JPH037843A - Indoor device of air conditioner - Google Patents

Abstract

PURPOSE:To provide an effective utilization of a printed circuit board and a small-sized printed circuit board as well by a method wherein relays of less number than that of output terminals of a relay driver circuit are arranged side-by-side on the printed circuit board from one end side of a group of the output terminals of the relay driver circuit and an input terminal of each of the relays is connected to a required output terminal with a lead wire. CONSTITUTION:Driving relays 13 to 17 of less number than that of relay driver output terminals A to F of a base driver circuit 12 are arranged side-by-side on a control printed circuit board 6 from one side of the relay driver output terminals A to F. An indoor fan motor relay 13 is connected to a terminal A, an air direction changing-over louver relay 14 is connected to a terminal B, a four-way valve changing-over valve relay 15 is connected to a terminal D, a compressor relay 16 is connected to a terminal E and an outdoor fan motor relay 17 is connected to a terminal F through a lead line 18, respectively. An operation switch 4, a room temperature sensor 7, an A/D converter circuit 8 and a DC power supply circuit 10 are connected to an input terminal of a micro-computer 11 and an input terminal of a base driver circuit 12 is connected to an output terminal of the micro-computer 11.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to an indoor unit of an air conditioner, and particularly relates to an indoor unit of an air conditioner, and in particular, a device in which a microcomputer, a relay drive circuit, and a plurality of relays are arranged on a printed circuit board. This invention relates to an indoor unit having an indoor control circuit.

(Prior Art) In a conventional air conditioner, as shown in FIG.
By soldering the pond control electronic components, they are connected using the copper foil of the printed circuit board, and the indoor fan motor and other element components are controlled. In the example shown in Fig. 5, the indoor fan motor relay d1m direction switching louver relay e, the drain pump motor relay f,
A four-way switching valve relay g, a pressure am relay h, and an outdoor fan motor relay l are soldered.

Each drive relay d%i is operated via a base drive circuit C by a microcomputer b which receives a setting signal from an operation switch j and a temperature sensed by a room temperature sensor. Among the contact outputs of relays d to i, the contact outputs of relays g to i are connected to the outdoor side through an indoor/outdoor connecting wire (not shown) to the four-way switching solenoid valve in the outdoor unit, the compressor motor, An outdoor fan motor is controlled. Further, on the indoor side, the indoor fan motor, the wind direction switching louver motor, and the drainage pump motor are controlled by the contact output from relay d~.

(Problem to be solved by the invention) However, in the indoor unit of the conventional air conditioner,
Control circuit base drive circuit C and each drive relay d~
Since the connection with i is made by the copper foil of the printed circuit board, there are the following problems.

(1) There are different types of air conditioners, such as floor-standing types and ceiling-embedded types, and the types of relays that are required or desired to be used differ depending on the type. For example, the types of relays that are not used differ, such as the floor-standing type having a louver motor attached but not requiring a drain pump, while the ceiling-mounted type does not require a louver motor but requires a drain pump. Therefore, in the past, it was necessary to create a dedicated printed circuit board, resulting in high costs.

On the other hand, it is preferable that the indoor unit control circuit be common to each model, such as floor-standing type and ceiling-embedded type, but if the indoor control circuit is made common to each model, it is necessary for all models. It is necessary to prepare a drive relay, which increases the area of the printed circuit board.

(2) Microcomputer b and base drive circuit C
Since the wiring pattern portion of the low voltage circuit of the electronic components such as the above and the wiring pattern portion of the high voltage (voltage applicable to electrical appliance standards) circuit of the drive relays d to i are adjacent to each other on the printed circuit board, the insulation pattern between the two is adjacent to each other on the printed circuit board. It is necessary to have a relatively large space between the two, which increases the area of the printed circuit board accordingly.

(3) As described in (2) above, since the pattern portions of the low voltage circuit and the high voltage circuit are adjacent to each other, malfunctions are likely to occur due to noise.

The purpose of the present invention was made in consideration of the above circumstances, and
Even if the types of relays required differ depending on the type of air conditioner, the same printed circuit board can be used effectively, and the air conditioner has an indoor control circuit that can be used at low cost and with high efficiency by making the printed circuit board smaller. Our goal is to provide indoor units.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention separately drives a fan motor, a wind direction switching louver motor, a drainage pump motor, and a compressor motor by relay on a printed circuit board. An indoor control circuit is constructed by arranging a relay drive circuit having at least an output terminal for the operation, a microcomputer for controlling the relay drive circuit, and a plurality of relays connected to each output terminal of the relay drive circuit. In the indoor unit of the air conditioner configured, a smaller number of relays than the output terminals of the relay driver circuit are arranged side by side on the printed circuit board from one end of the output terminal group of the relay driver circuit, and the input terminal of each of these relays is It has a configuration in which lead wires are connected to necessary output terminals among a group of output terminals provided in a relay driver circuit controlled by a computer.

