A frequency converter backup device and frequency conversion equipment

Abstract

The present application discloses a frequency converter backup device and frequency conversion equipment, which relates to the technical field of frequency converters and can improve the efficiency of frequency converter spare parts replacement. The frequency converter backup device includes: a main frequency converter; a backup frequency converter, which is connected to a plurality of main frequency converters of different powers; a switching switch, which is connected to the backup frequency converter, and which is used to control the backup frequency converter to switch and connect with a plurality of main frequency converters of different powers.

Description

Technical Field

[0001] The present application relates to the technical field of frequency converters, and in particular to a frequency converter backup device and a frequency converter equipment. Background Art

[0002] At present, with the continuous development of electrical automation technology and the demand for extreme energy consumption, the application of low-voltage inverters in industrial sites is increasing. Inverters can achieve the dual needs of soft start and precise speed regulation. However, the replacement efficiency of existing inverter spare parts is low and cannot meet the needs of rapid recovery of process production on site. Utility Model Content

[0003] The embodiments of the present application provide a frequency converter backup device and a frequency converter equipment, which can improve the efficiency of replacing frequency converter spare parts.

[0004] According to a first aspect of an embodiment of the present application, there is provided a frequency converter backup device, comprising:

[0005] Main inverter;

[0006] A standby frequency converter, the standby frequency converter being connected to a plurality of main frequency converters of different powers;

[0007] A switching switch is connected to the standby frequency converter, and is used to control the standby frequency converter to switch between the standby frequency converter and a plurality of main frequency converters of different powers.

[0008] In some implementations, the standby frequency converter is connected one-to-one with the main frequency converters of different powers.

[0009] In some embodiments, the main inverter includes a main inverter motor and a main inverter fan;

[0010] A plurality of main frequency converters of different powers are connected in parallel to form a frequency converter main circuit;

[0011] The standby frequency converter is connected to the main frequency converter to form a frequency converter switching circuit;

[0012] The standby frequency converter is connected between the main frequency conversion motor and the main frequency conversion fan.

[0013] In some embodiments, a plurality of main inverter motors of different powers are connected in parallel to form a main inverter motor loop;

[0014] A plurality of main inverter fans of different powers are connected in parallel to form a main inverter fan circuit;

[0015] The standby inverter is arranged between the fan circuit of the main inverter and the motor circuit of the main inverter.

[0016] In some embodiments, the backup inverter includes a backup inverter fan and a backup inverter motor;

[0017] The backup inverter motor and the main inverter motor circuit are connected in series;

[0018] The backup inverter fan and the main inverter fan circuit are connected in series.

[0019] In some embodiments, the frequency converter backup device further includes:

[0020] A main fuse, wherein the main fuse is respectively connected to the inverter main circuit and the inverter switching circuit, and the main fuse is used to supply power for switching of the inverter main circuit and the inverter switching circuit.

[0021] In some embodiments, the inverter switching circuit is provided with a first contactor, the first contactor is provided between the standby inverter and the main fuse, and the first contactor is used to control the start and stop of the standby inverter;

[0022] The inverter switching circuit is provided with a second contactor, the second contactor is arranged between the main fuse and the main inverter fan, and the second contactor is used to control the start and stop of the inverter fan.

[0023] In some embodiments, the inverter switching circuit is provided with a first isolating switch, the first isolating switch is provided between the standby inverter and the inverter motor, and the first isolating switch is used to control the start and stop of the inverter motor;

[0024] The inverter switching circuit is provided with a second isolating switch, the second isolating switch is arranged between the main fuse and the second contactor, and the second isolating switch is used to control the start and stop of the inverter fan.

[0025] In some embodiments, the inverter switching circuit is provided with a first reactor and a second reactor;

[0026] The first reactor is arranged between the main fuse and the standby frequency converter, and the first reactor is used to adjust the input voltage of the standby frequency converter;

[0027] The second reactor is disposed between the standby frequency converter and the first isolating switch, and the second reactor adjusts the output voltage of the standby frequency converter.

