Cabinet air conditioner circuit and cabinet air conditioner

Abstract

The embodiment of the invention provides a cabinet air conditioner circuit and a cabinet air conditioner, and relates to the technical field of cabinet air conditioners. The distance between the main control MCU (101) and the sliding door power supply control circuit (102) is smaller than the distance between the sliding door power supply control circuit (102) and a stepping motor (105) driven by the stepping motor driving circuit (103), and when the stepping motor driving circuit does not need to be connected to a stepping motor power supply, the main control MCU can send a signal to the sliding door power supply control circuit. The sliding door power supply control circuit disconnects the stepping motor power supply and the stepping motor driving circuit, that is, the section of long wire is powered off, which is equivalent to the disconnection of an antenna, so that the section of long wire does not generate electromagnetic signals and radiation interference, the sliding door stepping motor is also a non-electrified part, and in a large-current space near a wiring board, the sliding door is not electrified. And the coupling interference is greatly reduced, so that the EMC is improved.

Description

Technical Field

[0001] The present application relates to the technical field of cabinet air conditioners, and in particular to a cabinet air conditioner circuit and a cabinet air conditioner. Background Art

[0002] Figure 1 The front view of the cabinet air conditioner indoor unit 11 is shown, with the sliding door 12 in the middle. There are stepper motors on the upper and lower sides of the sliding door 12 (for heavier sliding doors or double doors, there are two stepper motors on the upper side and two stepper motors on the lower side; for lighter sliding doors, there can be one stepper motor on the upper side and one stepper motor on the lower side). The frame indicated by 13 represents the stepper motor. The sliding door of the cabinet air conditioner indoor unit is opened or closed by the stepper motor 13. When the air conditioner is turned on, the sliding door is opened and the air blows out from the sliding door; when the air conditioner is turned off, the sliding door is closed.

[0003] Figure 2 The side view of the air conditioner is shown, and the wires are connected to the terminals on the wiring board 14 below the sliding door from the outside, and then the terminals on the wiring board 14 supply power: one way to the air conditioner's outdoor unit 15, and one way to the electric control board 16 above the sliding door. In the figure, 21 represents the wire from the wiring board 14 to the electric control board 16, and 22 represents the wire from the electric control board 16 to the stepper motor 13 below.

[0004] What needs to be particularly noted for this application is that the electric control board needs to control the stepper motor below (the stepper motor of the sliding door at the lower end must be installed at the lower end of the sliding door), so there is a longer wire 22 from the electric control board to the stepper motor below.

[0005] The applicant has conducted research on the EMC (Electromagnetic Compatibility) test of air conditioners. The EMC test is to test the ability of the electromagnetic energy generated by air conditioners to neither interfere with other equipment nor be interfered by the electromagnetic energy of other equipment. Here is the relevant definition of electromagnetic interference:

[0006] ① Electromagnetic interference propagation pathways are generally divided into two types: : That is, conduction coupling mode and radiation coupling mode. The electromagnetic interference propagation path is generally divided into two types: conduction coupling mode and radiation coupling mode.

[0007] ② Any occurrence of electromagnetic interference must involve the transmission of interference energy and the transmission path (or transmission channel) It is generally believed that there are two ways of electromagnetic interference transmission: one is conduction transmission; the other is radiation transmission. Therefore, from the perspective of the interfered sensor, interference coupling can be divided into two categories: conduction coupling and radiation coupling.

[0008] ③ Conduction transmission: There must be a complete circuit connection between the interference source and the sensor. The interference signal is transmitted to the sensor along this connection circuit, and the interference phenomenon occurs. This transmission circuit may include wires, conductive components of the equipment, power supply, common impedance, ground plane, resistors, inductors, capacitors and mutual inductance elements, etc.

