Power supply control system of air conditioner and air conditioner

Abstract

The invention discloses a power supply control system of an air conditioner and the air conditioner, and relates to the technical field of air conditioners, a plurality of input ends of a switching module are respectively connected with a plurality of paths of alternating current, an output end of the switching module is respectively connected with an air compressor frequency converter, a fan frequency converter and an energy storage module, and the energy storage module is connected with the air compressor frequency converter. The processor is used for storing energy when the output end of the switching module outputs the alternating current and outputting electric energy to the air compressor frequency converter when the output end of the switching module stops outputting the alternating current, and the processor is connected with the switching module, the air compressor frequency converter and the fan frequency converter. And the control module is used for controlling the fan frequency converter to convert the electric energy output by the fan and output the converted electric energy to the air compressor frequency converter when the control switching module switches the alternating current of the input end. In the alternating current switching process, the energy storage module, the draught fan and the draught fan frequency converter supply power to the air compressor, continuous power supply of the air compressor is guaranteed, the air conditioner is prevented from stopping running in the power supply switching process, and the requirement that the air conditioner does not stop within 24 h is met.

Description

Technical Field

[0001] The present invention relates to the field of air conditioners, and in particular to a power supply control system of an air conditioner and the air conditioner. Background Art

[0002] Some spaces, such as data centers, have strict requirements for refrigeration, requiring air conditioners to work without stopping for 24 hours. At present, in order to meet the requirement of air conditioners not stopping for 24 hours, two power supplies, namely, mains power supply I and mains power supply II, are usually provided to the air conditioner. Specifically, the two power supplies are connected to the air compressor and fan of the air conditioner through two contactors respectively. At the same time, only one contactor is turned on and the other contactor is turned off to realize that one power supply supplies power to the air compressor and fan of the air conditioner.

[0003] In the process of realizing the invention, the inventors found that there are at least the following problems in the prior art: when a mains power supply fails or loses power, the mains power supply that fails or loses power is switched to another normal mains power supply by switching the contactor. However, the switching time of the contactor is relatively long, which will cause the air compressor and the fan to shut down first and then restart after the contactor switching is completed, which is difficult to meet the requirement of non-stop air conditioning. Summary of the invention

[0004] The purpose of the present invention is to provide an air conditioner power supply control system and an air conditioner, which can power an air compressor with an energy storage module, a fan and a fan inverter during the switching of alternating current, thereby preventing the air conditioner from stopping during the power switching process, so as to achieve the requirement of non-stop operation of the air conditioner within 24 hours.

[0005] In order to solve the above technical problems, the present invention provides a power supply control system for an air conditioner, comprising:

[0006] A switching module, wherein the multiple input ends of the switching module are respectively connected to multiple AC power channels, and the output ends are respectively connected to the air compressor inverter, the fan inverter and the energy storage module;

[0007] The energy storage module is connected to the air compressor inverter and is used to store energy when the output end of the switching module outputs AC power, and output electric energy to the air compressor inverter when the output end of the switching module stops outputting AC power;

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

[0009] The fan frequency converter is connected to the fan of the air conditioner;

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

[0011] Optionally, the energy storage module includes:

[0012] Three capacitors, wherein the first ends of the three capacitors are connected to the output end of the switching module in a one-to-one correspondence, and the second ends of the three capacitors are grounded;

[0013] Three reactors, the first ends of the three reactors are connected to the first ends of the three capacitors one by one, and the second ends are connected to the input end of the air compressor inverter.

[0014] Optionally, also include:

[0015] A voltage transformer, the input end of which is connected to the output end of the switching module, and the output end of which is connected to the processor, and is used to detect the voltage of the alternating current outputted from the output end of the switching module;

[0016] A current transformer, the input end of which is connected to the output end of the switching module, and the output end of which is connected to the processor, for detecting the current of the alternating current outputted from the output end of the switching module;

[0017] Controlling the fan inverter to convert the electric energy output by the fan and output it to the air compressor inverter, comprising:

[0018] Determine the phase angle of the voltage of the alternating current outputted from the output end of the switching module when the current of the alternating current outputted from the output end of the switching module drops to a preset current threshold;

[0019] The fan inverter is controlled to convert the electric energy output by the fan into alternating current and output the alternating current to the air compressor inverter, wherein an initial phase angle of the alternating current is consistent with the phase angle.

