JP2957658B2 - Control unit module - Google Patents

Description

The present invention relates to a control unit module, and more particularly to a control unit module used in a room in a humid environment and attached to a rotating machine having a predetermined output power. .

(B) Conventional technology Generally, a drier is known as a typical rotary machine used with a predetermined power in a room for circulating water and moisture.

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 in the machine frame (1), and (4) is mounted on the front surface of the drum (2). A cylinder cover forming a clothing slot (5), (6) is pivotally supported on the front of the machine frame (1), and a lid for covering the clothing slot (5); A filter mounted on the rear surface of the drum (2), (9) a rear cover mounted on the rear surface of the machine frame (1), an intake hole (10) in the center, and an exhaust hole (11) in the lower part. )have.

(12) is a fan casing arranged to partition the inside of the machine frame (1) into a drying chamber (13) for accommodating the drum (2) and a fan chamber (14). 1) It is mounted on an end plate (16) having a suction port (15) which is installed in the center and communicates the drying chamber (13) and the fan chamber (14). The lower part of the casing (12) has a circulation air passage (1
7) is connected, and the air path (17) is disposed below the drum (2), and the air path outlet (17a) has a discharge port (4a) formed in the cylinder cover (4). ) ... (18) and (19) are positive temperature characteristic heaters (PTC heaters) arranged vertically in the circulation air passage (17), and (20) is a drain port provided at the bottom of the air passage (17). It is.

Numeral (21) is a disk-shaped resin double-sided fan, which is supported coaxially with the support shaft (22) of the drum (2) in the fan chamber (14), and circulates radially on the front side. The blades (23) are formed, and the cooling blades (24) are formed on the rear side. (25) is a pulley formed coaxially on the rear surface of the double-sided fan (21).

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

(31) is a first negative characteristic thermistor disposed on the rear surface of the end plate (15), and (32) is a first thermistor disposed at the inlet of the heater (18) (19) of the drying air path (17). 2 Negative characteristic thermistor, (33) is the heater (18) of the drying air path (17)
(19) a third negative temperature coefficient thermistor disposed at the outlet, (34)
Is a lid switch that opens and closes in conjunction with opening and closing of the lid (6).

Such a dryer is described in JP-A-63-277098.

Rotating drum (2), fan (21),
The drive control of the main parts such as the drive motor (26), thermistors (31) (32) (33), and the heaters (18) (19) is performed by a control unit module.

FIG. 5 is a plan view showing a general control unit module, FIG. 6 is a II sectional view of FIG. 5, and FIG. 7 is a II-II sectional view of FIG.

As apparent from FIG. 5, the control unit module includes a first module (210) constituting a control system circuit and a second module (2) constituting a power system circuit.
20).

The first module (210) of the control system includes a plurality of switches (212) for operation, an LED (213) for display, and a large transformer (214) on a resin substrate (211) such as a printed circuit board.
A conductor (216) formed on the back surface of a resin substrate (211) on which a plurality of discrete components (215) such as a microcomputer, a capacitor, and a resistor are mounted.
Are connected in a predetermined manner.

On the other hand, a resin substrate (221) is also used for the second module (220) of the power system, and a radiation fin (223) for heat radiation is mounted on the substrate (221). Is mounted with a plurality of switching elements (224) such as triacs that generate heat for driving a motor, a heater, and the like. Further, a plurality of connectors (225) for connecting to the above-described motor, heater, and the like are fixed on the substrate (220).

By the way, the first and second modules (210) (22)
Since the rotating machine itself is used in a water and humidity environment, as shown in FIGS. 5 and 6, the control unit module consisting of the substrates (211) and (221) has a thickness of about 3 mm or less on both surfaces thereof. Five
Moisture resistant treatment of urethane resin (240) of about mm is performed. This moisture-resistant treatment prevents corrosion of the surfaces of the conductors (216) and (226) formed on the back surfaces of both substrates (211) and (221) or short-circuit due to water droplets between the conductors (216) and (226). This is performed in order to prevent a short circuit when water droplets adhere between the lead terminals of each mounted component mounted on (221), and this moisture resistance treatment is indispensable in the control unit module structure.

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

(C) Problems to be Solved by the Invention In the conventional control unit module structure, as described above, the moisture-resistant treatment and the urethane resin (240) are applied to the module substrate (21).
1) It is indispensable to provide on both sides of (221).

Needless to say, it is possible to prevent the intrusion of moisture such as water droplets by performing the moisture resistance treatment.