[0009] ④ Radiative transfer : It is transmitted through the medium in the form of electromagnetic waves, and the interference energy is emitted to the surrounding space according to the law of the electromagnetic field. There are three common types of radiation coupling: 1. The electromagnetic wave emitted by antenna A is accidentally received by antenna B, which is called Antenna Pair Antenna coupling ; 2. The electromagnetic field in space is coupled by induction through the wire, which is called Field-to-line coupling ; 3. The high-frequency signal induction between two parallel wires is called Line-to-line inductive coupling .

[0010] In actual engineering, interference between two devices usually involves coupling in many ways. It is precisely because of the simultaneous existence of multiple coupling paths, repeated cross-coupling, and the joint interference that electromagnetic interference becomes difficult to control.

[0011] ⑤ Radiated interference : It means that the interference source couples (interferes) its signal to another electrical network through space. In high-speed PCB and system design, high-frequency signal lines, integrated circuit pins, various connectors, etc. may become radiation interference sources with antenna characteristics, which can emit electromagnetic waves and affect the normal operation of other systems or other subsystems within the system.

[0012] The applicant found Problems :like Figure 1 , Figure 2 The main power line is on the terminal board, especially the one connected to the external unit with a large current, which generates a large magnetic field. The terminal board is very close to the stepper motor below, and the long wire 22 is easily coupled by the magnetic field generated by this large current. In addition, there is a coil inside the stepper motor below, which is similar to a mutual inductor. Multiple coupling paths exist at the same time, and repeated cross-coupling will jointly generate interference, making electromagnetic interference difficult to control, which has a negative impact on the normal operation of the air conditioner and will cause failure in EMC testing.

[0013] To this end, the applicant proposed that a technical problem needs to be solved: the sliding door stepper motor drive circuit needs to be optimized to suppress radiation interference and conducted interference. Summary of the invention

[0014] The purpose of the present application is to provide a cabinet air conditioner circuit and a cabinet air conditioner to solve the technical problem in the prior art that the sliding door stepper motor drive circuit needs to be optimized to suppress radiation interference and conduction interference.

[0015] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions.

[0016] In a first aspect, an embodiment of the present application provides a cabinet air conditioner circuit, including a main control MCU, a sliding door power control circuit, and a stepper motor drive circuit;

[0017] The main control MCU is connected to the control end of the sliding door power control circuit, the first end of the sliding door power control circuit is connected to the stepper motor power supply, and the second end of the sliding door power control circuit is connected to the stepper motor drive circuit;

[0018] The stepper motor driving circuit is used to drive the stepper motor to open or close the sliding door of the cabinet air conditioner; the distance between the main control MCU and the sliding door power control circuit is smaller than the distance between the sliding door power control circuit and the stepper motor driven by the stepper motor driving circuit;

[0019] The main control MCU is used for:

[0020] (1) upon receiving a power-on command, controlling the sliding door power control circuit to be turned on, and then controlling the sliding door power control circuit to be turned off after a preset first time;

[0021] (2) When a shutdown command is received, the sliding door power control circuit is controlled to be turned on, and then after a preset second time, the sliding door power control circuit is controlled to be turned off.

[0022] Optionally, the sliding door power control circuit includes a switch tube module, the control end of the switch tube module is connected to the sliding door power control end of the main control MCU, the first end of the switch tube module is connected to the stepper motor power supply, the second end of the switch tube module is connected to the stepper motor drive circuit, and the ground end of the switch tube module is grounded.

[0023] Optionally, the switch tube module includes a first switch tube, a second switch tube, a first resistor, a second resistor, a third resistor and a fourth resistor;

[0024] The control end of the first switch tube is connected to the main control MCU through the first resistor, the first end of the first switch tube is grounded, and the second resistor is connected between the first end of the first switch tube and the control end of the first switch tube;

[0025] The second end of the first switch tube is connected to the control end of the second switch tube through the third resistor, the first end of the second switch tube is connected to the stepper motor power supply, the fourth resistor is connected between the first end of the second switch tube and the control end of the second switch tube; the second end of the second switch tube is connected to the stepper motor drive circuit.

