A control method and device of a frequency converter and the frequency converter

Abstract

The application discloses a control method and device of a frequency converter and the frequency converter, and applies to the technical field of electronics. In the method, if a fire over-control function of the frequency converter is enabled, a controller monitors a fire signal of an area to which the frequency converter belongs. If the fire signal is acquired, the frequency converter is controlled to enter a working state and a control of an overheat protection signal is ignored. Then, a current fire degree is analyzed and a working frequency of the frequency converter is adjusted according to the current fire degree. Compared with an original scheme of directly stopping the frequency converter due to heat, the control scheme provided by the application can control the frequency converter to continue working after the fire occurs, so that smoke in a building can be discharged in time and air quality in the building is maintained. In addition, the controller also controls the working frequency of the frequency converter according to the current fire degree, so that the smoke is discharged as much as possible and the probability of a safety accident is reduced.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a control method, device, and frequency converter for a frequency converter. Background Technology

[0002] Heating, ventilation, and air conditioning (HVAC) systems are air conditioners that provide heating, ventilation, and air conditioning functions. In practical applications, inverters control the operation of HVAC fan equipment. Inverters are power control devices that use variable frequency technology and microelectronics to control AC motors by changing the frequency of the motor's power supply. Most inverters have protection modules; for example, if an inverter malfunctions and its temperature exceeds a preset value, it will shut down to prevent damage to the machine.

[0003] However, in the event of a fire in a building or similar setting, the inverter itself may not be faulty. The fire could cause the inverter's protection module to detect excessively high temperatures and shut down the inverter. However, in a fire, the building will contain a large amount of smoke, requiring HVAC fans to operate for ventilation. If the inverter stops, the smoke cannot be expelled in time, potentially leading to a serious safety hazard.

[0004] Therefore, how to prevent frequency converters from shutting down directly in a fire scenario is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a control method, device, and frequency converter for a frequency converter, in order to solve the problem that smoke inside the building cannot be discharged in a timely manner due to the direct shutdown of the frequency converter in a fire scenario.

[0006] To solve the above-mentioned technical problems, this application provides a control method for a frequency converter, comprising:

[0007] If the fire control function of the frequency converter is enabled, the fire signal of the area to which the frequency converter belongs is monitored;

[0008] If the fire signal is received, the inverter is controlled to enter the working state and the control of the overheat protection signal is ignored;

[0009] The fire signal is analyzed to determine the current fire severity in the area to which the frequency converter belongs, and the operating frequency of the frequency converter is adjusted according to the current fire severity.

[0010] Preferably, adjusting the operating frequency of the frequency converter according to the current fire severity includes:

[0011] The target operating frequency of the frequency converter is determined based on the current fire severity.

[0012] Obtain the current operating frequency of the frequency converter;

[0013] If the current operating frequency is higher than the target operating frequency, then reduce the operating frequency of the inverter to the target operating frequency;

[0014] If the current operating frequency is lower than the target operating frequency, then the operating frequency of the inverter is increased to the target operating frequency.

[0015] Preferably, the frequency converter includes a running input terminal and a boost input terminal. If the running input terminal signal is valid and the boost input terminal signal is invalid, the frequency converter operates at a first preset frequency; if the running input terminal signal is valid and the boost input terminal signal is valid, the frequency converter operates at a second preset frequency; if the running input terminal signal is invalid, the frequency converter stops; wherein, the second preset frequency is greater than the first preset frequency.

[0016] Correspondingly, adjusting the operating frequency of the frequency converter according to the current fire severity includes:

[0017] Determine whether the current fire severity exceeds a preset level; wherein the fire severity is pre-divided into multiple levels, with higher levels indicating more severe fires.

[0018] If not, a valid signal is sent to the operation input terminal to control the frequency converter to operate at the first preset frequency;

[0019] If so, a valid signal is sent to both the operation input terminal and the frequency up input terminal to control the inverter to operate at the second preset frequency.

[0020] Preferably, the fire signal includes a level signal and a pulse signal;

[0021] If the fire signal is a level signal, then the control to control the frequency converter to enter the working state and ignore the overheat protection signal when the fire signal is obtained includes:

[0022] If the fire signal is received, the inverter is controlled to enter the working state and the control of the overheat protection signal is ignored, and the normal working mode is restored after the fire signal fails.