However, by applying moisture resistance treatment to the resin substrate,
There is a major problem that ignition occurs. This problem occurs on the power module side where the power circuit is formed. Since large currents of 30A to 50A class flow through the power circuit, heat generation of the power module cannot be avoided. The expansion coefficient α of the resin substrate is 12 to 25 × 10 ^-6 / ° C, and the expansion coefficient α of the moisture-resistant agent (urethane resin) is 100 × 10 ^-6 / ° C. 211) (2
21) Stress is applied to the solder joints of the switching element (224), the connector (225), and the like mounted thereon, and as a result, cracks are generated, and the cracks may cause the urethane resin to smoke or ignite. At present, as a countermeasure, an additional soldering step is added to a solder joint where a large current flows to prevent it, but it is difficult to completely prevent it only by this step. As described above, a follow-up soldering step must be performed in order to prevent cracks from forming in the solder joint, and there is a problem that the number of working steps increases.

Further, there is another cause for the smoke and ignition of the power module, that is, the generation of cracks, in addition to the above-mentioned reasons. That is, since the control unit module is directly attached to the machine frame (1) of the dryer as described above, the machine frame (1) is vibrated by the slight vibration generated when the rotating drum (2) rotates, and at the same time, The control unit module will also vibrate. Since the connector (225) has a lead wire for connection to the main part inserted and connected,
The vibration also applies vibration to the lead wire and the connector (22
Stress will be applied to the solder joint of 5). As a result, cracks occur at the solder joints of the connector (225), and smoke and fire occur as described above. This problem is an unavoidable problem due to the structure of the dryer, and there is a risk that the problem will occur significantly due to aging.

Furthermore, in the conventional structure, when performing moisture resistance treatment with urethane resin, it is necessary to apply tape to the upper surface of the connector (225) and apply resin coating to prevent the resin from entering the connector (225) and causing connection failure. Therefore, there is a problem that the workability is remarkably reduced due to the nature.

Further, in the conventional structure, since both surfaces of the substrates (211) and (221) are coated with the urethane resin (240) and subjected to the moisture resistance treatment, there is a problem that the operation cost is significantly increased.

(D) Means for Solving the Problems The present invention has been tried in view of the above problems,
In a control unit module having a control system circuit and a power system circuit for driving and controlling a main part of a rotating machine used indoors, the control system circuit and the power system circuit are integrated in a hybrid IC composed of an insulating substrate, respectively. The two hybrid ICs are mounted on a resin substrate, and a lead line formed of a conductor connecting the two hybrid ICs formed on the resin substrate is extended so as to be adjacent to each other, and is extended on the extended lead line. It is characterized in that a moisture-resistant resin agent is disposed selectively.

(E) Operation As described above, according to the present invention, the control system circuit and the power system circuit for driving and controlling the main part of the rotating machine are each integrated in a separate hybrid IC, and both hybrid ICs are mounted on a resin substrate. Like the conventional control unit module, by extending the conductive paths connecting the hybrid ICs mounted and formed on the resin substrate adjacently and selectively arranging urethane resin on the adjacent conductive paths. It is possible to eliminate the need for urethane resin coating on both surfaces of a simple resin substrate.

In addition, as described above, the power system circuit is integrated in the hybrid IC, and its lead terminals can be used as external terminals of the control unit module. The lead terminal of the hybrid IC can be used without using it.

Further, since the control circuit and the power circuit are integrated in the hybrid IC, it is possible to contribute to downsizing of the control unit module.

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

FIG. 1 is a plan view of a control unit module of the present invention,
FIG. 2 is a sectional view taken along the line II of FIG. As shown in FIGS. 1 and 2, the control unit module of the present invention comprises a resin substrate (100), a first hybrid IC (110) mounted on the resin substrate (100) and having a built-in power system circuit, Radiation fin (120) mounted on first hybrid IC (110), second hybrid IC (110A) with built-in control system circuit, multiple switches (130), LED
(140), a modified part such as an electronic buzzer (150), a transformer (160), and a moisture-resistant resin agent (170).

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

As shown in FIG. 3, (51) is a lid switch for intermittently connecting and disconnecting the circuit in response to opening and closing of the lid of the dryer, (52) is a constant voltage circuit, (53) is a waveform shaping circuit, and is a commercial frequency AC. The voltage is shaped into a rectangular wave pulse, applied to a microcomputer (hereinafter referred to as a microcomputer) (54), and used for time counting. (55) is a clock pulse oscillating circuit for transmitting a reference signal for causing a program in the microcomputer (54) to proceed. (56) is the initial reset circuit, the power switch (50)
When the is input, the program in the microcomputer (54) is set to the initial state.

