JP4681031B2 - Current balance circuit - Google Patents

Description

  The present invention relates to a current balance circuit, and more particularly to a current balance circuit that allows a current to flow through each electronic component in a balanced manner when connecting a plurality of electronic components such as a shunt resistor and a power supply module.

  As disclosed in Non-Patent Document 1, today, shunt resistors are widely used as resistors for current detection.

  By the way, when using this type of shunt resistor, for example, for a device that passes a large current, a plurality of shunt resistors are connected in parallel in the circuit, and the current is divided into each shunt resistor so that a small current flows. On the other hand, by connecting shunt resistors in parallel to reduce the number and using shunt resistors connected in parallel, multiple current values of multiple models are detected with the same resistance combination. A method has been proposed.

  As an example, for example, as shown in FIG. 25 and FIG. 26, a pair of left and right L-shaped mounting brackets 3 provided with four mounting holes 1 at equal intervals in the vertical direction are shown in FIG. Thus, a method has been proposed in which a plurality of shunt resistors 5 are screwed between the left and right mounting brackets 3 according to the detected current value, and the shunt resistors 5 are connected in parallel.

In FIG. 27, 7 is a printed circuit board, and 9 is a pattern on the printed circuit board 7 connected to the electrode 11 of the mounting bracket 3. FIG. 28 shows a schematic diagram in which two shunt resistors 5 are connected in parallel between the left and right mounting brackets 3 using the mounting bracket 3.
Basic knowledge of communication terms (shunt resistance) http://www.wdic.org/ Search date May 8, 2008

However, in the mounting method of the shunt resistor 5 using the mounting bracket 3, when the respective resistance values (Ω) from the input side to the output side are calculated as shown in FIG.
Upper shunt resistance (R1) = 5 + 10 + 20 + 10 + 5 = 50 (Ω)
Lower shunt resistance (R2) = 5 + 20 + 5 = 30 (Ω)
Thus, the lower shunt resistor (R2) has a resistance value (Ω) from the input side to the output side, in other words, the distance from the input side to the output side is shorter than the upper shunt resistor (R1).

  As a result, the current balance is lost and the current flowing through the lower shunt resistor (R2) increases (overload), so that the lower shunt resistor (R2) generates heat and both shunt resistors (R1) and (R2). It was pointed out that the design was not successful, such as a temperature difference.

  In addition, such a problem is not limited to the shunt resistor, and is also applicable, for example, when a plurality of power supply modules are incorporated in a circuit due to insufficient capacity. When the plurality of power supply modules are connected in parallel, the current balance is lost. There was a problem that a large load was applied to one power supply module.

  The present invention has been devised in view of such a situation, and when connecting a plurality of electronic components such as a shunt resistor and a power supply module using a pair of mounting brackets, a current flows through each of the electronic components in a balanced manner. An object of the present invention is to provide a current balance circuit.

In order to achieve such an object, a current balance circuit according to a first aspect of the present invention relates to a parallel connection of a plurality of identical electronic components using a pair of left and right mounting brackets. A plurality of mounting holes for mounting electronic components are formed at equal intervals in the vertical direction on either the front side or the back side of the bracket body formed in a letter shape, and mounting legs to the mounting plate are provided at the bottom of the bracket body. The mounting bracket of the same shape is formed, the mounting leg on the front side of one of the left and right mounting brackets is used as an electrode on the input side or the output side, and the mounting leg on the back side of the other mounting bracket is set on the output side or and an input side of the electrode, characterized in that the input side and the output side is also the resistance to the electronic components.
In the invention according to claim 2, when a plurality of identical electronic components are connected in parallel using a pair of left and right mounting brackets, the mounting brackets for mounting the electronic components are arranged in the vertical direction in the left and right mounting brackets. Side-mounting L-shaped mounting brackets that are formed at intervals and have mounting legs attached to the mounting plate at the bottom, and mounting for mounting electronic components on the back side of the bracket body formed in a substantially U-shape when viewed from the side A plurality of holes are formed at equal intervals in the vertical direction, and the mounting legs of the mounting bracket are formed by mounting brackets formed with mounting legs on the mounting plate at the lower part of the mounting body, and are formed in an L shape in side view. Is the input side or output side electrode, and the mounting leg on the other side of the mounting bracket is the output side or input side electrode, and the resistance values from the input side and the output side to each electronic component are the same. And

