Control system and air conditioning system

Abstract

The invention relates to a control system and an air conditioning system. The control system comprises a main control board, a variable-frequency driving board and a high-voltage pressure switch, the variable-frequency driving board comprises a driving power source and a load working module, the load working module is used for being connected with a load, the driving power source is used for providing driving voltage for the load working module, and the high-voltage pressure switch is electrically connected with the main control board and the variable-frequency driving board. The main control board is electrically connected with the variable frequency driving board; and under the condition that the pressure of the air conditioning system is greater than the set pressure, the high-pressure pressure switch is switched off to disconnect the driving power supply from the load working module, so that the load stops. According to the control system, under the condition that the pressure of the air conditioning system is larger than the set pressure, the high-pressure pressure switch is switched off to enable the driving power source to be disconnected from the load working module, so that the load is shut down, operation of the load can be directly cut off from hardware, and safe shutdown protection, low cost and high reliability are achieved. Meanwhile, the safety problem caused by the fact that the high-voltage pressure switch is connected to the high-voltage circuit of the variable-frequency drive board is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control system and an air conditioning system. Background Art

[0002] In related technologies, the compressor of an air conditioning system compresses the refrigerant, which then passes through the condenser and evaporator to achieve cooling or heating. The fan motor, on the other hand, removes heat (under cooling conditions), reducing system pressure accordingly. Pressure must be controlled throughout the entire operation process, and it should not be too high. Excessive system pressure can increase system load and even create safety risks such as pipe bursts.

[0003] Air conditioning systems are equipped with pressure sensors to monitor system pressure in real time for control and regulation. They are also equipped with a high-pressure switch that trips when a certain pressure is reached, triggering an alarm and shutting down the system, thus achieving a safe shutdown. Currently, the high-pressure switch is connected in series with the control coil of the main circuit relay of the variable frequency drive (VFD). When the high-pressure switch activates, it disconnects the main circuit relay, switching the main circuit power supply and forcing the system to shut down. While this achieves a forced shutdown, abruptly switching the main circuit power relay during high current operation can cause arcing and contact sticking. Summary of the Invention

[0004] The embodiments of the present invention provide a control system and an air-conditioning system to solve at least one of the above-mentioned technical problems.

[0005] An embodiment of the present invention provides a control system, comprising a main control board, a variable frequency drive board, and a high-voltage pressure switch, wherein the variable frequency drive board comprises a driving power supply and a load working module, wherein the load working module is configured to be connected to a load, and the driving power supply is configured to provide a driving voltage to the load working module, wherein the high-voltage pressure switch is electrically connected to the main control board and the variable frequency drive board, and wherein the main control board is electrically connected to the variable frequency drive board;

[0006] When the pressure of the air-conditioning system is greater than the set pressure, the high-pressure switch is disconnected to disconnect the driving power supply from the load working module, thereby shutting down the load.

[0007] In this control system, if the air conditioning system pressure exceeds the set pressure, the high-pressure switch opens, disconnecting the drive power supply from the load operating module, thereby shutting down the load. This directly cuts off the load's operation through hardware, achieving a safety shutdown with low cost and high reliability. It also solves the safety issue associated with connecting the high-pressure switch to the high-voltage circuit of the variable frequency drive board.

[0008] In some embodiments, the variable frequency drive board includes a power control module, which includes a control module and a power switch, the control module is electrically connected to the high-pressure pressure switch and the power switch, and the power switch is connected between the load working module and the driving power supply;

[0009] The control module is used to detect the connection status of the high-pressure pressure switch, and when the high-pressure pressure switch is in a closed state, control the power switch to close to power on the load working module; when the high-pressure pressure switch is in an open state, control the power switch to open to power off the load working module.

[0010] In certain embodiments, the control module includes a first circuit and a switch control circuit, the first circuit being electrically connected to the high-pressure switch and the switch control circuit, and the switch control circuit being electrically connected to the power switch;

[0011] The first circuit is configured to output a first control signal to enable the switch control circuit to control the power switch to be closed when the high-pressure switch is in a closed state;

[0012] The first circuit is used to stop working when the high-pressure pressure switch is in the disconnected state so that the switch control circuit controls the power switch to be disconnected.

[0013] In some embodiments, the variable frequency drive board includes a drive control unit, which is electrically connected to the main control board and the power control module;

[0014] The main control board is used to obtain the first connection state of the high-pressure pressure switch;

[0015] The driving control unit is configured to obtain a second connection state of the high-pressure pressure switch through the power control module;

[0016] When the first connection state and the second connection state are different, the drive control unit is used to control the switch control circuit to disconnect the power switch, so as to cut off the power supply of the load working module;

[0017] The connection state of the high-pressure pressure switch includes an open state and a closed state.

[0018] In some embodiments, the variable frequency drive board further includes a second circuit electrically connected to the high-pressure pressure switch and the drive control unit;

[0019] The driving control unit is configured to obtain a third connection state of the high-pressure switch through the second circuit;

[0020] When any two of the first connection state, the second connection state and the third connection state are different, the drive control unit is used to control the switch control circuit to disconnect the power switch, thereby powering off the load working module.

[0021] In some embodiments, the driving control unit is configured to control the load working module to stop supplying power to the load if it detects that the load is still in a working state after controlling the power switch to be turned off.

[0022] In some embodiments, the control system is configured to issue an alarm when any two of the first connection state, the second connection state, and the third connection state are different.

