An air conditioning unit

Abstract

An embodiment of the present invention provides an air-conditioning unit, which relates to the field of electrical appliance technology. The air-conditioning unit protects the air-conditioning unit by judging whether the power line is suitable in a high-current mode. The above-mentioned air-conditioning unit includes: an indoor unit and an outdoor unit; the air-conditioning unit is electrically connected to the power supply through a first power line; the indoor unit and the outdoor unit are electrically connected through a second power line; the power supply supplies power to the air-conditioning unit; the outdoor unit includes a driver board; the driver board includes: a power input interface, a microcontroller and a current and voltage detection device; the power input interface is connected to the second power line, the current and voltage detection device is electrically connected to the power input interface, and the microcontroller is electrically connected to the current and voltage detection device; the current and voltage detection device is configured to detect the voltage and current of the input driver board and transmit the detected data to the microcontroller; the microcontroller is configured to: in a high-current mode, judge whether the power line is suitable and issue an alarm for a power line that does not meet the requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and in particular to an air-conditioning unit. Background Art

[0002] With the development of science and technology, the application of air conditioners has become more and more common, and the daily lives of more and more people are closely related to air conditioners.

[0003] Currently, for one-to-one unit units using current loop communication, the market requires a power supply configuration that facilitates power supply: the power supply provides power to the indoor unit, which then switches the power supply to the outdoor unit, with the two units sharing a common neutral line to achieve current loop communication. If the power cord selected from a factory is too thin, the voltage drop across the cord will be too large, resulting in lower voltage inputs to the indoor and outdoor units. At the same power level, the outdoor unit will draw higher current. This can trigger the system's current protection function at best, limiting overall capacity or causing a shutdown. In worse cases, it can cause the terminal block to overheat, potentially damaging the terminal block and driver board. Therefore, it's necessary to carefully assess the power cord's diameter and issue an alert if it doesn't meet these requirements. Summary of the Invention

[0004] An embodiment of the present invention provides an air-conditioning unit, wherein an outdoor unit of the air-conditioning unit performs real-time detection in a high-current mode by using a current and voltage detection device.

[0005] The air-conditioning unit includes: an indoor unit and an outdoor unit; the air-conditioning unit is electrically connected to a power supply through a first power line; the indoor unit and the outdoor unit are electrically connected through a second power line; the power supply supplies power to the air-conditioning unit; the outdoor unit includes a drive board; the drive board includes: a power input interface, a microcontroller and a current and voltage detection device; the power input interface is connected to the second power line, the current and voltage detection device is electrically connected to the power input interface, and the microcontroller is electrically connected to the current and voltage detection device; the current and voltage detection device is configured to detect the voltage and current of the input drive board, and transmit the detected data to the microcontroller.

[0006] The microcontroller is configured to receive a first voltage input to the outdoor unit detected by the current and voltage detection device when the air conditioning unit is in a standby state.

[0007] When the outdoor unit is in standby mode and the indoor unit is in high current mode, the second voltage detected by the current and voltage detection device is received, the difference between the first voltage and the second voltage is calculated as a first voltage drop, and the first voltage drop is compared with a preset maximum voltage drop of the first power line. When the first voltage drop is greater than the maximum voltage drop of the first power line, the air-conditioning unit is controlled to alarm; wherein, the current generated by the indoor unit in the high current mode is a set current, and the set current is less than the maximum current allowed to be generated by the air-conditioning unit.

[0008] When the indoor unit is in standby mode and the outdoor unit is in high current mode, the third voltage detected by the current and voltage detection device is received, the difference between the second voltage and the third voltage is calculated as a second voltage drop, and the second voltage drop is compared with a preset maximum voltage drop of the second power line. When the second voltage drop is greater than the maximum voltage drop of the second power line, the air-conditioning unit is controlled to alarm; wherein, the current generated by the outdoor unit in the high current mode is the set current.

[0009] In some embodiments, the maximum voltage drop of the first power cord is: the voltage drop generated on the first power cord when the length of the first power cord is a first length, the wire diameter of the first power cord is the minimum wire diameter allowed for the air-conditioning unit, and the current flowing through the first power cord is a set current; wherein the first length is the length corresponding to the maximum distance between the power supply and the air-conditioning unit.