In parallel connecting a plurality of identical electronic components using a pair of left and right mounting brackets, by connecting a plurality of electronic components in parallel using a pair of mounting brackets according to claim 1 and claim 2, The resistance value from the output side to each electronic component is the same. As a result, it is possible to balance the current and allow the current to flow evenly through the electronic components.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 through 3 show a mounting bracket 13 used in the current balance circuit according to the first embodiment of claim 1, the present embodiment, the shunt resistor with a pair of left and right mounting brackets made of the mounting bracket 13 It is one Embodiment of the current balance circuit connected in parallel.

Mounting bracket 13, as shown, uniform wall thickness fitting body 14 in a side view substantially U-shaped in is formed on the front 15 side, which is formed in a strip shape of the metal fitting body 14, in Figures 4-7 Thus, a plurality of (four in this embodiment) identical shunt resistors 17 using a pair of left and right mounting brackets 13 are connected in parallel in a screw hole-shaped resistance mounting hole (hereinafter referred to as “mounting hole”) 19 in the vertical direction. formed with a plurality at equal intervals.

Then, three protrusions (attachment legs) 23 protruding downward are formed at equal intervals on the lower part of the front surface 15 side and the rear surface 21 side of the metal fitting body 14, respectively, and as shown in FIG. A mounting hole 27 is provided in the printed circuit board (mounting board) 25 in correspondence with 23.

  As described above, this embodiment uses a pair of left and right mounting brackets 13 to connect a plurality of the same type of shunt resistors 17 in parallel. When mounting to the printed circuit board 25, the pair of mounting brackets 13 are connected in parallel. The shunt resistor 17 is disposed corresponding to the length of the shunt resistor 17. For this reason, as shown in FIG. 8, three attachment holes 27 of the printed circuit board 25 are provided at four locations corresponding to the three projecting pieces 23 before and after the pair of attachment fittings 13.

  In addition, in FIG. 4, 29 indicates a screw for screwing the shunt resistor 17 to the mounting bracket 13.

Mounting bracket 13 used in the current balance circuit of the present embodiment is configured as this, a plurality of shunt resistors 17 with the mounting bracket 13 is mounted to the printed circuit board 25 as follows.

First, as shown in FIGS. 4 to 7, four shunt resistors 17 are connected in parallel to the front surface 15 side of the mounting bracket 13 between the pair of left and right mounting brackets 13 through the mounting holes 19.

  The number of shunt resistors 17 to be connected is increased or decreased according to the current value to be detected. In the present embodiment, four shunt resistors 17 are screwed between the left and right mounting brackets 13, but a small current flows. For example, the number of shunt resistors 17 connected in parallel may be reduced.

Then, as shown in FIGS. 8 and 9, after inserting the protrusions 23 at the bottom of both mounting brackets 13 into the mounting holes 27 of the printed circuit board 25, each protrusion 23 is soldered to the printed circuit board 25 and shunted. resistor 17 is a parallel connected pair of mounting bracket 13 is mounted on a printed board 25 on, but fixed, a mounting hole 27 front 15 side of the projecting piece 23 of the right mounting bracket 13 attaches as shown, the Patterns 31 and 33 are connected to the mounting holes 27 to which the protrusions 23 on the back surface 21 side of the left mounting bracket 13 located diagonally with the protrusions 23 are connected, and the protrusions 23 on the front surface 15 side of the right mounting bracket 13. Functions as the input side electrode A, and the projecting piece 23 on the rear surface 21 side of the left mounting bracket 13 functions as the output side electrode B.

Therefore, four of the shunt resistor 17, which is parallel connected with a pair of mounting brackets 13 as shown in FIG. 9, a shunt resistor 17 of the lowermost (first), the shunt resistance of the fourth of the uppermost 17 current inlets and outlets are arranged diagonally.

