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 the enabling end of the voltage conversion module to be in an effective state so as to control normal operation of a motor, and at the moment, the voltage conversion module carries out voltage conversion on alternating current so as to supply power to a load; 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] The present invention relates to the technical field of overheat protection, and in particular to an overheat protection system and a refrigeration system. Background Art

[0002] Existing refrigeration devices usually use frequency converters to control motors. Specifically, a processor such as a PLC (Programmable Logic Controller) controls the start and stop of the motor by controlling the frequency converter. However, this control method will cause electromagnetic interference, affecting the communication between the processor and the frequency converter, resulting in the processor being unable to control the motor operation normally. When the motor overheats, the motor cannot be effectively protected, reducing the safety and reliability of the overheat protection system. Summary of the invention

[0003] The purpose of the present invention is to provide an overheating protection system and a refrigeration system, which can automatically disconnect the temperature control switch when the load is overheated, and the enable end of the voltage conversion module is changed from a valid state to an invalid state. The voltage conversion module stops supplying power to the load, and the load stops running, and is not affected by electromagnetic interference, thereby improving the safety and reliability of the overheating protection system.

[0004] In order to solve the above technical problems, the present invention provides an overheat protection system, comprising:

[0005] A temperature-controlled switch, wherein a first end of the temperature-controlled switch is connected to the enable end of the voltage conversion module, and a second end of the temperature-controlled switch is connected to the processor, and is used to be disconnected when the load is overheated, so that the enable end of the voltage conversion module is in an invalid state;

[0006] The processor is used to control the enable state of the enable terminal of the voltage conversion module;

[0007] The voltage conversion module, the input end of which is connected to the alternating current, and the output end of which is connected to the load, is used to perform voltage conversion on the alternating current when the enabling end is in a valid state to power the load.

[0008] Optionally, also include:

[0009] An enabling switch, wherein the enabling switch is connected in series with the temperature control switch, and a first end of the series circuit is connected to a first end of the enabling end of the voltage conversion module, and a second end is connected to a second end of the enabling end of the voltage conversion module;

[0010] The processor is connected to the control end of the enable switch, and is also used to control the enable switch to be disconnected when an abnormality occurs in the load, so that the enable end of the voltage conversion module is in an invalid state.

[0011] Optionally, also include:

[0012] An enabling switch, wherein the enabling switch is connected in series with the temperature control switch, and a first end of the series circuit is connected to the negative power supply port of the processor, and a second end is connected to the second end of the enabling end of the voltage conversion module;

[0013] A first end of the enable terminal of the voltage conversion module is connected to the positive power supply port of the processor;

[0014] The processor is connected to the control end of the enable switch, and is also used to control the enable switch to be disconnected when an abnormality occurs in the load, so that the enable end of the voltage conversion module is in an invalid state.

[0015] Optionally, also include:

[0016] A power conversion module, wherein the input end of the power conversion module is connected to the alternating current, and the output end is connected to the processor, and is used to step down and rectify the alternating current to power the processor.

[0017] Optionally, also include:

[0018] A filter module, wherein a first end of the filter module is connected to the output end of the voltage conversion module, and a second end of the filter module is connected to the load.

[0019] Optionally, the filtering module includes:

[0020] Three capacitor modules, wherein the first ends of the three capacitor modules are connected to the output end of the voltage conversion module in a one-to-one correspondence, and the second ends of the three capacitor modules are grounded;

[0021] Three reactor modules, the first ends of the three reactor modules are connected to the first ends of the three capacitor modules in a one-to-one correspondence, and the second ends are connected to the load.

[0022] Optionally, also include:

[0023] A fuse is arranged at the input end of the voltage conversion module, and is used to disconnect the circuit between the voltage conversion module and the alternating current when the current at the input end of the voltage conversion module is greater than a preset current threshold.

[0024] Optionally, also include:

[0025] A switching module, wherein multiple input terminals of the switching module are respectively connected to multiple alternating currents, and an output terminal is connected to an input terminal of the voltage conversion module.

[0026] Optionally, also include:

[0027] An energy storage module is connected to the output end of the switching module and is used to store energy when the output end of the switching module outputs alternating current, and to output electric energy to the voltage conversion module when the output end of the switching module stops outputting alternating current.