[0010] The maximum voltage drop of the second power cord is: the voltage drop generated on the second power cord when the length of the second power cord is the second length, the wire diameter of the second power cord is the minimum wire diameter allowed for the air-conditioning unit, and the current flowing through the second power cord is the set current; wherein the second length is the length corresponding to the maximum distance between the indoor unit and the outdoor unit.

[0011] In some embodiments, the driving board further includes a memory; the memory is electrically connected to the microcontroller, and the memory is used to store the first voltage drop and the second voltage drop.

[0012] In some embodiments, the indoor unit includes an indoor fan, and the indoor fan includes a motor. When the indoor unit is in a high current mode, the motor of the indoor fan does not operate.

[0013] In some embodiments, the fan includes a motor, which includes a main winding, a secondary winding, a starting capacitor and a switch; the capacitor is connected in parallel with the switch; the first end of the main winding is electrically connected to the first end of the capacitor, the second end of the main winding is electrically connected to the first end of the secondary winding, and the second end of the secondary winding is electrically connected to the second end of the capacitor; the first end of the main winding is also electrically connected to the power supply end, and the second end of the main winding is also electrically connected to the current output end; when the switch is closed, the motor generates the set current.

[0014] In some embodiments, the power supply voltage detection device includes a power factor correction module and a switching converter; the power factor correction module is electrically connected to the power input interface, the first end of the switching converter is electrically connected to the power factor correction module, and the second end of the switching converter is electrically connected to the microcontroller.

[0015] In some embodiments, the outdoor unit includes a compressor, and when the outdoor unit is in a high current mode, the compressor operates at a high load.

[0016] In some embodiments, the outdoor unit also includes an outdoor fan, and the control board also includes a fan intelligent power module and a compressor intelligent power module. The fan intelligent power module is electrically connected to the microcontroller and the outdoor fan, respectively, and the compressor intelligent power module is electrically connected to the microcontroller and the compressor, respectively; the microcontroller controls the fan intelligent power module and the compressor intelligent power module through pulse width modulation, and the compressor intelligent power module adjusts the operating frequency of the compressor.

[0017] In some embodiments, the switching converter is electrically connected to the fan intelligent power module and the compressor intelligent power module, respectively; the switching converter is configured to convert the voltage of the received power supply into a first voltage suitable for the fan intelligent power module and the compressor intelligent power module, and provide the first voltage to the fan intelligent power module and the compressor intelligent power module.

[0018] In some embodiments, the driving board also includes an external air sensor, which is electrically connected to the microcontroller. The external air sensor is configured to detect the outdoor ambient temperature in real time and transmit the temperature data to the microcontroller; the microcontroller is configured to control the outdoor fan not to run when the outdoor ambient temperature is greater than or equal to the set temperature, and to control the outdoor fan to run when the outdoor ambient temperature is lower than the set temperature.

[0019] Based on the above technical solution, some embodiments of the present invention provide an air-conditioning unit that uses a current and voltage detection device to detect the voltage and current of the input driver board in real time, and transmits the detected data to a microcontroller. The microcontroller will judge whether the power line is suitable based on the received data, and thus make corresponding instructions to better protect the normal operation of the air-conditioning unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0021] Figure 1 A system block diagram of an air-conditioning unit provided by an embodiment of the present invention;

[0022] Figure 2 A system block diagram of an air conditioning unit with a power supply provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of an air conditioning unit with a power supply provided in an embodiment of the present invention;

[0024] Figure 4A A structural block diagram of a part of the outdoor unit drive board provided by an embodiment of the present invention;

[0025] Figure 4B Another structural block diagram of a portion of an outdoor unit drive board provided by an embodiment of the present invention;

[0026] Figure 5A A system block diagram of an indoor unit provided by an embodiment of the present invention;

[0027] Figure 5B A circuit diagram of an indoor unit motor provided by an embodiment of the present invention;

[0028] Figure 6 A diagram of a drive board frame of an outdoor unit provided by an embodiment of the present invention;

[0029] Figure 7 Another outdoor unit drive board frame diagram provided by an embodiment of the present invention;

[0030] Figure 8 A flow chart of a power line monitoring mode between a power source and an air conditioning unit provided in an embodiment of the present invention;

[0031] Figure 9 A flow chart of a power line monitoring mode between an indoor unit and an outdoor unit provided in an embodiment of the present invention;

[0032] Figure 10A flow chart of a power line monitoring mode provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connect" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "connected" in the present invention have the meaning of conducting electricity. Their specific meanings should be understood in the context.

