Control panel of indoor unit, electric control box and indoor unit

Abstract

The utility model discloses a control panel of an indoor unit, an electric control box and the indoor unit, the control panel of the indoor unit is provided with a strong current plate and a weak current plate based on strong and weak current separation, a motor driving chip, a first terminal of an indoor fan motor and a second terminal of a fresh air system motor are integrated on one side of the strong current plate, and a main control chip is integrated on one side of the weak current plate; the strong current plate and the weak current plate are connected through a communication cable, the motor driving chip is responsible for driving an indoor fan motor and a fresh air system motor, the weak current plate only needs to send a control signal to the motor driving chip through the communication cable, and then the motor driving chip can control the indoor fan motor and the fresh air system motor. Compared with an existing scheme that a control cable needs to be independently arranged on a main control chip to be connected to a strong current plate to control a fresh air system motor, the connecting cables between the weak current plate and the strong current plate can be reduced, wiring between the plates can be simplified, and the assembly and maintenance efficiency of the electric control box can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuits, and in particular to a control panel of an indoor unit, an electric control box and the indoor unit. BACKGROUND

[0002] At present, indoor wall-mounted air conditioners are developing in the direction of miniaturization, and the machine body usually needs to accommodate a fresh air system, an electric control box and an indoor fan motor. The electric control box is provided with two circuit boards, a strong current board and a weak current board. The strong current board is responsible for connecting the strong current equipment such as the fresh air system motor, the indoor fan motor and the outdoor power supply relay. The weak current board is responsible for bearing the main control chip and components of the electric control part.

[0003] Generally speaking, in addition to the connection of the two communication cables between the weak current board and the strong current board, the main control chip of the weak current board also controls the connection of the fresh air system motor of the strong current board through two cables, the outdoor power supply relay of the strong current board through one cable, the electric auxiliary heating function relay of the strong current board through one cable, and so on. This makes the connection line between the weak current board and the strong current board more, the wiring complex, not conducive to assembly and maintenance, and the electromagnetic interference between the cables also needs to be considered. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a control panel of an indoor unit, an electric control box and the indoor unit, which can reduce the connection line between the weak current board and the strong current board, simplify the wiring and improve the assembly and maintenance efficiency.

[0005] In a first aspect, the embodiments of the present application provide a control panel of an indoor unit, comprising:

[0006] a strong current board, comprising a motor drive chip, a first terminal for connecting an indoor fan motor and a second terminal for connecting a fresh air system motor, the motor drive chip being connected to the first terminal through a first group of drive pins and connected to the second terminal through a second group of drive pins;

[0007] a weak current board, comprising a main control chip;

[0008] The strong current board and the weak current board are connected through a communication cable, one end of the communication cable being coupled to a communication pin of the motor drive chip and the other end being coupled to a communication pin of the main control chip.

[0009] In some embodiments, the strong current board further comprises an outdoor power supply relay and / or an electric auxiliary heating function relay, the motor drive chip being connected to a control end of the outdoor power supply relay through a first control pin and connected to a control end of the electric auxiliary heating function relay through a second control pin.

[0010] In some embodiments, the first control pin and the second control pin are both level signal output pins.

[0011] In some embodiments, the strong-current board further comprises a first communication socket, the weak-current board further comprises a second communication socket, one end of the communication cable is connected to the communication pins of the motor drive chip through the first communication socket, and the other end of the communication cable is connected to the communication pins of the master control chip through the second communication socket.

[0012] In some embodiments, the master control chip and the motor drive chip each comprise two communication pins, the first communication socket and the second communication socket each comprise two connection contacts, and the number of the communication cables is 2; the communication pins of the motor drive chip are connected to the connection contacts of the first communication socket one by one, the communication pins of the master control chip are connected to the connection contacts of the second communication socket one by one, and the two connection contacts of the first communication socket and the two connection contacts of the second communication socket are connected through the communication cables, respectively.