[0028] In order to solve the above technical problem, the present invention further provides a refrigeration system, comprising a motor and the above-mentioned overheating protection system, wherein the overheating protection system is connected to the motor.

[0029] The present application provides an overheating protection system and a refrigeration system, wherein the overheating protection system includes a temperature control switch, a processor, and a voltage conversion module, wherein the processor controls the enable end of the voltage conversion module to be in an effective state to control the normal operation of the motor, at which time the voltage conversion module performs voltage conversion on the alternating current to supply power to the load, and when the load is overheated, the temperature control switch is disconnected, the enable end of the voltage conversion module is in an invalid state, the voltage conversion module stops outputting, and the load stops running. It can be seen that the temperature control switch of the present application automatically disconnects when the load is overheated, the enable end of the voltage conversion module is changed 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 affected by electromagnetic interference, thereby improving the safety and reliability of the overheating protection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the prior art and the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic structural diagram of an overheat protection system provided by the present invention;

[0032] Figure 2 A schematic structural diagram of a specific overheat protection system provided by the present invention;

[0033] Figure 3 A schematic structural diagram of another specific overheating protection system provided by the present invention. DETAILED DESCRIPTION

[0034] The core of the present invention is to provide an overheating protection system and a refrigeration system, which can automatically disconnect the temperature control switch when the load is overheated, and the enable end of the voltage conversion module is changed from a valid state to an invalid state. The voltage conversion module stops supplying power to the load, and the load stops running, and is not affected by electromagnetic interference, thereby improving the safety and reliability of the overheating protection system.

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Existing refrigeration devices usually use frequency converters to control motors. Specifically, a processor such as a PLC controls the start and stop of the motor by controlling the frequency converter. However, this control method will cause electromagnetic interference, affecting the communication between the processor and the frequency converter, resulting in the processor being unable to control the motor operation normally. When the motor overheats, the motor cannot be effectively protected, reducing the safety and reliability of the overheat protection system.

[0037] Please refer to Figure 1 As shown, Figure 1 A schematic structural diagram of an overheat protection system provided by the present invention.

[0038] The overheat protection system comprises:

[0039] A temperature control switch 1, wherein a first end of the temperature control switch 1 is connected to an enable end of the voltage conversion module 3, and a second end of the temperature control switch 1 is connected to the processor 2, and is used to disconnect when the load is overheated, so that the enable end of the voltage conversion module 3 is in an invalid state;

[0040] Processor 2, used for controlling the enabling state of the enabling terminal of the voltage conversion module 3;

[0041] The voltage conversion module 3 has an input terminal connected to the AC power and an output terminal connected to the load, and is used to perform voltage conversion on the AC power when the enabling terminal is in a valid state to supply power to the load.

[0042] The overheat protection system includes a temperature control switch 1, a processor 2 and a voltage conversion module 3, wherein the processor 2 and the voltage conversion module 3 communicate through a communication protocol, and the processor 2 sends corresponding instructions to the voltage conversion module 3 to control the operation of the voltage conversion module 3, thereby driving the operation of the load. It should be noted that the load here can be but not limited to a motor, and the voltage conversion module 3 can be but not limited to a frequency converter. The communication protocol can be a CAN (Controller Area Network) bus protocol, a 485 communication protocol, or an RS232 communication protocol. The CAN bus protocol supports a large number of nodes and can provide low latency and high reliability; the 485 communication protocol can adopt the RS-485 communication protocol, which transmits data in a balanced transmission and differential reception manner and 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 requirements; in addition, many devices and systems support this protocol. This makes RS232 have obvious advantages in compatibility and interoperability.

[0043] Specifically, during normal operation, the temperature of the motor is lower than a preset temperature threshold, the temperature control switch 1 is in a closed state, and the processor 2 controls the load to work / not work by controlling the enable end of the voltage conversion module 3 to be in a valid / invalid state. When the processor 2 controls the enable port of the voltage conversion module 3 to be in a valid state, the voltage conversion module 3 performs voltage conversion on the AC power and converts 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 is abnormal, the load abnormality includes but is not limited to load overheating, excessive voltage, too low voltage, and excessive current. In order to avoid the load from continuing to run under abnormal conditions and affecting the safety of the entire overheating protection system, the temperature control switch 1 will automatically disconnect at this time. After the temperature control switch 1 is disconnected, the enable end of the voltage conversion module 3 is in an invalid state, and the load is stopped from being powered, thereby improving the safety and stability of the overheating protection system.

