JP2010147039A - Switching power supply device, switching power supply system, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact switching power supply device with high reliability while surely securing electric insulation between a lead of an electronic component and a plate, to provide a switching power supply system, and to provide an electronic apparatus. <P>SOLUTION: The switching power supply device is characterized in including a mounting structure having a whole surface spacer preventing an insulating sheet from being damaged or a through hole from being formed when a printed substrate bends owing to the mass of the electronic components or external stress during manufacture. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a switching power supply device, a power supply system using the switching power supply device, and an electronic device using the switching power supply device.

  Electronic devices generally have a built-in switching power supply device. A general switching power supply device includes an electronic component, a printed board, and a sheet metal, and the electronic component is mounted on the printed board and fixed to the sheet metal. A mounting structure is generally used in which an insulating sheet is attached between the lead of the electronic component and the sheet metal in order to prevent contact between the lead of the electronic component and the sheet metal.

  Specifically, the printed circuit board is fixed with fixing brackets and screws, such as the insulation distance item in the technical information “Request for Handling Single Board Products” published on the website of Cosel, Inc. When the distance between the lead and the sheet metal is insufficient, it is common to insert an insulating sheet between the printed board and the sheet metal.

  FIG. 6 shows an example of a switching power supply device using the prior art. In the switching power supply device of FIG. 6, a resistor 506, a capacitor 507, a coil 508, a switch element 509, and a logic element 510 are inserted into a printed board 502, and fixed and electrically connected by soldering. 503a, a fixing metal fitting 503b, a screw 505a, and a screw 505b are used to fix to a sheet metal 511, and an insulating sheet 504 is used between the printed board 502 and the sheet metal 511.

  Next, the components and mounting structure of the switching power supply device of FIG. 6 will be described. The resistor 506, the capacitor 507, the coil 508, the switch element 509, and the logic element 510 are electronic components used in an electronic circuit for realizing the electrical function of the switching power supply device, and are inserted into the through holes of the printed circuit board 502. . The printed circuit board 502 has a through hole corresponding to the lead of the electronic component, the lead of the electronic component is inserted into the through hole, and the lead of the electronic component and the printed circuit board 502 are soldered. Realize the electrical connection between. The screws 505a and 505b, the fixing bracket 503a, and the fixing bracket 503b are used to fix the printed board 502 to the sheet metal 511. The insulating sheet 504 is affixed to the sheet metal 511 and is used to maintain electrical insulation between the lead of the electronic component, which is a live part, and the sheet metal 511, and is necessary not to impair the electrical function of the switching power supply device. . The sheet metal 511 is used for suppressing discharge of electromagnetic waves generated from the switching power supply device to the outside, preventing contact with the live parts, and ensuring mechanical strength.

Technical information published on the website of Cosel Co., Ltd. “Request for handling single substrate products”

  In the switching power supply using the prior art shown in FIG. 6, since the distance between the lead of the electronic component and the insulating sheet is short, the insulating sheet is damaged by the lead of the electronic component, and the insulation function is reduced. When the lead of the electronic component penetrates the insulating sheet and comes into contact with the sheet metal, the electrical function of the switching power supply device may be impaired. Further, when the distance between the lead of the electronic component and the insulating sheet is increased, the switching power supply device is increased in size.

  As an example, a switching power supply device built in an electronic device of 1U size (height: 44.4 mm) typified by a server device is assumed.

  In order to incorporate a switching power supply device into a 1U size electronic device, the height of the switching power supply device needs to be 40 mm or less in consideration of the sheet metal thickness of the electronic device, the manufacturing error of the switching power supply device, and the mounting margin. The electronic parts of the switching device require high-profile parts typified by a high voltage capacitor, and the component height of a high voltage capacitor is generally 30 mm or more. In general, the thickness of the printed circuit board 502 of the switching power supply device built in the 1U size electronic device is 1.6 mm, the thickness of the sheet metal 511 is 1 mm, and the height of the fixing bracket 503a and the fixing bracket 503b is 3 mm. , Resistor 506, capacitor 507, coil 508, switch element 509, and logic element 510 lead of the electronic component leads from the printed circuit board 502 is 2.5 mm in order to ensure an electrical insulation function in accordance with safety standards The thickness of the insulating sheet 504 is 0.4 mm. Therefore, the distance between the lead of the electronic component and the insulating sheet 504 is obtained by subtracting the length of the lead of the electronic component from the substrate and the thickness of the insulating sheet 504 from the height of the fixing bracket 503a and the fixing bracket 503b. The distance becomes 3 mm−2.5 mm−0.4 mm = 0.1 mm, and only a very small distance can be secured.

