Switching power supply control circuit, method and air conditioner device capable of realizing frequency switching

Abstract

The present invention discloses a switching power supply control circuit, method and air-conditioning equipment capable of realizing frequency switching. Among them, the circuit includes: a power supply chip, an execution unit and an MCU; the MCU, with its input end connected to the equipment and its output end connected to the execution unit, is used to detect the working state of the equipment and send a control signal to the execution unit according to the working state of the equipment, so as to control the working frequency of the switching power supply; the execution unit is used to control the conduction relationship inside the power supply chip to realize different working frequencies of the switching power supply; the power supply chip is connected to the positive pole of the switching power supply. Through the present invention, it is possible to control the switching power supply to work at a lower frequency in the standby state of the equipment, reduce power consumption, and enable the equipment to achieve low-power standby.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic power, and in particular, to a switching power supply control circuit, method, and air conditioner device capable of realizing frequency switching. Background Art

[0002] With the wide application and popularization of electrical equipment, the public's requirements for electrical equipment have not only remained at the application effect, but also gradually considered the power consumption problem of electrical equipment.

[0003] However, there are power consumption problems during both the standby and normal operation stages of current electrical equipment. When designing a switching power supply, switching losses are inevitably generated. During the operation of the equipment, the switching power supply adjusts the balance of the backend output through a feedback loop. Currently, air conditioner controllers on the market generally use a fixed-frequency switch. It is impossible to adjust the switching frequency according to the load, and only the duty cycle can be adjusted. A fixed-frequency switch will generate relatively large losses during the standby process of the equipment.

[0004] In view of the problem of relatively large power consumption still existing during the standby process of equipment due to the fixed switching frequency in the prior art, no effective solution has been proposed yet. Summary of the Invention

[0005] An embodiment of the present invention provides a switching power supply control circuit, method, and air conditioner device capable of realizing frequency switching to solve the problem of relatively large power consumption still existing during the standby process of equipment due to the fixed switching frequency in the prior art.

[0006] To solve the above technical problem, the present invention provides a switching power supply control circuit capable of realizing frequency switching, wherein the circuit includes: a power supply chip, an execution unit, and an MCU;

[0007] The MCU has an input end connected to the device and an output end connected to the execution unit, and is configured to detect the working state of the device and send a control signal to the execution unit according to the working state of the device, thereby controlling the working frequency of the switching power supply;

[0008] The execution unit is configured to realize different conduction relationships with the power supply chip to realize different working frequencies of the switching power supply;

[0009] The power supply chip is connected to the positive electrode of the switching power supply.

[0010] Further, the power supply chip includes a frequency pin, a control pin, and a source pin;

[0011] The conduction relationships include: the frequency pin is conducted with the source pin, or the frequency pin is conducted with the control pin.

[0012] Further, when the frequency pin is conducting with the source pin, the operating frequency of the switching power supply is the first frequency;

[0013] When the frequency pin is conducting with the control pin, the operating frequency of the switching power supply is the second frequency;

[0014] The second frequency is greater than the first frequency.

[0015] Further, the MCU includes:

[0016] A first control unit, configured to control the frequency pin to conduct with the source pin when the device is in the standby state, thereby controlling the switching power supply to operate at the first frequency;

[0017] A second control unit, configured to control the frequency pin to conduct with the control pin when the device is in the normal operation state, thereby controlling the switching power supply to operate at the second frequency.

[0018] Further, the circuit further includes:

[0019] A feedback circuit, whose input terminal is connected to the MCU, and the output terminal is respectively connected to the positive electrode of the switching power supply and the control pin of the switching power supply chip, for controlling the input voltage of the load to remain stable.

[0020] Further, the feedback circuit includes:

[0021] An optocoupler, the first end and the second end of the input side are connected to the MCU, the first end of the output side is connected to the power voltage input terminal of the power supply chip, and the second end is connected to the control pin of the power supply chip.

[0022] Further, the circuit further includes:

[0023] A voltage conversion module, one end is connected to the positive electrode of the switching power supply, and the other end is connected to the MCU, for reducing the voltage output by the switching power supply and then outputting it to the MCU.

[0024] Further, the voltage conversion module is a transformer.