[0044] Among them, processor 2 can be a PLC, which has high reliability and strong anti-interference ability. It can effectively deal 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 where space is limited or low energy consumption is required. PLC also has a large storage capacity and a powerful I / O interface, which can achieve efficient, reliable and flexible control.

[0045] It can be seen that the temperature control switch 1 of the present application is automatically disconnected when the load is overheated, the enable end of the voltage conversion module 3 is changed from a valid state to an invalid state, the voltage conversion module 3 stops supplying power to the load, the load stops running, and is not affected by electromagnetic interference, thereby improving the safety and reliability of the overheating protection system.

[0046] Based on the above embodiments:

[0047] As an optional embodiment, it also includes:

[0048] An enabling switch, wherein the enabling switch is connected in series with the temperature control switch 1 and a first end of the series circuit is connected to a first end of the enabling end of the voltage conversion module 3, and a second end is connected to a second end of the enabling end of the voltage conversion module 3;

[0049] The processor 2 is connected to the control end of the enable switch, and is also used to control the enable switch to be disconnected when an abnormality occurs in the load, so that the enable end of the voltage conversion module 3 is in an invalid state.

[0050] In this embodiment, the enable end includes two ports, namely, a first end and a second end. When the first end and the second end are connected, the enable end is in a valid state, and when the first end and the second end are not connected, the enable end is in an invalid state. In practical applications, the first end can be a DI port, and the second end can be GND. In order to control the enable end of the voltage conversion module 3, in this embodiment, the temperature control switch 1 is connected in series, and the first end of the circuit after the series connection is connected to the first end of the enable end of the voltage conversion module 3, and the second end is connected to the second end of the enable end of the voltage conversion module 3. When the motor is overheated, the temperature control switch 1 is automatically disconnected, and the enable end of the voltage conversion module 3 is in an invalid state. In addition, in practical applications, if the load is abnormal, the processor 2 controls the disconnection of the enable switch, thereby controlling the enable end of the voltage conversion module 3 to be in an invalid state, wherein the enable switch can be an intermediate relay or a virtual switch inside the processor 2, or it can be an additionally set relay.

[0051] For details, see Figure 2 As shown, Figure 2The present invention provides a structural schematic diagram of a specific overheat protection system, wherein the first end of the enable end of the voltage conversion module 3 is the upper port of the enable end of the voltage conversion module 3, and the second end of the enable end of the voltage conversion module 3 is the lower port of the enable end of the voltage conversion module 3. In normal operation, the temperature control switch 1 is in a closed state, the processor 2 controls the enable switch to be closed, the upper port of the enable end of the voltage conversion module 3 is connected to the first end of the enable end of the voltage conversion module 3, the enable end of the voltage conversion module 3 is in a valid state, and the load is in a working state; when the load is overheated, the temperature control switch 1 is automatically disconnected, the upper port of the enable end of the voltage conversion module 3 is disconnected from the lower port of the enable end of the voltage conversion module 3, the enable end of the voltage conversion module 3 is in an invalid state, and the load is stopped from being powered. In addition, if the load is abnormal, the processor 2 controls the enable switch to be disconnected, the upper port of the enable end of the voltage conversion module 3 is disconnected from the lower port of the enable end of the voltage conversion module 3, and the enable end of the voltage conversion module 3 is in an invalid state.

[0052] It can be seen that in this embodiment, the enable switch is set between the first end and the second end of the enable end of the voltage conversion module 3, and the enable end of the voltage conversion module 3 is placed in an invalid / valid state by controlling the opening / closing of the enable switch, thereby realizing the control of the enable end of the voltage conversion module 3.