  The present embodiment is configured as described above, and FIG. 10 is a schematic view of the present embodiment in which four shunt resistors 17 are connected in parallel using the mounting bracket 13.

Then, as shown in FIG. 10, when the resistance value (Ω) of each shunt resistor 17 from the input side to the output side is calculated,
Uppermost (fourth) shunt resistor (R1) = 5 + 10 + 10 + 10 + 20 + 5 = 60 (Ω)
Third shunt resistor (R2) = 5 + 10 + 10 + 20 + 10 + 5 = 60 (Ω)
Second shunt resistor (R3) = 5 + 10 + 20 + 10 + 10 + 5 = 60 (Ω)
Lowermost (first) shunt resistor (R4) = 5 + 20 + 10 + 10 + 10 + 5 = 60 (Ω)
By arranging the current inlet and outlet of the lowermost shunt resistor 17 and the uppermost shunt resistor 17 diagonally, the resistance value (Ω) from the input side and the output side to each shunt resistor 17, in other words, The distance is equal.

  For this reason, the current input from the input side electrode A through the pattern 31 passes through the mounting bracket 13 and is divided into four shunt resistors 17 to be output to the output side electrode B. At this time, the current of the shunt resistor 17 The combined impedances of both poles are substantially equal, and the currents flowing through the respective shunt resistors 17 are equal.

In this way, when the plurality of shunt resistors 17 are connected in parallel, the pair of left and right mounting brackets 13 is used, and the protruding piece 23 on the front surface 15 side of the right mounting bracket 13 functions as the input side electrode A, so that the left mounting bracket 13, the projecting piece 23 on the back surface 21 side functions as the output-side electrode B, whereby the current inlet and the outlet of the lowermost shunt resistor 17 and the uppermost shunt resistor 17 are arranged diagonally. Ri Do and current can flow uniformly into each shunt resistor 17 is balanced, gone the temperature difference on each shunt resistor 17 occurs, the degree of freedom in design than conventional is dramatically improved benefits Have

  As described above, in the present embodiment, four shunt resistors 17 are connected in parallel between the left and right mounting brackets 13. However, when the shunt resistors 17 are connected in parallel using the mounting bracket 13, a large current is applied. For the current to be passed, four shunt resistors 17 may be connected in parallel as in the present embodiment, and the current may be shunted to each shunt resistor 17. What is necessary is just to use a parallel connection between the left and right mounting brackets 13 by reducing the number.

Thus, even in this case, the resistance values (Ω) from the input side and the output side to each shunt resistor 17 are equal, and the current can be balanced to allow current to flow evenly through each shunt resistor 17. It becomes.
In the above-described embodiment, the projection piece 23 on the front surface 15 side of the right mounting bracket 13 functions as the input side electrode A, and the projection piece 23 on the rear surface 21 side of the left mounting bracket 13 functions as the output side electrode B. However, the protruding piece 23 on the front surface 15 side of the right mounting bracket 13 may function as an output electrode, and the protruding piece 23 on the rear surface 21 side of the left mounting bracket 13 may function as an input electrode. It is.

11 to 16 show a mounting bracket used in the current balance circuit according to the second embodiment of the first aspect. As shown in the drawing, the mounting bracket 35 has a uniform wall thickness and a generally U-shaped bracket body 37. There is formed, the front 39 side and a back 41 which is formed in a strip shape of the fitting body 37 is parallel shifting the position in the lateral direction.

As shown in FIGS. 11 and 17 to 19, a plurality of (four in this embodiment) shunt resistors 17 are connected in parallel to each other on the back surface 41 side of the bracket body 37 using a pair of left and right mounting brackets 35. Mounting holes 19 are formed at equal intervals in the vertical direction.

As shown in FIGS. 11, 13, 15, and 16, a mounting flange (mounting leg) 43 that is bent forward in an L-shaped cross section is formed on the lower portion of the front surface 39 side of the metal fitting body 37. , the lower portion of the back side 41, similar to the mounting flange 43, bent into an L-shaped cross section forward, the mounting flange (attachment leg) 45 is provided whose tip protrudes to the same position as the mounting flange 43 Yes.

