Refrigerator power supply system capable of supporting intelligent switching of multiple power supplies and low in standby power consumption

Abstract

The utility model relates to a refrigerator power supply system supporting intelligent switching of multiple power supplies and having low standby power consumption, comprising a power supply module which is composed of a first power supply, a second power supply and a power adapter and can adapt to various power supply scenes; the voltage detection module is connected with the first power supply, the second power supply and the power adapter and is used for monitoring the voltage of each power supply in real time; the controller is used for receiving, analyzing and processing the detected voltage information and generating a control instruction; the power supply control module establishes a working power supply for the controller on one hand, is connected with a light touch key on the other hand, and is triggered to enter a low-power-consumption standby mode by pressing the key, so that the standby power consumption is effectively reduced; and the power supply power switching circuit is used for accurately and selectively switching the first power supply, the second power supply or the power supply adapter to input power to the refrigerator load according to an instruction of the controller. According to the portable refrigerator power supply management system, a plurality of power supplies can be automatically switched to supply power, the stability and the reliability are high, and the power consumption is low.

Description

Technical Field

[0001] This utility model belongs to the field of portable refrigerator power management system supply technology, specifically relating to a refrigerator power system that supports intelligent switching of multiple power sources and has low standby power consumption. Background Technology

[0002] Portable refrigerators are refrigeration devices that are easy to carry and relatively small in size. They are widely used in many fields such as outdoor activities, home backup, healthcare, and commercial delivery. With the continuous advancement of technology, their performance, functions, and portability are also constantly improving, bringing more convenience to people's lives and work.

[0003] However, most portable refrigerators on the market currently only support a single power mode, such as only being able to input power through a power adapter, or only being able to use specific specifications such as 24V or 36V lithium batteries. Although some products support multiple power input modes, in actual use, only one power source can be used at a time, making it impossible to connect multiple power sources simultaneously. This means that when the battery being used runs out, users must stop the refrigerator and manually switch the power source, which is cumbersome and time-consuming. Moreover, this method of stopping and switching the power source can also negatively affect the refrigerator's cooling effect, because restarting the compressor after each shutdown consumes a lot of energy, increasing energy waste and causing fluctuations in the internal temperature of the refrigerator.

[0004] Furthermore, when existing portable refrigerators are connected to a lithium battery for standby, a DC-DC step-down module needs to be connected between the positive and negative terminals of the lithium battery to meet the voltage requirements of the circuit. This results in a standby power consumption of up to about 0.3W. For the lithium batteries used in portable refrigerators, which have limited power reserves, this is undoubtedly a serious waste of energy, greatly shortens the effective usage time of the lithium battery, and reduces the overall battery life of the portable refrigerator.

[0005] Therefore, this utility model provides a refrigerator power system that supports intelligent switching between multiple power sources and has low standby power consumption to solve the above-mentioned technical problems. Utility Model Content

[0006] To address the aforementioned problems, the purpose of this utility model is to provide a refrigerator power supply system that supports intelligent switching between multiple power sources and has low standby power consumption. This system enables automatic switching between multiple power sources and has low standby power consumption.

[0007] This utility model provides a refrigerator power supply system that supports intelligent switching between multiple power sources and has low standby power consumption, including:

[0008] The power supply module includes a first power supply, a second power supply, and a power adapter;

[0009] A voltage detection module, which is connected to the first power supply, the second power supply and the power adapter simultaneously, is used to detect the voltage of the first power supply, the second power supply and the power adapter in real time;

[0010] The controller, connected to the voltage detection module, is used to receive voltage information from the first power supply, the second power supply, and the power adapter, and to analyze and process the voltage information to generate corresponding control commands.

[0011] A power supply control module, which is connected to the first power supply, the second power supply, the power adapter and the controller, is used to establish the working power supply of the controller;

[0012] A light touch button, which is connected to the power supply control module, is used to trigger the power supply control module to enter a low-power standby mode by pressing, so as to reduce standby power consumption.

[0013] The power switching circuit is connected to the first power supply, the second power supply, the power adapter, the controller, and the power supply control module, and is used to selectively switch the power input from the first power supply, the second power supply, and the power adapter to the load according to the control command issued by the controller.

[0014] Preferably, the voltage detection module includes a first detection circuit connected to both the first power supply and the controller, a second detection circuit connected to both the second power supply and the controller, and a third detection circuit connected to both the power adapter and the controller.

