Frequency converter and control method and device thereof, storage medium and computer program product

Abstract

The invention discloses a frequency converter and a control method and device thereof, a storage medium and a computer program product. The method comprises the following steps: acquiring a fault feedback signal detected by a driving module of the frequency converter; determining whether the level of the fault feedback signal is a set first level; if it is determined that the level of the fault feedback signal is a set first level, stopping outputting a driving control signal to the driving module, so that the frequency converter is shut down; then, a driving reset signal is sent out through software and the driving module is controlled to reset, or the driving reset signal is sent out according to the duration of the fault feedback signal and the driving module is controlled to reset; and after the driving module is controlled to be reset, the frequency converter is controlled to be restarted. According to the scheme, the drive board is controlled to reset through software after the drive fault of the frequency converter occurs, or the drive board is automatically controlled to reset after the drive fault lasts for a short time, so that quick reset can be realized without power failure, and the operation is simple, convenient, time-saving and labor-saving.

Description

Technical Field

[0001] The present invention belongs to the technical field of frequency converters, and specifically relates to a control method, device, frequency converter, storage medium and computer program product of a frequency converter, and more particularly to a method, device, frequency converter, storage medium and computer program product for quickly resetting a frequency converter after a drive fault. Background Art

[0002] The main function of the inverter part in the frequency converter is to convert direct current into three-phase alternating current of the required frequency and voltage. The insulated gate bipolar transistor (IGBT) is a common power module in the inverter part. IGBT is usually used with a driver board. The main control part of the frequency converter outputs a pulse width modulation (PWM) drive signal to the driver board. After processing by the driver board, the IGBT module is driven to work normally. In addition, the driver board can also monitor the fault condition of the IGBT module in the inverter part and transmit the fault feedback signal FLT to the main control part.

[0003] In actual applications, after the driver board detects a fault during operation, it will output a continuous low level to the main control part until the driver board is powered off. After receiving the fault feedback signal FLT, the main control part controls the inverter to stop due to the fault. If you want to clear the drive fault and restart the inverter, you need to manually power off after the fault shutdown and then power on again to reset the driver chip of the driver board to restore the initial state. However, this processing method requires manual power off, which is more troublesome.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The object of the present invention is to provide a control method, device, inverter, storage medium and computer program product for a frequency converter, so as to solve the problem that after the frequency converter stops due to a drive failure, it is necessary to manually cut off the power and then restart it, which is at least cumbersome to operate. By controlling the driver board to reset through software after the frequency converter drive failure, or automatically controlling the driver board to reset after the drive failure continues for a short time, it can be achieved that the power can be quickly reset without cutting off the power, which is simple to operate and saves time and effort.

[0006] The present invention provides a control method for a frequency converter, wherein the frequency converter comprises an inverter, wherein the inverter comprises a power module and a driving module of the power module; the driving module is capable of detecting whether the power module has a driving fault and obtaining a fault feedback signal; when the driving module detects that the driving module has a driving fault, the level of the fault feedback signal is a set first level, and the driving module stops outputting a driving signal to the power module; when the driving module detects that the driving module has no driving fault, the level of the fault feedback signal is a set second level; the control method for the frequency converter comprises: obtaining the fault feedback signal detected by the driving module; determining whether the level of the fault feedback signal is a set first level; if it is determined that the level of the fault feedback signal is the set first level, stopping outputting a driving control signal to the driving module to stop the frequency converter; thereafter, issuing a driving reset signal through software and controlling the driving module to reset, or issuing a driving reset signal according to the duration of the fault feedback signal and controlling the driving module to reset; after controlling the driving module to reset, controlling the frequency converter to restart.

[0007] In some embodiments, a control module is provided at the front end of the driving module; wherein the control module is used to perform voltage stabilization and filtering processing on the driving reset signal based on the driving reset signal issued by software, or the driving reset signal issued according to the duration of the fault feedback signal, and then output it to the driving module to control the reset of the driving module.

[0008] In some embodiments, the control module includes: a first resistor module, a second resistor module, a third resistor module, a switch tube module, and a capacitor module; wherein the drive reset signal is input to the control end of the switch tube module after passing through the first resistor module; the control end of the switch tube module is grounded after passing through the second resistor module; a preset DC power supply is connected to the first connection end of the switch tube module after passing through the third resistor module; the first connection end of the switch tube module is grounded after passing through the capacitor module; the first connection end of the switch tube module is connected to the reset end of the drive module; and the second connection end of the switch tube module is grounded.

