Air conditioner and control method of air conditioner

Abstract

This invention proposes an air conditioner and its control method. The air conditioner includes: a power conversion module, whose input terminal is connected to an AC power source to convert the AC power provided by the AC power source into a first DC voltage suitable for powering a main chip control module and outputting it; a signal detection module, one end of which receives various DRED frequency modulation signals transmitted from the power grid, and the other end is connected to the signal detection port of the main chip control module to convert different DRED frequency modulation signals into corresponding voltage signals; an isolated power supply module, whose input terminal is connected to the output terminal of the power conversion module, and whose output terminal is connected to the power supply terminal of the signal detection module. This module converts the first DC voltage into a second DC voltage to power the signal detection module and enable it to operate; and the main chip control module is used to control the on / off state of the isolated power supply module as needed. This invention designs a low-voltage isolated power supply, providing power to the signal detection module as needed and shutting it off when appropriate, thereby effectively reducing costs and energy consumption and improving the reliability of air conditioner operation.

Description

Technical Field

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

[0002] With rising global temperatures and the increasing number of electrical appliances, the simultaneous operation of various electrical products, including air conditioners, during peak electricity consumption can exceed the overall grid load, causing grid protection systems to malfunction and, in severe cases, damaging grid equipment. To address this, relevant management departments require electrical appliances to be linked with grid dispatching to regulate power consumption during peak hours and prevent grid overload. For example, in some regions, management departments use Demand Response Electrical Devices (DRED) to issue frequency-limiting control commands to localized air conditioners and other electrical appliances based on grid load conditions, causing them to enter DRED mode. Currently, air conditioners in DRED mode typically operate at three power levels, limited to 75%, 50%, or 0% of their rated power.

[0003] In existing technologies, the signal detection interface provided by the smart grid and the control circuit of the air conditioner are not in the same power system. Furthermore, for safety and reliability, an isolated power supply is typically provided to the grid signal detection interface. Current solutions usually involve designing a separate power supply circuit for this purpose, which is costly. Moreover, this power supply circuit operates continuously during air conditioner operation, resulting in high power consumption. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] Therefore, one objective of this invention is to provide an air conditioner that, through a low-cost approach, adds only a low-voltage side isolated power supply module and a power output control port to the main chip control module. When signal detection is needed, the isolated power supply module is activated to provide isolated power to the signal detection module, enabling it to operate for signal detection. After detection is complete, the power supply circuit of the isolated power supply module is shut off, preventing it from operating and no longer supplying power to the signal detection module. In other words, power is only supplied to the signal detection module when it needs to operate, thus solving the problem of needing a separate power supply circuit, which results in high cost and high power consumption. Furthermore, because the power supply to the signal detection module is on-demand, rather than continuous, it achieves low-cost, reliable control while reducing the air conditioner's power consumption. Additionally, since the isolated power conversion module circuits are all voltage-to-voltage conversion circuits, compared to circuits that require AC to DC conversion, the circuit voltage is lower, control is simpler, and the cost is further reduced compared to the original circuit, improving the reliability of the air conditioner's operation.

[0006] Therefore, a second objective of this invention is to provide a control method for an air conditioner.

[0007] To achieve the above objectives, a first aspect of the present invention provides an air conditioner, comprising: a main chip control module, the main chip control module including a signal detection port and a power output control port; a power conversion module, the input terminal of the power conversion module being connected to an AC power source, the power conversion module being adapted to convert the AC power provided by the AC power source into a first DC voltage suitable for powering the main chip control module, and outputting it through an output terminal; a signal detection module, the first terminal of the signal detection module being adapted to receive various DRED frequency modulation signals transmitted from the power grid, the second terminal of the signal detection module being adapted to connect to the signal detection port, the signal detection module being adapted to convert different DRED frequency modulation signals into corresponding different voltage signals during operation; and an isolated power supply module, the isolated power supply module including an input terminal, an output terminal, and a control terminal, the input terminal of the isolated power supply module being connected to an AC power source. The output terminal of the power conversion module is connected, the output terminal of the isolated power module is connected to the power supply terminal of the signal detection module, and the control terminal of the isolated power module is connected to the power output control port. The isolated power module is adapted to convert the first DC voltage into a second DC voltage to power the signal detection module and enable it to work. The main chip control module is configured to: send a control signal to the control terminal through the power output control port according to the current state of the air conditioner to control the on / off state of the isolated power module, thereby controlling the power supply state of the isolated power module to the signal detection module, causing the signal detection module to work or not work; when different voltage signals are detected at the signal detection port, control the air conditioner to perform a power adjustment action corresponding to the voltage signal, wherein different voltage signals correspond to different power limits.

[0008] According to an embodiment of the present invention, the air conditioner adopts a low-cost approach by adding only a low-voltage side isolation power supply module and a power output control port to the main chip control module. When signal detection is required, the isolation power supply module is activated to provide isolated power to the signal detection module, enabling it to perform signal detection. After detection is complete, the power supply circuit of the isolation power supply module is shut off, preventing it from operating and no longer supplying power to the signal detection module. In other words, power is only supplied to the signal detection module when it needs to operate, thus solving the problem of needing a separate power supply circuit, which results in high cost and high power consumption. Furthermore, because the power supply to the signal detection module is on-demand rather than continuous, low-cost, reliable control is achieved, while reducing the air conditioner's power consumption. Additionally, since the isolation power conversion module circuits are all voltage-to-voltage conversion circuits, compared to circuits that require AC to DC conversion, the circuit voltage is lower, control is simpler, and the cost is further reduced compared to the original circuit, improving the reliability of the air conditioner's operation.

[0009] In some embodiments, when the main chip control module sends a control signal to the control terminal through the power output control port according to the current state of the air conditioner to control the on / off state of the isolated power module, the main chip control module is configured to: when it is determined that the air conditioner is in standby mode, send a first control signal to the control terminal through the power output control port to indicate shutdown, so as to control the isolated power module not to turn on and the signal detection module not to work; or, when it is determined that the air conditioner is in operation mode, send a second control signal to the control terminal through the power output control port to indicate periodic on and off, so as to control the isolated power module to periodically turn on according to a first preset time, and each on-time lasts for a second preset time, so that the signal detection module turns on and works every first preset time, and turns off and stops working after the second preset time.

