JPH0748545B2 - Control unit module - Google Patents

Description

The present invention relates to a control unit module, and more particularly to a control unit module attached to a rotating machine used in a wet environment.

(B) Conventional Technology A control board of a control unit module mounted on a rotating machine generally used in a water-humidity environment is subjected to a moisture-proof treatment (see Japanese Patent Laid-Open No. 60-158693). The reason for this is that if water droplets adhere to the control board, the water droplets can cause a short circuit between the lead terminals of the electronic components mounted on the control board or between the conductor patterns, preventing malfunctions such as malfunctions and failures of the control circuit. This is because

A control circuit including a resistor, a capacitor, a microcomputer, and a heat-generating triac is mounted on the control board described above. When an input signal from the outside is received, the control circuit for the drive motor of the rotating machine or the like is received based on the signal. Controls the operation of external loads.

FIG. 7 to FIG. 10 show the structure in the case where the above-mentioned control unit module is attached to a washing machine used especially in a wet environment, which will be briefly described below.

Reference numeral (119) is a rectangular box-shaped frame member that houses the substrate (118), and is made of synthetic resin. The frame member (11
In 9), (120) ... are boss-like lower receiving portions formed to project from the bottom surface along the lateral side walls (119a) (119b) of the frame member (119), and both ends and the center. A total of 6 locations are provided on the side, and among these, along one lateral direction side wall (119a), ribs (121) ... To the other side wall (119b) are connected. (122) (122) are used to suppress the floating of the substrate (118) from above, and the one side wall (119) in the lateral direction.
It is the upper receiving part formed in a).

Reference numerals (123) and (123) denote elastic locking pieces formed to project from the bottom surface along the other side wall (119b) in the lateral direction of the frame member (119).

(126) ... the frame member (119) to the front panel (160).
It is a screw hole for screwing to the boss (127) provided on the back surface of a).

On the outer bottom surface of the frame member (119), (128) is provided at the longitudinal end of the frame member (119) (the position where the fixing portion (124) is located) and opens inward. A fitting piece (129) protruding from the end of the thin switch (116) is fitted therein. Reference numerals (130) and (130) denote engaging claws provided on both sides of the frame member (119) in the vicinity of the other end in the longitudinal direction, and protrude from both side edges of the thin switch (116) in the vicinity of the other end. The engaging pieces (131) (131) are engaged.

The lower receiving portion (120) ..., the upper receiving portion (122) (12
2), latching pieces (123) (123), fixing parts (124), screw holes (126), fitting recesses (128) and engaging claws (130) (13)
0) are all integrally provided when the frame member (119) is molded.

A coating agent (132) such as a urethane resin, which is a moisture resistant agent, is injected into the frame member (119), and the substrate (118) and electronic components mounted on the substrate (118) are coated with the coating agent (132). Completely covered to prevent problems such as water drops.

The control board (118) thus coated.
And the thin switch (116) as a unit, and the thin switch (116) is brought into close proximity to an operation button (not shown) of the front panel (160a) to make the frame member (119).
Is attached to the rotating machine by screwing it in at multiple places.

(C) Problems to be Solved by the Invention Generally, a printed circuit board is mainly used as the control board. The printed circuit board on which the circuit for driving and controlling the main parts of the rotating machine is formed is generally designed to be as small as possible in order to minimize the storage space for mounting on the rotating machine. is there. However, in recent years, the number of rotating elements and electronic components mounted on a printed circuit board has increased due to the multi-functionalization of rotating machines, and it has been desired to downsize the rotating machines or increase the clothes inlet of the washing machine. Since it is rare, there was some limitation on the size of the printed circuit board. Therefore, originally, pattern placement was formed on the substrate and components were mounted without being able to consider what should be done in consideration of component placement and pattern wiring.

As a result, it becomes very weak against self-noise, and there is a problem that malfunctions due to noise occur.

Since the size of the board is restricted as described above, there are many cases in which the wiring lines of the wiring pattern for connecting a large number of electronic components and the like become thin and broken, and the control board itself becomes defective.

It is difficult to lead out the lead wires for connecting to the main part of the rotating machine from the specified position on the printed circuit board.For example, many lead wires are led out near the relatively high electronic components mounted on the printed circuit board. There was a problem that the installation work was difficult.

Further, in the conventional control unit module, since electronic components such as a large number of discrete components are soldered and mounted on the control board (printed circuit board), the number of solder connection points becomes extremely large and post-processing after solder connection is performed. There is a problem that the process becomes complicated and the workability is deteriorated.