[0028] According to a first aspect of an embodiment of the present application, a frequency conversion device is provided, including:

[0029] The frequency converter backup device as described in the first aspect;

[0030] An electric control device, the electric control device being connected to the inverter backup device;

[0031] A control terminal is connected to the electronic control device.

[0032] The present application provides a frequency converter backup device and frequency converter equipment. By connecting the backup frequency converter to a plurality of main frequency converters with different powers, the backup frequency converter can be compatible with the switching power capacity of the main frequency converters with different powers. The switching switch is connected to the backup frequency converter, and the program switching function of the switching switch is utilized to make one backup frequency converter serve as a backup for a plurality of main frequency converters with different powers. In the event of a main frequency converter failure, the backup frequency converter can be switched with the failed main frequency converter, thereby reducing the cost of the main frequency converter spare parts and shortening the time for fault handling, thereby improving the efficiency of the replacement of frequency converter spare parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic electrical schematic diagram of a frequency converter backup device provided in an embodiment of the present application;

[0034] Figure 2 A schematic structural diagram of a frequency conversion device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0036] In this article, 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 that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0037] At present, with the continuous development of electrical automation technology and the demand for extreme energy consumption, the application of low-voltage inverters in industrial sites is increasing. Inverters can achieve the dual needs of soft start and precise speed regulation. However, the replacement efficiency of existing inverter spare parts is low and cannot meet the needs of rapid recovery of process production on site.

[0038] In view of this, an embodiment of the present application provides a frequency converter spare device and a control method, which can improve the efficiency of replacing frequency converter spare parts.

[0039] In a first aspect, an embodiment of the present application provides a frequency converter backup device. Figure 1 This is a schematic electrical schematic diagram of a frequency converter backup device provided in an embodiment of the present application. Figure 1 As shown, the inverter backup device includes a main inverter, a backup inverter 300 and a switch 400. The main inverter can be a plurality of main inverters of different powers, and the backup inverter 300 is connected to the plurality of main inverters of different powers. Wherein, each main inverter includes a main inverter motor 100 and a main inverter motor 200. The plurality of main inverters of different powers include a plurality of main inverter motors 100 of different powers and a plurality of main inverter fans 200 of different powers. The power capacity of a backup inverter 300 can be compatible with the power capacity of any one of the plurality of main inverters of different powers, that is, the power capacity of the backup inverter 300 is greater than the power capacity of the main inverter. A backup inverter 300 can complete the switching connection with a plurality of main inverters of different powers that need backup functions. The switch 400 is connected to the backup inverter 300, and the switching connection between the backup inverter 300 and the plurality of main inverters of different powers is controlled by the switch. By utilizing the switching function of the switching switch 400, one standby frequency converter 300 can be used as a standby for multiple main frequency converters with different powers. In the event of a failure in any one of the multiple main frequency converters with different powers, the main frequency converter with the failure can be used as the main frequency converter with the main standby function, and the program can be switched by the switching switch to switch the standby frequency converter 300 with the main frequency converter that needs the standby function. By controlling the switching switch, a fast switching connection between one standby frequency converter and multiple main frequency converters with different powers can be realized, thereby reducing the cost of main frequency converter spare parts, shortening the time for fault handling, and thus improving the efficiency of frequency converter spare parts replacement.

[0040] Usually, when a frequency converter is replaced with a spare part at an industrial operation site, a spare frequency converter can only be used as a spare part for the main frequency converter. This means that when the frequency converter is replaced with a spare part, all related equipment at the operation site needs to be stopped. The cost of replacing spare parts is high, and the time for troubleshooting is long, which cannot meet the process requirements for rapid resumption of production on site.

