Power supply control system of air conditioner and air conditioner

Abstract

The application discloses a power supply control system of an air conditioner and the air conditioner, relates to the technical field of air conditioners, and provides the following technical scheme: multiple input ends of a switching module are connected with multiple AC power supplies, output ends are connected with an air compressor frequency converter, a fan frequency converter and an energy storage module, the energy storage module is connected with the air compressor frequency converter, is used for storing energy when the switching module outputs AC power, and outputs electric energy to the air compressor frequency converter when the switching module stops outputting AC power, and a processor is connected with the switching module, the air compressor frequency converter and the fan frequency converter, and is used for controlling the fan frequency converter to output electric energy output by the fan to the air compressor frequency converter after conversion when controlling the switching module to switch AC power of the input end. In the switching process of the AC power, the air compressor is supplied with power by the energy storage module, the fan and the fan frequency converter, the continuous power supply of the air compressor is guaranteed, the air conditioner is prevented from stopping running in the switching process of the power supply, and the requirement that the air conditioner does not stop running within 24 hours is achieved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and in particular to a power supply control system for an air conditioner and an air conditioner. Background Technology

[0002] In some spaces, such as data centers, there are strict requirements for cooling, requiring air conditioners to operate continuously for 24 hours. Currently, to meet this requirement, air conditioners are typically supplied with two power supplies: AC power supply I and AC power supply II. Specifically, the two power supplies are connected to the air compressor and fan of the air conditioner through two contactors. At any given time, only one contactor is on, while the other is off, so that one power supply powers the air compressor and fan of the air conditioner.

[0003] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art: When one mains power supply fails or loses power, the contactor is used to switch the failed or lost mains power supply to another normal mains power supply. However, the contactor switching time is relatively long, which causes the air compressor and fan to stop first and then restart after the contactor switching is completed, making it difficult to meet the requirement of uninterrupted operation of the air conditioner. Summary of the Invention

[0004] The purpose of this invention is to provide a power supply control system and air conditioner that can supply power to the air compressor through the energy storage module, fan and fan frequency converter during AC power switching, so as to avoid the air conditioner stopping during power switching and achieve the requirement of air conditioner not stopping for 24 hours.

[0005] To solve the above-mentioned technical problems, the present invention provides a power supply control system for an air conditioner, comprising:

[0006] The switching module has multiple input terminals connected to multiple AC power sources, and its output terminals connected to the air compressor frequency converter, the fan frequency converter, and the energy storage module, respectively.

[0007] The energy storage module is connected to the air compressor frequency converter and is used to store energy when AC power is output at the output terminal of the switching module, and to output electrical energy to the air compressor frequency converter when AC power is stopped at the output terminal of the switching module.

[0008] The air compressor frequency converter is connected to the air compressor of the air conditioner;

[0009] The fan inverter is connected to the air conditioner fan;

[0010] The processor is connected to the switching module, the air compressor frequency converter, and the fan frequency converter respectively, and is used to control the fan frequency converter to convert the electrical energy output by the fan and output it to the air compressor frequency converter when controlling the switching module to switch the AC power at the input terminal.

[0011] Optionally, the energy storage module includes:

[0012] Three capacitors, the first terminals of the three capacitors are respectively connected to the output terminal of the switching module, and the second terminals of the three capacitors are all grounded;

[0013] Three reactors, the first end of each of the three reactors is connected to the first end of the three capacitors respectively, and the second end is connected to the input end of the air compressor frequency converter.

[0014] Optional, also includes:

[0015] A voltage transformer, the input terminal of which is connected to the output terminal of the switching module, and the output terminal of which is connected to the processor, is used to detect the voltage of the AC power output from the output terminal of the switching module;

[0016] A current transformer, the input terminal of which is connected to the output terminal of the switching module, and the output terminal of which is connected to the processor, is used to detect the current of the AC power output from the output terminal of the switching module;

[0017] Controlling the fan frequency converter to convert the electrical energy output by the fan and output it to the air compressor frequency converter includes:

[0018] Determine the phase angle of the AC voltage output by the switching module when the current of the AC output at the output terminal of the switching module drops to a preset current threshold.

[0019] The frequency converter controls the fan to convert the electrical energy output by the fan into alternating current and outputs the alternating current to the frequency converter of the air compressor, wherein the initial phase angle of the alternating current is consistent with the phase angle.

