JP5317167B2 - Horizontal transformer - Google Patents

Description

  The present invention relates to a horizontal transformer that is attached to a mounting board so that its winding axis is parallel to the mounting surface. More specifically, the exciting winding and the output winding are wound from one end of the winding frame and wound at the other end. It is related to a horizontal transformer with a structure in which the number of winding layers is set to an odd number so that the winding ends and the winding terminal at the beginning of winding and the winding terminal at the end of winding are distributed to the terminal holding portion at one end of the winding frame and the terminal holding portion at the other end. is there. This technique is useful for a low-profile (thin) power transformer.

  In recent years, as the screens of liquid crystal TVs, liquid crystal monitors, and the like have been increased, it is demanded that the thickness be further reduced. Therefore, the power transformer used for liquid crystal displays and the like is not a vertical structure in which the winding axis of the winding frame portion is perpendicular to the mounting surface and the magnetic material is arranged in the vertical direction, and the winding shaft of the winding frame portion is on the mounting surface. A horizontal structure is adopted in which magnetic materials are arranged in parallel in the horizontal direction.

  A horizontal transformer uses a bobbin in which a winding frame portion whose winding axis is parallel to the mounting surface and terminal holding portions located at both ends of the winding frame portion are integrally formed. The wire (primary winding) and the output winding (secondary winding) are wound in a state of being insulated from each other, and their winding terminals are connected to the terminals of the terminal holding portion. In this type of conventional horizontal transformer, the binding terminal at the beginning of winding of the excitation winding and the binding terminal at the end of winding are collected in the terminal holding portion at one end of the winding frame, and the binding terminal at the start of winding of the output winding This is a structure in which the winding end binding terminals are gathered in the terminal holding part at the other end of the winding frame part. That is, the terminal of one terminal holding part is for the excitation winding, and the terminal of the other terminal holding part is for the output winding, thereby ensuring a necessary insulation distance. Accordingly, both the exciting winding and the output winding are wound from one end (winding start end) of the winding frame portion toward the other end, and the winding is wound when the winding ends in the middle of the winding frame portion. Return to the winding start end at the pull-back line.

  However, in order to satisfy the demand for further reduction in height due to the increase in the output current accompanying the increase in screen size and the resulting increase in the wire cross-sectional area of the winding, the pullback wire of the winding must be satisfied. Even the thickness of the part is becoming difficult to ignore. This is because, since the current flowing through the winding is large, it is necessary to use a thick wire, and the pull-back line portion rises and protrudes. In addition, it is necessary to insulate by attaching a tape to the overlapping portion between the start and end of winding.

In order to solve such a problem, the winding is wound in a twin coil, and when the winding ends in the middle of the winding frame, a winding end line is connected to the terminal in the winding traveling direction at the end of winding. A method of extending and connecting to terminals in that direction has been proposed (see Patent Document 1). However, although the system using twin coils can be adopted for low voltage parts of 50V or less, it is difficult to adopt a transformer used for a line such as a commercial power supply because of safety standards. Moreover, since it is a twin coil, it is difficult to cope with a transformer in which the number of turns differs greatly between an excitation winding and an output winding such as a power transformer.
JP 2004-31517 A

  The problem to be solved by the present invention is to secure a sufficient creepage distance between the exciting winding and the output winding for insulation, and to suppress an increase in the thickness of the winding portion, thereby further reducing the lateral transformer. It is to try to be turned upside down.

In the present invention, a winding frame portion whose winding axis is parallel to the mounting surface and terminal holding portions positioned at both ends of the winding frame portion are formed continuously and integrally, and an excitation winding (primary winding) is formed on the winding frame portion. Wire) and the output winding (secondary winding) are wound in a state of being insulated from each other, and in the horizontal transformer in which those winding terminals are connected to the terminals of the terminal holding portion, the excitation winding and the output winding The wire has an odd number of winding layers so that all the wires start from one end of the winding frame and finish at the other end, and the winding terminal at the beginning and the winding terminal at the end of the winding are respectively connected to one terminal holding portion. And the other terminal holding part, and in both terminal holding parts, the entangled terminal of the excitation winding and the tangled terminal of the output winding are secured to the parts opposite to each other with respect to the winding axis. This is a horizontal transformer characterized in that it is arranged with a winding end unusable area. Here, the bottom surface of the terminal holding portion, the winding terminals allowed region that has raised the plateau relative to the winding draw-out surface.