Furthermore, the conventional control unit module has a structure in which the board and most of the electronic components are completely covered with urethane resin in order to protect the connection parts of the electronic components mounted on the control substrate from water and moisture, and the weight of the control unit module is heavy. Become. As a result, in the case where the switch means is integrally formed with the module, even if the module is screwed to the rotating machine, if the module changes with time, the screw fixing force becomes weak due to the weight of the module itself, which causes a problem in the switch operation. Further, there is a problem that the cost becomes high because a large amount of urethane resin is used.

Furthermore, when the conventional control unit module is attached to a rotating machine such as a washing machine, the shape of the control board becomes an elongated shape due to the structure of the washing machine. The substrate is distorted by temperature changes because the difference in the expansion coefficient α of
There is a problem that cracks occur at the solder joint portion of the electronic component mounted on the substrate, and the defect rate is improved.

(D) Means for Solving the Problems The present invention has been made in view of the above problems, and is a control unit module mounted on a rotating machine that is driven by a motor and is used in a relatively humid environment. A plurality of integrated boards, in which circuits for driving and controlling the rotating machine are integrated, are arranged on the control board of the control unit module so as to be substantially parallel to the control board.

(E) Action As described above, according to the present invention, the control board of the control unit module is provided with a plurality of integrated boards in which the minimum circuits for controlling the drive of the rotating machine are integrated. The size of can be reduced.

Further, since the control board is not completely covered with a waterproof resin such as urethane as in the conventional case, the amount of the waterproof resin used can be reduced by 40 to 60% as compared with the conventional case. As a result, the weight of the unit module is significantly lighter than the conventional one, and the cost is also greatly affected.

(F) Embodiment Hereinafter, the control unit module of the present invention will be described based on the embodiment shown in FIG. 1 to FIG.

FIG. 1 is a plan view of a control unit module (hereinafter simply referred to as module) (1) of the present invention, and FIG.
It is an II sectional view of the figure. (2) is a frame member, (3) is a control board, (4) is a power transformer, (5a) and (5b) are integrated boards, (6) is a capacitor, (7) is an electronic buzzer, and (8).
Is a connector for connecting an external switch board, (9a) (9b)
Is a hole through which lead wires for power and small signals are led out,
(10) is a slit hole, (11) (11a) is a water resistant resin, (1
5a) and (15b) are leads for power and small signals.

The frame member (2) is formed of a synthetic resin such as epolyether styrene in the shape of a rectangular box which is substantially the same as or longer than the substrate. On the bottom of the frame member (2), a space (2a) having an elastic force for maintaining a predetermined space with a control board (3) described later is provided, and on the side surface side of the frame member (2). An engaging portion (2b) that engages the substrate (3) is provided in the. Further, a screw portion (2c) necessary for attaching (screw fixing) to the rotating machine is provided at a predetermined position of the frame member (2).

A printed circuit board is used as the control board (3), and a pattern (3
a) is formed on the substrate (3), and a plurality of integrated substrates (4), electronic buzzers (7), capacitors (6) and other relatively large electronic components and main circuits are integrated. 5a) and (5b) and a connector (8) are mounted to drive and control the main part of the rotating machine.

As described above, in the field of rotating machines, miniaturized and multifunctional rotating machines have become the mainstream along with the sophistication. FIG. 3 is a plan view showing an operating portion of a washing machine, which is a typical example of a water-humidified environment, and (27) is a washing time setting button,
(28) is the rinse number setting button, (29) is the dehydration time setting button,
(20) is a water flow intensity setting button, (21) is a button for selecting whether or not to perform water rinsing, (22) is a standard course or a manual course setting and start button for manually inputting each process time, (2
3) is the setting and start button for the speedy course that performs the whole process in 23 minutes, and (24) is the stop button for temporary stop.
LEDs correspond to the various operation buttons, and they are turned on / off as appropriate according to the operation. Further, (25) is a display part of the water temperature rank detected by the temperature detection device, which indicates high temperature, medium temperature,
LED (26a) (26b) (26c) corresponding to low temperature display
Is lit up. Such a button and a circuit for drive control corresponding to the LED display are formed on the substrate (3), and the circuit configuration tends to become more and more complicated.

By the way, one of the features of the present invention is that a main circuit for driving and controlling a rotating machine is provided with a plurality of integrated substrates (5a) (5a).
The purpose is to integrate them by dividing them into b) and mount the respective substrates (5a) and (5b) on the control substrate (3).

The integrated substrates (5a) and (5b) used in this embodiment include:
For example, a substrate such as an aluminum substrate, a ceramic substrate, a glass epoxy substrate, or a phenol substrate that has been subjected to an insulation treatment can be used.