[0009] In some embodiments, issuing a drive reset signal through software and controlling the driver module to reset includes: issuing a drive reset signal through software after stopping outputting the drive control signal to the driver module for a set period of time; if it is determined that the level of the drive reset signal issued by the software maintains a set first level for a set first time, controlling the driver module to reset; wherein the set first time is greater than the set minimum reset time of the driver module.

[0010] In some embodiments, a drive reset signal is issued and the drive module is controlled to reset according to the duration of the fault feedback signal, including: issuing a drive reset signal after the drive module stops outputting the drive signal to the power module; if it is determined that the level of the issued drive reset signal maintains a set first level for a set second time, controlling the drive module to reset; wherein the set second time is greater than the set first time.

[0011] In some embodiments, controlling the inverter to restart includes: in the event that a driving fault occurs in the driving module, determining whether the type of the driving fault occurring in the driving module belongs to a pre-set type of fault that allows restart; if it is determined that the type of the driving fault occurring in the driving module belongs to a pre-set type of fault that allows restart, then after a third time set by the driving module reset, outputting a driving control signal to the driving module, so that the driving module outputs a driving signal to the power module based on the driving control signal, so as to restart the power module and realize restart control of the inverter; wherein the set third time is less than the set minimum reset time of the driving module.

[0012] Matching the above method, the present invention provides a control device for a frequency converter on the other hand, wherein the frequency converter has an inverter, the inverter has a power module, and a drive module of the power module; the drive module can detect whether the power module has a driving fault and obtain a fault feedback signal; when the drive module detects that the drive module has a driving fault, the level of the fault feedback signal is a set first level, and the drive module stops outputting the driving signal to the power module; when the drive module detects that the drive module has no driving fault, the level of the fault feedback signal is a set second level; the control device for the frequency converter , including: an acquisition unit, configured to acquire the fault feedback signal detected by the driving module; a control unit, configured to determine whether the level of the fault feedback signal is a set first level; the control unit is also configured to stop outputting the drive control signal to the driving module if it is determined that the level of the fault feedback signal is the set first level, so as to shut down the inverter; thereafter, a drive reset signal is issued through software and the driving module is controlled to reset, or a drive reset signal is issued according to the duration of the fault feedback signal and the driving module is controlled to reset; the control unit is also configured to control the inverter to restart after controlling the driving module to reset.

[0013] In some embodiments, a control module is provided at the front end of the driving module; wherein the control module is used to perform voltage stabilization and filtering processing on the driving reset signal based on the driving reset signal issued by software, or the driving reset signal issued according to the duration of the fault feedback signal, and then output it to the driving module to control the reset of the driving module.

[0014] In some embodiments, the control module includes: a first resistor module, a second resistor module, a third resistor module, a switch tube module, and a capacitor module; wherein the drive reset signal is input to the control end of the switch tube module after passing through the first resistor module; the control end of the switch tube module is grounded after passing through the second resistor module; a preset DC power supply is connected to the first connection end of the switch tube module after passing through the third resistor module; the first connection end of the switch tube module is grounded after passing through the capacitor module; the first connection end of the switch tube module is connected to the reset end of the drive module; and the second connection end of the switch tube module is grounded.

[0015] In some embodiments, the control unit sends a drive reset signal and controls the reset of the drive module through software, including: after stopping outputting the drive control signal to the drive module for a set period of time, sending a drive reset signal through software; if it is determined that the level of the drive reset signal sent through the software remains at a set first level for a set first time, controlling the reset of the drive module; wherein the set first time is greater than the set minimum reset time of the drive module.

[0016] In some embodiments, the control unit sends a drive reset signal and controls the drive module to reset according to the duration of the fault feedback signal, including: sending a drive reset signal after the drive module stops outputting the drive signal to the power module; if it is determined that the level of the sent drive reset signal remains at a set first level for a set second time, controlling the drive module to reset; wherein the set second time is greater than the set first time.