[0041] The present application provides a frequency converter backup device and frequency converter equipment. By connecting a backup frequency converter with a plurality of main frequency converters of different powers, the backup frequency converter can be compatible with the switching power capacity of the main frequency converters of different powers. The switching switch is connected to the backup frequency converter, and the switching function of the switching switch is utilized to make one backup frequency converter serve as a backup for the main frequency converters of different powers. In the event of a main frequency converter failure, one backup frequency converter can be switched and connected with the main frequency converters of different powers that have failed, thereby reducing the cost of the main frequency converter spare parts and shortening the time for fault handling, thereby improving the efficiency of the replacement of frequency converter spare parts.

[0042] In some implementations, the switch controls the standby frequency converter to switch connections with main frequency converters of different powers in a one-to-one manner.

[0043] For example, Figure 1 As shown, the inverter motor includes 1# motor, 2# motor, 3# motor...N# motor, and the main inverter fan includes 1# fan, 2# fan, 3# fan...M# fan. 1# motor and 1# fan form the first main inverter, 2# motor and 2# fan form the second main inverter, N# motor and M1# fan form the Nth main inverter, N represents the number of the main inverter motors of different powers, and N is a natural number greater than 0. M represents the number of the main inverter fans of different powers, and M is a natural number greater than 0. Among them, M is equal to N, and M and N can be a one-to-one correspondence. The motors and fans are connected one-to-one to form independently set main inverters, and the first main inverter and the second main inverter...Nth main inverter are set in parallel with each other. By switching the switch, the standby inverter 300 can be controlled to perform one-to-one switching connection with any one of the first to Nth main inverters, thereby realizing one-to-one switching connection between the standby inverter and main inverters of different powers, thereby improving the switching accuracy and efficiency between the standby inverter and the main inverter.

[0044] In some embodiments, Figure 1 As shown, the main inverter motors 100 and main inverter fans 200 of multiple main inverters with different powers are connected in parallel to form an inverter main circuit. The standby inverter is connected in parallel with the main inverter motors 100 and main inverter fans 200 of multiple main inverters with different powers to form an inverter switching circuit, and the standby inverter is connected between the main inverter motor 100 and the main inverter fan 200. The switching switch 400 controls the inverter switching circuit to switch between the inverter main circuits of multiple inverters with different powers, and can switch the inverter main circuit of the inverter that needs the standby function to the inverter switching circuit in a targeted manner, complete the spare parts operation of the standby inverter, and eliminate the fault of the main inverter. Reduce the cost of the main inverter spare parts, shorten the time of fault handling, and thus improve the efficiency of the inverter spare parts replacement.

[0045] In some embodiments, a plurality of main inverter motors 100 of different powers are connected in parallel to form a main inverter motor circuit, a plurality of main inverter fans 200 of different powers are connected in parallel to form a main inverter fan circuit, a standby inverter 300 is arranged between the main inverter fan circuit and the main inverter motor circuit, and a switching switch 400 controls the standby inverter to switch and connect with the main inverter fan circuit and the main inverter motor circuit. By controlling the switching switch, the standby inverter 300 is switched and connected with the main inverter motor and the main inverter fan in the main inverter fan circuit and the main inverter motor circuit that need a standby function, so that a fast switching connection between the standby inverter and the main inverter motor and the main inverter fan that need a standby function can be achieved, and the spare parts operation of the standby inverter can be completed efficiently, thereby improving the efficiency of the replacement of inverter spare parts.

[0046] In some embodiments, the standby inverter includes a standby inverter fan and a standby inverter motor, the standby inverter motor and the main inverter motor circuit are connected in series, and the standby inverter fan and the main inverter fan circuit are connected in series. The power capacity of the standby inverter motor can be compatible with the power capacity of multiple main inverter motors of different powers. The power capacity of the standby inverter fan can be compatible with the power capacity of multiple main inverter fans of different powers. The standby inverter motor is controlled by a switching switch to be switched one-to-one with the main inverter motor, and the standby inverter fan is controlled by a switching switch to be switched one-to-one with the main inverter fan. The standby inverter motor and the standby inverter fan are respectively switched one-to-one with the main inverter motor and the main inverter fan, which avoids switching errors during the switching process, improves the accuracy of the switching connection between the standby inverter and the main inverters of different powers, and reduces the time for fault handling.