[0025] The present invention also provides an air conditioning device, including the above-mentioned switching power supply control circuit.

[0026] The present invention also provides a switching power supply control method capable of realizing frequency switching, which is applied to the above-mentioned switching power supply control circuit capable of realizing frequency switching. Wherein, the method includes:

[0027] Monitoring the operating state of the device, where the operating state includes: standby state and normal operation state;

[0028] Control the operating frequency of the switching power supply according to the operating state of the device.

[0029] Further, controlling the operating frequency of the switching power supply according to the operating state of the device includes:

[0030] If the device is in the standby state, control the switching power supply to operate at the first frequency;

[0031] If the device is in the normal operating state, control the switching power supply to operate at the second frequency;

[0032] Wherein, the second frequency is greater than the first frequency.

[0033] Further, controlling the switching power supply to operate at the first frequency includes: controlling the frequency pin and the source pin of the power chip to conduct;

[0034] Controlling the switching power supply to operate at the second frequency includes: controlling the frequency pin and the control pin of the power chip to conduct.

[0035] Further, the execution unit is an internal dual-control switch, which is respectively connected to the power chip and the MCU.

[0036] The present invention also provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the above method is implemented.

[0037] Applying the technical solution of the present invention, by detecting the working state of the device and controlling the frequency switching of the execution unit according to the working state of the device, when the device is in the standby state, control the execution unit to work at a lower frequency to reduce power consumption and enable the device to achieve low-power standby. Description of the Drawings

[0038] Figure 1 Structural diagram of a switching power supply control circuit according to an embodiment of the present invention;

[0039] Figure 2 Structural diagram of a switching power supply control circuit according to another embodiment of the present invention;

[0040] Figure 3 Structural diagram of a switching power supply control circuit according to still another embodiment of the present invention;

[0041] Figure 4 Specific structural diagram of a switching power supply control circuit according to an embodiment of the present invention;

[0042] Figure 5 Flowchart of a switching power supply control method according to an embodiment of the present invention. Detailed Embodiment

[0043] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0044] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. "Plural" generally includes at least two.

[0045] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0046] It should be understood that although the terms first, second, etc. may be used in the embodiments of the present invention to describe different frequencies, these frequencies should not be limited to these terms. These terms are only used to distinguish different frequencies. For example, without departing from the scope of the embodiments of the present invention, the first frequency can also be called the second frequency, and similarly, the second frequency can also be called the first frequency.

[0047] Depending on the context, the words "if", "when" as used herein can be interpreted as "when...", "when...", "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined", "in response to determining", "when detecting (stated condition or event)", or "in response to detecting (stated condition or event)".

[0048] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such commodity or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or device including the said element.

[0049] The optional embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0050] Embodiment 1

[0051] This embodiment provides a switching power supply control circuit capable of realizing frequency switching. Figure 1 As shown in the structural diagram of the switching power supply control circuit according to the embodiment of the present invention, Figure 1 as shown, the circuit includes: a power supply chip 11, an execution unit 12, and an MCU 13. The input end of the MCU 13 is connected to the device, and the output end is connected to the execution unit 12, which is used to detect the working state of the device and send a control signal to the execution unit 12 according to the working state of the device, so as to control the working frequency of the switching power supply; the execution unit 12 can be an internal dual-control switch, and different conduction relationships with the power supply chip 11 correspond to different working frequencies.

[0052] In specific implementation, detecting the working state of the device is realized by detecting the current, voltage, or power of the load 14 in the device. Since the current, voltage, or power of the load is different in the standby state and the normal working state of the device, generally speaking, in the standby state of the device, the current, voltage, and power of the load are much lower than those in the normal working state of the device. Therefore, the MCU 13 can judge whether the device is in the standby state or the normal working state by detecting the current, voltage, or power of the load 14. Specifically, which method is used to realize the judgment of the device working state can be selected by those skilled in the art according to actual needs, and the present invention does not make specific limitations. In addition, the number of loads here can be one or multiple. After the judgment of the device working state is completed, the MCU 13 sends different control signals to the execution unit 12 according to different judgment results to control the conduction relationship inside the execution unit 12, and further control the conduction relationship inside the power supply chip 11. Since different conduction relationships correspond to different working frequencies of the execution unit, it is possible to realize controlling the working frequency of the switching power supply according to the working state of the device. The MCU 13 is also used to supply power to the execution unit 12.