As the integrated substrates (5a) and (5b) used in this embodiment, two substrates are used, as is clear from FIG. Since the power system circuit is formed on one integrated substrate (5a), the aluminum substrate described above is used in consideration of its heat generation (heat dissipation effect), and the small signal system circuit is formed on the other integrated substrate (5b). Therefore, although not particularly limited, the same aluminum substrate as one integrated substrate (5a) is used here.

Here, the structure of the integrated substrates (5a) and (5b) will be briefly described. An insulating resin layer (not shown) such as epoxy or polyimide resin is provided on the integrated substrates (5a) and (5b), and a conductive path (5c) of a desired shape formed of copper foil is formed on the upper surface thereof.

On one integrated board (5a), a heat-generating circuit element (5d) such as a power supply circuit composed of a plurality of triac elements and a plurality of rectifying diodes for driving a motor of a rotating machine is mounted, and the other integrated board (5b). ) A plurality of circuit elements (5e) constituting a control circuit such as a microcomputer for controlling a motor and a predetermined portion of the rotating machine are mounted on the above. Circuit elements (5d) mounted on each integrated board (5a) (5b)
(5e) are all mounted in a chip shape, and elements such as a printing resistor, a chip resistor, and a chip capacitor are mounted and formed on each of the substrates (5a) and (5b) as required. Further, a plurality of external lead terminals (5x) (5y) are bent and led out from one peripheral edge (or opposing peripheral edges) of both integrated boards (5a) (5b), and are led out to form a conductor pattern of the control board (3). (3
Soldered to a).

When the integrated boards (5a) and (5b) are mounted on the control board (3), as shown in FIG. 2, one of the integrated boards (5a) is taken into consideration in consideration of heat generation of the power system circuit. ) Is mounted on the upper surface side (electronic component mounting surface), and the other integrated substrate (5b) is mounted on the opposite surface. That is, since the small signal circuit is formed on the other substrate (5b) as described above, it hardly generates heat, so that it is completely covered with the moisture resistant agent (coating resin) described later. The other board (5b)
When mounting on the control board (3), the lead terminal (5y) of the other board (5b) and the conductor of the control board (3) are connected to each other, that is, the lead terminal (5y) is arranged on one board. (Five
Consider so that they are placed at positions where a) and the control board (3) overlap.

In addition to the integrated boards (5a) and (5b), large electronic components such as a transformer (4) and a capacitor (6) and a connector (8) are mounted on the control board (3) and a conductor pattern of the board (3). Soldered to (3a). The transformer (4) is for converting a voltage, for example, AC100V is converted to 10V, the capacitor (6) is for rectifying the output voltage of the hybrid IC (5), and the connector (8) is a switch input. It is connected to the substrate.

On the other hand, the control board (3) is provided with a plurality of slit holes (10). The slit holes (10) are integrated substrates (5a) (5
The external lead terminals (5x) of the integrated boards (5a) (5b) are provided in the periphery of the integrated board (5a) (5b) so as to surround the b) and even if the control board (3) is distorted by stress due to the slit hole (10) ) (5y) absorbs the stress due to strain to some extent,
The occurrence of cracks or the like at the solder joints between the external lead terminals (5x) (5y) and the substrate (3) due to strain is prevented.

The holes (9a) and (9b) for leading out the lead wires (15a) and (15b) are provided on the control board (3) because the main circuits are integrated on a plurality of integrated boards (5a) and (5b) in the present invention. Several are mounted such as integrated boards (5a) and (5b), transformers (4), capacitors (6) and connectors (8).
Therefore, the conductor pattern (3a) formed on the control substrate (3) may be a minimum wiring pattern, so that the conductor pattern (3a) can be efficiently set. As a result, it is possible to arbitrarily provide the lead wire lead-out holes (9a) and (9b) for power and small signals, without increasing the size of the control board (3).

Therefore, the power lead wire (15a) is led out from one partition area, for example, and the small signal lead wire (15b) is led out from the other partition area. Each lead wire (15a) (1
5b) is bundled and connected to each main part of the rotating machine,
In the structure of the present invention, since the respective lead wires (15a) and (15b) are separated from each other, workability is improved.

The control board (3) on which the mounting components such as the integrated boards (5a) and (5b) are mounted is arranged in the box-shaped frame member (2). When the control board (3) is arranged on the frame member (2), the space (2a) of the frame member (2) provides a space between the board (3) and the frame member (2) at a predetermined interval, and The board (3) is locked by a locking portion (2b) provided on the frame member (2).