[0023] In some embodiments, the load working module includes a drive circuit and a power circuit, the drive circuit is electrically connected to the drive control unit and the power switch, and the power circuit is electrically connected to the drive circuit and the load;

[0024] The drive control unit is used to send a PWM control signal to the drive circuit to make the drive circuit work and thus make the power circuit supply power to the load, and stop sending the PWM control signal to the drive circuit to make the drive circuit stop working and thus make the power circuit stop supplying power to the load.

[0025] In some embodiments, the control module includes a first circuit and a switch control circuit, the switch control circuit is electrically connected to the first circuit and the power switch, the first circuit and the second circuit are electrically connected to the main control board through a first weak current signal line, and the drive control unit is electrically connected to the main control board through a second weak current signal line.

[0026] In some embodiments, the drive control unit is electrically connected to the switch control circuit, the load working module includes a drive circuit and a power circuit, the drive circuit is electrically connected to the drive control unit and the power switch, and the power circuit is electrically connected to the drive circuit and the load;

[0027] The drive control unit is used to control the operation of the power switch by controlling the switch control circuit after the control system is powered on, and in the event of an abnormality in the power switch, control the control system to issue an alarm and stop sending PWM control signals to the drive circuit to stop the drive circuit from working and thereby stop the power circuit from supplying power to the load.

[0028] In certain embodiments, the control system is configured to issue an alarm when the pressure of the air-conditioning system is greater than the set pressure.

[0029] In some embodiments, the high-pressure switch is connected to the main control board and the variable frequency drive board via weak electricity, and the main control board is connected to the variable frequency drive board via weak electricity.

[0030] An air-conditioning system according to an embodiment of the present invention includes the control system described in any one of the above embodiments and a load, wherein the load working module is connected to the load.

[0031] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0033] Figures 1 to 2 Schematic diagram of a control system module according to an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of a module of an air-conditioning system according to an embodiment of the present invention.

[0035] Description of main component reference numerals:

[0036] Air conditioning system 2000, control system 1000, load 3000, main control board 100, high-pressure pressure switch 200, variable frequency drive board 300, main control unit 101, drive power supply 301, drive control unit 302, load working module 303, power control module 304, second circuit 305, drive circuit 3031, power circuit 3032, power switch 3041, control module 3042, first circuit 30421, switch control circuit 30422;

[0037] Compressor 20 , expansion valve 50 , fan assembly 60 . DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and are not to be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0041] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0042] The disclosure herein provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0043] See also Figure 1The embodiment of the present invention provides a control system 1000, which includes a main control board 100, a variable frequency drive board 300, and a high-pressure pressure switch 200. The variable frequency drive board 300 includes a driving power supply 301 and a load working module 303. The load working module 303 is used to connect to a load 3000. The driving power supply 301 is used to provide a driving voltage to the load working module 303. The high-pressure pressure switch 200 is electrically connected to the main control board 100 and the variable frequency drive board 300. The main control board 100 is electrically connected to the variable frequency drive board 300.

[0044] When the pressure of the air-conditioning system 2000 is greater than the set pressure, the high-pressure switch 200 is disconnected to disconnect the driving power supply 301 from the load working module 303, thereby shutting down the load 3000.

[0045] In the control system 1000, when the pressure of the air conditioning system 2000 exceeds the set pressure, the high-pressure pressure switch 200 is disconnected, thereby disconnecting the drive power supply 301 from the load working module 303, thereby shutting down the load 3000. This can directly cut off the operation of the load 3000 through hardware, achieving a safety protection shutdown with low cost and high reliability. At the same time, it also solves the safety issues caused by the high-pressure pressure switch 200 being connected to the high-voltage circuit of the variable frequency drive board 300.

[0046] Specifically, the control system 1000 can be used in the air conditioning system 2000. Figure 3 The air conditioning system 2000 is a system for adjusting space environmental parameters, including but not limited to air temperature, humidity, cleanliness, wind speed, and airflow distribution. The air conditioning system 2000 may include but is not limited to a compressor 20, a condenser, an evaporator, an expansion valve 50, a fan assembly 60, and a control system 1000. The compressor 20, the condenser, the evaporator, and the expansion valve 50 may be connected through a refrigerant pipe to form a refrigerant circuit, and the refrigerant may circulate in the refrigerant pipe. The fan assembly 60 can be used to drive air flow, enhance heat exchange effects, and accelerate heat transfer. The control system 1000 can be used to perform real-time monitoring, logical judgment, abnormality detection, and control management of the air conditioning system 2000, thereby ensuring, to a certain extent, the stability and safety of the air conditioning system 2000 under different operating conditions.

[0047] In the related art, during the operation of an air conditioning system, the compressor compresses low-temperature, low-pressure refrigerant into high-temperature, high-pressure refrigerant for subsequent heat exchange with the condenser or evaporator to achieve cooling or heating. Pressure must be controlled throughout the entire air conditioning system operation. Excessive pressure can increase system load and even create safety risks such as pipe bursts.

[0048] Air conditioning systems are equipped with a high-pressure switch. When the system pressure reaches a certain value, the switch disconnects, triggering an alarm and shutting down the air conditioning system, thus achieving a safe shutdown. Currently, there are three common approaches. The first approach involves connecting the high-pressure switch directly to the air conditioning system's control computer board, where the main control software determines the switch's status and activates a shutdown protection mechanism. The second approach involves connecting the high-pressure switch in series with the control coil of the variable frequency drive's main circuit relay. When the high-pressure switch activates, it disconnects the main circuit relay, switching the main circuit power supply and forcing the system to shut down. The third approach involves connecting the high-pressure switch to the variable frequency drive, where a conversion circuit controls the inverter's PWM signal to achieve a shutdown.