[0013] In some embodiments, the first communication socket is arranged close to the edge of the strong-current board, and the second communication socket is arranged close to the edge of the weak-current board.

[0014] In some embodiments, the first group of drive pins comprises two H-bridge output pins, which are connected to the two connection contacts of the first terminal one by one; and the second group of drive pins comprises two H-bridge output pins, which are connected to the two connection contacts of the second terminal one by one.

[0015] In a second aspect, the embodiments of the present application further provide an electric control box for mounting the control board of the first aspect.

[0016] In some embodiments, the electric control box comprises a first mounting portion and a second mounting portion, the first mounting portion is used for accommodating the strong-current board, the second mounting portion is used for accommodating the weak-current board, and a wire routing position of the communication cable is arranged between the first mounting portion and the second mounting portion.

[0017] In a third aspect, the embodiments of the present application further provide an indoor unit comprising the control board of the first aspect and the electric control box of the second aspect.

[0018] The control panel, the electric control box and the indoor unit of the indoor unit have at least the following beneficial effects: the control panel of the indoor unit is based on the strong and weak electricity separation to set the strong electricity panel and the weak electricity panel, the strong electricity panel side integrates the motor drive chip, the first terminal of the indoor fan motor and the second terminal of the new air system motor, the weak electricity panel side integrates the main control chip, the strong electricity panel and the weak electricity panel are connected through the communication cable, wherein the motor drive chip is responsible for the driving of the indoor fan motor and the new air system motor, the weak electricity panel only needs to send the control signal to the motor drive chip through the communication cable, and the indoor fan motor and the new air system motor can be controlled by the motor drive chip. Compared with the scheme that the main control chip needs to be independently arranged to control the new air system motor through the control cable of the strong electricity panel, the connection cable between the weak electricity panel and the strong electricity panel of the embodiment of the application can be reduced, the wiring between the panels is simplified, and the assembly and maintenance efficiency of the electric control box is improved.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the specification and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the internal structure schematic diagram of the indoor wall-mounted air conditioner provided by the embodiment of the application;

[0021] Figure 2 is the structure schematic diagram of the electric control box provided by the embodiment of the application;

[0022] Figure 3 is the front view of the electric control box after the strong electricity panel and the weak electricity panel are installed;

[0023] Figure 4 is the side view of the electric control box after the strong electricity panel and the weak electricity panel are installed;

[0024] Figure 5 is the communication control connection schematic diagram of the strong electricity panel and the weak electricity panel under the related art;

[0025] Figure 6 is the communication control connection schematic diagram of the strong electricity panel and the weak electricity panel provided by the embodiment of the application.

[0026] Corresponding reference signs:

[0027] The strong electricity panel 100, the weak electricity panel 200, the electric control box 300, the first mounting portion 310, the second mounting portion 320, the wiring position 330. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially changed or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for the purpose of clearly describing a certain embodiment and do not mean that the sequence is necessary, unless otherwise stated that a certain sequence must be followed.

[0029] In the description of the present application, one or more is the meaning of one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used to distinguish the technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified.

[0031] The indoor wall-mounted air conditioner usually comprises an evaporator, a motor, a fresh air system and an electric control box. In order to reduce the size of the indoor wall-mounted air conditioner in the length direction, the motor, the fresh air system and the electric control box are centrally arranged at the right side position of the indoor wall-mounted air conditioner. Therefore, the size of the electric control box is limited, which increases the assembly difficulty of the control board in the electric control box. In order to realize the separation of strong and weak electricity, the control board is generally composed of two plates of strong and weak electric plates at present. The strong electric plate is responsible for the strong electric circuit part, and connects the direct current motor of the fresh air system, the direct current motor of the indoor fan and the three-phase alternating current input, etc. The weak electric plate is responsible for the weak electric circuit part, and carries the main control chip, connects the sensor, the display assembly, the communication of the strong electric plate, etc. In addition to the communication cable, there are also multiple connection lines between the strong and weak electric plates, which are used for the weak electric plate to send control signals to the driving chip, relay, etc. on the strong electric plate to act. In addition, the weak electric plate itself also has a large number of sockets for connecting weak electric equipment. Therefore, when assembling the electric control box, the assembler needs to connect a large number of cables, and the problem of electromagnetic interference between the cables is also easy to occur. The wiring in the electric control box is not easy to adjust in the later maintenance.

