Current control type air conditioning system and control method

Abstract

The invention provides a current control type air conditioning system and a control method, and the system comprises a power supply module which is used for providing an AC power supply; the input end of the rectifying unit is electrically connected with the output end of the power supply module, and the rectifying unit is used for converting an alternating-current power supply into a direct-current power supply; the current detection module is connected in series in an output loop of the rectification unit and is used for detecting a loop current value in real time and outputting a current detection signal; the signal input end of the central control module is electrically connected with the signal output end of the current detection module, and the central control module is used for receiving the current detection signal and generating a corresponding current adjusting instruction; the control end of the power adjusting unit is electrically connected with the signal output end of the central control module, the input end of the power adjusting unit is electrically connected with the output end of the rectifying unit, and the power adjusting unit is used for adjusting output power according to the current adjusting instruction. The running current of the compressor is matched with the load requirement in real time, and the lag problem that a traditional air conditioner depends on temperature feedback is solved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of air conditioners, and in particular to a current-controlled air conditioner system and a control method thereof. Background Art

[0002] As people's living standards improve, air conditioners have become an indispensable appliance in daily life. Traditional air conditioning systems often use temperature as their primary control parameter, adjusting the compressor's operating state by detecting the difference between the indoor temperature and the set temperature. However, this control method suffers from slow response speed and low control accuracy, making it difficult to quickly respond to current fluctuations that occur during air conditioning system operation.

[0003] During air conditioning operation, the stability of current directly impacts system safety and energy efficiency. Excessive current can damage key components like the compressor and power module, shortening the air conditioner's lifespan. Unstable current, on the other hand, increases energy consumption and reduces operating efficiency. Furthermore, traditional air conditioning systems often lack control over their cooling control, making it impossible to adjust cooling intensity in response to current fluctuations, further impacting system stability and reliability. Summary of the Invention

[0004] The present invention mainly provides a current-controlled air-conditioning system and a control method thereof to solve the technical problems raised in the above-mentioned background technology.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A current-controlled air conditioning system comprises:

[0007] A power supply module, used to provide AC power;

[0008] a rectifier unit, whose input end is electrically connected to the output end of the power supply module and is used to convert AC power into DC power;

[0009] A current detection module is connected in series to the output circuit of the rectifier unit, and is used to detect the circuit current value in real time and output a current detection signal;

[0010] a central control module, whose signal input terminal is electrically connected to the signal output terminal of the current detection module, and is used to receive the current detection signal and generate a corresponding current regulation instruction;

[0011] a power regulating unit, whose control end is electrically connected to the signal output end of the central control module, and whose input end is electrically connected to the output end of the rectifier unit, for adjusting the output power according to the current regulation instruction;

[0012] A compressor driving module, whose input end is electrically connected to the output end of the power regulating unit, and whose output end is electrically connected to the air-conditioning compressor, for driving the compressor to operate;

[0013] The heat dissipation module has a power supply end electrically connected to the output end of the rectifier unit and a control end electrically connected to the signal output end of the central control module, and is used to perform heat dissipation operations according to instructions of the central control module.

[0014] Furthermore, the current detection module includes a Hall current sensor and a signal amplification circuit, the Hall current sensor is connected in series to the output circuit of the rectifier unit, the output end of the Hall current sensor is electrically connected to the input end of the signal amplification circuit, and the output end of the signal amplification circuit is electrically connected to the signal input end of the central control module.

[0015] Furthermore, the power regulation unit includes an IGBT power module and a drive circuit, the input end of the drive circuit is electrically connected to the signal output end of the central control module, the output end of the drive circuit is electrically connected to the gate of the IGBT power module, the collector of the IGBT power module is electrically connected to the output end of the rectifier unit, and the emitter of the IGBT power module is electrically connected to the input end of the compressor drive module.

[0016] Furthermore, it also includes a voltage sampling module, the input end of the voltage sampling module is connected in parallel to the output end of the rectifier unit, and the output end of the voltage sampling module is electrically connected to the signal input end of the central control module, for detecting the DC bus voltage and feeding it back to the central control module.

[0017] Furthermore, the central control module generates a current regulation instruction through a PID algorithm according to the current detection signal and the voltage sampling signal, and the power regulation unit adjusts the on-duty cycle of the IGBT power module according to the instruction.

[0018] Furthermore, the heat dissipation module includes a heat dissipation fan and a fan driving circuit, the input end of the fan driving circuit is electrically connected to the signal output end of the central control module, the output end of the fan driving circuit is electrically connected to the power supply end of the heat dissipation fan, and the air outlet of the heat dissipation fan corresponds to the heat sink setting of the IGBT power module.

