JP2011210962A - Power supply device for multilayer printed circuit board - Google Patents

Abstract

Provided is a multilayer printed wiring board power supply device that is electrically and mechanically reliable, has a simple structure, can have a high mounting density, and can supply a large current.
A power supply device that supplies power to a backboard (11) formed of a multilayer printed wiring board via a power cable (14), and has at least two through holes through which a fastening body penetrates the surface of the backboard (11). A mounting pad 12 provided with 121, and a power supply terminal 13 formed of a metal block and provided with a mounting hole 131 so as to overlap a through hole provided in the mounting pad. Attaching at least one of the power supply terminals 13 fixed to the mounting pad 12 via a fastening body 15 inserted from the lower surface of the backboard 11 and the end of the power cable 14 fixed to the upper surface of the backboard It is fixed to the power supply terminal 13 through the fastening body 16 inserted into the hole 131.
[Selection] Figure 1

Description

  The present invention relates to a multilayer printed wiring board power feeding device, and more particularly to improvement of reliability and mounting density.

  In general, multilayer printed wiring is widely used in electronic devices in order to increase the mounting density of electronic components and reduce the size of the device. FIGS. 12A and 12B are configuration explanatory views showing an example of such a conventional multilayer printed wiring board power supply device, where FIG. 12A is a perspective view and FIG. 12B is a partial sectional view thereof.

  A plurality of through-holes 2 are provided on the backboard 1 formed of the multilayer printed wiring board so as to electrically connect the power supply wiring patterns having a predetermined positive and negative potential respectively provided on the multilayer printed wiring board. It has been. In the example of FIG. 12, five power supply terminals 3 are arranged so that five through holes 2 face each other.

  The power supply terminal 3 is provided with a plurality of press-fit terminals 31 that are press-fitted and fixed to the plurality of through-holes 2 and a screw hole 32. The power terminal 3 is fixed by press-fitting the plurality of press-fit terminals 31 into predetermined through holes 2.

  The power terminal 3 press-fitted and fixed to the backboard 1 is overlapped with a round terminal 41 crimped to the end of the power cable 4, and screws 5 are screwed into the round terminal 41 and the screw holes 32 to be fastened and fixed.

  As a result, the current supplied from each power cable 4 is supplied to a load (not shown) through the power supply terminal 3 → the through hole 2 → the power supply pattern 6 in the inner layer of the backboard 1.

  By the way, in the case of a large electronic device, as the number of layers of the printed wiring board of the backboard 1 increases, it becomes difficult to solder a power connector or the like. The terminal 31 must be used.

  Patent Document 1 describes the configuration of a power supply terminal that supplies power to the backboard via a press-fit terminal.

International Publication No. 01/099237

  However, when the press-fit terminal 31 is used, a large current (about 10 A) cannot be passed due to the small number of through holes 2 and the reliability of the through holes 2 after press-fitting.

  Further, the power supply terminal 3 has a problem in strength because it is fixed to the backboard 1 via the press-fit terminal 31, and a thick power supply cable 4 cannot be connected.

  In addition, distributed power supply is desirable from the viewpoint of safety, but for this purpose, the number of power supply terminals must be increased, the space for other mounting parts is reduced, and the power cable 4 is closely packed to fix screws. A new problem of reduced workability occurs.

  That is, when concentrated power supply is performed in the backboard 1, when a load-side short accident occurs, current concentrates there, and smoke or fire may occur in the backboard 1 or the power supply terminal 3. Although the power supply has a safety device such as limiting the output when short-circuited, the power supply used for centralized power supply has a large output power, so the power at the safety protection operating point also increases, and an accident may occur. In order to prevent this, it is conceivable to widen the power supply pattern of the terminal 3 corresponding to the large current and the backboard 1, but the space for other mounting parts becomes narrow and the wiring area of the signal pattern is limited. become.

  The present invention pays attention to such conventional problems, and its purpose is to have high electrical and mechanical reliability, simple structure, high mounting density, and supply of a large current. An object of the present invention is to provide a multilayer printed wiring board power supply device that can be used.