[0020] Optionally, also include:

[0021] A current transformer, the input end of which is connected to the output end of the switching module, and the output end of which is connected to the processor, for detecting the current of the alternating current outputted from the output end of the switching module;

[0022] Controlling the switching module to switch the alternating current at the input end includes:

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

[0024] Optionally, also include:

[0025] A power supply module, wherein multiple input terminals of the power supply module are respectively connected to multiple alternating currents, and an output terminal is connected to the processor, and is used to step down and rectify the alternating currents to obtain direct currents.

[0026] Optionally, also include:

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

[0028] Optionally, the processor is further configured to control the fan to be at a rated speed through the fan inverter when the motor of the fan is in an electric state.

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

[0030] Optionally, the processor is also used to determine the fan speed of the fan and the air compressor speed of the air compressor when the alternating current at the input end of the switching module is successfully switched, and control the output electric energy 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 technical problems, the present invention also provides an air conditioner, comprising a fan and an air compressor, and also comprising a power supply control system of the air conditioner as described above, wherein the power supply control system of the air conditioner is respectively connected to the fan and the air compressor.

[0032] The present application provides a power supply control system and an air conditioner for an air conditioner, wherein the power supply control system for the air conditioner includes a switching module, an energy storage module, an air compressor inverter, a fan inverter, and a processor, wherein the processor can control the switching module to switch to another AC power line that is not powered off or powered off when one AC power line is powered off or powered off, and the energy storage module can power the air compressor of the air conditioner during the AC power switching process, and at the same time, the processor will control the fan inverter to convert the electric energy output by the fan motor in the power generation state due to inertia and output it to the air compressor inverter to power the air compressor. In this way, the energy storage module, the fan, and the fan inverter can power the air compressor during the AC power switching process, ensuring the continuous power supply of the air compressor and avoiding the air conditioner from stopping during the power switching process, so as to achieve the requirement that the air conditioner does not stop within 24 hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. 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 creative work.

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

[0035] Figure 2 A schematic structural diagram of a specific air-conditioning power supply control system provided by the present invention. DETAILED DESCRIPTION

[0036] The core of the present invention is to provide an air conditioner power supply control system and an air conditioner, which can power the air compressor with an energy storage module, a fan and a fan inverter during the switching of alternating current, thereby preventing the air conditioner from stopping during the power switching process, so as to achieve the requirement of non-stop operation of the air conditioner within 24 hours.

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In order to solve the problem that the air conditioner stops running during the power switching process, the inventor of the present invention first considered adding a back-type UPS (Uninterruptible Power Supply) power supply when the AC power supply is cut off or lost, while the switching module 1 automatically switches the AC power supply. When the switching module 1 switches the AC power, there is no current output for a moment (100-200ms), the current transformer detects 0 current, and the processor 5 automatically sends a command to the UPS, so that the UPS supplies power to the air compressor to ensure that the entire air conditioner continues to operate uninterruptedly. When the switching module 1 completes the switching of the AC power, the current transformer will detect that the switching module 1 has a current output, and the processor 5 sends a command to the UPS, so that the UPS stops the power output, and the UPS will enter a sleep state or a charging state.

[0039] This solution allows the UPS to power the air compressor during the process of switching the AC power supply by the switching module 1 to ensure the continuous operation of the entire air-conditioning equipment. However, this solution is likely to cause overcurrent and overvoltage shocks to the UPS and the air compressor inverter and fan inverter at the moment when the switching module 1 is switched, due to the large current and voltage output by the switching module 1, resulting in damage to the UPS and the air compressor inverter and fan inverter. At the same time, because the phase angle of the AC power supply after the switching is difficult to keep consistent with the phase angle of the UPS output power supply, it will also cause voltage shocks to the UPS and the air compressor inverter and fan inverter, which is easy to damage the UPS and the air compressor inverter and fan inverter, resulting in increased maintenance costs. In addition, the UPS itself is relatively expensive and occupies a certain volume of space, which will increase the cost and space volume of the entire device, and is not economical.

[0040] In order to solve the above technical problems, the present invention provides a power supply control system for an air conditioner.

[0041] Specifically, see Figure 1 As shown, Figure 1 A schematic diagram of the structure of a power supply control system for an air conditioner provided by the present invention. Figure 1 In the above, a case where multiple AC power supplies include a mains power supply I and a mains power supply II is taken as an example.