[0019] Furthermore, the compressor drive module includes a three-phase bridge inverter circuit, the input end of the three-phase bridge inverter circuit is electrically connected to the output end of the power regulation unit, and the output end of the three-phase bridge inverter circuit is electrically connected to the three-phase winding of the compressor in a one-to-one correspondence.

[0020] Furthermore, an optoelectronic isolation module is provided between the central control module and the power regulating unit, the input end of the optoelectronic isolation module is electrically connected to the signal output end of the central control module, and the output end of the optoelectronic isolation module is electrically connected to the control end of the power regulating unit.

[0021] According to the above technical solution of a current-controlled air conditioning system, a current-controlled air conditioning control method is also provided, comprising the following steps:

[0022] S1. The power supply module outputs AC power, which is converted into DC power by the rectifier unit and then supplies power to the system;

[0023] S2. The current detection module detects the current value of the rectifier unit output circuit in real time, generates a current detection signal and transmits it to the central control module;

[0024] S3. The central control module receives the current detection signal, and when it detects that the current value exceeds the preset safety threshold, it generates a first current adjustment instruction and sends it to the power adjustment unit;

[0025] S4. The power regulation unit reduces the output power according to the first current regulation instruction, and reduces the operating current of the compressor through the compressor driving module until the current value detected by the current detection module falls back to a preset safety threshold range.

[0026] Furthermore, the rectifier unit converts the AC power output by the power supply module into DC power, the voltage sampling module detects the DC bus voltage and generates a voltage sampling signal, and the current detection module detects the loop current and generates a current detection signal, and both are transmitted synchronously to the central control module.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] First, the system of the present invention takes the current detection module as the core, and combines the voltage sampling module to realize the synchronous acquisition of current and voltage signals. The central control module generates adjustment instructions through the PID algorithm, and the IGBT power module of the power regulation unit responds quickly, so that the compressor operating current is matched with the load demand in real time, solving the lag problem of traditional air conditioners relying on temperature feedback, greatly improving the control accuracy and response speed, and ensuring that the air conditioner can operate efficiently under different working conditions.

[0029] Secondly, the present invention monitors the loop current in real time through the current detection module. When an overcurrent occurs, the central control module can quickly issue instructions to reduce the output power through the power regulation unit to achieve overcurrent protection; the optoelectronic isolation module effectively blocks high-voltage interference and protects core components such as the central control module; the heat dissipation module is linked to the heat dissipation requirements of the IGBT power module to avoid performance affected by overheating. The multiple protection mechanisms significantly improve the safe operation factor of the system and extend the service life of key components such as the compressor and IGBT power module.

[0030] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 This is a schematic structural diagram of the compressor drive module of the present invention;

[0033] Figure 3 Schematic diagram of the structure of the current detection module of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the heat dissipation module of the present invention.

[0035] In the figure: 1. Power supply module; 2. Rectifier unit; 3. Current detection module; 31. Hall current sensor; 32. Signal amplification circuit; 4. Central control module; 5. Power regulation unit; 51. IGBT power module; 511. Heat sink; 52. Drive circuit; 6. Compressor drive module; 61. Three-phase bridge inverter circuit; 7. Air-conditioning compressor; 71. Three-phase winding; 8. Heat dissipation module; 81. Cooling fan; 82. Fan drive circuit; 9. Voltage sampling module; 10. Optoelectronic isolation module. DETAILED DESCRIPTION

[0036] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0037] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which the present invention pertains. The terminology used herein in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0039] The embodiment of the present application provides a current-controlled air-conditioning system. The schematic diagram of the current-controlled air-conditioning system is as follows: Figure 1-4 As shown. The current-controlled air conditioning system includes:

[0040] Power supply module 1, used to provide AC power;

[0041] The rectifier unit 2 has an input terminal electrically connected to the output terminal of the power supply module 1 and is used to convert AC power into DC power;

[0042] The current detection module 3 is connected in series to the output circuit of the rectifier unit 2 and is used to detect the circuit current value in real time and output a current detection signal;

[0043] The central control module 4 has a signal input terminal electrically connected to the signal output terminal of the current detection module 3, and is used to receive the current detection signal and generate a corresponding current regulation instruction;

[0044] The power regulating unit 5 has a control end electrically connected to the signal output end of the central control module 4 and an input end electrically connected to the output end of the rectifier unit 2, and is used to adjust the output power according to the current regulation instruction;

[0045] A compressor driving module 6, whose input end is electrically connected to the output end of the power regulating unit 5, and whose output end is electrically connected to the air-conditioning compressor 7, is used to drive the compressor 7 to operate;

[0046] The heat dissipation module 8 has a power supply end electrically connected to the output end of the rectifier unit 2 and a control end electrically connected to the signal output end of the central control module 4 , and is used to perform heat dissipation operations according to instructions from the central control module 4 .