[0010] The above technical solution has the following beneficial effects: By setting a power output control port, the isolation power module is periodically turned on and off during air conditioner operation, causing the signal detection module to periodically turn on and off. This ensures that the signal detection module is in a power-free state for most of the air conditioner's operation, only receiving power when needed, further reducing operating power consumption.

[0011] In some embodiments, the second control signal includes a square wave signal with a preset frequency and a preset duty cycle, the square wave signal including a plurality of first bands for indicating a first preset time to be turned off and a plurality of second bands for indicating a second preset time to be turned on.

[0012] The above technical solution has the following beneficial effects: by sending square wave signals with preset frequency and preset duty cycle, instructions can be distinguished by high and low level bands, eliminating the need for complex decoding circuits and reducing hardware costs and program computation load; by starting and stopping the load according to the band, intermittent operation can be achieved, effectively reducing the standby and operating power consumption of the air conditioner.

[0013] In some embodiments, the isolated power supply module includes: a transformer, one end of the primary winding of the transformer being connected to the output terminal of the power conversion module, one end of the secondary winding of the transformer being connected to the power supply terminal of the signal detection module, and the other end of the secondary winding of the transformer being grounded; and a switching transistor, the control terminal of the switching transistor being connected to the power output control port, the first end of the switching transistor being connected to the other end of the primary winding of the transformer, and the second end of the switching transistor being grounded.

[0014] The above technical solution has the following beneficial effects: by using a transformer to provide a stable power supply to the signal detection module on the isolated high-voltage side, electrical isolation is achieved, avoiding high-voltage crosstalk and electric shock risks; the switching transistor can accurately control the isolated conversion power supply module according to the main chip control module, and promptly turn the power on and off, achieving low-cost and reliable control and reducing air conditioner power consumption.

[0015] In some embodiments, the turns ratio of the primary winding to the secondary winding of the transformer is 1:1.

[0016] The above technical solution has the following beneficial effects: by using a transformer to isolate the voltage, the input voltage and output voltage are the same, for example, both are 5V. Therefore, the turns ratio of the primary winding and the secondary winding of the transformer can be 1:1, eliminating the need to design a complex transformer ratio. The matching of winding turns and wire diameter is simpler, which can further save materials and reduce costs.

[0017] In some embodiments, the isolated power supply module further includes: a first capacitor, one end of which is connected to one end of the primary winding of the transformer and the output terminal of the power conversion module, and the other end of the first capacitor is grounded.

[0018] The above technical solution has the following beneficial effects: The first capacitor is placed between the output terminal and the ground terminal of the main chip control module to store and filter the input power supply. When the switching transistor of the switching power supply is turned on and off quickly, it can quickly replenish the current, avoid the voltage drop, and make the power supply more stable.

[0019] In some embodiments, the isolated power supply module further includes a clamping absorption circuit, which is connected in parallel to both ends of the primary winding of the transformer.

[0020] The above technical solution has the following beneficial effects: a clamping absorption circuit consisting of diodes, resistors and capacitors is connected in parallel across the primary winding of the transformer to absorb the high voltage on the control terminal when the switching transistor is turned off, thus preventing damage to the switching transistor.

[0021] In some embodiments, the isolated power supply module further includes: a first diode, the anode of the first diode being connected to one end of the secondary winding of the transformer, and the cathode of the first diode being connected to the power supply terminal of the signal detection module; a second capacitor, one end of the second capacitor being connected to the cathode of the first diode and the power supply terminal of the signal detection module respectively, and the other end of the second capacitor being grounded.

[0022] The above technical solution has the following beneficial effects: the unidirectional conduction performance of the first diode converts the alternating pulses output by the transformer into unidirectional pulsating DC, providing basic DC power supply for subsequent circuits, while charging the second capacitor to store energy; the second capacitor filters and stores energy for the output power supply, providing the stable voltage required by the signal detection module.

[0023] To achieve the above objectives, a second aspect of the present invention provides a control method for an air conditioner, the control method comprising: acquiring the current state of the air conditioner; based on the current state of the air conditioner, sending a control signal to the control terminal of an isolated power supply module through a power output control port to control the on / off state of the isolated power supply module, thereby controlling the power supply state of the isolated power supply module to a signal detection module, causing the signal detection module to operate or not operate; when the signal detection module is operating, if different voltage signals are detected through the signal detection port, controlling the air conditioner to perform a power adjustment action corresponding to the voltage signals, wherein different voltage signals correspond to different power limits, and the signal detection module converts different DRED frequency modulation signals transmitted from the power grid into corresponding different voltage signals when operating.

[0024] According to the air conditioner control method of the present invention, the current state of the air conditioner is obtained through the main chip control module. If the air conditioner is in standby mode, the main chip control module continuously outputs a low-level square wave signal to control the isolation power supply module to remain off, thereby not supplying power to the signal detection module. If the air conditioner is in operation, the power output control port of the main chip control module periodically sends a square wave signal to the control terminal of the isolation power supply module to control the isolation power supply module to periodically turn on and supply power to the signal detection module. Furthermore, when the signal detection module is powered on, when the signal detection port detects a voltage signal, the air conditioner is controlled to perform a power adjustment action corresponding to the voltage signal by detecting different voltage signals through the signal detection port. This solves the problem of needing to provide a separate power supply circuit, resulting in high cost and high power consumption, achieving low-cost and reliable control while reducing the power consumption of the air conditioner.

[0025] In some embodiments, the step of sending a control signal to the control terminal of the isolation power module through the power output control port to control the on / off state of the isolation power module according to the current state of the air conditioner includes: when it is determined that the air conditioner is in standby mode, sending a first control signal to the control terminal through the power output control port to indicate shutdown, so as to control the isolation power module not to turn on and the signal detection module not to work; or, when it is determined that the air conditioner is in operation mode, sending a second control signal to the control terminal through the power output control port to indicate periodic on and off, so as to control the isolation power module to periodically turn on according to a first preset time, and each on-time lasting for a second preset time, so as to cause the signal detection module to turn on and work every first preset time, and then turn off and stop working after the second preset time.

[0026] The above technical solution has the following beneficial effects: By setting a power output control port, the isolation power module is periodically turned on and off during air conditioner operation, causing the signal detection module to periodically turn on and off. This ensures that the signal detection module is in a power-free state for most of the air conditioner's operation, only receiving power when needed, further reducing operating power consumption.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the refrigeration cycle system of an air conditioner according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the main chip control module according to another embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an air conditioner according to another embodiment of the present invention; Figure 5 This is a schematic diagram of the circuit principle of an air conditioner according to an embodiment of the present invention; Figure 6 This is a flowchart of a control method for an air conditioner according to another embodiment of the present invention; Figure 7 This is a flowchart illustrating a control method for an air conditioner according to another embodiment of the present invention. Detailed Implementation

[0029] 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, and 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.

