JP2002228238A - Wiring plate and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the area of a control plate, and prevent erroneous operation from happening in an air conditioner. SOLUTION: On an wiring plate which serves to electrically connect a control plate provided on an outdoor machine of an air conditioner equipped with an indoor machine and the outdoor machine for controlling the operation of the air conditioner, there are packaged a noise removal circuit electrically connected to the control plate and a commercial electric power supply through a conductor wiring for removing noise from electric power from the commercial electric power supply, and an inner/outer transmission circuit electrically connected to the control plate and the indoor machine through a conductor wiring for converting a signal from the indoor machine and outputting it to the control plate, and further converting a signal from the control plate and outputting it to the inner machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric circuit board, and more particularly to an electric circuit board used for an air conditioner. The present invention also provides
The present invention relates to an air conditioner, particularly to an air conditioner having an electric circuit board.

[0002]

2. Description of the Related Art In a separate type air conditioner including an indoor unit and an outdoor unit, when a signal (operation mode, set room temperature, etc.) from a remote controller is received by an indoor unit, the signal is transmitted to an electric cable. Is transmitted to the control panel of the outdoor unit via the. The control board controls the refrigerant circuit based on the received signal (operation mode, set room temperature, etc.), whereby cool or warm air is supplied from the indoor unit to the room. Further, the control plate adjusts the temperature of cold air or warm air so that the room temperature becomes the set room temperature.

The control board is a control device in which electronic components are mounted on a printed circuit board. The mounted electronic components include an inverter circuit for driving the compressor of the refrigerant circuit, and a microcomputer for controlling the inverter circuit and the four-way switching valve / reducer of the refrigerant circuit. Further, on the control board, there is provided a noise removal circuit for removing noise that enters the control board from the commercial power supply or is released from the control board to the commercial power supply, and internal and external circuits for transmitting and receiving signals to and from the indoor unit. And a transmission circuit. A terminal board is provided at one end of the control board, and the terminal board is electrically connected to the conductive pattern on the control board, so that the control board of the outdoor unit is connected to the indoor unit and the commercial power supply. .

In this air conditioner, electric power introduced from a commercial power supply to a terminal block is input to a noise elimination circuit on a control board, where the noise is eliminated, and then output to an inverter circuit. The high-voltage signal introduced from the indoor unit to the terminal block is converted into a low-voltage signal through the internal and external transmission lines and output to the microcomputer. On the other hand, the low-voltage signal output from the microcomputer is converted into a high-voltage signal on the internal and external transmission lines,
Output to the outdoor unit.

[0005]

Since a high voltage and a large current are input to the noise elimination circuit and the internal and external transmission lines, the distance between the conductive patterns on the control board is increased to secure the insulation distance, and the conductive pattern is formed. The current capacity is widened to ensure the current capacity.
As a result, the area of the control plate is increased, which hinders miniaturization of the outdoor unit. In addition, since the noise removal circuit and the microcomputer are mounted on the same conductive pattern, noise may be mixed in a signal input to the microcomputer, and the microcomputer may malfunction.

An object of the present invention is to reduce the area of a control plate in an air conditioner. Another object of the present invention is to prevent a malfunction in an air conditioner.

[0007]

An electric circuit board according to claim 1 is provided in an air conditioner having an indoor unit and an outdoor unit,
A circuit board for electrically connecting a control board for controlling the operation of the air conditioner to an indoor unit and a commercial power supply, comprising a conductor wiring, a noise removing circuit, an internal / external transmission circuit, and a resin member. The conductor wiring is formed of a thin metal plate, and can be electrically connected to a control plate, an indoor unit, and a commercial power supply. The noise removing circuit is electrically connected to the control board and the commercial power supply via the conductor wiring, and removes noise that enters the control board from the commercial power supply or noise that is released from the control board to the commercial power supply. The internal / external transmission circuit is electrically connected to the control board and the indoor unit via conductor wiring, converts a signal from the indoor unit to output to the control board, and converts a signal from the control board to convert the indoor unit into a signal. Output to The resin member is integrally formed with the conductor wiring, and has a hole for electrically connecting the conductor wiring to the noise removal circuit and the internal / external transmission circuit. Here, an inverter circuit for driving the compressor of the refrigerant circuit and a microcomputer for controlling the inverter circuit and the like are mounted on the control board.