The invention of claim 1 which achieves such a problem,
A multilayer printed wiring board power supply device that supplies power via a power cable to a backboard configured with a multilayer printed wiring board,
A mounting pad provided with at least two through-holes formed by wiring patterns having the same shape on the upper and lower surfaces and inner layers of the backboard, respectively,
A power supply terminal formed of a metal block having a high conductivity and penetrating in the vertical direction and provided with at least two mounting holes so as to overlap with a through hole provided in the mounting pad;
The power supply terminal is fixed to a mounting pad formed on the upper surface of the backboard via a fastening body inserted from at least one through hole of the mounting pad formed on the lower surface of the backboard,
An end of the power cable is fixed to the power terminal through a fastening body inserted into at least one mounting hole of the power terminal fixed to the upper surface of the backboard.

Invention of Claim 2 is the multilayer printed wiring board electric power feeder of Claim 1,
The mounting pads are electrically connected to each other through a plurality of through holes.

A third aspect of the present invention is the multilayer printed wiring board feeding device according to the first or second aspect,
The fastening body is a screw.

The invention of claim 4 is the multilayer printed wiring board power supply device according to claim 1 or 2,
The fastening body is a rivet.

  As a result, a relatively simple structure, high electrical and mechanical reliability, simple structure, high packaging density, and large current can be supplied.

It is a configuration explanatory view showing an embodiment of the present invention. 4 is a specific example of a mounting pad 12. FIG. 3 is a specific example of a power supply terminal 13. FIG. It is operation | movement explanatory drawing of the multilayer printed wiring board electric power feeder comprised as FIG. It is composition explanatory drawing which shows the other Example of this invention. It is composition explanatory drawing which shows the other Example of this invention. It is composition explanatory drawing which shows the other Example of this invention. It is composition explanatory drawing which shows the other Example of this invention. It is composition explanatory drawing which shows the other Example of this invention. It is composition explanatory drawing which shows the other Example of this invention. It is composition explanatory drawing which shows the other Example of this invention. It is composition explanatory drawing which shows an example of the conventional multilayer printed wiring board electric power feeder.

  Hereinafter, the present invention will be described with reference to the drawings. 1A and 1B are explanatory views showing a configuration of an embodiment of the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a partial sectional view thereof.

  In FIG. 1, mounting pads 12 each having a wiring pattern of the same shape (rectangular in the example of FIG. 1) are formed on the upper and lower surfaces and inner layers of a backboard 11 formed of a multilayer printed wiring board. These mounting pads 12 are formed with two through holes 121 through which screws 15 as fastening bodies pass.

  Each of the plurality of mounting pads 12 formed on the upper surface of the backboard 11 is provided with a positive or negative power supply terminal 13 via a mounting pad 12 formed on the lower surface of the backboard 11. As shown in FIG. Here, the height of the power supply terminal 13 is formed so that the plus side is lower than the minus side.

  A round terminal 141 crimped to the end of the power cable 14 is overlaid on a screw hole 131 opened on the upper surface of the power terminal 13 attached to the upper surface of the backboard 11 with screws. The screw 16 is screwed into the screw hole 131 and fixed. Here, the height of the power supply terminal 13 is formed so that the plus side is lower than the minus side. Therefore, the plus and minus side power cables 14 are arranged in an orderly manner due to the difference in height between the power supply terminals 13. Become.

  2A and 2B are specific examples of the mounting pad 12, where FIG. 2A shows the mounting pad 12 formed on the mounting surface of the screw 15, and FIG. 2B shows the mounting pad 12 formed on the mounting surface of the power supply terminal 13. Is shown. Each of these mounting pads 12 is formed as a flat surface, and as described above, the through hole 121 through which the screw 15 passes is formed, and a plurality of through holes 122 for electrically connecting both surfaces of the printed wiring board. Is formed. The mounting pad 12 formed on the mounting surface of the screw 15 is formed on the mounting surface of the power terminal 13 by removing the solder resist in a ring shape so that the conductor pattern is exposed only in the portion 123 where the head of the screw 15 contacts. Solder resist is removed from the mounted pad 12 so that the conductor pattern on the entire surface is exposed.

  FIG. 3 is a specific example of the power supply terminal 13. The power supply terminal 13 is formed of a metal block having high conductivity, and is provided with screw holes 131 as two attachment holes penetrating in the vertical direction. The upper and lower surfaces of the power supply terminal 13 are formed as flat surfaces.

