JP2007311516A - High voltage transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high voltage transformer capable of reducing the height dimension of the high voltage transformer without largely changing a conventional component configuration, and also reducing the outer diameter of a transformer body. <P>SOLUTION: The high voltage transformer includes: a coil 300 for fitting coil bobbins where winding wire is wound around the axis of a core 10; and a component block 100 for mounting a plurality of diodes 40 to be connected to the start end and terminal end of the winding wire, and also a plurality of electronic components to be connected to the terminal end part with high voltage generated by the winding wire. The coil, the diodes, and the block are stored in an exterior case having a substantially square shape. The center of the coil and the center of the substantially square shape exterior case are made to be eccentric, so as to differ the distances from the outer circumference of the coil to both the side surfaces of the exterior case. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a configuration of a high-voltage transformer that supplies a DC high voltage.

  The structure of a conventional high voltage transformer (Patent Document 1) will be described with reference to the drawings.

  FIG. 4 is a plan view and a side view of a conventional high voltage transformer.

  In FIG. 4, a high voltage transformer 580 has a configuration in which a coil portion 505, a diode holder 530, and a hocus volume 570 are combined and housed in a substantially cylindrical outer case 540 formed of plastic resin and filled with an insulating resin. ing.

  More specifically, the high voltage transformer 580 includes a primary coil bobbin 510 fitted around the axis of the core 500, a primary winding is wound around the primary coil bobbin 510, and a secondary coil is wound around the outer periphery of the primary coil bobbin 510. The secondary coil bobbin 520 is fitted and the secondary coil bobbin 520 is divided into a plurality of secondary windings, and each divided secondary winding portion is alternately arranged with an insulating film. And a diode holder 530 equipped with a plurality of diodes 531, and a focus volume 570 equipped with a high voltage capacitor 571 and a high voltage resistor.

  In the substantially cylindrical outer case 540, the center of the outer case circumferential portion 542 other than the mounting portion of the hocus volume 570 is the same as the center of the coil portion 505, and the outer case circumferential portion 542 and the coil portion 505 are concentric. The distance from the secondary winding of the secondary coil bobbin 520 to the inner surface of the outer case circumferential portion 542 is an equal distance.

  A low voltage terminal pin 550 is disposed on the primary coil bobbin 510 from the outer case opening 543 of the high voltage transformer 580, and the low voltage terminal pin 550 is inserted into a hole of the printed circuit board 560 and electrically connected. It has become.

  Conventionally, the high voltage transformer 580 is used in a color television receiver using a cathode ray tube, a display device used in a computer terminal, and the like, and is arranged vertically on the printed circuit board 560. The height to the top of the voltage transformer 580 is increased. Furthermore, the transformer main body and the core 500 provided with the diode holder 530 with the diode 531 mounted are arranged in a perpendicular direction when viewed in plan, and the outer diameter of the main body of the high voltage transformer 580 is increased.

  A high-voltage capacitor 571 and a hocus volume 570 provided with a high-voltage resistor 572 are mounted and fixed to the exterior case side opening 541, and a transformer between the high-voltage capacitor 571 and the high-voltage resistor 572, the diode holder 530, and the diode 531. Although the insulation distance from the inside of the main body can be secured, the high voltage components such as the high voltage capacitor 571 and the high voltage resistor 572 are fixed in direct contact with the hocus volume case 574.

  The structure of a conventional converter transformer (Patent Document 2) will be described with reference to the drawings.

  FIG. 5 is a cross-sectional view and a bottom view of a conventional converter transformer.

  In FIG. 5, a transbobbin 120 is disposed on the outer periphery of a core 110, and primary and secondary windings 130 are wound around the transbobbin 120. The primary and secondary windings 130 are The insulating structure is such that the interlayer insulating tape 132 is wound so as to come into contact.

  Further, the transformer bobbin 120 protrudes below the transformer terminal pin 140 from the lower surface. The transformer terminal pin 140 is soldered and joined to the through hole 202 of the printed circuit board 200 on which the primary side circuit component 210 and the secondary side circuit component 220 are mounted and electrically wired, thereby forming a transformer body.