[0037] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0038] As described in the background technology, the current power supply method for air conditioning units is as follows: the power supply supplies power to the indoor unit of the air conditioning unit, and the indoor unit then transfers the power to the outdoor unit. At the same time, the indoor and outdoor units share a neutral line to achieve current loop communication. If the power line connected to the air conditioning unit is too thin and the resistance of the power line is large, it will cause the voltage drop of the power line to be too large, and the voltage input to the indoor and outdoor units will be too low. As shown by P=UI, when the power remains unchanged, the lower the voltage, the greater the current; therefore, at the same power, if the current of the outdoor unit is too high, it will cause the current protection of the entire air conditioning unit to be triggered, resulting in limited capacity or shutdown protection of the entire unit. In serious cases, it will cause the terminal block to generate too much heat, burning the terminal block and the driver board.

[0039] It's important to note that a current loop refers to a current feedback system, generally referring to a method whereby the output current is fed into a processing stage using positive or negative feedback. This method primarily aims to improve system performance by enhancing current stability. A current loop communication circuit carries signals on the current loop to achieve long-distance signal transmission. Often, the current loop and the neutral line (N line) of the AC power supply share a common-neutral line, creating a common-neutral current loop communication circuit.

[0040] Based on this, an embodiment of the present invention provides an air-conditioning unit, in which the outdoor unit drive board in the air-conditioning unit includes a current and voltage detection device, which detects the voltage and current of the input drive board in real time and transmits the detected data to a microcontroller. The microcontroller will make corresponding instructions based on the received data, thereby better protecting the air-conditioning unit.

[0041] like Figure 1 As shown, an embodiment of the present invention provides an air conditioning unit, the air conditioning unit 1000 includes: an indoor unit 100 and an outdoor unit 200; Figure 2 The air conditioning unit 1000 is electrically connected to the power supply 300 via a first power line 400, and the indoor unit 100 is electrically connected to the outdoor unit 200 via a second power line 500. The power supply 300 supplies power to the air conditioning unit 1000.

[0042] like Figure 3 As shown, Figure 3 2 is a diagram of a power supply method for an air conditioning unit, wherein the power lines include: a first power line 400 from a power source 300 to the air conditioning unit 1000 and a second power line 500 from the indoor unit 100 to the outdoor unit 200.

[0043] It should be noted that a power cord is an electrical wire that transmits electric current. Current transmission is typically point-to-point. A power cord typically has three cores: a live wire, a neutral wire, and a ground wire. The wire diameter of the power cord refers to its diameter. A larger wire diameter corresponds to a larger diameter and a larger cross-sectional area. The air conditioning unit transmits electrical signals from the power supply 300 to the indoor and outdoor units via the first and second power cords.

[0044] like Figure 4A The figure shows a block diagram of the outdoor unit drive board structure provided by an embodiment of the present application. The outdoor unit 200 includes a drive board 2, which includes a power input interface 20, a microcontroller 21, and a current and voltage detection device 22. The power input interface 20 is electrically connected to the second power line 500, the current and voltage detection device 22 is electrically connected to the power input interface 20, and the microcontroller 21 is electrically connected to the current and voltage detection device 22. The current and voltage detection device 22 is configured to detect the voltage and current input to the drive board 2 and transmit the detected data to the microcontroller 21.

[0045] The microcontroller 21 is configured to receive the first voltage U1 input to the outdoor unit 200 detected by the current and voltage detection device 22 when the air conditioning unit 1000 is in a standby state.

[0046] When the outdoor unit is in standby mode and the indoor unit is in high current mode, the second voltage U2 detected by the current and voltage detection device 22 is received, the difference between the first voltage U1 and the second voltage U2 is calculated as the first voltage drop ζ1, and the first voltage drop ζ1 is compared with the preset maximum voltage drop ζ1' of the first power line. When the first voltage drop ζ1 is greater than the maximum voltage drop ζ1' of the first power line 400, the air-conditioning unit 1000 is controlled to alarm; wherein, the current generated by the indoor unit 100 in the high current mode is the set current i, and the set current i is less than the limited current I of the air-conditioning unit.

