JP5646242B2 - Circuit board equipment - Google Patents

Description

  The present invention relates to a circuit board device in which a charging circuit section and a discharging circuit section are mounted on a circuit board.

Power supply to the actuator tends to be performed using a rechargeable secondary battery for cost reduction.
A dedicated circuit board device is used for such charge / discharge control of the secondary battery. 2. Description of the Related Art Conventionally, a circuit board device is used in which a charging circuit unit that controls charging of a secondary battery and a discharging circuit unit that controls discharging of the secondary battery are mounted on the same circuit board. In many cases, on one side of a circuit board, an electronic component or an electrical component constituting a charging circuit unit, an electronic component or an electrical component constituting a discharging circuit unit are mounted, and a conductive path formed inside the circuit board is used. A structure in which a charging circuit unit or a discharging circuit unit is connected to a secondary battery, an operating device that forms an actuator, or an external power source is used. Thus, when the charging circuit unit is activated (discharge circuit unit: not activated), power is charged from the external power source to the secondary battery through the conductive path, and when the discharging circuit unit is activated (charging circuit unit: deactivated), two Electric power is discharged (supplied) from the secondary battery to the actuator through the conductive path.

By the way, the charging circuit section includes a mounting component that generates a large amount of heat. In particular, since the amount of heat generated by the mounted component is excessive, when the charging circuit unit is operated, the heat generated by the mounted component may thermally affect other mounted components and the circuit board.
Therefore, in order to protect against such heat damage, circuit board devices that perform charge / discharge control have conventionally provided heat sinks directly or indirectly to the mounted components that generate heat, and radiate the heat of the mounted components. Heat is released from the plate to the outside air. This heat dissipation structure is not only a circuit board that forms a conductive path on a circuit board, but also a circuit board in which a conductive path as disclosed in Patent Document 1 is formed not by the circuit board but by a bus bar outside the circuit board. It is used. For this reason, in Patent Document 1, a heat sink is provided exclusively for mounting component heat dissipation separately from the bus bar to dissipate the heat of the mounting component.

JP 2002-124313 A

  However, the heat dissipation structure in which the heat sink is separately provided on the circuit board or the mounting component as described above has a cost burden due to an increase in the number of components. Moreover, the installation of the dedicated heat sink not only increases the occupied area, but also requires measures to increase the gap between the mounted components, so the mounting density of the charging circuit section is impaired, and the circuit board device can be made more compact. It is easily damaged.

  Accordingly, an object of the present invention is to pay attention to the fact that the charging circuit unit and the discharging circuit unit do not operate simultaneously, and the heat of the charging circuit unit is radiated to the outside without using a dedicated heat sink. An object of the present invention is to provide a printed circuit board device.

In order to achieve the above object, the present invention provides a circuit in which a charging circuit section for charging a chargeable / dischargeable secondary battery and a discharging circuit section for discharging from the secondary battery are provided on one side. In order to utilize a structure having a board and a bus bar that is connected to the discharge circuit unit and guides a current discharged from the secondary battery to a predetermined position in accordance with the operation of the discharge circuit unit, the bus bar is provided at least on the other side of the circuit board. Installed in close contact with the other side where the charging circuit is located, and when the charging circuit is inactive, the heat generated by the operation of the charging circuit is passed through the circuit board. There was no heat dissipated from the bus bar.
In other words, using the fact that the charging circuit unit and the discharging circuit unit do not operate at the same time, use the bus bar of the discharging circuit unit in which no current flows when the charging circuit unit is inactive. Then, the charging circuit unit that causes excessive heat generation is cooled.

According to the second aspect of the present invention, a charging circuit portion is provided in the middle portion of the circuit board, and one terminal portion to which one end portion of the bus bar is attached is provided on one end side of the circuit board sandwiching the charging circuit portion. A discharge circuit portion is provided on the other end side of the circuit board opposite to the terminal portion, and the other end portion of the bus bar is attached to the other end side of the circuit board opposite to the charging circuit portion sandwiching the discharge circuit portion. A terminal portion is provided, and the bus bar is attached so as to be electrically connected to each terminal portion while being in close contact with at least the other side surface portion where the charging circuit portion is located.
Thereby, the full length of a bus-bar is defined long using the circuit board extended in one direction of the circuit board device and laid out compactly. In other words, the heat radiation area provided by the bus bar can be obtained by using the layout of the mounted components.