[0023] If the fire signal is a pulse signal, then the control to control the frequency converter to enter the working state and ignore the overheat protection signal when the fire signal is acquired includes:

[0024] If the fire signal is received, the inverter is controlled to enter the working state and the control of the overheat protection signal is ignored, and the current state is maintained after the fire signal fails.

[0025] Preferably, if the fire signal is a level signal, then the control step of controlling the frequency converter to enter the working state and ignoring the overheat protection signal when the fire signal is acquired includes:

[0026] If the fire signal is detected, the inverter is controlled to enter a standby state and the changes in the fire signal are monitored.

[0027] If the fire signal remains valid after the first preset time, the inverter is controlled to enter the working state and the control of the overheat protection signal is ignored.

[0028] If the fire signal fails after the first preset time period, the frequency converter is controlled to operate in normal mode.

[0029] Preferably, the fire signal is sent by an external fire detection device;

[0030] Correspondingly, if the fire signal is a pulse signal, then the control to control the frequency converter to enter the working state and ignore the overheat protection signal upon receiving the fire signal includes:

[0031] If the fire signal is detected, a fire confirmation signal is sent to the peripheral fire detection device, and the feedback signal of the peripheral fire detection device is monitored.

[0032] If no feedback signal is received from the external fire detection device within the second preset time period, the inverter is controlled to enter the working state and the control of the overheat protection signal is ignored.

[0033] If a feedback signal from the external fire detection device is received within the second preset time period, the inverter is controlled to operate in normal working mode.

[0034] Preferably, before monitoring the fire signal of the area to which the frequency converter belongs if the fire control function of the frequency converter is enabled, the method further includes:

[0035] The fire mode of the frequency converter is confirmed according to the received selection command; wherein, the fire mode of the frequency converter includes a first fire mode and a second fire mode;

[0036] If the inverter is in the first fire mode, then the control to control the inverter to enter the working state and ignore the overheat protection signal if the fire signal is obtained includes:

[0037] If the fire signal is detected, the inverter is controlled to enter the working state, and the control of any protection signal is ignored;

[0038] If the frequency converter is in the second fire mode, then the control to control the frequency converter to enter the working state and ignore the overheat protection signal if the fire signal is obtained includes:

[0039] If the fire signal is received, the inverter is controlled to enter the working state, and the control of any other protection signals is ignored except for the overvoltage protection signal and the overcurrent protection signal.

[0040] Preferably, the controller that controls the frequency converter has a fire alarm bit inside;

[0041] Correspondingly, after the step of controlling the inverter to enter the working state and ignoring the overheat protection signal if the fire signal is obtained, the method further includes:

[0042] The fire flag bit is set accordingly, and the setting of the fire flag bit indicates that the frequency converter has received the fire signal.

[0043] To address the aforementioned technical problems, this application also provides a control device for a frequency converter, comprising:

[0044] The monitoring module is used to monitor the fire signal in the area to which the frequency converter belongs if the fire control function of the frequency converter is enabled.

[0045] The control module is used to control the frequency converter to enter the working state and ignore the overheat protection signal if the fire signal is obtained;

[0046] The analysis and adjustment module is used to analyze the fire signal to determine the current fire severity in the area to which the frequency converter belongs, and to adjust the operating frequency of the frequency converter according to the current fire severity.

[0047] To solve the above-mentioned technical problems, this application also provides a frequency converter, including: a memory for storing computer programs;

[0048] A processor is used to execute computer programs to implement the control method of the frequency converter described above.

[0049] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the aforementioned inverter control method.