By the way, when the substrate (3) is arranged on the frame member (2),
The frame member (2) is filled with a coating resin (11) for a moisture resistant agent such as urethane. This coating resin (1
The amount of the coating resin (11) is set so that 1) is filled only in the space formed by the substrate (3) and the frame member (2). That is, only the conductor pattern (3a) and the solder joint portion (5z) between each mounting component and the conductor pattern (3a) need be protected by the coating resin (11). You just need to fill. In this embodiment, if the coating resin (11) is filled up to the same height as the space (2a) in advance, the conductor pattern (3a) of the substrate (3) and each joint are surely protected by the resin (11). To be done. Further, when it is desired to ensure protection, the amount of the coating resin (11) should be increased a little. In this case, the excess resin flows out from the space between the substrate (3) and the side surface of the frame member (2), but there is no problem.

By the way, since the other integrated substrate (5b) is mounted on the back surface side of the control substrate (3) (the surface opposite to the electronic component mounting) as described above, the other substrate (5b) is coated with the coating resin (1).
It is completely covered by 1), and there is no problem with moisture resistance.

On the other hand, since one board (5a) of the power system is mounted on the control board (3), the circuit elements mounted on the one board (5a) are exposed. The coating resin (11a) is arranged between the one substrate (5a) and the control substrate (3). More specifically, one of the substrates (5a) is arranged such that its circuit forming surface faces the control substrate (3) surface, and the gap between them is kept at about 3 mm to 5 mm. In order to maintain the gap, it is relatively easy to form the gap by mounting one substrate (5a) on the control substrate (3) via a spacer (not shown). Therefore, when the coating resin (11a) is arranged between the control substrate (3) and the one substrate (5a), the resin (11a) can be relatively easily filled by the capillary phenomenon by pouring the resin (11a).

If the power lead terminals (5x) have a narrow pitch, a water drop may cause a short circuit unless the resin is coated, so the lead terminals (5x) are also completely covered with the coating resin. Resin (11) that covers the external lead terminals (5x)
a) is a resin (11a) which is formed by arranging a mold when filling the resin (11a) between the one substrate (5a) and the substrate (3) described above.
a) or if the coating resin (11a) is set to maintain a certain degree of viscosity, it is relatively easy to apply resin (5x) between one substrate (5a) and the substrate (3) and to the external lead terminal (5x). 11a) can be placed.

Therefore, when the resin (11a) is filled between the one substrate (5a) and the control substrate (3), the tip portion of the lead terminal (5y) connecting the other substrate (5b) and the control substrate (3) is also At the same time, it is protected by the resin (11a) and there is no risk of short circuiting due to water droplets.

Transformer (4) other than integrated boards (5a) and (5b) mounted on control board (3), capacitor (6), connector (8)
For large parts such as, there is no possibility of short circuit due to water droplets etc. because the distance between lead terminals is large
There is no need to coat a). However, the water resistance can be improved by not selectively applying the resin (11a) to each lead terminal of each component. Although the lead terminals of the connector (8) are not shown in the figure, the resin (11
It is better to fill in a).

In this way, the control unit module (1) is completed. Such a module (1) is screwed and fixed to a predetermined portion of the rotating machine by a screw portion (2c) of the frame member (2).

When this type of module (1) is attached to a rotating machine such as a washing machine, a switch board having various input switches is arranged on the exposed surface side of the module (1) due to the structure of the washing machine.
The switch board and the control board (3) are connected to each other via a connector (8) by a flexible lead wire (not shown).

FIG. 4 shows a switch substrate (30) formed for various input switches, in which conductive contact portions formed on a flexible film are arranged to face each other through an opening of an insulating spacer. Also, (31) is the switch board (3
It is a strip-shaped flexible lead wire that connects 0) and the control board (3).

The number of switches formed on the switch substrate (30) increases as the function becomes higher. For example, if the switches are formed by the number of the input switches shown in FIG. 3, the switch substrate is necessarily long due to the structure of the washing machine. Therefore, if the switch substrate is longer than the control substrate (3) of the module (1), even if the module is screwed into the washing machine, the switch function is surely provided in the area overlapping the substrate (3). However, since the switch substrate is not supported in the non-overlapping region, there arises a problem that the operation cannot be performed while having the switch function.