[0047] When the indoor unit 100 is in standby mode and the outdoor unit 200 is in high current mode, the third voltage U3 detected by the receiving current and voltage detection device 22 is calculated, the difference between the second voltage U2 and the third voltage U3 is calculated as the second voltage drop ζ2, and the second voltage drop ζ2 is compared with the preset maximum voltage drop of the second power line 500. When the second voltage drop ζ2 is greater than the maximum voltage drop ζ2' of the second power line, the air-conditioning unit 1000 is controlled to alarm; wherein, the current generated by the outdoor unit 200 in the high current mode is the set current i.

[0048] It should be noted that the current and voltage detection device 22 is located on the outdoor unit's drive board 2. Therefore, the first, second, and third voltages detected by the current and voltage detection device 22 are all voltages at the outdoor unit end. When the entire air conditioning unit is operating, current flows between the first and second power lines. Due to the voltage drop between the first and second power lines, the voltage at the power supply end, the voltage at the indoor unit end, and the voltage at the outdoor unit end are all different. When the air conditioning unit is in standby mode, or when one of the outdoor and indoor units is in standby mode, it is necessary to analyze whether a voltage drop occurs on the corresponding power line to determine the voltage at the power supply end / indoor unit end.

[0049] In the above-described embodiment of the present application, when the air conditioning unit 1000 is in the standby mode, the current and voltage detection device 22 on the driver board 2 of the outdoor unit 200 monitors the voltage input to the outdoor unit 200 as a first voltage U1. Since the current of the entire air conditioning unit is very low in the standby mode, typically at the mA level, the voltage drop on the first power line and the second power line is almost negligible. There is almost no loss when the power supply transmits the electrical signal to the outdoor unit via the first power line and the second power line, and the first voltage U1 is equivalent to the power supply voltage.

[0050] When the indoor unit is in non-high current mode, the current of the indoor unit is generally small, and the impact on the power line is small. Affected by the voltage sampling accuracy of the outdoor unit, the voltage drop of the power line cannot be accurately judged. Therefore, the indoor unit needs to generate a relatively large current to ensure the voltage sampling accuracy.

[0051] When the indoor unit 100 is in the high current mode, the outdoor unit 200 is in the standby state. Since the outdoor unit is in the standby state and is not working at this time, there is no high current between the indoor unit and the outdoor unit. The high current here refers to the current with a large amplitude (set current) generated in the high current mode. The second voltage U2 is equivalent to the voltage of the indoor unit. The difference between the first voltage U1 and the second voltage U2 is calculated as the first voltage drop, that is, ζ1=U1-U2; at this time, it is necessary to compare the first voltage drop ζ1 with the pre-set maximum voltage drop ζ1' of the first power line 400.

[0052] If ζ1 ≥ ζ1', the voltage drop on the first power line 400 exceeds the specified range. The air conditioning unit 1000 will then trigger an alarm, prompting staff to replace the first power line 400 between the power supply 300 and the air conditioning unit 1000. If ζ1 < ζ1', the voltage drop on the first power line 400 does not exceed the specified range, meeting the requirements for normal operation of the air conditioning unit. No action is taken.

[0053] When the indoor unit 100 is in standby mode and the outdoor unit 200 is in high current mode, the current and voltage detection device 22 on the drive board 2 of the outdoor unit 200 monitors that the voltage input to the outdoor unit 200 is the third voltage U3. At this time, the voltage of the indoor unit 100 is the second voltage U2. The difference between the second voltage U2 and the third voltage U3 is calculated as the second voltage drop ζ2, that is, ζ2 = U2-U3; at this time, it is necessary to compare the second voltage drop ζ2 with the preset maximum voltage drop ζ2' of the second power line 500.

[0054] If ζ2 ≥ ζ2', the voltage drop on the second power line 500 exceeds the specified range. The air conditioner 1000 will then sound an alarm, prompting staff to replace the second power line 500 between the indoor unit 100 and the outdoor unit 200. If ζ2 < ζ2', the voltage drop on the second power line 500 does not exceed the specified range, meeting the requirements for normal operation of the air conditioner. No action is taken.

[0055] It should be noted that the above two large current modes are both based on the set current i. At the same time, the maximum current allowed to be generated by the air-conditioning unit refers to the maximum current that the air-conditioning unit can withstand, that is, the safety protection current.

[0056] In summary, the two power line monitoring modes prevent the entire air conditioner from triggering current protection when the power line is unsuitable, thus preventing capacity restrictions or system shutdowns. Consequently, excessive heating of the terminal blocks and the resulting burnout of the terminal blocks and driver boards is avoided, allowing the air conditioner to be further utilized and maximized.