[0030] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] like Figure 1 As shown, in this invention, the air conditioner 1 performs a refrigeration cycle by using a compressor, condenser, evaporator, throttling device, and four-way valve. The refrigeration cycle includes a series of processes involving compression, condensation, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0034] The compressor compresses the refrigerant gas, which is in a high-temperature, high-pressure state and enters through the return pipe, and then discharges the compressed refrigerant gas through the exhaust pipe. The discharged refrigerant gas flows into the condenser through the condenser inlet pipe. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0035] The evaporator evaporates the refrigerant that expands in the throttling device and returns the refrigerant gas, now at a low temperature and low pressure, to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, air conditioner 1 regulates the temperature of the indoor space.

[0036] Combination Figure 2 As shown, the air conditioner 1 in this application includes an indoor unit 11 and an outdoor unit 12, which can be configured as split-type units. The indoor unit 11 can be configured as a wall-mounted unit, a ceiling-mounted unit, a ducted unit, etc., and the indoor unit 11 is installed on the top or ceiling of the indoor room.

[0037] Taking indoor wall-mounted units as an example, indoor wall-mounted units are usually installed on indoor walls or other locations. For example, indoor cabinet units (not shown in the figure) are also a type of indoor unit 11.

[0038] Taking a split-type air conditioner as an example, the air conditioner 1 includes an indoor unit 11 and an outdoor unit 12. The outdoor unit 12 is usually installed outdoors and is used for heat exchange in the indoor environment.

[0039] Furthermore, the air conditioner 1 includes a main chip control module 71 to control the operation of various components within the air conditioner 1, enabling each component to perform its predetermined functions. The air conditioner 1 also includes a control device 200, which, exemplarily, is a remote control. This remote control has the capability to communicate with the main chip control module 71, for example, using infrared or other communication methods. The remote control allows the user to perform various controls on the air conditioner 1, enabling interaction between the user and the air conditioner 1.

[0040] In this embodiment of the application, the indoor unit 11 of the air conditioner 1 is located at the top or upper part of the room. Generally, the installation height of the indoor unit 11 is higher than the user's activity area. The indoor unit 11 includes a return air vent 17 and an air outlet 16 that communicate with the room. Indoor air flows back into the room through the return air vent 17 and the indoor unit 11, and then through the air outlet 16.

[0041] An air guide plate 2 is installed at the air outlet 16. By changing its relative rotation angle with the air outlet 16, the air guide plate 2 adjusts the outflow direction of the air flowing through the air outlet 12, thereby affecting the stratification of indoor air temperature.

[0042] This application embodiment also provides a hardware structure diagram of the main chip control module 71, as shown below. Figure 3 As shown, the main chip control module 71 includes a processor 83, and optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, memory 82, and communication interface 84 are connected via a bus 81.

[0043] Processor 83 can be a central processing unit (CPU), a general-purpose processor (NP), a network processor (NP), a digital signal processor (DSP), a microprocessor (Microcontroller), a programmable logic device (PLD), or any combination thereof. Processor 83 can also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 83 can also include multiple CPUs, and processor 83 can be a single-core processor. CPU) processor 83, or multi-core (multi) CPU) Processor 83. Here, processor 83 may refer to one or more devices, circuits, or processing cores used to process data (such as computer program instructions).

[0044] Memory 82 can be a read-only memory 82 (read ROM (Read-Only Memory) or other types of static storage devices capable of storing static information and instructions; random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions; or electrically erasable programmable read-only memory (EEPROM). EEPROM (Electronic EPROM) and Compact Disc Retrieval System (CD-ROM) are both memory-only systems. Only memory, CD The storage medium can be ROM or other optical disc storage, optical disk storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application embodiment does not impose any limitations on this. The memory 82 can exist independently or be integrated with the processor 83. The memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the control method of the air conditioner 1 provided in this application embodiment.

[0045] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, circuit, transceiver, or any device capable of communication.

[0046] Bus 81 can be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. Bus 81 can be divided into address bus 81, data bus 81, control bus 81, etc.

[0047] The following is combined Figures 4-6 An air conditioner and a control method for the air conditioner are described according to embodiments of the present invention.

[0048] In some embodiments, combined with Figure 4 As shown, the air conditioner 1 includes: a main chip control module 71, a power conversion module 72, a signal detection module 73, and an isolated power supply module 74. The main chip control module 71 includes a signal detection port 75 and a power output control port 76.

[0049] In a specific embodiment, combined with Figure 5 As shown, the main chip control module 71 includes a signal detection port 75 and a power output control port 76.

[0050] In a specific embodiment, combined with Figure 5 As shown, the input terminal of the power conversion module 72 is connected to an AC power source. The power conversion module 72 is adapted to convert the AC power supplied by the AC power source into a first DC voltage suitable for powering the main chip control module 71, and output it through the output terminal.

[0051] Specifically, the AC power supply directly draws household AC power into the circuit via the L and N lines. The AC power passes through a rectifier bridge B1 composed of four diodes. When L is positive and N is negative, current flows through the upper and lower diodes of the bridge rectifier; when L is negative and N is positive, current flows through the other two diodes, alternating the positive and negative AC currents into unidirectional pulsating DC current, allowing the power conversion module 72 connected later to operate stably. The rectified high-voltage DC is then fed into the power conversion module 72. This module internally uses a high-frequency switching power supply topology to chop, step down, and regulate the high-voltage DC, ultimately outputting a stable low-voltage DC, i.e., the first DC voltage, for example... Figure 5 The +5V shown provides a clean and reliable power supply for the subsequent main chip control module 71, signal detection module 73 and other low-voltage loads, ensuring the stable operation of the control circuit.

[0052] In some embodiments, combined with Figure 5 As shown, the first end of the signal detection module 73 is adapted to receive various DRED frequency modulation signals transmitted from the power grid, and the second end of the signal detection module 73 is adapted to connect to the signal detection port 75 of the main chip control module 71. The signal detection module 73 is adapted to convert different DRED frequency modulation signals into corresponding voltage signals when it is working.