  Therefore, when the printed circuit board is bent due to the mass of the electronic component and external stress, the lead of the electronic component comes into contact with the insulating sheet 504, and the electrical property of the insulating sheet 504 due to the generation of scratches on the insulating sheet 503. When the electronic component lead passes through the insulating sheet 504, the electronic component lead comes into contact with the sheet metal 511, and the electrical function of the switching power supply device is impaired.

  Further, in order to solve the above problem, when the height of the fixing metal fitting 503a and the fixing metal fitting 503b is increased and the distance between the lead of the electronic component and the insulating sheet 504 is increased, the height of the switching power supply is increased. Becomes higher and larger. For example, if the fixing metal fitting 503a and the fixing metal fitting 503b are 10 mm, the height of the switching power supply device is 1 mm + 10 mm + 1.6 mm + 30 mm + 1 mm = 43.6 mm, and the switching power supply cannot be built in the 1U size electronic device.

  As described above, in order to reduce the size and reliability of switching power supplies, a mounting structure that prevents scratches and through-holes on the insulation sheet due to the leads of electronic components is required when the printed circuit board is bent. It is.

  In order to solve this problem, in the switching power supply device of the present invention, even when the distance between the lead of the electronic component and the insulating sheet is short, the lead of the electronic component is inserted between the printed board and the insulating sheet. In order to prevent scratches and through-holes on the insulation sheet when the printed circuit board is bent due to the mass of electronic components and external stress during manufacturing Features.

  By using the switching power supply device of the present invention, electrical insulation between the lead of the electronic component and the sheet metal can be reliably ensured, and a small and highly reliable switching power supply device, power supply system, and electronic device can be applied.

  Hereinafter, the present invention will be described based on embodiments of the drawings.

  FIG. 1 shows an example of a switching power supply apparatus according to a first embodiment of the present invention. In the switching power supply device of FIG. 1, a resistor 7, a capacitor 8, a coil 9, a switch element 10, and a logic element 11 are inserted into the printed circuit board 2, and fixed and electrically connected by soldering, and the printed circuit board 2 is connected to the sheet metal 11. This is a mounting structure in which the screws 5 a and 5 b are used for fixing, the insulating sheet 4 is attached to the sheet metal 11, and the entire spacer 20 is used between the printed board 2 and the sheet metal 11.

  Next, components and a mounting structure of the switching power supply device of FIG. 1 will be described.

  The resistor 6, the capacitor 7, the coil 8, the switch element 9, and the logic element 10 are electronic components that are used in an electronic circuit for realizing the electrical function of the switching power supply device. The printed circuit board 2 has a through hole corresponding to the lead of the electronic component, the lead of the electronic component is inserted into the through hole, and the electronic component lead and the printed circuit board 2 are soldered to each other between the electronic components. Realize electrical connection. The screws 5 a and 5 b are used for fixing the printed board 2 to the sheet metal 11. The insulating sheet 4 is affixed to the sheet metal 11 and used to maintain electrical insulation between the lead of the electronic component, which is a live part, and the sheet metal 11, and is necessary not to impair the electrical function of the switching power supply device. The sheet metal 411 is used for suppressing discharge of electromagnetic waves generated from the switching power supply device to the outside, preventing contact with the live parts, and ensuring mechanical strength. Then, in order to prevent the insulating sheet from being scratched and through-holes from being generated by the leads of the electronic components, a full spacer 20 is inserted between the printed board 2 and the insulating sheet 4. The entire spacer 20 is fastened together with the printed circuit board 2 by screws 5a and 5b.