[0057] In some embodiments, the maximum voltage drop of the first power cord 400 is: the voltage drop generated on the first power cord when the length of the first power cord is a first length, the wire diameter of the first power cord is the minimum wire diameter allowed for the air-conditioning unit, and the current flowing through the first power cord is a set current; wherein the first length is the length corresponding to the maximum distance between the power supply and the air-conditioning unit.

[0058] The maximum voltage drop of the second power cord 500 is: the voltage drop generated on the second power cord when the length of the second power cord is the second length, the wire diameter of the second power cord is the minimum wire diameter allowed for the air-conditioning unit, and the current flowing through the second power cord is the set current; wherein the second length is the length corresponding to the maximum distance between the indoor unit and the outdoor unit.

[0059] The above setting can be seen from the formula R=ρL / S. The length of the power cord is proportional to the resistance, and the wire diameter of the power cord is inversely proportional to the resistance. In other words, the longer the power cord, the greater the resistance, and the smaller the wire diameter, the greater the resistance. If the two variables of the longer power cord and the smaller the wire diameter change at the same time, the resistance of the power cord is the largest at this time. From the formula R=U / I, it can be seen that the greater the resistance, the greater the voltage, that is, the greater the voltage drop.

[0060] like Figure 4B As shown, in the embodiment of the present application, the driver board 2 further includes a memory 23; the memory 23 is electrically connected to the microcontroller 21, and the memory 23 is used to store a preset maximum voltage drop ζ1' of the first power line and a preset maximum voltage drop ζ2' of the second power line.

[0061] When the microcontroller is working, it is necessary to compare the first voltage drop ζ1 with the preset maximum voltage drop ζ1' of the first power line. At this time, it is necessary to call the memory 23 to store the preset maximum voltage drop ζ1' of the first power line; it is also necessary to compare the second voltage drop ζ2 with the preset maximum voltage drop ζ2' of the second power line. At this time, it is necessary to call the memory 23 to store the preset maximum voltage drop ζ2' of the second power line.

[0062] like Figure 5A and Figure 5B As shown, Figure 5B This is a circuit diagram of an indoor unit motor in an embodiment of the present application. Figure 5A In the embodiment, the indoor unit 100 includes an indoor fan 100 ′, and the indoor fan 100 ′ includes a motor 1 . Figure 5B In the figure, the motor 1 includes a main winding 13, a secondary winding 14, a starting capacitor 12 and a switch 11; the starting capacitor 12 is connected in parallel with the switch 11; the first end of the main winding 13 is electrically connected to the first end of the starting capacitor 12, the second end of the main winding 13 is electrically connected to the first end of the secondary winding 14, and the second end of the secondary winding 14 is electrically connected to the second end of the starting capacitor 12.

[0063] The monitoring mode of the first power line is that the indoor unit is in high current mode and the outdoor unit is in standby mode. The following details how to put the indoor unit in high current mode.

[0064] When the switch 11 is turned on, the motor 1 operates normally, and the current of the indoor unit 100 is generally small.

[0065] When the switch 11 is closed, the motor is in a state where the main winding 13 and the auxiliary winding 14 are connected in parallel, the motor does not run, and can generate a continuous set current.

[0066] That is, if the switch 11 is open, current is input through the common terminal and only passes through the main winding 13. The main winding 13 can be regarded as a resistor, and the current of the indoor unit 100 is relatively low. If the switch 11 is closed, current is input through the common terminal, and the main winding 13 and the secondary winding 14 are connected in parallel. The main winding 13 and the secondary winding 14 can be regarded as two resistors in parallel, and the total resistance is reduced, thereby increasing the current of the indoor unit 100. In other words, the indoor unit enters the high current mode. At the same time, because the main winding 13 and the secondary winding 14 are connected in parallel, the starting capacitor 12 is short-circuited, and the motor 1 does not operate.

[0067] It should be noted that, when the indoor unit 100 is in the high current mode, the motor 1 of the indoor fan 100 ′ does not operate.

[0068] When the voltage is constant, the larger the resistance, the smaller the current. The magnitude of the current corresponds to different gears of the motor, such as the high wind gear, medium wind gear and low wind gear in Figure 5.

[0069] In some embodiments, the indoor unit is a ducted unit.

