Overheating protection system and refrigerating system

Abstract

The overheating protection system comprises a temperature control switch, a processor and a voltage conversion module, the processor controls an enabling end of the voltage conversion module to be in an effective state so as to control a motor to operate normally, at the moment, the voltage conversion module carries out voltage conversion on alternating current, and the temperature control switch controls the enabling end of the voltage conversion module to be in the effective state. And when the load is overheated, the temperature control switch is switched off, the enabling end of the voltage conversion module is in an invalid state, the voltage conversion module stops outputting, and the load stops running. Therefore, the temperature control switch is automatically switched off when the load is overheated, the enabling end of the voltage conversion module is converted from an effective state to an invalid state, the voltage conversion module stops supplying power to the load, the load stops running and is not influenced by electromagnetic interference, and the safety and reliability of the overheat protection system are improved.

Description

Technical Field

[0001] This utility model relates to the field of overheat protection technology, and in particular to an overheat protection system and a refrigeration system. Background Technology

[0002] Existing refrigeration devices typically use frequency converters to control motors. Specifically, processors such as PLCs (Programmable Logic Controllers) control the motor's start and stop by controlling the frequency converter. However, this control method can cause electromagnetic interference, affecting the communication between the processor and the frequency converter. This can lead to the processor being unable to control the motor's operation properly, and when the motor overheats, it cannot effectively protect the motor, reducing the safety and reliability of the overheat protection system. Utility Model Content

[0003] The purpose of this invention is to provide an overheat protection system and a refrigeration system that can automatically disconnect the temperature control switch when the load overheats, change the enable terminal of the voltage conversion module from an active state to an inactive state, stop the voltage conversion module from supplying power to the load, and stop the load from running. This system is unaffected by electromagnetic interference and improves the safety and reliability of the overheat protection system.

[0004] To solve the above-mentioned technical problems, this utility model provides an overheat protection system, comprising:

[0005] A temperature control switch, wherein the first end of the temperature control switch is connected to the enable terminal of the voltage conversion module and the second end is connected to the processor, is used to disconnect when the load is overheated, so that the enable terminal of the voltage conversion module is in an inactive state;

[0006] The processor;

[0007] The voltage conversion module has an input terminal connected to AC power and an output terminal connected to the load. It is used to convert the AC power to supply power to the load when the enable terminal is in an active state.

[0008] Optional, also includes:

[0009] An enable switch is connected in series with the temperature control switch, and the first end of the circuit after series connection is connected to the first end of the enable terminal of the voltage conversion module, the second end is connected to the second end of the enable terminal of the voltage conversion module, and the control terminal is connected to the processor. It is used to disconnect when the load is abnormal, so that the enable terminal of the voltage conversion module is in an invalid state.

[0010] Optional, also includes:

[0011] An enable switch is connected in series with the temperature control switch, and the first end of the circuit after series connection is connected to the negative power supply port of the processor, the second end is connected to the second end of the enable terminal of the voltage conversion module, and the control terminal is connected to the processor. It is used to disconnect when the load is abnormal so that the enable terminal of the voltage conversion module is in an invalid state.

[0012] The first terminal of the enable terminal of the voltage conversion module is connected to the positive power supply port of the processor.

[0013] Optional, also includes:

[0014] A power conversion module, wherein the input terminal of the power conversion module is connected to the AC power and the output terminal is connected to the processor, is used to step down and rectify the AC power to supply power to the processor.

[0015] Optional, also includes:

[0016] A filtering module, wherein the first end of the filtering module is connected to the output end of the voltage conversion module, and the second end is connected to the load.

[0017] Optionally, the filtering module includes:

[0018] Three capacitor modules, the first end of each of the three capacitor modules is connected to the output end of the voltage conversion module respectively, and the second end of each of the three capacitor modules is grounded;

[0019] The three reactor modules are connected one-to-one with the first terminals of the three capacitor modules, and their second terminals are connected to the load.

[0020] Optional, also includes:

[0021] A fuse, located at the input terminal of the voltage conversion module, is used to disconnect the circuit between the voltage conversion module and the AC power supply when the current at the input terminal of the voltage conversion module exceeds a preset current threshold.

[0022] Optional, also includes:

[0023] The switching module has multiple input terminals connected to multiple AC power sources, and its output terminal connected to the input terminal of the voltage conversion module.