[0053] It should be noted that the device is preferably an air-conditioning device, and can also be any other electrical device that needs to be controlled by a power supply chip, such as a water heater, a dehumidifier, a humidifier, a centrifuge, etc., and the present invention does not make specific limitations.

[0054] The switching power supply control circuit capable of realizing frequency switching in this embodiment controls the frequency switching of the switching power supply by detecting the working state of the device. In the standby state of the device, the switching power supply is controlled to work at a lower frequency to reduce power consumption and enable the device to achieve low-power standby.

[0055] Embodiment 2

[0056] This embodiment provides another switching power supply control circuit capable of realizing frequency switching. Figure 2 FIG. Figure 2 is a structural diagram of a switching power supply control circuit according to another embodiment of the present invention. In order to further realize the switching conduction relationship between the power supply chip 11 and the execution unit 12 according to the working state of the device, this embodiment is further improved on the basis of Embodiment 1. As shown in Figure 2 FIG. Figure 2 , the power supply chip includes a frequency pin F, a control pin C, and a source pin S; the frequency pin F is connected to the first pin 1 of the execution unit 12, the control pin C is connected to the second pin 2 of the execution unit 12, and the source pin S is connected to the third pin 3 of the execution unit 12. The conduction relationship specifically includes: the third pin 3 inside the execution unit 12 is conducted with the first pin 1, thereby realizing the conduction between the frequency pin F and the source pin S, or the first pin 1 inside the execution unit 12 is conducted with the second pin 2, thereby realizing the conduction between the frequency pin F and the control pin C. The power supply chip is connected to the positive pole of the switching power supply.

[0057] In this embodiment, it is necessary to realize that the working frequency of the execution unit needs to be switched according to different working states of the device. Therefore, when the frequency pin F is conducted with the source pin S, the working frequency of the switching power supply is the first frequency; when the frequency pin F is conducted with the control pin C, the working frequency of the switching power supply is the second frequency; wherein, the second frequency is greater than the first frequency, that is to say, when the frequency pin F is conducted with the source pin S, the switching power supply works at a lower frequency, and when the frequency pin F is conducted with the control pin C, the switching power supply works at a higher frequency.

[0058] In this embodiment, in order to control the conduction state of the power supply chip 11 and the execution unit 12, as shown in Figure 2 FIG. Figure 2 , the MCU 13 includes: a first control unit 131, configured to send a first control signal to the control interface IO of the execution unit 12 when the device is in the standby state, control the conduction between the frequency pin F and the source pin S, and thereby control the switching power supply to work at the first frequency, that is, to control the switching power supply to work at a lower frequency, reduce power loss, and at the same time avoid frequent disconnection and conduction of the switching power supply, reducing the loss of components; the MCU 13 further includes a second control unit 132, configured to send a second control signal to the control interface IO of the execution unit 12 when the device is in the normal operation state, control the conduction between the frequency pin F and the control pin C, and thereby control the switching power supply to work at the second frequency, that is, to realize the switching power supply to work at a higher frequency to meet the high-efficiency output requirement of the high-frequency band of the switching power supply.

[0059] In order to control the output of the switching power supply according to the device voltage fed back by the MCU and realize stable voltage output, as shown inFigure 2 As shown, the circuit further includes: a feedback circuit 15, whose input terminal is connected to the MCU, and whose output terminal is respectively connected to the positive electrode of the switching power supply and the control pin C of the switching power supply chip 11, and is used to control the input voltage of the load to remain stable. Specifically, the feedback circuit 15 may include: an optocoupler. Those skilled in the art should know that the optocoupler includes an input side and an output side, and both the input side and the output side each include two connection terminals, respectively forming a conduction loop to achieve isolation between strong and weak electricity. In this embodiment, the first end and the second end of the input side of the optocoupler are respectively connected to two of the pins of the MCU 13 to receive the voltage of the load fed back by the MCU, the first end of the output side is connected to the positive electrode of the switching power supply, and the second end is connected to the control pin C of the power supply chip 11.