[0020] Optional, also includes:

[0021] A current transformer, the input terminal of which is connected to the output terminal of the switching module, and the output terminal of which is connected to the processor, is used to detect the current of the AC power output from the output terminal of the switching module;

[0022] Controlling the switching module to switch the AC power at its input terminal includes:

[0023] When the AC current at the output of the switching module drops to a preset current threshold, the switching module is controlled to switch the AC current at the input.

[0024] Optional, also includes:

[0025] The power module has multiple input terminals connected to multiple AC power sources and an output terminal connected to the processor. It is used to step down and rectify the AC power to obtain DC power.

[0026] Optional, also includes:

[0027] An interaction module, connected to the processor, is used to control the switching module to select one AC power supply to be connected.

[0028] Optionally, the processor is further configured to control the fan to a rated speed via the fan frequency converter when the fan motor is in an electric state.

[0029] Optionally, the switching module is an ATS.

[0030] Optionally, the processor is further configured to determine the fan speed and the air compressor speed of the fan and the air compressor when the AC power at the input of the switching module is successfully switched, control the output power of the fan inverter according to the fan speed so that the initial speed of the fan is the fan speed; and control the air compressor inverter according to the air compressor speed so that the initial speed of the air compressor is the air compressor speed.

[0031] To solve the above-mentioned technical problems, the present invention also provides an air conditioner, including a fan and an air compressor, and further including a power supply control system for the air conditioner as described above, wherein the power supply control system for the air conditioner is connected to the fan and the air compressor respectively.

[0032] This application provides a power supply control system for an air conditioner and the air conditioner itself. The power supply control system includes a switching module, an energy storage module, an air compressor inverter, a fan inverter, and a processor. The processor can control the switching module to switch to another AC power source when one AC power source fails or is interrupted. The energy storage module supplies power to the air compressor during the AC power switching process. Simultaneously, the processor controls the fan inverter to convert the electrical energy output by the fan motor (which is in a generator state due to inertia) into power to supply the air compressor. In this way, the energy storage module, fan, and fan inverter can supply power to the air compressor during AC power switching, ensuring continuous power supply to the air compressor and preventing the air conditioner from stopping during power switching, thus achieving the requirement of 24-hour uninterrupted operation. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the power supply control system for an air conditioner provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the power supply control system for a specific air conditioner provided by the present invention. Detailed Implementation

[0036] The core of this invention is to provide a power supply control system and an air conditioner that can supply power to the air compressor through an energy storage module, a fan, and a fan frequency converter during AC power switching, thereby preventing the air conditioner from stopping during power switching and achieving the requirement of uninterrupted operation of the air conditioner for 24 hours.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To address the problem of air conditioners stopping operation during power switching, and to ensure continuous operation even in the event of a power outage or failure of one mains power supply, the inventors of this invention first considered adding a back-mounted UPS (Uninterruptible Power Supply). When switching module 1 performs AC power switching, if there is a momentary (100-200ms) period of no current output, the current transformer detects zero current, and the processor 5 automatically sends a command to the UPS, causing the UPS to supply power to the air compressor, ensuring uninterrupted operation of the entire air conditioner. When switching module 1 completes the AC power switching, the current transformer detects current output from switching module 1, and the processor 5 sends a command to the UPS, causing the UPS to stop power output and enter a sleep or charging state.

[0039] This scheme allows the UPS to power the air compressor during the switching of the mains power supply in switching module 1, ensuring continuous operation of the entire air conditioning system. However, at the moment the switching is completed, the large current and voltage output of switching module 1 can easily cause overcurrent and overvoltage surges to the UPS, air compressor inverter, and fan inverter, potentially damaging them. Furthermore, because the phase angle of the mains power supply after the switch is not always aligned with the phase angle of the UPS output power supply, voltage surges can also occur, easily damaging the UPS, air compressor inverter, and fan inverter, increasing maintenance costs. Additionally, the UPS itself is expensive and occupies space, increasing the overall cost and size of the system, making it uneconomical.

[0040] To address the aforementioned technical problems, this invention provides a power supply control system for an air conditioner.

[0041] Specifically, please see Figure 1 As shown, Figure 1 This is a schematic diagram of the power supply control system for an air conditioner provided by the present invention. Figure 1 Taking the example of a multi-channel AC power supply in China and Israel, which includes two power supplies: Channel I (mains power supply) and Channel II (mains power supply).

