JPH0482595A - Control unit-module and drying machine using its module - Google Patents

Abstract

PURPOSE:To prevent smoke and fire from being generated by integrating a power circuit in a hybrid IC, and by using the power lead terminal of an IC as the external lead of a control unit-module. CONSTITUTION:The only power-system circuit of a control unitmodule having a control-system circuit and the power-system circuit for drive-controlling the main section of a rotary machine is integrated in a hybrid IC 110, and a lead terminal 114 to be conducted from the IC 110 is used as a module external- terminal. Then, in the area of the power-system circuit at least, the coating of urethane resin can be unnecessary. Besides, on the connection of a lead wire for great current flowing through, the lead terminal 114 of the hybrid IC can be used as it is, without using a connector, and by mounting the hybrid IC 110 on a resin substrate for forming the control-system circuit, a device can be miniaturized.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a control unit module, and more particularly to a control unit module that can be used indoors in a humid environment and is attached to a rotating machine having a predetermined output power. .

(b) Prior Art A dryer is generally known as a typical rotating machine having a predetermined power and used indoors in a humid environment.

This dryer is generally constructed as shown in FIG. That is, (1) is a rectangular cylindrical machine frame, (2) is a cylindrical drum rotatably supported by a shaft within the machine frame (1), and (4) is attached to the front surface of the drum (2). a cylinder cover that forms the clothes input port (5); (6) is a lid body that is pivotally supported on the front surface of the machine frame (1) and is used to cover the clothes input port (5); A filter (9) is attached to the rear surface of the drum (2), and (9) is a rear cover attached to the rear surface of the machine frame (1), with an intake hole (10) in the center and an exhaust hole in the lower part. (11).

(12) is a fan casing disposed to divide the inside of the machine frame (1) into a drying chamber (13) that accommodates the drum (2) and a fan chamber (14); 1)
The drying chamber (13) and the fan chamber (1
4) an end plate (16) having an inlet (15) communicating with the
is installed on. A circulating air passage (17) is connected to the lower part of the casing (12), and the air circulation passage (17)
is arranged at the lower part of the drum (2), and its air passage outlet (17a) is applied to the discharge port (4a) formed in the cylinder cover (4). (18) (19)
) are positive temperature characteristic heaters (PTC heaters) disposed vertically in the circulation air passage (17), and (20) are positive temperature characteristic heaters (PTC heaters) disposed vertically in the circulation air passage (17);
17) is a drain provided at the bottom.

(21) is a disc-shaped resin double-sided fan, which is coaxially supported in the fan chamber (14) with the support shaft (22) of the drum (2), and circulates radially toward the front side. Feather (23
)... is formed, and cooling vanes (
24) is formed. (25) is the double-sided fan (
21) is a boob coaxially formed on the rear surface of the

(26) is a drive motor, which has drive shafts protruding from both ends and is fixed to one drive shaft (26a).
A belt (28) wound around the outer periphery of the drum (2) is connected to (27), and a small pulley (29) fixed to the other drive shaft (26b) and the pulley (25) are connected to the belt (27). (30).

(31) is a first negative characteristic thermistor disposed on the rear surface of the end plate (15), and (32) is a first negative characteristic thermistor disposed at the inlet of the heaters (18) and (19) of the drying air passage (17). 2 negative characteristic thermistor, (33> is a third negative characteristic thermistor disposed at the outlet of the heaters (18) and (19) of the drying air path (17>), (34) is a third negative characteristic thermistor disposed at the opening/closing of the lid body (6); It is a lid switch that opens and closes in conjunction with each other.

Such a dryer is described in Japanese Patent Application Laid-Open No. 63-277098.

The rotating drum (2) and fan (21) of the dryer described above,
Drive motor (26), thermistor (31) (32) (
33), heaters (18), (19), and other main parts are controlled by a control unit module.

FIG. 5 is a plan view showing a general control unit module, FIG. 6 is a sectional view taken along line II in FIG. 5, and FIG.
It is a sectional view taken along II-I in the figure.

As is clear from FIG. 5, this control unit module consists of a first module (2
10) and the second module (2
20).

The first module (210') of the control system has a plurality of switches (212) for operation, LED (213) for display, on a resin substrate (211) such as a Bunont substrate.
Irregular parts such as a large transformer (214) and multiple discrete parts (215) such as a microcomputer, a capacitor, and a resistor are mounted and connected in a predetermined manner by a conductor (216) formed on the back surface of the resin substrate (211). There is.

