JP2016116366A - Electric power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a noise elimination filter to a terminal plate in a housing of an electric power unit at a position close to the outside of the housing.SOLUTION: A terminal block 2 is provided on the back 6 of a housing 4 in which a power circuit is arranged, and inward ends of terminal plates 20, 20 where the terminal block 2 penetrates to the inside and outside of the housing 4 are connected to substrates 40, 42 where the power circuit in the housing 4 is constituted. The terminal plates 20, 20 transmit even unnecessary signals together with output currents. A noise elimination filter is constituted on a substrate 44 arranged very closely opposite the terminal block 2 in the housing 4. The terminal plates 20, 20 penetrate the substrate 44, and the terminal plates 20, 20 are connected to predetermined positions on the substrate 44 through piece-shaped bodies 48, 48.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply apparatus, and more particularly, to a power supply apparatus including a filter that prevents an unnecessary signal from being output to the outside.

  Conventionally, for example, Patent Document 1 discloses that a commercial AC power supply is rectified and smoothed at an input side rectifying and smoothing unit, the rectified and smoothed output is increased in frequency by an inverter, and this high frequency output is transformed by a transformer, and then an output side rectifying and smoothing unit 1 shows a switching power supply that outputs a rectified and smoothed output. In this switching power supply, a noise filter for suppressing high frequency noise such as switching noise and rectification noise generated in an inverter is provided between the output side of the output side rectifying and smoothing unit and the output terminal.

JP 2011-139599 A

  For example, in a power supply device for electroplating, in order to output the output DC current to the outside, there are cases where two relatively large positive and negative terminal plates attached to a terminal block provided in the casing of the power supply device are used. In this case, one end of each of the positive and negative terminal plates protrudes outside the casing, and the other end of each of the two terminal plates is connected to the output side rectifying and smoothing unit via the noise filter circuit. However, in this configuration, the noise filter circuit and the output-side rectifying and smoothing unit are configured on the same printed circuit board, and there may be a relatively long distance between the terminal block and the printed circuit board. In this case, since the noise filter circuit is connected to the other end of the terminal board, the output DC current is transmitted through the terminal board over a relatively long distance even though the noise is suppressed by the corner noise filter. During this transmission, noise may be superimposed on the output DC current on the terminal board. In order to prevent this, for example, it is conceivable to increase the size of the printed circuit board so that the edge of the printed circuit board approaches the terminal block, but this increases the cost. Therefore, it is desirable that the noise filter is connected to the terminal board at a position close to one end side of the terminal board outside the casing.

  An object of this invention is to provide the power supply device which connected the noise removal filter to the terminal board in the position near the outer side of a housing | casing.

  The power supply device of one embodiment of the present invention includes a housing. This casing has a power supply circuit disposed therein. The power supply circuit can have, for example, a switching power supply, for example, an inverter, can output a direct current, or can output an alternating current. A terminal block is provided on one surface of the housing. A part of the terminal block enters the inside of the housing. A plurality of terminal plates are provided through the terminal block in and out of the housing. The inner end of the terminal board is connected to the output side of the power supply circuit in the housing. The terminal board transmits unnecessary signals along with the output current. A substrate is disposed in the housing in the immediate vicinity of the terminal block so as to face the terminal block. The unnecessary signal removing filter means is formed on the substrate. The plurality of terminal plates pass through the substrate, respectively, and the inner ends of the terminal plates are connected to predetermined positions of the power supply circuit in the casing. The plurality of terminal plates are connected to predetermined positions of the filter means on the substrate through connecting tools.

  In the power supply device configured as described above, since the terminal plate is connected to the power supply circuit through the substrate provided with the filter means in the housing, the substrate can be disposed at a position close to the terminal block. . Therefore, it is not necessary to forcibly provide the power supply circuit close to the terminal block. Moreover, since the filter means on the substrate arranged near the terminal block is provided in the vicinity of the terminal block and is connected to the terminal plate via a connector, noise is radiated from the terminal plate. Can be prevented.

  The connector may be a thin plate having one end connected to the predetermined position of the substrate. In this case, the other end of the thin plate-like connector is connected to the terminal plate.

  Since a thin plate-like connector is used, the contact operation of the connector to the terminal plate can be easily performed, and the connection of the other end of the connector to the substrate can be easily performed by soldering or the like.