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

[0043] Switching module 1, multiple input terminals of the switching module are respectively connected to multiple AC power channels, and the output terminals are respectively connected to the air compressor inverter, the fan inverter and the energy storage module;

[0044] Energy storage module 2, connected to the air compressor inverter, for storing energy when the output end of the switching module outputs AC power, and outputting electric energy to the air compressor inverter when the output end of the switching module stops outputting AC power;

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

[0046] A fan inverter 4 is connected to a fan 7 of an air conditioner;

[0047] The processor 5 is connected to the switching module 2, the air compressor inverter 3 and the fan inverter 4 respectively, and is used to control the fan inverter 4 to convert the electric energy output by the fan 7 and output it to the air compressor inverter 3 when the switching module 2 switches the AC power at the input end.

[0048] The power supply control system of the 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 the air compressor is first powered, the processor 5 controls the switching module 1 to select a mains power supply to power the air compressor. At the same time, the energy storage module 2 is charged and the energy storage module 2 stores energy. When the mains power supply is cut off or loses power, the processor 5 controls the switching module 1 to switch from the mains power supply that is cut off or loses power to the mains power supply that is not cut off or loses power. At the same time, in the process of controlling the switching module 1 to switch the AC power at the input end, the energy storage module 2 supplies power to the air compressor. It should also be noted that during the switching process of the switching module 1, there is no power supply to the fan 7. Due to inertia, the fan 7 is in a power generation state. This solution utilizes the electric energy generated by the fan 7 in the power generation state, and controls the fan inverter 4 to convert the electric energy output by the fan 7 and output it to the air compressor inverter 3 to power the air compressor 6, thereby ensuring that the air compressor 6 has power throughout the switching process of the switching module 1, thereby achieving the requirement of non-stop air conditioning.

[0049] Among them, the processor 5 can be a PLC (Programmable Logic Controller). PLC has high reliability and strong anti-interference ability. It can effectively deal with various interferences in the industrial environment, so as to ensure the stable operation of the system. In addition, PLC is small in size, light in weight, low in power consumption, easy to install, and does not require a dedicated machine room or strict shielding measures, which makes it very suitable for applications with limited space or low energy consumption. PLC also has a large storage capacity and a powerful I / O interface, and can be connected to a distributed factory automation system for supervision and monitoring, so as to achieve efficient, reliable and flexible control.

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

[0051] Furthermore, in order to ensure that the air conditioner does not stop within 24 hours during the process of controlling the switching module 1 to switch the AC power at the input end, in actual applications, the total energy of the energy stored in the energy storage module 2 and the energy generated by the inertia of the fan motor in the power generation state must not be less than the electric energy consumed by the air compressor during the switching process of the switching module 1.

[0052] It can be seen that the power supply control system of the air conditioner provided by the present invention can control the switching module 1 to switch to other AC power lines that are not powered off or powered off when one AC power line is powered off or powered off, and the energy storage module 2 will power the air compressor of the air conditioner, and at the same time, the processor 5 will control the fan inverter 4 to convert the electric energy output by the fan motor in the power generation state due to inertia and output it to the air compressor inverter 3 to power the air compressor. In this way, the energy storage module, fan and fan inverter can power the air compressor during the switching process of AC power, ensuring the continuous power supply of the air compressor and avoiding the air conditioner from stopping during the power switching process, so as to achieve the requirement of non-stopping the air conditioner within 24 hours.

[0053] Based on the above embodiments:

[0054] The present invention takes two power supply sources, mains power supply I and mains power supply II, as an example. Figure 2 As shown, Figure 2The schematic diagram of the structure of a specific air conditioner power supply control system provided by the present invention. The air conditioner power supply control system specifically comprises two power supplies, namely, a mains power supply I and a mains power supply 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, a first reactor L1, a second reactor L2, a third reactor L3, a power supply module 11 and an interactive module 12 are composed. The mains power supply I and the mains power supply II are connected to the switching module 1 by the first circuit breaker QF1 and the second circuit breaker QF2 respectively. The output end 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 end of the voltage transformer 10 is connected to the output end of the switching module 1, and the output end is connected to the processor 5. The input end of the current transformer 8 is connected to the output end of the switching module 1, and the output end is connected to the processor 5. The first ends of the three capacitors are connected to the output end of the switching module 1 one by one, and the second ends are all grounded. The first ends of the three reactors are connected to the first ends of the three capacitors one by one, and the second ends are connected to the input end of the air compressor inverter 3. The third circuit breaker QF3 is connected between the first ends of the three capacitors and the first ends of the three reactors. The input end of the second current transformer 9 is connected to the second ends of the three reactors one by one, and the output end is connected to the processor 5. The air compressor inverter 3 is connected to the air compressor and processor 5 of the air conditioner. The input end of the fan inverter 4 is connected to the switching module 1 via the fourth circuit breaker QF4, and the output end is connected to the fan of the air conditioner and the processor 5. The fan of the air conditioner is connected to the processor 5. The power supply end of the power supply module is respectively connected to a live wire and a neutral wire of the I-way mains power supply and the II-way mains power supply, and the output end is connected to the processor 5 and the interactive module.