[0032] Based on this, this application provides a control board, electrical control box, and indoor unit for an indoor unit. The control board of the indoor unit is based on the separation of strong and weak current circuits, with a strong current board and a weak current board. One side of the strong current board integrates a motor driver chip, a first terminal of the indoor fan motor, and a second terminal of the fresh air system motor. The other side of the weak current board integrates a main control chip. The strong current board and the weak current board are connected by a communication cable. The motor driver chip is responsible for driving the indoor fan motor and the fresh air system motor. The weak current board only needs to send control signals to the motor driver chip through the communication cable, and the motor driver chip can control the indoor fan motor and the fresh air system motor. Compared with the current solution where the main control chip needs to be independently connected to the strong current board to control the fresh air system motor, the connection cable between the weak current board and the strong current board in this application embodiment can be reduced, simplifying the wiring between the boards and improving the assembly and maintenance efficiency of the electrical control box.

[0033] The control board, electrical control box, and indoor unit of the indoor unit are described below with reference to the accompanying drawings:

[0034] Reference Figure 1 The diagram shows the internal structure of an indoor wall-mounted air conditioner. The evaporator and cross-flow fan body are located on the left side. Figure 1 (Represented by number 1), the right side houses the DC motor of the cross-flow fan, the DC motor of the fresh air system, and the duct assembly, etc. Figure 1 (represented by number 2) and the electrical control box ( Figure 1 (represented by reference numeral 3), the general structure of the electrical control box 300 is as follows: Figure 2 As shown, the upper part of the electrical control box 300 has a deep structure and is provided with a first mounting part 310 for mounting the high-voltage board 100. This is to accommodate tall components such as electrolytic capacitors on the high-voltage board 100. The lower part of the electrical control box 300 is a second mounting part 320 for mounting the low-voltage board 200. This is used to fix the low-voltage board 200 so that its front faces the assembly personnel, allowing the assembly personnel to connect various cables and cables between the high-voltage board 100 and the low-voltage board 200 from the front of the low-voltage board 200. (Refer to...) Figure 3 The diagram shown is a front view of the electrical control box 300 with the high-voltage board 100 and the low-voltage board 200 assembled. (Refer to...) Figure 4 The diagram shows the side structure of the electrical control box 300 with the high-voltage board 100 and the low-voltage board 200 assembled. The low-voltage board 200 is fixed to the second mounting part 320 of the electrical control box 300, with the front of the low-voltage board 200 facing the paper for easy wiring. The high-voltage board 100 is fixed to the first mounting part 310 of the electrical control box 300, with the side of the high-voltage board 100 facing the paper to accommodate the long high-voltage board 100 and the lateral dimensions of the indoor wall-mounted air conditioner.

[0035] The control board provided in this embodiment includes:

[0036] The strong current board 100 includes a motor driving chip, a first terminal for connecting the indoor fan motor, and a second terminal for connecting the fresh air system motor. The motor driving chip is connected to the first terminal through a first group of driving pins and connected to the second terminal through a second group of driving pins.

[0037] The weak current board 200 includes a master control chip.

[0038] The strong current board 100 and the weak current board 200 are connected through a communication cable. One end of the communication cable is coupled to a communication pin of the motor driving chip, and the other end is coupled to a communication pin of the master control chip.

[0039] The strong current board 100 and the weak current board 200 are connected through a communication cable. The master control chip sends control signals to the motor driving chip through the communication cable to control the indoor fan motor and the fresh air system motor connected to the strong current board 100 through the motor driving chip. Therefore, the motor driving chip needs to include driving pins corresponding to the indoor fan motor and driving pins corresponding to the fresh air system motor.