[0053] Specifically, the signal detection module 73 is a multi-level smart grid power rationing signal identification circuit based on voltage divider optocoupler isolation. The signal detection port 75 of the main chip control module 71 is connected to +5V via pull-up resistor R3, and this port is also connected to the collectors of optocouplers B1, B2, and B3 of the signal detection module 73. The transmitting side of each optocoupler is connected to the DRED1, DRED2, and DRED3 pins of the smart grid signal detection interface terminal X1 via current-limiting resistors R7, R8, and R9, respectively, suitable for receiving various DRED frequency modulation signals transmitted from the grid. The anodes of the optocouplers are uniformly connected to P-5V provided by the isolation power supply module, while the cathodes are connected to the control side reference ground GND via pull-down resistors R4, R5, and R6 of different values.

[0054] Furthermore, when the grid load is normal and there is no need to limit the air conditioner's power consumption, DRED1, DRED2, and DRED3 of terminal X1 are all open circuits. No current flows through the transmitting side of optocouplers B1, B2, and B3, and the receiving side of the optocouplers remains cut off. At this time, the signal detection port 75 is pulled up to a 5V high level by the pull-up resistor R3. The main chip control module 71 recognizes that no power limiting is required and controls the air conditioner to operate normally under the rated target conditions. When the grid load is too high and power limiting regulation is required, the corresponding DRED signal terminal of X1 is connected to the isolation reference ground D-GND. The corresponding transmitting side of the optocoupler is energized and the receiving side is simultaneously turned on, so that the signal detection port 75 forms a voltage divider circuit through the pull-up resistor R3 and the corresponding pull-down resistor, outputting different levels of voltage. For example, when DRED1 is turned on, R3 and R4 divide the voltage; when DRED2 is turned on, R3 and R5 divide the voltage; when DRED3 is turned on, R3 and R6 divide the voltage. The signal detection module 73 achieves electrical isolation between the power grid side and the control side through an optocoupler. It realizes the identification of multiple power limit signals on a single detection port by means of hardware voltage division, thereby improving the system stability and security, saving the IO resources of the control chip, and making the circuit more reliable, less power-consuming, and more scalable.

[0055] In some embodiments, combined with Figure 5 As shown, the isolated power supply module 74 includes an input terminal, an output terminal, and a control terminal B. The input terminal of the isolated power supply module 74 is connected to the output terminal of the power conversion module 72, and the output terminal of the isolated power supply module 74 is connected to the power supply terminal of the signal detection module 73. The control terminal B of the isolated power supply module 74 is connected to the power output control port 76. The isolated power supply module 74 is adapted to convert the first DC voltage into a second DC voltage to power the signal detection module 73 and enable it to work.

[0056] Specifically, the isolated power supply module 74 receives the 5V voltage output from the power conversion module 72 as its own operating power supply, while its start / stop is controlled by the main chip control module 71. This ensures that the module is not constantly energized, but rather flexibly starts and stops according to actual signal detection needs. Only when the main chip control module 71 determines that signal acquisition and related functional actions are required will the isolated power supply module 74 be triggered to power on and enter the working state, providing a stable power supply to the signal detection module 73. During idle periods without detection needs, the isolated power supply module 74 remains de-energized and does not participate in power output. This allows the isolated power supply module 74 to be turned on when needed and turned off when not needed, fundamentally isolating the unnecessary losses caused by long-term no-load operation of the isolated power supply module 74, reducing the overall standby and static power consumption. Furthermore, the start / stop of the isolated power supply module 74 is centrally scheduled by the main chip control module 71, with flexible control methods adaptable to different operating logics, further ensuring the long-term stable operation of the circuit.

[0057] In some embodiments, the main chip control module 71 is configured to: send a control signal to the control terminal B through the power output control port 76 according to the current state of the air conditioner 1, so as to control the on / off state of the isolation power module 74, and thereby control the power supply state of the isolation power module 74 to the signal detection module 73, so that the signal detection module 73 works or does not work; and the main chip control module 71 is further configured to: when different voltage signals are detected at the signal detection port 75, control the air conditioner 1 to perform a power adjustment action corresponding to the voltage signal, wherein different voltage signals correspond to different power limits.

[0058] Specifically, the main chip control module 71 first determines whether the signal detection function needs to be activated based on the current state of the air conditioner 1. For example, when the air conditioner 1 is in standby mode, power regulation control is not required, so the main chip control module 71 determines that signal detection is unnecessary. It maintains a low-level signal output to the control terminal B through the power output control port 76, disconnecting the path of the isolation power supply module 74 and thus not supplying power to the signal detection module 73, making it inoperable. When the main chip control module 71 outputs a control signal to the control terminal B through the power output control port 76, causing the control terminal B to control the isolation power supply module 74 to conduct, the signal detection module 73 receives power, samples and identifies the input voltage at the signal detection port 75, and uses the identified voltage value as the control basis. Based on the pre-established correspondence between the voltage signal and the power limit, the main chip control module 71 determines the current maximum allowable output power and adjusts the operating state of the air conditioner 1 accordingly. For example: When air conditioner 1 needs to stop operating, DRED1 closes to connect to D-GND, so the transmitter and receiver of optocoupler B1 are turned on. At this time, resistors R3 and R4 form a voltage divider circuit. Ignoring the forward voltage drop of the optocoupler, we can calculate that V≈5V×[R4 / (R3+R4)]≈0.45V. When the signal detection port 75 detects a voltage signal near this range, it sends a control command to stop air conditioner 1. When air conditioner 1 needs to operate at a power not exceeding 50% of its rated standard power, DRED2 closes to connect to D-GND, so the transmitter and receiver of optocoupler B2 are turned on. At this time, resistors R3 and R5 form a voltage divider circuit. Ignoring the forward voltage drop of the optocoupler, we can calculate that V≈5V×[R5 / [(R3+R5)]≈3.33V. When the signal detection port 75 detects a voltage signal near this range, it sends a control command to control the operating power of air conditioner 1 to not exceed 50% of the rated nominal power. When the operating power of air conditioner 1 needs to not exceed 75% of the rated nominal power, DRED3 closes to connect to D-GND, so the transmitting end of optocoupler B3 is turned on and the receiving end is also turned on. At this time, resistors R3 and R6 form a voltage divider circuit. Ignoring the forward voltage drop of the optocoupler, we calculate that V≈5V×[R6 / (R3+R6)]≈4.55V. When the signal detection port 75 detects a voltage signal near this range, it sends a control command to control the operating power of air conditioner 1 to not exceed 75% of the rated nominal power. Therefore, by controlling the on / off state of the isolation power supply module 74 and performing corresponding power limit adjustments according to different voltage signals, the air conditioner 1 can achieve graded power control and on-demand detection. When detection is not required, the power supply to the signal detection module 73 is turned off, thereby reducing standby power consumption and achieving low-cost, reliable control and low-power detection circuit.