(57) is a first temperature detection circuit having a first thermistor (not shown) as a part of the configuration, (58) is a second temperature detection circuit having a second thermistor (not shown) as a part of the configuration, (5)
Reference numeral 9) denotes a third temperature detection circuit which includes a third thermistor (not shown) as a part thereof, and receives a value obtained by dividing a voltage value of each thermistor by a resistor and an output from the microcomputer (54). The output from the ladder circuit (60) that generates the staircase wave is compared with the comparison circuits in the temperature detection circuits (57), (58), and (59), and the comparison output is input to the microcomputer (54). 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 the output terminals. The microcomputer (54) determines each temperature based on the output state to the ladder circuit (60) when the above-mentioned comparison circuit is turned on and input.

(64) are various LEs for display provided on the operation unit of the dryer.
LED drive circuit composed of D, (65) is a current transformer for detecting the current flowing in the power supply circuit to which the motor and heater of the dryer are connected, and (66) is a current transformer (65)
A / A that converts the current signal from the
D converter.

(67) (68) (69) is a bidirectional thyristor that is ignited by the output signal from the microcomputer (54) and conducts the current supply circuit to the motor and heater, and (70) is a buzzer circuit for operation termination and abnormality notification It is. Such a circuit is mounted on the control unit module.

 Hereinafter, each component of the present invention will be described.

First, a printed board made of epoxy resin or the like is used as the resin board (100), and a plurality of through-holes (not shown) for connecting electronic components are formed in the board (100). A conductive path (101) having a desired shape is formed of a conductive material such as a copper foil. Needless to say, the conductive path (101) is selectively connected to a desired through-hole and a connection between electronic components is made.

On the resin substrate (100), a first hybrid IC (110) in which a power system circuit is integrated, a second hybrid IC (110A) in which a control system circuit is integrated, and a large-sized irregular component are mounted.

A feature of the present invention is that a first hybrid IC (110) in which a power system circuit is integrated and a second hybrid IC (110A) in which a control system circuit is integrated are mounted on a resin substrate (100). Where you do it.

First and second hybrids used in this embodiment
IC (110) (110A) substrate (111) (111A) (hereinafter simply IC
The substrate is referred to as an aluminum substrate which is insulated. As a material other than the aluminum substrate, for example, a substrate made of ceramics, glass epoxy, or the like can be used. However, in this embodiment, an aluminum substrate is used because there is a circuit portion having relatively high heat generation.

The structure of both IC substrates (111) and (111A) will be briefly described. An insulating resin layer (not shown) such as epoxy or polyimide resin is provided on both IC substrates (111) and (111A), and a conductive path of a desired shape formed by a copper foil is formed on the upper surface thereof.

Describing the first hybrid IC (110),
The power circuit formed on the C substrate (111) is, for example, a third circuit.
Taking the circuit diagram as an example, the thyristor (67) (68) connected to the constant voltage circuit (52) and the motor and heater
(69) etc. are implemented. All the power circuits mounted on this IC board (111) are mounted with chip-shaped circuit elements (112), and the carbon print resistance, Ni plating print resistance, Elements such as chip resistors and chip capacitors are mounted and formed. Further, a plurality of external lead terminals (1
13) (114) is derived and the conductive path (10
1) Solder connection. A resin case material (115) is fixed to the IC substrate (111), and a plurality of circuit elements (112) mounted on the IC substrate (111) are hermetically sealed.

The solder joints of the lead terminals (113) and (114) fixed to opposing peripheral edges of the IC substrate (111) are arranged in a space formed by the IC substrate (111) and the case material (115), Encapsulation resin such as epoxy resin filled in the space (116)
Completely fixed by. By the way, one lead terminal (113) is bent at a substantially right angle and soldered to the conductive path (101) of the resin substrate (100) as described above, and the other lead terminal (114) is led out substantially horizontally. ing.