(Function) The relays are arranged side by side on the printed circuit board from one end of the output terminal group of the relay driver circuit, and the number of relays is smaller than the number of output terminals of the relay driver circuit. Since the number of relays is smaller than the number of output terminals of the relay driver circuit, a free space is provided, and the area of the printed circuit board corresponding to this portion can be reduced.

In addition, the input (coil) terminal of each relay is connected to the necessary output terminal from among the output terminal group provided in the relay driver circuit controlled by the microcomputer, using lead wires instead of copper foil on the printed circuit board. . Therefore, even if the types of relays required differ depending on the model of the air conditioner, by simply changing the connection of the input terminal of each relay to the output terminal of the relay driver circuit on the same printed circuit board, it is possible to It is possible to construct an indoor control circuit that is compatible with the model of the harmonizer.

In this case, regarding the microcomputer as well, for the types of relays required for all the pre-scheduled models,
By preparing products with the necessary output functions as standard products, the same microcomputer chip can always be mounted on the printed circuit board and used as a control center, making it possible to standardize microcomputers. .

(Example) Hereinafter, the present invention will be explained based on illustrated embodiments.

In FIG. 4, 1 is an indoor unit of an air conditioner, and air inlet 2. Air outlet 3. Operation switch 4. Electrical parts box5. It is equipped with a control printed circuit board 6 and a room temperature sensor 7.

In FIG. 1, the part surrounded by the - dotted chain line is the part of the control printed circuit board 6 in the electrical component box 5, and
1 control circuit. The control printed circuit board 6 includes
Control electronic components such as an A/D conversion circuit 8 connected to a room temperature sensor 7, a DC power supply circuit 10 supplied with power from a power transformer 9, a microcomputer 11, and a base drive circuit 12 are mounted. This base drive circuit 1
2 has six relay driver output terminals A to F in this example. Furthermore, the control printed circuit board 6 includes relay driver output terminals A to F of the base drive circuit 12.
A smaller number of drive relays, in this example one fewer drive relays 13 to 17, are connected to the relay driver output terminal A.
-F are arranged and mounted from one side of the control printed circuit board 6 at the same pitch interval. Therefore, the area of the control printed circuit board 6 is reduced by one piece, as shown by diagonal lines in FIG.

In the case of the implementation example shown in FIG. 1, the drive relays 13 to 17 are indoor fan motor relay 13. Relay for wind direction switching louver 14. Four-way switching valve relay 15, compressor relay 1
6. There are a total of five relays 17 for the outdoor fan motor.

The input terminals (coil terminals) of these five driving relays 13 to 17 are five of the relay driver output terminals A to F.
They are placed on a printed circuit board facing each other and connected to each other. However, this connection is made through lead wires 18 rather than through the copper foil of the printed circuit board. That is,
Each input terminal of the relays 13 to 17 is connected to a necessary and appropriate one terminal of the relay driver output terminals A to F of the base drive circuit 12 in a one-to-one relationship by a lead wire 18.

In the case of the wiring example shown in Figure 1, indoor fan motor relay 13
is connected to the A terminal, the wind direction switching louver relay 14 is connected to the B terminal,
The four-way switching valve relay 15 is connected to the D@ terminal, the pressure tam relay 16 is connected to the E terminal, and the outdoor fan motor relay 17 is connected to the F terminal by lead wires 18, respectively.

The microcomputer 11 has an operation switch 4 at its input terminal. Room temperature sensor 7, A/D conversion circuit 8. The DC power supply circuit 10 also has a base drive circuit 1 at the output terminal.
2 input terminals are connected.

Based on the input signal from the operation switch 4 and the room temperature signal from the room temperature sensor 7, the microphone computer 11 controls the operation of the relays 13 to 17 via the base drive circuit 12 using a control function built into the microphone computer. . On the indoor side, the contacts of the relay 13 control the indoor fan motor, and the contacts of the relay 14 control the ON/OFF control of the wind direction switching louver motor. Also, for the outdoor side, relay 1
Each contact point 5 to 17 turns the refrigeration cycle's four-way solenoid valve, compressor motor, and outdoor fan motor in the outdoor unit ON/OFF via an indoor/outdoor crossover wire (not shown).
F controlled.

By the way, there are two types of air conditioners: floor-standing and ceiling-mounted.

There are different types, such as ceiling-embedded type and wall-mounted type, and the types of relays that are required or not used differ depending on the type.

Figure 3 shows the types of air conditioners and the types of relays required for each model in a table format.
An X mark means an unnecessary relay.

As shown in Figure 3, ``floor-standing type, ceiling-mounted type'' and ``wall-mounted type''
is equipped with a louver motor that can change the wind direction, but does not require a drainage pump, whereas the ``ceiling-mounted'' type does not require a louver motor that can change the wind direction, but requires a drainage pump. For this reason, if the conventional configuration is such that all printed circuit boards are connected using copper foil pattern circuits, it is necessary to create a printed circuit board with all six types of relays as shown in FIG.