[0059] In one embodiment of the present invention, combined with Figure 5As shown, when the main chip control module 71 sends a control signal to the control terminal B through the power output control port 76 to control the on / off state of the isolation power module 74 according to the current state of the air conditioner 1, the main chip control module 71 is configured to: when it is determined that the air conditioner 1 is in standby state, send a first control signal to the control terminal B through the power output control port 76 to indicate that it is off, so as to control the isolation power module 74 not to turn on and the signal detection module 73 not to work; or, when it is determined that the air conditioner 1 is in running state, send a second control signal to the control terminal B through the power output control port 76 to indicate that it is periodically turned on and off, so as to control the isolation power module 74 to periodically turn on according to a first preset time, and each time the turn-on time lasts for a second preset time, so that the signal detection module 73 turns on and works every first preset time, and turns off and stops working after the second preset time.

[0060] Specifically, after the air conditioner 1 is powered on, the main chip control module 71 first determines whether the air conditioner 1 is in standby mode or running mode. If it is in standby mode, the power output control port 76 sends a first control signal to the control terminal B to indicate shutdown. This first control signal may include a low-level square wave signal. The control terminal B continuously receives a low-level signal, resulting in no base current. No current flows through the circuit connecting the power output control port 76 and the isolation power module 74, and the isolation power module 74 circuit remains closed, preventing the signal detection module 73 from receiving power and operating. Therefore, when the air conditioner 1 is powered on but not required to operate, the isolation power module 74 stops supplying power to the signal detection module 73, reducing standby power consumption.

[0061] Furthermore, when the air conditioner 1 is in operation, since the signal sent by the smart grid does not require a real-time instantaneous response, the signal detection module 73 is allowed to respond with a delay. Therefore, when the air conditioner 1 is working, the main chip control module 71 can send a second control signal to the control terminal B through the power output control port 76 to indicate periodic opening and closing. The second control signal may include: a control signal that cycles periodically for a first preset time and each opening lasts for a second preset time. That is, the main chip control module 71 continuously outputs a second control signal that can periodically control the control terminal B to close within the set first preset time period. After the first preset time, when the control terminal B receives the opening command that lasts for the second preset time, it will conduct the C terminal and the E terminal, thereby energizing the isolation power module 74 and providing a stable low-voltage power supply to the signal detection module 73. After the power output control port 76 sends a second control signal to control the isolated power supply module 74 to supply power to the signal detection module 73 for a stable period of time, such as 10 seconds, the signal detection port 75 of the main chip control module 71 starts to work to detect changes in the port signal voltage. If the corresponding voltage signals of DRED1, DRED2, and DRED3 are detected at this time, the operating power of the air conditioner 1 is controlled to be reduced or stopped accordingly. After a second preset time, the power output control port 76 stops sending square wave signals to the control terminal B, and the signal detection port 75 also stops working. Therefore, by periodically turning the isolated power supply module 74 on and off to supply power to the signal detection module 73, so that it stops working during non-detection periods, the ineffective power consumption caused by continuous operation of the module can be effectively avoided, energy waste can be reduced, and the overall energy efficiency of the system can be improved.

[0062] In one embodiment of the present invention, combined with Figure 5 As shown, the second control signal includes a square wave signal with a preset frequency and a preset duty cycle. The square wave signal includes a plurality of first bands for indicating a first preset time to be turned off and a plurality of second bands for indicating a second preset time to be turned on.

[0063] Specifically, the square wave signal comprises two bands within one cycle: the first band indicates the off state, with a duration of a first preset time; the second band indicates the on state, with a duration of a second preset time. The ratio of the first to the second preset time is determined by the duty cycle of the square wave signal, while the entire cycle is determined by a preset frequency. For example, when the frequency is 100kHz and the duty cycle is 30%, meaning the high-level time accounts for 30% of the entire waveform length, the duration for which the isolated power supply module 71 is on accounts for 30% of the total duration. Since the total time from the main chip control module 71 supplying power to the signal detection module 73 from the isolated power supply module 74 to the detection of the signal is typically only a few seconds, the duration for which the main chip control module 71 sends the square wave signal does not need to be too long, usually set to within one minute. In practice, the output duration and duty cycle can be adjusted according to the stability of the output voltage. Thus, the signal detection module 73 is in a state of no power supply for most of the air conditioner's operation, further reducing operating power consumption.

[0064] Furthermore, after the main chip control module 71 sends a square wave signal to control the switching transistor V1, and the transformer T2 supplies power to the signal detection module 73 for a stable period of time (e.g., 10 seconds), the signal detection port 75 of the main chip control module 71 also starts working to detect changes in the port signal voltage. If the voltage signals corresponding to DRED1, DRED2, and DRED3 are detected at this time, the operating power of the air conditioner 1 is reduced or stopped as required. When the main chip control module 71 stops sending square wave signals to the switching transistor V1 and the transformer T2, the signal detection port 75 also stops working. Since the total time from powering the signal detection module 73 to detecting the signal is usually only a few seconds, the duration of the square wave signal sent by the main chip control module 71 does not need to be too long, usually set to within 1 minute. In practice, the output duration and duty cycle can be adjusted according to the stability of the output voltage. In this way, the signal detection module 73 is in a state of not needing power for most of the entire air conditioner operation process. As in the example above, after working for 1 minute, it does not need to work for 3 minutes, further reducing operating power consumption.

[0065] In one embodiment of the present invention, such as Figure 5As shown, the isolated power supply module 74 includes: a transformer T2, one end of the primary winding of the transformer T2 is connected to the output terminal of the power conversion module 72, one end of the secondary winding of the transformer T2 is connected to the power supply terminal of the signal detection module 73, and the other end of the secondary winding of the transformer T2 is grounded; a switching transistor V1, the control terminal B of the switching transistor V1 is connected to the power output control port 76, the first terminal C of the switching transistor V1 is connected to the other end of the primary winding of the transformer, and the second terminal E of the switching transistor B is grounded.