On the other hand, the second module (220) of the power system also uses a resin substrate (221), and a radiation fin (223) for heat radiation is attached to the substrate (221). is attached with a plurality of switching elements (224) such as triacs that generate heat to drive motors, heaters, etc. Also, a substrate (220)
A plurality of connectors (225) are fixedly attached to the top for connection with the above-mentioned motors, heaters, etc.

By the way, the first and second modules (210) (2
Since the rotating machine itself is used in a wet environment, the control unit module consisting of 20) has a thickness of about 3 mm to 3 mm on both sides of each substrate (211) and (221), as shown in FIGS. 5 and 6. Moisture-resistant treatment such as urethane resin (240) with a thickness of about 5 mm is performed. This moisture-resistant treatment is performed on the side substrate (211
Conductors (216) (226
) to prevent surface corrosion or short circuits due to water droplets between the conductors (216) and (226), and the substrate (211) (
221) This is performed to prevent a short circuit if water droplets adhere between the lead terminals of each mounted component mounted above, and this moisture-proofing treatment is essential in the control unit module structure.

Such a control unit module is attached to the machine frame (1) and arranged in the space between the machine frame (1) and the drum (2).

(A) Problems to be Solved by the Invention In the conventional control unit module structure, as described above, moisture-resistant treatment is applied, and the urethane resin (240) is attached to the module substrate (240).
11) It is essential to provide it on both sides of (221).

It goes without saying that it is certainly possible to prevent the infiltration of moisture such as water droplets by applying moisture resistance treatment.

However, there is a major problem in that smoking and ignition occur when the resin substrate is subjected to moisture-proofing treatment. This problem occurs on the power module side where the power circuit is formed. Since a large current of 30A to 50A class flows through the power circuit, the heat generated by the power module cannot be avoided. The expansion coefficient α of the resin substrate is 12 to 25 x 10-'/
"C, the expansion coefficient α of the moisture resistant agent (urethane resin) is 100X
Since the value is significantly different from IO-'/℃, stress is applied to the solder joints of the switching elements (224), connectors (225), etc. mounted on the resin substrates (211) (221) due to the heat generated by the power, and the As a result, cracks may occur, which may cause the urethane resin to smoke or catch fire. Currently, this problem is prevented by adding a re-soldering process to the solder joints where large currents flow, but it is difficult to completely prevent this problem with this process alone. In order to prevent cracks from forming in the solder joint, an additional soldering process must be performed, resulting in an increase in the number of work steps.

In addition to the above-mentioned reasons, there is another reason why the power module part emits smoke and ignites, that is, the occurrence of cracks.

That is, since the control unit module is directly attached to the dryer frame (1) as described above, the control unit module is attached to the rotating drum (2).
) rotates, the machine frame (1) will vibrate, and at the same time the control unit module will also vibrate. Since the connector (225) has a lead wire inserted and connected to the main part, the vibration causes the lead wire to vibrate and cause the connector (225) to vibrate.
5) Stress will be applied to the solder joints.

As a result, cracks occur in the solder joints of the connector (225), causing smoke and fire as described above. This problem is an unavoidable problem due to the structure of the dryer, and there is a risk that it will occur significantly as the dryer changes over time.

Furthermore, in the conventional structure, when performing moisture-resistant treatment with urethane resin, it is necessary to apply tape and resin coating to the top surface of the connector (225) to prevent the resin from entering the connector (225) and causing a connection failure. There was a problem in that the workability was significantly reduced due to the nature of the process.

Furthermore, in the conventional structure, both sides of the substrate (211) < 221) were coated with urethane resin (240) to provide moisture resistance, resulting in a problem of significantly increased work costs.

(d) Means for Solving the Problems The present invention has been made in view of solving the above-mentioned problems, and includes a control system circuit and a power system that drive and control the main parts of a rotating machine used indoors. A control unit module having a circuit is characterized in that the power system circuit is integrated into a hybrid IC made of an insulating substrate, and lead terminals derived from the hybrid IC are used as external terminals of the control unit module. .

(*) Effect As described above, according to the present invention, only the power system circuit of the control unit module having the control system circuit and power system circuit for driving and controlling the main parts of the rotating machine is integrated into the hybrid IC, and the power system circuit is integrated into the hybrid IC. By using the lead terminals derived from the hybrid IC as external terminals of the control unit module, the power circuit can be connected to the hybrid IC.
Since it is integrated within the C, it is possible to completely eliminate the need for coating with urethane resin as in the conventional case, at least in the power system circuit area.