In addition to the above object, the invention of claim 3 further provides an insulating member having thermal conductivity between the other side surface of the circuit board and the bus bar so that various conductive parts exposed on the other side surface of the circuit board do not conduct with the bus bar. It was decided to intervene.
In addition to the above object, the invention of claim 4 further includes a soldering portion at one end so that the bus bar can be easily attached to the circuit board even if the circuit board is slightly warped. The bus bar is attached to the circuit board by having a structure having an engaging part at the end, the bus bar engaging part being locked to the circuit board, and the soldering part of the bus bar being soldered to the circuit board. did.

According to the first aspect of the present invention, when the charging circuit unit in which the discharging circuit unit is inoperative is in operation, the heat generated in the charging circuit unit is radiated to the outside using the bus bar of the discharging circuit unit through which no current flows. be able to.
Therefore, paying attention to the fact that the charging circuit section and the discharging circuit section do not operate simultaneously, the charging circuit section that causes excessive heat generation can be cooled without using a dedicated heat sink. Thereby, the number of parts can be suppressed and the cost spent on the circuit board device can be reduced. In addition, a charging circuit portion having a high mounting density can be realized, and the circuit board device can be made compact.

According to the invention of claim 2, the layout extending in one direction of the circuit board device can be used to increase the overall length of the bus bar and to increase the heat dissipation area of the bus bar. Can be cooled automatically.
According to the invention of claim 3, since various conductive portions exposed on the other side surface of the circuit board can be prevented from conducting with the bus bar, the heat of the charging circuit portion can be radiated from the bus bar while ensuring safety. .
According to the fourth aspect of the present invention, even if the circuit board is slightly warped, the bus bar can be easily assembled to the circuit board because the one side of the circuit board is locked by the locking structure.

The front view of the circuit board apparatus used as the principal part of one Embodiment of this invention. The rear view which similarly looked at the circuit board apparatus from the back. The perspective view which decomposed | disassembled some circuit board apparatuses similarly. The perspective view which similarly shows the fixing structure of the edge part of the one side of the bus-bar of a circuit board apparatus. The perspective view which shows the fixing structure of the edge part of the one side which the bus-bar of the circuit board apparatus similarly remains.

Hereinafter, the present invention will be described based on an embodiment shown in FIGS.
FIG. 1 is a front view of a circuit board device 1a that performs charge / discharge control of a secondary battery to which the present invention is applied, FIG. 2 is a rear view, and FIG. 3 is a partially exploded perspective view. 1 is a circuit board constituting the circuit board device 1a, 2 is a battery unit (illustrated by a one-dot chain line in FIG. 1) composed of a large number of chargeable / dischargeable secondary batteries assembled to the lower surface which is the other side of the circuit board 1 ).

  A discharge circuit unit 5 and a charging circuit unit 7 are provided on an upper surface which is one side surface of the circuit board 1. The discharge circuit unit 5 and the charging circuit unit 7 are connected to an input / output unit (not shown) of the battery unit 2. Among these, the discharge circuit unit 5 is configured by a circuit that performs discharge control of the battery unit 2. Mounting components 6 such as various electronic components and electric components constituting the circuit are mounted on the upper surface of the circuit board 1. The charging circuit unit 7 is configured by a circuit that controls charging of the battery unit 2. Mounting components 8 such as various electronic components and electric components constituting the circuit are mounted on the upper surface of the circuit board 1. In addition, since the discharge circuit part 5 and the charging circuit part 6 perform charging / discharging control with respect to the same battery unit 2, when the discharge circuit part 5 act | operates, the charging circuit part 7 does not act | operate (non-operation). On the contrary, when the charging circuit unit 7 is activated, the discharging circuit unit 5 is not activated (non-actuated), and both are not activated at the same time.

