Self-adaptive load control circuit and multi-split air conditioning system

Abstract

The utility model discloses a self-adaptive load control circuit and a multi-split air conditioning system, and the self-adaptive load control circuit comprises a master control MCU which is used for outputting a PWM signal; the boosting unit is connected with the main control MCU, and the boosting unit is used for controlling the magnitude of the output voltage of the boosting unit according to the frequency of the PWM signal; the control unit is respectively connected with the main control MCU, the boosting unit and a load, and the control unit is used for outputting the output voltage of the boosting unit to the load; and the sampling unit is respectively connected with the main control MCU and the control unit, and the main control MCU is used for adjusting the frequency of the PWM signal according to the sampling voltage of the sampling unit. The master control MCU provided by the utility model can adjust the frequency of the PWM signal according to the actual output voltage of the load, and further controls the self-adaptive load control circuit to output the output voltage meeting the requirements to the load, so as to meet the actual use requirements of customers.

Description

Technical Field

[0001] The utility model relates to the field of control technology, in particular to an adaptive load control circuit and a multi-connected air-conditioning system. Background Art

[0002] In a multi-split air conditioning system, the indoor unit mainboard outputs DC power through AC-DC switching power supply conversion. The mainboard conventionally outputs DC 12V and 18VHBS communication power supply through the isolation transformer winding to meet the power supply requirements of 18V / 300mA for wired controllers and a communication distance of 250m.

[0003] However, in actual use, some users may only use a communication line of tens of meters to meet the requirements, so a power supply voltage of 12V can meet the requirements; other users may use longer or longer communication lines or use higher power or larger wired controllers, which require 18V or higher voltage.

[0004] Therefore, how to provide an adaptive load control circuit that can identify the size of the load, control the circuit voltage output, and meet the actual usage requirements of customers. Utility Model Content

[0005] The utility model provides a drive control circuit and an intelligent device, which are used to solve the problem in the prior art that the circuit cannot identify the size of the load, control the circuit voltage output, and meet the actual use requirements of customers.

[0006] The technical solution of the utility model is an adaptive load control circuit, comprising:

[0007] Main control MCU, used to output PWM signal;

[0008] A boost unit connected to the main control MCU, the boost unit is used to control the magnitude of its output voltage according to the frequency of the PWM signal;

[0009] a control unit, connected to the main control MCU, the boost unit and the load, respectively, and configured to output the output voltage of the boost unit to the load;

[0010] A sampling unit is connected to the main control MCU and the control unit respectively; the main control MCU is used to adjust the frequency of the PWM signal according to the sampling voltage of the sampling unit.

[0011] Furthermore, the control unit includes a transistor Q1, a transistor Q2, a transistor Q4, a resistor R1 and a resistor R2;

[0012] The emitter of the transistor Q1 is used to connect to the VDD pin, the collector of the transistor Q1 is connected to the positive electrode of the load, the base of the transistor Q1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to the power pin MCU_CONTROL of the main control MCU, the emitter of the transistor Q2 is respectively connected to the first input end of the sampling unit, the first end of the resistor R2 and the base of the transistor Q4; the collector of the transistor Q4 is connected to the negative electrode of the load, and the emitter of the transistor Q4, the second end of the resistor R2 and the second input end of the sampling unit are respectively connected to the sampling pin MCU_ADC of the main control MCU.

[0013] Furthermore, the transistor Q1 is an N-type transistor, and the transistor Q2 and the transistor Q4 are both P-type transistors.

[0014] Furthermore, the sampling unit includes a transistor Q3 and a resistor R3;

[0015] The collector of the transistor Q3 is connected to the collector of the transistor Q4, and the base of the transistor Q3 and the first end of the resistor R3 are respectively connected to the sampling pin MCU_ADC of the main control MCU;

[0016] The emitter of the transistor Q3 and the second end of the resistor R3 are both grounded.