  FIG. 4 is an operation explanatory diagram of the multilayer printed wiring board power supply apparatus configured as shown in FIG. A current supplied through the power cable 14 passes through a through hole 121 formed in the mounting pad 12 from the power terminal 13, passes through a power pattern 111 formed in the inner layer of the backboard 11, and is a load (not shown). To be supplied.

  According to such a configuration, since the power terminal 13 is provided with at least two screw holes 131 for mounting, the power terminal 13 is mounted on the backboard 11 by a simple screwing process by screwing of the screw 15. In addition, high fixing strength can be obtained, and the power supply terminal 13 does not rotate even when the power cable 14 is fastened and fixed with the screw 16.

  Further, by using the power supply terminals 13 having different heights, the mounting space on the surface of the backboard 11 can be used effectively.

  The block shape of the power supply terminal 13 is simple, and the processing of the power supply terminal 13 is a drilling and tapping process of at least two screw holes penetrating in the vertical direction, and high manufacturing efficiency is obtained.

  Furthermore, since the mounting pad 12 pattern in which a plurality of through holes 122 are formed is provided in all inner layers constituting the backboard 11, the reliability of the through holes 122 is increased, and a large current of about 100 A is also supplied. it can.

  FIG. 5 is an explanatory diagram showing the configuration of another embodiment of the present invention. Components common to those in FIG. In FIG. 5, since the power terminal 13 is provided with two screw holes 131 for screwing the end portion of the cable, one of the screw holes 131 is a round crimped to the end portion of the power cable 14. The terminal 141 is overlapped and screw 16 is screwed and tightened and fixedly connected. The other screw hole 131 is overlapped with a round terminal 171 crimped to the end of the voltage monitor cable 17 and screwed with the screw 16. Connect them together by tightening.

  Thus, by controlling the output voltage of the power supply based on the monitor voltage, the voltage drop due to the impedance of the power cable 14 can be compensated, and the voltage setting accuracy at the power terminal 13 can be increased.

  Instead of the voltage monitoring cable 17, a temperature sensor is connected to detect the rising temperature at the time of abnormality. For example, if the measured temperature exceeds a preset alarm level, the output of the power supply is controlled to stop. May be.

  FIG. 6 is an explanatory view of the configuration showing another embodiment of the present invention, and the same reference numerals are given to the portions common to FIG. In FIG. 6, two power supply terminals 13 are fixedly disposed in the vicinity of both left and right ends of the backboard 11. For example, one screw hole 131 of the power supply terminal 13 disposed on the right side is connected to the end of the power cable 14. The round terminal 141 crimped on the part is superposed and the screw 16 is screwed and fastened and fixedly connected. The other screw hole 131 is overlaid with the round terminal 181 crimped to one end of the power relay cable 18 and the screw 16 is joined. It is screwed and tightened and fixed. And the round terminal 182 crimped | bonded to the other end of the power supply relay cable 18 is piled up in one screw hole 131 of the power supply terminal 13 arrange | positioned on the left side, and the screw | thread 16 is screwed together, and it is clamped fixedly connected.

  By providing the power supply relay cable 18 in this way, the power supply pattern formed between the left and right ends of the backboard 11 becomes unnecessary, and these power supply pattern areas can be used effectively as other signal wiring pattern areas. Can do.

  FIG. 7 is a diagram for explaining the configuration of another embodiment of the present invention, and the same reference numerals are given to portions common to FIG. In FIG. 7, each of the mounting pads 12 is formed with four through holes 121, and each of the power supply terminals 13 is also provided with four screw holes 131 penetrating in the vertical direction. Then, the power terminal 13 is attached to the mounting pad 12 by superimposing these four through holes 121 and the screw holes 131 and inserting and screwing the screws 15 into the two inner through holes 121 and the screw holes 131, and the outer 2 The round terminals 141 crimped to the end portions of the power cable 14 are overlapped with the through holes 121 and the screw holes 131, and the screws 16 are screwed together to be fastened and fixed.

  Thus, by using the inner and outer through-holes 121 and screw holes 131 for the attachment of the power supply terminal 13 and the connection of the power supply cable 14, the screws 15 and 16 are screwed from both the upper and lower surfaces of the power supply terminal 13. Further, it is not necessary to adjust the height of the power terminal 13 and the length of the screws 15 and 16 to prevent the ends of the screws 15 and 16 from hitting, and the height of the power terminal 13 can be reduced.

