JP2005101579A - Fly-back transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a fly-back transformer which prevents the poor soldering of components to each other on a component fixing plate and reliably fixes a plurality of component fixing plates. <P>SOLUTION: A component fixing plate has a through hole surrounded like a hollow cylinder for passing lead wires. Three lead wires, i.e., a lead wire of a capacitor and two lead wires of a first and second diodes are inserted in and fixed to the through hole. The first component fixing plate has a first rib having a square column having a trapezoidal top end and extensions in two directions from the trapezoid bottom side. The second component fixing plate has two second ribs each having a square column having a triangular top end and an overhang in one direction from one side of the triangle. The trapezoid bottom side is meshed with the one side of the triangle to fix the two component fixing plates. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a high-voltage generating flyback transformer for a television receiver or display device using a CRT.

  A flyback transformer is used in a television receiver or a display device using a CRT, and is a transformer for generating a high voltage used in these devices.

  First, the configuration of the flyback transformer will be described with reference to the circuit diagram of FIG. The core 4 is arranged at the center, the primary winding 31 is wound around a primary bobbin arranged in a cylindrical shape with the core 4 as a magnetic core, and the secondary winding 12 is concentric with the primary winding 31. The secondary winding is divided into a plurality of layers on a cylindrical secondary bobbin, and the layers of each layer are insulated by an insulator so that the phase of the voltage generated in each layer is the same. Each layer of 12 is connected to the anode side of the first diode Dn1 at the start, connected to the capacitor Cn in series with the end of the secondary winding 12, and the other end of the capacitor Cn is connected to the cathode side of the first diode Dn1. Are connected to the anode side of the second diode Dn2, and the cathode side of the second diode Dn2 is connected to the starting end of the next layer. Due to such connection, the voltage generated in the secondary winding divided into a plurality of layers is stacked to generate a high voltage.

As described above, the configuration of the flyback transformer requires not only the core as the magnetic core and the primary and secondary windings, but also components such as diodes and capacitors. The arrangement, holding, and connection of these electronic components are necessary. Necessary. As a prior art for that purpose, there is one having a configuration in which a component fixing plate is provided and an electronic component such as a diode is arranged, held, or connected (see, for example, Patent Document 1).
JP-A-53-51430

  The content required for flyback transformers is diversified, and wiring variations and new additional functions are required. As a matter of course, it is required to secure an insulation distance between each component and stably guarantee reliability, and to cope with this so as not to impair productivity and accuracy standardization.

  However, in the configuration according to the above prior art, after installing the component fixing plate, the components or the secondary winding and the lead wires cut to an appropriate length are soldered. It is easy to make a mistake. In addition, since the inspection of the connection portion is often performed by visual inspection, such a structure may cause a leakage of inspection for a connection defect such as insufficient soldering.

  In addition, there are cases where the number of parts increases as the specifications of the flyback transformer, and when a plurality of parts fixing plates are required, the configuration of the prior art cannot cope with them, and these parts fixing plates are required due to space requirements. Since the flyback transformer is arranged at an angle of 90 degrees with the magnetic core of the flyback transformer as the center, the space where the secondary bobbin is sufficiently fixed cannot be secured at the portion where they contact at an angle of 90 degrees, and the parts are fixed. The board may be insufficiently fixed.

  In order to solve the above problems, a flyback transformer of the present invention includes a second electronic component on a component fixing plate, for example, one end of a capacitor, a first electronic component, for example, a cathode side of a first diode, and a third electronic component. For example, the component has a through hole through which a lead wire can be passed through a solder holding portion surrounded by a hollow cylinder formed on the component fixing plate for connecting the anode side of the second diode. The height of three portions of the hollow cylindrical shape on the fixed plate and a shape in which a part of the outer wall of the cylinder is cut is changed, and a slope is provided on the outer wall toward the open surface of the cylinder.

  A flyback transformer comprising a first component fixing plate and a second component fixing plate arranged at an angle of 90 degrees with the magnetic core of the flyback transformer as a center, wherein the first component fixing plate Has a first rib with a trapezoidal tip at the end of the quadrangular prism, and a trapezoid base extending in two directions from the quadrangular column, and the second component fixing plate has a triangular shape at the tip of the quadrangular prism, Two second ribs projecting from the quadrangular column in one direction are arranged symmetrically so as to sandwich the first rib, and the trapezoidal base portion projecting from the first rib and the second rib The first component fixing plate and the second component fixing plate are fixed by engaging one side of the protruding triangular shape.

  The flyback transformer of the present invention having the above-described configuration is configured by inserting only the lead wire of the capacitor or the lead wire of the first diode or the second diode into the through hole of the solder holding portion provided on the fixed plate, respectively. The lead wires are in contact with each other and fixed, and solder connection by soldering is facilitated. Furthermore, by having a through hole, visual confirmation of the soldering state of the soldered portion from the back surface of the component fixing plate is facilitated.