[0024] Optional, also includes:

[0025] An energy storage module is connected to the output terminal of the switching module. It is used to store energy when AC power is output from the output terminal of the switching module, and to output electrical energy to the voltage conversion module when AC power is stopped being output from the output terminal of the switching module.

[0026] To solve the above-mentioned technical problems, this utility model also provides a refrigeration system, including a motor and an overheat protection system as described above, wherein the overheat protection system is connected to the motor.

[0027] This application provides an overheat protection system and a refrigeration system. The overheat protection system includes a temperature control switch, a processor, and a voltage conversion module. The processor controls the enable terminal of the voltage conversion module to be in an active state to control the normal operation of the motor. At this time, the voltage conversion module converts the AC voltage to supply power to the load. When the load overheats, the temperature control switch disconnects, the enable terminal of the voltage conversion module becomes inactive, the voltage conversion module stops outputting power, and the load stops running. Therefore, the temperature control switch of this application automatically disconnects when the load overheats, the enable terminal of the voltage conversion module changes from an active state to an inactive state, the voltage conversion module stops supplying power to the load, and the load stops running. This is unaffected by electromagnetic interference, improving the safety and reliability of the overheat protection system. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of an overheat protection system provided by this utility model;

[0030] Figure 2 A schematic diagram of a specific overheat protection system provided by this utility model;

[0031] Figure 3 A schematic diagram of another specific overheat protection system provided by this utility model. Detailed Implementation

[0032] The core of this utility model is to provide an overheat protection system and a refrigeration system that can automatically disconnect the temperature control switch when the load overheats, change the enable terminal of the voltage conversion module from an active state to an inactive state, stop the voltage conversion module from supplying power to the load, and stop the load from running. It is unaffected by electromagnetic interference, thus improving the safety and reliability of the overheat protection system.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Existing refrigeration devices typically use frequency converters to control motors. Specifically, a processor, such as a PLC, controls the motor's start and stop by controlling the frequency converter. However, this control method can cause electromagnetic interference, affecting the communication between the processor and the frequency converter. This can lead to the processor being unable to control the motor's operation properly, and when the motor overheats, it cannot effectively protect the motor, thus reducing the safety and reliability of the overheat protection system.

[0035] Please refer to Figure 1 As shown, Figure 1 This is a schematic diagram of an overheat protection system provided by this utility model.

[0036] The overheat protection system includes:

[0037] Temperature control switch 1, the first end of temperature control switch 1 is connected to the enable terminal of voltage conversion module 3, and the second end is connected to processor 2, used to disconnect when the load is overheated, so that the enable terminal of voltage conversion module 3 is in an invalid state;

[0038] Processor 2 is used to control the enable state of the enable terminal of voltage conversion module 3;

[0039] Voltage conversion module 3 has an input terminal connected to AC power and an output terminal connected to the load. It is used to convert the AC power voltage when the enable terminal is in an active state to supply power to the load.

[0040] This overheat protection system includes a temperature control switch 1, a processor 2, and a voltage conversion module 3. The processor 2 and the voltage conversion module 3 communicate via a communication protocol. The processor 2 sends corresponding commands to the voltage conversion module 3 to control its operation, thereby driving the load. It should be noted that the load can be, but is not limited to, a motor, and the voltage conversion module 3 can be, but is not limited to, a frequency converter. The communication protocol can be CAN (Controller Area Network) bus protocol, RS-485 communication protocol, or RS232 communication protocol. The CAN bus protocol supports a large number of nodes and provides low latency and high reliability. The RS-485 communication protocol can use balanced transmission and differential reception to transmit data, and it has the ability to suppress common-mode interference. The RS232 communication protocol is simple and practical, supports bidirectional transmission and full-duplex communication, and can meet general data transmission needs. Furthermore, many devices and systems support this protocol, giving RS232 a significant advantage in terms of compatibility and interoperability.