In the electric circuit board according to the first aspect, the electric power introduced from the commercial power supply to the electric circuit board is input to the noise removal circuit via the conductor wiring, where the noise is removed, and the control board is supplied via the conductor wiring. Output to the inverter circuit above. Also, a signal input from the indoor unit to the electric circuit board is input to the internal / external transmission path via the conductor wiring, converted into a predetermined voltage here, and output to the microcomputer on the control board via the conductor wiring. On the other hand, a signal inputted from the microcomputer on the control board to the electric circuit board is inputted to the internal / external transmission circuit via the conductor wiring, converted into a predetermined voltage here, and outputted to the indoor unit via the conductor wiring.

The conductor wiring of the circuit board is formed of a thin metal plate and is insulated by a resin member, so that the current capacity is large and the insulation distance is short. Therefore, according to the electric circuit board according to claim 1,
The noise elimination circuit and the internal / external transmission circuit to which a high voltage and a large current are input can be mounted in a small space. Thus, the area of the control plate can be reduced without increasing the size of the electrical components. Further, since the microcomputer on the control board and the noise elimination circuit are physically separated from each other, it is possible to prevent noise from being mixed in a signal input to the microcomputer.

[0010] The air conditioner according to claim 2 includes an indoor unit, a refrigerant pipe, an outdoor unit, a control plate, and an electric circuit board. The indoor unit causes indoor air to exchange heat with the refrigerant, and supplies cool air or warm air to the room. One end of the refrigerant pipe is connected to the indoor unit, and the refrigerant pipe can flow the refrigerant. The outdoor unit is connected to the other end of the refrigerant pipe, forms a refrigerant circuit with the indoor unit and the refrigerant pipe, and supplies the compressed or decompressed refrigerant to the indoor unit via the refrigerant pipe. The control plate controls the refrigerant circuit. The electric circuit board is the electric circuit board according to claim 1. According to the air conditioner of the second aspect, the same operation and effect as in the case of the electric circuit board of the first aspect are exhibited.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Overall Configuration] FIG. 1 is a block diagram showing a schematic configuration of an air conditioner according to one embodiment of the present invention. The air conditioner of the present invention includes a refrigerant circuit 1, a drive circuit 2, and a control circuit 3, as shown in FIG. The control circuit 3 controls the refrigerant circuit 1 and the drive circuit 2, drives the refrigerant circuit 1 by the output from the drive circuit 2, controls the flow of the refrigerant in the refrigerant circuit 1, and adjusts the room temperature.

FIG. 2 shows a specific configuration of the refrigerant circuit 1.
The refrigerant circuit 1 is connected to a compressor 11, a four-way switching valve 12 connected to the discharge side of the compressor 11, an outdoor heat exchanger 13 connected to the four-way switching valve 12, and an outdoor heat exchanger 13. A pressure reducer (electric expansion valve) 14, an indoor heat exchanger 15 connected to the pressure reducer 14, and an accumulator 16. Compressor 11, four-way switching valve 12, outdoor heat exchanger 1
3, the decompressor 14 and the accumulator 16 are provided in the outdoor unit, and the indoor heat exchanger 15 is provided in the indoor unit. Fans for supplying an airflow to the outdoor heat exchanger 13 and the indoor heat exchanger 15 are arranged in the outdoor unit and the indoor unit, respectively.

The compressor 11 sucks the refrigerant from the suction side,
This is a device that compresses the refrigerant and discharges the compressed refrigerant from the discharge side. The four-way switching valve 12 has four pipe connection parts (A,
B, C, D), and pipes connected to each other are conducted between A and B and between C and D (solid line) or between A and D and between B and C (dotted line), thereby forming a flow path. Is a device for changing The outdoor heat exchanger 13 is formed by folding a refrigerant pipe to have an L shape in plan view. The reason why the shape is an L shape in a plan view is to increase the contact area with the air flow. The decompressor 14 is a device that decompresses and discharges the refrigerant, for example, an electric expansion valve is used. The indoor heat exchanger 15 is composed of a plurality of flat fins arranged in parallel and a refrigerant pipe penetrating therethrough. The fins are formed of a material having good heat conductivity such as aluminum in order to increase the heat exchange efficiency between the air and the refrigerant, and a plurality of the fins are arranged in parallel to increase the contact area with the air. . Accumulator 1
Reference numeral 6 denotes a device connected to the suction side of the compressor 11 for preventing liquid refrigerant from entering the compressor 11.