  In addition, in the two component fixing plates arranged at an angle of 90 ° with the magnetic core of the flyback transformer as a center, the other component fixing plate is fixed by a protrusion provided on one component fixing plate, so that the secondary bobbin The number of fixing ribs can be reduced, and the component fixing plate can be firmly fixed. In addition, the secondary bobbin mold configuration is advantageous, and the shape of the flyback transformer can be reduced.

  The present invention is performed without changing the conventional components or production method without changing the basic configuration of the conventional flyback transformer. Therefore, it is based on using each conventional component and production equipment as they are.

  That is, a core is arranged in the center, the primary winding is wound around a primary bobbin arranged in a cylindrical shape with the core as a magnetic core, and the secondary winding is concentric with the primary winding and has a cylindrical shape. The secondary bobbin is divided into a plurality of layers, and the layers of each layer are insulated by an insulator so that the phase of the voltage generated in each layer is the same. The anode side of the first diode is connected to the capacitor, a capacitor is connected in series with the end of the secondary winding, and the other end of the capacitor is connected to the cathode side of the first diode and the anode side of the second diode. The cathode side of the second diode is connected to the beginning of the next layer. Due to such connection, the voltage generated in the secondary winding divided into a plurality of layers is stacked to generate a high voltage. Connection of the second electronic component on the component fixing plate such as one end of the capacitor, the first electronic component such as the cathode side of the first diode, and the third electronic component such as the anode side of the second diode without changing this configuration. A through hole through which a lead wire can be passed through a solder holding portion surrounded by a hollow cylindrical shape formed on the component fixing plate, and the hollow cylindrical shape on the component fixing plate The height of three portions of the shape of the cylindrical outer wall cut out is changed, and a slope is provided on the outer wall toward the open surface of the cylinder. A flyback transformer comprising a first component fixing plate and a second component fixing plate arranged at an angle of 90 degrees with the magnetic core of the flyback transformer as a center, wherein the first component fixing plate Has a first rib with a trapezoidal tip at the end of the quadrangular prism, and a trapezoid base extending in two directions from the quadrangular column, and the second component fixing plate has a triangular shape at the tip of the quadrangular prism, Two second ribs projecting from the quadrangular column in one direction are arranged symmetrically so as to sandwich the first rib, and the trapezoidal base portion projecting from the first rib and the second rib The first component fixing plate and the second component fixing plate are fixed by engaging one side of the protruding triangular shape.

(Embodiment 1)
FIG. 1 shows three heights of a shape 24 in which a through hole 23 is provided in a solder holding portion 22 surrounded by a hollow cylinder provided on a fixing plate 2 according to the present invention and a part of the outer wall of the cylinder is cut away. Further, it is an explanatory diagram of a structure in which a lead wire terminal is inserted and soldered into the solder holding portion 22 provided with a slope 25 toward the open surface of the cylinder.

  In FIG. 1, 1 is a secondary bobbin, 2 is a component fixing plate, 4 is a core, Dn1 is a first diode in the nth layer, Dn2 is a second diode in the nth layer, Cn is a capacitor in the nth layer, 22 is a solder holding portion on the fixing plate, 23 is a through hole provided in the solder holding portion, 24 is a notch in a part of the outer wall of the solder holding portion on the component fixing plate, and 25 is a cylinder of the solder holding portion. An inclined surface facing the open part of the cylinder of the outer wall, 8 is a soldering part. FIG. 2 is an enlarged view of the solder holding portion and a cross-sectional view of the solder holding portion according to the first embodiment of the present invention.

  Since the present invention does not change the basic configuration, the circuit diagram of the flyback transformer in FIG. 9 is common to the present invention. That is, the core 4 is arranged in the center, the primary winding 31 is wound around the primary bobbin 3 arranged in a cylindrical shape with the core 4 as a magnetic core, and the secondary winding 12 is connected to the primary winding 31. The concentric and cylindrical secondary bobbin 1 is divided into a plurality of layers, each layer is insulated by an insulator, and is configured in a stacked manner so that the phase of the voltage generated in each layer is the same. Each layer of the secondary winding 12 is connected to the anode side of the first diode Dn1 at the start end, the capacitor Cn is connected in series with the end of the secondary winding 12, and the other end of the capacitor Cn is connected to the first diode Dn1. Are connected to the anode side of the second diode Dn2, and the cathode side of the second diode Dn2 is connected to the start of the next layer.