[0026] Optionally, the switch tube module further includes a diode;

[0027] The cathode of the diode is connected to the first end of the second switch tube, and the anode of the diode is connected to the second end of the second switch tube.

[0028] Optionally, the cabinet air conditioner circuit further includes an IO port expansion circuit;

[0029] The main control MCU is connected to the stepper motor drive circuit through the IO port expansion circuit.

[0030] Optionally, the cabinet air conditioner circuit further includes a current limiting resistor; the main control MCU is connected to the IO port expansion circuit via the current limiting resistor.

[0031] Optionally, the IO port expansion circuit includes a shift register chip with data serial input, data parallel output, and data latching functions.

[0032] Optionally, the stepper motor drive circuit includes a power switch array chip.

[0033] Optionally, the power switch array chip includes multiple ULN2003 chips, and the output ends of the multiple ULN2003 chips are respectively connected to the up and down swing fan motor, the left and right swing fan motor, the fresh air internal circulation motor, the fresh air external circulation motor and the sliding door stepper motor.

[0034] In a second aspect, an embodiment of the present application provides a cabinet air conditioner, which includes the cabinet air conditioner circuit described in the first aspect.

[0035] Compared with the prior art, this application has the following beneficial effects:

[0036] When the stepper motor drive circuit does not need to be connected to the stepper motor power supply, the main control MCU sends a signal to the sliding door power supply control circuit, and the sliding door power supply control circuit disconnects the stepper motor power supply from the stepper motor drive circuit. That is, this longer wire is powered off, which is equivalent to disconnecting the antenna. This longer wire will not generate electromagnetic signals or radiation interference, and the sliding door stepper motor will become a non-charged component. In the high current space near the terminal board, the coupled interference is greatly reduced, thereby improving EMC. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is a schematic diagram of the main view of the indoor unit of the cabinet air conditioner;

[0039] Figure 2 It is a schematic diagram of a side view of a cabinet air conditioner;

[0040] Figure 3 A schematic diagram of a cabinet air conditioner circuit provided in an embodiment of the present application;

[0041] Figure 4 This is a schematic diagram of connecting 8 stepper motors when the main control MCU has no expanded IO port;

[0042] Figure 5 A circuit diagram of a cabinet air conditioner with an IO port expansion circuit provided in an embodiment of the present application;

[0043] Figure 6 A circuit diagram of a cabinet air conditioner using a 74HC595 chip and a ULN2003 chip is provided in an embodiment of the present application.

[0044] Description of reference numerals:

[0045] 11- Cabinet air conditioner indoor unit

[0046] 12- Sliding Door

[0047] 13-Stepper Motor

[0048] 14-Terminal Board

[0049] 15-Air conditioner outdoor unit

[0050] 16-Electric control board

[0051] 21-Wire from the terminal block to the electrical control board

[0052] 22-Wire from the electronic control board to the stepper motor below

[0053] 101-Master MCU

[0054] 102-Sliding door power control circuit

[0055] 1021-Switch Tube Module

[0056] 103-Stepper motor drive circuit

[0057] 104-Stepper Motor Power Supply

[0058] 105-Stepper Motor

[0059] 106-IO port expansion circuit DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described in the drawings here can be arranged and designed in various different configurations.

[0061] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0062] In the description of this application, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium.

[0063] The cabinet air conditioner of this application is as follows Figure 1 , 2 The sliding door has a stepper motor installed at the bottom of the sliding door, which is close to the wiring board and cannot be avoided. The stepper motor connection line is very long, which is similar to an antenna. It is easy to become a radiation interference source with antenna characteristics, and it is easy to be inductively coupled by other antennas, thereby affecting the EMC of the air conditioner. The stepper motor has windings similar to mutual inductance elements, which are also easy to transmit interference signals to the controller through conduction, resulting in its EMC test failure. Therefore, the sliding door stepper motor drive circuit needs to be optimized to suppress radiation interference and conduction interference.