[0060] In specific implementation, since the MCU 13 is essentially a control chip and the operating voltage of the chip is generally low, in order to convert the relatively high voltage provided by the power supply into a relatively low voltage and output it to the MCU 13, the circuit further includes: a voltage conversion module 16. One end of the voltage conversion module 16 is connected to the power supply, and the other end is connected to the MCU 13, and is used to reduce the voltage output by the switching power supply and then output it to the MCU 13. Specifically, the voltage conversion module is a transformer. The first end of the primary coil of the transformer is connected to the positive electrode of the switching power supply, the second end is connected to the first end of the output side of the optocoupler, and the two ends of the secondary coil are connected to two of the pins of the MCU 13. Through this transformer, it is possible to convert the relatively high voltage provided by the power supply into a relatively low voltage and output it to the MCU 13.

[0061] In specific implementation, in order to input a voltage signal to the execution unit 12 and realize the power supply to the execution unit 12, the MCU 13 is respectively connected to the VCC pin and the GND pin of the execution unit 12.

[0062] It should be noted that in order to highlight the key points of the present invention, therefore, only the scheme for controlling the frequency switching of the switching power supply is introduced in detail in the above embodiments. Those skilled in the art should understand that the power supply to the load through the switching power supply also needs to be combined with other corresponding circuits to implement, and this part of the circuit is well-known technology in the art, so it will not be elaborated here.

[0063] Embodiment 3

[0064] Next, taking the application scenario of an air conditioner as an example, another optional embodiment of the present invention will be described in detail. Figure 3 It is a structural diagram of a switching power supply control circuit according to another embodiment of the present invention, as Figure 3As shown in the figure, the switching power supply control circuit of this embodiment includes a switching power supply chip 311 (i.e., the power supply chip 11 in the above embodiment), a built-in double-control switch 312 (i.e., the execution unit 12 in the above embodiment), a main control chip 313 (i.e., the MCU 13 in the above embodiment), a load 314 of the air-conditioning equipment (i.e., the load 14 in the above embodiment), a feedback module 315 (i.e., the feedback circuit 15 in the above embodiment), and a transformer 316 (i.e., the voltage conversion module 16 in the above embodiment). The input end of the main control chip 313 is connected to the load 314 of the air-conditioning equipment, and the output end is connected to the built-in double-control switch 312, which is used to obtain the load operation state of the air-conditioning equipment and send different control signals to the built-in double-control switch 312 according to the working state of the load 314 of the air-conditioning equipment, so as to control the conduction relationship inside the built-in double-control switch 312, and further control the conduction relationship inside the switching power supply chip 311. Specifically, the conduction relationship includes: the frequency pin F of the switching power supply chip 311 is conducted with the source pin S, or the frequency pin F of the switching power supply chip 311 is conducted with the control pin C. When the frequency pin F of the switching power supply chip 311 is conducted with the source pin S, the switching power supply works at a lower frequency (for example, 66KHZ). When the frequency pin F of the switching power supply chip 311 is conducted with the control pin C, the switching power supply works at a higher frequency (for example, 132HZ). According to the formula period t = 1 / frequency f, the larger the frequency f of the execution unit of the switching power supply, the shorter the period t, that is, the more times the execution unit is conducted and turned off within the same time, which will lead to greater power loss of the air conditioner. However, when the air conditioner is in the standby state, it is not necessary for the switching power supply to be conducted and turned off frequently. Therefore, when the air conditioner is in the standby state, the working frequency of the switching power supply can be appropriately reduced to reduce power consumption and avoid the loss of the switching power supply itself.

[0065] Figure 4 FIG. is a specific structural diagram of the switching power supply control circuit according to an embodiment of the present invention. As Figure 4 shown, in an embodiment of the present invention, the feedback module 315 is an optocoupler. The two connection ends on the input side of the optocoupler are respectively connected to two pins of the main control chip 313. The first connection end on the output side is connected to the neutral line L of the switching power supply through a capacitor C and a rectifier 317 in sequence. The second end on the output side is connected to the control pin of the switching power supply chip 311, which is used to output a stable voltage signal according to the load voltage of the air conditioner fed back by the main control chip 313.

