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

Abstract

The utility model discloses a control board of an indoor unit, an electric control box and the indoor unit, a strong current board of the control board comprises an electrolytic capacitor area used for assembling components such as a bus electrolytic capacitor, a radiator area used for assembling components which are large in heat productivity and need to be provided with a radiator, and a socket area used for being connected with a cable. The electrolytic capacitors with large heights are concentrated in the electrolytic capacitor area close to the first side edge, it is guaranteed that the electrolytic capacitors with large heights can be installed in the electric control box, the radiator area and the socket area are separated due to the fact that a plurality of radiators need to be arranged in the radiator area and the edges of the radiators need to be prevented from cutting and scalding cables, and therefore the radiator area and the socket area are not damaged. The socket area is located on the third side edge of the strong current board and is close to the cavity opening of the containing cavity of the electric control box after installation, so that assembly personnel can conveniently connect a cable to the strong current board, the routing of the cable connected with the strong current board in the electric control box is optimized, the problems that a radiator is cut and the cable is scalded are avoided, and the reliability of the electric control box is improved.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a control board, electrical control box and indoor unit for an indoor unit. Background Technology

[0002] Currently, indoor wall-mounted air conditioners are trending towards miniaturization, and the unit typically needs to house a fresh air system, an electrical control box, and an indoor fan motor. The electrical control box contains two circuit boards: a high-voltage board and a low-voltage board. The high-voltage board is responsible for connecting the fresh air system motor, the indoor fan motor, and the outdoor power supply relay, among other high-voltage equipment. The low-voltage board is responsible for housing the main control chip and components of the electrical control section.

[0003] The components on the power board, such as electrolytic capacitors, transformers, and heat sinks, are quite tall. Therefore, the control box has an inner cavity for installing the power board. In order to achieve miniaturization, the size of the inner cavity is limited. The cables connecting the power board are thick and numerous, resulting in dense wiring in the inner cavity. This can easily lead to problems such as the cables being cut by the heat sink, being burned, and electromagnetic interference between the cables. Utility Model Content

[0004] This application provides a control board, electrical control box, and indoor unit for an indoor unit, which can optimize the circuit layout of the power board, optimize the wiring layout of the electrical control box, and improve the reliability of the electrical control box.

[0005] In a first aspect, embodiments of this application provide a control board for an indoor unit, comprising:

[0006] The control board is used to install into the electrical control box of the indoor unit, and the electrical control box is provided with a receiving cavity;

[0007] The control board includes a power board, which includes an electrolytic capacitor area, a heat sink area, and a socket area. The electrolytic capacitor area is located at the edge of a first side of the power board, the heat sink area is located near a second side of the power board, and the socket area is located at the edge of a third side of the power board. The first side and the third side are opposite to each other. The power board is used to be mounted to the receiving cavity with the first side facing the bottom of the receiving cavity, so that the third side is close to the opening of the receiving cavity.

[0008] In some embodiments, the power supply board further includes an indoor fan drive circuit, which includes an indoor fan motor socket and an indoor fan motor drive chip. The indoor fan motor socket is disposed in the socket area, and the indoor fan motor drive chip is disposed in the heat sink area. The power supply board further includes a first heat sink, which is used for coupling and heat dissipation with the indoor fan motor drive chip.

[0009] In some embodiments, the power board further includes a fresh air system drive circuit, which includes a fresh air motor socket and a fresh air motor drive chip. The fresh air motor socket is disposed in the socket area, and the fresh air motor drive chip is disposed in the heat sink area.

[0010] In some embodiments, the power board further includes an auxiliary electric heating control circuit, which includes an auxiliary electric heating socket disposed in the socket area.

[0011] In some embodiments, the power supply board further includes a switching power supply circuit, which includes a rectifier diode and a MOSFET, the rectifier diode and the MOSFET being disposed in the heat sink area; the power supply board further includes a second heat sink and a third heat sink, the second heat sink being used for heat dissipation coupled to the rectifier diode, and the third heat sink being used for heat dissipation coupled to the MOSFET.

[0012] In some embodiments, the switching power supply circuit further includes a transformer disposed near the second side of the power board.

[0013] In some embodiments, the power board further includes an AC input circuit, which includes an AC socket for connecting a power cord. The AC socket is located in the socket area and corresponds to the power cord inlet position of the electrical control box.

[0014] In some embodiments, the control board further includes a current loop communication circuit, which includes a current sensing resistor disposed near the fourth side of the power board, with the second side opposite to the fourth side.