A bus bar 9 connected to the discharge circuit unit 5 is provided on the lower surface which is the other side surface of the circuit board 1. The bus bar 9 allows a current discharged from the battery unit 2 to be guided to one terminal portion 10 for discharging in accordance with the operation of the discharging circuit portion 5. The other terminal portion 11 paired with the terminal portion 10 is electrically connected to the discharge circuit portion 5 through a conductive path (not shown) formed in the circuit board 1 and uses the terminal portions 10 and 11. Power supply to actuators such as operating devices.
In addition, the circuit board 1 is provided with a charging terminal portion (not shown) and a conductive path (not shown) for conducting between the terminal portion and the charging circuit portion 7. Power is charged from the external power source to the battery unit 2 using the charging unit, the charging conductive path, and the charging circuit unit 7.

  Further, the circuit board device 1a has an elongated circuit board extending in one direction, here in the left-right direction, as shown in FIGS. 1 to 3, so as to have a compact structure extending in the left-right direction. In use, the circuit board 1 has a structure in which each part is laid out in series along the longitudinal direction. Specifically, the circuit board device 1a is provided with a charging circuit unit 7 at an intermediate part of the elongated circuit board 1, and an output part of the bus bar 9 on the right end side which is one end side of the circuit board 1 across the charging circuit part 7. Discharge-side terminal portion 10 is provided. A terminal portion 11 is provided adjacent to the terminal portion 10. Further, a discharge circuit portion 5 is provided on the other end side of the circuit board 1 on the opposite side to the terminal portions 10 and 11 with the charging circuit portion 7 interposed therebetween, and on the opposite side to the charging circuit portion 7 with the discharge circuit portion 5 interposed therebetween. On the other end side of the circuit board 1, a structure in which a discharge-side terminal portion 12 that forms an input portion of the bus bar 9 is provided is used. Thus, an elongated and compact circuit board device 1a that can increase the distance between the terminal portions 10 and 12 is obtained.

  The bus bar 9 is made of a conductive member having a length dimension corresponding to the terminal portions 10 and 12. The bus bar 9 connects between the terminal portions 10 and 12 while being in close contact with at least the lower surface portion where the charging circuit portion 7 is located. Here, the bus bar 9 that is attached to the lower surface of the circuit board 1 is made of a member that secures a large area that covers most of the lower surface of the circuit board 1, for example, a strip-shaped conductive member. The entire side surface of the bus bar 9 is in close contact with the lower surface of the circuit board 1.

In particular, the conductive portions of the various circuit portions exposed on the lower surface of the circuit board 1 have high thermal conductivity between the lower surface of the circuit board 1 and the strip-shaped bus bar 9 so that the conductive portions of the various circuit portions are not electrically connected to the bus bar 9. A sheet-shaped insulating member, for example, a strip-shaped insulating paper 14 is interposed, and the entire bus bar 9 is sufficiently placed on the lower surface of the circuit board 1 (including the point where the charging circuit unit 7 is located) through the insulating paper 14. It is in close contact.
When the charging circuit unit 7 in which the discharging circuit unit 5 is inactivated by the bus bar 9 or the insulating paper 14, heat generated from the mounted components of the charging circuit unit 7 is transmitted from the circuit board 1 through the contact portion to the insulating paper. 14. Goes to the bus bar. In other words, the heat generated from the charging circuit unit 7 is radiated from the entire bus bar 9 where no current flows to a wide area below the circuit board 1 where no mounting components are formed.

  The bus bar 9 is attached to one end portion (one end portion) of the bus bar 9 so that it can be easily assembled between the terminal portions 10 and 12 even when the circuit board 1 is slightly warped. A structure is used in which the input side) is fixed to the circuit board 1 by soldering, and the other end (the other end), for example, the right end (output side) is locked to the circuit board 1 in this case.

