Next, the structure of one embodiment of the present invention will be explained with reference to Figures 2 and 3.

■ : 10 is a laminated central leg iron core, with protrusions 11, 11 □'□ answer sleeve e on both sides of the two ends, and a cedar board 9 in the shape of an academic.

A primary coil 12 and a secondary coil 13 are wound around this central leg core 10.

In the winding portion of the secondary coil 13 of the central leg core 10, there is a slit 14.14 cut out in a substantially arc shape that widens toward the outer edges on both sides, and a bridge gap is formed between the slits 14.14. A saturable bridge portion 15 is formed.

Reference numeral 16.1116 denotes a pair of laminated side leg cores, one end of which is in contact with the protrusions 11, 11 of the center leg core 10, and the other inner edge is in contact with the outer edge of the center leg core 10. Protrusions 17, 17 that are in contact with each other are formed, and this both-side leg iron core 16°16
A coil arrangement space 18 is formed between the center leg core 10 and the center leg core 10 .

Further, a leakage magnetic path protrusion 19° 19 is protruded from the inner edge of the both side leg cores 16 and is disposed between the primary coil 12 and the secondary coil 13.

Widened portions 21.21 are formed at the tip portions of the leakage magnetic path protrusions 19.19 that are opposed to both outer edges of the central leg core 10 with a small distance 20 therebetween.

In such a configuration, the magnetic flux directed from the secondary coil 12 of the central leg core 10 to the secondary coil 13 is
14, 14, the magnetic flux density inevitably increases in the saturable bridging portion 15, which tends to cause polar saturation, but the arc-shaped sulin)
14. The saturable bridging portion 15 is formed by 14, and the front part of this saturable bridging portion 15 is formed into an arc shape in order to make it narrower, so that the magnetic flux is suppressed and saturation at the pole part is eliminated. It has become.

Further, a leakage magnetic path protrusion 19 formed on the side leg iron core 16.16 is located between the primary coil 12 and the secondary coil 13.
．． 19 has a widened portion 21 at its tip as shown in FIG.
21, the magnetic flux is widely dispersed in the central leg core 10 facing the protrusions 19 and 19, and the protrusions 19
．． In section 19, the width of the protrusion is set so that when the magnetic flux due to the excitation current and the magnetic flux due to the load current are the sum, saturable and difference, they are unsaturated, as described above, but this protrusion 19.19 The central leg iron core 10 suppresses saturation in the
The saturation of the magnetic flux in the vicinity of the projections 19, 19 facing the projections 19, 19 can be smoothed.

Therefore, by reducing the saturation at the pole portion, it is possible to suppress the saturation of the magnetic flux, reduce the beat and iron loss, and increase the inductance.

Furthermore, in this embodiment, when the side leg cores 16.16 are punched, the leakage magnetic path protrusions 19 of the side leg cores 16.16 are formed into substantially arc-shaped slits that form the saturable bridge portions 15 of the center leg cores 10. It can be formed by punching using 14, the material is suitable, the utilization rate of the iron core material is high, and it is economical.

According to the present invention, widened portions are formed at the tips of leakage magnetic path protrusions that protrude from both side leg cores that are opposed to each other with a small gap from the outer edge of the central leg core that forms an arcuate saturable bridge. Therefore, the saturable characteristic of the saturable bridge section is provided to suppress the saturation of the secondary core section, and when the magnetic flux due to the excitation current passing through the leakage magnetic path projection section and the magnetic flux due to the load current are summed, the difference in saturability is achieved. By setting the width of the protrusion so that it is unsaturated when Because the protrusion has parts with a large cross-sectional area and parts with a small cross-sectional area, the saturation of the magnetic flux is smooth, reducing whirring and iron loss, and the tip of this leakage magnetic path protrusion is widened, so the magnetic flux is dispersed. Saturation of the magnetic flux in the central leg is suppressed, and ballast loss is reduced as a synergistic effect due to the formation of the arc-shaped saturable bridge portion and the leakage magnetic path protrusion, making it possible to obtain an efficient discharge lamp ballast.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the iron core of a conventional ballast, FIG. 2 is an explanatory diagram of the iron core of the ballast of the present invention, and FIG. 3 is a plan view of the ballast showing an embodiment of the present invention. 10...Central leg iron core, 12...-Secondary coil, 13...Secondary coil, 15...
Saturable bridge portion, 16... Side leg core, 19...
...Leakage magnetic path projection, 20...Gap, 21...
... widening section.

Claims (1)

[Scope of utility model registration request] The central leg iron core is provided with side leg iron cores disposed on both sides of the central leg iron core, and a secondary coil and an alpha coil wound around the central leg iron core. An arc-shaped saturable bridging portion is formed in the secondary coil winding portion of the leg core, and is located between the secondary coil and the secondary coil and protrudes from the inner edge of the both leg cores, and is connected to the central leg core. 1. A ballast for a discharge lamp, characterized in that leakage magnetic path protrusions with widened tips are formed facing each other with an undetermined gap between them.