JP2006203254A - Leakage transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closed magnetic circuit type leakage transformer for multiple lights, which is of one input and multiple outputs, a small overall size, and thin and narrow so as to be able to be mounted in a narrow accomodation space and not to magnetically effect on outside. <P>SOLUTION: The transformer has individually wound secondary windings 12a and 12b. The secondary winding 12a is attached to an internal groove 4a and another secondary winding 12b is attached to an internal groove 4b. That is, a primary winding 10 is attached so as to include two secondary windings 12a and 12b. The transformer is provide with an upper core 2 and a lower core 8 that surround the primary wiring 10 and the secondary wirings 12a and 12b to form a closed magnetic path through which a magnetic flux formed by the primary wiring 10 and the secondary wirings 12a and 12b passes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a leakage transformer used in a DC / AC inverter circuit or the like for lighting a discharge lamp.

  In recent years, the screen size of a liquid crystal display device used for a notebook personal computer or the like tends to increase. Accordingly, the capacity of the backlight lamp of the liquid crystal display device is increased or the number of backlight lamps is increased. It is required to increase the number of lamps to be a multiple lamp type.

  The backlight lamp and the power supply circuit section for driving the backlight lamp are normally housed in a frame portion around the liquid crystal display device. However, the storage space of the frame portion is liquid crystal when the overall dimensions of the display portion are constant. The larger the screen, the narrower it becomes. However, in the case of a multi-lamp type in which the number of transformers is increased corresponding to the number of backlight lamps, the outer dimensions of the power supply circuit section increase with the increase in the number of transformers installed. The size must be increased, and the wiring between the power supply circuit section and the backlight lamp in the storage space becomes complicated.

  The present invention has been made in view of such a situation. It has one input and multiple outputs, has a small external dimension, particularly a thin and narrow width, and can be mounted in a narrow storage space. The present invention provides a closed magnetic circuit type multi-light leakage transformer that does not affect the outside.

  The leakage transformer according to the present invention includes a plurality of secondary windings, a primary winding around which the plurality of secondary windings are wound, the primary winding and the secondary winding. And a core that includes a winding and forms a closed magnetic path through which a magnetic flux generated by the secondary winding and the primary winding passes.

  In the leakage transformer according to the present invention, each secondary winding is magnetically coupled to the primary winding by a different magnetic path in the core.

  In the leakage transformer according to the present invention, the core includes the primary winding and the secondary winding, and the core forms a closed magnetic path through which the magnetic flux by the secondary winding and the primary winding passes. There is an effect that the secondary winding and the primary winding included in the core are not magnetically affected externally.

  Hereinafter, an example of the present invention will be described with reference to FIGS. 1 is a top view showing an example of a multi-lamp leakage transformer according to the present invention, FIG. 2 is a bottom view, FIG. 3 is a cross-sectional view taken along the line AA 'of FIG. 1, and FIG. 4 is BB' of FIG. 5 is a front view, FIG. 6 is a side view, FIG. 7 is a diagram showing an internal wiring state, FIG. 8 is an explanatory diagram of the upper core, (a) is a top view, and (b) is a bottom surface. FIG. 2C shows a partially sectional side view. 9A and 9B are explanatory views of the lower core. FIG. 9A is a top view, FIG. 9B is a bottom view, and FIG. 9C is a side view. In addition, the same code | symbol is attached | subjected to the same part in each part.

  Reference numeral 1 denotes an entire multi-lamp leakage transformer. Reference numeral 2 denotes an upper core, and two middle leg portions 3a and 3b are formed in the vicinity of the central portion of one surface thereof. Reference numerals 4a and 4b denote inner grooves, which are formed concentrically with the middle legs 3a and 3b, respectively. Reference numeral 5 denotes an outer groove portion, which is formed between the partition wall portion 6 and the outer peripheral wall portion 7 formed so as to surround the inner groove portions at the same time. 8 is a lower core arranged so as to form a closed magnetic circuit with the upper core 2. The lower core 8 is composed of a terminal block 9a in which terminals 111-117 are implanted and a terminal block 9b in which terminals 121-124 are implanted. It is pinched and fixed. Reference numeral 10 denotes a pre-wound primary winding, which is attached to the outer groove portion 5 of the upper core 2 and has a lead terminal connected to any one of the terminals 111, 112, 113. Reference numerals 12a and 12b are separately wound secondary windings, 12a is mounted in the inner groove 4a and its lead terminal is connected to the terminals 121 and 122, and the other secondary winding 12b is connected to the inner groove 4b. When attached, the drawer terminal is connected to terminals 123 and 124. That is, the primary winding 10 is mounted so as to include two secondary windings 12a and 12b. g1 is a magnetic gap formed between the partition 6 and the middle leg 3a on the secondary winding 12a side and the lower core 8, and g2 is below the partition 6 and the middle leg 3b on the secondary winding 12b side. It is a magnetic gap formed between the core 8. The upper core 2 and the lower core 8 are formed of a magnetic material having an insulating property, for example, a nickel-based ferrite core.