[0015] Preferably, the first detection circuit includes resistors R3 and R6 and capacitor C1. The first terminal of resistor R3 is connected to the positive terminal of the first power supply. The second terminal of resistor R3 is connected to the first terminal of resistor R6, the first terminal of capacitor C1, and the controller. The second terminal of resistor R6 is connected to the second terminal of capacitor C1 and then grounded. The second detection circuit includes resistors R9 and R12 and capacitor C2. The first terminal of resistor R9 is connected to the positive terminal of the second power supply. The second terminal of resistor R9 is connected to the first terminal of resistor R12, the first terminal of capacitor C1, and the controller. The first terminal of resistor R12 is connected to the controller, and the second terminal of resistor R12 is connected to the second terminal of capacitor C2 and then grounded. The third detection circuit includes resistor R15, resistor R18 and capacitor C4. The first terminal of resistor R15 is connected to the positive terminal of the power adapter. The second terminal of resistor R15 is connected to the first terminal of resistor R18, the first terminal of capacitor C4 and the controller. The second terminal of resistor R18 is connected to the second terminal of capacitor C4 and then grounded. The negative terminals of the first power supply, the second power supply and the power adapter are grounded.

[0016] Preferably, the power supply control module includes a first control circuit connected to the positive terminal of the first power supply, the controller, and the power switching circuit; a second control circuit connected to the positive terminal of the second power supply, the controller, and the power switching circuit; and a third control circuit connected to the positive terminal of the power adapter, the controller, and the power switching circuit, wherein the first control circuit, the second control circuit, and the third control circuit are interconnected.

[0017] Preferably, the first control circuit includes transistor Q1, diode D1, resistor R1, resistor R2, transistor Q2, resistor R4, and resistor R5; the second control circuit includes transistor Q3, diode D2, resistor R7, resistor R8, transistor Q4, resistor R10, and resistor R11; the third control circuit includes transistor Q5, diode D3, resistor R13, resistor R14, transistor Q6, resistor R16, and resistor R17; the source of transistor Q1 is simultaneously connected to the positive terminal of the first power supply, the first terminal of resistor R1, and the power switching circuit, and the gate of transistor Q1 is simultaneously connected to the... The first end of resistor R2 is connected to the second end of resistor R1. The drain of transistor Q1 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is simultaneously connected to the source of transistor Q3, the positive terminal of the second power supply, the first end of resistor R7, the negative terminal of diode D2, the source of transistor Q5, the positive terminal of the power adapter, the first end of resistor R13, and the negative terminal of diode D3, and then connected to the power switching circuit. The second end of resistor R2 is simultaneously connected to the collector of transistor Q2, the first end of resistor R8, the collector of transistor Q4, and the... The first terminal of resistor R14, the collector of transistor Q6, and the first terminal of the tactile button are connected together. The second terminal of the tactile button is grounded. The emitter of transistor Q2 is connected to the first terminal of resistor R5 and then grounded. The second terminal of resistor R5 is simultaneously connected to the base of transistor Q2 and the first terminal of resistor R4. The second terminal of resistor R4 is connected to the controller. The gate of transistor Q3 is simultaneously connected to the second terminals of resistor R7 and resistor R8. The drain of transistor Q3 is connected to the positive terminal of diode D2. The emitter of transistor Q4 is connected to the first terminal of resistor R11. The transistors are connected to the ground after the terminals are connected. The second terminal of resistor R11 is connected to both the base of transistor Q4 and the first terminal of resistor R10. The second terminal of resistor R10 is connected to the controller. The gate of transistor Q5 is connected to both the second terminal of resistor R14 and the second terminal of resistor R13. The drain of transistor Q5 is connected to the positive terminal of diode D3. The emitter of transistor Q6 is connected to the first terminal of resistor R17 and then grounded. The second terminal of resistor R17 is connected to both the base of transistor Q6 and the first terminal of resistor R16. The second terminal of resistor R16 is connected to the controller.