[0042] The power supply control system of the air conditioner includes:

[0043] Switching module 1 has multiple input terminals connected to multiple AC power sources, and its output terminals connected to the air compressor frequency converter, the fan frequency converter, and the energy storage module, respectively.

[0044] Energy storage module 2 is connected to the air compressor frequency converter. It is used to store energy when AC power is output at the output terminal of the switching module and to output electrical energy to the air compressor frequency converter when AC power is stopped at the output terminal of the switching module.

[0045] Air compressor inverter 3 is connected to air compressor 6 of air conditioner;

[0046] The fan inverter 4 is connected to the air conditioner fan 7;

[0047] The processor 5 is connected to the switching module 2, the air compressor frequency converter 3 and the fan frequency converter 4 respectively. It is used to control the fan frequency converter 4 to convert the electrical energy output by the fan 7 and output it to the air compressor frequency converter 3 when the AC power input terminal of the switching module 2 is switched.

[0048] The power supply control system of this air conditioner includes a switching module 1, an energy storage module 2, an air compressor inverter 3, a fan inverter 4, and a processor 5. When power is initially supplied to the air compressor, the processor 5 controls the switching module 1 to select a mains power supply for the air compressor. Simultaneously, it charges the energy storage module 2, which stores energy. When the mains power supply experiences a power outage or failure, the processor 5 controls the switching module 1 to switch from the out-of-power mains power supply to the working mains power supply. At the same time, while the switching module 1 is switching the AC input, the energy storage module 2 supplies power to the air compressor. It should also be noted that during the switching process, no power supply is provided to the fan 7 in the switching module 1. Due to inertia, the fan 7 is in a generator state. This solution utilizes the electrical energy generated by the fan 7 in the generator state to control the fan inverter 4 to convert the electrical energy output by the fan 7 and output it to the air compressor inverter 3 to power the air compressor 6. This ensures that the air compressor 6 has power throughout the switching process of the switching module 1, thus achieving the requirement of uninterrupted air conditioning operation.

[0049] Among them, processor 5 can be a PLC (Programmable Logic Controller). PLCs have high reliability and strong anti-interference capabilities, which can effectively cope with various interferences in the industrial environment, thereby ensuring the stable operation of the system. In addition, PLCs are small in size, light in weight, low in power consumption, and easy to install. They do not require a dedicated machine room or strict shielding measures, making them very suitable for applications with limited space or low energy consumption requirements. PLCs also have large storage capacity and powerful I / O interfaces, which can be connected to distributed factory automation systems for supervision and monitoring, enabling efficient, reliable and flexible control.

[0050] In addition, an ATS (Automatic Transfer Switching Equipment) can be used as the switching module 1. Because the ATS has a fast switching speed, it can quickly cut off the power supply in the event of a fault, ensuring the safety and continuous power supply of the system. Specifically, if the fan inverter 4 is a four-quadrant inverter, the corresponding fan 7 is an AC fan; or, if the fan inverter 4 is a bidirectional inverter, the corresponding fan 7 is a DC fan.

[0051] Furthermore, to ensure that the air conditioner does not shut down within 24 hours during the switching of AC power at the input terminal of the control switching module 1, in practical applications, the total energy of the energy stored in the energy storage module 2 and the energy generated by the motor of the fan in power generation due to inertia must not be less than the electrical energy consumed by the air compressor during the switching process of the switching module 1.

[0052] As can be seen, the power supply control system for the air conditioner provided by this invention can control the switching module 1 to switch to another AC power source when one AC power source fails or is interrupted. During this process, the energy storage module 2 supplies power to the air compressor of the air conditioner. Simultaneously, the processor 5 controls the fan inverter 4 to convert the electrical energy output by the fan motor in its generator state due to inertia and output it to the air compressor inverter 3 to supply power to the air compressor. In this way, the energy storage module, fan, and fan inverter can supply power to the air compressor during the AC power switching process, ensuring continuous power supply to the air compressor and preventing the air conditioner from stopping during power switching, thus achieving the requirement of uninterrupted operation of the air conditioner for 24 hours.