Therefore, the frame member (2) of the module used in this embodiment is formed longer than the control board (3). That is, the length is set to be substantially the same as that of the switch board (not shown). In FIG. 5, (2x) shows an outer frame of the frame member (2), (2c) is a screwed portion for fixing to the washing machine,
The portion indicated by the dotted line area is a reinforcing portion (2y) for preventing the deformation of the frame member (2). Although not shown in the figure, the reinforcing portion (2y) is formed on the outer surface of the frame member (2), and the switch substrate is arranged on the surface. Further, the control board (3) is arranged in the shaded area, and the above-mentioned moisture resistance treatment is performed.

FIG. 6 is a sectional view when the module of the present invention is attached to a washing machine, (1) is a control unit module of the present invention, (2) is a frame member constituting the module (1),
(3) is a control board, (5a) and (5b) are integrated boards, (11) is a coating resin, (160) is an operation part for screw-fixing the module (1), and (200) is a module (1). It is a top plate of a washing machine having a frame portion which accommodates the operation part (160) fixed and fixed and which forms a clothes inlet of the washing machine. The same reference numerals as those in FIG. 7 of the conventional example are used for the respective components. Therefore, description of each part is omitted.

According to the present invention, the size of the control board can be reduced by mounting a plurality of integrated boards in which circuits for driving and controlling the rotating machine are integrated on the control board of the control unit module. it can.

Further, since the control board is not completely covered with a waterproof resin such as urethane as in the conventional case, the amount of the waterproof resin used can be reduced by 40 to 60% as compared with the conventional case. As a result, the weight of the unit module is significantly lighter than the conventional one, and the cost is also greatly affected.

(G) Effect of the Invention As described in detail above, according to the present invention, the size of the control board can be reduced by mounting the integrated board on which the main circuits are integrated on the control board.

Further, according to the present invention, the coating resin amount of the moisture resistant agent can be significantly reduced. As a result, the weight of the control unit module itself can be made lighter than before, and the switch substrate can be firmly fixed when the module is mounted on the rotating machine (washing machine), so that the looseness of the screwed portion due to the weight of the module can be prevented. There is an advantage that the switch operation can be stably performed regardless of the change over time.

Further, in the present invention, since the main circuit is integrated on the integrated substrate, the number of components mounted on the control substrate can be significantly reduced. As a result, the size of the control board can be reduced, and the width of the conductor pattern formed on the control board can be made uniform to a certain extent and the defect due to the disconnection of the conductor pattern as in the conventional case can be extremely suppressed.

Further, according to the present invention, since the slit hole is provided in the control substrate around the integrated substrate mounted thereon, even if the control substrate is distorted, the stress due to the strain is directly applied to the joint portion of the external lead terminal of the integrated substrate. Since cracks are not added to the solder joints of the external lead terminals, reliability can be improved.

Further, according to the present invention, as described above, since the integrated substrate having the metal substrate is mounted on the module, the heat generated during the heat radiation has an effect of drying the surrounding moisture.

[Brief description of drawings]

1 is a plan view showing a control unit module of the present invention, FIG. 2 is a sectional view taken along the line I--I of FIG. 1, FIG. 3 is a plan view showing a display portion of a general rotating machine, and FIG. FIG. 5 is a plan view showing a switch substrate, FIG. 5 is a plan view showing a frame member when the module of the present invention is used in a washing machine, and FIG. 6 is a cross-sectional view showing an operating portion of the module of the present invention. FIG. 8 is a cross-sectional view showing an operating portion of a conventional washing machine, FIG. 8 is a plan view showing a conventional module, and FIG. 9A is a side view of FIG.
FIG. 9B is a sectional view of FIG. 9A, and FIG. 10 is a sectional view of FIG. 9A. (1) is a control unit module, (2) is a frame member,
(3) control board, (4) transformer, (5) hybrid IC, (6) capacitor, (7) electronic buzzer,
(8) is a connector, (9a) and (9b) are lead wire lead-out holes,
(10) is a slit hole, (11) and (11a) are coating resins, and (15a) and (15b) are lead wires for power and small signals.

Claims (3)

[Claims] 1. A control board of a control unit module,
Two integrated boards in which circuits for driving and controlling a rotating machine are integrated are arranged so as to be substantially parallel to the control board, a power system circuit is formed on one integrated board, and the other integrated board is formed. Is a control unit module in which a small signal system circuit is formed and both integrated substrates are arranged opposite to each other with the control substrate interposed therebetween. 2. The control according to claim 1, wherein the other integrated substrate is arranged in a space formed by the frame member of the control unit module and the control substrate and is covered with a moisture resistant resin. Unit module. 3. The one integrated substrate has a circuit forming surface arranged on the control substrate side, and a moisture resistant resin is arranged between the one integrated substrate and the control substrate. Control unit module.