[0018] Preferably, the power switching circuit includes a first relay K1, a second relay K2, a third relay K3, an electrolytic capacitor E1, and a DC-DC power module. The first terminal of the first relay K1 is simultaneously connected to the source of the transistor Q5, the positive terminal of the power adapter, and the first terminal of the resistor R13. The second terminal of the first relay K1 is connected to the first terminal of the second relay K2. The third terminal of the first relay K1 is connected to the first terminal of the third relay K3. The second terminal of the second relay K2 is simultaneously connected to the positive terminal of the electrolytic capacitor E1 and the negative terminal of the diode D1. The negative terminals of diodes D2 and D3 are connected to the first terminal of the DC-DC power supply module. The second terminal of the third relay K3 is simultaneously connected to the source of transistor Q1, the positive terminal of the first power supply, and the first terminal of resistor R1. The third terminal of the third relay K3 is simultaneously connected to the source of transistor Q3, the positive terminal of the second power supply, and the first terminal of resistor R7. The negative terminal of electrolytic capacitor E1 is connected to the second terminal of the DC-DC power supply module and then grounded. The third and fourth terminals of the DC-DC power supply module are connected to the controller.

[0019] Preferably, the first power source is a lithium battery with a rated voltage of 36V; the second power source is a lithium battery with a rated voltage of 24V; and the power adapter has a rated voltage of 18V.

[0020] Compared with related technologies, the refrigerator power system provided by this utility model, which supports intelligent switching between multiple power sources and has low standby power consumption, has the following beneficial effects: 1. It can simultaneously connect to multiple power sources such as power adapters, 24V lithium batteries, and 36V lithium batteries. When one power source is insufficient, it automatically and quickly switches to other available power sources based on real-time voltage detection. This high level of intelligence ensures the compressor does not stop during the switching process, maintaining a stable low-temperature environment for refrigerated items and greatly improving ease of use and reliability. 2. By adding touch buttons, the overall power consumption is reduced, extending battery life. 3. Stable and reliable switching between three power inputs is achieved, reducing the risk of equipment failure caused by improper power switching and ensuring long-term stable operation of the refrigerator. 4. The portable refrigerator power management system has a simple circuit structure, reducing reliance on complex and expensive electronic components, effectively controlling production costs while achieving high performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the circuit structure of a refrigerator power supply system that supports intelligent switching between multiple power sources and has low standby power consumption, according to this utility model. Detailed Implementation

[0022] This invention provides a refrigerator power system that supports intelligent switching between multiple power sources and has low standby power consumption, aiming to solve the problem of insufficient power supply and power consumption management in existing portable refrigeration equipment.

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see the appendix Figure 1 As shown, this utility model provides a refrigerator power supply system that supports intelligent switching between multiple power sources and has low standby power consumption, including:

[0025] The power supply module 1 includes a first power supply 11, a second power supply 12, and a power adapter 13;

[0026] Voltage detection module 2 is connected to the first power supply 11, the second power supply 12 and the power adapter 13 simultaneously, and is used to detect the voltage of the first power supply 11, the second power supply 12 and the power adapter 13 in real time.

[0027] The controller 3 is connected to the voltage detection module 2 and is used to receive voltage information from the first power supply 11, the second power supply 12 and the power adapter 13, and to analyze and process the voltage information to generate corresponding control commands.

[0028] The power supply control module 4 is connected to the first power supply 11, the second power supply terminal 12, the power adapter 13 and the controller 3, and is used to establish the working power supply of the controller 3.

[0029] Touch button 5, which is connected to the power supply control module 4, is used to trigger the power supply control module 4 to enter a low-power standby mode by pressing it, so as to reduce standby power consumption.

[0030] The power switching circuit 6 is connected to the first power supply 11, the second power supply 12, the power adapter 13, the controller 3, and the power supply control module 4. It is used to selectively switch the power input from the first power supply 11, the second power supply 12, and the power adapter 13 to the load according to the control command issued by the controller 3.

[0031] In the above structure, the power supply module 1 provides diversified power supply configurations to meet the power needs of different scenarios. Whether connected via a power adapter when mains power is available outdoors or powered by a lithium battery while on the move, the refrigerator can ensure continuous and stable operation. The voltage detection module 2 can detect the voltage of each power source in real time and accurately, providing crucial data support for subsequent intelligent power switching. The controller 3 (MCU) receives voltage information from the voltage detection module 2 and uses its built-in intelligent algorithm to quickly analyze and process this information, generating corresponding control commands to manage core operations such as power switching and device operation status adjustment. The power supply control module 4 not only establishes a reliable power supply for the controller 3, ensuring its normal operation, but also, through connection with the touch button 5, allows the user to trigger the power supply control module 4 into a low-power standby mode by pressing the touch button 5, reducing the overall standby power consumption to below 0.1mW, significantly saving electricity. By tapping button 5, the standby mode can be quickly switched to meet the user's power consumption control needs during different usage periods. Through the power switching circuit, based on precise control commands from the controller, the power input to the refrigerator load (mainly the compressor and other core refrigeration components) can be selectively switched within milliseconds via the first power source 11, the second power source 12, or the power adapter 13, ensuring that the refrigerator's refrigeration operation remains unaffected and a stable temperature environment is maintained under any power status change.