  In this configuration, the first diode Dn1, the second diode Dn2, and the capacitor Cn are arranged on a component fixing plate arranged in parallel with the center line of the cylinder of the secondary bobbin 1. The connection between one end of the capacitor Cn, the cathode side of the first diode Dn1, and the anode side of the second diode Dn2 is a hollow cylindrical shape provided on the component fixing plate, and a shape in which a part of the outer wall of the cylinder is cut away. A soldering portion 8 having a through hole 23 through which a lead wire can be passed, which is surrounded by a hollow cylindrical shape in which the height of three portions 24 is changed and a slope is formed on the outer wall toward the open surface of the cylinder Soldered with a soldering iron. After the solder connection, the excess portion of the capacitor lead wire protruding from the back surface of the component fixing plate or the excess portion of the diode lead wire is cut to complete the connection. In this state, the connection state can be easily confirmed visually from the lead wire cut side.

  FIG. 3 is an enlarged view and a cross-sectional view of a solder holding portion of an example in which the lead connection of the electronic component according to the present embodiment is different. In contrast to the first embodiment, the lead wire of the capacitor Cn and the first diode Dn1 and further the second diode Dn2 are inserted and fixed and soldered by a soldering iron or the like.

  As described above, the lead wire of each electronic component is held by the hollow cylindrical solder connection portion on the component fixing plate in the soldering operation, and the soldering operation is performed. Soldered in a stable state without moving or separating the lead wires. Furthermore, since it is surrounded by a cylindrical shape, the distance is ensured without the solder connection portion coming into contact with other portions. Furthermore, the state of soldering can be visually confirmed from the back surface through the through hole.

  Furthermore, by changing the height of each of the three locations of the hollow cylindrical shape of the solder connection portion and the shape 24 in which a part of the outer wall of the cylinder is cut off, the respective lead wires overlap each other and the solder is easily stabilized between the lead wires. And then wrap around.

  As described above, the soldering operation is stable and the insulation distance between each part can be secured to ensure stable reliability. In addition to reducing solder connection mistakes in the process, solder connection mistakes can be easily detected and defective products can be detected. Outflow to the subsequent process can be prevented and production loss is reduced.

  FIG. 4 is an enlarged view and a cross-sectional view of a solder holding portion of an example in which the lead connection of the electronic component in the present embodiment is different. In contrast to the first embodiment, only the lead wire of the capacitor Cn is inserted and fixed in the through hole 23 and soldered by a soldering iron or the like. That is, the cathode side of the first diode Dn1 and the anode side of the second diode Dn2 are arranged without passing through the through hole. The lead wires of the first diode and the second diode are slightly fixed at the time of soldering work, but the work of inserting each lead wire into the through hole is reduced and simplified.

  FIG. 6 is an enlarged view and a cross-sectional view of a solder holding portion of an example in which the lead connection of the electronic component in the present embodiment is different. In contrast to the first embodiment, soldering with a soldering iron is facilitated by providing a hollow cylindrical shape of the solder connection portion and an inclined surface 25 on the outer wall of the cylinder toward the open surface of the cylinder.

(Embodiment 2)
FIG. 7 is an explanatory view of a method of fixing with a rib provided on a component fixing plate arranged at an angle of 90 degrees around the magnetic core of the flyback transformer according to the present invention. That is, it has a polygonal columnar projection rib 21 provided on the first component fixing plate 2a and a polygonal columnar hole provided on the secondary bobbin 1, and has a space for insertion into a prism whose one surface is open. Inserted into the prism 13 or provided on the secondary bobbin 1 with the rib 27 extending in one direction from the quadrangular column with one side of the triangle formed into a triangular shape at the tip of the rectangular column provided on the first component fixing plate 2a The first component fixing plate and the secondary bobbin 1 are fixed by engaging the ribs 14 with one side of the triangle projecting in one direction from the rectangular column. . Further, the first component fixing plate 2a has a trapezoidal shape at the tip of the quadrangular column, and has a first rib 26a projecting the trapezoidal base in two directions from the quadrangular column, and the second component fixing plate 2b is a quadrangular column. The tip has a triangular shape, and there are two second ribs 26b with one side of the triangle projecting from the quadrangular prism in one direction. The trapezoidal bottom portion of the first rib 26a projects and the projecting triangle of the second rib 26b. By engaging one side of the shape, the first component fixing plate 2a and the second component fixing plate 2b are fixed. As a result, the two component fixing plates are fixed to the secondary bobbin 1 and are fixed between the component fixing plates.

  As described above, since the two component fixing plates are fixed to the secondary bobbin and fixed by the component fixing plates by using the structure as shown in FIG. 7, the insulation distance between the components is ensured and reliable. It is possible to stably guarantee the performance and to handle the flyback transformer during production. Furthermore, it is possible to reduce somewhat the complicated shape in the mold production for forming this fixed portion on the secondary bobbin. That is, in order to mold a fixed part on a cylindrical secondary bobbin at an angle of 90 degrees, the structure of the molding die is a general pin gate injection molding, and the fixed part uses a slide core or the like. In order to form it in two directions at an angle of 90 degrees, the slide core must be further increased. The shape of this slide core can be simplified as much as possible.