[0047] It should be noted that, in this embodiment, by constructing a control system with the current detection module 3 as the core, the power supply module 1, the rectifier unit 2, the current detection module 3, the central control module 4, the power regulation unit 5 and other modules are connected in order, thereby realizing real-time monitoring and regulation of the air-conditioning system current, solving the slow response problem caused by the traditional air-conditioning relying on temperature feedback, improving the system's ability to respond quickly to current fluctuations, ensuring the safe operation of key components such as the compressor 7, and extending the overall service life of the system.

[0048] Optional, please refer to the attached Figure 1The current detection module 3 includes a Hall current sensor 31 and a signal amplifying circuit 32. The Hall current sensor 31 is connected in series to the output circuit of the rectifier unit 2. The output end of the Hall current sensor 31 is electrically connected to the input end of the signal amplifying circuit 32. The output end of the signal amplifying circuit 32 is electrically connected to the signal input end of the central control module 4.

[0049] In this embodiment, the current detection module 3 adopts a combination of a Hall current sensor 31 and a signal amplification circuit 32. The Hall current sensor 31 has the characteristics of non-contact detection, avoiding interference with the main circuit. The signal amplification circuit 32 can amplify the weak original current signal, thereby improving the accuracy and sensitivity of current detection, making the current signal received by the central control module 4 more accurate, and providing a reliable basis for subsequent current regulation.

[0050] Optional, please refer to the attached Figure 1 The power regulation unit 5 includes an IGBT power module 51 and a drive circuit 52. The input end of the drive circuit 52 is electrically connected to the signal output end of the central control module 4, the output end of the drive circuit 52 is electrically connected to the gate of the IGBT power module 51, the collector of the IGBT power module 51 is electrically connected to the output end of the rectifier unit 2, and the emitter of the IGBT power module 51 is electrically connected to the input end of the compressor drive module 6.

[0051] In this embodiment, the power regulation unit 5 controls the IGBT power module 51 through the drive circuit 52. The IGBT power module 51 has the characteristics of fast switching speed and high efficiency. Combined with the precise control of the drive circuit 52, it can quickly respond to the current regulation instructions of the central control module 4, realize flexible adjustment of the output power, ensure the stability of the operating current of the compressor 7, solve the problem of delayed response of the traditional power regulation method, and improve the energy efficiency of the system.

[0052] Optional, please refer to the attached Figure 1 , and also includes a voltage sampling module 9, the input end of the voltage sampling module 9 is connected in parallel to the output end of the rectifier unit 2, and the output end of the voltage sampling module 9 is electrically connected to the signal input end of the central control module 4, for detecting the DC bus voltage and feeding it back to the central control module 4.

[0053] In this embodiment, a voltage sampling module 9 is added to detect the DC bus voltage and feed it back to the central control module 4, so that the central control module 4 can simultaneously obtain the current signal of the current detection module 3 and the voltage information of the voltage sampling module 9, thereby realizing comprehensive monitoring of the system operation status, avoiding the deviation that may occur when adjusting based only on the current signal, and improving the scientificity and accuracy of the control decision.

[0054] Optional, please refer to the attached Figure 1The central control module 4 generates a current regulation instruction through a PID algorithm according to the current detection signal and the voltage sampling signal, and the power regulation unit 5 adjusts the conduction duty cycle of the IGBT power module 51 according to the instruction.

[0055] In this embodiment, the central control module 4 uses a PID algorithm to process the current detection signal and the voltage sampling signal. The PID algorithm has the characteristics of high adjustment accuracy and good stability. It can adjust the conduction duty cycle of the IGBT power module 51 in real time according to the signal deviation, making the power regulation more precise, ensuring that the system output power is highly matched with the load demand, reducing energy waste, and improving the economy of the air-conditioning operation.

[0056] Optional, please refer to the attached Figure 1 and 4 The heat dissipation module 8 includes a heat dissipation fan 81 and a fan driving circuit 82. The input end of the fan driving circuit 82 is electrically connected to the signal output end of the central control module 4, and the output end of the fan driving circuit 82 is electrically connected to the power supply end of the heat dissipation fan 81. The air outlet of the heat dissipation fan 81 is set corresponding to the heat sink 511 of the IGBT power module 51.