[0053] Based on the above embodiments:

[0054] This invention uses two power supply sources, AC power supply I and AC power supply II, as examples. Please refer to... Figure 2 As shown, Figure 2This is a schematic diagram of a specific power supply control system for an air conditioner provided by the present invention. The power supply control system specifically comprises two power supplies: a mains power supply (Channel I) and a mains power supply (Channel II); a first circuit breaker QF1; a second circuit breaker QF2; a third circuit breaker QF3; a fourth circuit breaker QF4; a switching module 1; an air compressor inverter 3; a fan inverter 4; a processor 5; an air compressor 6; a fan 7; a first current transformer 8; a second current transformer 9; a voltage transformer 10; a first capacitor C1; a second capacitor C2; a third capacitor C3; and a first reactor. The system comprises L1, L2, L3, power module 11, and interaction module 12. The I-channel mains power supply and the II-channel mains power supply are connected to the switching module 1 via the first circuit breaker QF1 and the second circuit breaker QF2, respectively. The output of the switching module 1 is connected to the air compressor inverter 3, the fan inverter 4, the energy storage module 2, and the processor 5, respectively. The input of the voltage transformer 10 is connected to the output of the switching module 1, and its output is connected to the processor 5. The input terminal of current transformer 8 is connected to the output terminal of switching module 1, and the output terminal is connected to processor 5. The first terminals of the three capacitors are connected to the output terminals of switching module 1 one by one, and the second terminals are all grounded. The first terminals of the three reactors are connected to the first terminals of the three capacitors one by one, and the second terminals are connected to the input terminal of air compressor inverter 3. The third circuit breaker QF3 is connected between the first terminals of the three capacitors and the first terminals of the three reactors. The input terminal of the second current transformer 9 is connected to the second terminals of the three reactors one by one, and the output terminal is connected to processor 5. Air compressor inverter 3 is connected to the air compressor of the air conditioner and processor 5. The input terminal of fan inverter 4 is connected to switching module 1 via fourth circuit breaker QF4, and the output terminal is connected to the air conditioner fan and processor 5. The air conditioner fan is connected to processor 5. The power supply terminal of the power module is connected to one live wire and one neutral wire of the I-channel mains power supply and the II-channel mains power supply, respectively. The output terminal is connected to processor 5 and interaction module.

[0055] As an optional embodiment, the energy storage module 2 includes:

[0056] Three capacitors, with the first end of each capacitor connected to the output of switching module 1, and the second end of each capacitor grounded.

[0057] Three reactors are connected, with their first terminals connected to the first terminals of the three capacitors respectively, and their second terminals connected to the input terminal of the air compressor frequency converter 3.

[0058] Specifically, since the switching module 1 requires switching time to switch the AC power input, and the processor 5 also requires time to control the fan inverter 4 to convert the electrical energy output from the fan 7 and output it to the air compressor inverter 3 to power the air compressor 6, in order to prevent the air conditioner from stopping operation during these two periods of power switching, the power supply control system of the air conditioner in this application uses three capacitors and three reactors as energy storage modules 2. The energy stored in the three capacitors and three reactors can supply power to the air compressor 6 during the response and communication time before and after the processor 5 sends the command, thus preventing the air compressor 6 from stopping operation due to lack of power supply during AC power switching. The discharge time of the LC energy storage can be determined by matching the C / L and R parameters of the capacitor to meet the communication transmission time and response time between the current transformer, voltage transformer 10, processor 5, air compressor inverter 3, fan inverter 4 and system circuit during the AC power switching process of the switching module 1.

[0059] In addition, the energy storage module 2, consisting of three capacitors and three reactors, also has a filtering function. Current technology only utilizes reactors for filtering, but this method can only filter out harmonics of the 11th order and above, resulting in a harmonic content of around 5%. As the requirements for power grid quality increase, the requirements for harmonic mitigation also become more stringent. In some specific implementation scenarios, the harmonic content of air conditioners is required to be within 3%. Therefore, using a single reactor for filtering is insufficient to meet the harmonic mitigation requirements, necessitating an LC filtering scheme. To achieve the 3% harmonic content requirement, harmonics of the 7th order and above can be eliminated by matching the L / C parameters, ensuring that the power quality of the air conditioner connected to the grid meets the 3% harmonic content requirement.