In addition, as mentioned above, the power circuit is integrated within the hybrid IC, and by using its lead terminals as external terminals of the control unit module, the connection of lead wires that carry large currents can be made without using connectors as in the past. The lead terminals of the hybrid IC can be used as they are.

Furthermore, since the hybrid IC is mounted on the resin substrate on which the control system circuit is formed, it contributes to miniaturization of the entire control unit module.

(F) Embodiment The control unit module of the present invention will be explained in detail below based on the embodiment shown in FIGS. 1 and 2.

FIG. 1 is a plan view of a control unit module of the present invention, and FIG. 2 is a sectional view taken along line II in FIG. As shown in FIGS. 1 and 2, the control unit module of the present invention includes a resin substrate (100) on which a control system circuit is formed, and a hybrid IC that has a built-in power system circuit mounted on the resin substrate (100). (110) and hybrid IC
(110) A heat dissipation fin (120) placed on the top, a plurality of switches (130), an LED (140), an electronic buzzer (150), a transformer (160), and other odd-shaped parts, and a moisture-resistant resin agent (170) ).

In explaining the present invention, each component will be explained later, and first, a specific circuit of a rotating machine (hereinafter referred to as a dryer) will be briefly explained.

As shown in Figure 3, (51) is a lid switch that connects and disconnects the circuit in conjunction with opening and closing of the lid of the dryer, (52) is a constant voltage circuit, and (53) is a waveform shaping circuit, which is a commercial frequency AC The voltage is shaped into a rectangular wave pulse and applied to a microcomputer (hereinafter referred to as microcomputer) (54), which is used for time counting. (55) is a clock pulse oscillation circuit which generates a reference signal to advance the program in the microcomputer (54). (56) is an initial reset circuit that sets the program in the microcomputer (54) to the initial state when the power switch (50) is turned on.

(57) is a first temperature detection circuit that includes a first thermistor (not shown) as part of its configuration, (5g> is a second thermistor (
(not shown) is part of the configuration;
59) is a third temperature detection circuit that includes a third thermistor (not shown) as a part of the configuration, and receives the voltage value obtained by dividing the voltage value of each thermistor by a resistor and the output from the microcomputer (54). The comparison circuit in each temperature detection circuit (57), (5g), and (59) compares the output from the ladder circuit (60) that generates a staircase wave, and the comparison output is sent to the microcomputer (54).
Enter. Here, the ladder circuit (60) is connected to the output port of the microcomputer (54), and changes the ladder output stepwise as signals are sequentially output from each output terminal.

The microcomputer (54) determines each temperature based on the output state to the ladder circuit (60) when the above-described comparison circuit is connected and input.

(64> is the various L for display provided in the operating section of the dryer.
An LED drive circuit consisting of an ED, (65) a current transformer that detects the current flowing through the power supply circuit to which the dryer motor and heater are connected, and (66) a current transformer that converts the current signal from the current transformer (65). Microcomputer (54
) is an A/D converter.

(67), (68), and (69) are bidirectional cylisks that are activated by the output signal from the microcomputer (54) to conduct the energizing circuit to the motor and heater, and (70) is a buzzer circuit for operation termination and abnormality notification. It is. Such a circuit is implemented on the control unit module.

Each component of the present invention will be explained below.

First, the resin substrate (100) is a printed circuit board made of epoxy resin or the like, and the substrate (100) has a plurality of through holes (not shown) formed therein for connecting electronic components, and has holes on the back side. A conductive path (101) of a desired shape is formed using a conductive material such as copper foil. Although it is unnecessary to explain, this conductive path (101) is selectively connected to a desired through hole to establish a connection between each electronic component.

On this resin substrate (Zoo), electronic components and large irregularly shaped components mainly constituting a control system circuit are mounted. If we take the circuit diagram in Figure 3 as an example, the waveform shaping circuit (53) and the microcontroller (54) are used as examples of the control system circuit.
>, clock pulse generation circuit (55), initial reset circuit (56), first to third temperature detection circuits (57) (58
) (59), ladder circuit (60), LED circuit (64)
, current transformer (65) and A/D humbatterer (
66) is mounted at a predetermined position by a plurality of discrete components (102) such as a microcomputer, a resistor, and a capacitor. Furthermore, an LED element (140) is placed on the resin substrate (100).
), multiple switches (130), large transformer (160
) and an electronic buzzer (150) are mounted, and are connected by solder to electronic components constituting each circuit of the above-mentioned control circuit as necessary.