[0017] Furthermore, the boost unit includes an inductor L1 and a MOS tube V1;

[0018] The first end of the inductor L1 is used to connect to the power supply pin of the main power supply, and the second end of the inductor L1 and the drain of the MOS tube V1 are both used to connect to the VDD pin;

[0019] The gate of the MOS transistor V1 is connected to the PWM pin MCU_PWM of the main control MCU, and the source of the MOS transistor V1 is grounded.

[0020] Furthermore, the voltage of the power supply pin of the main power supply is 12V.

[0021] Furthermore, the adaptive load control circuit further includes a rectifier unit, and the rectifier unit includes a rectifier diode D1;

[0022] The anode of the rectifier diode D1 is connected to the output end of the boost unit, and the cathode of the rectifier diode D1 is used to connect to the VDD pin.

[0023] Furthermore, the adaptive load control circuit further includes a first filtering unit, and the first filtering unit includes a capacitor C1;

[0024] A first end of the capacitor C1 is connected to the VDD pin, and a second end of the capacitor C1 is grounded.

[0025] Furthermore, the adaptive load control circuit further includes a second filtering unit, and the second filtering unit includes a common-mode inductor L2;

[0026] The first input end of the common-mode inductor L2 is connected to the output end of the control unit, the first output end of the common-mode inductor L2 is connected to the positive electrode of the load, the second input end of the common-mode inductor L2 is connected to the negative electrode of the load, and the second output end of the common-mode inductor L2 is connected to the second input end of the control unit.

[0027] The present invention also provides a multi-connected air-conditioning system, which includes the adaptive load control circuit described above.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] The main control MCU proposed in the utility model can adjust the frequency of the PWM signal according to the actual output voltage of the load, and then control the adaptive load control circuit to output the required output voltage to the load to meet the actual usage requirements of the customer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains; the terms used in the specification of the application are intended only to describe specific embodiments and are not intended to limit this invention; the terms "including" and "having," as well as any variations thereof, in the specification and claims of this invention and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the specification and claims of this invention and the accompanying drawings are used to distinguish between different objects, not to describe a specific order.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a module block diagram of the adaptive load control circuit proposed in this utility model;

[0033] Figure 2This is a circuit diagram of the adaptive load control circuit proposed in the present utility model;

[0034] Figure 3 This is a control flow chart of the multi-connected air conditioning system proposed in this utility model.

[0035] Reference numerals:

[0036] 10. Main control MCU;

[0037] 20. Booster unit;

[0038] 30. Control unit;

[0039] 40. Sampling unit;

[0040] 50. Load;

[0041] 60. Main power supply;

[0042] 70. Rectifier unit;

[0043] 80. A first filtering unit;

[0044] 90. Second filtering unit. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly stated. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0046] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0047] Example 1

[0048] In a multi-split air conditioning system, the indoor unit mainboard outputs DC power through AC-DC switching power supply conversion. The mainboard conventionally outputs DC 12V and 18VHBS communication power supply through the isolation transformer winding to meet the power supply requirements of 18V / 300mA for wired controllers and a communication distance of 250m.

[0049] However, in actual use, some users may only use a communication line of tens of meters to meet the requirements, so a power supply voltage of 12V can meet the requirements; other users may use longer or longer communication lines or use higher power or larger wired controllers, which require 18V or higher voltage.

[0050] Therefore, in order to solve the above problems, refer to the attached Figure 1 The present invention provides an adaptive load control circuit that can identify the size of the load output voltage and control the circuit voltage output to meet the actual usage requirements of customers. The adaptive load control circuit includes:

[0051] The main control MCU 10 is used to output PWM signals;

[0052] A boost unit 20 connected to the main control MCU 10; the boost unit 20 is used to control the magnitude of its output voltage according to the frequency of the PWM signal;

[0053] a control unit 30 connected to the main control MCU 10 , the boost unit 20 , and the load 50 ; the control unit 30 is configured to output the output voltage of the boost unit 20 to the load 50 ;

[0054] The sampling unit 40 is connected to the main control MCU 10 and the control unit 30 respectively; the main control MCU 10 is used to adjust the frequency of the PWM signal according to the sampling voltage of the sampling unit 40.