[0070] In some embodiments, the motor is a single-phase capacitor-run asynchronous motor.

[0071] Single-phase capacitor-operated asynchronous motors are referred to as capacitor motors. When these motors are running, their secondary windings are also connected to the grid and operate simultaneously. With proper design, the motors can operate in a circular rotating magnetic field for a given load.

[0072] In some embodiments, as Figure 6 As shown, the driver board 2 includes: a microcontroller 21, a power factor correction module 221, a switching converter 222, a memory 23, a power input interface 24, a sensor module 25, a compressor intelligent power module 26, a fan drive 27', a switch module 28 and a high-voltage module 29.

[0073] like Figure 6 As shown, the high-voltage module 29 includes: an AC motor, a four-way valve, a heating belt, a current loop communication, an electromagnetic compatibility filter, a rectifier bridge and an inductor. The above modules all work under high voltage.

[0074] The first end of the above-mentioned microcontroller 21 is electrically connected to the first end of the high-voltage module 29; the second end of the microcontroller 21 is electrically connected to the memory 23; the third end of the microcontroller 21 is electrically connected to the second end of the switching converter 222; the fourth end of the microcontroller 21 is electrically connected to the compressor intelligent power module 26; the fifth end of the microcontroller 21 is electrically connected to the fan drive 27'; the sixth end of the microcontroller 21 is electrically connected to the sensor 25; the seventh end of the microcontroller 21 is electrically connected to the switching module 28; the first end of the power factor correction module 221 is electrically connected to the second end of the high-voltage module 29; the second end of the power factor correction module 221 is electrically connected to the first end of the switching converter 222; and the power input interface 24 is electrically connected to the third end of the high-voltage module 29.

[0075] The switching converter 222 provides appropriate voltages to the sensor module 25 , the compressor intelligent power module 26 , and the switch module 28 .

[0076] In other embodiments, Figure 7 As shown, the outdoor unit 200 also includes an outdoor fan, and the drive board 2 also includes a fan intelligent power module 27. The fan intelligent power module is electrically connected to the microcontroller 21 and the outdoor fan, respectively, and the compressor intelligent power module 26 is electrically connected to the microcontroller 21 and the compressor, respectively; the microcontroller 21 controls the fan intelligent power module 27 and the compressor intelligent power module 26 through pulse width modulation, and the compressor intelligent power module 26 adjusts the operating frequency of the compressor.

[0077] When the outdoor unit activates high-current mode, it achieves this by operating the compressor at high load. In this mode, the indoor unit is in standby mode, and the fan is not running. Since the indoor unit is not running, the outdoor unit is not operating normally. This situation requires addressing the potential damage to the compressor caused by high-current control mode. Replacing the fan driver 27' with a fan intelligent power module 27 prevents compressor damage and ensures normal operation in high-current mode.

[0078] like Figure 6 and Figure 7 As shown, the above-mentioned power supply voltage detection device 22 includes a power factor correction module 221 and a switching converter 222; the power factor correction module 221 is electrically connected to the power input interface 24, the first end of the switching converter 222 is electrically connected to the power factor correction module 221, and the second end of the switching converter 222 is electrically connected to the microcontroller 21.

[0079] In some embodiments, the outdoor unit 200 includes a compressor. When the outdoor unit 200 is in a high current mode, the compressor operates at a high load.

[0080] The switching converter 222 is electrically connected to the fan intelligent power module 27 and the compressor intelligent power module 26 respectively; the switching converter 222 is configured to convert the voltage of the received power supply into a first voltage suitable for the fan intelligent power module 27 and the compressor intelligent power module 26, and provide the first voltage to the fan intelligent power module and the compressor intelligent power module.

[0081] like Figure 7 As shown, the sensor module 25 includes an outside air sensor 251, a pipe sensor 252, and a pressure sensor 253. The outside air sensor 251 is electrically connected to the microcontroller 21. The outside air sensor 251 is configured to detect the outdoor ambient temperature in real time and transmit the temperature data to the microcontroller 21.

[0082] The microcontroller 21 is configured to control the outdoor fan to not operate when the outdoor ambient temperature is greater than or equal to a set temperature, and to control the outdoor fan to operate when the outdoor ambient temperature is less than the set temperature.