  The transformer body is inserted into an insulating case 950 having a substantially square shape, and the insulating case 950 is filled with an insulating filler 400.

  Further, the transformer terminal pin 140 housed in the insulating case 950 is joined to the through hole 802 of the mount substrate 800 by soldering from below the opening of the insulating case 950.

The planar shape of the transbobbin 120 is a circle, square, or rectangle, and the center of the transbobbin 120 is set to the center of the circle, the center of the square, or the center of the short side or long side of the rectangle. The distances Ld1 and Ld2 to the transbobbin rods 121 provided at both ends of the transbobbin 120 have the same dimensions. Furthermore, since the voltage generated by the winding 130 is the same voltage at a symmetrical position from the center of the transbobbin 120, the distances Le1 and Le2 from the transbobbin rod 121 to both side surfaces 951 of the insulation case 950 have the same insulation distance. It is set to keep. Therefore, the distances Lf1 and Lf2 from the center of the core 110 to both side surfaces 951 of the insulating case 950 are the same distance.
JP 2001-176727 A JP 2000-060125 A

  Conventional Example FIG. 4 shows a schematic configuration viewed from the front when a high voltage transformer 580 is mounted on a printed circuit board 560. In the configuration of the conventional example, the high voltage transformer 580 is arranged in the longitudinal direction of the primary coil bobbin 510, that is, in the vertical direction of the printed circuit board 560, and the high voltage transformer 580 is mounted on the printed circuit board 560 of the set. The problem that the height dimension from the surface of the printed circuit board 560 to the apex of the high voltage transformer 580 becomes large, and the high voltage transformer 580 and the core 500 are arranged in a perpendicular direction, and the outer diameter of the main body of the high voltage transformer There is also a problem that becomes larger.

  For example, when the high voltage transformer 580 is used for a thin television, the printed circuit board 560 of the thin television set is vertically arranged, which causes a problem that the depth dimension of the television becomes large. However, the voltage at the bottom of the high voltage transformer 580 that contacts the printed circuit board 560 is low, and there is no need to consider the insulation distance from the printed circuit board 560.

  However, the high-voltage transformer 580 has a structure in which the outer case circumferential portion 542 has a uniform insulation distance from the coil portion 505, and the hocus volume case 574 has a structure in which high-voltage components such as a high-voltage capacitor 571 and a high-voltage resistor 572 are directly fixed. The insulation distance between the internal components of the transformer main body and the high voltage components of the hocus volume 570 is secured, but the hocus volume case 574 has variations in the expansion coefficient, adhesion, etc. of the epoxy resin filled in the transformer. This may cause the interface between the epoxy resin and the holding portion of the internal high voltage component attached to the hocus volume 570 to be peeled off and leak from the high voltage portion of the high voltage component to the surface of the hocus volume case 574. .

  The creepage distance between the high-pressure part and the hocus volume case 574 is designed with sufficient consideration. However, if a substance that inhibits adhesion to the epoxy resin adheres to the hocus volume case 574, etc. It is expected that high-pressure leakage will occur along the interface between the holding portion of the high-pressure component of the hocus volume 570 and the epoxy resin.

  Therefore, the printed circuit board 560 of the display device device on which the high voltage transformer 580 is mounted is often mounted with electrical components separated from the periphery of the high voltage transformer 580 by a certain spatial distance. In the case of a flyback transformer used in a display device device using a cathode ray tube, the generated voltage is as high as about 20 kV to about 33 kV, so the spatial distance from the flyback transformer, which is a high voltage transformer, to the peripheral parts is reduced. In some cases, the length is 10 mm to about 15 mm, and there is a problem that the printed circuit board 560 must be enlarged.

  Conventional Converter The transformer of FIG. 5 has an insulating case 950 in which the printed circuit board 200 on which the primary circuit component 210 and the secondary circuit component 220 are mounted and electrically wired is positioned between the transbobbin 120 and the mount substrate 800. Since it is provided, there is a problem that the height from the mount substrate 800 to the top surface of the substantially square insulating case 950 is increased.

