JPH0567078U - Power conversion unit - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a power conversion unit that has a small outer shape and reduces the effects of noise. [Structure] A printed wiring board 3 on which a voltage / current detection circuit of the main circuit is mounted is erected on one side of a printed wiring board 2 on which main circuit components are mounted. D on the other side of the printed wiring board 2
The printed wiring board 4 on which the C / DC converter circuit and the gate drive circuit are mounted is erected. The printed wiring board 1 on which a control circuit is mounted is installed on the tips of these printed wiring boards 3 and 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power conversion unit incorporating a switching element and a printed wiring board.

[0002]

[Prior Art]

 FIG. 3 is a plan view showing an example of a power conversion unit used for backup of a DC power supply of a conventional uninterruptible power supply, and FIG. 4 is a perspective view of FIG. 3 and 4, a total of six short columns 7B are erected on the front surface of the aluminum cooling fin 15 having a plurality of parallel folds 15a formed on the back surface thereof, and a plurality of power transistors, etc. The heat dissipation portion of the module element 8 is fixed.

A substantially square printed wiring board 12 is provided in parallel with the cooling fins 15 at the front ends of the pillar 7B and the module element 8 and fixed to the pillar 7B. It is inserted and fixed in a through hole (not shown) of the plate 12. The terminal connected to one side of the flat cable 13 is connected to one side of the printed wiring board 12, and four long columns 7A are erected on the front side of the printed wiring board 12 in the middle and the other side. ing. On the front surface of the printed wiring board 12, main circuit components 9 such as transistors and capacitors are mounted between the four columns 7A. Outside the main circuit components 9, a gate drive circuit of the switching element and a main circuit. The component 10 of the DC / DC converter circuit for the voltage and current detection circuit and control circuit is mounted.

Further, a rectangular printed wiring board 11 is fixed to the front end of the pillar 7A, and a component of a control circuit for controlling main functions of the power conversion unit is mounted on the printed wiring board 11. ing. In addition, a terminal (not shown) is provided on one side of the printed wiring board 11, and the other side of the flat cable 13 described above is connected thereto.

In the power conversion unit configured as described above, the heat generated in the module element 8 is transferred to the cooling fins 15 and cooled by the cooling air rising between the folds 15a, so that the upper and lower printed wiring boards are cooled. The exchange of signals between 11 and 12 is performed via the flat cable 13.

[0006]

[Problems to be solved by the device]

 However, in the power conversion unit configured as described above, the flat cable 13 that connects the printed wiring board 12 and the printed wiring board 11 on which the control circuit is mounted becomes long and is affected by noise. Therefore, it is conceivable to mount the DC / DC converter circuit for the control circuit and the component 10 of the gate drive circuit on the front printed wiring board 11, but the above DC / DC converter circuit and gate drive circuit are There is also a high voltage part, and noise and heat are generated due to high-speed switching, so it cannot be used.

On the other hand, the printed wiring board 12 is equipped with main circuit components through which a high-voltage main circuit current flows, so that the width of the pattern is wide, and the low-voltage circuit and the high-voltage circuit coexist. The insulation gap becomes wider and the outer shape of the substrate becomes larger. As a result, the power conversion unit has a substantially trapezoidal shape in the plan view of FIG. Therefore, an object of the present invention is to obtain an electric power conversion unit having a small outer shape and capable of reducing the influence of noise.

[0008]

[Means for Solving the Problems]

 The present invention is directed to a first printed wiring board on which main circuit components are mounted and a second printed wiring board on which one side of the first printed wiring board is erected and on which a DC / DC converter circuit and gate drive circuit components are mounted. A wiring board, a third printed wiring board which is provided on the other side of the first printed wiring board and on which detection circuit components for detecting the voltage / current of the main circuit are mounted, and second and third printed wiring boards. Is a power conversion unit including a printed wiring board for a control circuit, which is installed at the tip of the wiring board so as to face the first printed wiring board.

[0009]

[Action]

 The main circuit, the DC / DC converter circuit, the gate drive circuit, and the voltage / current detection circuit of the main circuit are connected at the base ends of the second and third printed wiring boards, and the DC / DC converter circuit and the gate drive circuit are connected. Also, the voltage / current detection circuit of the main circuit and the control circuit are connected at the tips of the second and third printed wiring boards, and the first printed wiring board and the printed wiring board for control circuit have almost the same outer shape. Become.

[0010]

【Example】

 An embodiment of the power conversion unit of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a power conversion unit of the present invention, which corresponds to FIG. 3, and FIG. 2 is a partially enlarged detailed view of FIG.