[0015] Secondly, embodiments of this application also provide an electrical control box for installing the control board described in the first aspect. The control board further includes a low-voltage board, and the high-voltage board and the low-voltage board are connected by a communication cable. The communication cable socket of the high-voltage board is located in the middle of the high-voltage board.

[0016] In some embodiments, the electrical control box includes a first mounting part and a second mounting part, the first mounting part being used to fix the high-voltage board, the second mounting part being used to fix the low-voltage board, and a first wiring position for communication cables being provided between the first mounting part and the second mounting part.

[0017] In some embodiments, the first mounting portion includes a power cord inlet pipe and a second wiring position for the indoor fan, wherein the inlet position of the power cord inlet pipe and the outlet position of the second wiring position are located on opposite sides of the first mounting portion.

[0018] Thirdly, embodiments of this application also provide an indoor unit, including the control board described in the first aspect and the electrical control box described in the second aspect.

[0019] The control board, electrical control box, and indoor unit of the indoor unit in this application embodiment have at least the following beneficial effects: The power board of the control board includes an electrolytic capacitor area for assembling components such as bus electrolytic capacitors, a heat sink area for assembling components that generate a lot of heat and require a heat sink, and a socket area for connecting cables. In the circuit board layout, the electrolytic capacitors with larger heights are concentrated in the electrolytic capacitor area near the first side. When the power board is installed into the receiving cavity of the electrical control box, it is installed from the first side first, ensuring that the electrolytic capacitors with larger heights can be installed into the electrical control box. The radiator area, due to the need to install multiple radiators and to prevent the edges of the radiators from cutting or burning the cables, is separated from the socket area. The socket area is located on the third side of the power board and, after installation, close to the cavity opening of the electrical control box. This facilitates the connection of cables to the power board by the installers. Through the above layout of the power board, the cable routing connecting to the power board inside the electrical control box can be optimized. At the same time, separating the radiators from the cables avoids the problem of radiators cutting or burning the cables, thus improving the reliability of the electrical control box.

[0020] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description and the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal structure of the indoor wall-mounted air conditioner provided in the embodiments of this application;

[0022] Figure 2 This is a schematic diagram of the structure of the electrical control box provided in the embodiments of this application;

[0023] Figure 3 This is a front view of the electrical control box provided in this embodiment after the high-voltage board and low-voltage board are installed;

[0024] Figure 4 This is a side view of the electrical control box provided in this embodiment of the application after the high-voltage board and low-voltage board are installed;

[0025] Figure 5 This is a schematic diagram of the circuit layout of the high-voltage board provided in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram showing the location of components such as sockets on the power board provided in the embodiments of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various implementations. Simultaneously, the steps or actions described in the method description can be rearranged or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0028] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. Unless otherwise specified, the terms "connection" and "linkage" used in this application include both direct and indirect connections (linkages).

[0030] Indoor wall-mounted air conditioners typically include an evaporator, motor, fresh air system, and electrical control box. To reduce the length of the air conditioner, the motor, fresh air system, and electrical control box are centrally located on the right side. This limits the size of the electrical control box, increasing the assembly difficulty of the control board inside. To achieve separation of high and low voltage circuits, the control board generally consists of two boards: a high-voltage board and a low-voltage board. The high-voltage board handles the high-voltage circuitry, connecting the DC motor of the fresh air system, the DC motor of the indoor fan, and the three-phase AC input. The low-voltage board handles the low-voltage circuitry, housing the main control chip, connecting sensors, display components, and communication interfaces with the high-voltage board. The electrical control box is designed based on the dimensions of the high-voltage and low-voltage boards. However, the high-voltage board contains relatively large components such as electrolytic capacitors, transformers, and radiators. Besides providing an internal cavity to house the high-voltage board, the control box also needs to consider the compatibility of components between the internal cavity and the high-voltage board, as well as the rationality of wiring. Currently, the circuit layout design of the power supply board is separated from the structural design of the control box. The control box needs to have an internal cavity for installing the power supply board. If the internal cavity volume is large, it is not conducive to the miniaturization of the indoor unit. If the internal cavity volume is small, the cables connecting the power supply board are thick and numerous, resulting in dense wiring in the internal cavity. This can easily lead to problems such as the cables being cut by the heat sink, being burned, and electromagnetic interference between the cables.