[0055] It should be noted that the main control MCU 10 is pre-configured with multiple adjustable PWM signal frequencies, namely f1, f2, ..., fn, with f1 < f2 < ... < fn. The PWM signal frequency output by the main control MCU 10 defaults to f1. Accordingly, the sampled voltage detected by the sampling unit 40 defaults to the preset voltage V1.

[0056] Therefore, when the adaptive load control circuit is powered on, the main control MCU 10 outputs a PWM signal of frequency f1 by default, and the boost unit 20 boosts and outputs an output voltage according to the PWM signal of frequency f1; at the same time, the control unit 30 is turned on accordingly to transmit the output voltage of the boost unit 20 to the load 50 for the load 50 to operate. At this time, the sampling unit 40 transmits the detected sampled voltage V to the main control MCU 10, and then the main control MCU 10 compares the sampled voltage V with the preset voltage V1. If the sampled voltage V is greater than the preset voltage V1, it is determined that the load 50 is The output voltage is too low, causing the load 50 to be overloaded. At this time, the frequency of the PWM signal needs to be increased by one level. Then the main control MCU 10 receives the sampled voltage V from the sampling unit 40 again and compares the sampled voltage V with the preset voltage V1. If the sampled voltage V is still greater than the preset voltage V1, the frequency of the PWM signal needs to be increased by one level until the sampled voltage V is no greater than the preset voltage V1. At this time, the main control MCU 10 will keep the current PWM signal frequency unchanged to continuously output an output voltage that meets the requirements of the load 50 to the corresponding load 50, so as to meet the actual usage requirements of the customer.

[0057] In order to ensure that the control unit 30 can smoothly transmit the output voltage of the boost unit 20 to the load 50 for the load 50 to operate, refer to the attached Figure 2 , this embodiment provides a circuit structure diagram of a control unit 30:

[0058] The control unit 30 includes a transistor Q1, a transistor Q2, a transistor Q4, a resistor R1 and a resistor R2;

[0059] The emitter of the transistor Q1 is used to connect to the VDD pin, the collector of the transistor Q1 is connected to the positive electrode of the load 50, the base of the transistor Q1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to the power pin MCU_CONTROL of the main control MCU10, the emitter of the transistor Q2 is respectively connected to the first input end of the sampling unit 40, the first end of the resistor R2 and the base of the transistor Q4; the collector of the transistor Q4 is connected to the negative electrode of the load 50, and the emitter of the transistor Q4, the second end of the resistor R2 and the second input end of the sampling unit 40 are respectively connected to the sampling pin MCU_ADC of the main control MCU10.

[0060] It should be noted that the resistor R1 plays a role in current limiting, and the resistor R2 plays a role in ensuring that the switch tube Q4 is turned on.

[0061] Therefore, when the adaptive load control circuit is powered on, the main control MCU10 outputs a PWM signal with a frequency of f1 by default, and at this time the power pin MCU_CONTROL of the main control MCU10 will output a high level, causing the transistor Q1 to be turned on, and then the transistor Q1 sends a low level signal to the transistor Q2 to turn on the transistor Q2, and at the same time the transistor Q1 sends a high level signal to the transistor Q4 to turn on the transistor Q4, thereby smoothly transmitting the output voltage of the boost unit 20 to the load 50, thereby ensuring the normal operation of the adaptive load control circuit.

[0062] To ensure that transistors Q1 and Q4 are both turned on by a high level and transistor Q2 is turned on by a low level, the transistor Q1 proposed in this embodiment is preferably an N-type transistor, and transistors Q2 and Q4 are preferably P-type transistors.