In FIGS. 1 and 2, a printed wiring board 1 on which components of a control circuit are mounted is attached to the front side of the power conversion unit as in the conventional case. There is no terminal for connecting the conventional flat cable 13 shown in FIG. 3, and instead, as shown in FIG. 2, a plurality of card edge connectors 6 each having a built-in contact spring are attached on the left and right rear surfaces.

On the other hand, on the front side of the module element 8, a printed wiring board 2 having the same outer shape as the printed wiring board 1 is attached, and on the printed wiring board 2, main circuit elements and capacitors of the main circuit are mounted. Because of this capacitor, the outline of the mounted component has a convex shape as shown in FIG. As shown in FIG. 2, card edge connectors 6 are attached to the left and right sides of the printed wiring board 2 on the front side.

Among them, the card edge connector 6 on the left side in FIG. 1 removes the voltage and current of the main circuit, which is mounted on the printed wiring board 12 on the back side in FIG. A printed wiring board 3 on which a detection circuit component such as a secondary circuit is mounted is vertically inserted with the mounting surface inside.

On the other hand, in FIG. 1, the card edge connector 6 on the right side is a control connected between the main circuit element and the control circuit component, which is also mounted on the printed circuit board 12 on the back side in FIG. A printed wiring board 4 on which a DC / DC converter circuit component for a circuit and a gate drive circuit component are mounted is inserted vertically with the mounting surface facing inward, facing the printed wiring board 3.

According to the power conversion unit configured as above, the printed wiring boards 3 and 4 having the function of transmitting and receiving signals and the function of the circuit are provided on both sides between the front and rear printed wiring boards 1 and 2. This not only shortens the circuit components for signal transmission / reception but also arranges a gate drive circuit component that generates noise due to high-speed switching on one side of the unit, and provides a voltage / current detection circuit for analog signals that are vulnerable to noise. By placing the components on the opposite side of the gate drive circuit with the main circuit element sandwiched between them, the effect of noise can be reduced.

Further, by mounting the DC / DC converter circuit component and the gate drive circuit component on the printed wiring board 4, the printed wiring board 2 on the rear side becomes smaller, and the outer shapes of the upper and lower printed wiring boards 1 and 2 are reduced. Since the external shape of the conventional trapezoidal unit is a rectangular parallelepiped, the unit can be made compact, and it can be stored more efficiently in the power converter that houses this unit. The outer shape of the stored power conversion device can be reduced.

[0017]

[Effect of the device]

 As described above, according to the present invention, the first printed wiring board on which the main circuit components are mounted, and the DC / DC converter circuit and the gate drive circuit components mounted upright on one side of the first printed wiring board are mounted. The second printed wiring board, the third printed wiring board on which the detection circuit component for detecting the voltage / current of the main circuit is provided upright on the other side of the first printed wiring board, the second printed wiring board, and the second printed wiring board. The main circuit, the DC / DC converter circuit, and the gate drive are constructed by configuring a power conversion unit composed of a printed wiring board for a control circuit installed at the tip of the printed wiring board of No. 3 so as to face the first printed wiring board. Circuit and the main circuit voltage / current detection circuit are connected at the base ends of the second and third printed wiring boards, and the DC / DC converter circuit and gate drive circuit as well as the main circuit voltage / current detection circuit and control circuit are connected. Connected at the tips of the 2nd and 3rd printed circuit boards, separated the 2nd and 3rd printed circuit boards, made the printed circuit board of the main circuit smaller, and made it almost the same as the printed circuit board of the control circuit. It is possible to obtain a power conversion unit that is small and can reduce the influence of noise.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a power conversion unit of the present invention.

FIG. 2 is a partially enlarged detailed view of the power conversion unit of the present invention.

FIG. 3 is a plan view showing an example of a conventional power conversion unit.

FIG. 4 is a perspective view of a conventional power conversion unit.

[Explanation of symbols]

1, 2, 3, 4 ... Printed wiring board, 5 ... Cooling fins, 6
... card edge connector, 7A, 7B ... pillar, 8 ... module element.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H05K 1/14 D 7047-4E

Claims (1)

[Scope of utility model registration request] 1. A first printed wiring board on which a main circuit component is mounted, and D provided upright on one side of the first printed wiring board.
A second printed wiring board on which a C / DC converter circuit and a gate drive circuit component are mounted, and a detection circuit component that stands on the other side of the first printed wiring board and detects the voltage / current of the main circuit are mounted. And a printed circuit board for a control circuit, which is installed at the tips of the second and third printed wiring boards facing the first printed wiring board.