[0050] This application provides a control method for a frequency converter. If the frequency converter's fire over-control function is enabled, the controller monitors the fire signal in the area where the frequency converter is located. When a fire occurs, the controller acquires the fire signal. If a fire signal is acquired, the controller puts the frequency converter into operation and ignores the overheat protection signal. Then, the fire signal is analyzed to determine the current fire severity in the area where the frequency converter is located, and the operating frequency of the frequency converter is adjusted according to the current fire severity. Compared to the original solution where the frequency converter directly shuts down due to heat during a fire, the control scheme provided in this application can control the frequency converter to continue operating after a fire occurs, ensuring that smoke in the building can be discharged in a timely manner and maintaining the air quality in the building. In addition, the controller will also control the operating frequency of the frequency converter according to the current fire severity to ensure that smoke is discharged as much as possible and reduce the probability of safety accidents.

[0051] This application also provides a control device for a frequency converter, a frequency converter, and a computer-readable storage medium, which correspond to the above-described method and therefore have the same beneficial effects as the above-described method. Attached Figure Description

[0052] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A flowchart illustrating a control method for a frequency converter provided in this application embodiment;

[0054] Figure 2 A control system block diagram of a frequency converter provided in an embodiment of this application;

[0055] Figure 3 A flowchart illustrating the software functions of a frequency converter, provided as an embodiment of this application;

[0056] Figure 4 A structural diagram of the control device for the frequency converter provided in the embodiments of this application;

[0057] Figure 5 This is a structural diagram of a frequency converter provided in one embodiment of this application. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0059] The core of this application is to provide a control method, device, and frequency converter for a frequency converter, in order to solve the problem that smoke inside the building cannot be discharged in time when the frequency converter is directly shut down in a fire scenario.

[0060] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] In order to promptly remove smoke or maintain air quality in a building during a fire, the frequency converter needs to operate for as long as possible. Therefore, this application provides a method for controlling a frequency converter. Figure 1 A flowchart illustrating a control method for a frequency converter provided in this application embodiment; as follows: Figure 1 As shown, the method includes the following steps:

[0062] S10: If the fire control function of the frequency converter is enabled, monitor the fire signal of the area to which the frequency converter belongs.

[0063] S12: If a fire signal is received, the frequency converter is controlled to enter the working state and the control of the overheat protection signal is ignored.

[0064] S13: Analyze the fire signal to determine the current fire severity in the area where the frequency converter is located, and adjust the operating frequency of the frequency converter according to the current fire severity.

[0065] This application is primarily used in emergency scenarios such as fires. The frequency converter in this application is used to control HVAC fan equipment, enabling the switching and speed regulation of the HVAC fan equipment. The frequency converter's fire bypass function is a mode proposed specifically for fire situations. When the frequency converter's fire bypass function is disabled, the controller will control the frequency converter to operate in normal working mode. When the frequency converter's fire bypass function is enabled, the controller begins monitoring fire signals. Generally, peripheral fire detection devices are installed in the area where the frequency converter is located. After detecting a fire, the peripheral fire detection devices will send a fire signal to the frequency converter's controller. The specific type and number of peripheral fire detection devices are not limited; they can be temperature sensors, smoke detectors, etc. After a fire occurs, the temperature in the area will rise, and smoke will be generated. When the temperature rises to a certain value or the smoke concentration reaches a certain value, a fire can be set as a fire. Temperature sensors and smoke detectors can be set up and detected independently, or they can be used together to make the detection results more accurate. Figure 2 This application provides a block diagram of a frequency converter control system; specifically, the peripheral fire detection device uses a temperature sensor, such as... Figure 2As shown, temperature sensor 1, controller 2, and inverter 3 are connected in sequence. Temperature sensor 1 is used to monitor the temperature of the area where inverter 3 is located. If the fire bypass function of inverter 3 is enabled, when temperature sensor 1 detects that the ambient temperature is too high, it indicates that a fire has occurred in the area. At this time, temperature sensor 1 sends a fire signal to controller 2, and controller 2 will control inverter 3 to enter fire mode, that is, inverter 3 enters the working state and ignores the control of overheat protection signal (other protection signals may also be included, which are not limited here). When inverter 3 is running in normal working mode, it will overheat after a fire occurs, and controller 2 will send an overheat protection signal to control inverter 3 to shut down; however, inverter 3 with the fire bypass function enabled will continue to work after a fire occurs and will not be shut down by the overheat protection signal. If a fire occurs in the building, the inverter provided in this embodiment will not shut down due to overheating or other reasons, thereby ensuring that the HVAC fan equipment runs for as long as possible to achieve the purpose of removing smoke or maintaining the air quality in the building. In addition, the frequency converter can be set to different fire modes according to fire protection requirements, and automatically adjust the output frequency or speed of the frequency converter.