[0053] As an optional embodiment, it also includes:

[0054] An enabling switch, wherein the enabling switch is connected in series with the temperature control switch 1 and a first end of the series circuit is connected to the negative power supply port of the processor 2, and a second end is connected to the second end of the enabling end of the voltage conversion module 3;

[0055] A first end of the enable terminal of the voltage conversion module 3 is connected to the positive power supply port of the processor 2;

[0056] The processor 2 is connected to the control end of the enable switch, and is also used to control the enable switch to be disconnected when an abnormality occurs in the load, so that the enable end of the voltage conversion module 3 is in an invalid state.

[0057] In this embodiment, in order to control the enable end of the voltage conversion module 3, the enable switch is connected in series with the temperature control switch 1, and 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 end of the voltage conversion module 3. When the first end and the second end both receive the power signal, the enable end is in a valid state, and when the first end and / or the second end are disconnected from the power signal, the enable end is in an invalid state. Specifically, when the motor is overheated, the temperature control switch 1 is automatically disconnected, and the enable end is in an invalid state after the temperature control switch 1 is disconnected. In addition, in actual applications, if the load is abnormal, the processor 2 controls the enable end of the voltage conversion module 3 to be in an invalid state by controlling the disconnection of the enable switch, wherein the enable switch can be an intermediate relay or a virtual switch inside the processor 2, or it can be an additionally provided relay.

[0058] For details, see Figure 3 As shown, Figure 3 A structural schematic diagram of another specific overheating protection system provided by the present invention, wherein the first end of the enable end of the voltage conversion module 3 is the upper port of the enable end of the voltage conversion module 3, and the second end of the enable end of the voltage conversion module 3 is the lower port of the enable end of the voltage conversion module 3. During normal operation, the temperature control switch 1 is in a closed state, the processor 2 controls the enable switch to be closed, the upper port of the enable end 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 end 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 end of the voltage conversion module 3 is in a valid state, and the load is in a working state; when the load is overheated, the temperature control switch 1 is automatically disconnected, the lower port of the enable end of the voltage conversion module 3 is disconnected from the negative power supply port of the processor 2, the enable end of the voltage conversion module 3 is in an invalid state, and power supply to the load is stopped. In addition, if the load is abnormal, the processor 2 controls the enable switch to be disconnected, the lower port of the enable end of the voltage conversion module 3 is disconnected from the negative power supply port of the processor 2, and the enable end of the voltage conversion module 3 is in an invalid state, and stops supplying power to the load. In practical applications, the first end can be a DI port, and the second end can be GND, that is, whether the enable end of the voltage conversion module 3 is in an invalid state is determined by whether the DI port receives a low level.

[0059] It can be seen that in this embodiment, the enable switch is set between the first end and the second end of the enable end of the voltage conversion module 3, and the processor 2 is used to control the opening / closing of the enable switch, thereby controlling whether the enable end receives power, thereby making the enable end of the voltage conversion module 3 in an invalid / valid state.

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

[0061] A power conversion module, the input end of the power conversion module is connected to the alternating current, and the output end is connected to the processor 2, and is used to step down and rectify the alternating current to power the processor 2.

[0062] Specifically, because the processor 2 requires a stable power supply to ensure its normal operation, and the processor 2 usually uses 24V DC power, while the power grid is generally 220V AC power. Therefore, it is necessary to step down and rectify the 220V AC power through the power module 11, and convert it into the 24V DC power required by the processor 2 to ensure the normal operation of the processor 2.

[0063] It can be seen that the present invention utilizes the power conversion module to step down and rectify the AC power respectively, and converts the AC power of the power grid into the required DC power to provide uninterrupted power to the processor 2 to ensure the normal operation of the processor 2, without the need to set up an additional power supply to power the processor 2.

[0064] As an optional embodiment, it also includes:

[0065] A filter module, wherein a first end of the filter module is connected to the output end of the voltage conversion module 3, and a second end of the filter module is connected to the load.

[0066] In this embodiment, in order to make the voltage input to the load smoother and reduce pulsation, thereby providing a more stable input voltage, this embodiment provides a filtering module for filtering out clutter, so that the voltage input to the load is smoother.

[0067] It can be seen that the filtering module can effectively filter out the noise and interference components in the output voltage output by the voltage conversion module 3, smooth the direct current, remove high-frequency noise, make the voltage input to the load more stable, and thus improve the quality of the voltage input to the load.