[0060] As can be seen, the present invention uses three capacitors and three reactors as energy storage module 2. During the response and communication time before and after the processor 5 sends the instruction, the energy stored in the three capacitors and three reactors can supply power to the air compressor 6, avoiding the air compressor 6 from stopping operation due to lack of power supply during AC power switching. At the same time, the energy storage module 2 also has a filtering function, which can filter out harmonics above the 7th order, so that the power quality of the air conditioner connected to the power grid meets the requirements of harmonic content.

[0061] As an optional embodiment, it also includes:

[0062] Voltage transformer 10, the input terminal of voltage transformer 10 is connected to the output terminal of switching module 1, and the output terminal is connected to processor 5, used to detect the voltage of AC power output from the output terminal of switching module 1;

[0063] A current transformer, the input terminal of which is connected to the output terminal of the switching module 1, and the output terminal of which is connected to the processor 5, is used to detect the current of the AC power output from the output terminal of the switching module 1.

[0064] The frequency converter 4 controls the fan to convert the electrical energy output from the fan 7 and output it to the air compressor frequency converter 3, including:

[0065] Determine the phase angle of the AC voltage output by the output terminal of the switching module 1 when the current of the AC power output by the output terminal of the switching module 1 drops to a preset current threshold.

[0066] The control fan inverter 4 converts the electrical energy output by the fan 7 into AC power and outputs the AC power to the air compressor inverter 3. The initial phase angle of the AC power is consistent with the phase angle.

[0067] Specifically, to ensure that the phase angle of the AC voltage output by the fan inverter 4 when supplying power to the air compressor 6 from the fan 7 is consistent with that of the AC voltage output by the power supply when supplying power to the air compressor 6, thus avoiding damage to the fan 7 and air compressor 6 due to phase angle inconsistencies, this application needs to detect the current and voltage of the AC output at the output terminal of the switching module 1. When the current of the AC output at the output terminal of the switching module 1 drops to a preset current threshold, it indicates that one of the mains power supplies connected to the input terminal of the switching module 1 has experienced a power outage or power failure. The switching module 1 needs to switch to another mains power supply that has not experienced a power outage or power failure. At this time, it is necessary to determine the phase angle of the AC voltage output at the output terminal of the switching module 1, and control the fan inverter 4 to convert the power output from the fan 7 into AC voltage at an initial phase angle that is consistent with the phase angle of the AC voltage output at the output terminal of the switching module 1 determined when the current of the AC output at the output terminal of the switching module 1 drops to the preset current threshold. The AC voltage is then output to the air compressor inverter 3 to supply power to the air compressor 6.

[0068] As can be seen, the present invention first determines the phase angle of the AC voltage output by the switching module 1 when the power supply fails or loses power, so that the initial phase angle of the AC voltage output by the fan inverter 4 after converting the electrical energy output by the fan 7 to power the air compressor 6 is consistent with the phase angle of the AC voltage output by the switching module 1 when the power supply fails or loses power, thus avoiding the impact damage to the fan 7 and the air compressor 6 caused by the phase angle inconsistency.

[0069] As an optional embodiment, it also includes:

[0070] A current transformer, the input terminal of which is connected to the output terminal of the switching module 1, and the output terminal of which is connected to the processor 5, is used to detect the current of the AC power output from the output terminal of the switching module 1.

[0071] The control switching module 1 switches the AC power at its input terminal, including:

[0072] When the AC current at the output of switching module 1 drops to a preset current threshold, the switching module 1 is controlled to switch the AC current at the input.

[0073] Specifically, in order to accurately control the AC power output from the fan 7 after the energy storage module 2 and the fan inverter 4 convert the electrical energy output from the fan 7 to power the air compressor 6 at the moment when one of the mains power supplies fails or loses power, it is necessary to monitor the AC current at the output of the switching module 1 in real time. Because the current at the input of the current transformer suddenly becomes 0 at the moment the power supply fails or loses power, the preset current threshold can be set to 0. When the I-channel mains power supply fails or loses power, the first current transformer 8 will immediately detect that the A, B, and C phase currents are 0, and the processor 5 needs to immediately issue a command to control the switching module 1 to switch the AC power at the input.

[0074] As can be seen, the present invention can control the switching module 1 to immediately switch the AC power at the input terminal when the AC current at the output terminal of the switching module 1 drops to a preset current threshold, so as to ensure the normal operation of the power supply control system of the air conditioner and avoid system instability or failure due to insufficient current.