  Furthermore, the other end of the thin plate-like connector whose one end is connected to the reference potential portion on the substrate can be connected to the housing. In this case, the reference potential of the filter circuit on the substrate can be set to the potential of the housing, and the connection work is performed by a thin plate-like connector, so that the connection work can be easily performed.

  In the above aspect, a part of the terminal block can protrude into the housing. In this case, the substrate is attached to the protruding portion. If comprised in this way, since a board | substrate can be attached to a terminal block, it is not necessary to provide the boss | hub etc. for attaching a board | substrate in a housing | casing, and manufacture of a housing | casing can be made easy.

  The removal filter means may have a capacitor. In this case, the plurality of terminal plates are two terminal plates, and the capacitor is located between the two terminal plates. If comprised in this way, since the noise radiated | emitted from the capacitor | condenser will flow in the opposite direction to two terminal boards and cancel each other, noise can be reduced.

  The power supply circuit may include a switching power supply, for example, an inverter. In this case, the high-frequency current from the inverter is converted into a direct current, and the direct current is output to the outside through the terminal plate. The removal filter means is a low-pass filter means for removing a high frequency signal caused by the switching power supply. If comprised in this way, it can suppress that the switching noise generate | occur | produced by a switching power supply is radiated | emitted outside.

  As described above, according to the present invention, it is possible to arrange unnecessary signal removal filter means at a position close to the terminal block.

It is the top view and right side view of the terminal block vicinity of the power supply device of one Embodiment of this invention. It is a right view before connecting a connector to a terminal board in the terminal block vicinity of FIG. It is the left view, front view, and bottom view of the printed circuit board used with the power supply device of FIG. FIG. 2 is a partially omitted rear view and plan view of the power supply device of FIG. 1. It is a front view, a left side view, a plan view, and a partially omitted rear view of the terminal block of the power supply device of FIG.

  A power supply device according to an embodiment of the present invention is, for example, a plating power supply device, an input-side rectifying / smoothing unit that converts AC power into DC power, and a switching power source that converts DC power from the input-side rectifying / smoothing unit into high-frequency power. Part, for example, an inverter, and an output-side rectifying and smoothing unit that converts high-frequency power from the inverter into DC power. As shown in FIG. 4A, the plating power supply device has a back surface 6 of a housing 4 made of a conductor, for example, a metal, and is used for an output terminal for outputting a direct current to the back surface 6. A terminal block 2 is provided. The terminal block 2 has a base 8 as shown in FIG. The base 8 is formed of a substantially rectangular plate, for example, a rectangular flat plate, and has an opposing main surface, for example, a front surface 10 and a back surface 12. Screw insertion holes 14 are formed at the four corners of the base portion 8 so as to penetrate the front surface 10 and the rear surface 12, and the base portion is attached to the rear surface 6 of the housing 4 using this. As shown in FIG. 4B, the pedestal 16 that protrudes toward the back surface 12 of the base 8 matches the hole formed in the back surface 6 of the housing 4 as shown in FIG. Is protruded into the housing 4 and attached so that the surface 10 side of the base 8 protrudes from the back surface 6 of the housing 4 to the outside.

  Two terminal holes 18 and 18 are formed so as to penetrate the front surface 10 and the rear surface 12 of the base 8. As shown in FIG. 4A, the terminal holes 18 and 18 are formed so as to be substantially located on one diagonal line of the base portion 8 with a space therebetween. These terminal holes 18, 18 are formed in a substantially rectangular shape, for example, a rectangular shape, and are arranged so that the long sides thereof are parallel to the long sides of the base 8.

  The metal terminal plates 20 for the positive output terminal and the negative output terminal that are the output terminals described above are inserted into the terminal holes 18 and 18. A terminal plate having the same shape is used for any of these positive and negative output terminals.

  However, according to the current capacity of the terminal board 20, for example, in this embodiment, among the four types having different thickness dimensions and width dimensions, one corresponding to the output power capacity of the plating power supply device is used. . For example, a terminal board having a thickness dimension t1, a width dimension W1, a terminal board having a thickness dimension t2 (t2> t1) and a width dimension W1, and a thickness dimension t3 (t3> t2), a width dimension. Is a terminal plate of W2 (W2> W1), a terminal plate having a thickness dimension of t4 (t4> t3) and a width dimension of W2. Although not shown, a nut is inserted in the middle of the terminal board 20. In any case, the thickness of the terminal board 20 is such a thickness that the terminal board 20 cannot be bent by hand.