  Specifically, as shown in FIG. 3 and FIG. 5, the locking structure includes a locking portion formed by a narrow strip portion at the right end portion of the bus bar 9, specifically, a strip portion. An L-shaped locking portion 16 having an L-shaped step is formed near the circuit board 1 by the thickness dimension of the substrate 1 and the insulating paper 14, and the terminal portion 10 of the circuit board 1 (the right end portion of the bus bar 9 is disposed). A structure is used in which a through hole 17 through which the band plate portion penetrates is formed at a point closer to the center from the terminal, and the locking portion 16 is locked to the upper surface of the circuit board 1. That is, the bus bar 9 is vertically oriented as shown by the arrow α in FIG. 5, and the tip of the locking portion 16 is inserted into the through hole 17 from the lower surface of the circuit board 1, and then the bus bar as shown by the arrow β in FIG. When 9 is turned sideways following the circuit board 1, the locking part 16 is locked on the terminal part 10 that forms the upper surface of the circuit board 1, and the bus bar 9 is held in the horizontal position.

  As a soldering structure, as shown in FIGS. 3 and 4, a plurality of projecting pieces 18 (corresponding to the soldering portion of the present application) projecting toward the circuit board 1 side are formed on the left end portion of the bus bar 9. A structure in which a plurality of through holes 19 for receiving the projecting pieces 18 from the lower surface is formed in the terminal portion 12 of the circuit board 1 (terminal on which the left end portion of the bus bar 9 is disposed) is used. That is, when the projecting piece 18 is inserted into the through hole 19 from the lower surface of the circuit board 1 and the leading end side of the projecting piece 18 and the land (not shown) of the terminal portion 12 are soldered, the left end portion of the bus bar 9 is connected to the terminal. It is fixed to the part 12.

  That is, the bus bar 9 first uses the locking structure to lock the right end portion of the bus bar 9 to the upper surface of the circuit board 1 by penetrating the through hole 17 and the lateral orientation of the bus bar 9, and then the remaining bus bar 9 9 is inserted into the through hole 19 of the circuit board 1 and the inserted protrusion 18 and the land of the terminal portion 12 are soldered. The mounting structure of the bus bar 9 that is locked on one side suppresses the troublesome soldering work involving positioning work and easily copes with the warp of the circuit board 1, so that the circuit board 1 is slightly warped. Even in this case, the bus bar 9 can be easily assembled to the circuit board 1. As shown in FIG. 3, a through hole 16 a facing the through hole 10 a formed in the terminal portion 10 is formed at the distal end portion of the band plate portion that forms the locking portion 16. The through holes 10a and 16a use the screw member 20 as shown in FIGS. 1, 2 and 5 to terminal the terminal portion 21 (not shown in FIGS. 1, 2 and 5) of the operating device (actuator). Used to connect (screw) the part 10. In addition, you may screw the latching | locking part 16 to the terminal part 10 with the screw member 20 independently.

  In the circuit board device 1 configured as described above, when the discharge circuit unit 5 is operated in response to an operation request of the actuator, the discharge current from the battery unit 2 is passed through the discharge circuit unit 5 to the terminal unit 12 and the circuit board. (1) Via the bus bar 9 and the terminal portion 10 on the back surface, it is supplied to the terminal portion 21 of the actuator to operate the actuator. That is, the discharge current flows through the bus bar 9 passing through the back surface of the circuit board 1 and is supplied to the actuator.

Further, when the charging circuit unit 7 is activated in response to the charging request, the charging current of the external power source from the charging terminal unit (not shown) of the circuit board 1 passes through the conductive path (not shown) and the charging circuit unit 7. The battery unit 2 is guided to charge the battery unit 2. Here, the charging circuit unit 7 includes mounting components that generate a large amount of heat. In particular, the calorific value is excessive.
Here, during charging, the discharge circuit unit 5 is not operating, and the discharge bus bar 9 passing through the back of the circuit board 1 is not used, that is, no current flows.

At this time, since the bus bar 9 is attached in close contact with at least the back surface portion where the charging circuit unit 7 is located, heat generated from the mounting component 8 due to the operation of the charging circuit unit 7 is insulated from the circuit board 1. It passes through the paper 14 and is transmitted to the bus bar 9 where no current flows, and is radiated from the bus bar 9 to a wide area (outside air) on the back surface side where no mounting components are mounted. During the charging, this heat radiation is performed to cool the charging circuit unit 7.
In other words, by utilizing the fact that the discharge circuit unit 5 and the charging circuit unit 7 do not operate at the same time, the bus bar 9 is used as a component that allows the original discharge current to flow during discharging, and the heat sink during charging. Is used to cool the charging circuit section 7 that causes excessive heat generation.