[0075] As an optional embodiment, it also includes:

[0076] The power module 11 has multiple input terminals connected to multiple AC power sources, and its output terminal connected to the processor 5. It is used to step down and rectify the AC power to obtain DC power.

[0077] As an optional embodiment, it also includes:

[0078] Interaction module 12 is connected to processor 5 and is used to control switching module 1 to select one AC power supply.

[0079] Specifically, since both processor 5 and interaction module 12 require a stable power supply to ensure their normal operation, and processor 5 and interaction module 12 typically use 24V DC power, while the mains voltage is generally 220V AC power, power module 11 is needed to step down and rectify the 220V AC power supply to convert it into the required 24V DC power to ensure the normal operation of processor 5 and interaction module 12. The power supply terminals of power module 11 are connected to one live wire and one neutral wire of both mains power supply I and mains power supply II, respectively. This allows it to switch to the other mains power supply when one mains power supply fails or loses power, ensuring uninterrupted power supply to processor 5 and interaction module 12. This allows interaction module 12 to control switching module 1 to select one AC power supply to connect.

[0080] For example, if the first circuit breaker Q1 is closed first, the I-channel mains power supply provides power to the air conditioner's power control system, maintaining the air conditioner's operation. When the I-channel mains power supply fails or drops, because the power module 11 has two power supplies, the first circuit breaker Q1 can be disconnected and the second circuit breaker Q2 closed, allowing the II-channel mains power supply to power the air conditioner's power control system. The power module 11 will not lose power and will continue to provide DC power to the processor 5 and the interaction module 12. The processor 5 and the interaction module 12 will remain operational, but the first current transformer 8 and the voltage transformer 10 will immediately detect a drop in the A, B, and C phase currents and voltages. The processor 5 will send a command to the switching module 1 to switch the AC power. The switching time of the switching module 1 is 100-200ms, and the communication and response time between the voltage transformer 10, the first current transformer 8, the processor 5, the air compressor inverter 3, and the fan inverter 4 is 6-10ms.

[0081] As can be seen, the present invention utilizes the power module 11 to perform voltage reduction and rectification respectively, converting the AC power of the power grid into the required DC power to provide uninterrupted power supply for the processor 5 and the interaction module 12, which can ensure the normal operation of the processor 5 and the interaction module 12, so that the interaction module 12 can control the switching module 1 to switch the AC power through the processor 5.

[0082] As an optional embodiment, the processor 5 is also used to control the fan 7 to a rated speed via the fan inverter 4 when the motor of the fan 7 is in an electric state.

[0083] Specifically, to ensure that the energy storage module 2 and the motor of the fan 7 (in generator mode) can continuously supply power to the air compressor 6 during the AC switching process of switching module 1, the energy stored in the energy storage module 2 and the energy generated by the motor of the fan 7 (in generator mode) due to inertia must be greater than or equal to the electrical energy consumed by the air compressor 6 during the AC switching process of switching module 1. However, the energy generated by the motor of the fan 7 due to inertia depends on the current rotational speed of the fan 7 and the mass of the fan blades. The power of the fan 7 is proportional to the cube of its rotational speed, which means that as the rotational speed increases, the power consumption will rise rapidly. When the rotational speed of the fan 7 exceeds a certain value, it will also cause the motor of the fan 7 to be overloaded, and may even burn out the motor of the fan 7. Therefore, when the motor of the fan 7 is in motor mode, the fan 7 should be kept within its rated speed as much as possible to avoid energy waste and equipment damage caused by overload or inefficient operation, thereby maximizing the efficiency of the fan 7.

[0084] As can be seen, the power supply control system for an air conditioner provided by the present invention keeps the fan 7 within its rated speed as much as possible when the motor of the fan 7 is in electric mode, so as to avoid energy waste and equipment damage caused by overload or inefficient operation, thereby maximizing the efficiency of the fan 7.

[0085] As an optional embodiment, the switching module 1 is an ATS.