  The selected one of these terminal boards 20 is inserted into the terminal holes 18 and 18. As shown in FIG. 4B, this insertion is performed so that the length direction of the terminal plate 20 is the direction connecting the front surface 10 and the back surface 12, that is, the front end of the terminal plate 20 is external to the inside of the housing 4. It is made to invade from. The terminal holes 18 and 18 need to be capable of being attached to any terminal board having a different thickness or width.

  Accordingly, as shown in FIG. 5A, the terminal hole 18 has a rectangular main portion 22 in which the interval between the long sides is t2 and the interval between the short sides is W2. From the center of one long side of the main portion 22, a rectangular extension portion 24 is formed on the outside thereof, the distance from the long side to the long side is t1, and the distance between the short sides is W1. . That is, one long side is extended outwardly in a step shape. Note that the extended portion 24 protrudes in opposite directions in the two terminal holes 18. Therefore, the selected one of the four types of terminal boards having different thicknesses and widths can be inserted into the terminal holes 18 and 18.

  On the surface 10 side, around the terminal holes 18, 18, a protection cylinder 26 having a substantially rectangular parallelepiped appearance is shown from the surface 10 side as shown in FIG. And protrudes from the surface 10 of the base 8 of the terminal block 2 to the outside of the housing 4.

  In order to fix the terminal plate 20 inserted through the terminal holes 18, 18, as shown in FIGS. 5B and 5D, the terminal holes 18 are disposed around the terminal holes 18, 18 on the back surface 12 side. , 18 so as to surround 18, projecting so as to enter the inside of the housing 4 from the back surface 12. FIG. 5D shows a state in which the terminal block 2 is viewed from the inside of the housing 4 in the back direction. As shown in FIG. 5D, the side wall 28a corresponding to the long side of the extension portion 24 of the fixed portion 28 partially protrudes outside the extension portion 24 as shown in FIG. As shown in b), a screw insertion hole 30 is formed, and a recess 34 for inserting a nut provided in the terminal plate 20 is formed in the side wall 28b facing the screw insertion hole 30. When the terminal plate 20 is inserted from the fixing portion 28 on the back surface 12 of the terminal block 2 and the nut of the terminal plate 20 is inserted into the recess 34, a part of the terminal plate 20 is pulled out of the housing 4 and a part thereof It will be in the state arrange | positioned in the housing | casing 4. FIG. Then, a screw (not shown) inserted through the screw insertion hole 30 is screwed into a nut inserted in the middle of the terminal plate 20, and the terminal plate 20 is fixed to the fixing portion 28. When a screw is screwed onto the nut, a force that rotates the nut (terminal plate 20) acts, but the edge on both sides in the width direction of the terminal plate 20 is used regardless of which type of terminal plate is used. Is prevented from rotating by abutting against the upper and lower short sides of the main portion 22 or the extended portion 24 of the terminal hole 18, thereby preventing the terminal plate 20 from rotating when screwed. Therefore, the nut does not rotate even if the terminal board nut is not pressed with a tool, so the screwdriver can be inserted from one direction and the screw can be turned to secure it. Space for pressing can be eliminated and assembly can be facilitated.

  Further, a cover 36 shown in FIG. 5A is fitted at a position near the terminal hole 18 in the protective cylinder 26 in order to prevent dust and the like from entering the housing 4 from the gap of the terminal hole 18. It is. The cover 36 has a shape corresponding to the inner peripheral surface of the protective cylinder 26. In addition, a terminal plate insertion hole 38 is formed in the cover 36, and the terminal plate is inserted through the insertion hole 38 and fitted into the protection 26. The position and size of the insertion hole 38 are formed so as to substantially match the thickness and width of the selected terminal plate 20 among the plurality of terminal plates 20 having different thicknesses and widths. However, if the difference in size is not so great even with different terminal plates 20, if a cover having elasticity is used, it can be deformed into the shape of the terminal plate 20 and the difference in size can be absorbed. It is also possible to prepare only one type of cover 36 with the position of the insertion hole 38 fixed.