[0066] It should be noted that the above embodiments only limit the inverter to shut down under fire mode without being controlled by the overheat protection signal, but do not limit how the inverter specifically operates under fire mode. The inverter can include multiple different fire modes and can enter the corresponding fire mode according to the preset settings inside the controller when a fire occurs. Moreover, the operator can adjust the inverter's fire mode at any time. For example, the fire mode can specifically include a first fire mode and a second fire mode. In the first fire mode, the inverter shuts down without being controlled by any signal. In the second fire mode, the inverter shuts down without being controlled by any other signal except for overcurrent and overvoltage protection signals. The operator can select the corresponding fire mode according to actual needs.

[0067] Furthermore, the fire signal sent by the external fire detection device can be a level signal (holding input signal) or a pulse signal (instantaneous signal). When the fire signal is a level signal, the inverter maintains fire mode upon receiving the signal and exits fire mode after no fire signal is received. That is, when the fire signal is a level signal, the inverter will be in fire mode as long as the fire signal exists; if the fire signal is canceled, the inverter exits fire mode and operates in normal mode. The normally open or normally closed operating mode depends on the polarity selection of the terminals. After the inverter exits fire mode, it will report a fault normally if a fault occurs, or it can control the inverter to stop. When the fire signal is a pulse signal, the inverter enters fire mode upon receiving the signal and maintains fire mode even after no fire signal is received. That is, the inverter starts via the instantaneous input signal under a pulse signal; the normally open or normally closed operating mode depends on the polarity selection of the terminals. Upon receiving a pulse signal, the inverter will run at a preset speed, and even if the pulse signal disappears (which can be considered as the signal being disconnected due to fire damage), it will still operate at the preset speed. The frequency converter will remain in fire mode until failure or power failure, and should maintain the rotation direction it was in before the fire mode was activated. Furthermore, after exiting fire mode, if the operator shuts down the frequency converter and then powers it back on, the frequency converter should operate normally if no fire mode activation signal is received.

[0068] In an actual fire, the operating frequency of the frequency converter is not specifically required; for example, the motor can operate at full load at its rated frequency. However, generally, to allow the frequency converter to operate for a longer period and improve ventilation, its operating frequency can be positively correlated with the current fire severity. For example, the current fire severity can be determined, and it can be judged whether the fire severity exceeds a preset level. If not, the frequency converter is controlled to operate at a first preset frequency; if so, it is controlled to operate at a second preset frequency. The fire severity is pre-divided into multiple levels. For example, in practical applications, the severity of the fire can be divided into 5 levels based on temperature or smoke concentration. The higher the level (i.e., the higher the temperature or the denser the smoke), the more severe the fire. The preset level can be set to 3. The second preset frequency is greater than the first preset frequency. Based on this approach, the frequency converter can be equipped with a frequency upsampling input terminal. If the current fire severity meets the preset requirements, the signal at the frequency upsampling input terminal is valid. Furthermore, the frequency converter's operation input terminal is used to determine whether the frequency converter is operating (e.g., in fire mode, the signal at the frequency converter's operation input terminal is valid). When both the operation input terminal signal and the frequency upscaling input terminal signal are valid, the inverter is controlled to operate at the second preset frequency. When the operation input terminal signal is valid but the frequency upscaling input terminal signal is invalid, the inverter is controlled to operate at the first preset frequency. If the operation input terminal signal is invalid, the inverter decelerates and stops. If the frequency upscaling input terminal is high (valid) during the inverter's shutdown process, and subsequently, if the operation input terminal signal is valid, the inverter will accelerate to the second preset frequency until either the frequency upscaling input terminal signal or the operation input terminal signal becomes invalid. The frequency upscaling input terminal and the operation input terminal mentioned above are terminals on the inverter used to receive corresponding signals; after a valid signal is input, the corresponding terminal becomes valid.