[0049] However, the first method mentioned above relies on software algorithms for judgment. When the software is abnormal, it cannot achieve safe and reliable shutdown. Reliability assessment is required, and reassessment is required when the software is changed. Although method two achieves forced shutdown, suddenly switching the main circuit power relay during high current operation will produce arcing, causing contact adhesion. Although method three solves the problems of methods one and two, the high-voltage switch carries strong electricity, which poses safety issues and requires additional diagnostic circuits, which is costly.

[0050] In the embodiment of the present invention, the control system 1000 includes a main control board 100 , a variable frequency drive board 300 and a high pressure switch 200 .

[0051] The main control board 100 can be used to perform real-time monitoring, logic judgment, abnormality detection and control management of the operating status of the entire air conditioning system 2000. The variable frequency drive board 300 can be used to monitor, drive and control the operation of the load 3000.

[0052] High-pressure switch 200 monitors the pressure of air conditioning system 2000 in real time. When the pressure of air conditioning system 2000 exceeds a set pressure, high-pressure refrigerant pushes the switch open, causing it to switch from a closed state to an open state, thereby shutting down load 3000. This, to a certain extent, prevents the pressure of air conditioning system 2000 from continuing to rise due to continued operation of load 3000. Load 3000 includes the motor of compressor 20. Shutting down the motor of compressor 20 means that compressor 20 stops outputting high-pressure, high-temperature refrigerant.

[0053] Alternatively, in one embodiment, the pressure of the air-conditioning system 2000 may refer to the pressure at the output end of the compressor 20 for outputting high-pressure and high-temperature refrigerant. The load 3000 includes the motor of the compressor 20. After the motor of the compressor 20 stops, the fan assembly 60 can continue to work to remove heat (under cooling conditions), causing the pressure of the air-conditioning system 2000 to drop. In one embodiment, the load 3000 includes the motors of the compressor 20 and the fan assembly 60. After the motor of the compressor 20 stops, the motor of the fan assembly 60 also stops, and the air-conditioning system 2000 stops running as a whole, so as to maximize the safety of the air-conditioning system 2000. In other embodiments, the load 3000 may be other loads 3000 that cause the pressure of the air-conditioning system 2000 to rise.

[0054] Optionally, the set pressure can be determined by experimental testing, simulation analysis, or other methods based on the parameters and safety requirements of the air conditioning system 2000, and is not specifically limited in the embodiments of the present invention. It can be understood that the set pressure is the maximum pressure at which the air conditioning system 2000 can operate normally for a long period of time.

[0055] The variable frequency drive board 300 includes a drive power supply 301 and a load working module 303. The drive power supply 301 can provide a drive voltage to the load working module 303 to turn on the load working module 303. Optionally, the drive power supply 301 is a low-voltage DC power supply (e.g., 3.3V, 5V, 15V, 24V, etc.). The load working module 303 is used to connect to the load 3000 to drive the load 3000 to operate. Optionally, the load working module 303 may include a power conversion circuit composed of insulated gate bipolar transistors (IGBTs) to implement functions such as start-stop control, speed regulation, and output power regulation of the load 3000.

[0056] The main control board 100 is electrically connected to the variable frequency drive board 300. Specifically, the variable frequency drive board 300 may include a drive control unit 302, and the main control board 100 may include a main control unit 101. The main control unit 101 may be electrically connected to the drive control unit 302 to achieve data exchange. The drive control unit 302 can be used to perform real-time monitoring, logical judgment, abnormality monitoring, and control management of the operating status of the load 3000. The main control unit 101 can be used to perform real-time monitoring, logical judgment, abnormality monitoring, and control management of the operating status of the air-conditioning system 2000. Optionally, the drive control unit 302 includes but is not limited to a microcontroller unit (MCU), and the main control unit 101 includes but is not limited to a microcontroller unit (MCU).

[0057] The high-pressure pressure switch 200 is electrically connected to the main control board 100 and the variable frequency drive board 300. The main control board 100 and the variable frequency drive board 300 can monitor the connection status of the high-pressure pressure switch 200 in real time. When the pressure of the air-conditioning system 2000 is greater than the set pressure, the high-pressure pressure switch 200 is disconnected to disconnect the driving power supply 301 from the load working module 303, thereby shutting down the load 3000.

[0058] Optionally, in one embodiment, the normal operation of the air conditioning system 2000 relies on a stable mains power supply. Mains power refers to alternating current (AC) supplied by the public power system. The mains power supply provides the basic power input for the entire air conditioning system 2000, typically at a voltage of 220V or 380V and a frequency of 50Hz. The drive power supply 301 provides the necessary auxiliary power for the operation of the variable frequency drive board 300, typically at a lower voltage level, such as 3.3V, 5V, 15V, or 24V.

[0059] Disconnecting the high-voltage pressure switch 200 disconnects the driver power supply 301 from the load operating module 303, thereby stopping the load operating module 303 and, in turn, de-energizing the load 3000. This directly cuts off the operation of the load 3000 from the hardware, achieving a safety protection shutdown with low cost and high reliability. Furthermore, due to the low voltage level of the driver power supply 301, disconnecting the driver power supply 301 from the load operating module 303 is a low-current weak current control method. This solves the safety issues such as arcing and contact sticking that may arise when the high-voltage pressure switch 200 is directly connected to the high-voltage circuit of the variable frequency drive board 300 (the high-voltage switch is connected in series to the control coil of the main circuit relay of the variable frequency drive).