  FIG. 2 shows an example of the entire spacer 20 used in the first embodiment. The entire spacer 20 includes a through hole 106a and a through hole 106b into which the lead of the resistor 6 is inserted, a through hole 107 into which the lead of the capacitor 7 is inserted, a through hole 108a and a through hole into which the lead of the coil 8 is inserted. 108b, a through hole 109 into which the lead of the switch element 9 is inserted, a through hole 110a into which the lead of the logic element 10 is inserted, a through hole 110b, a through hole 105a into which the screw 5a is inserted, and a screw 5b are inserted. The through hole 105b has the same vertical and horizontal sizes as the printed circuit board 2, the thickness is equal to the distance between the printed circuit board 2 and the insulating sheet 4, and the material is an insulating material typified by glass epoxy and N66 nylon. . Moreover, the said through-hole can be easily created from the board | substrate manufacture data used at the time of manufacture of the printed circuit board 2, and the location where the said through-hole concentrates may be notched large.

  For example, if the length of the lead of the electronic component is 2 mm and the thickness of the entire spacer 20 is 2.5 mm, the distance between the lead of the electronic component and the insulating sheet 4 is 2.5 mm−. Although a very small distance of 2 mm = 0.5 mm is ensured, the entire spacer 20 has a function of securing a space with the insulating sheet 4 over the entire surface of the printed circuit board 2. When the printed circuit board 2 is deflected due to stress, it is possible to prevent the insulating sheet from being damaged and through holes. Further, since the entire surface spacer 20 replaces the fixing bracket 503a and the fixing bracket 503b of FIG. 6 which is the prior art, no fixing bracket is required. Furthermore, the thickness of the sheet metal 11 is 1 mm, the height of the capacitor 7 is 30 mm, the thickness of the printed circuit board 2 is 1.6 mm, the thickness of the insulating sheet 4 is 0.4 mm, and the thickness of the entire spacer 20 is 2.5 mm. Then, the height of the switching power supply device is 1 mm + 0.4 mm + 2.5 mm + 1.6 mm + 30 mm = 36.5 mm, and the switching power supply device can be downsized.

  As described above, by using the switching power supply device of the present invention, it is possible to reliably ensure electrical insulation, and to provide a small and highly reliable switching power supply device.

  The switching power supply according to the second embodiment of the present invention differs from the first embodiment only in the overall spacer. FIG. 3 shows an example of the entire spacer used in the switching power supply device according to the second embodiment. The full-surface spacer 220 includes a non-through hole 206a and a non-through hole 206b into which the lead of the resistor 6 is inserted, a non-through hole 207 into which the lead of the capacitor 7 is inserted, and a non-through hole into which the lead of the coil 8 is inserted. 208a, non-through hole 208b, non-through hole 209 into which the lead of the switch element 9 is inserted, non-through hole 210a, non-through hole 210b into which the lead of the logic element 10 is inserted, and through into which the screw 5a is inserted It has a through hole 205b into which a hole 205a and a screw 5b are inserted. It has the same vertical and horizontal size as the printed circuit board 2, the thickness is equal to the distance between the printed circuit board 2 and the insulating sheet 4, and the material is glass epoxy, N66 nylon. Use a representative insulating material. Therefore, the present embodiment is an embodiment using the entire surface spacer 220 which is not a through hole but a hole through which the lead of the electronic component of the entire surface spacer is inserted, compared to the first embodiment. The same effect as the first embodiment can be obtained. Furthermore, since the hole in which the lead of the electronic component of the whole surface spacer is inserted is not a through hole, this embodiment also has an insulating function between the lead of the electronic component and the sheet metal 11, and is the first embodiment. One insulating sheet 4 is not necessary.

  As described above, when the switching power supply device of the present invention is used, it is possible to reliably ensure electrical insulation, and to provide a small and highly reliable switching power supply device.

  FIG. 4 shows a third embodiment of the present invention, which is a power supply system having the mounting structure of the first or second embodiment. 4, 301 is a power supply system, 302 is a power supply system input, 303a, 303b, and 303c are power supply inputs, 304a, 304b, and 304c are the switching power supply devices 1 of FIG. 1, 305a, 305b, 305c is a power supply output, and 306 is a power supply system output. As shown in FIG. 4, in the power supply system 301 of this embodiment, the power supply input 303a, 303b, and 303c of the switching power supply devices 304a, 304b, and 304c are connected in parallel to the power supply system input 302, and the power supply of the switching power supply devices 304a, 304b, and 304c. The power supply system output 306 of the power supply system 301 is connected to the output 305a, 305b, 305c connected in parallel.