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

[0056] Three capacitors, the first ends of the three capacitors are connected to the output end of the switching module 1 one by one, and the second ends of the three capacitors are grounded;

[0057] Three reactors, the first ends of the three reactors are connected to the first ends of the three capacitors one by one, and the second ends are connected to the input end of the air compressor inverter 3.

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

[0059] In addition, three capacitors and three reactors are used as energy storage module 2, which also has a filtering function. In the prior art, only reactors are used for filtering, but the effect of filtering using only reactors can only filter out harmonics above the 11th order, and the harmonic content is about 5%. As the requirements for the quality of the power grid become higher, the requirements for the control of power grid harmonics are also getting higher and higher. In some specific implementation scenarios, the harmonic content of the air conditioner is required to be within 3%, so it is difficult to meet the harmonic control requirements by filtering with a single reactor, and an LC filtering solution is required. In order to meet the requirements of harmonic content within 3%, the harmonics above the 7th order can be eliminated by matching the parameters of L\C, so that the power quality of the air conditioner connected to the power grid meets the requirements of harmonic content within 3%.

[0060] It can be seen that the present invention uses three capacitors and three reactors as the energy storage module 2. The energy stored in the three capacitors and three reactors can be used to power the air compressor 6 during the response and communication time before and after the processor 5 sends the instruction, so as to prevent the air compressor 6 from stopping due to lack of power supply during the AC power switching process. At the same time, the energy storage module 2 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 the harmonic content.

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

[0062] A voltage transformer 10, the input end of the voltage transformer 10 is connected to the output end of the switching module 1, and the output end is connected to the processor 5, and is used to detect the voltage of the alternating current output by the output end of the switching module 1;

[0063] A current transformer, the input end of which is connected to the output end of the switching module 1, and the output end of which is connected to the processor 5, and is used to detect the current of the alternating current outputted from the output end of the switching module 1;

[0064] Control the fan inverter 4 to convert the electric energy output by the fan 7 and output it to the air compressor inverter 3, including:

[0065] Determine the phase angle of the voltage of the alternating current outputted from the output end of the switching module 1 when the current of the alternating current outputted from the output end of the switching module 1 drops to a preset current threshold;

[0066] The fan inverter 4 is controlled to convert the electric energy output by the fan 7 into alternating current and output the alternating current to the air compressor inverter 3, wherein the initial phase angle of the alternating current is consistent with the phase angle.

[0067] Specifically, in order to make the phase angle of the voltage of the AC power output by the fan inverter 4 when the fan 7 supplies power to the air compressor 6 consistent with that of the voltage of the AC power output by the power supply when the power supply supplies power to the air compressor 6, and avoid the impact caused by the inconsistent phase angle from damaging the fan 7 and the air compressor 6. The present application needs to detect the current and voltage of the AC power output from the output end of the switching module 1. When the current of the AC power output from the output end of the switching module 1 drops to the preset current threshold, it indicates that a mains power supply connected to the input end of the switching module 1 has a power outage or power failure, and the switching module 1 needs to switch to another mains power supply that has not been powered off or powered off. At this time, it is necessary to determine the phase angle of the voltage of the AC power output from the output end of the switching module 1, and control the fan inverter 4 to convert the electric energy output by the fan 7 into the AC power so that the initial phase angle is consistent with the phase angle of the voltage of the AC power output from the output end of the switching module 1 when the current of the AC power output from the output end of the switching module 1 drops to the preset current threshold, and output the AC power to the air compressor inverter 3 to power the air compressor 6.

[0068] It can be seen that the present invention first determines the phase angle of the voltage of the alternating current output from the output end of the switching module 1 when the power supply fails or loses power, so that the initial phase angle of the alternating current output by the fan inverter 4 after converting the electric energy output by the fan 7 to power the air compressor 6 is consistent with the phase angle of the voltage of the alternating current output from the output end of the switching module 1 determined when the power supply fails or loses power, thereby avoiding the impact caused by inconsistent phase angles and damaging the fan 7 and the air compressor 6.