[0032] In this embodiment, the first power source is a lithium battery with a rated voltage of 36V; the second power source is a lithium battery with a rated voltage of 24V; and the power adapter has a rated voltage of 18V. Of course, this is not a limitation; the models and quantities of the first power source, the second power source, and the power adapter can be adjusted according to actual circumstances.

[0033] Specifically, the voltage detection module 2 includes a first detection circuit 21 connected to the first power supply 11 and the controller 3, a second detection circuit 22 connected to the second power supply 12 and the controller 3, and a third detection circuit 23 connected to the power adapter 13 and the controller 3.

[0034] Furthermore, the first detection circuit 21 includes resistors R3 and R6 and capacitor C1. The first end of resistor R3 is connected to the positive terminal of the first power supply 11. The second end of resistor R3 is connected to the first end of resistor R6, the first end of capacitor C1, and the controller 3. The second end of resistor R6 is connected to the second end of capacitor C1 and then grounded. The second detection circuit 22 includes resistors R9 and R12 and capacitor C2. The first end of resistor R9 is connected to the positive terminal of the second power supply 12. The second end of resistor R9 is connected to the first end of resistor R12 and capacitor C2. The first terminal of the resistor R12 is connected to the controller 3, and the second terminal of the resistor R12 is connected to the second terminal of the capacitor C2 and then grounded. The third detection circuit 23 includes a resistor R15, a resistor R18 and a capacitor C4. The first terminal of the resistor R15 is connected to the positive terminal of the power adapter 13. The second terminal of the resistor R15 is connected to the first terminal of the resistor R18, the first terminal of the capacitor C4 and the controller 3. The second terminal of the resistor R18 is connected to the second terminal of the capacitor C4 and then grounded. The negative terminals of the first power supply 11, the second power supply 12 and the power adapter 13 are grounded.

[0035] In this embodiment, the power supply control module 4 includes a first control circuit 41 connected to the positive terminal of the first power supply 11, the controller 3 and the power switching circuit 6, a second control circuit 42 connected to the positive terminal of the second power supply 12, the controller 3 and the power switching circuit 6, and a third control circuit 43 connected to the positive terminal of the power adapter 13, the controller 3 and the power switching circuit 6, and the first control circuit 41, the second control circuit 42 and the third control circuit 43 are interconnected.

[0036] Furthermore, the first control circuit 41 includes transistor Q1, diode D1, resistor R1, resistor R2, transistor Q2, resistor R4, and resistor R5; the second control circuit 42 includes transistor Q3, diode D2, resistor R7, resistor R8, transistor Q4, resistor R10, and resistor R11; the third control circuit 43 includes transistor Q5, diode D3, resistor R13, resistor R14, transistor Q6, resistor R16, and resistor R17; the source of transistor Q1 is simultaneously connected to the positive terminal of the first power supply 11, the first terminal of resistor R1, and the power switching circuit 6, and the gate of transistor Q1... Simultaneously connected to the first terminal of resistor R2 and the second terminal of resistor R1, the drain of transistor Q1 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is simultaneously connected to the source of transistor Q3, the positive terminal of the second power supply 12, the first terminal of resistor R7, the negative terminal of diode D2, the source of transistor Q5, the positive terminal of power adapter 13, the first terminal of resistor R13, and the negative terminal of diode D3, and then connected to the power switching circuit 6. The second terminal of resistor R2 is simultaneously connected to the collector of transistor Q2, the first terminal of resistor R8, and the collector of transistor Q4. The collector of transistor Q2, the first terminal of resistor R14, the collector of transistor Q6, and the first terminal of tactile button 5 are connected. The second terminal of tactile button 5 is grounded. The emitter of transistor Q2 is connected to the first terminal of resistor R5 and then grounded. The second terminal of resistor R5 is simultaneously connected to the base of transistor Q2 and the first terminal of resistor R4. The second terminal of resistor R4 is connected to controller 3. The gate of transistor Q3 is simultaneously connected to the second terminals of resistor R7 and resistor R8. The drain of transistor Q3 is connected to the positive terminal of diode D2. The emitter of transistor Q4 is connected to resistor R11. The first end of resistor R11 is connected to ground. The second end of resistor R11 is connected to both the base of transistor Q4 and the first end of resistor R10. The second end of resistor R10 is connected to controller 3. The gate of transistor Q5 is connected to both the second end of resistor R14 and the second end of resistor R13. The drain of transistor Q5 is connected to the positive terminal of diode D3. The emitter of transistor Q6 is connected to the first end of resistor R17 and then grounded. The second end of resistor R17 is connected to both the base of transistor Q6 and the first end of resistor R16. The second end of resistor R16 is connected to controller 3.