[0060] In some embodiments, please combine Figure 1 and Figure 2 The variable frequency drive board 300 includes a power control module 304, which includes a control module 3042 and a power switch 3041. The control module 3042 is electrically connected to the high-pressure pressure switch 200 and the power switch 3041. The power switch 3041 is connected between the load working module 303 and the driving power supply 301.

[0061] The control module 3042 is used to detect the connection status of the high-pressure pressure switch 200, and when the high-pressure pressure switch 200 is in a closed state, controls the power switch 3041 to close so that the load working module 303 is powered on; when the high-pressure pressure switch 200 is in a disconnected state, controls the power switch 3041 to disconnect so that the load working module 303 is powered off.

[0062] In the above embodiment, the control module 3042 controls the on and off of the power switch 3041 according to the connection status of the high-pressure pressure switch 200, thereby realizing the on and off control of the load working module 303, and can directly cut off the operation of the load 3000 from the hardware, realizing safety protection shutdown, low cost and high reliability.

[0063] Specifically, the power control module 304 may include a control module 3042 and a power switch 3041. The control module 3042 may be electrically connected to the power switch 3041 to control the power switch 3041. The control module 3042 may be electrically connected to the high-pressure pressure switch 200 to facilitate detecting the connection status of the high-pressure pressure switch 200.

[0064] The power switch 3041 is connected between the load working module 303 and the driving power supply 301. When the high-pressure pressure switch 200 is closed, the power switch 3041 is closed, and the driving power supply 301 provides a stable driving voltage to the load working module 303, turning on the load working module 303 and enabling normal operation, thereby enabling the normal operation of the load 3000. When the high-pressure pressure switch 200 is opened, the power switch 3041 is opened, disconnecting the driving power supply 301 from the load working module 303, and shutting down the load 3000.

[0065] In some embodiments, please combine Figure 1 and Figure 2 The control module 3042 includes a first circuit 30421 and a switch control circuit 30422. The first circuit 30421 is electrically connected to the high-pressure pressure switch 200 and the switch control circuit 30422. The switch control circuit 30422 is electrically connected to the power switch 3041.

[0066] The first circuit 30421 is used to output a first control signal to enable the switch control circuit 30422 to control the power switch 3041 to close when the high-pressure pressure switch 200 is in the closed state;

[0067] The first circuit 30421 is used to stop working and enable the switch control circuit 30422 to control the power switch 3041 to be disconnected when the high-pressure pressure switch 200 is in the disconnected state.

[0068] In the above embodiment, the first circuit 30421 controls the switch control circuit 30422 according to the connection status of the high-pressure pressure switch 200, and the switch control circuit 30422 controls the on and off of the power switch 3041, thereby realizing the on and off control of the load working module 303, and can directly cut off the operation of the load 3000 from the hardware, realizing safety protection shutdown, low cost and high reliability.

[0069] Specifically, the first circuit 30421 is electrically connected to the high-pressure pressure switch 200 and the switch control circuit 30422. The switch control circuit 30422 is electrically connected to the power switch 3041.

[0070] When the high-pressure pressure switch 200 is in a closed state, the first circuit 30421 operates normally and outputs a first control signal. The switch control circuit 30422 controls the power switch 3041 to close according to the first control signal. The driving power supply 301 provides a stable driving voltage to the load working module 303, so that the load working module 303 operates normally, thereby enabling the load 3000 to operate normally.

[0071] When the high-pressure pressure switch 200 is in the disconnected state, the first circuit 30421 stops working, and the switch control circuit 30422 controls the power switch 3041 to disconnect without receiving the first control signal, and the driving power supply 301 is disconnected from the load working module 303, that is, the load working module 303 is powered off, causing the load 3000 to shut down.

[0072] In some embodiments, please combine Figure 1 and Figure 2 , the variable frequency drive board 300 includes a drive control unit 302, and the drive control unit 302 is electrically connected to the main control board 100 and the power control module 304;

[0073] The main control board 100 is used to obtain a first connection state of the high-pressure pressure switch 200;

[0074] The driving control unit 302 is configured to obtain the second connection state of the high-pressure pressure switch 200 through the power control module 304;

[0075] When the first connection state and the second connection state are different, the driving control unit 302 is used to control the switch control circuit 30422 to disconnect the power switch 3041, so that the load working module 303 is powered off;

[0076] The connection state of the high pressure switch 200 includes an open state and a closed state.

[0077] In the above embodiment, the connection status of the high-pressure pressure switch 200 is independently detected by the main control board 100 and the drive control unit 302, and protective shutdown control is executed when the detection results are inconsistent, thereby improving the accuracy and safety reliability of fault detection.

[0078] Specifically, the driving control unit 302 is electrically connected to the main control board 100 and the power control module 304 , thereby enabling data interaction.

[0079] The main control board 100 is electrically connected to the high-pressure pressure switch 200. The main control board 100 can obtain a first connection state input-1 of the high-pressure pressure switch 200. The drive control unit 302 can be electrically connected to the power control module 304, which can be electrically connected to the high-pressure pressure switch 200. The drive control unit 302 can obtain a second connection state input-2 of the high-pressure pressure switch 200 through the power control module 304.