[0069] Here, taking the above embodiment as an example, a detailed description of an actual operating condition of the frequency converter in this embodiment is provided. Figure 3 A flowchart illustrating the software function implementation of a frequency converter is provided as an embodiment of this application; such as Figure 3 As shown, the specific steps include: S20: Determine whether to enter fire mode; if not, proceed to step S21; if yes, proceed to step S22. S21: The inverter operates in normal mode. S22: Determine whether to enter the first fire mode or the second fire mode according to the internal setting instructions. S23: Determine whether the frequency boost input terminal signal is valid; if not, proceed to step S24; if yes, proceed to step S25. S24: The inverter operates at the first preset frequency. S25: The inverter operates at the second preset frequency.

[0070] This application provides a control method for a frequency converter. If the frequency converter's fire over-control function is enabled, the controller monitors the fire signal in the area where the frequency converter is located. When a fire occurs, the controller acquires the fire signal. If a fire signal is acquired, the controller puts the frequency converter into operation and ignores the overheat protection signal. Then, the fire signal is analyzed to determine the current fire severity in the area where the frequency converter is located, and the operating frequency of the frequency converter is adjusted according to the current fire severity. Compared to the original solution where the frequency converter directly shuts down due to heat during a fire, the control scheme provided in this application can control the frequency converter to continue operating after a fire occurs, ensuring that smoke in the building can be discharged in a timely manner and maintaining the air quality in the building. In addition, the controller will also control the operating frequency of the frequency converter according to the current fire severity to ensure that smoke is discharged as much as possible and reduce the probability of safety accidents.

[0071] In actual fires, the operating frequency of the frequency converter is not specifically required; generally, it can be controlled to be positively correlated with the current fire severity. This application provides a scheme for adjusting the frequency converter's operating frequency according to the current fire severity, including: determining the target operating frequency of the frequency converter based on the current fire severity, and obtaining the current operating frequency of the frequency converter. If the current operating frequency is higher than the target operating frequency, the frequency converter's operating frequency is reduced to the target operating frequency; if the current operating frequency is lower than the target operating frequency, the frequency converter's operating frequency is increased to the target operating frequency. For example, in practical applications, two preset frequencies can be set, namely a first preset frequency and a second preset frequency, with the second preset frequency being greater than the first preset frequency. Assuming the frequency converter includes a running input terminal and an upsampling input terminal, if the running input terminal signal is valid and the upsampling input terminal signal is invalid, the frequency converter operates at the first preset frequency; if both the running input terminal signal and the upsampling input terminal signal are valid, the frequency converter operates at the second preset frequency; if the running input terminal signal is invalid, the frequency converter stops. Correspondingly, adjusting the inverter's operating frequency according to the current fire severity includes: if the current fire severity does not meet the preset requirements, sending a valid signal to the operation input terminal to control the inverter to operate at a first preset frequency; if the current fire severity meets the preset requirements, sending valid signals to both the operation input terminal and the up-frequency input terminal to control the inverter to operate at a second preset frequency. Here, "the current fire severity meets the preset requirements" indicates that the fire is more severe, requiring the inverter to operate at a higher frequency to ensure timely smoke removal from the corridor. However, it should be noted that the solution provided in this application is merely one example of this application. In actual applications, the number of preset frequencies and the magnitude of the preset frequencies are not limited and can be set according to actual needs.

[0072] As mentioned in the above embodiments, the fire signal can be a level signal or a pulse signal. If the fire signal is a level signal, the controller, upon receiving the fire signal, controls the inverter to enter the working state and ignores the overheat protection signal, and resumes normal operation mode after the fire signal fails. If the fire signal is a pulse signal, the controller, upon receiving the fire signal, controls the inverter to enter the working state and ignores the overheat protection signal, and maintains the current state after the fire signal fails. That is, when the fire signal is a level signal, the inverter will be in fire mode as long as the fire signal exists; if the fire signal fails, the inverter will exit fire mode and operate in normal operation mode. When the fire signal is a pulse signal, the inverter starts through the input instantaneous signal. Upon receiving the pulse signal, the inverter will run at a preset speed, and even if the pulse signal disappears again (which can be considered as the signal being disconnected due to fire damage), it will still operate at the preset speed.