  The excitation winding and the output winding start winding from one end (winding start end) of the winding frame part, and advance to the other end and finish winding (the number of winding layers is one layer), or one end of the winding frame part (start winding) From the end) to the other end, then to the beginning of the winding, to the other end, to the other end again, and to finish the winding (the number of winding layers is three layers). Here, the excitation winding and the output winding do not necessarily need to be configured by a single wire. At least one of them can have a winding configuration in which a required wire rod cross-sectional area and the number of turns are ensured by winding a plurality of wire rods around a winding frame portion and connecting them in parallel.

  As described above, an excitation winding and an output winding are wound on the winding frame, but in addition to these, an auxiliary winding for driving the power supply IC may be provided. In this type of auxiliary winding, only a very small amount of current flows, so the wire diameter of the winding wire may be small. Therefore, even if there is a retracting wire portion of the winding, the winding layer does not rise, so the number of winding layers is even including the retracting wire portion. It does not matter if it becomes a layer.

  In such a horizontal transformer, an excitation winding and an output winding are magnetically coupled by a magnetic core disposed so as to surround the inside and outside of the winding frame. The magnetic core may be a combination of, for example, an EE core or an EI core.

  The horizontal transformer according to the present invention has an odd number of winding layers so that both the excitation winding and the output winding start from one end of the winding frame and finish at the other end. Since the winding end binding terminal is distributed to one terminal holding part and the other terminal holding part of the winding frame part, there is no return line part of the winding, so there is no increase in thickness due to the return line part, Can be reduced in height. In addition, insulation can be performed for each winding, the excitation side and the output side can be easily insulated, and the number of turns of each winding can be adjusted. In addition, the winding terminal of the excitation winding and the binding terminal of the output winding are arranged in both terminal holding parts with a winding terminal non-permitted area in order to secure an insulation distance in a portion opposite to the winding axis. Therefore, the lead-out of the excitation winding and the output winding can be clearly distinguished by the region where the winding terminal is not possible, and it is possible to ensure reliability when a high voltage is applied and to adapt to safety standards.

  If the winding end impossible area is defined so that it rises in a plateau shape on the bottom surface of the terminal holding part with respect to the winding drawing surface, the winding end impossible area can be clearly recognized visually and the winding The terminal can be prevented from entering, and the effect of securing the creepage distance is further ensured, and the reliability is improved.

  One embodiment of a horizontal transformer according to the present invention is shown in FIG. A represents a side surface, B represents a winding structure, and C represents a bottom surface.

  This horizontal transformer has a structure in which a winding frame portion 10 having a winding axis xx parallel to the mounting surface and terminal holding portions 12a and 12b positioned at both ends of the winding frame portion 10 are integrally formed. Use bobbins. The winding frame portion 10 includes a rectangular cylindrical winding drum 14 having a winding axis as a central axis, and flanges 16 positioned at both ends thereof, and terminal holding portions 12a and 12b are continuous to the lower portions of the flange 16, respectively. . A plurality of terminals 18 project downward from both terminal holding portions 12a and 12b.

  An excitation winding (corresponding to a primary winding) 20 and an output winding (corresponding to a secondary winding) 22 are wound around the winding frame portion 10 while being insulated from each other. It is connected to the terminal 18 of the holding parts 12a, 12b. In the present invention, the number of winding layers of the exciting winding 20 and the output winding 22 is set to an odd number of layers so that one wire is wound from one end of the winding frame portion 10 and finished at the other end. Accordingly, the binding terminal at the beginning of winding is connected to one end (for example, the terminal holding portion 12a on the left side of the drawing in FIG. 1), and the binding terminal at the end of winding is connected to the other end (for example, FIG. 1). To the terminal holding portion 12b) on the right side of the drawing. In addition, the entangled terminal of the excitation winding and the tangled terminal of the output winding are connected to the portions opposite to each other with respect to the winding axis xx (for example, C in FIG. On the excitation side and the lower side are arranged on the output side, with a winding terminal impossible region 24 (the region is shown by hatching) for securing an insulation distance. Of course, no terminal is provided in the winding terminal impossible area 24. Here, the whole area where the winding terminal is impossible is formed as a plateau, but may have a structure in which protrusions are provided on both sides of the winding shaft to partition the winding terminal impossible area. Reference numeral 26 denotes a creeping tape provided for securing an insulation distance between the windings.