[0040] Generally, the indoor fan motor and the fresh air system motor are both DC motors. The motor driving chip usually has two pins in a group to drive the motor, which corresponds to the two voltage outputs of the H-bridge in the driving chip. In some embodiments, the first group of driving pins includes two H-bridge output pins, which are connected one by one to the two connection contacts of the first terminal; the second group of driving pins includes two H-bridge output pins, which are connected one by one to the two connection contacts of the second terminal.

[0041] The motor driving chip of the present application has two groups of driving pins, one group connected to the first terminal for connecting the indoor fan motor, and the other group connected to the second terminal for connecting the fresh air system motor. Therefore, the motor driving chip has two H-bridge outputs inside. The master control chip sends signals to the motor driving chip through its own electronic control program. When the indoor fan motor is controlled separately, the master control chip sends the control signal of the indoor fan motor to the motor driving chip through the communication cable, which is recognized by the motor driving chip to control the indoor fan motor. When the fresh air system motor is controlled separately, the master control chip sends the control signal of the indoor fan motor to the motor driving chip through the communication cable, which is recognized by the motor driving chip to control the fresh air system motor. When the indoor fan motor and the fresh air system motor are controlled simultaneously, the master control chip sends control signals in a time-division manner through the communication cable, giving control instructions corresponding to the indoor fan motor and the fresh air system motor in turn, instructing the motor driving chip to output through the two groups of driving pins in turn. Of course, the above-mentioned method of sending control signals is only an example. For a motor driving chip with two H-bridge outputs, different master control chips can be matched to realize the simultaneous control of two motors, which are not listed here.

[0042] It can be understood that the number of communication cables is determined according to the application communication protocol; the first terminal and the second terminal can be provided by a socket, a quick connector, a terminal post or the like, or can be provided by a PCB board and directly welded to the cable of the corresponding motor.

[0043] In some embodiments, the strong current board 100 further comprises an outdoor power supply relay and / or an electric auxiliary heating function relay, and the motor drive chip is connected to the control end of the outdoor power supply relay through the first control pin, and is connected to the control end of the electric auxiliary heating function relay through the second control pin.

[0044] As can be seen from the foregoing description, the strong current board 100 carries the relay and the like in addition to the first terminal corresponding to the indoor fan motor and the second terminal corresponding to the fresh air system motor. The relays carried by the strong current board 100 in this embodiment include an outdoor power supply relay and / or an electric auxiliary heating function relay, both of which are in a strong current working environment and are switched based on weak current. The traditional strong and weak current board 200 separation scheme draws control pins from the main control chip of the weak current board 200, connects to the strong current board 100 and indirectly controls the switching of the relay through an optical coupler and the like isolation component. The object connected by the main control chip in this embodiment becomes the motor drive chip. After receiving the control instruction corresponding to the switching signal from the main control chip, the motor drive chip identifies the control instruction and sends the switching signal to the corresponding relay. Obviously, in this circuit form, the optical coupler and the like isolation component can be omitted, and the circuit layout is simplified.

[0045] It can be understood that the first control pin can control the outdoor power supply relay through the level signal, and the second control pin can control the electric auxiliary heating function relay through the level signal.

[0046] In some embodiments, the strong current board 100 further comprises a first communication socket, and the weak current board 200 further comprises a second communication socket. One end of the communication cable is connected to the communication pin of the motor drive chip through the first communication socket, and the other end is connected to the communication pin of the main control chip through the second communication socket.

[0047] The strong current board 100 and the weak current board 200 are connected by the communication socket to connect the communication cable, which is convenient for assembly personnel to connect the cable. The first communication socket is welded or clamped to the circuit hole of the strong current board 100 in the form of a component, and the circuit hole corresponding to the first communication socket is connected to the circuit hole corresponding to the communication pin of the motor drive chip through the in-board wiring. Similarly, the second communication socket is welded or clamped to the circuit hole of the weak current board 200 in the form of a component, and the circuit hole corresponding to the second communication socket is connected to the circuit hole corresponding to the communication pin of the main control chip through the in-board wiring.