  FIG. 8 is an explanatory view of the configuration showing another embodiment of the present invention, and the same reference numerals are given to the portions common to FIG. In FIG. 8, the ends of the screws 15 for fixing the power terminals 13 to the backboard 11 are formed so as to protrude from the power cable fixing surface of the power terminals 13, and the ends of the protruding screws 15 are connected to the power cables. A round terminal 141 that is crimped to the end of 14 is fitted and fixed with a nut 19.

  The configuration of FIG. 8 can also reduce the height of the power supply terminal 13.

  FIG. 9 is an explanatory diagram of the structure showing another embodiment of the present invention, and the same reference numerals are given to the portions common to FIG. In the embodiment of FIG. 9, the mounting pad 12 is formed by using one of two through holes 121 provided in the mounting pad 12 and two screw holes 131 provided in the power supply terminal 13 in the vertical direction. The power terminal 13 is attached, and the other terminal is used to fasten and fix the round terminal 141 crimped to the end of the power cable 14 by screwing the overlapping screws 16. The screw 16 has a length that protrudes from the lower surface of the backboard 11.

  Thereby, even if the screw 15 which fixes the power supply terminal 13 to the backboard 11 is one, the power supply terminal 13 does not rotate and the height of the power supply terminal 13 can be made low.

  FIG. 10 is an explanatory diagram showing the configuration of another embodiment of the present invention, which is an example in which the power supply terminal 13 of FIG. 9 is rotated 90 degrees clockwise.

  FIG. 11 is an explanatory view of the structure showing another embodiment of the present invention, and the same reference numerals are given to the portions common to FIG. In the embodiment of FIG. 11, the screw hole 131 of the power terminal 13 is just a through hole, and the rivet 20 having a diameter slightly smaller than the hole diameter is inserted as a fastening body. And after fitting the round terminal 141 crimped | bonded to the edge part of the power cable 14 to the edge part of the rivet 20 which protrudes from the power terminal 13, the both ends of the rivet 20 are caulked with the riveter 21, and are fixed.

  9 and 10, a configuration in which the portion for fixing the power supply terminal 13 to the backboard 11 is fixed with a rivet and the portion for fixing the power supply cable 14 to the power supply terminal 13 is screwed may be used. .

  As described above, according to the present invention, a multilayer print capable of supplying a large current with a relatively simple configuration, high electrical and mechanical reliability, simple structure, high mounting density, and the like. A wiring board power supply device can be realized.

11 Backboard (multilayer printed wiring board)
DESCRIPTION OF SYMBOLS 111 Power supply pattern 12 Mounting pad 121 Through-hole 122 Through-hole 123 Screw head contact part 13 Power supply terminal 131 Screw hole 14 Power supply cable 141 Round terminal 15, 16 Screw (fastened body)
17 Voltage monitoring cable 171 Round terminal 18 Power relay cable 181, 182 Round terminal 19 Nut 20 Rivet (fastened body)
21 Ribetta

Claims (4)

A multilayer printed wiring board power supply device that supplies power via a power cable to a backboard configured with a multilayer printed wiring board,
A mounting pad provided with at least two through-holes formed by wiring patterns having the same shape on the upper and lower surfaces and inner layers of the backboard, respectively,
A power supply terminal formed of a metal block having a high conductivity and penetrating in the vertical direction and provided with at least two mounting holes so as to overlap with a through hole provided in the mounting pad;
The power supply terminal is fixed to a mounting pad formed on the upper surface of the backboard via a fastening body inserted from at least one through hole of the mounting pad formed on the lower surface of the backboard,
Multi-layer printed wiring board feeding, characterized in that the end of the power cable is fixed to the power terminal via a fastening body inserted into at least one mounting hole of the power terminal fixed to the upper surface of the backboard apparatus.   The multilayer printed wiring board feeding device according to claim 1, wherein the mounting pads are electrically connected to each other through a plurality of through holes.   The multilayer printed wiring board feeding device according to claim 1, wherein the fastening body is a screw.   The multilayer printed wiring board power feeding device according to claim 1, wherein the fastening body is a rivet.

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