[0057] In this embodiment, the heat dissipation module 8 receives instructions from the central control module 4 through the fan drive circuit 82, so that the speed of the heat dissipation fan 81 is linked to the heat dissipation demand of the IGBT power module 51. When the IGBT power module 51 generates increased heat due to current changes, the heat dissipation fan 81 can increase the speed in time to enhance the heat dissipation effect, thereby avoiding insufficient heat dissipation affecting the performance of the IGBT power module 51. At the same time, the speed is reduced at low load to reduce heat dissipation energy consumption.

[0058] Optional, please refer to the attached Figure 1 and 2 The compressor drive module 6 includes a three-phase bridge inverter circuit 61, the input end of the three-phase bridge inverter circuit 61 is electrically connected to the output end of the power regulation unit 5, and the output end of the three-phase bridge inverter circuit 61 is electrically connected to the three-phase winding 71 of the compressor 7 in a one-to-one correspondence.

[0059] In this embodiment, the compressor drive module 6 adopts a three-phase bridge inverter circuit 61, which can efficiently convert direct current into three-phase alternating current, and is connected one-to-one with the three-phase winding 71 of the compressor 7, ensuring that the compressor 7 obtains a balanced driving current, making the compressor 7 run more smoothly, reducing mechanical wear caused by current imbalance, and extending the service life of the compressor 7.

[0060] Optional, please refer to the attached Figure 1An optoelectronic isolation module 10 is provided between the central control module 4 and the power regulation unit 5. The input end of the optoelectronic isolation module 10 is electrically connected to the signal output end of the central control module 4, and the output end of the optoelectronic isolation module 10 is electrically connected to the control end of the power regulation unit 5.

[0061] In this embodiment, an optoelectronic isolation module 10 is set between the central control module 4 and the power regulation unit 5, and electrical isolation is achieved by optical signal transmission, which effectively blocks the interference and impact of the high-voltage signal in the power regulation unit 5 on the central control module 4, protects the core control component of the central control module 4, and improves the safety and anti-interference ability of the system operation.

[0062] Based on the same inventive concept, this embodiment further provides a current-controlled air conditioning control method, comprising the following steps:

[0063] S1. The power supply module 1 outputs AC power, which is converted into DC power by the rectifier unit 2 and then supplied to the system;

[0064] S2. The current detection module 3 detects the current value of the output circuit of the rectifier unit 2 in real time, generates a current detection signal and transmits it to the central control module 4;

[0065] S3. The central control module 4 receives the current detection signal, and when it detects that the current value exceeds the preset safety threshold, it generates a first current adjustment instruction and sends it to the power adjustment unit 5;

[0066] S4. The power regulating unit 5 reduces the output power according to the first current regulating instruction, and reduces the operating current of the compressor 7 through the compressor driving module 6 until the current value detected by the current detection module 3 falls back to the preset safety threshold range.

[0067] In this embodiment, when the current exceeds the preset safety threshold, the control method quickly issues an adjustment instruction through the central control module 4, so that the power adjustment unit 5 reduces the output power in time, thereby realizing overcurrent protection for the system, avoiding the overcurrent state from continuously damaging the compressor 7 and other components, and improving the safety and reliability of the air-conditioning system.

[0068] Furthermore, the rectifier unit 2 converts the AC power output by the power supply module 1 into a DC power supply, the voltage sampling module 9 detects the DC bus voltage and generates a voltage sampling signal, and the current detection module 3 detects the loop current and generates a current detection signal, and both are synchronously transmitted to the central control module 4.

[0069] In this embodiment, the current signal of the current detection module 3 and the voltage signal of the voltage sampling module 9 are synchronously collected and an adjustment instruction is generated through the PID algorithm, so that the power adjustment of the power adjustment unit 5 is matched with the load change in real time, and the speed of the cooling fan 81 is adjusted in conjunction with it, thereby realizing the coordination of power control and heat dissipation control of the heat dissipation module 8, ensuring the efficient operation of the compressor 7, and ensuring the heat dissipation requirements of the IGBT power module 51, thereby improving the overall stability and energy efficiency of the system.