Then, the two mounting flanges 43 and 45 respectively, the screw holes 47 are formed at the same position on the front end side, also, the screw insertion holes 49 at the rear of the screw hole 47 is formed at the same position.

On the other hand, as shown in FIGS. 20 and 21, the bake plate (mounting plate) 51 for fixing the pair of left and right mounting brackets 35 has two screws corresponding to the screw insertion holes 49 of both mounting brackets 35. A hole 53 is formed, and one screw insertion hole 55 is provided corresponding to each of the screw holes 47 of the mounting flanges 43 and 45 located on the outside of the both mounting brackets 43.

Mounting bracket 35 used in this embodiment is constituted as this, a plurality of shunt resistors 17 with the mounting bracket 35 is attached to the bake plate 51 as follows.

First, as shown in FIGS. 17 to 19, four shunt resistors 17 are connected in parallel to the mounting holes 19 between the mounting brackets 35 using the pair of left and right mounting brackets 35.

  As described above, the number of shunt resistors 17 to be connected is increased or decreased according to the current value to be detected. In this embodiment, four shunt resistors 17 are connected in parallel between the left and right mounting brackets 35. The number of shunt resistors 17 connected in parallel may be reduced for those through which a small current flows.

  Then, as shown in FIGS. 21 and 22, screws 57 are screwed into the screw insertion holes 49 of the mounting flanges 43 and 45 of the mounting brackets 35 and the screw holes 53 of the bake plate 51 so that the four shunt resistors 17 are parallel. The pair of connected left and right mounting brackets 35 are mounted and fixed to the bake plate 51.

  Next, using the crimp terminal 59 as shown in the drawing, the screw holes 47 positioned outside the mounting flanges 43 and 45 of the left and right resistance mounting brackets 35 and the screw insertion holes 55 provided corresponding thereto are screwed. 61 is screwed to connect the wire 63 to the mounting flanges 43 and 45, the mounting flange 43 on the front 39 side of the right mounting bracket 35 functions as the input side electrode A, and the mounting on the back 41 side of the left mounting bracket 35 is performed. The flange 45 is caused to function as the output side electrode B.

Thus, the pair of left and right mounting brackets 35 in which the four shunt resistors 17 are connected in parallel is fixed to the bake plate 51, and the mounting flange 43 of the right mounting bracket 35 functions as the input side electrode A. When the functioning of the attachment flange 45 of the left mounting member 35 as an output side electrode B, as in the embodiment, the shunt resistor 17 of the uppermost stage (first), the lowermost fourth current shunt resistor 17 The entrance and the exit will be arranged diagonally.

  Therefore, the resistance values from the input side and output side to each shunt resistor 17, in other words, the distances from the input side and output side to each shunt resistor 17 are equal, and the currents flowing through the respective shunt resistors 17 are equal.

Thus, in this embodiment, the shunt resistor 17 is connected in parallel using the pair of left and right mounting brackets 35, and the mounting flange 43 on the front side of the right mounting bracket 35 functions as the input side electrode A. It is to function the back side of the mounting flange 45 of the left mounting member 35 as an output-side electrode B, the current of the uppermost (first) of the shunt resistor 17 and the lowermost fourth shunt resistor 17 inlet and outlet Are arranged diagonally. Also in this embodiment, the resistance values from the input side and the output side to each shunt resistor 17 are the same. Can be made to flow evenly, and there is no temperature difference in each shunt resistor 17, which has the advantage that the degree of freedom of design is drastically improved as compared with the prior art.

  Since the mounting bracket 35 bends the mounting flanges 43 and 45 forward to enable screwing work from the front, the mounting bracket 35 has an advantage in workability compared to the mounting bracket 13 of FIG.