[0017] In some embodiments, the control unit controls the inverter to restart, including: in the event that a driving fault occurs in the driving module, determining whether the type of the driving fault occurring in the driving module belongs to a pre-set fault type that allows restart; if it is determined that the type of the driving fault occurring in the driving module belongs to a pre-set fault type that allows restart, then after a third time set by the driving module reset, outputting a driving control signal to the driving module, so that the driving module outputs a driving signal to the power module based on the driving control signal, so as to restart the power module and realize restart control of the inverter; wherein the set third time is less than the set minimum reset time of the driving module.

[0018] Matching the above device, the present invention further provides a frequency converter, including: the control device of the frequency converter described above.

[0019] In accordance with the above method, the present invention provides a storage medium on another aspect, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the inverter control method described above.

[0020] Matching the above method, the present invention further provides a computer program product on the other hand, including a computer program, which implements the steps of the above inverter control method when executed by a processor.

[0021] Therefore, the scheme of the present invention is aimed at the main control part of the frequency converter (such as the main chip), the power module (such as the IGBT module) in the inverter, and the driving board (such as the IGBT driving board) of the power module (such as the IGBT module); when the IGBT driving board detects a driving fault of the IGBT module, the IGBT driving board feeds back the driving fault signal (such as the fault feedback signal FLT) of the IGBT module to the main chip, and the main chip sends a reset signal DSP-RST through software to control the resetting of the IGBT driving board, or automatically sends a reset signal DSP-RST to control the resetting of the IGBT driving board after the fault feedback signal FLT continues for a short time; thereby, by controlling the reset of the driving board through software after the driving fault of the frequency converter, or automatically controlling the reset of the driving board after the driving fault continues for a short time, quick reset can be achieved without powering off, which is simple to operate and saves time and effort.

[0022] Among them, the scheme of the present invention is to set a driving reset signal control circuit in the main control part, and the driving reset signal control circuit is set between the reset signal DSP-RST output end of the main chip and the receiving end of the driving reset signal RST of the IGBT driving board to stabilize the driving reset signal RST; when the IGBT driving board detects a driving fault of the IGBT module, the IGBT driving board feeds back the driving fault signal (such as the fault feedback signal FLT) of the IGBT module to the main chip, and the main chip sends a reset signal DSP-RST through the software to control the IGBT driving board to reset through the driving reset signal control circuit, or automatically sends a reset signal DSP-RST after the fault feedback signal FLT lasts for a short time to realize the reset of the IGBT driving board through the driving reset signal control circuit; thereby, by controlling the driver board to reset through the software after the inverter driving fault, or automatically controlling the driver board to reset after the driving fault lasts for a short time, quick reset can be achieved without power off, which is simple to operate and saves time and effort.

[0023] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flow chart of an embodiment of a method for controlling a frequency converter of the present invention;

[0026] Figure 2 A schematic flow chart of an embodiment of the method of the present invention in which a driver reset signal is sent out through software and the driver module is controlled to reset;

[0027] Figure 3 A flow chart of an embodiment of the method of the present invention for sending a drive reset signal according to the duration of the fault feedback signal and controlling the reset of the drive module;

[0028] Figure 4 A flow chart of an embodiment of controlling the inverter to restart in the method of the present invention;

[0029] Figure 5 It is a structural schematic diagram of an embodiment of a control device for a frequency converter of the present invention;

[0030] Figure 6 It is a structural diagram of the drive control and drive feedback device of the frequency converter;

[0031] Figure 7 It is a schematic diagram of the structure of the driving reset signal control circuit;

[0032] Figure 8 This is a schematic diagram of the signal waveform when the software controls the reset;

[0033] Fig. 9 It is a schematic diagram of the signal waveform during automatic reset;

[0034] Fig.10 The figure is a flowchart of a method for quickly resetting a frequency converter after a drive failure.

[0035] In conjunction with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0036] 102 - acquisition unit; 104 - control unit. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only 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 making creative work are within the scope of protection of the present invention.

[0038] Considering that the inverter needs to be manually powered off and then powered on again after a fault stops, the operation is at least cumbersome. In addition, it takes a certain amount of time to manually power off and then power on again, which will incur a great time cost in the false alarm or prototype test verification stage.