By the way, the above-mentioned LED element (140) and switch (
130) is installed at a predetermined distance from the body of the dryer, and is arranged so that its surface is exposed. Therefore,
The LED element (140>) and the switch (130) are mounted so as to be separated from the surface of the resin substrate (100) by a predetermined distance.The switch (130) is a so-called tact switch, so that it is separated from the surface of the substrate (100). It can be easily separated from the substrate (100) by simply extending the lead wire (141) of the LED element (140).
It can be separated from the surface. However, the LED element (14
In order to arrange a plurality of LED elements (140), it is necessary to make their heights uniform, so the LED elements (140) are arranged using a resin guide frame (
142) and mounted on the substrate (100).

By the way, one of the features of the present invention is that the power system circuit for driving the motor, heater, etc. of the dryer is integrated in the hybrid IC (110), and the power system circuit for driving the dryer motor, heater, etc.
100).

The substrate (111) (hereinafter simply referred to as IC substrate) of the hybrid IC (110) used in this embodiment is an aluminum substrate which has been insulated.

Although it is possible to use a substrate made of ceramics, glass epoxy, etc. other than the aluminum substrate, an aluminum substrate is used in this embodiment because it has a circuit portion that is relatively heat-generating.

The structure of the IC board (111) will be briefly explained. I
An insulating resin layer (not shown) such as epoxy or polyimide resin is provided on the C substrate (111), and a conductive path of a desired shape made of copper foil is formed on its upper surface.

The power system circuit formed on the IC board (111) is, for example, a constant voltage circuit (52), taking the circuit diagram of FIG.
) and the cyrisk (67) connected to the motor and heater.
)(68)(69) etc. are implemented. This IC board (1
11) All the power circuits mounted on the board are mounted as chip-shaped circuit elements (112), and carbon printed resistors, Ni-plated printed resistors, chip resistors, and chips are mounted on the board (111) as necessary. Elements such as capacitors are mounted and formed. Further, a plurality of external lead terminals (113) (114) are led out from the opposing peripheral edges of the IC board (111) and connected to the conductive paths (101) of the resin board (100) by soldering. In addition, the IC board (111) has a resin case material (
115) is fixed and a plurality of circuit elements (112) mounted on the IC substrate (111) are hermetically sealed.

The solder joints of the node terminals (1130114) fixed to the opposing peripheral edges of the IC board (111)
111) and a case material (115), and is completely fixed by a sealing resin (116) such as an epoxy resin filled in the space. by the way,
One lead terminal (113) is bent at a substantially right angle and is connected by solder to the conductive path (101) of the resin substrate (100) as described above, and the other lead terminal (114) is led out substantially horizontally. .

By the way, another feature of the present invention is that one of the lead terminals (113) described above is connected to a resin substrate (100).
) to the conductive path (101) of the other lead terminal (1
14) is used as an external lead terminal of the control unit module itself. That is, one lead terminal (1
13) is connected to each electronic component constituting the control system circuit mounted on the resin board (100), and the other lead terminal (114) is connected to the main parts of the dryer, such as the motor, heater, blower fan, etc. Connect directly to the lead terminal (
114) and are connected to each other. Even if the connector of the lead wire and the lead terminal (114) are inserted and connected, the connector and the lead terminal (114) are firmly fitted and will not be easily separated by a slight vibration or tensile force.

On the other hand, in order to use the other lead terminal (114) of the hybrid IC (110), that is, the power lead terminal, as the external lead terminal of the control unit module itself as described above, the hybrid IC (<110) is mounted on a resin substrate ( 100>.According to the mounting structure of this embodiment, the lead terminals 114) are led out from the peripheral edges of the resin substrate (100), so connection with the lead wires is difficult. It's easy to do.

Further, as shown in FIGS. 1 and 2, the mounting structure of the hybrid IC (110) is arranged such that the IC board (111) is on the top side. A heat dissipation fin (120) is placed on the IC board (111) in order to improve the heat dissipation effect.
is mounted and screwed so as to be integrated with the hybrid IC (110) and the resin substrate (<100) using screws (119).

The radiation fins <119) placed on the hybrid IC (110) are structurally mounted so that they are lower than the LED (140) and tact switch (130) mounted on the resin board (100). It is thought that it will be placed.

By the way, as shown in FIG. 2, the moisture resistance treatment of the present invention involves coating the surface of the resin substrate (Zoo) on which the conductive paths (101) are formed with a coating agent such as urethane resin. That is, it is the conductive path (10) that is protected by the coating resin (170').
1) and the solder joints between each mounted component and the conductive path (101) are all that is needed. If the coating resin is filled to the same height and the resin substrate (100), that is, the control unit module is placed within the frame, the conductive paths (101) and the joints of each electronic component will be reliably covered and protected by the resin. .