  The present application solves the above problems, and can reduce the height direction of the high-voltage transformer (from the printed circuit board to the top of the transformer) without greatly changing the conventional component configuration. An object is to provide a high voltage transformer capable of reducing the outer diameter.

  In order to solve the above-described conventional problems, a high voltage transformer according to the present invention includes a coil portion in which a coil bobbin having a winding wound around a core axis is fitted, and a plurality of windings connected to the start and end of the winding. And a component block portion on which a plurality of electronic components connected to a high-voltage terminal generated by the winding are mounted, and the coil portion, the diode, and the block portion are substantially square-shaped exterior cases And the center of the coil part and the center of the substantially rectangular outer case are decentered to make the distance between the outer periphery of the coil part and both side surfaces of the outer case different.

  In the high voltage transformer of the present invention, the distance from the side surface of the exterior case that contacts the printed circuit board to the center of the coil portion is larger than the distance from the side surface of the exterior case that does not contact the printed circuit board to the center of the coil portion. It is.

  With this configuration, the high voltage transformer becomes a substantially square-shaped transformer and the thickness is reduced.

  According to the high voltage transformer of the present invention, the molded part containing the coil part and the diode holder and the electrical parts is disposed at a position facing the leg part of the core, and the center of the coil part and the transformer body of the substantially rectangular outer case By decentering the center, changing the distance between the transformer body and both sides of the outer case, and increasing the distance between the center of the coil and the side of the outer case on the side in contact with the printed circuit board, Since the insulation distance is insulated with the epoxy resin filled in the high voltage transformer, it is possible to provide a substantially square-shaped transformer having a thin high voltage transformer without increasing the thickness of the high voltage transformer.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a substantially bottom surface of a high-voltage transformer according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view of the high-voltage transformer according to Embodiment 1 of the present invention.

  1 and 2, the high-voltage transformer according to the first embodiment of the present invention is a substantially square shape that is formed of a plastic resin by combining three configurations of a coil unit 300, a diode holder 45, and a component block 100. It is housed in the outer shape case 240 and filled with an insulating resin.

  In the high voltage transformer, as shown in FIG. 1, the coil unit 300, the diode holder 45, and the component block 100 are housed in a straight line in a substantially square outer case 240. The high-voltage transformer is arranged around the diode holder 45 so as to be opposed to the coil unit 300, and the coil unit 300, the diode holder 45, and the component block 100 are arranged in a substantially square shape when viewed in a plan view, thereby forming a transformer body. ing.

  More specifically, the coil unit 300 has the primary coil bobbin 25 fitted around the axis of the core 10, the primary winding 20 is wound around the primary coil bobbin 25, and the primary coil bobbin 25 is wound around the outer periphery of the primary coil bobbin 25. The secondary coil bobbin 35 is fitted and the secondary winding 30 is divided into a plurality of parts and wound around the secondary coil bobbin 35, while the divided secondary windings 30 are insulated. Alternating with film.

  The diode holder 45 includes a plurality of diodes 40 between the windings connected to the starting end and the terminal end of the secondary winding 30, and the core square leg portion 11 that does not fit the coil portion 300 around the coil portion 300. It is deployed against.

  The component block 100 includes a first ceramic substrate resistor 60, a second ceramic substrate resistor 65, and a high-voltage capacitor 50 that are printed on a ceramic substrate connected to a high voltage termination generated by the secondary winding 30. , 55 and a plurality of electronic parts are arranged separately from the diode holder 45 and arranged on both sides of a plate-like substrate molded of a plastic material in a substantially square shape according to the size of each electronic part. In this configuration, the engaging portion and the concavo-convex portion are integrally formed on both surfaces of the plastic substrate so that the components can be held, and the first ceramic substrate resistor 60, the high-voltage capacitor 50, and the like are mounted and fixed.

  As described above, the high voltage transformer is arranged centering on the diode holder 45 so as to face the coil unit 300, and the coil unit 300, the diode holder 45, and the component block 100 are arranged in a substantially square shape when viewed in plan. . The coil unit 300, the diode holder 45, and the component block 100 have three configurations. The coil unit 300, the diode holder 45, and the component block 100 constitute a transformer main body and are housed in a substantially square outer case 240.