[0086] Specifically, in existing technologies, the switching module 1 typically consists of a first contactor KM1 and a second contactor KM2. When the I-channel mains power supply fails or loses power, the processor 5 sends commands to control the on and off of the first contactor KM1 and the second contactor KM2 to switch the AC power. The switching time for AC contactors of 200A or higher is 0.6-1.2 seconds; the communication and response time for the voltage transformer 10, the first current transformer 8, the processor 5, the air compressor inverter 3, and the fan inverter 4 is 6-10 ms. This scheme, due to its long contactor switching time, increases the energy requirements of the energy storage module 2 and the energy generated by the inertia of the fan 7 motor in its power generation state. Furthermore, due to its low IP rating, the failure rate is relatively high when used outdoors.

[0087] In this application, ATS is used as the switching module 1. Since ATS has a fast switching speed, it can quickly cut off the power supply when a fault occurs, shorten the switching time of AC power switching, improve the accuracy of air conditioner temperature control, and ensure the safety and continuous power supply of the system.

[0088] It is evident that by using ATS as the switching module 1, the present invention achieves better reliability and economy while meeting the switching function requirements.

[0089] As an optional embodiment, the processor 5 is also configured to determine the fan speed of the fan 7 and the air compressor speed of the air compressor 6 when the AC power at the input of the switching module 1 is successfully switched, control the output power of the fan inverter 4 according to the fan speed of the fan 7 so that the initial speed of the fan 7 is the fan speed of the fan 7; and control the air compressor inverter 3 according to the air compressor speed of the air compressor 6 so that the initial speed of the air compressor 6 is the air compressor speed of the air compressor 6.

[0090] Specifically, the moment the ATS completes the switch from AC power supply I to AC power supply II, AC power supply II begins supplying power to the air conditioner's power control system, and the voltage and current at the ATS's output increase. At this moment, if the energy generated by the inertia of the AC power supply II and the motor of fan 7 causes a discrepancy between the fan speed and the air compressor speed, it will impact fan 7 and air compressor 6, potentially damaging them. Therefore, to avoid such impact, the air compressor inverter 3 and the fan inverter 4 need to track the speed of the fan 7 and the air compressor 6, confirming the fan speed of the fan 7 and the air compressor speed of the air compressor 6 when the AC power at the input of the switching module 1 is successfully switched. The air compressor inverter 3 and the fan inverter 4 are controlled, and the output power of the fan inverter 4 is controlled according to the fan speed so that the initial speed of the fan 7 is the fan speed. The air compressor inverter 3 is controlled according to the air compressor speed so that the initial speed of the air compressor 6 is the air compressor speed, avoiding damage to the fan 7 and the air compressor 6 caused by inconsistent speeds.

[0091] As can be seen, the power supply control system for an air conditioner provided by the present invention adds the speed tracking function of the air compressor inverter 3 and the fan inverter 4, so as to ensure that after the switching module 1 completes the AC power switching, the initial speed of the fan 7 and the initial speed of the air compressor 6 correspond to the fan speed and air compressor speed at the last moment when the switching module 1 completes the AC power switching, thereby avoiding the impact caused by the different speeds on the fan 7 and the air compressor 6.

[0092] The present invention also provides an air conditioner, including a fan 7 and an air compressor 6, and further including a power supply control system for the air conditioner as described above, wherein the power supply control system for the air conditioner is connected to the fan 7 and the air compressor 6 respectively.

[0093] It should be noted that the air conditioner's fan 7 can also blow air to output indoor air through the air outlet. The air conditioner also contains fan coil units, which are one of the core components of a central air conditioning system, primarily responsible for regulating indoor temperature and humidity to provide the required indoor environment for a specific scenario. The connection between the fan coil unit and the piping should preferably use flexible or soft hoses, with a pressure resistance value greater than or equal to 1.5 times the working pressure. Hose connections should be secure and free from twisting or collapse. Additionally, the air compressor 6 is one of the important components of the air conditioner, used to compress and cool air. The air compressor 6 has various piping connection methods, including flange connections, threaded connections, welding, grooved connections (clamp connections), compression fitting connections, press-fit connections, heat fusion connections, and socket connections. To prevent condensate backflow, the exhaust pipe of the air compressor 6 should connect to the main pipe from above.

[0094] Furthermore, for an introduction to an air conditioner provided by the invention, please refer to the above-described embodiment of the air conditioner's power supply control system; the invention will not be repeated here. These components are interconnected through various connection methods, ensuring the normal operation and high efficiency of the air conditioner.