[0031] Based on this, embodiments of this application provide a control board, an electrical control box, and an indoor unit. The control board's power supply includes an electrolytic capacitor area for mounting components such as busbar electrolytic capacitors, a heat sink area for mounting components that generate significant heat and require a heat sink, and a socket area for connecting cables. In the circuit board layout, the taller electrolytic capacitors are concentrated in the electrolytic capacitor area near the first side. When the power supply board is installed into the receiving cavity of the electrical control box, it is installed from the first side first, ensuring that the taller electrolytic capacitors can be installed into the electrical control box. The radiator area requires multiple radiators, and to prevent the edges of the radiators from cutting or burning the cables, the radiator area and the socket area are separated. The socket area is located on the third side of the power supply board and is close to the opening of the housing cavity of the control box after installation. This makes it easier for installers to connect cables to the power supply board. Through the above layout of the power supply board, the cable routing connecting to the power supply board inside the control box can be optimized. At the same time, separating the radiators from the cables avoids the problem of radiators cutting or burning the cables, thus improving the reliability of the control box.

[0032] The control board, electrical control box, and indoor unit of the indoor unit are described below with reference to the accompanying drawings:

[0033] 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 330 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 4The 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 330 of the electrical control box 300, with the side of the high-voltage board 100 facing the paper to accommodate the longer high-voltage board 100 and the lateral dimensions of the indoor wall-mounted air conditioner.

[0034] Specifically, the power board 100 in this embodiment includes an electrolytic capacitor region, a heat sink region, and a socket region. The electrolytic capacitor region is located at the edge of the first side of the power board 100, the heat sink region is located near the second side of the power board 100, and the socket region is located at the edge of the third side of the power board 100. The first side and the third side are opposite to each other. The power board 100 is used to be installed in the accommodating cavity 310 with the first side facing the bottom of the cavity, so that the third side is close to the opening of the accommodating cavity 310.

[0035] Reference Figure 3 and Figure 4 As can be seen, taking the power board 100 as a rectangular plate as an example, the power board 100 is installed facing the bottom of the cavity 310. The side closest to the bottom of the cavity is the first side, and the two sides adjacent to the first side are the second and fourth sides. The second side is close to the top of the cavity 310, and the third side is opposite to the first side. Therefore, when the power board 100 is placed sideways into the cavity 310 of the electrical control box 300, the lateral width of the cavity 310 needs to meet the maximum height of the electrolytic capacitor. Based on this, the electrolytic capacitor area and the heat sink area are concentrated at the top of the cavity 310, and the socket area is concentrated at the third side. This makes the overall height of the power board 100 decrease from the electrolytic capacitor area side until the height near the third side is the lowest. Furthermore, since the cavity opening of the cavity 310 is the socket area of ​​the power board 100, it is convenient for assembly personnel to perform wiring nearby. In fact, the layout of the power board 100 in this embodiment concentrates the locations where wiring is required at the opening of the cavity 310, and concentrates the electrolytic capacitors and heat sinks at the bottom of the cavity 310. The wiring area and the congested area are separated, which can avoid the problem of heat sinks cutting or burning the cables and improve the reliability of the electrical control box 300.

[0036] Reference Figure 5 As shown, in some embodiments, the power board 100 further includes an indoor fan drive circuit, which includes an indoor fan motor socket 110 and an indoor fan motor drive chip 120. The indoor fan motor socket 110 is disposed in the socket area, and the indoor fan motor drive chip 120 is disposed in the heat sink area. The power board 100 also includes a first heat sink, which is used for coupling and heat dissipation with the indoor fan motor drive chip 120.

[0037] The indoor fan motor is a high-voltage DC operating device. The indoor fan motor driver chip 120 typically operates at a high temperature. Therefore, a first heat sink is provided for the indoor fan motor driver chip 120 to dissipate heat from the motor. Due to the considerable height of the first heat sink, the indoor fan motor driver chip 120 is placed within the heat sink area. The drive pins of the indoor fan motor driver chip 120 are then connected to the indoor fan motor socket 110 via on-board traces. The indoor fan motor socket 110 is located in the socket area on the third side. For example... Figure 6 As shown, the indoor fan motor socket 110 is positioned on the upper part of the third side.

[0038] Reference Figure 5 As shown, in some embodiments, the power board 100 also includes a fresh air system drive circuit, which includes a fresh air motor socket 130 and a fresh air motor drive chip. The fresh air motor socket 130 is disposed in the socket area, and the fresh air motor drive chip is disposed in the heat sink area.