[0080] When the first connection state input-1 and the second connection state input-2 are different, the drive control unit 302 cannot obtain the actual connection state of the high-pressure pressure switch 200. The drive control unit 302 can be used to control the switch control circuit 30422 to disconnect the power switch 3041, thereby cutting off the power to the load working module 303, thereby shutting down the load 3000.

[0081] It is understood that the high-pressure switch 200 is electrically connected to the power control module 304, and the connection status of the high-pressure switch 200 directly affects the operating status of the power control module 304. The drive control unit 302 can obtain the operating status of the power control module 304 in real time and infer the connection status of the high-pressure switch 200, i.e., the second connection status input-2, based on the operating status of the power control module 304.

[0082] If the first connection state input-1 and the second connection state input-2 are different, there may be a fault in the high-pressure pressure switch 200, the power control module 304, or their connecting circuits. Upon detecting this abnormality, the control system 1000 can shut down the load 3000 to ensure the safety of the air conditioning system 2000. Furthermore, this can be used to diagnose the source of the fault and provide auxiliary information for subsequent maintenance and troubleshooting.

[0083] In some embodiments, please combine Figure 1 and Figure 2 , the variable frequency drive board 300 further includes a second circuit 305, and the second circuit 305 is electrically connected to the high pressure switch 200 and the drive control unit 302;

[0084] The driving control unit 302 is configured to obtain the third connection state of the high-pressure pressure switch 200 through the second circuit 305 ;

[0085] When any two of the first connection state, the second connection state and the third connection state are different, the driving control unit 302 is used to control the switch control circuit 30422 to disconnect the power switch 3041 and power off the load working module 303.

[0086] In the above embodiment, by providing the second circuit 305 , the driving control unit 302 can perform additional detection based on the third connection state of the high-pressure pressure switch 200 , thereby realizing multi-channel redundant monitoring.

[0087] Specifically, the second circuit 305 is electrically connected to the driving control unit 302 and the high pressure switch 200 , respectively. The driving control unit 302 can obtain the third connection state input- 3 of the high pressure switch 200 through the second circuit 305 .

[0088] When any two of the first connection state input-1, the second connection state input-2 and the third connection state input-3 are different, the drive control unit 302 cannot obtain the actual connection state of the high-pressure pressure switch 200. The drive control unit 302 can be used to control the switch control circuit 30422 to disconnect the power switch 3041, thereby cutting off the power to the load working module 303, thereby shutting down the load 3000.

[0089] It is understood that the high-pressure pressure switch 200 is electrically connected to the second circuit 305, and the connection state of the high-pressure pressure switch 200 directly affects the operating state of the second circuit 305. The drive control unit 302 can obtain the operating state of the second circuit 305 in real time and infer the connection state of the high-pressure pressure switch 200, i.e., the third connection state input-3, based on the operating state of the second circuit 305.

[0090] If any two of the first connection state input-1, the second connection state input-2, and the third connection state input-3 are different, there may be a fault in the high-pressure pressure switch 200, the second circuit 305, the power control module 304, or their connecting circuits. Upon detecting this abnormality, the control system 1000 can shut down the load 3000 to ensure the safety of the air conditioning system 2000. Furthermore, this can be used to diagnose the source of the fault and provide auxiliary information for subsequent maintenance and troubleshooting.

[0091] In some embodiments, please combine Figure 1 and Figure 2 The driving control unit 302 is used to control the load working module 303 to stop supplying power to the load 3000 when it detects that the load 3000 is still in the working state after the power switch 3041 is turned off.

[0092] In the above embodiment, when the drive control unit 302 controls the power switch 3041 to disconnect and shuts down the load 3000 due to an abnormality, the drive control unit 302 can further control the load working module 303 to shut down, thereby avoiding, to a certain extent, the load 3000 from continuing to run due to the abnormal failure of the power switch 3041.

[0093] Specifically, the drive control unit 302 is electrically connected to the switch control circuit 30422. The drive control unit 302 can send a second control signal to the switch control circuit 30422 to control the power switch 3041 to disconnect through the switch control circuit 30422, so that the drive power supply 301 is disconnected from the load working module 303, thereby shutting down the load 3000.

[0094] After the drive control unit 302 controls the power switch 3041 to be turned off, if it detects that the load 3000 is still in operation, it indicates that an abnormality has occurred in the control of the power switch 3041 to be turned off by the switch control circuit 30422. In this case, the drive control unit 302 can directly control the load working module 303 to stop supplying power to the load 3000.

[0095] Optionally, in one embodiment, the load working module 303 includes a drive circuit 3031 and a power circuit 3032. The drive control unit 302 is electrically connected to the drive circuit 3031 and the power circuit 3032, respectively. The drive circuit 3031 is electrically connected to the power circuit 3032, and the power circuit 3032 is electrically connected to the load 3000. The drive control unit 302 can monitor the current of the power circuit 3032 in real time. When the drive control unit 302 controls the power switch 3041 to be turned off, it is still detected that the current of the power circuit 3032 is not zero, that is, an abnormality occurs when the power switch 3041 is turned off by the switch control circuit 30422. At this time, the drive control unit 302 can control the power circuit 3032 by controlling the drive circuit 3031, so that the power circuit 3032 stops supplying power to the load 3000.