Next, the second hybrid IC (110A) will be described. As a control system circuit formed on this IC substrate, for example, taking the circuit diagram of FIG. 3 as an example, a waveform shaping circuit (53), a microcomputer (54) ), Clock pulse oscillation 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 circuits such as the A / D converter (66) are integrated. The circuit elements (not shown) mounted on the IC substrate are all mounted in a chip form, similarly to the circuit elements mounted on the power IC substrate (111). Elements such as carbon print resistors, chip resistors, and chip capacitors are mounted on the IC substrate as needed. Further, a plurality of external lead terminals (113A) and (114A) are led out from opposing peripheral edges of the IC substrate and the resin substrate (100)
With the conductive path (101). A resin case material (not shown) is fixed to the IC substrate, and a plurality of circuit elements mounted on the IC substrate are hermetically sealed.

The solder joints of the lead terminals (113A) and (114A) fixed to the opposing peripheral edges of the control IC substrate are formed of the IC substrate and the case material in the same manner as the first hybrid IC (110). And is completely fixed by a sealing resin such as an epoxy resin filled in the space. Each lead terminal (113A) (114A) of the second hybrid IC (110A) is bent substantially at a right angle, and is soldered to the conductive path (101) of the resin substrate (100) as described above.

Components such as an LED (140), a switch (130), a transformer (160), and an electronic buzzer (150) are mounted as odd-shaped components, and are mainly connected to the above-described second hybrid IC (110A).

By the way, the LED element (140) and the switch (13
0) is mounted so as to be separated from the body of the dryer by a predetermined distance, and is arranged so that its surface is exposed. Therefore, LED
The 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. Switch (13
Since 0) is a so-called tact switch, it can be easily separated from the substrate (100) surface. Also, the LED element (140) can be easily separated from the substrate (100) surface only by extending the lead wire (141). However, to arrange a plurality of LED elements (140), the LED elements (140) are arranged on a resin guide frame (142) and mounted on the substrate (100) because of the need to make the heights uniform. And
It is supported to keep its height constant.

Meanwhile, one lead terminal (113) of the first hybrid IC (110) mounted on the resin substrate (100) is connected to the conductive path (101) of the resin substrate (100) as described above. In the present invention, the other lead terminal (114) is used as an external lead of the control unit module itself.

That is, one lead terminal (113) is connected to a second hybrid IC (110A) in which a control system circuit mounted on a resin substrate (100) is integrated, and the other lead terminal (114) is connected to a dryer. The lead wires (114) are inserted directly into the lead terminals (114) by a connector provided at the end of a lead wire (not shown) for connection to main parts such as a motor, a heater and a blower fan, 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 to each other, so that the connector and the lead terminal (114) are not easily detached by a slight vibration or tensile force.

On the other hand, since the other lead terminal (114) of the first hybrid IC (110), that is, the power lead terminal is used as an external lead terminal of the control unit module itself as described above, the hybrid IC (110) is made of resin. Substrate (1
(00). According to the mounting structure of the present embodiment, the lead terminals (114) are led out from the peripheral edge of the resin substrate (100), so that connection with the lead wires can be easily performed.

Also, the first and second hybrid ICs (110) (110)
In the mounting structure A), as shown in FIGS. 1 and 2, the respective IC substrates are arranged on the upper surface side. Radiation fins (120) are placed on the IC substrate (111) of the first hybrid IC (110) because of the need to improve the heat radiation effect.
The first hybrid IC (110) and the resin substrate (100) are screwed together so as to be integrated by screws (119).

Radiation fins (1) mounted on the hybrid IC (110)
19) LED mounted on resin substrate (100) due to mounting structure
(140) and the tact switch (130).

On the other hand, since only the first and second hybrid ICs (110) and (110A) and odd-shaped components are mounted on the resin substrate (100), the conductive paths (10) formed on the resin substrate (100) are formed.
1) The number is extremely small. That is, the control system circuit and the power system circuit are each a hybrid IC (110) (110
Since the connection is made within A), the connection on the resin substrate (100) is made by connecting the first and second hybrid ICs (110) and (110A), the second hybrid IC (110A) and the odd-shaped parts. There are only a few that make connections to

Therefore, the pattern design of the conductive path (101) formed on the resin substrate (100) can be extremely easily performed. In addition, conductive paths (10
Since the interval of 1) can be sufficiently set, short-circuiting due to water droplets can be prevented without performing moisture resistance treatment. However, in the present invention, the conductive paths (101) are arranged as close as possible. That is, the conductive paths (101) for the lead lines formed on the resin substrate (100) are formed to extend so as to be adjacent to each other. By adopting such a wiring structure, there is an advantage at the time of the moisture resistance treatment.