[0066] Specifically, pins 1 and 2 of transformer T2 form the primary winding. Pin 1 is connected to the 5V provided by the power conversion module 72, allowing it to access the operating power supply and provide a power reference. Pin 2 is connected to the first terminal C of the switching transistor V1. By utilizing the switching characteristics of the switching transistor, the periodic on / off control of the transformer T2 circuit is achieved, which, in conjunction with the square wave signal, completes the intermittent start / stop and electrical isolation drive of the controlled module. Pins 3 and 4 of transformer T2 form the secondary output winding. The output of pin 3 is connected to the power supply terminal of the signal detection module 73, serving as the voltage output terminal to supply power to the subsequent load. Pin 4 is connected to the output reference ground D-GND to establish a stable potential reference, forming a complete power supply circuit. At the same time, it suppresses potential fluctuations and interference signals, ensuring the stable and reliable operation of the subsequent circuit.

[0067] Furthermore, the first terminal C of the switching transistor V1 can be connected to pin 2 of the transformer as its collector. The switching transistor V1 is turned on and off by the level signal from the control terminal B, thus controlling the connection of the winding or load circuit. Its second terminal E is connected to GND as its emitter, forming a complete circuit. The control terminal B is connected to the power output control port 76 of the main chip control module 71 through resistor R1. When the switching transistor B receives a low-level signal from the power output control port 76, the switching transistor V1 is turned off, and the connection between C and E is broken. When a high-level signal is received, the switching transistor V1 is turned on, and the connection between C and E is established, allowing current to flow. Resistor R1 acts as a current-limiting pull-up resistor, limiting the base drive current and preventing damage to the switching transistor V1 due to overcurrent, ensuring the stability and reliability of the switching control logic. By isolating the voltage through transformer T2 and controlling the on / off circuit of switching transistor V1, the control of the isolation power supply module 74 is facilitated. It can directly draw power from a single power source, eliminating the need for a separate power supply for isolation. This effectively avoids the ineffective power consumption caused by the continuous operation of the isolation power supply module 74, reduces energy waste, and improves the overall energy efficiency of the system.

[0068] In one embodiment of the present invention, combined with Figure 5 As shown, the turns ratio of the primary winding to the secondary winding of the transformer is 1:1.

[0069] Specifically, pin 1 of transformer T2 is connected to the output voltage, such as 5V, provided by power conversion module 72. This means transformer T2's input voltage is 5V, and it also provides the required 5V voltage to signal detection module 73. Transformer T2 primarily serves an isolation function, so the turns ratio of its primary and secondary windings can be 1:1. For example, 10 turns can be wound between pins 1 and 2, and 10 turns between pins 3 and 4. Thus, the highest output of transformer T2 is 5V, eliminating the need for additional voltage regulation circuitry while achieving electrical isolation, interference filtering, and safe separation of strong and weak currents. This further reduces costs. Furthermore, due to the low current and voltage, the transformer size can be made smaller while maintaining safe distances, saving materials. Simultaneously, since the circuitry of isolation power module 74 is entirely 5V-to-5V, compared to circuits requiring conversion from 220V AC to 5V DC, the lower voltage and simpler control further reduce costs.

[0070] In one embodiment of the present invention, combined with Figure 5 As shown, the isolated power supply module 74 also includes a first capacitor C1, one end of which is connected to one end of the primary winding of the transformer T2 and the output terminal of the power conversion module 72, and the other end of which is grounded.

[0071] Specifically, capacitor C1 is connected in parallel with transformer T2 at the output port of power conversion module 72 to receive the output 5V voltage for energy storage and filtering. When the power supply voltage drops briefly, capacitor C1 can quickly release the stored charge to supplement the power supply to transformer T2, suppress the voltage drop, and maintain the voltage stability of the primary winding of transformer T2. At the same time, the other end of capacitor C1 is grounded, thereby absorbing spike interference and improving the circuit's anti-interference capability and power supply stability.

[0072] In one embodiment of the present invention, the isolation power supply module 74 further includes a clamping absorption circuit, which is connected in parallel to both ends of the primary winding of the transformer T2.

[0073] Specifically, its clamping absorption circuit includes: diode V2, resistor R2, and capacitor C2. One end of diode V2 is connected to the collector (C) of the switching transistor V1 and pin 2 of transformer T2, and the other end is connected to resistor R2 and capacitor C2. Diode V2 enables unidirectional current conduction, guiding the peak voltage to the absorption capacitor C2. One end of resistor R2 is connected to the output of diode V2 and capacitor C2, and the other end is connected to the output of power conversion module 72 and pin 1 of transformer T2. Capacitor C2 is connected in parallel with resistor R2. One end of capacitor C2 is connected to capacitor R2 and diode V2, and the other end is connected to pin 1 of transformer T2 and the output of power conversion module 72. Capacitor C2 is used to absorb peak energy, temporarily storing the energy of the peak voltage, thereby suppressing the overvoltage spike across the switching transistor V1 and preventing the switching transistor V1 from breaking down.

[0074] Furthermore, when the power output control port 76 controls the isolation power supply module 74 to power on, the primary winding of transformer T2 generates a reverse induced electromotive force due to the inductance effect, causing the potential at pin 2 of the winding to momentarily exceed 5V. At this time, diode V2 conducts in the forward direction, guiding the voltage spike to the absorption capacitor C2, thereby suppressing the overvoltage spike across the switching transistor V1 and preventing breakdown. When the switching transistor V1 is conducting and the circuit is operating normally, the potential at the first terminal C of the switching transistor V1 is higher than the potential at pin 2 of transformer T2. Diode V2 is subjected to reverse voltage and cut off, blocking the path of normal operating current into the absorption circuit and preventing energy loss. At the same time, resistor R2 is connected in parallel with capacitor C2, which can slowly dissipate the spike energy stored in capacitor C2, preventing the continuous accumulation of energy that would lead to circuit heating and efficiency degradation. This circuit, through the unidirectional guidance of diode V2 and the charging and discharging of resistor R2 and capacitor C2 in parallel, effectively suppresses the voltage spike on the primary side of transformer T2, improving the reliability and operational stability of the control switching power supply.