[0096] In some embodiments, please combine Figure 1 and Figure 2 The control system 1000 is used to issue an alarm when any two of the first connection state, the second connection state and the third connection state are different.

[0097] In the above implementation, users or operation and maintenance personnel can be reminded to pay attention to the system status, and possible hidden faults can be checked and handled in a timely manner.

[0098] Specifically, when any two of the first connection state input-1, the second connection state input-2, and the third connection state input-3 are different, the control system 1000 may determine that there is a potential abnormality. At this time, the control system 1000 may actively issue an alarm signal to remind users or operation and maintenance personnel to pay attention to the system status and promptly check and handle possible hidden faults.

[0099] Optionally, when it is detected that any two of the first connection state input-1, the second connection state input-2, and the third connection state input-3 are different, the abnormal event may be recorded to facilitate subsequent maintenance and fault tracing.

[0100] In some embodiments, please combine Figure 1 and Figure 2 The load working module 303 includes a drive circuit 3031 and a power circuit 3032. The drive circuit 3031 is electrically connected to the drive control unit 302 and the power switch 3041. The power circuit 3032 is electrically connected to the drive circuit 3031 and the load 3000.

[0101] The drive control unit 302 is used to send a PWM control signal to the drive circuit 3031 to make the drive circuit 3031 work and thus make the power circuit 3032 supply power to the load 3000, and stop sending the PWM control signal to the drive circuit 3031 to make the drive circuit 3031 stop working and thus make the power circuit 3032 stop supplying power to the load 3000.

[0102] In the above embodiment, the driving control unit 302 can control the driving circuit 3031 through the PWM control signal, thereby achieving precise control of the power circuit 3032 and thus achieving precise control of the load 3000 .

[0103] Specifically, the load working module 303 includes a drive circuit 3031 and a power circuit 3032. The drive circuit 3031 is electrically connected to the drive control unit 302 and the power switch 3041 respectively, and the power circuit 3032 is electrically connected to the drive circuit 3031 and the load 3000 respectively.

[0104] The drive circuit 3031 can be used to receive and process the PWM control signal from the drive control unit 302 and convert the PWM control signal into a control signal for turning the power circuit 3032 on and off, thereby controlling the power circuit 3032. Under the control of the drive circuit 3031, the power circuit 3032 provides an operating current to the load 3000 to power and drive the load 3000.

[0105] After the drive control unit 302 controls the power switch 3041 to be turned off, if it detects that the load 3000 is still in operation, it indicates that an abnormality has occurred in the control of the switch control circuit 30422 to turn off the power switch 3041. In this case, the drive control unit 302 can stop sending the PWM control signal to the drive circuit 3031 to stop the drive circuit 3031 from operating, thereby causing the power circuit 3032 to stop supplying power to the load 3000.

[0106] Optionally, the power circuit 3032 may include a power conversion circuit composed of insulated gate bipolar transistors (IGBTs) to achieve functions such as start and stop control, speed regulation, and output power regulation of the load 3000.

[0107] In some embodiments, please combine Figure 1 and Figure 2 The control module 3042 includes a first circuit 30421 and a switch control circuit 30422. The switch control circuit 30422 is electrically connected to the first circuit 30421 and the power switch 3041. The first circuit 30421 and the second circuit 305 are electrically connected to the main control board 100 through a first weak-current signal line. The drive control unit 302 is electrically connected to the main control board 100 through a second weak-current signal line.

[0108] In the above embodiment, the first weak-current signal line and the second weak-current signal line are both weak-current signals, which can improve the safety of the control system 1000 .

[0109] Specifically, the first weak-current signal line and the second weak-current signal line refer to a type of conductor used to transmit low-voltage and low-current electrical signals, control signals, data signals, or status information in the control system 1000 .

[0110] The first circuit 30421 and the second circuit 305 are electrically connected to the main control board 100 through the first weak-current signal line, and the main control board 100 is electrically connected to the high-pressure pressure switch 200. The first circuit 30421 and the second circuit 305 can monitor the electrical signal changes of the high-pressure pressure switch 200 on the first weak-current signal line through the main control board 100, obtain the connection status information of the high-pressure pressure switch 200 (i.e., the second connection status and the third connection status), and provide the status information to the drive control unit 302 for subsequent control judgment and fault detection.

[0111] The driving control unit 302 is electrically connected to the main control unit 101 of the main control board 100 via the second weak-electric signal line, thereby enabling data exchange between the driving control unit 302 and the main control board 100 .

[0112] In one embodiment, the first circuit 30421 is an isolation circuit. The second circuit 305 is an isolation circuit. An isolation circuit is a circuit that transmits signals or energy between two circuits using an indirect electrical connection to reduce the mutual influence between the two circuits.

[0113] The first circuit 30421 is used to convert the signal from the high-pressure switch 200 on the main control board 100 into a signal from the high-pressure switch 200 on the variable frequency drive board 300, thereby activating the switch control circuit 30422 and thereby controlling the power switch 3041. Optionally, the first circuit 30421 includes at least one isolation device. Isolation devices include, but are not limited to, optocouplers, relays, and level conversion circuits.

[0114] The second circuit 305 is used to convert the signal from the high-pressure switch 200 on the main control board 100 into a digital or analog signal recognizable by the variable frequency drive board 300, thereby enabling the drive control unit 302 to monitor the status of the high-pressure switch 200. Optionally, the second circuit 305 includes at least one isolation device. Isolation devices include, but are not limited to, optocouplers, relays, and level conversion circuits.