[0039] The motor of the fresh air system is a high-voltage DC operating device. However, compared to the indoor fan motor driver chip 120, the fresh air motor driver chip generates less heat, so a heat sink is not required for it (although a heat sink can be provided depending on the heat dissipation requirements of the indoor wall-mounted air conditioner). Similarly, the fresh air motor driver chip is placed in the heat sink area, and its drive pins are connected to the fresh air motor socket 130 via internal traces. The fresh air motor socket 130 is located in the socket area on the third side. For example... Figure 6 As shown, the fresh air motor socket 130 is located in the middle of the third side, below the indoor fan motor socket 110.

[0040] It is understood that both the indoor fan motor driver chip 120 and the fresh air motor driver chip are IPM modules (Intelligent Power Modules), which control the motor operation by outputting drive signals through internal H-bridge circuits. Since both the indoor fan motor and the fresh air system motor use DC current, one H-bridge circuit can control one DC motor. Some IPM chips integrate two or more H-bridge circuits, so the power board 100 in this embodiment can also be equipped with only one driver chip. The drive pins of the two different H-bridges within this driver chip are connected to the indoor fan motor socket 110 and the fresh air motor driver socket, respectively, thus requiring only a heat sink for this driver chip.

[0041] Reference Figure 5As shown, in some embodiments, the power board 100 further includes an auxiliary electric heating control circuit, which includes an auxiliary electric heating socket 140 disposed in the socket area.

[0042] The electric auxiliary heating function is a feature of wall-mounted air conditioners that rapidly provide heat by generating heat when electricity is applied. Compared to refrigerant heating, it delivers heat to the room much faster, quickly increasing the perceived temperature for users during the initial heating phase. The components of the electric auxiliary heating function also operate on high-voltage DC. The main control chip typically controls the operation of these components indirectly through high-current relays. The main control chip controls the corresponding relays on the low-voltage board 200 via communication cables, thus switching the electric auxiliary heating function on and off. The electric auxiliary heating socket 140 is used to connect the components of the electric auxiliary heating function. For ease of wiring, the electric auxiliary heating socket 140 is located in the socket area. For example... Figure 6 As shown, the electric auxiliary heating socket 140 is positioned on the lower part of the third side.

[0043] Reference Figure 5 As shown, in some embodiments, the power board 100 further includes a switching power supply circuit, which includes a rectifier diode and a MOSFET, and the rectifier diode and MOSFET are disposed in the heat sink area; the power board 100 also includes a second heat sink 150 and a third heat sink 160, the second heat sink 150 being used for heat dissipation by coupling with the rectifier diode, and the third heat sink 160 being used for heat dissipation by coupling with the MOSFET.

[0044] The switching power supply circuit converts 220V AC to DC. Therefore, the rectifier diodes and MOSFETs used in the rectifier circuit need to withstand a large current, resulting in significant heat generation. To concentrate the heatsinks within the heatsink area, the switching power supply circuit is positioned near the third side, with a second heatsink 150 and a third heatsink 160 respectively for the heat-generating rectifier diodes and MOSFETs. Additionally, the switching power supply circuit includes a transformer 170, which is positioned near the second side of the power board 100. The transformer 170 has a relatively large winding size and needs to be close to the rectifier diodes and MOSFETs in the circuit routing; therefore, it is positioned within the heatsink area, and as close as possible to the electrolytic capacitor area. (Refer to...) Figure 6 As shown, the left and right ends of the transformer 170 are the second heat sink 150 and the third heat sink 160 corresponding to the rectifier diode and the MOSFET, respectively, and an electrolytic capacitor is set on the right side of the MOSFET.

[0045] Reference Figure 5As shown, in some embodiments, the power board 100 also includes an AC input circuit, which includes an AC socket 180 for connecting a power cord. The AC socket 180 is located in the socket area and corresponds to the power cord inlet position of the control box 300. The power board 100 is connected to an AC power source, and the switching power supply circuit converts the AC voltage into the operating voltage of external devices and the DC voltage required by the low-voltage circuit. The AC input power cords are relatively thick, occupying a significant amount of space within the control box 300. Currently, the control box 300 has an AC power inlet conduit on its side as the power cord inlet position, and considering separation from the cables for the electric auxiliary heating function and the indoor fan motor, the AC socket 180 is located lower in the socket area. (Refer to...) Figure 6 As shown, AC socket 180 is located on the fourth side of power board 100, electric auxiliary heating socket 140 is located at the lower left corner of power board 100, and indoor fan motor socket 110 is located at the upper left corner of power board 100.