Here, as shown in FIG.
The urethane resin (170) is arranged so as to cover the lead terminals (113) (113A) (114A) of the second hybrid IC (110) (110A). Each lead terminal (113)
Since the lead pitch intervals of (113A) and (114A) are relatively narrow, short circuits may occur due to water droplets.
0) Only the lead terminals (113), (113A), and (114A) of the hybrid ICs (110) and (110A) mounted thereon may be coated with the urethane resin (170).

Also, there is a possibility that a short circuit may occur due to water droplets at the solder joint between the lead terminals (113) (113A) (114A) and the conductive path (101) of the resin substrate (100), so that the urethane resin (17
0) may be selectively coated.

As described above, the lead lines of the conductive paths (101) connecting the mounted components formed on the resin substrate (100) are formed so as to extend adjacent to each other as shown in FIG. ) On the adjacent extended conductive path (101), the moisture-proof treatment of the control unit module can be completed.

In addition, large components such as LED (140), tact switch (130), electronic buzzer (150), and transformer (160) mounted on resin substrate (100) are separated from each other by the distance between lead terminals. There is no need to coat the resin (170) because there is no danger of short-circuiting due to water drops 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. In the case of coating the urethane resin (170), it is possible to relatively easily coat the resin (170) if the mold is arranged and the flow is performed, or if the resin (170) is set to have a certain degree of viscosity.

According to the present invention, the control system circuit and the power system circuit for driving and controlling the main part of the rotating machine are integrated in respective individual hybrid ICs, and both hybrid ICs are mounted on the resin substrate and mounted on the resin substrate. The formed conductive path (101)
Are disposed adjacent to each other, and the urethane resin is selectively disposed on the conductive path (101) disposed adjacent thereto, thereby making it unnecessary to coat the both surfaces of the resin substrate with the urethane resin as in the conventional control module unit. Can be. As a result, the amount of urethane resin can be significantly reduced.

In addition, as described above, the power system circuit is integrated in the hybrid IC, and its lead terminals can be used as external terminals of the control unit module. The lead terminal of the hybrid IC can be used without using it. As a result, it is possible to completely prevent smoke and ignition at the solder joint of the connector for connecting the power circuit and the external device as in the related art, and it is possible to provide an extremely safe control unit module.

(G) Effects of the Invention As described in detail above, according to the present invention, the power circuit is integrated in the hybrid IC, and the power lead terminal of the hybrid IC is used as the external lead of the control unit module to achieve the drying. This eliminates the need for a dedicated connector for connecting to the main part of the machine and a coating resin for the power circuit area, thereby completely preventing smoke and ignition, which have conventionally been a major problem in the power circuit area.
As a result, the control unit module of the present invention has a remarkable effect in terms of safety reliability even with the same circuit function as the conventional control unit module.

Further, according to the present invention, the control system circuit and the power system circuit are integrated in separate hybrid ICs and mounted on a resin substrate, so that each hybrid IC
By simply coating the lead terminals with a urethane resin, a moisture-resistant treatment can be performed and the amount of the urethane resin can be significantly reduced, so that the effects in terms of workability and cost are great.

Further, according to the present invention, the conductive paths for wiring formed on the resin substrate are formed to extend adjacent to each other, and the entire surface of the resin substrate is coated with the urethane resin by simply coating the urethane resin on the conductive paths. It has the same effect as doing

[Brief description of the drawings]

FIG. 1 is a plan view showing a control unit module of the present invention, FIG. 2 is a cross-sectional view taken along line II of FIG. 1, FIG. 3 is a general circuit diagram for driving and controlling a dryer, and FIG. 5 is a sectional view showing a conventional control unit module, FIG. 6 is a sectional view taken along line II of FIG. 5, and FIG. 7 is a sectional view taken along line II-II of FIG. It is. (100) is a resin substrate, (110) and (110A) are first and second
Hybrid IC, (120) is a radiation fin, (130) is a tact switch, (140) is an LED, (150) is an electronic buzzer,
(160) is a transformer, and (170) is a coating resin.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D06F 58/28 H01L 25/00 H05K 7/14

Claims (1)

(57) [Claims] 1. A control unit module for a dryer having a control system circuit and a power system circuit for driving and controlling a main part of a rotary machine for a dryer used indoors, wherein the control system circuit and the power system circuit. Are integrated in a hybrid IC made of an insulating substrate, and the two hybrid ICs are mounted on a resin substrate, and lead wires formed of conductors connecting the two hybrid ICs formed on the resin substrate are extended so as to be adjacent to each other. A control unit module for a dryer, wherein a moisture-resistant resin agent is selectively disposed on the extended wiring line.