  The distal ends of the terminal plates 20 and 20 are inserted into the housing 4 and then reach the vicinity of the substrates 40 and 42 in the housing 4 as shown in FIG. The terminal plates 20, 20 are connected at one end to the substrate 40 and the other terminal plate to the substrate 42 via L-shaped connectors 43, 43 screwed thereto. . These substrates 40, 42 constitute output side rectifying / smoothing parts, and their reference potential parts are connected to the housing 4. The terminal plates 20 and 20 are connected to the substrates 40 and 42 through the substrate 44 attached to the fixing portions 28 and 28. In addition, since the extended part 24 is formed in the center of one long side of the main part 22, the position where the terminal board is connected to the boards 40 and 42 regardless of which of the terminal boards 20 having different width dimensions is used. Will not change.

  A filter circuit to which the terminal plates 20 and 20 are connected is configured on the substrate 44. This filter circuit is for suppressing high-frequency switching noise generated by an inverter, for example, and is configured as a low-pass filter using a capacitor 45 (see FIG. 4B) and an inductor (not shown). Yes.

  As shown in FIG. 3A, the substrate 44 is formed in a plate shape having a substantially rectangular planar shape. A part of one long side of the substrate 44 is omitted and formed in a step shape. The substrate 44 is attached to the fixing portions 28, 28, faces the terminal block 2, and is positioned closest to the back surface 6 in the vicinity of the back surface 6. When the substrate 44 is attached to the fixing portions 28, 28, the rectangular through holes 46, 46 through which the terminal plates 20, 20 can insert the substrate 44 in the front and back directions have their long sides parallel to the long sides of the substrate 44. It is formed in the state. That is, it is formed so as to be substantially positioned on one diagonal line of the substrate 44 with an interval corresponding to the arrangement of the terminal plates 20 and 20. As shown in FIG. 4B, a low-pass filter capacitor 45 is disposed between the terminal boards 20 and 20.

  A connector for connecting a low-pass filter to the terminal plates 20 and 20 that have passed through the through holes 46 and 46, for example, thin conductive strips 48 and 48, as shown in FIG. It is provided along the long side in the vicinity of the long side located inside the through holes 46, 46. One end of each of the pieces 48 and 48 is soldered to a predetermined connection location of the low-pass filter of the substrate 44. Since the strips 48 are thin plates, they are small in rigidity and can be easily bent by a worker's hand. That is, the pieces 48 and 48 have elasticity.

  Further, in the vicinity of the long side formed in a step shape of the substrate 44, a connection tool for connecting a reference potential, for example, a thin conductive strip 50 is disposed. One end of the piece 50 is soldered to the reference potential portion of the substrate 44. Since the piece-like body 50 is also a thin plate, it has a small rigidity and can be easily bent by the hand of an operator, and has elasticity.

  As shown in FIG. 2, with the terminal block 2 attached to the back surface 6, the through holes 46 and 46 of the substrate 44 and the terminal holes 18 and 18 of the terminal block 2 are formed in the fixing portions 28 and 28 of the terminal block 2. Installed to match. The terminal plates 20, 20 are inserted into the terminal holes 18, 18 of the terminal block 2 and the through holes 44, 44 of the substrate 44, and the tips of the terminal plates 20, 20 are made to reach the vicinity of predetermined locations on the substrates 40, 42. Thereafter, the tips of the terminal plates 20, 20 are connected to predetermined locations of the substrates 40, 42 via the L-shaped connectors 43, 43. In this connected state, as shown in FIGS. 1 (a) and 1 (b), the strips 48, 48 are bent halfway and their tips are brought into contact with the middle of the terminal plates 20, 20 and are not shown. The strips 48, 48 are fixed to the terminal boards 20, 20 with screws or solder. The piece 50 is folded back halfway, passes through the stepped portion of the substrate 44, has a tip positioned on the back surface 6 side, and is screwed into a metal connection portion 52 formed integrally with the back surface 6 and directly connected thereto. Or fixed with solder.