[0064] In order to suppress radiated interference and conducted interference, please refer to Figure 3 The embodiment of the present application provides a cabinet air conditioner circuit, including a main control MCU 101, a sliding door power control circuit 102 and a stepper motor drive circuit 103. The stepper motor drive circuit 103 is used to drive a stepper motor 105, where the stepper motor may refer to a stepper motor under the sliding door, or to a stepper motor above and below the sliding door.

[0065] Figure 3 In the figure, the left end of the sliding door power supply control circuit 102 is defined as the control end, the upper end is defined as the first end, and the right end is defined as the second end. The connection relationship is described as follows:

[0066] The main control MCU 101 is connected to the control end of the sliding door power control circuit 102 , the first end of the sliding door power control circuit 102 is connected to the stepper motor power supply 104 , and the second end of the sliding door power control circuit 102 is connected to the stepper motor drive circuit 103 .

[0067] The distance between the main control MCU 101 and the sliding door power supply control circuit 102 is smaller than the distance between the sliding door power supply control circuit 102 and the stepper motor 105 driven by the stepper motor driving circuit 103. In this way, when the stepper motor driving circuit 103 does not need to be connected to the stepper motor power supply 104, the main control MCU 101 sends a signal to the sliding door power supply control circuit 102, and the sliding door power supply control circuit 102 disconnects the stepper motor power supply 104 from the stepper motor driving circuit 103, that is, Figure 2 The longer wire 22 is powered off, which is equivalent to disconnecting the antenna. This longer wire will not generate electromagnetic signals or radiation interference, and the sliding door stepper motor will become a non-charged component. In the high-current space near the terminal board, the coupled interference is greatly reduced, thereby improving EMC.

[0068] The present application utilizes the following characteristics of the cabinet air conditioner: the sliding door is opened and closed only when the power is turned on and off, the sliding door is opened when the power is turned on and closed when the power is turned off; when the air conditioner is operating in normal cooling, heating or other normal working modes, the sliding door stepper motor will not work.

[0069] To this end, an embodiment of the present invention further provides a readable storage medium, which includes a computer program. When the computer program is running, the main control MCU 101 can execute the following cabinet air conditioner circuit control method:

[0070] (1) upon receiving a power-on command, the sliding door power control circuit 102 is controlled to be turned on, and then after a preset first time (e.g., 40 seconds), the sliding door power control circuit 102 is controlled to be turned off;

[0071] (2) When a shutdown command is received, the sliding door power control circuit 102 is controlled to be turned on, and then after a preset second time, the sliding door power control circuit 102 is controlled to be turned off.

[0072] Specifically:

[0073] (1) In order to open the sliding door when the machine is turned on, the sliding door power control circuit 102 can be turned on immediately upon receiving the power-on command, so that the sliding door stepper motor is powered, and then the sliding door is opened according to the main chip opening sliding door command. After the preset first time, the sliding door has been opened, and there is no need to continue to power the stepper motor drive circuit, so the sliding door power control circuit 102 can be controlled to be disconnected.

[0074] (2) In order to close the sliding door when shutting down the machine, upon receiving the shutdown command, the sliding door power control circuit 102 can be immediately turned on to energize the sliding door stepping motor, and then a sliding door closing command is issued after 1 second to close the sliding door. After the preset second time, the sliding door has been closed, and the sliding door power control circuit 102 can be controlled to be turned off.

[0075] On the other hand, regarding the IO port of the main control MCU, such as Figure 4 (The sliding door power supply control circuit is omitted), Figure 4 The fresh air cabinet air conditioner has up and down swing fan motors, left and right swing fan motors, fresh air internal circulation motors, fresh air external circulation motors and 4 sliding door stepper motors, a total of 8 stepper motors (the 8 on the right side of the figure are motor connection terminals, these terminals can be set on the main control board where the main control MCU is located). Driving these stepper motors requires a lot of IO port drivers (20 IO ports are required), so it is necessary to select a main control MCU chip with more pins.