[0041] Specifically, during normal operation, when the motor temperature is below the preset temperature threshold, the temperature control switch 1 is in the closed state. The processor 2 controls the load to work / not work by controlling the enable terminal of the voltage conversion module 3 to be in an active / inactive state. When the processor 2 controls the enable terminal of the voltage conversion module 3 to be in an active state, the voltage conversion module 3 performs voltage conversion on the AC power, converting it into the voltage actually required by the load to maintain the normal operation of the load. If the load of the voltage conversion module 3 malfunctions, including but not limited to overheating, excessive voltage, insufficient voltage, and excessive current, in order to prevent the load from continuing to operate under abnormal conditions and affecting the safety of the entire overheat protection system, the temperature control switch 1 will automatically disconnect. After the temperature control switch 1 disconnects, the enable terminal of the voltage conversion module 3 is in an inactive state, stopping the power supply to the load, thereby improving the safety and stability of the overheat protection system.

[0042] Among them, processor 2 can be a PLC. PLC has high reliability and strong anti-interference capability. It can effectively cope with various interferences in the industrial environment, thereby ensuring the stable operation of the system. In addition, PLC is small in size, light in weight, low in power consumption, and easy to install, which makes it very suitable for applications with limited space or low energy consumption requirements. PLC also has a large storage capacity and powerful I / O interface, which can realize efficient, reliable and flexible control.

[0043] As can be seen, the temperature control switch 1 of this application automatically disconnects when the load overheats, the enable terminal of the voltage conversion module 3 changes from an active state to an inactive state, the voltage conversion module 3 stops supplying power to the load, the load stops running, and is not affected by electromagnetic interference, thus improving the safety and reliability of the overheat protection system.

[0044] Based on the above embodiments:

[0045] As an optional embodiment, it also includes:

[0046] An enable switch is connected in series with the temperature control switch 1. The first end of the circuit is connected to the first end of the enable terminal of the voltage conversion module 3, the second end is connected to the second end of the enable terminal of the voltage conversion module 3, and the control terminal is connected to the processor 2. It is used to disconnect when the load is abnormal so that the enable terminal of the voltage conversion module is in an invalid state.

[0047] In this embodiment, the enable terminal includes two ports, namely a first terminal and a second terminal. When the first terminal and the second terminal are connected, the enable terminal is in an active state; when the first terminal and the second terminal are not connected, the enable terminal is in an inactive state. In practical applications, the first terminal can specifically be a DI port, and the second terminal can be GND. To control the enable terminal of the voltage conversion module 3, in this embodiment, the temperature control switch 1 is connected in series, and the first terminal of the series circuit is connected to the first terminal of the enable terminal of the voltage conversion module 3, and the second terminal is connected to the second terminal of the enable terminal of the voltage conversion module 3. When the motor overheats, the temperature control switch 1 automatically disconnects, and the enable terminal of the voltage conversion module 3 is in an inactive state. Furthermore, in practical applications, if an abnormal load occurs, the processor 2 controls the enable switch to disconnect, thereby controlling the enable terminal of the voltage conversion module 3 to be in an inactive state. The enable switch can be an internal intermediate relay or virtual switch of the processor 2, or it can be an additionally set relay.

[0048] For details, please see Figure 2 As shown, Figure 2This utility model provides a schematic diagram of a specific overheat protection system. The first terminal of the enable terminal of the voltage conversion module 3 is its upper port, and the second terminal is its lower port. During normal operation, the temperature control switch 1 is closed, and the processor 2 controls the enable switch to close. The upper port of the enable terminal of the voltage conversion module 3 is connected to the first terminal, and the enable terminal of the voltage conversion module 3 is in an active state, with the load in operation. When the load overheats, the temperature control switch 1 automatically opens, disconnecting the upper and lower ports of the enable terminal of the voltage conversion module 3, rendering the enable terminal of the voltage conversion module 3 inactive and stopping power supply to the load. Furthermore, if an abnormality occurs in the load, the processor 2 controls the enable switch to open, disconnecting the upper and lower ports of the enable terminal of the voltage conversion module 3, rendering the enable terminal of the voltage conversion module 3 inactive.

[0049] As can be seen, in this embodiment, the enable switch is set between the first and second ends of the enable terminal of the voltage conversion module 3. By controlling the opening / closing of the enable switch, the enable terminal of the voltage conversion module 3 is in an invalid / valid state, thereby realizing the control of the enable terminal of the voltage conversion module 3.

[0050] As an optional embodiment, it also includes:

[0051] The enable switch is connected in series with the temperature control switch 1. The first end of the circuit is connected to the negative power supply port of the processor 2, the second end is connected to the second end of the enable terminal of the voltage conversion module 3, and the control terminal is connected to the processor 2. It is used to disconnect when the load is abnormal so that the enable terminal of the voltage conversion module is in an invalid state.