[0066] As Figure 4 shown, in an embodiment of the present invention, the frequency pin F, the control pin C, and the source pins S1 - S6 of the switching power supply chip 311 are respectively connected to the first pin 31, the second pin 32, and the third pin 33 of the built-in double-control switch 312.

[0067] In one embodiment of the present invention, two ends of the primary coil of the transformer 316 are respectively connected to the capacitor C and the first end of the output side of the feedback module 315, and two segments of the secondary coil are respectively connected to two pins of the main control chip 313.

[0068] In one embodiment of the present invention, in order to input a control signal to the built-in dual-control switch 312 to control the built-in dual-control switch 312, the main control chip 313 supplies power to the built-in dual-control switch 312 through the VCC pin and the GND pin of the built-in dual-control switch 312 respectively, and sends a control signal to the built-in dual-control switch 312 through the IO pin.

[0069] The control scheme of the existing switching power supply is to realize the on and off states of the execution unit by adjusting the duty cycle of the switch. According to different load requirements, the duty cycle will be continuously adjusted, that is, the switching power supply is constantly turned on and off, so as to store energy for the rear-end winding T to realize the power supply to the load 314. Based on this control scheme, when the air-conditioning system is in the standby state, the fixed-frequency switch still turns on and off frequently, generating unnecessary energy consumption.

[0070] The control principle of this embodiment includes: when the air-conditioning system is powered on, the main control chip 313 detects that the air conditioner is in the standby state at this time. According to its internal logic, the main control chip 313 controls the conduction relationship inside the electronic execution unit, and then controls the frequency pin F of the switching power supply chip 311 to conduct with the source pin S. At this time, the switching power supply works at a lower frequency, such as 66KHZ. The working frequency of the switching power supply is lower than that when the air conditioner is running normally, thus reducing the switching power supply loss;

[0071] When the air-conditioning system receives an external instruction to start up, the main control chip 313 controls the air conditioner to execute the load output command;

[0072] After the air conditioner executes the load output command and the load starts to run, the main control chip 313 detects that the air-conditioning load power increases, and then changes the conduction relationship inside the built-in dual-control switch 312 to realize the connection between the frequency pin F and the control pin C of the switching power supply chip 311. The switching power supply runs at a higher frequency, such as 132KHZ, so as to meet the high-efficiency output in the high-frequency band of the switching power supply;

[0073] When the air conditioner enters the standby state again, the main control chip 313 controls the switching power supply to work at a lower frequency again.

[0074] According to the external instruction information, the main control chip 314 controls the built-in dual-control switch 312 to execute corresponding actions, so that the switching power supply works in the most effective frequency band, achieving the purpose of low power consumption in the standby state.

[0075] The switching power supply control circuit of this embodiment realizes the low-power control of the air conditioner by reducing the frequency of the execution unit in the standby state through the main control chip 313, the built-in dual-control switch 312, and the switching power supply chip 311. In addition, when the air conditioner receives a load output instruction, the main control chip 314 controls the load to perform corresponding actions, the load power increases, and then the current or voltage increases. The feedback module receives the current or voltage change of the load, and the feedback module 315 controls the output of the switching power supply to stabilize the voltage to the load according to the current or voltage change of the load, meeting the efficient output in the high-frequency band of the switching power supply. Through the solution of this embodiment, it is possible to avoid serious power consumption loss in the standby state of the air conditioner, save electric energy, and thus enhance the competitiveness of the air conditioner in the market.

[0076] Embodiment 4

[0077] This embodiment provides an air-conditioning device, including the above-mentioned switching power supply control circuit capable of realizing frequency switching.

[0078] Embodiment 5

[0079] This embodiment provides a switching power supply control method capable of realizing frequency switching, which is applied to the above-mentioned switching power supply control circuit capable of realizing frequency switching. Figure 5 As the flowchart of the switching power supply control method according to the embodiment of the present invention, as Figure 5 shown, the method includes:

[0080] S501, monitor the operating state of the device, where the operating state includes: standby state and normal operating state. Since the current, voltage, or power of the load in the device is different in the standby state and the normal working state of the device. Generally speaking, in the standby state of the device, the current, voltage, and power of the load in the device are much lower than those in the normal working state of the device. Therefore, it is possible to judge whether the device is in the standby state or the normal working state by detecting the current, voltage, or power of the load, etc. Specifically, how to realize the judgment of the device working state can be selected by those skilled in the art according to actual needs, and the present invention does not make specific limitations;