[0076] In order to adapt to the miniaturized main control MCU chip with fewer pins and reduce costs, such as Figure 5 The embodiment of the present application also provides a cabinet air conditioner circuit with an IO port expansion circuit, and the main control MCU 101 is connected to the stepper motor drive circuit 103 through the IO port expansion circuit 106.

[0077] One implementation method is as follows Figure 6 , Figure 6 The circuit can be integrated on a main control board, and the 8 block-shaped motor terminals in the figure can be set in the form of pin sockets, and the stepper motor drive circuit 103 is connected to the stepper motor through these pin sockets. The IO port expansion circuit 106 can use a shift register chip with a latch function, a chip with data serial input, data latch function and data output parallel output function, such as a 74HC595 chip.

[0078] Figure 6 In the circuit, connect the MR pin No. 10 and the VDD pin No. 16 of the 74HC595 chip to +5V, connect the OE pin No. 13 and the GND pin No. 8 to GND; C1 and C2 can use 104 chip capacitors to play a filtering role to ensure the stable operation of the 74HC595 chip.

[0079] You can also set current limiting resistors R1~R6. The main control MCU is connected to the 74HC595 chip through the current limiting resistors R1~R6 to further ensure the stable operation of the 74HC595 chip. R1~R6 can use 100Ω resistors.

[0080] When SH_CP (shift register clock input) is a rising edge, DS (serial data input) is shifted high to the shift register; 8 data are shifted to the shift register in sequence and appear on the parallel data output (Q0~Q7); when ST_CP (storage register clock input) is a rising edge, the parallel data output (Q0~Q7) is output simultaneously.

[0081] The 74HC595 chip outputs to the stepper motor drive circuit 103, which may include a power switch array chip, such as a ULN2003 chip. C3, C4, C5, and C6 provide filtering for the ULN2003 chip.

[0082] Figure 6 Two 74HC595 chips and two ULN2003 chips are used, which are connected to eight stepper motors. The two 74HC595 chips expand the six IO ports of the main MCU to 16 IO ports, so that the main chip only needs six IO ports to drive eight stepper motors.

[0083] Figure 6 An implementation of a sliding door power control circuit 102 is shown below, where the part indicated by 1021 is a switch tube module, the control end of the switch tube module 1021 is connected to the sliding door power control end of the main control MCU 101, the first end of the switch tube module 1021 is connected to the stepper motor power supply 104, the second end of the switch tube module 1021 is connected to the stepper motor drive circuit 103, and the ground end of the switch tube module 1021 is grounded.

[0084] The switch tube module may specifically include a first switch tube Q1, a second switch tube Q2, a first resistor R7, a second resistor R8, a third resistor R9 and a fourth resistor R10. The connection relationship is described as follows:

[0085] The control end of the first switch tube Q1 is connected to the main control MCU 101 through the first resistor R7, the first end of the first switch tube Q1 is grounded, and the second resistor R8 is connected between the first end of the first switch tube Q1 and the control end of the first switch tube Q1; the second end of the first switch tube Q1 is connected to the control end of the second switch tube Q2 through the third resistor R9, the first end of the second switch tube Q2 is connected to the stepper motor power supply 104, and the fourth resistor R10 is connected between the first end of the second switch tube Q2 and the control end of the second switch tube Q2; the second end of the second switch tube Q2 is connected to the stepper motor drive circuit 103, that is, the power supply ends of the motors PANEL-S-M1, M2, M3, and M4 in the figure are connected to the collector of the transistor Q2.

[0086] When the sliding door power control terminal of the main control MCU 101 outputs a high level of +5V, R7 and R8 divide the voltage, the switch tubes Q1 and Q2 are turned on, and the 12V stepper motor power supply supplies power to the sliding door stepper motor; when the sliding door power control terminal of the main control MCU 101 outputs a low level of 0V, the switch tubes Q1 and Q2 are not turned on, and the 12V stepper motor power supply is not connected to the sliding door stepper motor.