FIG. 3 shows the structure of the drive circuit 2 for driving the refrigerant circuit 1. The drive circuit 2 mainly includes a rectifier circuit 21 and an inverter 22. The rectifier circuit 21 includes a diode bridge, a large-capacity aluminum electrolytic capacitor, and the like, and has an input side connected to the commercial power supply 20. The inverter 22 is a bridge circuit including a power element such as an FET or an IGBT, and is driven by a drive signal from the control circuit 3. In this drive circuit, the commercial power supply 2
When power from 0 is input to the rectifier circuit 21, it is rectified by the diode bridge of the rectifier circuit 21 and smoothed by the aluminum electrolytic capacitor. The rectified and smoothed power is input to the inverter 22. Inverter 2
When the two power elements are driven by the drive signal from the control circuit 3, the output from the rectifier circuit 21 is converted into a power signal of a predetermined frequency and output to the motor 11a of the compressor 11. Thus, the compressor 11 is driven.
Further, by adjusting the frequency of the drive signal from the control circuit 3, the rotation frequency of the compressor 11 is adjusted, and the cooling or heating capacity is adjusted.

FIG. 4 shows the configuration of the control circuit 3. The control circuit 3 mainly includes a control unit 30, a memory 31, a sensor 3,
2, a circuit board 33, an indoor unit microcomputer 51, an I / F 52, a receiving unit 53, and a sensor 54. The control unit 30, the memory 31, the sensor 32, and the drive circuit 2 are mounted on a control plate 45 described later.

The control unit 30 includes a refrigerant circuit 1 and a drive circuit 2
This is a configuration for controlling. The control unit 30 includes a microprocessor that executes a program of a predetermined control procedure to control the refrigerant circuit 1 and the drive circuit 2, and a drive circuit that generates a drive signal to be output to the drive circuit 2. I have. The memory 31 stores a set room temperature, a set humidity, an operation mode, a control procedure program, and the like. The memory 31 may be provided separately from the control unit 30 as shown in FIG. 4 or may be built in the microprocessor.
The sensors 32 include a temperature sensor that detects an outside air temperature and a temperature sensor that detects a refrigerant pipe temperature. Circuit board 33
Is a drive circuit 2, a control unit 30, a commercial power supply 20, and an I / F
52. The electric circuit board 33 includes a noise removal circuit that removes noise included in the electric signal from the I / F 52 and noise that enters the control board 45 from the commercial power supply 20 or is released from the control board 45 to the commercial power supply 20. / F
An interface circuit for converting the electric signal from the control unit 52 into an electric signal that can be received by the control unit 30 is included. The indoor unit microcomputer 51 transmits an electric signal from the receiving unit 53 and the sensor 54 to the electric circuit board 33 via the I / F 52. I /
F52 converts the electric signal from the indoor unit microcomputer 51 into an electric signal of a predetermined level and outputs the electric signal to the electric circuit board 33. The receiving unit 53 receives a signal from a remote controller or the like and outputs the signal to the indoor unit microcomputer 51. The sensors 54 include a temperature sensor for detecting room temperature and a humidity sensor for detecting indoor humidity.

[Air-conditioning operation] In such an air conditioner,
When the receiving unit 53 receives the operation mode, the set room temperature, and the like, the instruction signal is output from the microcomputer 51 to the I / F 52, converted into an electric signal of a predetermined level, and output to the electric circuit board 33. This electric signal (operation mode, set room temperature)
The noise is removed by the noise removal circuit of the circuit board 33, and the interface circuit converts the noise into an electric signal that can be received by the microcomputer. Then, these commands (operation mode, set room temperature) are stored in a predetermined area of the memory 31 by the control unit 30. The control unit 30 controls the refrigerant circuit 1 based on the command (operation mode, set room temperature) and a program stored in the memory 31 and outputs a drive signal to the drive circuit 2. Specifically, the control unit 30 switches the four-way switching valve 12 and adjusts the valve of the pressure reducer 14 to a predetermined opening. In addition, the compressor 11 of the refrigerant circuit 1 is driven by converting the power input from the commercial power supply 20 to the drive circuit 2 via the electric circuit board 33 into a power signal of a predetermined frequency.

Hereinafter, the flow of the refrigerant in the refrigerant circuit 1 during cooling and during heating will be described with reference to FIG. During the cooling operation, the four-way switching valve 12 is set to the position indicated by the solid line,
4 is reduced to a predetermined opening, and the compressor 11 is started. The high-pressure refrigerant discharged from the compressor 11 is condensed in the outdoor heat exchanger 13 and then decompressed by the decompressor 14. After the decompressed low-pressure refrigerant evaporates in the indoor heat exchanger 15, the four-way switching valve 1
2. Return to the compressor 11 via the accumulator 16. When the refrigerant evaporates in the indoor heat exchanger 15, the indoor air deprives the refrigerant of heat, and the deprived indoor air acts as cool air.