[0063] In order to ensure that the main control MCU 10 can smoothly receive the sampling voltage V of the sampling unit 40, refer to the attached Figure 2 , the sampling unit 40 includes a transistor Q3 and a resistor R3;

[0064] The collector of the transistor Q3 is connected to the collector of the transistor Q4, and the base of the transistor Q3 and the first end of the resistor R3 are respectively connected to the sampling pin MCU_ADC of the main control MCU10;

[0065] The emitter of the transistor Q3 and the second end of the resistor R3 are both grounded.

[0066] It should be noted that the transistor Q3 in this embodiment is preferably a P-type transistor, and the transistor Q3 plays a protective role to prevent the sampling unit 40 or the adaptive load control circuit from being damaged.

[0067] In order to ensure that the boost unit 20 can boost and output according to the frequency of the PWM signal, refer to the attached Figure 2 , this embodiment proposes a circuit structure diagram of a boost unit 20:

[0068] The boost unit 20 includes an inductor L1 and a MOS tube V1;

[0069] The first end of the inductor L1 is used to connect to the power supply pin of the main power supply 60, and the second end of the inductor L1 and the drain of the MOS transistor V1 are both used to connect to the VDD pin;

[0070] The gate of the MOS transistor V1 is connected to the PWM pin MCU_PWM of the main control MCU10, and the source of the MOS transistor V1 is grounded.

[0071] It should be noted that the higher the frequency of the PWM signal, the higher the output voltage of the boost unit 20, and correspondingly, the higher the output voltage of the load 50. The main power supply 60 proposed in this embodiment is preferably an HBS communication power supply.

[0072] The voltage of the power supply pin of the main power supply 60 is 12V.

[0073] It should be noted that the basic power supply voltage of the load 50 is 12V. When the adaptive load control circuit detects that the load 50 has a large power demand, that is, the sampling voltage V is greater than the preset voltage V1, the main control MCU10 will increase the frequency of the output PWM signal, and then the boost unit 20 will perform a corresponding boost based on the 12V according to the frequency of the PWM signal and output an output voltage to the load 50, thereby controlling the size of the output voltage of the load 50 to meet the actual usage requirements of the customer.

[0074] In order to prevent the back electromotive force (Back EMF) generated by the inductor L1 when the MOS tube V1 is turned off from damaging the adaptive load control circuit, refer to the attached Figure 2 , the adaptive load control circuit further includes a rectifier unit 70, and the rectifier unit 70 includes a rectifier diode D1;

[0075] The anode of the rectifier diode D1 is connected to the second end of the inductor L1 and the drain of the MOS transistor V1 respectively, and the cathode of the rectifier diode D1 is used to connect to the VDD pin.

[0076] In order to reduce the ripple in the pulsating DC power and make the output voltage of the boost unit 20 more stable, refer to the attached Figure 2 , the adaptive load control circuit further includes a first filtering unit 80, and the first filtering unit 80 includes a capacitor C1;

[0077] A first end of the capacitor C1 is connected to the VDD pin, and a second end of the capacitor C1 is grounded.

[0078] Among them, refer to the attached Figure 2 The adaptive load control circuit further includes a second filtering unit 90, which includes a common-mode inductor L2. A first input end of the common-mode inductor L2 is connected to the collector of the switch tube Q1, a first output end of the common-mode inductor L2 is connected to the positive electrode of the load 50, a second input end of the common-mode inductor L2 is connected to the negative electrode of the load 50, and a second output end of the common-mode inductor L2 is connected to the collector of the switch tube Q4.

[0079] In this way, the common-mode inductor L2 can further reduce the high-frequency noise in the output voltage of the boost unit 20, making the output voltage of the boost unit 20 smoother; and the common-mode inductor L2 can also prevent the common-mode noise from entering the load 50, ensuring the normal operation of the load 50; and the common-mode inductor L2 can also suppress the common-mode noise of the adaptive load control circuit, reduce the electromagnetic radiation of the adaptive load control circuit to the outside, improve the electromagnetic compatibility of the adaptive load control circuit, and ensure that the adaptive load control circuit can operate stably in a complex electromagnetic environment.