[0047] Exemplarily, the switching switch 400 is provided with an intelligent input module 600, and the switching switch 400 is provided with an electrical connection with the intelligent input module 600. By inputting a program segment for controlling the standby inverter to switch with a plurality of main inverters of different powers into the intelligent input module, the standby inverter 300 is controlled to switch and connect with a plurality of main inverters of different powers through the program switching function of the switching switch, so that the standby inverter can be switched and connected with the main inverters of different powers one by one, thereby improving the efficiency of switching and connecting the standby inverter with the main inverter.

[0048] Exemplarily, there are multiple switching switches 400, which can be A1, A2, A3...AN. There are multiple program segments, which can be B1, B2, B3...BN. The program segments output by the intelligent output module 600 correspond one-to-one to the switches of the switch 400 to be switched. The program segment B1 of the intelligent input module 600 corresponds to the switch A1 of the switching switch 400 for program switching, the B2 of the intelligent input module 600 corresponds to the switch A2 of the switching switch 400 for program switching, the B3 of the intelligent input module 600 corresponds to the switch A3 of the switching switch 400 for program switching, and the BN of the intelligent input module 600 corresponds to the switch AN of the switching switch 400 for program switching. When the program segment B1 is output to the intelligent input module, A1 of the switching switch is closed, the inverter switching circuit is put into use, and the inverter switching circuit replaces the inverter main circuit for on-site work, realizing the operation of the standby inverter 300 replacing the first main inverter. When the program segment B2 is output to the intelligent input module, A2 of the switching switch is closed, the inverter switching circuit is put into use, and the inverter switching circuit replaces the inverter main circuit for on-site work, realizing the operation of replacing two main inverters with one standby inverter. When the program segment BN is output to the intelligent input module, AN of the switching switch is closed, the inverter switching circuit is put into use, and the inverter switching circuit replaces the inverter main circuit for on-site work, realizing the operation of replacing N main inverters with one standby inverter. The switching switch can be used to control the replacement operation of 1 to N main inverters by the standby inverter, realize the rapid switching between a standby inverter and multiple main inverters with different powers, and improve the efficiency of inverter spare parts replacement.

[0049] In some embodiments, the inverter backup device also includes a main fuse 500, one end of which is respectively connected to the inverter main circuit and the inverter switching circuit, and the other end of the main fuse 500 is connected to the main power supply 700, which is a three-phase power supply. By controlling the closing of the main fuse 500, the total power supply 700 supplies power to the main inverter motors 100 and the main inverter fans 200 of multiple main inverters with different powers in parallel to form the inverter main circuit. By controlling the closing of the main fuse 500, the total power supply 700 supplies power to the standby inverter and the main inverter motors 100 and the main inverter fans 200 of multiple main inverters with different powers in parallel to form the inverter switching circuit. By controlling the closing of the main fuse 500, the same electric power is input to the switching input of the inverter main circuit and the inverter switching circuit, which can ensure that the power supply power of the inverter switching circuit after the switching is completed is the same as the power of the main inverter main circuit, so that the inverter switching circuit can resume process production more quickly.

[0050] In some embodiments, Figure 1As shown, the inverter switching circuit is provided with a first contactor 510, which is arranged between the standby inverter 300 and the main fuse 500, and the first contactor 510 can control the start and stop of the standby inverter. The inverter switching circuit is provided with a second contactor 520, which is arranged between the main fuse 500 and the main inverter fan 200, and the second contactor can control the start and stop of the inverter fan. There are multiple second contactors 520, which can be K1, K2, K3...KN. The second contactor 520 with the same power as the main inverter fan that needs the standby function can be controlled to close according to the main inverter fan that actually needs the standby function. When the main fuse 500, the first contactor 510 and the second contactor 520 are closed at the same time, the inverter switching circuit can be powered. The main fuse 500 can power the total circuit composed of the inverter switching circuit and the inverter main circuit. The first contactor only powers the standby inverter 300, and the second contactor only powers the main inverter motor fan 200. Through the setting of the first contactor 510 and the second contactor 520, selective power supply to the standby inverter and the inverter fan can be achieved, saving electric energy while meeting the fast switching of the inverter standby function.