[0081] S502, control the working frequency of the switching power supply according to the operating state of the device. In order to further realize switching the working frequency of the switching power supply according to the working state of the device, S502 specifically includes: if the device is in the standby state, control the switching power supply to work at the first frequency; if the device is in the normal operating state, control the switching power supply to work at the second frequency; where the second frequency is greater than the first frequency. Specifically, controlling the switching power supply to work at the first frequency includes: controlling the frequency pin of the power supply chip to conduct with the source pin; controlling the switching power supply to work at the second frequency includes: controlling the frequency pin of the power supply chip to conduct with the control pin.

[0082] In this embodiment, in order to achieve the switching of the conduction states of the power chip and the execution unit, the execution unit is an internally built dual-control switch, which is respectively connected to the power chip and the MCU.

[0083] Embodiment 6

[0084] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the above method is implemented.

[0085] The circuit embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0086] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solutions or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. A switching power supply control circuit, characterized in that, the circuit comprises: a power chip, an execution unit, and an MCU; the MCU, with its input end connected to the device and its output end connected to the execution unit, is used to detect the working state of the device and send a control signal to the execution unit according to the working state of the device, thereby controlling the working frequency of the switching power supply; the execution unit is used to control the conduction relationship inside the power chip to achieve different working frequencies of the switching power supply; the power chip is connected to the positive pole of the switching power supply; the power chip includes a frequency pin, a control pin, and a source pin; the conduction relationship includes: the frequency pin is conducted with the source pin, or the frequency pin is conducted with the control pin; when the frequency pin is conducted with the source pin, the working frequency of the switching power supply is the first frequency; when the frequency pin is conducted with the control pin, the working frequency of the switching power supply is the second frequency; the second frequency is greater than the first frequency.

2. The circuit according to claim 1, characterized in that, the MCU comprises: a first control unit, which is used to control the conduction between the frequency pin and the source pin when the device is in the standby state, thereby controlling the switching power supply to work at the first frequency; a second control unit, which is used to control the conduction between the frequency pin and the control pin when the device is in the normal operation state, thereby controlling the switching power supply to work at the second frequency.

3. The circuit according to claim 1, characterized in that, the circuit further comprises: a feedback circuit, with its input end connected to the MCU and its output end respectively connected to the positive pole of the switching power supply and the control pin of the switching power supply chip, is used to control the input voltage of the load to remain stable.

4. The circuit according to claim 3, characterized in that, the feedback circuit comprises: an optocoupler, with the first end and the second end of the input side connected to the MCU, the first end of the output side connected to the positive pole of the switching power supply, and the second end connected to the control pin of the power chip.

5. The circuit according to claim 1, characterized in that, the circuit further comprises: a voltage conversion module, with one end connected to the positive pole of the switching power supply and the other end connected to the MCU, is used to reduce the voltage output by the switching power supply and then output it to the MCU.

6. The circuit according to claim 5, characterized in that, the voltage conversion module is a transformer.

7. An air conditioner device, characterized in that, it comprises the switching power supply control circuit according to any one of claims 1-6.

8. A switching power supply control method, applied to the switching power supply control circuit according to any one of claims 1-6, characterized in that, the method comprises: monitoring the operation state of the device, where the operation state includes: standby state and normal operation state; controlling the working frequency of the switching power supply according to the operation state of the device.

9. The method according to claim 8, characterized in that, controlling the working frequency of the switching power supply according to the operation state of the device includes: If the device is in the standby state, control the switching power supply to operate at the first frequency; this includes: controlling the frequency pin of the power supply chip to conduct with the source pin; If the device is in the normal operation state, control the switching power supply to operate at the second frequency; this includes: controlling the frequency pin of the power supply chip to conduct with the control pin; Wherein, the second frequency is greater than the first frequency.

10. The method according to claim 9, characterized in that, The execution unit is an internal dual-control switch, which is respectively connected to the power supply chip and the MCU.

11. A computer-readable storage medium, on which a computer program is stored, characterized in that, When the program is executed by a processor, the method described in any one of claims 8 to 10 is implemented.

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