  In this embodiment, the winding terminal impossible region 24 is wound around the bottom surfaces of the terminal holding portions 12a and 12b so that the winding terminal impossible region 24 can be clearly recognized visually and the winding terminals do not enter the region. For example, it rises at a height of about the wire diameter of the wound wire or more so as to form a plateau with respect to the wire drawing surface. By setting the winding terminal unusable region 24 in this manner, a necessary insulation distance can be secured, reliability when a high voltage is applied, and safety standards can be adapted.

  Each winding terminal is entangled with the terminal 18 and soldered by immersing the entangled portion in molten solder. In addition, although the pin terminal is illustrated here, it may be an SMD (surface mount device) type terminal. By arranging the magnetic core 26 so as to surround the inner side and the outer side of the winding frame part 10, the excitation winding and the output winding are magnetically coupled. The magnetic core 26 is, for example, a combination of an EE core or an EI core, and a closed magnetic circuit is formed so that the middle leg of the E core is inserted into the winding drum and the outer leg surrounds the outside.

  As described above, the number of winding layers of each winding is set to an odd number, and the winding start binding terminal and the winding end binding terminal are divided into one terminal holding portion and the other terminal holding portion. That is, one winding wire rod is advanced from one end (winding start end) of the winding frame portion and finished at the other end (the number of winding layers is one), or when the number of turns is large, Winding is started from one end (winding start end) of the winding frame portion, and when it reaches the other end, it is rewound, and it is wound again from one end and finished at the other end (the number of winding layers is three). When the winding is completed in the middle of the winding frame, it is pulled out in the winding advance direction. Thereby, since the winding is not pulled back, an increase in thickness due to the portion can be suppressed.

  Further, since each winding can be insulated, the excitation side and the output side can be easily insulated, and the number of turns of each winding can be adjusted. In order to make the number of winding layers an odd number, the wire diameter and the number of wires of each winding may be adjusted so that the necessary total wire cross-sectional area can be secured. For example, two wires having a wire diameter of 0.4 mm are used on the excitation side, and these wires are connected in parallel. With such a winding configuration, it is possible to secure a necessary wire cross-sectional area and wind it by a necessary number of turns, so that the number of winding layers can be reduced to one so that the winding starts from one end of the winding frame and ends at the other end. . Similarly, on the output side, the number of winding layers is set to an odd number of layers by adjusting the wire diameter and the number of winding wires so that a necessary cross-sectional area can be secured.

  In the present invention, the terms “excitation winding” and “output winding”, not the terms “primary winding” and “secondary winding” are generally used in the category of primary winding or secondary winding. This is because, unlike the excitation winding and the output winding, winding pullback may be performed in some cases. For example, an auxiliary winding for driving a power supply IC may be provided outside the exciting winding and the output winding. Since such an auxiliary winding only allows a minute current to flow, a thin wire can be used. Even if the auxiliary winding is pulled back, the thickness of the transformer is hardly affected. Therefore, auxiliary windings other than the excitation winding and the output winding are an exception, and the number of winding layers is not necessarily an odd number.

Explanatory drawing which shows one Example of the horizontal type | formula transformer which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Winding frame part 12a, 12b Terminal holding | maintenance part 14 Winding drum 16 Flange 18 Terminal 20 Excitation winding 22 Output winding 24 Winding terminal impossible area 26 Magnetic core

Claims (4)

A winding frame portion whose winding axis is parallel to the mounting surface and terminal holding portions located at both ends of the winding frame portion are formed continuously and integrally, and the excitation winding and the output winding are insulated from each other on the winding frame portion. In a horizontal transformer that is wound in a state where the winding ends are connected to the terminals of the terminal holding unit,
The excitation winding and the output winding have an odd number of winding layers so that both wires start from one end of the winding frame and finish at the other end. The terminals are divided into one terminal holding part and the other terminal holding part, and the entangled terminal of the excitation winding and the tangled terminal of the output winding are arranged in opposite directions with respect to the winding axis in both terminal holding parts. The bottom of the terminal holding part located at both ends of the winding frame portion is arranged on the platen with respect to the winding lead surface. Horizontal transformer characterized by swelling in a shape . Excitation winding and an output winding at least one of the winds a plurality of wire rods to the winding frame portion, by connecting them in parallel, placing claim 1 Symbol wire cross-sectional area and number of turns that need is ensured Horizontal transformer. The horizontal transformer according to claim 1 or 2, wherein an auxiliary winding for driving the power supply IC is provided on the winding frame in addition to the excitation winding and the output winding. Horizontal transformer according to any one of claims 1 to 3 output winding and the excitation winding by the magnetic core disposed to surround the inner and outer winding frame section is magnetically coupled.

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