[0051] In some embodiments, Figure 1As shown, the inverter switching circuit is provided with a first isolating switch 530, and the first isolating switch 530 is provided between the standby inverter 300 and the inverter motor 100. The first isolating switch 530 can control the start and stop of the inverter motor 100. The first isolating switch 530 includes Q1, Q2, Q3...QN. The first isolating switch 530 includes a second isolating switch 540 provided in the inverter switching circuit, and the second isolating switch 540 is provided between the main fuse 500 and the second contactor 520. There are multiple second isolating switches 540, which can be S1, S2, S3...SN respectively. The second isolating switch 540 can be used to control the start and stop of the main inverter fan 200. When the program segment B1 is output to the intelligent input module, the A1 of the switching switch is closed, the main fuse 500, the first contactor 510, Q1, K1 and S1 are all closed, the inverter switching circuit is put into use, and the inverter switching circuit replaces the inverter main circuit to work, and a standby inverter replaces the first main inverter that needs a standby function. When the program segment B2 is output to the intelligent input module, the A2 of the switching switch is closed, the main fuse 500, the first contactor 510, Q2, S2, K2 are all closed, the inverter switching circuit is put into use, and the inverter switching circuit replaces the inverter main circuit to work, and a standby inverter 300 replaces the second main inverter. When the program segment B3 is output to the intelligent input module, the A3 of the switching switch is closed, the main fuse 500, the first contactor 510, the Q3, S3 isolation switches, and the K3 contactor are all closed, the inverter switching circuit is put into use, and the inverter switching circuit replaces the inverter main circuit to work, and a standby inverter 300 replaces the third main inverter. When the program segment BN is output to the intelligent input module, the AN of the switching switch is closed, the main fuse 500, the first contactor 510, QN, SN, and KN are all closed, the inverter switching circuit is put into use, and the inverter switching circuit replaces the inverter main circuit to work, and a standby inverter 300 replaces the Nth main inverter. The switch can be used to control the replacement operation of the standby inverter for 1 to N main inverters, realize the rapid switching between a standby inverter and N main inverters with different powers, and improve the efficiency of inverter spare parts replacement.

[0052] In some embodiments, Figure 1As shown, the inverter switching circuit is provided with a first reactor 310 and a second reactor 320. The first reactor is arranged between the main fuse 500 and the standby inverter 300, and the first reactor 310 can adjust the input voltage of the standby inverter 300. The second reactor 320 is arranged between the standby inverter 300 and the first isolating switch 530, and the second reactor 320 can adjust the output voltage of the standby inverter 300. The first reactor 310 allows the voltage input to the standby inverter 300 to maintain a stable input, improve the power stability of the standby inverter, and improve the stability of the standby inverter itself. The second reactor 320 is arranged to allow the voltage output from the standby inverter 300 to be output stably, ensure the stability of the power during the switching connection between the standby inverter and the main inverter, improve the stability of the inverter switching circuit when it is put into use, and thus reduce the risk of failure of the switching circuit.