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

[0070] A current transformer, the input end of which is connected to the output end of the switching module 1, and the output end of which is connected to the processor 5, and is used to detect the current of the alternating current outputted from the output end of the switching module 1;

[0071] Controlling the switching module 1 to switch the AC power at the input end includes:

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

[0073] Specifically, in order to accurately control the energy storage module 2 and the fan inverter 4 to convert the electric energy output by the fan 7 into AC power to power the air compressor 6 at the moment when one of the mains power supplies is cut off or powered off, it is necessary to detect the current of the AC power at the output end of the switching module 1 in real time. Because the current at the input end of the current transformer suddenly changes to 0 at the moment when the power supply is cut off or powered off, the preset current threshold can be set to 0. When the first current transformer 8 immediately detects that the A\B\C three-phase current is 0 at the moment when the mains power supply I is cut off or powered off, the processor 5 needs to immediately issue an instruction to control the switching module 1 to switch the AC power at the input end.

[0074] It can be seen that the present invention can control the switching module 1 to immediately switch the AC power at the input end when the current of the AC power at the output end 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 caused by insufficient current.

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

[0076] The power module 11 has multiple input terminals connected to multiple AC power supplies, and an output terminal connected to the processor 5 for respectively stepping down and rectifying the AC power to obtain DC power.

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

[0078] The interaction module 12 is connected to the processor 5 and is used to control the switching module 1 to select one AC power line to be connected.

[0079] Specifically, because the processor 5 and the interactive module 12 both need a stable power supply to ensure their normal operation, the processor 5 and the interactive module 12 usually use 24V DC, while the grid voltage is generally 220V AC. Therefore, it is necessary to step down and rectify the 220V AC of the power supply through the power module 11, and convert it into the required 24V DC to ensure the normal operation of the processor 5 and the interactive module 12. Among them, the power supply end of the power module 11 is respectively connected to a live wire and a neutral wire of the I-way mains power supply and the II-way mains power supply, and can switch to another mains power supply that is not cut off or powered off when one mains power supply is cut off or powered off, so as to provide uninterrupted power to the processor 5 and the interactive module 12, so that the interactive module 12 controls the switching module 1 to select one AC power supply to be connected.

[0080] For example, if the first circuit breaker Q1 is closed first, the I-way mains power supply will supply power to the power supply control system of the air conditioner to maintain the operation of the air conditioner. When the I-way mains power supply is out of power or loses power, because the power module 11 is powered by two power supplies, the first circuit breaker Q1 can be disconnected and the second circuit breaker Q2 can be closed, and the II-way mains power supply will supply power to the power supply control system of the air conditioner. The power module 11 will not lose power and will continue to provide DC power to the processor 5 and the interactive module 12. The processor 5 and the interactive module 12 are always in operation, but the first current transformer 8 and the voltage transformer 10 will immediately detect that the A\B\C three-phase current and voltage are reduced, and the processor 5 sends instructions to the switching module 1 to switch the AC power. Among them, the switching time of the switching module 1 requires 100-200ms, and the communication and response time of the voltage transformer 10, the first current transformer 8, the processor 5, the air compressor inverter 3, and the fan inverter 4 requires 6-10ms.

[0081] It can be seen that the present invention utilizes the power supply module 11 to perform step-down and rectification respectively, and converts the AC power of the power grid into the required DC power to provide uninterrupted power supply to the processor 5 and the interactive module 12, thereby ensuring the normal operation of the processor 5 and the interactive module 12, so that the interactive module 12 controls the switching module 1 to switch the AC power through the processor 5.

[0082] As an optional embodiment, the processor 5 is further configured to control the fan 7 to be at a rated speed through the fan inverter 4 when the motor of the fan 7 is in an electric state.