  As described above, since the power supply system 301 uses the switching power supply device according to the first embodiment or the second embodiment, electrical insulation can be reliably ensured similarly to the first embodiment or the second embodiment. It is possible to provide a highly reliable switching power supply system.

  FIG. 5 shows a fourth embodiment of the present invention, which is an electronic apparatus having the power supply system of the third embodiment. In FIG. 5, 401 is an electronic device, 402 is a power input, 403 is a power input, 404 is the switching power supply 1 of FIG. 1, 405 is a power output, and 406 is an electronic circuit. . As shown in FIG. 5, the electronic device 401 of the present embodiment has a switching power supply 404 connected to a power supply input 402 and an electronic circuit 406 connected to the switching power supply 404. Here, the electronic circuit 406 is, for example, an electronic arithmetic circuit, a memory circuit, an amplifier circuit, an oscillation circuit, a digital circuit such as a D / A converter or an A / D converter, or any electronic circuit regardless of an analog circuit.

  As described above, since the electronic device 401 uses the switching power supply device according to the first embodiment or the second embodiment, electrical insulation can be reliably ensured similarly to the first embodiment or the second embodiment, and the electronic device 401 can be reduced in size and size. It is possible to provide an electronic device having a reliable switching power supply system.

  The present invention relates to a switching power supply device, a power supply system, and an electronic device that can reliably ensure electrical insulation between a lead and a sheet metal of an electronic component, and provides a small, highly reliable switching power supply device, a power supply system, and an electronic device. can do. That is, it can be used for various power supply devices such as AC / DC power supply, DC / DC power supply, UPS power supply, various power supply systems, and various electronic devices.

1 is a first embodiment of the present invention. It is an example of the whole surface spacer used for the 1st Example of the present invention. It is an example of the whole surface spacer used for the 2nd Example of this invention. It is a 3rd Example of this invention. It is a 4th example of the present invention. It is an example of a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Switching power supply device, 2 ... Printed circuit board, 4 ... Insulating sheet, 5a, 5b ... Screw, 6 ... Resistor, 7 ... Capacitor, 8 ... Coil, 9 ... Switch element, 10 ... Logic element, 11 ... Sheet metal, 20 ... Full spacer, 105a, 105b ... Through hole for inserting screw, 106a, 106b ... Through hole for inserting resistor lead, 107 ... Through hole for inserting capacitor lead, 108a, 108b ... Lead of coil Through hole for inserting a switch element lead, 110a, 110b through hole for inserting a logic element lead, 205a, 205b ... through hole into which a screw is inserted, 206a, 206b ... Non-through hole into which resistor lead is inserted, 207... Non-through hole into which capacitor lead is inserted, 208 a, 208 b. 209... Non-through holes into which switch element leads are inserted, 210 a and 210 b. Non-through holes into which logic element leads are inserted, 220... Whole spacers, 301. Power system input, 303a, 303b, 303c ... Power input, 304a, 304b, 304c ... Switching power supply, 305a, 305b, 305c ... Power output, 306 ... Power system output, 401 ... Electronic device, 402 ... Power input, 403 ... Power input 404, switching power supply, 405 ... power output, 406 ... electronic circuit, 501 ... switching power supply, 502 ... printed circuit board, 503a, 503b ... fixing bracket, 504 ... insulating sheet, 505a, 505b ... screw, 506 ... resistor, 507 ... capacitor, 508 ... coil, 50 ... switch element, 510 ... logic elements, 511 ... sheet metal.

Claims (3)

  What is claimed is: 1. A switching power supply comprising a mounting structure having a spacer between a printed circuit board and a sheet metal so that leads of electronic components do not interfere with each other.   A power supply system comprising the switching power supply device according to claim 1.   An electronic device comprising the switching power supply device according to claim 1.

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