[0048] Specifically, the main control chip and the motor drive chip each include two communication pins, the first communication socket and the second communication socket each include two connection contacts, and the number of communication cables is 2; the communication pins of the motor drive chip are connected one-to-one with the connection contacts of the first communication socket, the communication pins of the main control chip are connected one-to-one with the connection contacts of the second communication socket, and the two connection contacts of the first communication socket and the two connection contacts of the second communication socket are connected by communication cables respectively.

[0049] The communication protocol in this embodiment uses two communication cables. Correspondingly, the main control chip and the motor drive chip both use two communication pins, and the circuit holes corresponding to the first communication socket and the second communication socket are also two.

[0050] In some embodiments, the first communication socket is located near the edge of the high-voltage board 100, and the second communication socket is located near the edge of the low-voltage board 200. To minimize the length of the communication cable, the above considerations are taken into account. Figure 3 The structure of the electrical control box 300 allows the first communication socket of the high-voltage board 100 to be placed on the edge of the high-voltage board 100, which is close to the installation position of the low-voltage board 200, and the second communication socket of the low-voltage board 200 to be placed on the edge of the low-voltage board 200, which is close to the installation position of the high-voltage board 100. This can shorten the wiring distance and also make it easier for the electrical control box 300 to fix the communication cable through its own structure.

[0051] Specifically, refer to Figure 5 The diagram shows an example of the connection lines between the high-voltage board 100 and the low-voltage board 200 when the high-voltage and low-voltage boards 200 are currently separated. Six connection lines are installed between the high-voltage board 100 and the low-voltage board 200. Besides the two communication cables connecting the low-voltage board 200 and the high-voltage board 100, the main control chip of the low-voltage board 200 also controls the fresh air system motor connected to the high-voltage board 100 via two cables, the outdoor power supply relay of the high-voltage board 100 via one cable, and the electric auxiliary heating function relay of the high-voltage board 100 via one cable. (Refer to...) Figure 6 The illustration shown corresponds to an embodiment of this application. Figure 5 In the improved embodiment, the connection between the high-voltage board 100 and the low-voltage board 200 consists of only two communication cables. The indoor fan motor, the fresh air system motor, the outdoor power supply relay, and the electric auxiliary heating function relay are controlled by the motor driver chip on the high-voltage board 100. Therefore, compared to... Figure 5 With four fewer cables, spatial radiation interference from the load is reduced, resulting in better overall electromagnetic interference control.

[0052] This application embodiment also provides an electrical control box 300 for mounting the above-mentioned control board.

[0053] Reference Figure 3 and Figure 4As shown, the upper part of the electric control box 300 is a longitudinal structure, provided with a first mounting part 310 for mounting the strong current board 100, and the lower part is a flat structure, provided with a second mounting part 320 for mounting the weak current board 200; when mounting the strong current board 100, the strong current board 100 is mounted in the longitudinal structure of the upper part, and when mounting the weak current board 200, the weak current board 200 is mounted in the flat structure of the lower part. The strong current board 100 and the weak current board 200 are perpendicular to each other, and a wiring position 330 is arranged between the first mounting part 310 and the second mounting part 320. The wiring position 330 can be a narrow slot structure, which facilitates the restriction of the communication cable in the wiring position 330. The wiring position 330 can also be a buckle type, which can loosen or lock the communication cable through a switch buckle.