  The lead wire 52 of the high-voltage capacitor 50 passes through the notch 180 and is connected to the input / output terminal pin 253 embedded in the substrate terminal block 142 disposed on the back surface of the component block 100, so that the first ceramic substrate resistance The ground lead wire 61 of the device 60 is connected to the input / output terminal pin 252 embedded in the substrate terminal block 141 disposed on the back surface of the component block 100, and the ground lead wire 66 of the second ceramic substrate resistor 65 is The board terminal block 141 connected to the input / output terminal pin 252 embedded in the board terminal block 141 disposed on the back surface of the component block 100 and other electrical components is also disposed on the back surface of the component block 100 in the same manner. The terminal block and the terminal pin are arranged in a line.

  The input / output terminal pins 250, 252, and 253 have a structure extending to the side surface portion 241 of the substantially square shape outer case, and the end portion of the upper portion 242 of the substantially square shape outer case opening surface has a fixed interval in a row. The provided cutout portion 243 is formed, and the input / output terminal pins 254 extend to the substantially square-shaped exterior case side surface portion 241 on the primary coil bobbin 25 of the coil portion 300 and are arranged in a row in the same manner as the component block 100. When the coil unit 300, the diode holder 45, and the component block 100 are assembled and then inserted into the substantially rectangular outer case 240, the input / output terminal pins 250, 252, 253 and the input / output terminal pins of the primary bobbin 254 has a structure in which the position is fixed in a notch 243 provided at a predetermined interval on the upper surface 242 of the substantially square-shaped exterior case opening surface.

  The input / output terminal pins 254 of the primary coil bobbin 25 and the input / output terminal pins 250, 252, and 253 of the component block 100 are inserted into holes in the printed circuit board of the display device device, and the side surface portion 241 of the substantially square-shaped outer case 240 is formed. It has a structure that can be connected to and connected to the printed circuit board. On one side of the printed circuit board, electrical wiring is made with copper foil on the side that does not contact the high voltage transformer, and the copper foil part and the high voltage part inside the high voltage transformer are close to each other In this state, the distance between the transformer main body and both sides of the substantially square-shaped exterior case 240 is changed, and the side of the substantially square-shaped exterior case on the side contacting the center of the coil unit 300 and the printed circuit board. The distance to 241 is increased.

  Next, the insulation distance between the structures of the high voltage transformer of the present invention will be described.

  As shown in FIG. 1, the distance from the coil part center 301 that is the center of the coil part 300 to the tip of the flange of the secondary coil bobbin 35 is La1 and La2, and the substantially square-shaped exterior case side part 241 from the coil part center 301. Lc1 and Lc2 are distances to the second outer case side surface part 246, and Lb1 is a distance from the flange of the secondary coil bobbin 35 to the substantially square-shaped outer case side part 241 and the second outer case side part 246. Let Lb2.

  La2, Lb2, and Lc2 are distances on the side where the printed circuit board of the display device device and the high voltage transformer do not contact, such as the distance from the coil portion center 301 to the second exterior case side surface portion 246, and La1, Lb1, and Lc1 are coils. This is the distance on the side where the printed circuit board and the high-voltage transformer are in contact with each other, such as the distance from the center 301 to the side surface portion 241 of the substantially square shape outer case.

  The secondary coil bobbin 35 has a structure in which a flange is provided at both ends of a hollow cylindrical portion, and the flange has a circular shape centered on the coil portion center 301. Therefore, as shown in FIG. The distance to the outer periphery is the same design La1 = La2.

  Since the distance between the flange of the secondary coil bobbin 35 and the side surface of the substantially rectangular shaped outer case is set to Lb1> Lb2, Lc1,> Lc2, the high voltage portion inside the high voltage transformer and the copper foil of the printed board Insulation distance from electrical components mounted on the printed circuit board can be secured.