[0083] Specifically, in order to satisfy the requirement that the energy storage module 2 and the motor of the fan 7 in the power generation state can always supply power to the air compressor 6 during the process of the switching module 1 switching the AC power, the energy stored in the energy storage module 2 and the energy generated by the motor of the fan 7 in the power generation state due to inertia need to be greater than or equal to the electric energy consumed by the air compressor 6 during the process of the switching module 1 switching the AC power. However, the energy generated by the motor of the fan 7 due to inertia depends on the speed of the fan 7 at that time and the mass of the fan blades of the fan 7. The power of the fan 7 is proportional to the cube of the speed, which means that as the speed increases, the power consumption will increase rapidly. When the speed of the fan 7 is greater than a certain value, it will also cause the motor of the fan 7 to be overloaded, and may even burn the motor of the fan 7. For this reason, when the motor of the fan 7 is in the electric state, the fan 7 should be kept within the rated speed as much as possible to avoid energy waste and equipment damage caused by overload or inefficient operation, so that the fan 7 can play the maximum efficiency.

[0084] It can be seen that the power supply control system of an air conditioner provided by the present invention keeps the fan 7 within the rated speed as much as possible when the motor of the fan 7 is in the electric state, avoiding energy waste and equipment damage caused by overload or inefficient operation, thereby allowing the fan 7 to perform at its maximum efficiency.

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

[0086] Specifically, in the prior art, the switching module 1 is usually a first contactor KM1 and a second contactor KM2. When the mains power supply I fails or loses power, the processor 5 sends instructions to control the on and off of the first contactor KM1 and the second contactor KM2 to switch the AC power; wherein, the switching time of the AC contactor above 200A requires 0.6-1.2s; the communication and response time of the voltage transformer 10, the first current transformer 8, the processor 5, the air compressor inverter 3, and the fan inverter 4 requires 6-10ms. Due to the long contactor switching time, this solution has higher requirements for the energy stored in the energy storage module 2 and the energy generated by the motor of the fan 7 in the power generation state due to inertia. At the same time, due to the low IP level, the failure rate is relatively high when used outdoors.

[0087] In the present application, ATS is used as the switching module 1. Since ATS has a fast conversion speed, it can quickly cut off the power supply when a fault occurs, shortening the switching time of the AC power switching, improving the accuracy of the air conditioner's temperature control, and ensuring the safety and continuous power supply of the system.

[0088] It can be seen that the present invention uses ATS as the switching module 1, which has better reliability and economy while meeting the switching function requirements.

[0089] As an optional embodiment, the processor 5 is also used 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 end of the switching module 1 is successfully switched, and control the output electric energy of the fan inverter 4 according to the fan speed so that the initial speed of the fan 7 is the fan speed; control the air compressor inverter 3 according to the air compressor speed so that the initial speed of the air compressor 6 is the air compressor speed.

[0090] Specifically, when the ATS completes the switching of the AC power from the mains power supply line I to the mains power supply line II, the mains power supply line II starts to supply power to the power supply control system of the air conditioner, and the voltage and current at the output end of the ATS increase. At this time, if the energy generated by the mains power supply line II and the motor of the fan 7 due to inertia causes the fan speed and the air compressor speed to be inconsistent, it will bring impact to the fan 7 and the air compressor 6, causing damage to the fan 7 and the air compressor 6. Therefore, in order to avoid such impact, the air compressor inverter 3 and the fan inverter 4 are required to track the speed of the fan 7 and the air compressor 6, confirm the fan speed of the fan 7 and the air compressor speed of the air compressor 6 when the AC power at the input end of the switching module 1 is successfully switched, control the air compressor inverter 3 and the fan inverter 4, control the output electric energy of the fan inverter 4 according to the fan speed, so that the initial speed of the fan 7 is the fan speed, control the air compressor inverter 3 according to the air compressor speed, so that the initial speed of the air compressor 6 is the air compressor speed, and avoid damage to the fan 7 and the air compressor 6 caused by inconsistent speeds.

[0091] It can be seen that the power supply control system of an air conditioner provided by the present invention adds the speed tracking function of the air compressor inverter 3 and the fan inverter 4 to ensure that after the switching module 1 completes the switching of the alternating current, the initial speed of the fan 7 and the initial speed of the air compressor 6 correspond to the fan speed and the air compressor speed at the last moment when the switching module 1 completes the switching of the alternating current, respectively, to avoid damage to the fan 7 and the air compressor 6 caused by the impact of different speeds.