  Furthermore, in the present embodiment, since one screw insertion hole 55 is provided on the bake plate 51 in correspondence with the screw holes 47 of the mounting flanges 43 and 45 located on the outer sides of both the left and right mounting brackets 43, Thus, there is an advantage that the wire 63 is not connected to the screw holes 47 of the mounting flanges 43 and 45 located inside the left and right mounting brackets 43.

This embodiment also has been parallel connection of four of the shunt resistor 17 between the left and right mounting brackets 35, upon parallel connection of the shunt resistor 17 with the mounting bracket 35, against which a large current As in the present embodiment, four shunt resistors 17 may be connected in parallel and the current may be shunted to each shunt resistor 17. However, for a device in which a small amount of current flows, the number of shunt resistors 17 is reduced and left and right. A parallel connection may be used between the mounting brackets 35.

Thus, even in this case, the resistance values from the input side and the output side to each shunt resistor 17 are equal, and a current balance can be achieved to allow current to flow evenly through each shunt resistor 17.
Of course, the mounting flange 43 on the front side of the right mounting bracket 35 may function as an output side electrode, and the mounting flange 45 on the back side of the left mounting bracket 35 may function as an input side electrode.

23 and 24 shows a current balance circuit according to an embodiment of the second aspect, the present embodiment is substantially the same shape of the mounting member 35-1 of relative long in the mounting bracket 35, the vertical direction Using the mounting bracket 65 having an L-shaped cross section in which four mounting holes 19 are provided at equal intervals, like the shunt resistor 17, a plurality (four in this embodiment) of power supply modules 67 that are resistors are baked. A parallel connection is made on the plate 51.
The reason why the mounting bracket 35-1 is made longer than that of the mounting bracket 35 is that the resistance value of the mounting bracket 35-1 is changed according to the internal resistance of the power supply module 67 to be connected.
A mounting flange (mounting leg) 69 of the mounting bracket 65 has a screw hole 47 for screwing the crimp terminal 59 and a screw insertion hole 49 for a screw 57 for fixing the mounting bracket 65 to the bake plate 51, respectively. It is provided at the same position as the screw hole 47 and the screw insertion hole 49 on the side. The bake plate 51 is also provided with screw insertion holes and screw holes corresponding to the screw holes 47 and screw insertion holes 49 provided in the mounting flanges 43, 45, and 69.

Thus, the four power supply modules 67 are attached to the bake plate 51 as follows using the mounting brackets 35 -1 and 65.

First, as shown in FIGS. 23 and 24, the same electrode 71 of the four power supply modules 67 is screwed into the mounting hole 19 of the mounting bracket 65 with the screw 29, and the other same electrode of the power supply module 67. 73, respectively, screwed with screws 29 to the mounting holes 19 of the mounting bracket 35 -1, to parallel connection of four power modules 67.

Then, the screw insertion holes 49 of the mounting flange 43 and 45 of the mounting bracket 35 -1, a screw 57 inserted into the screw insertion holes 49 of the mounting flange 69 of the mounting member 65 is screwed into the screw hole of the bake plate 51, four The power supply module 67 is mounted and fixed to the bake plate 51 with a pair of mounting brackets 35 -1 and 65 connected in parallel.

Then, the crimp terminal 59 as shown, the mounting flange 43 side of the screw hole 47 of the mounting bracket 35 -1, screwed into the screw hole 47 of the mounting flange 69 of the mounting bracket 65, the mounting flange 43 side The input side electrode A is caused to function, and the mounting flange 69 side is caused to function as the output side electrode B.
The mounting flange 43 side may function as the output side electrode, and the mounting flange 69 side may function as the input side electrode.

And Thus, Such a four pair of mounting brackets 35 -1 the power module 67 and a parallel connection, securing the 6 5 to bake plate 51, an input-side electrode of the mounting flange 43 side of the mounting member 35 -1 to function as a, when caused to function mounting flange 69 side of the mounting member 65 as an output side electrode B, and the power module 67 of the uppermost stage (first), an inlet of the current of the power supply module 67 of the fourth lowermost An exit will be arrange | positioned diagonally.