[0046] Reference Figure 5 As shown, in some embodiments, the control board also includes a current loop communication circuit. This current loop communication circuit includes a current-sensing resistor 190, which is positioned near the fourth side of the power board 100, with the second side opposite to the fourth side. The current loop communication circuit serves as the communication circuit between the indoor and outdoor units, transmitting signals via current signals. The current loop communication circuit includes a current loop chip (which can also be implemented using discrete components) and two current-sensing resistors 190. The current loop chip adjusts the current output of the current loop circuit so that the current magnitude is proportional to the output signal of sensors or other devices. Therefore, the current-sensing resistor 190 needs to continuously detect the current, generating significant heat, potentially exceeding 80°C. To prevent the current-sensing resistor 190 from damaging other cables, it is positioned on the fourth side, separating it from the socket area. (Refer to...) Figure 6 As shown, the current sensing resistor 190 is located at the lower right corner of the high-voltage board 100, away from the third side.

[0047] This application embodiment also provides an electrical control box 300, including the control board of any of the above embodiments. The high-voltage board 100 and the low-voltage board 200 installed inside the electrical control box 300 are connected via a communication cable, and the communication cable socket 191 of the high-voltage board 100 is located in the middle of the high-voltage board 100. (Refer to...) Figure 6 The circuit layout of the power supply board 100 shown has the electrolytic capacitor area located at the upper left corner near the first side, the heat sink area located on the second side, the socket area located on the third side, and other smaller components located on the fourth side. Considering all factors, the communication cable socket 191 is positioned in the middle of the power supply board 100.

[0048] In some embodiments, the electrical control box 300 includes a first mounting portion 330 and a second mounting portion 320. The first mounting portion 330 is used to fix the high-voltage board 100, and the second mounting portion 320 is used to fix the low-voltage board 200. A first wiring position 340 for communication cables is provided between the first mounting portion 330 and the second mounting portion 320. (Refer to...) Figure 3 It is understood that the first mounting part 330 is used to fix the high-voltage board 100 laterally, so that the electrolytic capacitors, heat sinks, transformers 170, etc. of the high-voltage board 100 are placed horizontally into the receiving cavity 310 of the electrical control box 300. The second mounting part 320 is used to fix the low-voltage board 200, so that the front of the low-voltage board 200 faces the assembly personnel, and the assembly personnel can easily connect the cables to the sockets on the front of the low-voltage board 200. A communication cable needs to be connected between the high-voltage board 100 and the low-voltage board 200. During assembly, the communication cable is fixed by the first wiring position 340 between the first mounting part 330 and the second mounting part 320. The first wiring position 340 can be a narrow slot structure to facilitate the confinement of the communication cable in the wiring position. The first wiring position 340 can also be a snap-on type, which can release or lock the communication cable by switching the snap-on.

[0049] Reference Figure 3 As shown, in some embodiments, the first mounting portion 330 includes a power cord inlet pipe 350 and a second wiring position 360 for the indoor fan. The inlet position of the power cord inlet pipe and the outlet position of the second wiring position 360 are located on opposite sides of the first mounting portion 330. This is to separate the indoor fan cable, the electric auxiliary heating function cable, and the AC power cable for routing. Figure 3 The view shown is for reference only. The power cord inlet pipe 350 is located on the right side of the housing cavity 310 of the electrical control box 300. The AC power cord passes through the power cord inlet pipe 350 and connects to the AC socket 180 of the power supply board 100. The second wiring position 360 is located on the left side of the housing cavity 310 of the electrical control box 300, close to the opening of the housing cavity 310. The cable connecting the indoor fan motor socket 110 to the indoor fan motor is guided through the second wiring position 360 to the left side of the electrical control box 300. Since the electric auxiliary heating socket 140 is close to the installation area of ​​the low-voltage board 200, the cable for the electric auxiliary heating function is located near the bottom of the housing cavity 310. This cable layout can separate the AC power cord, the indoor fan cable, and the electric auxiliary heating function cable, reducing interference between cables and improving EMI.