[0083] In some embodiments, the outdoor unit's outdoor air temperature sensor 251 monitors the outdoor ambient temperature Ta in real time. When Ta ≥ 20°C, the outdoor unit enters cooling mode. In this mode, the outdoor fan also stops running to ensure that the refrigerant in the system is in a gaseous state and prevent liquid backflow from damaging the compressor. When Ta < 20°C, the outdoor unit enters heating mode, in which the outdoor fan runs. Current closed-loop control automatically adjusts the compressor's operating frequency to maintain the input current i at the set value.

[0084] In some embodiments, the driving board 2 may also be provided with some reserved sensors.

[0085] like Figures 8 to 10 FIG. 1 is a flow chart of a power line monitoring mode provided by an embodiment of the present invention. Figure 8 This is the flow chart of the power line monitoring mode between the power supply and the air conditioning unit. Figure 9 This is a flow chart of the power line monitoring mode between the indoor unit and the outdoor unit.

[0086] like Figure 8 and Figure 10As shown, when the air conditioning unit 1000 is in standby mode, it receives a first voltage input to the outdoor unit 200 detected by the current and voltage detection device 22. The microcontroller first controls whether the switch 11 of the motor 1 is closed. When the switch 11 is off, the motor 1 operates normally, and the current drawn by the indoor unit 100 is generally low. When the switch 11 is closed, the motor's main winding 13 and secondary winding 14 are connected in parallel, the motor is not running, and can generate a continuous set current. At this point, the indoor unit is in high-current mode, and the outdoor unit is in standby mode. The microcontroller receives a second voltage U2 detected by the current and voltage detection device 22. The microcontroller calculates the difference between the first voltage U1 and the second voltage U2 as a first voltage drop ζ1, and compares the first voltage drop ζ1 with the preset maximum voltage drop ζ1' of the first power line. If ζ1 ≥ ζ1', the voltage drop on the first power line 400 exceeds the specified range. The air conditioning unit 1000 then issues an alarm, prompting personnel to replace the first power line 400 between the power supply 300 and the air conditioning unit 1000. If ζ1<ζ1′, it means that the voltage drop of the first power line 400 does not exceed the range and meets the requirements for normal operation of the air-conditioning unit, and no processing is performed.

[0087] like Figure 9 and Figure 10 As shown, when the indoor unit 100 is in standby mode and the outdoor unit 200 is in high-current mode, the outdoor unit's outdoor air temperature sensor 251 monitors the outdoor ambient temperature Ta in real time. When Ta ≥ 20°C, the outdoor unit enters cooling mode. In this mode, the outdoor fan also stops operating to ensure that the refrigerant in the system is in a gaseous state and prevent liquid backflow from damaging the compressor. When Ta < 20°C, the outdoor unit enters heating mode, in which the outdoor fan operates. Through current closed-loop control, the compressor's operating frequency is automatically adjusted to ensure that the current input to the outdoor unit is the set current i. When Ta < 20°C, the microcontroller receives the third voltage U3 detected by the current-voltage detection device 22, calculates the difference between the second voltage U2 and the third voltage U3 as the second voltage drop ζ2, and compares the second voltage drop ζ2 with the preset maximum voltage drop of the second power line 500. If ζ2 ≥ ζ2', the voltage drop of the second power line 500 exceeds the specified range. The air conditioning unit 1000 then issues an alarm, prompting personnel to replace the second power line 500 between the indoor unit 100 and the outdoor unit 200. If ζ2<ζ2′, it means that the voltage drop of the second power line 500 does not exceed the range and meets the requirements for normal operation of the air-conditioning unit, and no action is taken.