  For this reason, as in the above-described embodiments, the resistance values from the input side and output side to each power supply module 67, in other words, the distances from the input side and output side to each power supply module 67 become equal, and each power supply The currents flowing through module 67 are equal.

As described above, in the present embodiment, the power supply module 67 is connected in parallel using the pair of mounting brackets 35 -1 and 67, and the mounting flange 43 side of the mounting bracket 35 -1 functions as the input side electrode A. by to function mounting flange 69 side of the bracket 65 as an output side electrode B, and the power module 67 of the uppermost stage (first), the inlet and outlet diagonal current of the power supply module 67 of the fourth lowermost is arranged, as a result, also in this embodiment, the input side and the resistance value from the output side to the power supply modules 67 (distance) Ri is Na equal, heavy load on one of the power modules 67 0.00 current balance It was possible to solve the problem that it took.

It is a front view of a mounting bracket used in the current balance circuit according to the first embodiment of claim 1. It is a side view of a mounting bracket. It is a rear view of a mounting bracket. It is a front view of the current balance circuit which concerns on one Embodiment of Claim 1. It is a side view of a current balance circuit. It is a rear view of a current balance circuit. It is a top view of a current balance circuit. It is explanatory drawing of the attachment method of an attachment metal fitting. It is a perspective view of a current balance circuit. It is explanatory drawing of a current balance circuit. It is a perspective view of the mounting bracket used for the current balance circuit which concerns on 2nd embodiment of Claim 1. It is a front view of a mounting bracket. It is a top view of a mounting bracket. It is a rear view of a mounting bracket. It is a side view of a mounting bracket. It is a side view of a mounting bracket. It is a front view of the current balance circuit which concerns on 2nd embodiment of Claim 1. It is a top view of a current balance circuit. It is a side view of a current balance circuit. It is a principal part top view of a bake board. It is a top view of a current balance circuit. It is a perspective view of a current balance circuit. It is a perspective view of the current balance circuit which concerns on one Embodiment of Claim 2 . It is a top view of a current balance circuit. It is a front view of the conventional mounting bracket. It is a side view of a mounting bracket. It is explanatory drawing of the attachment method of the conventional shunt resistance using an attachment metal fitting. It is the schematic which connected two shunt resistors in parallel between a pair of mounting brackets using the mounting bracket.

Explanation of symbols

13, 35, 65 Mounting bracket 14, 37 Mounting bracket body 17 Shunt resistor 19, 27 Mounting hole 25 Printed circuit board 31, 33 Pattern 43, 45, 69 Mounting flange 47, 53 Screw hole 49, 55 Screw insertion hole 67 Power supply module

Claims (2)

When connecting multiple identical electronic components in parallel using a pair of left and right mounting brackets,
A plurality of mounting holes for mounting electronic components are formed at equal intervals in the vertical direction on either the front side or the back side of the bracket body formed in a substantially U shape in side view, the pair of left and right mounting brackets, Consists of mounting brackets of the same shape with mounting legs attached to the mounting plate at the bottom of the bracket body,
The mounting leg on the front side of one of the mounting bracket of the left and right as the input or output side of the electrode, and the other of said mounting bracket on the rear side output side or the input side of the electrode attachment leg, the input and output A current balance circuit characterized by having the same resistance value from the side to each electronic component. When connecting multiple identical electronic components in parallel using a pair of left and right mounting brackets,
A pair of left and right mounting brackets, a plurality of mounting holes for mounting electronic components are formed at equal intervals in the vertical direction, and a mounting bracket having an L shape in side view in which mounting legs to the mounting plate are formed at the bottom,
A plurality of mounting holes for mounting electronic components are formed at equal intervals in the vertical direction on the back side of the metal fitting body formed in a substantially U shape in side view, and mounting legs to the mounting plate are formed at the bottom of the metal fitting body. It consists of a mounting bracket and
A mounting leg of the mounting bracket formed in an L shape in a side view is used as an input side or output side electrode, and a mounting leg on the front side of the other mounting bracket is used as an output side or input side electrode. A current balance circuit characterized by having the same resistance value from the side to each electronic component.

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