[0115] In some embodiments, please combine Figure 1 and Figure 2 The drive control unit 302 is electrically connected to the switch control circuit 30422, the load working module 303 includes a drive circuit 3031 and a power circuit 3032, the drive circuit 3031 is electrically connected to the drive control unit 302 and the power switch 3041, and the power circuit 3032 is electrically connected to the drive circuit 3031 and the load 3000.

[0116] The drive control unit 302 is used to control the operation of the power switch 3041 by controlling the switch control circuit 30422 after the control system 1000 is powered on, and in the event of an abnormality in the power switch 3041, control the control system 1000 to issue an alarm and stop sending the PWM control signal to the drive circuit 3031 to stop the drive circuit 3031 from working and thereby stop the power circuit 3032 from supplying power to the load 3000.

[0117] In the above embodiment, the power switch 3041 can be self-checked when powered on, so as to promptly detect whether there is any abnormality in the power switch 3041 , thereby improving the safety, stability and reliability of the control system 1000 .

[0118] Specifically, powering on the control system 1000 means switching from a power-off state (i.e., a state without power supply) to a power-on state, and the various circuits of the control system 1000 begin to be energized and enter a ready-to-operate state or a fully operational state. For example, when the air conditioning system 2000 is plugged into the mains, the control system 1000 receives power from the mains. This moment is called "powering on."

[0119] After the control system 1000 is powered on, the drive control unit 302 can control the power switch 3041 to close and open, and at the same time detect whether the power switch 3041 is abnormal through the second connection state input-2. When the power switch 3041 is abnormal, the control system 1000 issues an alarm and stops sending the PWM control signal to the drive circuit 3031, causing the drive circuit 3031 to stop working and then causing the power circuit 3032 to stop supplying power to the load 3000.

[0120] In one embodiment, the drive control unit 302 controls the power switch 3041 by controlling the switch control circuit 30422 to open and then close. At this time, the second connection state input-2 should also first display open and then close. If the second connection state input-2 does not reflect the corresponding state change, it indicates that the power switch 3041 may be in an abnormal state such as sticking or short circuit.

[0121] In one embodiment, after the control system 1000 is powered on, the main control unit 101 obtains the first connection status input-1, and the drive control unit 302 obtains the second connection status input-2 and the third connection status input-3. The drive control unit 302 may send the obtained second connection status input-2 and third connection status input-3 to the main control unit 101. The main control unit 101 may determine whether the control system 1000 is abnormal based on the first connection status input-1, the second connection status input-2, and the third connection status input-3.

[0122] When any two of the first connection state, the second connection state and the third connection state are different, the driving control unit 302 is used to control the switch control circuit 30422 to disconnect the power switch 3041 and power off the load working module 303.

[0123] When any two of the first connection state, the second connection state and the third connection state are the same, the driving control unit 302 can control the power switch 3041 to be closed and opened, and detect whether the power switch 3041 is abnormal through the second connection state input-2.

[0124] In some embodiments, please combine Figure 1 and Figure 2 The control system 1000 is used to issue an alarm when the pressure of the air-conditioning system 2000 is greater than the set pressure.

[0125] In the above implementation, users or operation and maintenance personnel can be reminded, thereby improving the security of the control system 1000.

[0126] Specifically, when the pressure of the air-conditioning system 2000 is greater than the set pressure, the control system 1000 may determine that the pressure of the air-conditioning system 2000 is too high. At this time, the control system 1000 may actively send an alarm signal to remind the user or operation and maintenance personnel.

[0127] Optionally, the set pressure can be determined by experimental testing, simulation analysis, or other methods based on the parameters and safety requirements of the air conditioning system 2000, and is not specifically limited in the embodiments of the present invention. It can be understood that the set pressure is the maximum pressure at which the air conditioning system 2000 can operate normally for a long period of time.

[0128] In some embodiments, the high-pressure switch 200 is connected to the main control board 100 and the variable frequency drive board 300 via weak electricity, and the main control board 100 is connected to the variable frequency drive board 300 via weak electricity.

[0129] In the above implementation, the security of the control system 1000 can be improved.

[0130] Specifically, a weak current connection uses a low-voltage and low-current path to achieve functions such as communication, control command transmission, and status feedback. Because weak current connections do not carry high-power currents, they can be used for logic analysis, status feedback, and the transmission of control commands.

[0131] In the control system 1000, the high-pressure switch 200 is connected to the main control board 100 and the variable frequency drive board 300 via a weak electrical connection. In other words, low-voltage signals are used to communicate and provide status feedback between the high-pressure switch 200, the main control board 100, and the variable frequency drive board 300. The main control board 100 and the variable frequency drive board 300 are connected via a weak electrical connection. In other words, low-voltage signals are used to communicate between the main control board 100 and the variable frequency drive board 300.

[0132] An air conditioning system 2000 according to an embodiment of the present invention includes the control system 1000 according to any one of the above embodiments and a load 3000 , and the load working module 303 is connected to the load 3000 .

[0133] Specifically, please combine Figure 3The air conditioning system 2000 is a system for regulating the temperature, humidity, cleanliness, wind speed, and airflow distribution of air in an enclosed space. The air conditioning system 2000 may include, but is not limited to, a compressor 20, a condenser, an evaporator, an expansion valve 50, a refrigerant circuit, a fan assembly 60, and a control system 1000. The compressor 20, condenser, evaporator, and expansion valve 50 may be connected via refrigerant pipes to form a refrigerant circuit, and the refrigerant may circulate in the refrigerant pipes. The fan assembly 60 may be used to drive air flow, enhance heat exchange, and accelerate heat transfer. The control system 1000 may be used to perform real-time monitoring, logical judgment, anomaly detection, and control management of the air conditioning system 2000, thereby ensuring, to a certain extent, the stability and safety of the air conditioning system 2000 under different operating conditions.