[0054] The embodiment of the present application also provides an indoor unit, which comprises the control board of any of the above embodiments and the electric control box 300 of any of the above embodiments. The control board of the indoor unit is provided with the strong current board 100 and the weak current board 200 based on the separation of strong and weak currents. The strong current board 100 is integrated with a motor drive chip, a first terminal of an indoor fan motor and a second terminal of a fresh air system motor on one side. The weak current board 200 is integrated with a main control chip on one side. The strong current board 100 and the weak current board 200 are connected through a communication cable. The motor drive chip is responsible for the driving of the indoor fan motor and the fresh air system motor. The weak current board 200 only needs to send a control signal to the motor drive chip through the communication cable, so that the indoor fan motor and the fresh air system motor can be controlled by the motor drive chip. Compared with the current scheme in which the main control chip needs to be independently provided with a control cable connected to the strong current board 100 to control the fresh air system motor, the connection cable between the weak current board 200 and the strong current board 100 of the embodiment of the present application can be reduced, the wiring between the boards is simplified, and the assembly and maintenance efficiency of the electric control box 300 is improved.

[0055] It should be understood that in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, "A and / or B" can mean that there are three cases of only A, only B and A and B at the same time, and A and B can be singular or plural. The character " / " generally represents that the front and rear associated objects are in an "or" relationship. "At least one of the following" or similar expressions means any combination of these items, including single item or any combination of multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0056] In several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method can be implemented in other manners. For example, the apparatus embodiments described above are merely schematic, and the division of units is merely a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, or the among different units, can be indirect couplings or communication connections through some interfaces, apparatuses or units, and can be in electrical, mechanical or other forms.

[0057] It should also be understood that the various embodiments provided by the embodiments of the present application can be combined in any manner to achieve different technical effects.

[0058] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A control board of an indoor unit, characterized by, The control board comprises: a strong current board comprising a motor driving chip, a first terminal for connecting a motor of an indoor fan, and a second terminal for connecting a motor of a fresh air system, the motor driving chip being connected to the first terminal through a first group of driving pins and connected to the second terminal through a second group of driving pins; a weak current board comprising a master control chip; wherein the strong current board and the weak current board are connected through a communication cable, one end of the communication cable being coupled to a communication pin of the motor driving chip and the other end being coupled to a communication pin of the master control chip.

2. The control panel of claim 1, wherein, The strong current board further comprises an outdoor power supply relay and / or an electric auxiliary heating function relay, the motor driving chip being connected to a control terminal of the outdoor power supply relay through a first control pin and connected to a control terminal of the electric auxiliary heating function relay through a second control pin.

3. The control panel of claim 2, wherein, The first control pin and the second control pin are both level signal output pins.

4. The control panel of claim 1, wherein, The strong current board further comprises a first communication socket, and the weak current board further comprises a second communication socket, one end of the communication cable being connected to the communication pin of the motor driving chip through the first communication socket and the other end being connected to the communication pin of the master control chip through the second communication socket.

5. The control panel of claim 4, wherein, The master control chip and the motor driving chip each comprise two communication pins, the first communication socket and the second communication socket each comprise two connection contacts, and the number of the communication cables is two; the communication pins of the motor driving chip are connected to the connection contacts of the first communication socket one by one, the communication pins of the master control chip are connected to the connection contacts of the second communication socket one by one, and the two connection contacts of the first communication socket and the two connection contacts of the second communication socket are connected through the communication cables respectively.

6. The control panel of claim 4, wherein, The first communication socket is arranged close to an edge of the strong current board, and the second communication socket is arranged close to an edge of the weak current board.

7. The control panel of claim 1, wherein, The first group of driving pins comprises two H-bridge output pins connected to the two connection contacts of the first terminal one by one, and the second group of driving pins comprises two H-bridge output pins connected to the two connection contacts of the second terminal one by one.

8. An electric control box characterized by comprising: The electric control box comprises a first mounting portion for accommodating the strong current board and a second mounting portion for accommodating the weak current board, and a wire routing position of the communication cable is arranged between the first mounting portion and the second mounting portion.

9. The electric control box according to claim 8, wherein The control system comprises the control board according to any one of claims 1 to 7 and the electric control box according to any one of claims 8 to 9.

10. An indoor unit, characterized by comprising: ​

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