[0073] In practical applications, fire signals may be falsely triggered, therefore, it is necessary to verify the fire signal to prevent the frequency converter from entering fire mode when no fire has occurred. The verification schemes for two scenarios are described below: the fire signal is a level signal or a pulse signal. Firstly, if the fire signal is a level signal, the control to put the frequency converter into operating mode and ignore the overheat protection signal upon receiving the fire signal includes: if the fire signal is received, the frequency converter is controlled to enter a standby state and monitor changes in the fire signal; if the fire signal remains valid after a first preset time, the frequency converter is controlled to enter operating mode and ignore the overheat protection signal; if the fire signal fails after the first preset time, the frequency converter is controlled to operate in normal mode. That is, if the level signal is only valid for a short time, it is likely a false trigger, and the frequency converter will not enter fire mode in this case. Secondly, the fire signal is limited to be sent by the external fire detection device. Correspondingly, if the fire signal is a pulse signal, the control mechanism that activates the frequency converter and ignores the overheat protection signal upon receiving the fire signal includes: sending a fire confirmation signal to the external fire detection device and monitoring the feedback signal from the external fire detection device; if no feedback signal is received from the external fire detection device within a second preset time period, controlling the frequency converter to enter the operating state and ignoring the overheat protection signal; if a feedback signal is received from the external fire detection device within the second preset time period, controlling the frequency converter to operate in normal working mode. Because the pulse signal is instantaneously triggered and cannot be verified by the length of its effective time, the controller will send a fire confirmation signal to the external fire detection device. The external fire detection device will send a feedback signal indicating a false trigger if no fire has occurred. Furthermore, when a fire occurs, the external fire detection device will not send any feedback signal, and the frequency converter will enter fire mode after the second preset time period. This is because if the external fire detection device uses feedback signals to indicate the occurrence of a fire, the signal transmission may fail due to the fire, causing the inverter's controller to not receive the signal, and thus the inverter will be unable to enter fire mode after a fire occurs. Furthermore, the specific lengths of the aforementioned first and second preset durations are not limited.

[0074] The above embodiments do not specifically limit the fire mode of the frequency converter. This application provides a specific implementation method, which includes a first fire mode and a second fire mode. The frequency converter enters the corresponding fire mode according to the setting instruction. In the first fire mode, the frequency converter will no longer be controlled by any external signals or internal alarm signals, and the frequency converter will continue to run until it is burned out or the power is cut off. If the power supply to the frequency converter is cut off and it is not burned out in the fire, when the frequency converter is restarted, if it does not enter the fire mode, the frequency converter will be able to run in normal mode again. In the second fire mode, except for receiving overcurrent and overvoltage protection signals that require the frequency converter to stop, the frequency converter will no longer be controlled by any other external signals or other internal alarm signals, and the frequency converter will continue to run until it is burned out or the power is cut off. If the power supply to the frequency converter is cut off and it is not burned out in the fire, when the frequency converter is restarted, if it does not enter the fire mode, the frequency converter will be able to run in normal mode again. The specific solution provided in this application embodiment is as follows: If the fire over-control function of the frequency converter is enabled, before monitoring the fire signal of the area to which the frequency converter belongs, the controller will confirm the fire mode of the frequency converter according to the received selection instruction; if the frequency converter is in the first fire mode, if the controller obtains a fire signal, it will control the frequency converter to enter the working state and ignore the control of any protection signals. If the frequency converter is in the second fire mode, if the controller obtains a fire signal, it will control the frequency converter to enter the working state and ignore the control of any other protection signals except for overvoltage protection signals and overcurrent protection signals.

[0075] In addition, in practical applications, a fire flag can be set. If a fire signal is detected, the frequency converter is controlled to enter the fire mode. By setting the fire flag to record the frequency converter's entry into the fire mode, the frequency converter can be characterized as having entered the fire mode. The number of times the frequency converter has entered the fire mode can also be recorded, which makes it easier for staff to obtain historical data.