  The side surface portion 246 on the side of the second exterior case that is not in contact with the substantially square-shaped exterior case 240 and the printed circuit board is configured to have a clearance of about 10 mm to about 15 mm with the peripheral components, so that an insulation distance is ensured. it can.

  Finally, a circuit diagram in the high voltage transformer configuration of the present invention as described above will be described.

  FIG. 3 is a circuit diagram of the high-voltage transformer in the first embodiment of the present invention. In FIG. 3, the components arranged inside the broken line E constitute the coil unit 100, the components arranged inside the broken line C constitute the diode holder 45, and the components arranged inside the broken line D Constitutes the component block 100.

  The interior of the transformer body is composed of the core 10, the primary winding 20 and the secondary winding 30, and a plurality of diodes 40 are mounted inside the diode holder 45, and the high voltage capacitors 50 and 55, Voltage protection resistors 70 and 75, a first ceramic substrate resistor 60 and a second ceramic substrate resistor 65 are mounted.

  With such a configuration, the coil unit 300 diode holder 45 and the component block 100 are accommodated in the substantially square-shaped outer case 240, and the component block 100, the diode holder 45, and the coil unit 300 are located at positions facing the core square leg portion 11. The input / output terminal pin 254 of the coil unit 300 and the input / output terminal pin for connecting to each electronic component arranged in the component block 100 can be provided with a substantially square shape outer case opening upper surface 242. The input / output terminal pins can be protruded from the side surface of the substantially square-shaped exterior case 240.

  Furthermore, it is possible to secure an insulation distance to the copper foil and components of the printed circuit board of the display device device in which the high voltage transformer and the high voltage transformer are mounted, and the thickness of the high voltage transformer is thin. A high voltage transformer can be provided.

  In the above description, the case where the present invention is applied to the high-voltage transformer of the present invention has been described as an example, but the present invention can also be applied to a form in which the circuit in the component block 100 is changed.

  The present invention relates to a high voltage transformer that uses a high voltage and supplies it to devices, devices, and the like that require a thin transformer.

Sectional drawing of the substantially bottom face of the high voltage transformer in Embodiment 1 of this invention Schematic cross-sectional view of the high-voltage transformer in Embodiment 1 of the present invention Circuit diagram of high-voltage transformer in Embodiment 1 of the present invention Plan view and side view of conventional high voltage transformer Sectional view and bottom view of conventional converter transformer

Explanation of symbols

10 Core 11 Core Square Leg 20 Primary Winding 25 Primary Coil Bobbin 30 Secondary Winding 35 Secondary Coil Bobbin 40 Diode 45 Diode Holder 50 High Voltage Capacitor 52 Lead Wire 55 High Voltage Capacitor 60 First Ceramic Substrate Resistor 61 Earth Lead Wire 65 Second ceramic substrate resistor 66 Ground lead wire 70 High voltage protection resistor 75 High voltage protection resistor 100 Component block 141 Substrate terminal block 142 Substrate terminal block 180 Notch portion 240 Roughly square shape Exterior case 241 Roughly square shape Side surface portion of outer case 242 Upper portion of opening surface of substantially rectangular shape outer case 243 Notched portion 246 having a predetermined interval 246 Side surface portion of second outer case 250 Input / output terminal pin 252 Input / output terminal pin 253 Input / output terminal pin 254 Input / output terminal Pin 300 Coil part 301 Le part Center

Claims (2)

Connected to a coil portion fitted with a coil bobbin wound around a core axis, a plurality of diodes connected to the start and end of the winding, and a high voltage end generated by the winding A component block portion on which a plurality of electronic components are mounted,
The coil part, the diode, and the block part are housed in a substantially square-shaped outer case, and the outer periphery of the coil part and the outer case are made eccentric with the center of the coil part and the center of the substantially rectangular outer case. A high-voltage transformer characterized in that the distance to both sides of the is different. In a high-voltage transformer that is mounted in contact with the printed circuit board side surface of the outer case,
The distance from the side surface of the exterior case that contacts the printed circuit board to the center of the coil part is larger than the distance from the side surface of the exterior case that does not contact the printed circuit board to the center of the coil part. The high voltage transformer according to 1.

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