[0070] The above description of the present invention is exemplified in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A current-controlled air conditioning system, characterized in that: include: A power supply module (1), configured to provide AC power; A rectifier unit (2), the input end of which is electrically connected to the output end of the power supply module (1), and is used to convert AC power into DC power; A current detection module (3) is connected in series to the output circuit of the rectifier unit (2) and is used to detect the circuit current value in real time and output a current detection signal; a central control module (4), whose signal input end is electrically connected to the signal output end of the current detection module (3), and is used to receive the current detection signal and generate a corresponding current adjustment instruction; A power regulating unit (5), whose control end is electrically connected to the signal output end of the central control module (4), and whose input end is electrically connected to the output end of the rectifier unit (2), is used to adjust the output power according to the current regulation instruction; A compressor driving module (6), the input end of which is electrically connected to the output end of the power regulating unit (5), and the output end of which is electrically connected to the air-conditioning compressor (7), for driving the air-conditioning compressor (7) to operate; A heat dissipation module (8) has a power supply end electrically connected to the output end of the rectifier unit (2), and a control end electrically connected to the signal output end of the central control module (4), and is used to perform heat dissipation operations according to instructions from the central control module (4).

2. The current-controlled air conditioning system according to claim 1, characterized in that: The current detection module (3) comprises a Hall current sensor (31) and a signal amplification circuit (32); the Hall current sensor (31) is connected in series to the output circuit of the rectifier unit (2); the output end of the Hall current sensor (31) is electrically connected to the input end of the signal amplification circuit (32); and the output end of the signal amplification circuit (32) is electrically connected to the signal input end of the central control module (4).

3. The current-controlled air conditioning system according to claim 1, characterized in that: The power regulating unit (5) comprises an IGBT power module (51) and a drive circuit (52), wherein the input end of the drive circuit (52) is electrically connected to the signal output end of the central control module (4), the output end of the drive circuit (52) is electrically connected to the gate of the IGBT power module (51), the collector of the IGBT power module (51) is electrically connected to the output end of the rectifier unit (2), and the emitter of the IGBT power module (51) is electrically connected to the input end of the compressor drive module (6).

4. The current-controlled air conditioning system according to claim 1, characterized in that: It also includes a voltage sampling module (9), the input end of the voltage sampling module (9) is connected in parallel to the output end of the rectifier unit (2), and the output end of the voltage sampling module (9) is electrically connected to the signal input end of the central control module (4), and is used to detect the DC bus voltage and feed it back to the central control module (4).

5. The current-controlled air conditioning system according to claim 1, characterized in that: The central control module (4) generates a current regulation instruction through a PID algorithm according to the current detection signal and the voltage sampling signal, and the power regulation unit (5) adjusts the conduction duty cycle of the IGBT power module (51) according to the instruction.

6. The current-controlled air conditioning system according to claim 1, characterized in that: The heat dissipation module (8) comprises a heat dissipation fan (81) and a fan driving circuit (82), wherein the input end of the fan driving circuit (82) is electrically connected to the signal output end of the central control module (4), the output end of the fan driving circuit (82) is electrically connected to the power supply end of the heat dissipation fan (81), and the air outlet of the heat dissipation fan (81) is arranged corresponding to the heat sink (511) of the IGBT power module (51).

7. The current-controlled air conditioning system according to claim 1, characterized in that: The compressor drive module (6) comprises a three-phase bridge inverter circuit (61), the input end of the three-phase bridge inverter circuit (61) being electrically connected to the output end of the power adjustment unit (5), and the output end of the three-phase bridge inverter circuit (61) being electrically connected in a one-to-one correspondence with the three-phase winding (71) of the compressor (7).

8. The current-controlled air conditioning system according to claim 1, characterized in that: A photoelectric isolation module (10) is provided between the central control module (4) and the power adjustment unit (5); the input end of the photoelectric isolation module (10) is electrically connected to the signal output end of the central control module (4); and the output end of the photoelectric isolation module (10) is electrically connected to the control end of the power adjustment unit (5).

9. A current-controlled air conditioning control method, used to implement the current-controlled air conditioning system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The power supply module (1) outputs AC power, which is converted into DC power by the rectifier unit (2) and then supplied to the system; S2. The current detection module (3) detects the current value of the output circuit of the rectifier unit (2) in real time, generates a current detection signal and transmits it to the central control module (4); S3. The central control module (4) receives the current detection signal, and when it detects that the current value exceeds the preset safety threshold, generates a first current adjustment instruction and sends it to the power adjustment unit (5); S4. The power regulating unit (5) reduces the output power according to the first current regulating instruction, and reduces the operating current of the compressor (7) through the compressor driving module (6) until the current value detected by the current detecting module (3) falls back to within the preset safety threshold range.

10. The current-controlled air conditioning system according to claim 1, characterized in that: The rectifier unit (2) converts the AC power output by the power supply module (1) into a DC power supply, the voltage sampling module (9) detects the DC bus voltage and generates a voltage sampling signal, and the current detection module (3) detects the loop current and generates a current detection signal, and both are synchronously transmitted to the central control module (4).

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