[0095] As can be seen, the air conditioner provided by this invention can switch the switching module 1 to another AC power source when one AC power source fails or drops power. During this process, the energy storage module 2 supplies power to the air compressor 6, and the processor 5 controls the fan inverter 4 to convert the electrical energy output by the fan 7 motor (which is in a generator state due to inertia) and output it to the air compressor inverter 3 to supply power to the air compressor 6. In this way, the energy storage module, fan, and fan inverter can supply power to the air compressor during AC power switching, ensuring continuous power supply to the air compressor and preventing the air conditioner from stopping during power switching, thus achieving the requirement of uninterrupted operation of the air conditioner for 24 hours.

[0096] It should be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0097] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply control system for an air conditioner, characterized in that, include: The switching module has multiple input terminals connected to multiple AC power sources, and its output terminals connected to the air compressor frequency converter, the fan frequency converter, and the energy storage module, respectively. The energy storage module is connected to the air compressor frequency converter and is used to store energy when AC power is output at the output terminal of the switching module, and to output electrical energy to the air compressor frequency converter when AC power is stopped at the output terminal of the switching module. The air compressor frequency converter is connected to the air compressor of the air conditioner; The fan inverter is connected to the air conditioner fan; The processor is connected to the switching module, the air compressor frequency converter, and the fan frequency converter respectively, and is used to control the fan frequency converter to convert the electrical energy output by the fan and output it to the air compressor frequency converter when controlling the switching module to switch the AC power at the input terminal. The energy storage module includes: Three capacitors, the first terminals of the three capacitors are respectively connected to the output terminal of the switching module, and the second terminals of the three capacitors are all grounded; Three reactors, the first end of each of the three reactors is connected to the first end of the three capacitors respectively, and the second end is connected to the input end of the air compressor frequency converter.

2. The power supply control system for the air conditioner as described in claim 1, characterized in that, Also includes: A voltage transformer, the input terminal of which is connected to the output terminal of the switching module, and the output terminal of which is connected to the processor, is used to detect the voltage of the AC power output from the output terminal of the switching module; A current transformer, the input terminal of which is connected to the output terminal of the switching module, and the output terminal of which is connected to the processor, is used to detect the current of the AC power output from the output terminal of the switching module; Controlling the fan frequency converter to convert the electrical energy output by the fan and output it to the air compressor frequency converter includes: Determine the phase angle of the AC voltage output by the switching module when the current of the AC output at the output terminal of the switching module drops to a preset current threshold. The frequency converter controls the fan to convert the electrical energy output by the fan into alternating current and outputs the alternating current to the frequency converter of the air compressor, wherein the initial phase angle of the alternating current is consistent with the phase angle.

3. The power supply control system for the air conditioner as described in claim 1, characterized in that, Also includes: A current transformer, the input terminal of which is connected to the output terminal of the switching module, and the output terminal of which is connected to the processor, is used to detect the current of the AC power output from the output terminal of the switching module; Controlling the switching module to switch the AC power at its input terminal includes: When the AC current at the output of the switching module drops to a preset current threshold, the switching module is controlled to switch the AC current at the input.

4. The power supply control system for an air conditioner as described in claim 1, characterized in that, Also includes: The power module has multiple input terminals connected to multiple AC power sources and an output terminal connected to the processor. It is used to step down and rectify the AC power to obtain DC power.

5. The power supply control system for an air conditioner as described in claim 1, characterized in that, Also includes: An interaction module, connected to the processor, is used to control the switching module to select one AC power supply to be connected.

6. The power supply control system for an air conditioner as described in claim 1, characterized in that, The processor is also used to control the fan to a rated speed via the fan frequency converter when the fan motor is in an electric state.

7. The power supply control system for an air conditioner according to claim 1, characterized in that, The switching module is an ATS.

8. The power supply control system for an air conditioner according to any one of claims 1 to 7, characterized in that, The processor is also configured to determine the fan speed and the air compressor speed of the fan and the air compressor when the AC power at the input of the switching module is successfully switched, control the output power of the fan inverter according to the fan speed so that the initial speed of the fan is the fan speed; and control the air compressor inverter according to the air compressor speed so that the initial speed of the air compressor is the air compressor speed.

9. An air conditioner, characterized in that, It includes a fan and an air compressor, and also includes a power supply control system for an air conditioner as described in any one of claims 1 to 8, wherein the power supply control system for the air conditioner is connected to the fan and the air compressor respectively.

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