[0075] In one embodiment of the present invention, such as Figure 5 As shown, the isolated power supply module further includes: a first diode V3, the anode of which is connected to one end of the secondary winding of the transformer, and the cathode of which is connected to the power supply terminal of the signal detection module 73; and a second capacitor C3, one end of which is connected to both the cathode of the first diode V3 and the power supply terminal of the signal detection module 73, and the other end of which is grounded.

[0076] Specifically, the first diode V3 is connected in series in the secondary winding circuit of transformer T2 to form a secondary rectifier circuit. The secondary output of the transformer is an alternating AC voltage. Utilizing the unidirectional conduction characteristic of the diode, the first diode V3 only allows the AC voltage to be transmitted to the subsequent circuit during the positive half-cycle, realizing the rectification and conversion of AC to unidirectional pulsating DC. At the same time, during the negative half-cycle of the voltage and when the potential of the downstream energy storage capacitor is higher than the potential of the secondary winding, the first diode V3 is reverse-biased and cut off, which can effectively prevent the charge at the output terminal of transformer T2 from flowing back to the secondary winding of transformer T2, reducing circuit losses and electromagnetic interference.

[0077] Furthermore, one end of the second capacitor C3 is connected to the cathode of the first diode V3 and the power supply terminal of the signal detection module 73, while the other end is grounded. The second capacitor C3 is connected in parallel between the output terminal of the first diode V3 and ground. Utilizing the charging and discharging characteristics of the capacitor, it can smooth and filter the pulsating DC voltage after rectification by the first diode V3, suppressing voltage ripple and high-frequency interference. At the same time, it has an energy storage function, releasing charge when the load current changes abruptly, maintaining a stable output voltage, and providing a low-ripple, high-stability DC power supply for the signal detection module 73.

[0078] According to an embodiment of the present invention, the air conditioner 1, by adopting a low-cost approach, only adds a low-voltage side isolation power supply module 74 and adds a power output control port 76 to the main chip control module 71. When signal detection is required, the isolation power supply module 74 is turned on to provide isolated power to the signal detection module, enabling it to operate for signal detection. After detection is completed, the power supply circuit of the isolation power supply module 74 is turned off, so that it no longer operates and no longer supplies power to the signal detection module 73. That is, power is only supplied to the signal detection module 73 when it needs to operate, thereby solving the problem of needing a separate power supply circuit, which results in high cost and high power consumption. At the same time, because the power supply to the signal detection module 73 is on demand, rather than continuously and uninterruptedly, the goal of low-cost and reliable control can be achieved, while reducing the power consumption of the air conditioner. Furthermore, since the circuit of the isolation power supply module 74 consists of circuits that convert between the same voltage, compared with circuits that need to convert from AC to DC, the circuit voltage is lower, the control is simpler, and the cost is further reduced compared to the original circuit, improving the reliability of the air conditioner 1.

[0079] The following is for reference. Figure 6 The present invention describes a control method for an air conditioner according to an embodiment of the present invention, wherein the air conditioner includes: a power conversion module, a signal detection module, an isolation power module, and a main chip control module, and the control method for the air conditioner includes at least steps S1-S3.

[0080] Step S1: Obtain the current status of the air conditioner.

[0081] Step S2: Based on the current state of the air conditioner, send a control signal to the control terminal of the isolation power module through the power output control port to control the on / off state of the isolation power module, thereby controlling the power supply state of the isolation power module to the signal detection module, so that the signal detection module works or does not work.

[0082] Step S3: When the signal detection module is working, if different voltage signals are detected through the signal detection port, the air conditioner is controlled to perform power adjustment actions corresponding to the voltage signals. Different voltage signals correspond to different power limits. When the signal detection module is working, it converts different DRED frequency modulation signals transmitted from the power grid into corresponding voltage signals.

[0083] In some embodiments, combined with Figure 7 As shown, based on the current state of the air conditioner, a control signal is sent to the control terminal through the power output control port to indicate the on / off state of the isolation power module. This includes: when it is determined that the air conditioner is in standby mode, a first control signal for indicating shutdown is sent to the control terminal through the power output control port to control the isolation power module not to turn on, so that the signal detection module does not work; or, when it is determined that the air conditioner is in operation mode, a second control signal for indicating periodic on and off is sent to the control terminal through the power output control port to control the isolation power module to periodically turn on according to a first preset time, and each on-time lasts for a second preset time, so that the signal detection module turns on and works every first preset time, and turns off and stops working after the second preset time.

[0084] Specifically, after the air conditioner is powered on, the main chip control module first determines whether the air conditioner is in standby or running mode. If it is in standby mode, the power output control port sends a first control signal to the control terminal to indicate shutdown. This first control signal may include a low-level square wave signal. The control terminal continuously receives a low-level signal, resulting in no base current. No current flows through the circuit connecting the power output control port and the isolation power module, and the isolation power module circuit remains closed, preventing the signal detection module from receiving power and operating. Therefore, when the air conditioner is powered on but not required to operate, the isolation power module stops supplying power to the signal detection module, reducing standby power consumption.

[0085] Furthermore, when the air conditioner is in operation, since the signals sent by the smart grid do not require a real-time instantaneous response, the signal detection module is allowed to respond with a delay. Therefore, when the air conditioner is working, the main chip control module can send a second control signal to the control terminal through the power output control port to indicate periodic on / off operation. The second control signal may include: a control signal that cycles periodically for a first preset time, and each on / off operation lasts for a second preset time. That is, within the set first preset time period, the main chip control module continuously outputs a second control signal that can periodically control the control terminal to turn off. After the first preset time, when the control terminal receives the on / off command that lasts for the second preset time, it will conduct the power supply to the isolation power module, thereby providing a stable low-voltage power supply to the signal detection module. After the power output control port sends the second control signal to control the isolation power module to supply power to the signal detection module for a stable period of time, such as 10 seconds, the signal detection port of the main chip control module will start working to detect changes in the port signal voltage. If the corresponding voltage signals of DRED1, DRED2, and DRED3 are detected at this time, the air conditioner's operating power will be reduced or the unit will be stopped as required. After a second preset time, the power output control port stops sending square wave signals to the control terminal, and the signal detection port also stops working. Therefore, by periodically turning the isolation power module on and off to power the signal detection module, causing it to stop working during non-detection periods, the unnecessary power consumption caused by continuous module operation can be effectively avoided, reducing energy waste and improving the overall energy efficiency of the system.