[0037] In this embodiment, the power switching circuit 6 includes a first relay K1, a second relay K2, a third relay K3, an electrolytic capacitor E1, and a DC-DC power module 61. The first terminal of the first relay K1 is simultaneously connected to the source of the transistor Q5, the positive terminal of the power adapter 13, and the first terminal of the resistor R13. The second terminal of the first relay K1 is connected to the first terminal of the second relay K2. The third terminal of the first relay K1 is connected to the first terminal of the third relay K3. The second terminal of the second relay K2 is simultaneously connected to the positive terminal of the electrolytic capacitor E1 and the negative terminal of the diode D1. The negative terminals of diode D2 and D3 are connected to the first terminal of the DC-DC power module 61. The second terminal of the third relay K3 is simultaneously connected to the source of transistor Q1, the positive terminal of the first power supply 11, and the first terminal of resistor R1. The third terminal of the third relay K3 is simultaneously connected to the source of transistor Q3, the positive terminal of the second power supply 12, and the first terminal of resistor R7. The negative terminal of electrolytic capacitor E1 is connected to the second terminal of the DC-DC power module 61 and then grounded. The third and fourth terminals of the DC-DC power module 61 are connected to the controller 3.

[0038] To further illustrate this utility model, the specific working principle of the above structure is as follows:

[0039] 1. In the initial state, when any one of the first power supply 11, the second power supply 12 and the power adapter 13 is connected, since the positive terminals of the three input power supplies are connected to the normally open terminals of the first relay K1, the second relay K2 and the third relay K3 and the sources of transistors Q1, Q3 and Q5, there is no voltage difference between the source and gate of transistors Q1, Q3 and Q5. The entire power control system is in an inactive state, the standby power is close to 0, and the waste power loss is minimized.

[0040] 2. When the user presses the touch button 5, at the moment the button closes, the lower potential of resistors R2, R8 and R14 is pulled to the ground terminal GND. The voltage difference across resistors R1, R7 and R13 turns on transistors Q1, Q3 and Q5 respectively. The current flows in a specific direction and begins to charge the electrolytic capacitor E1, accumulating energy for the subsequent circuit startup.

[0041] 3. As the electrolytic capacitor E1 charges, the VCC power supply is gradually established. The controller 3 obtains the working voltage and starts working. It immediately executes the power-on command and detects the voltage of the three power input ports. Once a voltage is detected at a port, it is determined that the power supply at that port has been connected. Since the operation time of the light touch button is short, the energy of the electrolytic capacitor E1 is relatively small at this time and is not enough to support the control of the relay on its own. At this time, the controller 3 quickly controls the transistors Q2, Q4 and Q6 to conduct. With the amplification effect of the transistors, a stable DC power supply is established to prepare for subsequent high-power power supply.

[0042] 4. Once the DC power supply is established stably, to meet the high power demand of the refrigerator during operation, the current flows in a specific direction. Controller 3 precisely controls the on / off state of relays K1-K3 to select the power source. For example, when selecting an 18V power adapter, controller 3 issues a command to deactivate relays K1 and K3 while activating relay K2, thus connecting the 18V power supply to the circuit. When selecting a 36V lithium battery, controller activates relays K1 and K2 while deactivating relay K3, thus providing 36V lithium battery power. When selecting a 24V lithium battery, relays K1, K2, and K3 activate simultaneously, completing the 24V battery power supply link.