[0068] As an optional embodiment, the filtering module includes:

[0069] Three capacitor modules, the first ends of the three capacitor modules are connected to the output end of the voltage conversion module 3 one by one, and the second ends of the three capacitor modules are grounded;

[0070] Three reactor modules, the first ends of the three reactor modules are connected to the first ends of the three capacitor modules in a one-to-one correspondence, and the second ends are connected to the load.

[0071] In this embodiment, three capacitor modules and three reactor modules are used as filtering modules to realize the filtering function. If only the reactor module is used for filtering, the filtering effect is that only harmonics above the 11th order can be filtered out, and the harmonic content is relatively high. As the requirements for the quality of the power grid become higher, the requirements for the control of power grid harmonics are also getting higher and higher. In some specific implementation scenarios, the harmonic content of the air conditioner is required not to be higher than the preset harmonic content. Therefore, it is difficult to meet the harmonic control requirements by filtering with a separate reactor module, and an LC filtering solution is required. In order to meet the requirement of not exceeding the preset harmonic content, harmonics above the 7th order can be eliminated by matching the parameters of L\C, so that the power quality of the power grid meets the requirement of not exceeding the preset harmonic content.

[0072] Specifically, the capacitor module may include more than one capacitor, and the specific number and capacitance of the capacitors may be set according to actual conditions. Similarly, the reactor module may also include more than one reactor, and the specific number and reactance of the reactors may also be set according to actual conditions.

[0073] It can be seen that the filter module has a strong filtering function and can filter out harmonics above the 7th order, so that the power quality of the power grid meets the requirements of harmonic content.

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

[0075] The fuse is arranged at the input end of the voltage conversion module 3 and is used to disconnect the circuit between the voltage conversion module 3 and the alternating current when the current at the input end of the voltage conversion module 3 is greater than a preset current threshold.

[0076] In this embodiment, the fuse can quickly cut off the current when a short circuit occurs in the circuit, thereby preventing the voltage conversion module 3 and the load connected thereto from being damaged. 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 will blow due to the short circuit, quickly cut off the circuit, and isolate the short circuit point from the voltage conversion module 3 and the load to avoid further damage.

[0077] It can be seen that the function of the fuse in the circuit is mainly to provide short-circuit protection to ensure 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.

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

[0079] The switching module has multiple input terminals connected to multiple AC power supplies, and the output terminal is connected to the input terminal of the voltage conversion module 3.

[0080] In this embodiment, in order to avoid a sudden shutdown of the load due to a power outage or power failure of one AC power line, thereby damaging the voltage conversion module 3 and the load, and reducing the safety and reliability of the overheating protection system, this embodiment provides multiple AC power lines for the overheating protection system, and the processor 2 controls the switching module to select one AC power line to power the overheating protection system. When the AC power line is out of power or power failure, the processor 2 controls the switching module to switch from the AC power that is out of power or power failure to the AC power that is not out of power or power failure, so as to ensure that it can quickly switch to the backup power supply when the power is interrupted, thereby ensuring the safety and reliability of the overheating protection system.

[0081] It can be seen that this embodiment provides multiple AC power lines for the overheating protection system. The processor 2 controls the switching module to select one AC power line to power the overheating protection system. When the AC power line is cut off or powered off, the processor 2 controls the switching module to switch from the AC power that is cut off or powered off to the AC power that is not cut off or powered off, so as to ensure that it can quickly switch to the backup power supply when the power is interrupted, thereby ensuring the safety and reliability of the overheating protection system.

[0082] As an optional embodiment, it also includes:

[0083] The energy storage module is connected to the output end of the switching module and is used to store energy when the output end of the switching module outputs alternating current, and output electric energy to the voltage conversion module 3 when the output end of the switching module stops outputting alternating current.

[0084] In this embodiment, since the switching module needs switching time to switch the AC power at the input end, in order to prevent the load from stopping during the switching of the AC power, the present application sets an energy storage module 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 power to the load. During the switching module switching of the AC power at the input end, the energy stored in the energy storage module can be used to power the load, thereby preventing the load from stopping due to lack of power supply during the AC power switching process.