  In the above configuration, the primary winding 10 and the secondary winding 12a are coupled to the magnetic gap g1 through the middle leg 3a, and similarly, the primary winding 10 and the secondary winding 12b are connected to the magnetic gap g2. And it couple | bonds via the middle leg part 3b. Further, since the two secondary windings are arranged inside the primary winding and in the central portion of the upper core 2, the magnetic flux generated in the primary winding 10 is substantially equal to the two secondary windings. The two secondary windings are excited at the same time. Since the partition wall 6 is interposed between the secondary winding 12a and the secondary winding 12b, mutual magnetic interference is prevented. In the present embodiment, the two magnetic gaps g1 and g2 have the same width, and the number of secondary windings 12a and 12b is the same, so that the two output voltages are equal. However, different output voltages can be obtained by adjusting the coupling degree by changing the widths of the magnetic gaps g1 and g2 or by changing the number of windings of the secondary windings 12a and 12b.

  FIG. 10 is a structural diagram showing another example of the core used in the multiple-light leakage transformer of the present invention, in which the partition wall portion 6 is formed only in the middle portion of the space adjacent to the two secondary windings. Although the structure is simpler than that of the example, magnetic interference between adjacent secondary windings can be sufficiently prevented.

  FIG. 11 is an electrical connection diagram showing an example of a ballastless type discharge lamp lighting circuit using the multi-lamp leakage transformer 1 according to the present invention. Both ends of one secondary winding 12a are connected to the discharge lamp via a ground wire. The other secondary winding 12b is similarly connected to both ends of another discharge lamp 14b via a ground line. Thus, two discharge lamps 14a and 14b can be driven simultaneously for one input.

  As described above, a plurality of outputs can be obtained with respect to one input, magnetic leakage to the outside of the transformer can be prevented, and the external dimensions can be made small and thin. In addition, since the partition portion is formed between the adjacent secondary windings of the core that accommodates the primary winding and the secondary winding, magnetic interference with each other can be prevented. And the primary winding can be adjusted independently.

The top view which shows an example of the leakage transformer for multiple lights concerning this invention. The bottom view which shows an example of the leakage transformer for multiple lights concerning this invention. Sectional drawing in the A-A 'line of an example of the multiple light leakage transformer concerning this invention shown in FIG. Sectional drawing in the B-B 'line of an example of the multiple light leakage transformer concerning this invention shown in FIG. The front view which shows an example of the leakage transformer for multiple lights concerning this invention. The side view which shows an example of the leakage transformer for multiple lights concerning this invention. The figure which shows the internal wiring state in an example of the multiple light leakage transformer concerning this invention. It is explanatory drawing of the upper core in an example of the multiple light leakage transformer concerning this invention, (a) is a top view, (b) is a bottom view, (c) is a partial cross section side view. It is explanatory drawing of the lower core in the multi-lamp leakage transformer concerning this invention, (a) is a top view, (b) is a bottom view, (c) is a side view. FIG. 4 is a structural diagram illustrating another example of a core used in the multiple-light leakage transformer of the present invention, where (a) is a top view and (b) is a cross-sectional side view. FIG. 3 is an electrical connection diagram illustrating an example of a ballastless discharge lamp lighting circuit using the multi-lamp leakage transformer according to the present invention.

Explanation of symbols

1 ... Multiple light leakage transformer
2 ... Upper core
3a, 3b ... middle leg
4a, 4b ... Inside groove
5 ... Outer groove
6 ... partition wall
7 ... Outer wall
8 ... Lower core
9a, 9b ... Terminal block
10 ... Primary winding
111-117, 121-124 ... terminals
12a, 12b ... Secondary winding
g1, g2 ... Magnetic gap
13a, 13b ... discharge lamp

Claims (2)

A plurality of secondary windings;
A primary winding in which a winding is wound so as to surround the plurality of secondary windings;
A leakage transformer comprising: a core that includes the primary winding and the secondary winding and forms a closed magnetic path through which the magnetic flux generated by the secondary winding and the primary winding passes. The leakage transformer according to claim 1, wherein each secondary winding is magnetically coupled to the primary winding by a different magnetic path in the core.

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