[0087] Figure 6 In the figure, a diode D1 is also provided on the right side of the switch tube module 1021. The cathode of the diode D1 is connected to the first end of the second switch tube Q2, and the anode of the diode D1 is connected to the second end of the second switch tube Q2. In the figure, D1 is connected to the emitter and collector of the transistor Q2, which can ensure that the transistor Q2 is not damaged due to the excessively high induced voltage of the stepper motor. This circuit is simple and reliable.

[0088] Based on the above embodiments, the embodiments of the present application also provide a cabinet air conditioner, including the above cabinet air conditioner circuit, wherein the main control MCU executes the above cabinet air conditioner circuit control method. The wiring board can be arranged at the bottom of the air conditioner and below the sliding door, and a sliding door stepper motor is also arranged below the sliding door and near the wiring board. A main control board is arranged at the upper part of the air conditioner and above the sliding door. The main control board integrates the main control MCU, the sliding door power control circuit and the stepper motor drive circuit, and the terminals of the stepper motor drive circuit are connected to the sliding door stepper motors above and below the sliding door. When the sliding door stepper motor is not in use, the main control MCU controls the sliding door power control circuit to disconnect, and the longer wire between the stepper motor drive circuit and the sliding door stepper motor below the sliding door is not energized, and the stepper motor is also not energized. In the high current space near the wiring board, the coupling interference is greatly reduced, thereby improving EMC.

[0089] In a test of a model of cabinet air conditioner, a terminal voltage test was conducted using 148.5kHz to 30MHz continuous disturbance, and a disturbance power test was conducted using 30MHz to 300MHz continuous disturbance, in accordance with the methods and procedures specified in GB4343.1-2018. The terminal voltage test conditions are:

[0090] Ambient temperature: 26.0C; Relative humidity: 47.3%RH;

[0091] Rated voltage: 220V; Rated frequency: 50Hz;

[0092] Test voltage: 242V; Test frequency: 50Hz;

[0093] Environmental disturbance: ≤20dBμV;

[0094] Working status of the tested device: cooling (set temperature: 16 degrees; wind speed: high wind).

[0095] The disturbance power test conditions are:

[0096] Ambient temperature: 27.4C; Relative humidity: 54.3%RH;

[0097] Rated voltage: 220V; Rated frequency: 50Hz;

[0098] Test voltage: 242V; Test frequency: 50Hz;

[0099] Electromagnetic environment: ≤20dBpW;

[0100] Working status of the tested device: cooling (set temperature: 16 degrees; wind speed: high wind).

[0101] contrast Without adopting the scheme of this application The experimental data curve, and Under the scheme of this application From the test data curve, it can be found that the solution of the present application reduces the peak value of the terminal voltage and the peak value of the interference power by 2 to 3 dBμV or 2 to 3 dBμW, which can make the originally qualified products meet more stringent standards.

[0102] In general, the present application proposes a cabinet air conditioner circuit and a cabinet air conditioner with improved EMC. This circuit not only has a stable and reliable driving signal, but also can effectively improve EMC, greatly improve the pass rate of the air conditioner EMC test, and can greatly reduce the number of driving IO ports required, and can select miniaturized chips to reduce costs.

[0103] The above-described device and system embodiments are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. A person skilled in the art may understand and implement the present embodiment without creative effort.