[0088] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioning unit, characterized in that: include: Indoor and outdoor units; The air conditioning unit is electrically connected to the power supply via a first power line; The indoor unit and the outdoor unit are electrically connected via a second power line; The power supply supplies power to the air conditioning unit; The outdoor unit includes a drive board; the drive board includes: a power input interface, a microcontroller, and a current and voltage detection device; the power input interface is connected to the second power line, the current and voltage detection device is electrically connected to the power input interface, and the microcontroller is electrically connected to the current and voltage detection device; the current and voltage detection device is configured to detect the voltage and current input to the drive board and transmit the detected data to the microcontroller; The microcontroller is configured to: When the air conditioning unit is in a standby state, receiving a first voltage input to the outdoor unit detected by the current and voltage detection device; When the outdoor unit is in a standby state and the indoor unit is in a high-current mode, receiving a second voltage detected by the current and voltage detection device, calculating a difference between the first voltage and the second voltage as a first voltage drop, and comparing the first voltage drop with a preset maximum voltage drop of the first power line, and controlling the air-conditioning unit to alarm when the first voltage drop is greater than the maximum voltage drop of the first power line; wherein the current generated by the indoor unit in the high-current mode is a set current, and the set current is less than the maximum current allowed to be generated by the air-conditioning unit; When the indoor unit is in standby mode and the outdoor unit is in high current mode, the third voltage detected by the current and voltage detection device is received, the difference between the second voltage and the third voltage is calculated as a second voltage drop, and the second voltage drop is compared with a preset maximum voltage drop of the second power line. When the second voltage drop is greater than the maximum voltage drop of the second power line, the air-conditioning unit is controlled to alarm; wherein, the current generated by the outdoor unit in the high current mode is the set current.

2. The air conditioning unit according to claim 1, characterized in that: The maximum voltage drop of the first power line is: the voltage drop generated on the first power line when the length of the first power line is a first length, the wire diameter of the first power line is the minimum wire diameter allowed for the air-conditioning unit, and the current flowing through the first power line is a set current; wherein the first length is the length corresponding to the maximum distance between the power source and the air-conditioning unit; The maximum voltage drop of the second power cord is: the voltage drop generated on the second power cord when the length of the second power cord is the second length, the wire diameter of the second power cord is the minimum wire diameter allowed for the air-conditioning unit, and the current flowing through the second power cord is the set current; wherein the second length is the length corresponding to the maximum distance between the indoor unit and the outdoor unit.

3. The air conditioning unit according to claim 2, characterized in that: The driving board further includes a memory; the memory is electrically connected to the microcontroller, and the memory is used to store the first voltage drop and the second voltage drop.

4. The air conditioning unit according to claim 3, characterized in that: The indoor unit includes an indoor fan, and the indoor fan includes a motor. When the indoor unit is in a high current mode, the motor of the indoor fan does not operate.

5. The air conditioning unit according to claim 4, characterized in that: The fan includes a motor, which includes a main winding, a secondary winding, a starting capacitor, and a switch; the capacitor is connected in parallel with the switch; a first end of the main winding is electrically connected to a first end of the capacitor, a second end of the main winding is electrically connected to a first end of the secondary winding, and a second end of the secondary winding is electrically connected to a second end of the capacitor; the first end of the main winding is also electrically connected to a power supply terminal, and the second end of the main winding is also electrically connected to a current output terminal; When the switch is closed, the motor generates the set current.

6. The air conditioning unit according to claim 4, characterized in that: The current and voltage detection device includes a power factor correction module and a switching converter; the power factor correction module is electrically connected to the power input interface, the first end of the switching converter is electrically connected to the power factor correction module, and the second end of the switching converter is electrically connected to the microcontroller.

7. The air conditioning unit according to claim 5 or 6, characterized in that: The outdoor unit includes a compressor. When the outdoor unit is in a high current mode, the compressor operates at a high load.

8. The air conditioning unit according to claim 7, characterized in that: The outdoor unit further includes an outdoor fan, and the drive board further includes a fan intelligent power module and a compressor intelligent power module, wherein the fan intelligent power module is electrically connected to the microcontroller and the outdoor fan, respectively, and the compressor intelligent power module is electrically connected to the microcontroller and the compressor, respectively; The microcontroller controls the fan intelligent power module and the compressor intelligent power module through pulse width modulation, and the compressor intelligent power module adjusts the operating frequency of the compressor.

9. The air conditioning unit according to claim 8, characterized in that: The switching converter is electrically connected to the fan intelligent power module and the compressor intelligent power module respectively; the switching converter is configured to convert the voltage of the received power supply into a first voltage suitable for the fan intelligent power module and the compressor intelligent power module, and provide the first voltage to the fan intelligent power module and the compressor intelligent power module.

10. The air conditioning unit according to claim 9, characterized in that: The driving board further includes an external air sensor, the external air sensor being electrically connected to the microcontroller, the external air sensor being configured to detect the outdoor ambient temperature in real time and transmit temperature data to the microcontroller; The microcontroller is configured to control the outdoor fan to not operate when the outdoor ambient temperature is greater than or equal to a set temperature, and to control the outdoor fan to operate when the outdoor ambient temperature is less than the set temperature.

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