[0085] It can be seen that the present invention sets an energy storage module between the switching module and the voltage conversion module 3, so that the energy stored in the energy storage module can be used to power the load during the process of switching the AC power at the input end of the switching module, thereby avoiding the load from stopping operation due to lack of power supply during the AC power switching process.

[0086] The present invention also provides a refrigeration system, comprising a motor and the above-mentioned overheating protection system, wherein the overheating protection system is connected to the motor.

[0087] In this embodiment, the overheat protection system and the motor work together to ensure the normal operation and high efficiency of the refrigeration system. In addition, the introduction of a refrigeration system provided by the present invention can refer to the above-mentioned embodiment of the overheat protection system, and the present invention will not be repeated here.

[0088] It can be seen that the temperature control switch 1 of the present application is automatically disconnected when the load is overheated, the enable end of the voltage conversion module 3 is changed from a valid state to an invalid state, the voltage conversion module 3 stops supplying power to the load, the load stops running, and is not affected by electromagnetic interference, thereby improving the safety and reliability of the overheating protection system.

[0089] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0090] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0091] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An overheat protection system, characterized in that: include: A temperature-controlled switch, wherein a first end of the temperature-controlled switch is connected to the enable end of the voltage conversion module, and a second end of the temperature-controlled switch is connected to the processor, and is used to be disconnected when the load is overheated, so that the enable end of the voltage conversion module is in an invalid state; The processor is used to control the enable state of the enable terminal of the voltage conversion module; The voltage conversion module, the input end of which is connected to the alternating current, and the output end of which is connected to the load, is used to perform voltage conversion on the alternating current when the enabling end is in a valid state to power the load.

2. The overheat protection system according to claim 1, characterized in that: Also includes: An enabling switch, wherein the enabling switch is connected in series with the temperature control switch, and a first end of the series circuit is connected to a first end of the enabling end of the voltage conversion module, and a second end is connected to a second end of the enabling end of the voltage conversion module; The processor is connected to the control end of the enable switch, and is also used to control the enable switch to be disconnected when an abnormality occurs in the load, so that the enable end of the voltage conversion module is in an invalid state.

3. The overheat protection system according to claim 1, characterized in that: Also includes: An enabling switch, wherein the enabling switch is connected in series with the temperature control switch, and a first end of the series circuit is connected to the negative power supply port of the processor, and a second end is connected to the second end of the enabling end of the voltage conversion module; A first end of the enable terminal of the voltage conversion module is connected to the positive power supply port of the processor; The processor is connected to the control end of the enable switch, and is also used to control the enable switch to be disconnected when an abnormality occurs in the load, so that the enable end of the voltage conversion module is in an invalid state.

4. The overheat protection system according to claim 1, characterized in that: Also includes: A power conversion module, wherein the input end of the power conversion module is connected to the alternating current, and the output end is connected to the processor, and is used to step down and rectify the alternating current to power the processor.

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

6. The overheat protection system according to claim 5, characterized in that: The filtering module comprises: Three capacitor modules, wherein the first ends of the three capacitor modules are connected to the output end of the voltage conversion module in a one-to-one correspondence, and the second ends of the three capacitor modules are grounded; Three reactor modules, the first ends of the three reactor modules are connected to the first ends of the three capacitor modules in a one-to-one correspondence, and the second ends are connected to the load.

7. The overheat protection system according to claim 1, characterized in that: Also includes: A fuse is arranged at the input end of the voltage conversion module, and is used to disconnect the circuit between the voltage conversion module and the alternating current when the current at the input end of the voltage conversion module is greater than a preset current threshold.

8. The overheat protection system according to any one of claims 1 to 7, characterized in that: Also includes: A switching module, wherein multiple input terminals of the switching module are respectively connected to multiple alternating currents, and an output terminal is connected to an input terminal of the voltage conversion module.

9. The overheat protection system according to claim 8, characterized in that: Also includes: An energy storage module is connected to the output end of the switching module and is used to store energy when the output end of the switching module outputs alternating current, and to output electric energy to the voltage conversion module when the output end of the switching module stops outputting alternating current.

10. A refrigeration system, characterized in that: The invention comprises a motor and an overheating protection system as claimed in any one of claims 1 to 9, wherein the overheating protection system is connected to the motor.

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