  In this power supply device, the substrate 44 on which the low-pass filter is configured is attached to the fixing portions 28 and 28 of the terminal block 2 closest to the outside of the housing 4, and the tips of the terminal plates 20 and 20 are connected to the back surface. In order to connect to the boards 40 and 42 located at some distance from the board 6, through holes 46 and 46 are formed in the board 44, and the terminal plates 20 and 20 are passed through them. In addition, in order to connect the low pass filter on the substrate 44 attached to a position close to the back surface 6 of the housing 4 to the terminal plates 20, 20, one end of the thin plate-like pieces 48, 48 is connected to a predetermined portion of the substrate 44. The other ends are fixed to the terminal plates 20 and 20 by elastically deforming the pieces 48 and 48 in advance. Accordingly, the wiring distance can be shortened, the switching noise generated from the inverter and flowing on the terminal boards 20 and 20 can be surely suppressed, and the switching noise radiated to the outside of the housing 4 can be reliably prevented. Can be reduced. In addition, since the reference potential portion of the substrate 44 is connected to the attachment portion 52 directly connected to the housing 4 by the strip-like body 50, noise can be reduced. It can be made the same as the other substrates 40 and 42 in a position apart from this. In addition, since the capacitor 49, which is a component of the low-pass filter, is disposed between the terminal plates 20 and 20, unnecessary radiation from the capacitor 49 flows to the opposite side and can be suppressed. it can. Since the step portion is provided on one long side of the substrate 44 and the piece-like body 50 is provided in the vicinity of the step portion, the connection to the connection portion 52 of the back surface 6 can be easily performed in the shortest distance.

  In the above embodiment, since the low-pass filter is connected to the positive and negative output terminals, there are two insertion holes 18 formed in the base 8 of the terminal block 2, but for example, in the case of an electric device that outputs a three-phase alternating current, for example. Three terminal holes 18 are formed, and three terminal plates 20 are used. In that case, three through-holes 46 are also formed in the substrate 44, three pieces 48 are provided in the vicinity of each plate, and the configuration of the low-pass filter is also changed for three-phase alternating current. Further, in the above embodiment, only one extended portion 24 of the terminal hole 18 is provided, but a terminal plate selected from more than four types of terminal plates is formed by forming a plurality of extended portions. Can do. Further, the terminal block 2 can be configured exclusively for one type of terminal board 20, and for example, the extended portion 24 can be removed. In the above embodiment, the substrate 44 is fixed to the fixing portion 28. However, the present invention is not limited to this. For example, a plurality of bosses may be provided on the back surface 6 and the substrate 44 may be attached to these bosses. Also, the strips 48, 48 are screwed to the terminal plates 20, 20, but they can be connected by welding or at the tips of the strips 48, 48, 40 than in the width direction of the terminal plates 20, 20. It is also possible to provide a large rectangular enlarged portion, bring them into contact with the middle of the terminal plate 20, fold portions protruding from both edges in the width direction of the terminal plate, and bring them into contact with the terminal plates 20 and 20. In the above embodiment, the terminal board is provided on the back surface 6, but it may be provided on the side surface or the front surface. In this case, the substrate 44 is also provided at a position close to the side surface or the front surface.

  In the above embodiment, the terminal block 2 is used for the power supply output terminal of the power supply device for plating. However, the present invention is not limited to this, and the terminal block 2 can also be used as a power supply for other electrical equipment, for example, a welding machine.

2 Terminal block 4 Housing 20 Terminal board 44 Substrate 48 Strip (connector)

Claims (6)

A housing in which a power supply circuit is disposed;
A terminal block that is provided on one surface of the housing, and a part of which enters the interior of the housing;
A plurality of terminal plates that penetrate the terminal block into and out of the housing, the inner ends thereof are connected to the output side of the power supply circuit in the housing, and an unnecessary signal is transmitted together with the output current;
The unnecessary signal removing filter means configured on the substrate disposed in the housing in the immediate vicinity of the terminal block and facing the terminal block;
And the plurality of terminal boards are connected to predetermined positions on the substrate through connecting tools that respectively penetrate the substrate and are provided correspondingly.   2. The power supply device according to claim 1, wherein the connector has a thin plate shape in which one end is connected to the predetermined position of the substrate and the other end is connected to the terminal plate.   The power supply device according to claim 2, wherein the other end of the thin plate-like connector whose one end is connected to the reference potential portion on the substrate is connected to the housing. The power supply device according to claim 1, wherein a part of the terminal block protrudes into the housing, and the substrate is attached to the protruding portion.   2. The power supply device according to claim 1, wherein the removal filter means includes a capacitor, the plurality of terminal plates are two terminal plates, and the capacitor is located between the two terminal plates.   2. The power supply device according to claim 1, wherein the power supply circuit includes a switching power supply therein and outputs a direct current to the outside through the terminal plate, and the removal filter means outputs a high-frequency signal resulting from the switching power supply. A power supply device which is a low-pass filter means to be removed.

Images