[0052] The first terminal of the enable terminal of the voltage conversion module 3 is connected to the positive power supply port of the processor 2.

[0053] In this embodiment, to control the enable terminal of the voltage conversion module 3, the enable switch and the temperature control switch 1 are connected in series. The first end of the series circuit is connected to the negative power supply port of the processor 2, and the second end is connected to the second end of the enable terminal of the voltage conversion module 3. When both the first and second ends receive a power signal, the enable terminal is in an active state; when the first and / or second ends are disconnected from the power signal, the enable terminal is in an inactive state. Specifically, when the motor overheats, the temperature control switch 1 automatically disconnects, and the enable terminal is in an inactive state after the temperature control switch 1 disconnects. Furthermore, in practical applications, if an abnormal load occurs, the processor 2 controls the enable switch to disconnect, thereby controlling the enable terminal of the voltage conversion module 3 to be in an inactive state. The enable switch can be an internal intermediate relay or virtual switch of the processor 2, or it can be an additionally configured relay.

[0054] For details, please see Figure 3 As shown, Figure 3 This is a schematic diagram of another specific overheat protection system provided by this utility model. The first end of the enable terminal of the voltage conversion module 3 is the upper port of the enable terminal of the voltage conversion module 3, and the second end of the enable terminal of the voltage conversion module 3 is the lower port of the enable terminal of the voltage conversion module 3. During normal operation, the temperature control switch 1 is closed, and the processor 2 controls the enable switch to close. The upper port of the enable terminal of the voltage conversion module 3 is connected to the positive power supply port of the processor 2, and the lower port of the enable terminal of the voltage conversion module 3 is connected to the negative power supply port of the processor 2 through the temperature control switch 1 and the enable switch. The enable terminal of the voltage conversion module 3 is in an active state, and the load is in a working state. When the load overheats, the temperature control switch 1 automatically opens, the lower port of the enable terminal of the voltage conversion module 3 is disconnected from the negative power supply port of the processor 2, the enable terminal of the voltage conversion module 3 is in an inactive state, and power supply to the load stops. Furthermore, if an abnormality occurs in the load, the processor 2 controls the enable switch to open, disconnecting the lower port of the enable terminal of the voltage conversion module 3 from the negative power supply port of the processor 2. The enable terminal of the voltage conversion module 3 then becomes inactive, ceasing to supply power to the load. In practical applications, the first terminal can specifically be the DI port, and the second terminal can be GND. That is, whether the enable terminal of the voltage conversion module 3 is inactive is determined by whether the DI port receives a low level.

[0055] As can be seen, in this embodiment, the enable switch is set between the first and second ends of the enable terminal of the voltage conversion module 3. The processor 2 controls the opening / closing of the enable switch, thereby controlling whether the enable terminal receives power, so that the enable terminal of the voltage conversion module 3 is in an invalid / valid state.

[0056] As an optional embodiment, it also includes:

[0057] The power conversion module has an input terminal connected to AC power and an output terminal connected to the processor 2. It is used to step down and rectify the AC power to supply power to the processor 2.

[0058] Specifically, because processor 2 requires a stable power supply to ensure its normal operation, and processor 2 typically uses 24V DC power, while the power grid is generally 220V AC power. Therefore, power module 11 is needed to step down and rectify the 220V AC power to convert it into the 24V DC power required by processor 2 to ensure that processor 2 works normally.

[0059] As can be seen, this utility model utilizes a power conversion module to step down and rectify the AC power, converting the AC power from the power grid into the required DC power to provide uninterrupted power to the processor 2, thereby ensuring the normal operation of the processor 2 without the need for an additional power supply to power the processor 2.

[0060] As an optional embodiment, it also includes:

[0061] The filter module has its first end connected to the output of the voltage conversion module 3, and its second end connected to the load.

[0062] In this embodiment, in order to make the voltage input to the load smoother, reduce ripple, and thus provide a more stable input voltage, a filtering module is provided to filter out noise, making the voltage input to the load smoother.

[0063] As can be seen, the filtering module can effectively filter out noise and interference components in the output voltage of the voltage conversion module 3, smooth the DC current, remove high-frequency noise, and make the voltage input to the load more stable, thereby improving the quality of the voltage input to the load.