[0104] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cabinet air conditioner circuit, characterized in that: It comprises a main control MCU (101), a sliding door power supply control circuit (102) and a stepping motor drive circuit (103); The main control MCU (101) is connected to the control end of the sliding door power control circuit (102), the first end of the sliding door power control circuit (102) is connected to the stepping motor power supply (104), and the second end of the sliding door power control circuit (102) is connected to the stepping motor drive circuit (103); The stepper motor driving circuit (103) is used to drive a stepper motor to open or close a sliding door of a cabinet air conditioner; the distance between the main control MCU (101) and the sliding door power supply control circuit (102) is smaller than the distance between the sliding door power supply control circuit (102) and a stepper motor (105) driven by the stepper motor driving circuit (103); The main control MCU is used to: control the sliding door power control circuit (102) to be turned on when receiving a power-on instruction, and then control the sliding door power control circuit (102) to be turned off after a preset first time; The main control MCU is also used to: when receiving a shutdown command, control the sliding door power control circuit (102) to be turned on, and then control the sliding door power control circuit (102) to be turned off after a preset second time.

2. The cabinet air conditioner circuit according to claim 1, characterized in that: The sliding door power supply control circuit (102) comprises a switch tube module (1021), a control end of the switch tube module (1021) is connected to the sliding door power supply control end of the main control MCU (101), a first end of the switch tube module (1021) is connected to the stepper motor power supply (104), a second end of the switch tube module (1021) is connected to the stepper motor drive circuit (103), and a ground end of the switch tube module (1021) is grounded.

3. The cabinet air conditioner circuit according to claim 2, characterized in that: The switch tube module (1021) comprises a first switch tube (Q1), a second switch tube (Q2), a first resistor (R7), a second resistor (R8), a third resistor (R9) and a fourth resistor (R10); The control end of the first switch tube (Q1) is connected to the main control MCU (101) via the first resistor (R7), the first end of the first switch tube (Q1) is grounded, and the second resistor (R8) is connected between the first end of the first switch tube (Q1) and the control end of the first switch tube (Q1); The second end of the first switch tube (Q1) is connected to the control end of the second switch tube (Q2) through the third resistor (R9); the first end of the second switch tube (Q2) is connected to the stepping motor power supply (104); the fourth resistor (R10) is connected between the first end of the second switch tube (Q2) and the control end of the second switch tube (Q2); and the second end of the second switch tube (Q2) is connected to the stepping motor drive circuit (103).

4. The cabinet air conditioner circuit according to claim 3, characterized in that: The switch tube module also includes a diode (D1); The cathode of the diode (D1) is connected to the first end of the second switch tube (Q2), and the anode of the diode (D1) is connected to the second end of the second switch tube (Q2).

5. The cabinet air conditioner circuit according to claim 1, characterized in that: The cabinet air conditioner circuit also includes an IO port expansion circuit (106); The main control MCU (101) is connected to the stepping motor driving circuit (103) via the IO port expansion circuit (106).

6. The cabinet air conditioner circuit according to claim 5, characterized in that: The cabinet air conditioner circuit also includes a current limiting resistor; the main control MCU (101) is connected to the IO port expansion circuit (106) via the current limiting resistor.

7. The cabinet air conditioner circuit according to claim 5, characterized in that: The IO port expansion circuit (106) comprises a shift register chip with data serial input, data parallel output and data latching functions.

8. The cabinet air conditioner circuit according to claim 1, characterized in that: The stepping motor driving circuit (103) comprises a power switch array chip.

9. The cabinet air conditioner circuit according to claim 8, characterized in that: The power switch array chip includes multiple ULN2003 chips, and the output ends of the multiple ULN2003 chips are respectively connected to the up-and-down swing fan motor, the left-and-right swing fan motor, the fresh air internal circulation motor, the fresh air external circulation motor and the sliding door stepping motor.

10. A cabinet air conditioner, characterized in that: The cabinet air conditioner comprises a cabinet air conditioner circuit according to any one of claims 1 to 9, wherein the main control MCU is used to execute the following cabinet air conditioner circuit control method: When receiving a power-on command, the sliding door power control circuit (102) is controlled to be turned on, and then after a preset first time, the sliding door power control circuit (102) is controlled to be turned off; When a shutdown command is received, the sliding door power control circuit (102) is controlled to be turned on, and then after a preset second time, the sliding door power control circuit (102) is controlled to be turned off.

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