[0080] Example 2

[0081] The present invention also provides a multi-connected air-conditioning system, which includes the adaptive load control circuit described above.

[0082] The multi-connected air-conditioning system includes an indoor unit, a mainboard is provided in the indoor unit, and the self-adaptive load control circuit proposed by the present invention is provided in the mainboard.

[0083] In this way, the multi-split air conditioning system can adjust the frequency of the PWM signal output by the main control MCU10 according to the actual output voltage of the load 50, and then control the adaptive load control circuit to output the required output voltage to the load 50 to meet the actual usage requirements of the customer.

[0084] Refer to the attached Figure 2 , a circuit structure of the adaptive load control circuit is:

[0085] The adaptive load control circuit includes an inductor L1, a common-mode inductor L2, a MOS transistor V1, a transistor Q1, a transistor Q2, a transistor Q3, a transistor Q4, a resistor R1, a resistor R2, a resistor R3, a rectifier diode D1 and a capacitor C1;

[0086] The first end of the inductor L1 is connected to the power supply pin 12V of the main power supply 60. The second end of the inductor L1 and the drain of the MOS transistor V1 are respectively connected to the positive electrode of the rectifier diode D1. The cathode of the rectifier diode D1, the first end of the capacitor C1, and the emitter of the transistor Q1 are all connected to the VDD pin. The gate of the MOS transistor V1 is connected to the PWM pin MCU_PWM of the main control MCU 10.

[0087] The collector of transistor Q1 is connected to the first input end of common-mode inductor L2, the base of transistor Q1 is connected to the first end of resistor R1, the second end of resistor R1 is connected to the collector of transistor Q2, the base of transistor Q2 is connected to the power pin MCU_CONTROL of the main control MCU 10, and the emitter of transistor Q2 is respectively connected to the collector of transistor Q3, the first end of resistor R2, and the base of transistor Q4; the collector of transistor Q4 is connected to the second output end of common-mode inductor L2, the first output end of common-mode inductor L2 is connected to the positive electrode of load 50, and the second input end of common-mode inductor L2 is connected to the negative electrode of load 50;

[0088] The base of the transistor Q3, the emitter of the transistor Q4, the second end of the resistor R2 and the first end of the resistor R3 are respectively connected to the sampling pin MCU_ADC of the main control MCU10;

[0089] The source of the MOS transistor V1 , the emitter of the transistor Q3 , the second end of the capacitor C1 , and the second end of the resistor R3 are all grounded.

[0090] Refer to the attached Figure 3 , the control method of the adaptive load control circuit is:

[0091] When the multi-split air conditioning system is powered on, the main board is powered on accordingly, the adaptive load control circuit starts to operate, and the main control MCU 10 obtains the sampled voltage V through the sampling unit 40 and compares the sampled voltage V with the preset voltage V1;

[0092] If the sampled voltage V is not greater than the preset voltage V1, the adaptive load control circuit operates normally;

[0093] If the sampled voltage V is greater than the preset voltage V1, it is determined that the output voltage of the load 50 is too low, causing the load 50 to be overloaded. In this case, the frequency of the PWM signal needs to be increased by one level. Then, the main control MCU 10 obtains the sampled voltage V of the sampling unit 40 again and compares it with the preset voltage V1 again.

[0094] If the sampled voltage V is still greater than the preset voltage V1, the frequency of the PWM signal needs to be increased by one level until the sampled voltage V is no greater than the preset voltage V1. At this time, the main control MCU 10 will maintain the current PWM signal frequency unchanged to continuously output an output voltage that meets the requirements of the load 50 to the corresponding load 50, thereby meeting the actual usage requirements of the customer.

[0095] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of protection of the present invention patent.