[0043] It should be noted that the principle of non-stop power switching during refrigerator operation is as follows: For example, when two power sources are connected simultaneously, and one of the working power sources is unplugged, the controller 3, relying on the real-time feedback from the voltage detection module 2, detects the voltage change immediately and then prepares to control the switching relay. At this time, due to the energy storage function of the electrolytic capacitor E1, sufficient energy can be provided to the relay in a short time to ensure that the relay can successfully complete the switching action, the compressor does not stop, the cooling effect remains stable, and many drawbacks caused by stopping and restarting are avoided.

[0044] Compared with related technologies, the refrigerator power system provided by this utility model, which supports intelligent switching between multiple power sources and has low standby power consumption, has the following beneficial effects: 1. It can simultaneously connect to multiple power sources such as power adapters, 24V lithium batteries, and 36V lithium batteries. When one power source is insufficient, it automatically and quickly switches to other available power sources based on real-time voltage detection. This high level of intelligence ensures the compressor does not stop during the switching process, maintaining a stable low-temperature environment for refrigerated items and greatly improving ease of use and reliability. 2. By adding touch buttons, the overall power consumption is reduced, extending battery life. 3. Stable and reliable switching between three power inputs is achieved, reducing the risk of equipment failure caused by improper power switching and ensuring long-term stable operation of the refrigerator. 4. The portable refrigerator power management system has a simple circuit structure, reducing reliance on complex and expensive electronic components, effectively controlling production costs while achieving high performance.

[0045] The above-described embodiments should be understood as illustrative, not as limiting the scope of protection of this utility model, which is defined by the claims. For those skilled in the art, non-essential improvements and adjustments made to this utility model without departing from its essence and scope still fall within the scope of protection of this utility model.

Claims

1. A refrigerator power supply system that supports intelligent switching between multiple power sources and has low standby power consumption, characterized in that, The refrigerator power system includes: The power supply module includes a first power supply, a second power supply, and a power adapter; A voltage detection module, which is connected to the first power supply, the second power supply and the power adapter simultaneously, is used to detect the voltage of the first power supply, the second power supply and the power adapter in real time; The controller, connected to the voltage detection module, is used to receive voltage information from the first power supply, the second power supply, and the power adapter, and to analyze and process the voltage information to generate corresponding control commands. A power supply control module, which is connected to the first power supply, the second power supply, the power adapter and the controller, is used to establish the working power supply of the controller; A light touch button, which is connected to the power supply control module, is used to trigger the power supply control module to enter a low-power standby mode by pressing, so as to reduce standby power consumption. The power switching circuit is connected to the first power supply, the second power supply, the power adapter, the controller, and the power supply control module, and is used to selectively switch the power input from the first power supply, the second power supply, and the power adapter to the load according to the control command issued by the controller.

2. A refrigerator power supply system supporting intelligent switching of multiple power sources and low standby power consumption according to claim 1, characterized in that, The voltage detection module includes a first detection circuit connected to both the first power supply and the controller, a second detection circuit connected to both the second power supply and the controller, and a third detection circuit connected to both the power adapter and the controller.

3. A refrigerator power supply system supporting intelligent switching of multiple power sources and low standby power consumption according to claim 2, characterized in that, The first detection circuit includes resistors R3 and R6, and capacitor C1. The first terminal of resistor R3 is connected to the positive terminal of the first power supply. The second terminal of resistor R3 is connected to the first terminal of resistor R6, the first terminal of capacitor C1, and the controller. The second terminal of resistor R6 is connected to the second terminal of capacitor C1 and then grounded. The second detection circuit includes resistors R9 and R12, and capacitor C2. The first terminal of resistor R9 is connected to the positive terminal of the second power supply. The second terminal of resistor R9 is connected to the first terminal of resistor R12 and the second terminal of capacitor C2. The first terminal is connected to the controller, and the second terminal of the resistor R12 is connected to the second terminal of the capacitor C2 and then grounded; the third detection circuit includes a resistor R15, a resistor R18 and a capacitor C4, the first terminal of the resistor R15 is connected to the positive terminal of the power adapter, the second terminal of the resistor R15 is connected to the first terminal of the resistor R18, the first terminal of the capacitor C4 and the controller, the second terminal of the resistor R18 is connected to the second terminal of the capacitor C4 and then grounded, and the negative terminals of the first power supply, the second power supply and the power adapter are grounded.