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

[0093] It should be noted that the fan 7 of the air conditioner can also output the indoor air through the air outlet by blowing air flow. There is also a fan coil in the air conditioner. The fan coil is one of the core components in the central air conditioning system, which is mainly responsible for adjusting the indoor temperature and humidity, thereby providing the indoor environment required for the specific scene. The connection between the fan coil and the pipeline should adopt an elastic pipe or a soft pipe, and its pressure resistance value should be greater than or equal to 1.5 times the working pressure. The connection of the hose should be firm and there should be no strong twisting and flat pipe. In addition, the air compressor 6 is one of the important components in the air conditioner, which is used to compress and cool the air. There are many ways to connect the pipes of the air compressor 6, including flange connection, threaded connection, welding, groove connection (clamp connection), sleeve connection, compression connection, hot melt connection and socket connection. In order to avoid the reflux of condensed water, the exhaust pipe of the air compressor 6 should be connected to the main pipe from above.

[0094] In addition, the introduction of an air conditioner provided by the invention can be referred to the embodiment of the power supply control system of the air conditioner, and the invention will not be repeated here. These components are connected to each other through various connection methods to ensure the normal operation and high efficiency of the air conditioner.

[0095] It can be seen that the air conditioner provided by the present invention can control the switching module 1 to switch to another AC power that is not cut off or powered off when one AC power is cut off or powered off, and the energy storage module 2 can supply power to the air compressor 6 of the air conditioner, and at the same time, the processor 5 can control the fan inverter 4 to convert the electric energy output by the motor of the fan 7 in the power generation 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, the fan and the fan inverter can supply power to the air compressor during the switching process of the AC power, ensuring the continuous power supply of the air compressor and avoiding the air conditioner from stopping during the power switching process, so as to achieve the requirement of non-stopping of the air conditioner within 24 hours.

[0096] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0097] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to 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: A switching module, wherein the multiple input ends of the switching module are respectively connected to multiple AC power channels, and the output ends are respectively connected to the air compressor inverter, the fan inverter and the energy storage module; The energy storage module is connected to the air compressor inverter and is used to store energy when the output end of the switching module outputs AC power, and output electric energy to the air compressor inverter when the output end of the switching module stops outputting AC power; The air compressor inverter is connected to the air compressor of the air conditioner; The fan frequency converter is connected to the fan of the air conditioner; The processor is connected to the switching module, the air compressor inverter and the fan inverter respectively, and is used to control the fan inverter to convert the electric energy output by the fan and output it to the air compressor inverter when controlling the switching module to switch the AC power at the input end.

2. The power supply control system of the air conditioner according to claim 1, characterized in that: The energy storage module comprises: Three capacitors, wherein the first ends of the three capacitors are connected to the output end of the switching module in a one-to-one correspondence, and the second ends of the three capacitors are grounded; Three reactors, the first ends of the three reactors are connected to the first ends of the three capacitors one by one, and the second ends are connected to the input end of the air compressor inverter.

3. The power supply control system of the air conditioner according to claim 2, characterized in that: Also includes: A voltage transformer, the input end of which is connected to the output end of the switching module, and the output end of which is connected to the processor, and is used to detect the voltage of the alternating current outputted from the output end of the switching module; A current transformer, the input end of which is connected to the output end of the switching module, and the output end of which is connected to the processor, for detecting the current of the alternating current outputted from the output end of the switching module; Controlling the fan inverter to convert the electric energy output by the fan and output it to the air compressor inverter, comprising: Determine the phase angle of the voltage of the alternating current outputted from the output end of the switching module when the current of the alternating current outputted from the output end of the switching module drops to a preset current threshold; The fan inverter is controlled to convert the electric energy output by the fan into alternating current and output the alternating current to the air compressor inverter, wherein an initial phase angle of the alternating current is consistent with the phase angle.

4. The power supply control system for an air conditioner according to claim 1, characterized in that: Also includes: A current transformer, the input end of which is connected to the output end of the switching module, and the output end of which is connected to the processor, for detecting the current of the alternating current outputted from the output end of the switching module; Controlling the switching module to switch the alternating current at the input end includes: When the current of the alternating current at the output end of the switching module drops to a preset current threshold, the switching module is controlled to switch the alternating current at the input end.

5. The power supply control system for an air conditioner according to claim 1, characterized in that: Also includes: A power supply module, wherein multiple input terminals of the power supply module are respectively connected to multiple alternating currents, and an output terminal is connected to the processor, and is used to step down and rectify the alternating currents to obtain direct currents.

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

7. The power supply control system for an air conditioner according to claim 1, characterized in that: The processor is also used to control the fan to be at a rated speed through the fan inverter when the motor of the fan is in an electric state.

8. The power supply control system of the air conditioner according to claim 1, characterized in that: The switching module is ATS.

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

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

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