[0053] In a second aspect, an embodiment of the present application provides a frequency conversion device, Figure 2 This is a schematic structural diagram of a frequency conversion device provided in an embodiment of the present application. Figure 2 As shown, the frequency conversion device includes the frequency converter backup device 1000, the electric control device 2000, and the control terminal 3000 as in the first aspect. The electric control device 2000 is electrically connected to the frequency converter backup device 1000, and the control terminal 3000 is electrically connected to the electric control device 2000. The control terminal is used to send a fault signal to the electric control device 2000, and the electric control device 2000 determines the number of the main frequency converter that needs the spare function according to the received fault signal. The electric control device 2000 inputs the fault number information into the intelligent input module of the frequency converter backup device 1000, generates a program segment for switching between the standby frequency converter and the main frequency converter that needs the spare function, and then controls the switching switch that matches the program segment to execute the switching connection between the standby frequency converter and the main frequency converter that needs the spare function. The control terminal can send a fault signal to the electric control device 2000, and can also receive the working status information of the frequency converter backup device after the switching connection transmitted by the electric control device, monitor the working status of the frequency converter in real time, and promptly eliminate the fault when it occurs, thereby improving the working efficiency of the frequency conversion device.

[0054] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0055] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0056] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0057] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0058] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A frequency converter backup device, characterized in that: include: Main inverter; A standby frequency converter, the standby frequency converter being connected to a plurality of main frequency converters of different powers; A switching switch is connected to the standby frequency converter, and is used to control the standby frequency converter to switch between the standby frequency converter and a plurality of main frequency converters of different powers.

2. The inverter backup device according to claim 1, characterized in that: The standby frequency converter is connected one-to-one with the main frequency converters of different powers.

3. The inverter backup device according to claim 2, characterized in that: The main frequency converter includes a main frequency converter motor and a main frequency converter fan; A plurality of main frequency converters of different powers are connected in parallel to form a frequency converter main circuit; The standby frequency converter is connected to the main frequency converter to form a frequency converter switching circuit; The standby frequency converter is connected between the main frequency converter motor and the main frequency converter fan.

4. The inverter backup device according to claim 3, characterized in that: A plurality of main inverter motors of different powers are connected in parallel to form a main inverter motor circuit; A plurality of main inverter fans of different powers are connected in parallel to form a main inverter fan circuit; The standby inverter is arranged between the fan circuit of the main inverter and the motor circuit of the main inverter.

5. The inverter backup device according to claim 4, characterized in that: The standby frequency converter includes a standby frequency converter fan and a standby frequency converter motor; The backup inverter motor and the main inverter motor circuit are connected in series; The backup inverter fan and the main inverter fan circuit are connected in series.

6. The frequency converter backup device according to claim 5, characterized in that: Also includes: A main fuse, wherein the main fuse is respectively connected to the inverter main circuit and the inverter switching circuit, and the main fuse is used to supply power for switching of the inverter main circuit and the inverter switching circuit.

7. The inverter backup device according to claim 6, characterized in that: The inverter switching circuit is provided with a first contactor, the first contactor is arranged between the standby inverter and the main fuse, and the first contactor is used to control the start and stop of the standby inverter; The inverter switching circuit is provided with a second contactor, the second contactor is arranged between the main fuse and the main inverter fan, and the second contactor is used to control the start and stop of the inverter fan.

8. The inverter backup device according to claim 7, characterized in that: The inverter switching circuit is provided with a first isolating switch, the first isolating switch is arranged between the standby inverter and the inverter motor, and the first isolating switch is used to control the start and stop of the inverter motor; The inverter switching circuit is provided with a second isolating switch, the second isolating switch is arranged between the main fuse and the second contactor, and the second isolating switch is used to control the start and stop of the inverter fan.

9. The frequency converter backup device according to claim 8, characterized in that: The frequency converter switching circuit is provided with a first reactor and a second reactor; The first reactor is arranged between the main fuse and the standby frequency converter, and the first reactor is used to adjust the input voltage of the standby frequency converter; The second reactor is disposed between the standby frequency converter and the first isolating switch, and the second reactor adjusts the output voltage of the standby frequency converter.

10. A frequency conversion device, characterized in that: include: The frequency converter backup device according to any one of claims 1 to 9; An electric control device, the electric control device being connected to the inverter backup device; A control terminal is connected to the electronic control device.

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