At the time of the heating operation, the four-way switching valve 12 is set to the position indicated by the dotted line, and the pressure reducer 14 is throttled to a predetermined opening.
Start The high-pressure refrigerant discharged from the compressor 11 is condensed in the indoor heat exchanger 15 and then decompressed by the decompressor 14. The decompressed low-pressure refrigerant evaporates in the outdoor heat exchanger 13 and returns to the discharge side of the compressor 11 via the four-way switching valve 12 and the accumulator 16. When the refrigerant is condensed in the indoor heat exchanger 15, heat is released to the room air, and the room air that has absorbed this heat acts as warm air.

[Electric Circuit Board] Hereinafter, the specific configuration and arrangement of the outdoor unit 40 and the indoor unit 50 of the air conditioner according to the present embodiment will be described, and then the electric circuit board 33 will be described in detail.

FIG. 5 is a perspective view of the outdoor unit 40 and the indoor unit 50 of the air conditioner according to the present embodiment. FIG. 6 is a perspective view of the inside of the outdoor unit 40. The outdoor unit 40 is installed outdoors with the rear surface facing the building, and the outdoor heat exchanger 13 removes outside air sucked from the rear surface by a propeller fan (not shown).
And discharged from the front. The indoor unit 50 brings the indoor air sucked from above into contact with the indoor heat exchanger 15,
The air is supplied into the room from the outlet by a cross flow fan (not shown).

The indoor unit 50 includes the indoor heat exchanger 1 described above.
5. The indoor unit microcomputer 51, the I / F 52, the receiving unit 53, and the sensor 54 are provided inside the main body casing 55. As shown in FIG. 5, the outdoor unit 40 includes a main body casing 41 and a closing valve cover 42. The closing valve cover 42 is provided on the inner wall side with the protruding portion 4 through which the electric cable 48 is conducted.
2a. Further, as shown in FIG. 6, the interior is provided with an outdoor heat exchanger 13, a machine room 43, and an electrical box 44.

In the machine room 43, a compressor 11, a four-way switching valve 12, a pressure reducer 14, and an accumulator 16 are provided. These compressor 11, four-way switching valve 12, pressure reducer 1
The accumulator 4, the accumulator 16 and the outdoor heat exchanger 13 are connected by refrigerant pipes as shown in FIG. 2, respectively, and further connected to the indoor heat exchanger 15 by pipes 46 and 47 to form the refrigerant circuit 1.

The electrical box 44 is a substantially rectangular box-like member as shown in FIG. The control section 3 is provided on the component mounting surface on the control board 45.
0, a memory 31, a sensor 32, and electronic components constituting the drive circuit 2 are mounted. The output of the control plate 45 is connected to the compressor 11, the four-way switching valve 12, and the pressure reducer 14. As described above, the output of the drive circuit 2 is connected to the compressor 11, and the control unit 30 is connected to the four-way switching valve 12 and the pressure reducer 14. The electric circuit board 33 is vertically arranged alongside one end of the control board 45, and is electrically connected to the control unit 30 on the control board 45 and the input side of the drive circuit 2. In addition, the commercial power supply 20 is connected via the electric cable 48.
And the indoor unit 50 (I / F52). The electric circuit board 33 is a device in which a three-dimensional pattern of conductor wiring of a thin metal plate is formed, and the conductor wiring is solidified with an insulating resin. The electric circuit board 33 has a substantially rectangular parallelepiped shape as shown in FIG.

FIG. 7 is an enlarged view of a surface of the electric circuit board 33 facing the control plate 45 (hereinafter referred to as a back surface). FIG. 7 is an enlarged view of a surface of the electric circuit board 33 not facing the control plate 45 (hereinafter referred to as a front surface). FIG.

As shown in FIG. 8, the electric cable 4 from the commercial power source 20 and the indoor unit 50
A terminal block 63 composed of a terminal portion 63a to which 8 is connected is formed. Each of the terminal portions 63a is a terminal plate 63 made of a conductive metal connected to the conductor wiring inside the circuit board 33.
b, a mounting hole 63c provided in the terminal plate 63b, and a screw 63d screwed into the mounting hole 63c. These terminal plate 63b, mounting hole 63c, and screw 63d are electrically connected to the electronic components on the back surface.

As shown in FIG. 7, the surface of the circuit board 33 facing the control plate 45 is a component mounting surface on which a large number of electronic components are mounted. Here, a state before component mounting is shown for convenience of explanation. On the mounting surface here, a harness 62 electrically connected to the control unit 30 and connection holes 61a and 61b electrically connected to the drive circuit 2 are provided. The harness 62 and the connection holes 61a and 61b are connected to conductor patterns on the control plate 45 via cables, and the electric circuit board 33 and the control plate 45 are electrically connected.