[0076] In the above embodiments, the control method of the frequency converter has been described in detail. This application also provides a control device for the frequency converter and corresponding embodiments of the frequency converter. It should be noted that this application describes the embodiments of the device and the frequency converter from two perspectives: one is based on the functional module, and the other is based on the hardware.

[0077] From the perspective of functional modules, this embodiment provides a control device for a frequency converter. Figure 4 A structural diagram of the control device for the frequency converter provided in the embodiments of this application is shown below. Figure 4 As shown, the device includes:

[0078] The monitoring module 11 is used to monitor the fire signal in the area where the frequency converter belongs if the fire control function of the frequency converter is enabled.

[0079] The control module 12 is used to control the frequency converter to enter the working state and ignore the overheat protection signal if a fire signal is obtained.

[0080] The analysis and adjustment module 13 is used to analyze the fire signal to determine the current fire severity in the area where the frequency converter is located, and adjust the operating frequency of the frequency converter according to the current fire severity.

[0081] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0082] The inverter control device provided in this embodiment corresponds to the method described above, and therefore has the same beneficial effects as the method described above.

[0083] From a hardware perspective, this embodiment provides a frequency converter. Figure 5 A structural diagram of a frequency converter provided in one embodiment of this application is shown below. Figure 5 As shown, the frequency converter includes: a memory 20 for storing computer programs;

[0084] The processor 21 is used to execute computer programs to implement the steps of the inverter control method mentioned in the above embodiments.

[0085] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0086] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the inverter control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, data involved in the inverter control method.

[0087] In some embodiments, the frequency converter may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0088] Those skilled in the art will understand that the structure shown in the figure does not constitute a limitation on the frequency converter and may include more or fewer components than shown.

[0089] The frequency converter provided in this application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the following method: a control method for the frequency converter.

[0090] The frequency converter provided in this embodiment corresponds to the method described above, and therefore has the same beneficial effects as the method described above.

[0091] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0092] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0093] The computer-readable storage medium provided in this embodiment corresponds to the method described above, and therefore has the same beneficial effects as the method described above.

[0094] The control method, apparatus, and frequency converter of this application have been described in detail above. The various embodiments in the 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 it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0095] 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 the aforementioned element.

Claims

1. A control method of a frequency converter, characterized by, The method comprises: confirming a fire mode of a frequency converter according to a received selection instruction; wherein the fire mode of the frequency converter comprises a first fire mode and a second fire mode; if a fire control function of the frequency converter is enabled, monitoring a fire signal of an area to which the frequency converter belongs; if the fire signal is acquired, controlling the frequency converter to enter a working state and ignoring control of an overheat protection signal; wherein if the frequency converter is in the first fire mode, the controlling the frequency converter to enter the working state and ignoring the control of the overheat protection signal if the fire signal is acquired comprises: controlling the frequency converter to enter the working state and ignoring control of any protection signal if the fire signal is acquired; if the frequency converter is in the second fire mode, the controlling the frequency converter to enter the working state and ignoring the control of the overheat protection signal if the fire signal is acquired comprises: controlling the frequency converter to enter the working state and ignoring control of any protection signal except overvoltage protection signals and overcurrent protection signals if the fire signal is acquired; analyzing the fire signal to determine a current fire degree of the area to which the frequency converter belongs, and adjusting a working frequency of the frequency converter according to the current fire degree.

2. The control method of the frequency converter according to claim 1, characterized in that, The adjusting the working frequency of the frequency converter according to the current fire degree comprises: determining a target working frequency of the frequency converter according to the current fire degree; acquiring a current working frequency of the frequency converter; if the current working frequency is higher than the target working frequency, reducing the working frequency of the frequency converter to the target working frequency; if the current working frequency is lower than the target working frequency, increasing the working frequency of the frequency converter to the target working frequency.