[0050] This application also provides an indoor unit, including a control board and an electrical control box 300 as described in any of the above embodiments. The electrical control box 300 and the power supply board 100 are arranged in a coordinated manner, primarily achieving optimizations in several aspects. Figure 6The directions shown are for reference. The first optimization is to avoid routing cables around heat sinks. The indoor fan motor socket 110, fresh air motor socket 130, and electric auxiliary heating socket 140 are designed on the edge of the power board 100. The IPM module and other driver chips are placed close to the socket area to meet the circuit routing design requirements of the board. The AC power socket 180 and the socket for indoor and outdoor connection cables are designed in the lower left position of the power board 100. The taller components such as electrolytic capacitors, transformers 170, heat sinks for MOSFETs, and heat sinks for rectifier diodes are placed close to the upper area of ​​the power board 100 to ensure that the power board 100 can be installed in the electrical control box 300. This allows the cables to avoid heat sinks and heat-generating components, preventing cuts and burns to the cables. The second optimization is to adjust the wiring to improve EMI. Due to the PCB layout requirements of the high-voltage board 100, the 310V bus voltage of the indoor fan motor is converted from 220V, and the 15V and 5V of the low-voltage part are converted from 220V through a switching power supply. This results in a long wiring path for the indoor fan motor drive circuit and more interference. Therefore, the wiring of the indoor fan motor connection line, the connection line of the electric auxiliary heating function and the power line are separated to reduce line interference and improve EMI.

[0051] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: 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.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0053] It should also be understood that the various implementation methods provided in this application can be combined arbitrarily to achieve different technical effects.

[0054] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A control board for an indoor unit, characterized in that, The control board is used to install into the electrical control box of the indoor unit, and the electrical control box is provided with a receiving cavity; The control board includes a power board, which includes an electrolytic capacitor area, a heat sink area, and a socket area. The electrolytic capacitor area is located at the edge of a first side of the power board, the heat sink area is located near a second side of the power board, and the socket area is located at the edge of a third side of the power board. The first side and the third side are opposite to each other. The power board is used to be mounted to the receiving cavity with the first side facing the bottom of the receiving cavity, so that the third side is close to the opening of the receiving cavity.

2. The control board according to claim 1, characterized in that, The power board also includes an indoor fan drive circuit, which includes an indoor fan motor socket and an indoor fan motor drive chip. The indoor fan motor socket is located in the socket area, and the indoor fan motor drive chip is located in the heat sink area. The power board also includes a first heat sink, which is used for coupling and heat dissipation with the indoor fan motor drive chip.

3. The control board according to claim 1, characterized in that, The power board also includes a fresh air system drive circuit, which includes a fresh air motor socket and a fresh air motor drive chip. The fresh air motor socket is located in the socket area, and the fresh air motor drive chip is located in the heat sink area.

4. The control board according to claim 1, characterized in that, The power board also includes an auxiliary electric heating control circuit, which includes an auxiliary electric heating socket located in the socket area.

5. The control board according to claim 1, characterized in that, The power supply board also includes a switching power supply circuit, which includes a rectifier diode and a MOSFET, and the rectifier diode and the MOSFET are disposed in the heat sink area; the power supply board also includes a second heat sink and a third heat sink, the second heat sink being used to couple with the rectifier diode for heat dissipation, and the third heat sink being used to couple with the MOSFET for heat dissipation.

6. The control board according to claim 5, characterized in that, The switching power supply circuit also includes a transformer, which is located on the second side of the power board.

7. The control board according to claim 1, characterized in that, The power board also includes an AC input circuit, which includes an AC socket for connecting a power cord. The AC socket is located in the socket area and corresponds to the power cord inlet position of the electrical control box.

8. The control board according to claim 1, characterized in that, The control board also includes a current loop communication circuit, which includes a current sensing resistor. The current sensing resistor is located near the fourth side of the power board, and the second side is opposite to the fourth side.

9. An electrical control box, characterized in that, For installing the control board as described in any one of claims 1 to 8, the control board further includes a low-voltage board, the high-voltage board and the low-voltage board are connected by a communication cable, and the communication cable socket of the high-voltage board is located in the middle of the high-voltage board.

10. The electrical control box according to claim 9, characterized in that, The electrical control box includes a first mounting part and a second mounting part. The first mounting part is used to fix the high-voltage board, and the second mounting part is used to fix the low-voltage board. A first wiring position for communication cables is provided between the first mounting part and the second mounting part.

11. The electrical control box according to claim 10, characterized in that, The first mounting part includes a power cord inlet pipe and a second wiring position for the indoor fan. The inlet position of the power cord inlet pipe and the outlet position of the second wiring position are located on opposite sides of the first mounting part.

12. An indoor unit, characterized in that, It includes the control board as described in any one of claims 1 to 8 and the electrical control box as described in any one of claims 9 to 11.

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