  A flyback transformer according to the present invention is excellent in solderability of components on a component fixing plate and can securely fix a plurality of component fixing plates. A flyback for generating high pressure in a television receiver or a display device. Useful as a transformer.

Configuration diagram of component fixing plate of flyback transformer according to Embodiment 1 of the present invention 1 is a detailed configuration diagram of a solder holding unit according to Embodiment 1 of the present invention. 1 is a detailed configuration diagram of a solder connection portion according to Embodiment 1 of the present invention. The detailed block diagram of the solder connection part which concerns on Embodiment 2 of this invention 1 is a detailed configuration diagram of a solder holding unit according to Embodiment 1 of the present invention. The detailed block diagram of the solder holding part which concerns on Embodiment 3 of this invention Configuration diagram of flyback transformer according to Embodiment 4 of the present invention Detailed configuration diagram of the rib according to the fourth embodiment of the present invention Flyback transformer circuit diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Secondary bobbin 2 Component fixing plate 2a First component fixing plate 2b Second component fixing plate 3 Primary bobbin 4 Core 8 Solder part 11 Secondary winding terminal pin 12 Secondary winding 13 Square column 14 Rib 21 Component Polygonal columnar projecting ribs on fixing plate 22 Solder holding portion on component fixing plate 23 Through-hole provided in solder holding portion 24 Notch on part of cylindrical outer wall of solder holding portion on component fixing plate 25 Solder holding Slope 26a First rib 26b Second rib 27 Rib 31 Primary winding Dn1 nth layer first diode Dn1a nth layer first diode Anode-side lead wire Dn2 nth layer second diode Dn2a nth layer second diode cathode side lead wire Cn nth layer capacitor Cna nth layer capacitor lead wire R1 high voltage It is connected to the resistor R2 high-voltage capacitor connected in series to the force series resistance

Claims (6)

A core is arranged in the center, and the primary winding is wound around a primary bobbin arranged in a cylindrical shape with the core as a magnetic core, and the secondary winding is concentric with the primary winding and a cylindrical secondary bobbin The layers are divided into a plurality of layers, and the layers of each layer are insulated by an insulator so that the phase of the voltage generated in each layer is the same, and each layer of the secondary winding is at the start. The anode side of the first diode is connected, a capacitor is connected in series with the end of the secondary winding, and the other end of the capacitor is connected to the cathode side of the first diode and the anode side of the second diode. The cathode side of the second diode is connected to the beginning of the next layer, and the first diode, the second diode, and the capacitor are arranged in parallel with the center line of the cylinder of the secondary bobbin. One or more A flyback transformer arranged on a product fixing plate, wherein the secondary bobbin and the component fixing plate are filled with an insulating material by the primary bobbin and the case, and the component fixing plate includes the capacitor A solder holding portion surrounded by a hollow cylinder is provided at a portion connecting one end of the first diode to the cathode side of the first diode and the anode side of the second diode, and a lead wire can be inserted into the solder holding portion. Flyback transformer characterized by having a through hole. The flyback transformer according to claim 1, wherein only the lead wire of the capacitor is inserted into the through hole. 2. The flyback transformer according to claim 1, wherein a lead wire of the capacitor, a lead wire of the first diode, and a lead wire of the second diode are inserted into the through hole. 2. The flyback transformer according to claim 1, wherein three cutouts are provided in a part of the outer wall of the cylindrical portion of the solder holding portion, and the three cutouts have different heights. 2. The flyback transformer according to claim 1, wherein a slope is provided on an outer wall of the cylinder of the solder holding portion toward an open surface of the cylinder. 2. The flyback transformer according to claim 1, comprising a first component fixing plate and a second component fixing plate arranged at an angle of 90 degrees, and a polygonal columnar projecting rib provided on the component fixing plate and a secondary. It has a polygonal columnar hole provided on the bobbin, and is inserted into a prism with one side open, or the tip of the rectangular column provided on the component fixing plate is triangular, and one side of the triangle is taken from the square column The component-fixing plate and the above-mentioned plate are formed by making a rib projecting in one direction and a tip of a quadrangular column provided on the secondary bobbin into a triangular shape, and engaging one side of the triangle in one direction from the quadrangular column. A secondary bobbin is fixed, the first component fixing plate has a first protruding rib having a trapezoidal shape at the tip of a quadrangular column, and a trapezoidal base extending in two directions from the quadrangular column, The component fixing plate is triangular at the tip of the square pole And has two second projecting ribs with one side of the triangle projecting in one direction from the quadrangular prism, and a triangular shape projecting from the trapezoidal base of the first projecting rib and the projecting rib of the second projecting rib A flyback transformer characterized in that the first component fixing plate and the second component fixing plate are fixed by meshing one side portion.

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