[0134] Please combine Figure 1 and Figure 2 The control system 1000 includes a load operating module 303, which is electrically connected to a load 3000. Optionally, in one embodiment, the load 3000 includes a motor for the compressor 20. In one embodiment, the load 3000 includes motors for the compressor 20 and the fan assembly 60. In other embodiments, the load 3000 may be another load 3000 that causes a pressure increase in the air conditioning system 2000.

[0135] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0136] Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A control system for an air conditioning system, characterized in that: It includes a main control board, a variable frequency drive board and a high-voltage pressure switch, the variable frequency drive board includes a driving power supply and a load working module, the load working module is used to connect to the load, the driving power supply is used to provide a driving voltage to the load working module, the high-voltage pressure switch is electrically connected to the main control board and the variable frequency drive board, and the main control board is electrically connected to the variable frequency drive board; When the pressure of the air-conditioning system is greater than the set pressure, the high-pressure switch is disconnected to disconnect the driving power supply from the load working module, thereby shutting down the load.

2. The control system according to claim 1, characterized in that: The variable frequency drive board includes a power control module, which includes a control module and a power switch. The control module is electrically connected to the high-pressure pressure switch and the power switch, and the power switch is connected between the load working module and the driving power supply. The control module is used to detect the connection status of the high-pressure pressure switch, and when the high-pressure pressure switch is in a closed state, control the power switch to close to power on the load working module; when the high-pressure pressure switch is in an open state, control the power switch to open to power off the load working module.

3. The control system according to claim 2, characterized in that: The control module includes a first circuit and a switch control circuit, the first circuit is electrically connected to the high-pressure pressure switch and the switch control circuit, and the switch control circuit is electrically connected to the power switch; The first circuit is configured to output a first control signal to enable the switch control circuit to control the power switch to be closed when the high-pressure switch is in a closed state; The first circuit is used to stop working when the high-pressure pressure switch is in the disconnected state so that the switch control circuit controls the power switch to be disconnected.

4. The control system according to claim 3, characterized in that: The variable frequency drive board includes a drive control unit, which is electrically connected to the main control board and the power control module; The main control board is used to obtain the first connection state of the high-pressure pressure switch; The driving control unit is configured to obtain a second connection state of the high-pressure pressure switch through the power control module; When the first connection state and the second connection state are different, the drive control unit is used to control the switch control circuit to disconnect the power switch, so as to cut off the power supply of the load working module; The connection state of the high-pressure pressure switch includes an open state and a closed state.

5. The control system according to claim 4, characterized in that: The variable frequency drive board further includes a second circuit, which is electrically connected to the high-pressure pressure switch and the drive control unit; The driving control unit is configured to obtain a third connection state of the high-pressure switch through the second circuit; When any two of the first connection state, the second connection state and the third connection state are different, the drive control unit is used to control the switch control circuit to disconnect the power switch, thereby powering off the load working module.

6. The control system according to claim 4 or 5, characterized in that: The driving control unit is configured to control the load working module to stop supplying power to the load when it detects that the load is still in a working state after controlling the power switch to be turned off.

7. The control system according to claim 5, characterized in that: The control system is configured to issue an alarm when any two of the first connection state, the second connection state, and the third connection state are different.

8. The control system according to claim 6, characterized in that: The load working module includes a drive circuit and a power circuit, the drive circuit is electrically connected to the drive control unit and the power switch, and the power circuit is electrically connected to the drive circuit and the load; The drive control unit is used to send a PWM control signal to the drive circuit to make the drive circuit work and thus make the power circuit supply power to the load, and stop sending the PWM control signal to the drive circuit to make the drive circuit stop working and thus make the power circuit stop supplying power to the load.

9. The control system according to claim 5, characterized in that: The control module includes a first circuit and a switch control circuit, the switch control circuit is electrically connected to the first circuit and the power switch, the first circuit and the second circuit are electrically connected to the main control board through a first weak current signal line, and the drive control unit is electrically connected to the main control board through a second weak current signal line.

10. The control system according to claim 4, characterized in that: The drive control unit is electrically connected to the switch control circuit, the load working module includes a drive circuit and a power circuit, the drive circuit is electrically connected to the drive control unit and the power switch, and the power circuit is electrically connected to the drive circuit and the load; The drive control unit is used to control the operation of the power switch by controlling the switch control circuit after the control system is powered on, and in the event of an abnormality in the power switch, control the control system to issue an alarm and stop sending PWM control signals to the drive circuit to stop the drive circuit from working and thereby stop the power circuit from supplying power to the load.

11. The control system according to claim 1, characterized in that: The control system is used to issue an alarm when the pressure of the air-conditioning system is greater than the set pressure.

12. The control system according to claim 1, characterized in that: The high-pressure switch is connected to the main control board and the variable frequency drive board via weak electricity, and the main control board is connected to the variable frequency drive board via weak electricity.

13. An air conditioning system, characterized in that: The system comprises the control system and a load according to any one of claims 1 to 12, wherein the load working module is connected to the load.

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