4. A refrigerator power supply system supporting intelligent switching of multiple power sources and low standby power consumption according to claim 3, characterized in that, The power supply control module includes a first control circuit connected to the positive terminal of the first power supply, the controller, and the power switching circuit; a second control circuit connected to the positive terminal of the second power supply, the controller, and the power switching circuit; and a third control circuit connected to the positive terminal of the power adapter, the controller, and the power switching circuit. The first control circuit, the second control circuit, and the third control circuit are interconnected.

5. A refrigerator power supply system supporting intelligent switching of multiple power sources and low standby power consumption according to claim 4, characterized in that, The first control circuit includes transistor Q1, diode D1, resistor R1, resistor R2, transistor Q2, resistor R4, and resistor R5; the second control circuit includes transistor Q3, diode D2, resistor R7, resistor R8, transistor Q4, resistor R10, and resistor R11; the third control circuit includes transistor Q5, diode D3, resistor R13, resistor R14, transistor Q6, resistor R16, and resistor R17; the source of transistor Q1 is simultaneously connected to the positive terminal of the first power supply, the first terminal of resistor R1, and the power switching circuit, and the gate of transistor Q1 is simultaneously connected to resistor R1. The first terminal of resistor 2 is connected to the second terminal of resistor R1. The drain of transistor Q1 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is simultaneously connected to the source of transistor Q3, the positive terminal of the second power supply, the first terminal of resistor R7, the negative terminal of diode D2, the source of transistor Q5, the positive terminal of the power adapter, the first terminal of resistor R13, and the negative terminal of diode D3, and then connected to the power switching circuit. The second terminal of resistor R2 is simultaneously connected to the collector of transistor Q2, the first terminal of resistor R8, the collector of transistor Q4, and the power adapter. The first terminal of resistor R14, the collector of transistor Q6, and the first terminal of the tactile button are connected. The second terminal of the tactile button is grounded. The emitter of transistor Q2 is connected to the first terminal of resistor R5 and then grounded. The second terminal of resistor R5 is simultaneously connected to the base of transistor Q2 and the first terminal of resistor R4. The second terminal of resistor R4 is connected to the controller. The gate of transistor Q3 is simultaneously connected to the second terminals of resistor R7 and resistor R8. The drain of transistor Q3 is connected to the positive terminal of diode D2. The emitter of transistor Q4 is connected to the first terminal of resistor R11. After being connected to ground, the second end of resistor R11 is simultaneously connected to the base of transistor Q4 and the first end of resistor R10, and the second end of resistor R10 is connected to the controller; the gate of transistor Q5 is simultaneously connected to the second end of resistor R14 and the second end of resistor R13, the drain of transistor Q5 is connected to the positive terminal of diode D3, the emitter of transistor Q6 is connected to the first end of resistor R17 and then grounded, the second end of resistor R17 is simultaneously connected to the base of transistor Q6 and the first end of resistor R16, and the second end of resistor R16 is connected to the controller.

6. A refrigerator power supply system supporting intelligent switching of multiple power sources and low standby power consumption according to claim 5, characterized in that, The power switching circuit includes a first relay K1, a second relay K2, a third relay K3, an electrolytic capacitor E1, and a DC-DC power module. The first terminal of the first relay K1 is connected to the source of transistor Q5, the positive terminal of the power adapter, and the first terminal of resistor R13. The second terminal of the first relay K1 is connected to the first terminal of the second relay K2. The third terminal of the first relay K1 is connected to the first terminal of the third relay K3. The second terminal of the second relay K2 is connected to the positive terminal of the electrolytic capacitor E1 and the negative terminal of diode D1. The negative terminals of diode D2 and D3 are connected to the first terminal of the DC-DC power supply module. The second terminal of the third relay K3 is simultaneously connected to the source of transistor Q1, the positive terminal of the first power supply, and the first terminal of resistor R1. The third terminal of the third relay K3 is simultaneously connected to the source of transistor Q3, the positive terminal of the second power supply, and the first terminal of resistor R7. The negative terminal of electrolytic capacitor E1 is connected to the second terminal of the DC-DC power supply module and then grounded. The third and fourth terminals of the DC-DC power supply module are connected to the controller.

7. A refrigerator power supply system supporting intelligent switching of multiple power sources and low standby power consumption according to claim 6, characterized in that, The first power source is a lithium battery with a rated voltage of 36V; the second power source is a lithium battery with a rated voltage of 24V; and the power adapter has a rated voltage of 18V.

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