Electronic components constituting a noise elimination circuit and an internal / external transmission circuit as shown in the electrical connection diagram of FIG. 9 are mounted on the component mounting surface of the electric circuit board 33. The noise removal circuit has capacitors C1 to C6 and a common mode choke L1, removes noise from the power supplied from the commercial power supply 20, outputs the noise to the connection holes 61a and 61b, and
5 is not emitted to the commercial power supply 20.
The internal / external transmission circuit converts the signal supplied from the indoor unit 50 into a signal (low-voltage signal) that can be received by the control board 45 in the integrated circuit HIC5, and outputs the signal to the harness 62. The internal / external transmission circuit also converts a signal input to the harness 62 from the control board 45 into a signal (high-voltage signal) that can be received by the indoor unit 50 in the HIC 5 and outputs the signal to the indoor unit 50. Specifically, a voltage of 5 V supplied to the control plate 45 is output to the pin 62a, the ground line of the control plate 45 is connected to the pin 62b, and the integrated circuit HI is connected to the pin 62c.
A signal from C5 to the control board 45 is input, and a signal from the control board 45 to the integrated circuit HIC5 is input to the pin 62d.

According to the electric circuit board 33 of this embodiment, since the conductor wiring formed of a thin metal plate is insulated by the resin member, the current capacity of the conductor wiring is large and the insulation distance between the conductor wirings is short. In order to mount a noise elimination circuit and an internal / external transmission circuit to which a high voltage and a large current are input on the electric circuit board 33,
These circuits can be implemented in a small space.
As a result, the area of the control plate 45 can be reduced without increasing the size of the electrical box 44.

Since the control unit 30 on the control board 45 and the noise removal circuit are physically separated from each other, the control unit 3
It is possible to prevent noise from being mixed into the signal input to 0.

[0031]

According to the electric circuit board of the first aspect, the conductor wiring of the electric circuit board is formed of a thin metal plate and is insulated by the resin member, so that the current capacity is large and the insulation distance is short. Therefore, the noise elimination circuit and the internal / external transmission circuit to which a high voltage and a large current are input can be mounted in a small space. Thereby, the area of the control plate can be reduced without increasing the size of the electrical components. Further, since the microcomputer on the control board and the noise elimination circuit are physically separated from each other, it is possible to prevent noise from being mixed in a signal input to the microcomputer.

According to the air conditioner of the second aspect, the same operation and effect as those of the electric circuit board of the first aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 shows the refrigerant circuit.

FIG. 3 is a drive circuit thereof.

FIG. 4 is a control circuit thereof.

FIG. 5 is a perspective view of an air conditioner according to an embodiment of the present invention.

FIG. 6 is the inside of the outdoor unit.

FIG. 7 is a component mounting surface of the circuit board.

FIG. 8 is a terminal connection surface of the circuit board.

FIG. 9 is an electronic circuit mounted on a circuit board 33;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant circuit 33 Electric circuit board 40 Outdoor unit 45 Control plate 46, 47 Refrigerant piping 50 Indoor unit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinji Ehira 1000-2 Oya, Okamotocho, Kusatsu-shi, Shiga F-term (reference) in Daikin Industries, Ltd. Shiga Works 3L061 BA03 BA07 5E338 AA01 AA16 BB75 BB80 CC01 EE13

Claims (2)

[Claims] 1. An electric circuit board provided in an air conditioner having an indoor unit and an outdoor unit, for electrically connecting a control plate for controlling operation of the air conditioner to the indoor unit and a commercial power supply, A control board, a conductor wiring of a thin metal plate electrically connectable to an indoor unit and a commercial power supply, and electrically connected to the control board and the commercial power supply via the conductor wiring to enter or control the control board A noise removal circuit that removes noise emitted from the board, and is electrically connected to the control board and the indoor unit through the conductor wiring, converts a signal from the indoor unit and outputs the signal to the control board, and An internal / external transmission circuit that converts a signal from the control board and outputs the signal to the indoor unit; and a hole that is integrally formed with the conductor wiring and electrically connects the conductor wiring to the noise removal circuit and the internal / external transmission circuit. Where the resin is formed A circuit board comprising: 2. An indoor unit for exchanging heat between indoor air and a refrigerant to supply cool air or warm air to a room, a refrigerant pipe having one end connected to the indoor unit and capable of flowing a refrigerant, And an outdoor unit connected to the other end of the indoor unit and configured to form a refrigerant circuit with the indoor unit and the refrigerant pipe, and to supply the compressed or decompressed refrigerant to the indoor unit via the refrigerant pipe, and the refrigerant circuit. An air conditioner comprising: a control board; and the electric circuit board according to claim 1 electrically connected to the control board, an indoor unit, and a commercial power supply.