3. The control method of the frequency inverter according to claim 2, characterized by The frequency converter comprises a running input terminal and a frequency increasing input terminal, if a signal of the running input terminal is valid and a signal of the frequency increasing input terminal is invalid, the frequency converter works at a first preset frequency; if the signal of the running input terminal is valid and the signal of the frequency increasing input terminal is valid, the frequency converter works at a second preset frequency; if the signal of the running input terminal is invalid, the frequency converter stops; wherein the second preset frequency is greater than the first preset frequency. Correspondingly, the adjusting the working frequency of the frequency converter according to the current fire degree comprises: determining whether the current fire degree exceeds a preset level; wherein fire degrees are divided into multiple levels in advance, and a higher level represents a more serious fire; if not, sending a valid signal to the running input terminal to control the frequency converter to work at the first preset frequency; if yes, sending valid signals to the running input terminal and the frequency increasing input terminal to control the frequency converter to work at the second preset frequency.

4. The control method of the frequency inverter according to any one of claims 1 to 3, characterized by, The fire signal comprises a level signal and a pulse signal; if the fire signal is a level signal, the controlling the frequency converter to enter the working state and ignoring the control of the overheat protection signal if the fire signal is acquired comprises: controlling the frequency converter to enter the working state and ignoring the control of the overheat protection signal if the fire signal is acquired, and resuming a normal working mode after the fire signal is invalid. If the fire signal is a pulse signal, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal if the fire signal is acquired includes: If the fire signal is acquired, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal, and maintaining a current state after the fire signal is invalid.

5. The control method of the frequency inverter according to claim 4, characterized by, If the fire signal is a pulse signal, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal if the fire signal is acquired includes: If the fire signal is acquired, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal, and maintaining a current state after the fire signal is invalid. If the fire signal is a pulse signal, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal if the fire signal is acquired includes: If the fire signal is acquired, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal, and maintaining a current state after the fire signal is invalid.

6. The control method of the frequency inverter according to claim 4, characterized by, If the fire signal is a pulse signal, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal if the fire signal is acquired includes: If the fire signal is acquired, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal, and maintaining a current state after the fire signal is invalid. The fire signal is sent by a peripheral fire detection device; Correspondingly, if the fire signal is a pulse signal, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal if the fire signal is acquired includes: If the fire signal is acquired, a fire confirmation signal is sent to the peripheral fire detection device, and a feedback signal of the peripheral fire detection device is monitored; 7. The control method of the frequency inverter according to claim 1, characterized by, If the feedback signal of the peripheral fire detection device is not received within a second preset time period, the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal is performed; If the feedback signal of the peripheral fire detection device is received within the second preset time period, the control of controlling the frequency converter to operate in a normal working mode is performed. The controller for controlling the frequency converter is internally provided with a fire flag bit; 8. A control device of a frequency converter, characterized in that Correspondingly, after the control of controlling the frequency converter to enter a working state and ignoring an overheat protection signal if the fire signal is acquired, the control further includes: The fire flag bit is correspondingly set, and after the fire flag bit is set, it represents that the frequency converter has received the fire signal. It includes: A monitoring module is configured to monitor a fire signal of an area to which the frequency converter belongs if a fire control function of the frequency converter is enabled. The control module is configured to, if the fire signal is acquired, control the frequency converter to enter a working state and ignore control of the overheat protection signal; wherein, before the monitoring of the fire signal of the area to which the frequency converter belongs if the fire control function of the frequency converter is enabled, the method further comprises: confirming a fire mode of the frequency converter according to a received selection instruction; wherein, the fire mode of the frequency converter comprises a first fire mode and a second fire mode; if the frequency converter is in the first fire mode, the control of the frequency converter to enter the working state and ignore the control of the overheat protection signal if the fire signal is acquired comprises: controlling the frequency converter to enter the working state and ignore control of any protection signal if the fire signal is acquired; if the frequency converter is in the second fire mode, the control of the frequency converter to enter the working state and ignore the control of the overheat protection signal if the fire signal is acquired comprises: controlling the frequency converter to enter the working state and ignore control of any protection signal except the overvoltage protection signal and the overcurrent protection signal if the fire signal is acquired. The analysis and adjustment module is configured to analyze the fire signal to determine a current fire degree of the area to which the frequency converter belongs, and adjust a working frequency of the frequency converter according to the current fire degree.

9. A frequency converter, characterized in that The computer program is stored in the memory and comprises computer executable instructions for causing the processor to perform the steps of the method. The processor is configured to execute the computer program to implement the steps of the control method of the frequency converter according to any one of claims 1 to 7.

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