  Therefore, the charging circuit unit 7 that generates excessive heat can be cooled without using a dedicated heat sink separately as in the prior art. In particular, if the entire bus bar is expanded not only on the back side of the circuit board 1 where the charging circuit unit 7 is located, but also on the most part of the back side of the circuit board 1, high heat dissipation performance is secured from a wide heat dissipation area. Thus, the heat of the charging circuit unit 7 can be radiated more effectively.

  Thereby, the number of parts of the circuit board device 1 can be suppressed, and the cost spent on the circuit board device 1 can be reduced. Moreover, the charging circuit unit 7 having a high mounting density can be realized, and the circuit board device 1 can be made compact. In particular, when insulating paper 14 that is an insulating member having thermal conductivity is interposed between the back surface of the circuit board 1 and the bus bar 9, various conductive parts exposed on the back surface of the circuit board 1 are electrically connected to the bus bar 9. Since it can prevent, it is excellent also in safety (including the time of discharge).

In addition, when the circuit board device 1 is laid out so as to extend in one direction, the circuit board device 1 not only becomes compact, but the overall length of the bus bar 9 can be increased, so that the heat radiation area of the bus bar 9 can be increased. The charging circuit unit 7 can be effectively cooled.
In addition, the mounting of the bus bar 9 uses a mounting structure that combines soldering and a locking structure, so that even if the circuit board 1 is slightly warped, one side of the bus bar 9 is locked. By adopting, the bus bar 9 can be assembled by an easy operation.

  Note that the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention. For example, in one embodiment, a bus bar formed from a band plate member has been described. However, the present invention is not limited thereto, and a bus bar formed from another member may be used. Further, in one embodiment, an L-shaped projecting piece is used for the soldering portion of the bus bar and an L-shaped stepped portion is used for the locking portion of the bus bar. A locking portion may be used.

1 Circuit board 2 Battery unit (secondary battery)
5 Discharge circuit part 7 Charging circuit part 9 Bus bar 10, 12 Terminal part 14 Insulating paper (insulating member)
16 Locking part 18 Projection piece (soldering part)

Claims (4)

A circuit board provided on one side surface with a charging circuit unit for charging a chargeable / dischargeable secondary battery and a discharging circuit unit for discharging from the secondary battery;
A bus bar that is connected to the discharge circuit unit and guides a current discharged from the secondary battery to a predetermined position in accordance with the operation of the discharge circuit unit;
The bus bar is attached in close contact with the other side surface where the charging circuit portion is located on the other side surface of the circuit board,
A circuit board characterized in that, when the charging circuit unit is inactive, the heat generated by the operation of the charging circuit unit is dissipated from the bus bar through which no current flows through the circuit board. apparatus. The circuit board is provided with the charging circuit part in an intermediate part, and one terminal part to which one end part of the bus bar is attached is provided on one end side of the circuit board across the charging circuit part, and the charging circuit part is The discharge circuit portion is provided on the other end side of the circuit board opposite to the terminal portion sandwiched, and the other end side of the circuit board opposite to the charge circuit portion sandwiching the discharge circuit portion is provided. The other terminal portion to which the other end portion of the bus bar is attached is provided,
2. The circuit board device according to claim 1, wherein the bus bar is attached so that both end portions thereof are electrically connected to the terminal portions while being in close contact with at least the other side portion where the charging circuit portion is located. .   The circuit board device according to claim 1, wherein an insulating member having thermal conductivity is interposed between the other side surface of the circuit board and the bus bar. The bus bar has a soldering portion at one end and a locking portion at the other end,
4. The bus bar is attached to the circuit board by the locking part being locked to the circuit board and the soldering part being soldered to the circuit board. The circuit board device according to any one of the above.

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