[0086] In some embodiments, the second control signal includes a square wave signal with a preset frequency and a preset duty cycle, wherein the square wave signal includes a plurality of first bands for indicating a first preset time to be turned off and a plurality of second bands for indicating a second preset time to be turned on.

[0087] It should be noted that when controlling the air conditioner, the specific implementation of the control method of the air conditioner is similar to the specific implementation of the air conditioner in any of the above embodiments of the present invention. Therefore, for a detailed exemplary description of the control method of the air conditioner, please refer to the aforementioned description of the air conditioner. To reduce redundancy, it will not be repeated here.

[0088] According to the air conditioner control method of the present invention, the current state of the air conditioner is obtained through the main chip control module. If the air conditioner is in standby mode, the main chip control module continuously outputs a low-level square wave signal to control the isolation power supply module to remain off, thereby not supplying power to the signal detection module. If the air conditioner is in operation mode, the power output control port of the main chip control module periodically sends a square wave signal to the control terminal of the isolation power supply module to control the isolation power supply module to periodically turn on and supply power to the signal detection module. Furthermore, when a voltage signal is detected at the signal detection port, the air conditioner is controlled to perform a power adjustment action corresponding to the voltage signal by detecting different voltage signals through the signal detection port. This solves the problem of needing to provide a separate power supply circuit, resulting in high cost and high power consumption, achieving low-cost and reliable control while reducing the power consumption of the air conditioner.

[0089] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0090] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner characterized by comprising: include: The main chip control module includes a signal detection port and a power output control port. A power conversion module, wherein the input terminal of the power conversion module is connected to an AC power source, and the power conversion module is adapted to convert the AC power provided by the AC power source into a first DC voltage suitable for powering the main chip control module, and output it through the output terminal; A signal detection module, wherein a first end of the signal detection module is adapted to receive various DRED frequency modulation signals transmitted from the power grid, a second end of the signal detection module is adapted to connect to the signal detection port, and the signal detection module is adapted to convert different DRED frequency modulation signals into corresponding different voltage signals during operation; An isolated power supply module includes an input terminal, an output terminal, and a control terminal. The input terminal of the isolated power supply module is connected to the output terminal of the power conversion module, the output terminal of the isolated power supply module is connected to the power supply terminal of the signal detection module, and the control terminal of the isolated power supply module is connected to the power output control port. The isolated power supply module is adapted to convert the first DC voltage into a second DC voltage to power the signal detection module and enable it to work. The main chip control module is configured as follows: Based on the current state of the air conditioner, a control signal is sent to the control terminal through the power output control port to control the on / off state of the isolation power module, thereby controlling the power supply state of the isolation power module to the signal detection module, so that the signal detection module works or does not work. When different voltage signals are detected at the signal detection port, the air conditioner is controlled to perform a power adjustment action corresponding to the voltage signal, wherein different voltage signals correspond to different power limits.

2. The air conditioner according to claim 1, characterized in that, When the main chip control module sends a control signal to the control terminal through the power output control port according to the current state of the air conditioner to control the on / off state of the isolated power supply module, the main chip control module is configured as follows: When it is determined that the air conditioner is in standby mode, a first control signal indicating shutdown is sent to the control terminal through the power output control port to control the isolation power module to not turn on, thereby disabling the signal detection module; or... When it is determined that the air conditioner is in operation, a second control signal is sent to the control terminal through the power output control port to indicate periodic on and off, so as to control the isolation power module to turn on periodically according to a first preset time, and each on-time lasts for a second preset time, so that the signal detection module turns on and works every first preset time, and turns off after the second preset time.

3. The air conditioner according to claim 2, characterized in that, The second control signal includes a square wave signal with a preset frequency and a preset duty cycle. The square wave signal includes multiple first bands for indicating a first preset time to be turned off and multiple second bands for indicating a second preset time to be turned on.

4. The air conditioner according to claim 1, characterized in that, The isolated power supply module includes: A transformer, wherein one end of the primary winding of the transformer is connected to the output terminal of the power conversion module, one end of the secondary winding of the transformer is connected to the power supply terminal of the signal detection module, and the other end of the secondary winding of the transformer is grounded. A switching transistor, the control terminal of which is connected to the power output control port, the first end of which is connected to the other end of the primary winding of the transformer, and the second end of which is grounded.

5. The air conditioner according to claim 4, characterized in that, The turns ratio of the primary winding to the secondary winding of the transformer is 1:

1.

6. The air conditioner according to claim 4, characterized in that, The isolated power supply module also includes: The first capacitor has one end connected to one end of the primary winding of the transformer and the output terminal of the power conversion module, and the other end of the first capacitor is grounded.

7. The air conditioner according to claim 4, characterized in that, The isolated power supply module also includes: A clamping absorption circuit is connected in parallel to both ends of the primary winding of the transformer.

8. The air conditioner according to claim 4, characterized in that, The isolated power supply module also includes: The first diode has its anode connected to one end of the secondary winding of the transformer, and its cathode connected to the power supply terminal of the signal detection module. The second capacitor has one end connected to the cathode of the first diode and the power supply terminal of the signal detection module, and the other end grounded.

9. A control method for an air conditioner, characterized in that, For an air conditioner as described in any one of claims 1-8, the control method includes: Obtain the current status of the air conditioner; Based on the current state of the air conditioner, a control signal is sent to the control terminal of the isolation power module through the power output control port to control the on / off state of the isolation power module, thereby controlling the power supply state of the isolation power module to the signal detection module, so that the signal detection module works or does not work. When the signal detection module is working, if different voltage signals are detected through the signal detection port, the air conditioner is controlled to perform a power adjustment action corresponding to the voltage signal. Different voltage signals correspond to different power limits. When the signal detection module is working, it converts different DRED frequency modulation signals transmitted from the power grid into different voltage signals.

10. The control method for an air conditioner according to claim 9, characterized in that, The step of sending a control signal to the control terminal of the isolation power module through the power output control port according to the current state of the air conditioner to control the on / off state of the isolation power module includes: When it is determined that the air conditioner is in standby mode, a first control signal indicating shutdown is sent to the control terminal through the power output control port to control the isolation power module to not turn on, thereby disabling the signal detection module; or... When it is determined that the air conditioner is in operation, a second control signal is sent to the control terminal through the power output control port to indicate periodic on and off, so as to control the isolation power module to turn on periodically according to a first preset time, and each on-time lasts for a second preset time, so that the signal detection module turns on and works every first preset time, and turns off after the second preset time.

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