In addition, as shown in FIGS. 1 and 2, a resin substrate (10
0) One lead terminal (113) of the microcomputer, discrete components such as resistors (102) and the hybrid IC (110) that constitute the control circuit mounted on the
) is selectively coated with a coating resin (170). That is, since the pitch of the lead terminals of a discrete component (102) such as a microcomputer and the lead terminals of a hybrid IC (110) (<113) is relatively narrow, there is a risk of a short circuit caused by water such as water droplets unless resin coating is applied.

Therefore, discrete parts such as microcontrollers and resistors (10
2) and the lead terminal of the hybrid IC (110) (
113>. At this time, the resin (170) is poured by placing a mold, or the resin (170)
If 70) is set to maintain a certain degree of viscosity, it becomes possible to coat it relatively easily.

In addition, L E D (
140), tact switch (130), electronic buzzer (1
50) and the transformer (160), there is no need to cover them with resin (170) because the lead terminals are spaced apart and there is no risk of short circuiting due to water droplets or the like. However, if the resin (170) is selectively applied to each lead terminal of each component, the water resistance can be further improved.

According to the present invention, only the power system circuit of a control unit module having a control system circuit and a power system circuit that drive and control the main parts of a rotating machine such as a dryer is integrated into the hybrid IC (110). lead terminal (114) derived from the hybrid IC (110).
) as the external terminal of the control unit module, the power system circuit can be configured as a hybrid IC (110
), it becomes possible to completely eliminate the need for coating with urethane resin (170) as in the conventional case, at least in the power system circuit area. As a result, it is possible to completely prevent smoke and fire from occurring at the solder joints of the connectors that connect the power circuit and external equipment, as in the past, and it is possible to provide an extremely safe control unit module.

In this example, the hybrid IC (110) was mounted on the same surface as the odd-shaped component mounting surface of the resin board (100), but the mounting structure is not limited to this, and the mounting on the dryer body can be There is no problem even if the mounting surface is mounted on the opposite side to the odd-shaped component mounting surface using force.

(G) Effects of the Invention As detailed above, according to the present invention, a power circuit is integrated within a hybrid IC, and the /S hybrid IC is integrated.
By using the power lead terminal of C as the external lead of the control unit module, it is possible to eliminate the need for a dedicated connector for connecting to the main parts of the dryer and coating resin for the power circuit area. It is possible to completely prevent smoke and ignition, which had been a problem. As a result, even though the circuit function is the same as that of the conventional control unit module, the control unit module of the present invention is significantly more effective in terms of safety and reliability.

Furthermore, in the present invention, since the coating resin is selectively coated on the conductive path formation and electronic component mounting surface of the resin substrate, the amount of coating resin can be significantly reduced compared to the conventional method, and the cost effect is also large.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the control unit module of the present invention, Fig. 2 is a sectional view taken along the line II in Fig. 1, Fig. 3 is a general circuit diagram for driving and controlling a dryer, and Fig. 4 is a general circuit diagram. 5 is a plan view showing a conventional control unit module, and FIG. 6 is a sectional view taken along line I-I in FIG.
The figure is a sectional view taken along the line ■-■ in FIG. (100) is a resin substrate, (110) is a hybrid I
C, (120) is a radiation fin, (130) is a tact switch, (140) is L E D, (150)
is an electronic buzzer (160) is a transformer, (170)
is the coating resin.

Claims (6)

[Claims] (1) In a control unit module having a control system circuit and a power system circuit that drive and control the main parts of a rotating machine used indoors, the power system circuit is integrated into a hybrid IC made of an insulating substrate, and the A control unit module for a dryer, characterized in that a lead terminal derived from an IC is used as an external terminal of the control unit module. (2) The control unit module according to claim 1, wherein the power system circuit includes a plurality of switching elements, and the switching elements are mounted in a chip shape on the insulating substrate. (3) The control unit module according to claim 1, wherein the control system circuit is formed on a resin substrate, and the hybrid IC is mounted on the resin substrate. (4) The control unit module according to claim 3, wherein the control unit module is mounted so that the peripheral edge of the hybrid IC and the peripheral edge of the resin substrate are substantially aligned. (5) The control unit module according to claim 1, wherein an insulated metal substrate is used as the insulating substrate. (6) The dryer according to claim 1, 2, 3, 4, or 5, wherein the control unit module is attached to the main body of the dryer.