[0064] As an optional embodiment, the filtering module includes:

[0065] Three capacitor modules are provided, with their first terminals connected to the output terminals of voltage conversion module 3 respectively, and their second terminals grounded.

[0066] The three reactor modules have their first terminals connected to the first terminals of the three capacitor modules respectively, and their second terminals are connected to the load.

[0067] In this embodiment, three capacitor modules and three reactor modules are used as filtering modules to achieve the filtering function. If only reactor modules are used for filtering, the filtering effect can only filter out harmonics of the 11th order and above, resulting in a high harmonic content. As the requirements for power grid quality increase, the requirements for harmonic mitigation also become more stringent. In some specific implementation scenarios, the harmonic content of air conditioners must not exceed a preset harmonic content. Therefore, using a single reactor module for filtering is insufficient to meet the harmonic mitigation requirements, necessitating the use of an LC filtering scheme. To achieve the requirement of not exceeding the preset harmonic content, harmonics of the 7th order and above can be eliminated by matching the L / C parameters, ensuring that the power quality of the power grid meets the requirement of not exceeding the preset harmonic content.

[0068] Specifically, a capacitor module may include more than one capacitor, and the number and capacitance value of the capacitors can be set according to the actual situation. Similarly, a reactor module may also include more than one reactor, and the number and reactance value of the reactors can also be set according to the actual situation.

[0069] It is evident that this filtering module has a strong filtering function, capable of filtering out harmonics of the 7th order and above, thus ensuring that the power quality of the power grid meets the requirements for harmonic content.

[0070] As an optional embodiment, it also includes:

[0071] A fuse is installed at the input terminal of the voltage conversion module 3 to disconnect the circuit between the voltage conversion module 3 and the AC power when the current at the input terminal of the voltage conversion module 3 exceeds a preset current threshold.

[0072] In this embodiment, the fuse can quickly cut off the current when a short circuit occurs in the circuit, thereby preventing damage to the voltage conversion module 3 and its connected load. Specifically, when a short circuit occurs inside or outside the voltage conversion module 3, the fuse between the voltage conversion module 3 and the AC power supply will blow due to the short circuit, quickly cutting off the circuit and isolating the short circuit point from the voltage conversion module 3 and the load, thus avoiding further damage.

[0073] It is evident that the main function of a fuse in a circuit is to provide short-circuit protection, ensuring that the circuit is quickly cut off when a short circuit occurs inside or outside the voltage conversion module 3, thereby protecting the entire overheat protection system from damage.

[0074] As an optional embodiment, it also includes:

[0075] The switching module has multiple input terminals connected to multiple AC power sources, and its output terminal is connected to the input terminal of the voltage conversion module 3.

[0076] In this embodiment, to prevent a sudden load shutdown caused by a power outage or power failure on one AC power source, which could damage the voltage conversion module 3 and the load and reduce the safety and reliability of the overheat protection system, this embodiment provides multiple AC power sources for the overheat protection system. The processor 2 controls the switching module to select one AC power source to power the overheat protection system. When the AC power source experiences a power outage or power failure, the processor 2 controls the switching module to switch from the AC power source that has experienced the power outage or power failure to the AC power source that has not experienced the power outage or power failure, so as to ensure that the system can quickly switch to the backup power source when the power supply is interrupted, thus ensuring the safety and reliability of the overheat protection system.

[0077] As can be seen, this embodiment provides multiple AC power sources for the overheat protection system. The processor 2 controls the switching module to select one AC power source to power the overheat protection system. When the AC power source fails or loses power, the processor 2 controls the switching module to switch from the AC power source that has failed or lost power to the AC power source that has not failed or lost power, so as to ensure that the system can quickly switch to the backup power source when the power supply is interrupted, thus ensuring the safety and reliability of the overheat protection system.

[0078] As an optional embodiment, it also includes:

[0079] The energy storage module is connected to the output terminal of the switching module. It is used to store energy when AC power is output from the output terminal of the switching module, and to output electrical energy to the voltage conversion module 3 when AC power is stopped from being output from the output terminal of the switching module.

[0080] In this embodiment, since the switching module needs time to switch the AC power at the input terminal, in order to prevent the load from stopping operation during the AC power switching process, an energy storage module is set between the switching module and the voltage conversion module 3. Under normal working conditions, the energy storage module stores energy while the AC power supplies the load. During the switching of the AC power at the input terminal of the switching module, the energy stored in the energy storage module can supply power to the load, thus preventing the load from stopping operation due to lack of power supply during the AC power switching process.