In the mounting example shown in FIG. 1 above, according to the table shown in FIG. 3, the printed circuit board 6 has five
This applies when relays 13 to 17 of different types are mounted. If you want to install it in a ceiling-embedded type, as shown in Fig. 2, replace the wind direction switching louver relay 14 with a drain pump motor relay 19, and its input terminal is as follows.
Relay driver output terminals A to F of base drive circuit 12
Connect to the appropriate terminal C among the vacant terminals B and C.

As described above, the output terminals A to F of the base drive circuit 12
If the input terminals of the relays 13 to 17 and 19 are connected using lead wires instead of the copper foil of the printed circuit board 6, the following advantages can be obtained.

(1) When using a standard product based on the standard for a microcomputer, select and use one whose capacity of the soft input/output terminal in the microcomputer sufficiently satisfies the #J specifications of each relay to be controlled. A microcomputer can be shared by each AM. Therefore, the number of microcomputer chips produced and used increases, the unit cost decreases, and the indoor control circuit itself becomes cheaper.

(2) Since the printed circuit board only needs to be equipped with the minimum necessary number of relays, the area of the printed circuit board can be reduced, and the indoor control circuit can be made smaller and cheaper.

(3) Electronic control part including microphone computer is DC5
V and low voltage, whereas the relay circuit part! ,tA
Although the Cl source has a high voltage of 100V or 2oov, it is connected with lead wires instead of the copper foil of the printed circuit board.
This is advantageous in terms of insulation safety and in preventing malfunctions due to the influence of external noise, and reliability is improved.

In the above embodiment, the low voltage circuit section and the high voltage section were mounted on the same printed circuit board, but the printed circuit board was divided into two, the DC5V control section up to the base drive board, and the printed circuit board for the relay circuit section. By connecting them with lead wires, it is possible to further improve the degree of freedom and reliability of the structure.

[Effects of the Invention] As described above, according to the present invention, the number of relays smaller than the number of output terminals of the relay driver circuit on the printed circuit board is
Since the output terminals of the driver circuit are arranged side by side from one end side, free space is created on the other end of the printed circuit board, which allows the area and size of the printed circuit board to be reduced by that amount, which reduces printed circuit board costs. .

In addition, the input (coil) terminal of each relay is connected to the necessary output terminal among the output terminal group prepared in the relay driver circuit.
Since the connections are made with lead wires rather than copper foil on the printed circuit board, even if the type of relay required differs depending on the model of the air conditioner, simply connect the output terminals of the relay driver circuit to connect the input terminals of each relay. By only selectively changing it, an indoor control circuit suitable for the model of the air conditioner can be constructed. Therefore, the cost of the indoor control circuit can be reduced because the microcomputer can be shared and the same printed circuit board can be used effectively for each model.

In addition, noise is generated because the control circuit of electronic components that operate at low voltage and the relay circuit that uses a relatively high voltage ACq source are connected using lead wires.

Problems with insulation are eliminated, and reliability can be improved.

[Brief explanation of drawings]

1 and 2 show the configuration of an indoor control circuit for an air conditioner according to an embodiment of the present invention, and FIG. 1 shows a printed circuit board circuit 1i'l[2, Second
The figure is a circuit diagram of a printed circuit board with a drain pump motor relay, Figure 3 is a diagram showing the types of air conditioners and the types of required relays, and Figure 4 is an indoor unit of an air conditioner to which the present invention is applied. FIG. 5 is a printed circuit board circuit diagram showing the configuration of an indoor control circuit of a conventional air conditioner. In the figure, 1 is an air conditioner, 2 is an air inlet, 3 is an air outlet, 4 is an operation switch, 5 is an electrical parts box, 6 is a control printed circuit board, 7 is a room temperature sensor, and 8 is an A/D conversion 9 is a power transformer, 10 is a DC power supply circuit, 11 is a microcomputer, 12 is a base drive circuit (relay drive circuit), 13 is a relay for the indoor fan motor, 14 is a relay for the wind direction switching louver, and 15 is for the four-way switching valve. relay 16
17 is the relay for the compressor. 17 is the relay for the outdoor fan motor.
Reference numeral 18 indicates a connection lead wire, and reference numeral 19 indicates a relay for the drain bong motor.

Claims (1)

[Claims] 1. A relay drive circuit on a printed circuit board that has at least output terminals for individually driving a fan motor, a wind direction switching louver motor, a drainage pump motor, and a compressor motor by relay, and a microcomputer that controls the relay drive circuit; In an air conditioner indoor unit in which an indoor control circuit is configured by arranging multiple relays, one connected to each output terminal of the relay drive circuit, there are fewer relays than the output terminals of the relay driver circuit on the printed circuit board. A number of relays are arranged side by side from one end of the output terminal group of the relay driver circuit, and the input terminal of each of these relays is led to the necessary output terminal of the output terminal group prepared in the relay driver circuit controlled by the microcomputer. An indoor unit of an air conditioner characterized by being connected by a wire.