Claims

1. Adaptive load control circuit, characterized in that, include: A main control MCU (10), configured to output a PWM signal; A boost unit (20) connected to the main control MCU (10), the boost unit (20) being used to control the magnitude of its output voltage according to the frequency of the PWM signal; a control unit (30) connected to the main control MCU (10), the boost unit (20) and the load (50), respectively, the control unit (30) being used to output the output voltage of the boost unit (20) to the load (50); A sampling unit (40) is connected to the main control MCU (10) and the control unit (30) respectively; the main control MCU (10) is used to adjust the frequency of the PWM signal according to the sampling voltage of the sampling unit (40).

2. The adaptive load control circuit according to claim 1, wherein: The control unit (30) includes a transistor Q1, a transistor Q2, a transistor Q4, a resistor R1, and a resistor R2; The emitter of the transistor Q1 is used to connect to the VDD pin, the collector of the transistor Q1 is connected to the positive electrode of the load (50), the base of the transistor Q1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to the power pin MCU_CONTROL of the main control MCU (10), the emitter of the transistor Q2 is respectively connected to the first input end of the sampling unit (40), the first end of the resistor R2 and the base of the transistor Q4; the collector of the transistor Q4 is connected to the negative electrode of the load (50), and the emitter of the transistor Q4, the second end of the resistor R2 and the second input end of the sampling unit (40) are respectively connected to the sampling pin MCU_ADC of the main control MCU (10).

3. The adaptive load control circuit according to claim 2, wherein: The transistor Q1 is an N-type transistor, and the transistor Q2 and the transistor Q4 are both P-type transistors.

4. The adaptive load control circuit according to claim 2, wherein: The sampling unit (40) includes a transistor Q3 and a resistor R3; The collector of the transistor Q3 is connected to the collector of the transistor Q4, and the base of the transistor Q3 and the first end of the resistor R3 are respectively connected to the sampling pin MCU_ADC of the main control MCU (10); The emitter of the transistor Q3 and the second end of the resistor R3 are both grounded.

5. The adaptive load control circuit according to claim 1, wherein: The boost unit (20) comprises an inductor L1 and a MOS tube V1; The first end of the inductor L1 is used to connect to the power supply pin of the main power supply (60), and the second end of the inductor L1 and the drain of the MOS tube V1 are both used to connect to the VDD pin; The gate of the MOS tube V1 is connected to the PWM pin MCU_PWM of the main control MCU (10), and the source of the MOS tube V1 is grounded.

6. The adaptive load control circuit according to claim 5, characterized in that: The voltage of the power supply pin of the main power supply (60) is 12V.

7. The adaptive load control circuit according to claim 1, wherein: The adaptive load control circuit further comprises a rectifier unit (70), wherein the rectifier unit (70) comprises a rectifier diode D1; The positive electrode of the rectifier diode D1 is connected to the output end of the boost unit (20), and the negative electrode of the rectifier diode D1 is used to connect to the VDD pin.

8. The adaptive load control circuit according to claim 1, wherein: The adaptive load control circuit further comprises a first filtering unit (80), wherein the first filtering unit (80) comprises a capacitor C1; A first end of the capacitor C1 is connected to the VDD pin, and a second end of the capacitor C1 is grounded.

9. The adaptive load control circuit according to claim 1, wherein: The adaptive load control circuit further comprises a second filtering unit (90), wherein the second filtering unit (90) comprises a common mode inductor L2; The first input end of the common-mode inductor L2 is connected to the output end of the control unit (30), the first output end of the common-mode inductor L2 is connected to the positive electrode of the load (50), the second input end of the common-mode inductor L2 is connected to the negative electrode of the load (50), and the second output end of the common-mode inductor L2 is connected to the second input end of the control unit (30).

10. A multi-split air conditioning system, characterized in that: The multi-split air conditioning system includes the adaptive load control circuit according to any one of claims 1 to 9.

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