[0081] As can be seen, this utility model sets up an energy storage module between the switching module and the voltage conversion module 3. During the switching of AC power at the input terminal of the switching module, the energy stored in the energy storage module can supply power to the load, thus avoiding the load from stopping operation due to lack of power supply during the AC power switching process.

[0082] This utility model also provides a refrigeration system, including a motor and an overheat protection system as described above, wherein the overheat protection system is connected to the motor.

[0083] In this embodiment, the overheat protection system and the motor work together to ensure the normal operation and high efficiency of the refrigeration system. Furthermore, for a detailed description of the refrigeration system provided by this invention, please refer to the above-described embodiment of the overheat protection system; further details will not be repeated here.

[0084] As can be seen, the temperature control switch 1 of this application automatically disconnects when the load overheats, the enable terminal of the voltage conversion module 3 changes from an active state to an inactive state, the voltage conversion module 3 stops supplying power to the load, the load stops running, and is not affected by electromagnetic interference, thus improving the safety and reliability of the overheat protection system.

[0085] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0086] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0087] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An overheat protection system, characterized in that, include: A temperature control switch, wherein the first end of the temperature control switch is connected to the enable terminal of the voltage conversion module and the second end is connected to the processor, is used to disconnect when the load is overheated, so that the enable terminal of the voltage conversion module is in an inactive state; The processor; The voltage conversion module has an input terminal connected to AC power and an output terminal connected to the load. It is used to convert the AC power to supply power to the load when the enable terminal is in an active state.

2. The overheat protection system as described in claim 1, characterized in that, Also includes: An enable switch is connected in series with the temperature control switch, and the first end of the circuit after series connection is connected to the first end of the enable terminal of the voltage conversion module, the second end is connected to the second end of the enable terminal of the voltage conversion module, and the control terminal is connected to the processor. It is used to disconnect when the load is abnormal, so that the enable terminal of the voltage conversion module is in an invalid state.

3. The overheat protection system as described in claim 1, characterized in that, Also includes: An enable switch is connected in series with the temperature control switch, and the first end of the circuit is connected to the negative power supply port of the processor, the second end is connected to the second end of the enable terminal of the voltage conversion module, and the control terminal is connected to the processor. It is used to disconnect when the load is abnormal so that the enable terminal of the voltage conversion module is in an invalid state. The first terminal of the enable terminal of the voltage conversion module is connected to the positive power supply port of the processor.

4. The overheat protection system as described in claim 1, characterized in that, Also includes: A power conversion module, wherein the input terminal of the power conversion module is connected to the AC power and the output terminal is connected to the processor, is used to step down and rectify the AC power to supply power to the processor.

5. The overheat protection system as described in claim 1, characterized in that, Also includes: A filtering module, wherein the first end of the filtering module is connected to the output end of the voltage conversion module, and the second end is connected to the load.

6. The overheat protection system as described in claim 5, characterized in that, The filtering module includes: Three capacitor modules, the first end of each of the three capacitor modules is connected to the output end of the voltage conversion module respectively, and the second end of each of the three capacitor modules is grounded; The three reactor modules are connected one-to-one with the first terminals of the three capacitor modules, and their second terminals are connected to the load.

7. The overheat protection system as described in claim 1, characterized in that, Also includes: A fuse, located at the input terminal of the voltage conversion module, is used to disconnect the circuit between the voltage conversion module and the AC power supply when the current at the input terminal of the voltage conversion module exceeds a preset current threshold.

8. The overheat protection system according to any one of claims 1 to 7, characterized in that, Also includes: The switching module has multiple input terminals connected to multiple AC power sources, and its output terminal connected to the input terminal of the voltage conversion module.

9. The overheat protection system as described in claim 8, characterized in that, Also includes: An energy storage module is connected to the output terminal of the switching module. It is used to store energy when AC power is output from the output terminal of the switching module, and to output electrical energy to the voltage conversion module when AC power is stopped being output from the output terminal of the switching module.

10. A refrigeration system, characterized in that, It includes a motor and an overheat protection system as described in any one of claims 1 to 9, wherein the overheat protection system is connected to the motor.

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