[0039] Therefore, the scheme of the present invention proposes a control method of a frequency converter, specifically a method for quickly resetting the frequency converter after a driving fault. After the driving board of the frequency converter feedbacks the driving fault, the driving board can be reset by software control, and the driving board can be quickly reset to start working after the driving board feedbacks the driving fault; it can also be realized that after the fault feedback signal FLT lasts for a short time, without any instructions and actions, automatic and rapid reset after the driving fault is realized. In this way, it can be quickly reset without power off, and can be quickly started when restarting is needed, without manual operation and saving time and labor.

[0040] According to an embodiment of the present invention, a control method for a frequency converter is provided. Figure 1A flow chart of an embodiment of the method of the present invention is shown. The frequency converter has an inverter, and the inverter has a power module (such as an IGBT module) and a driving module (such as an IGBT driving board) of the power module; the driving module can detect whether the power module has a driving fault and obtain a fault feedback signal; when the driving module detects that the driving module has a driving fault, the level of the fault feedback signal is a set first level (such as a low level), and the driving module stops outputting the driving signal to the power module; when the driving module detects that the driving module has not a driving fault, the level of the fault feedback signal is a set second level (such as a high level); in the scheme of the present invention, Figure 1 As shown, the control method of the frequency converter includes: steps S110 to S140.

[0041] In step S110, the fault feedback signal detected by the driving module is obtained.

[0042] In step S120, it is determined whether the level of the fault feedback signal is a set first level.

[0043] At step S130, if it is determined that the level of the fault feedback signal is the set first level, the drive control signal is stopped from being output to the drive module, so as to further cause the drive module to stop outputting the drive signal to the power module, so as to shut down the inverter; thereafter, a drive reset signal is sent through software and the drive module is controlled to reset, or a drive reset signal is sent according to the duration of the fault feedback signal and the drive module is controlled to reset; of course, if it is determined that the level of the fault feedback signal is not the set first level, the current state of the drive module is maintained.

[0044] In step S140, after controlling the driving module to reset, the inverter is controlled to restart.

[0045] Figure 6 The figure is a schematic diagram of the drive control and drive feedback device of the inverter. Figure 6 As shown in the figure, the drive control and drive feedback device of the frequency converter mainly includes the main control part, the IGBT drive board and the IGBT module. The main control part is mainly responsible for outputting the drive control signal PWM and processing the drive signal DRIVE; the IGBT drive board processes the drive control signal PWM of the main control part and then outputs the drive signal DRIVE to the IGBT module, synchronously performs fault inspection on the IGBT module, and transmits the fault feedback signal FLT to the main control part.

[0046] exist Figure 6In the example shown, the main control part is mainly responsible for outputting the drive control signal PWM and the drive reset signal RST, as well as receiving the fault feedback signal FLT fed back by the IGBT driver board. The drive reset signal RST is normally output at a high level, and when reset is required, the drive reset signal RST is output at a low level. The IGBT module starts working after receiving the drive signal DRIVE output by the IGBT driver board. The IGBT driver board is an important "bridge" between the main control part and the IGBT. The IGBT driver board processes the control signal PWM output by the main control part, outputs the drive signal DRIVE to the IGBT module, and detects the IGBT module in real time during the operation of the unit. When the unit is operating normally, the fault feedback signal FLT output by the IGBT driver board to the main control part is a high level. Once a fault is detected, the fault feedback signal FLT is output at a low level.

[0047] The solution of the present invention proposes a solution for fast resetting after a frequency converter driving fault. After the driving board of the frequency converter feedbacks the driving fault, the driving board can be reset by software control, so that the driving board can be quickly reset and start working; it can also automatically and quickly reset after the driving fault without any instructions and actions after the fault feedback signal FLT lasts for a short time. Thus, fast resetting can be achieved without power off, and it can be quickly started when restarting is needed, without manual operation and saving time and labor.

[0048] Compared with the related schemes that require manual power off and then power on to complete the drive reset, the scheme of the present invention can achieve rapid reset when the drive fails without any instructions and actions, solving the problem that the related schemes require manual power off and then power on to complete the drive reset. In the scheme of the present invention, the output reset signal can be controlled by software to achieve rapid reset when the drive fails; thus, rapid reset can be achieved without power off, and the inverter can be quickly started when it needs to be restarted, solving the problem that the related schemes cannot meet the requirements of rapid reset after drive failure to enable the drive to quickly resume work.

[0049] In some embodiments, a control module is provided at the front end of the driving module, such as Figure 7 The driving reset signal control circuit shown.

[0050] Among them, the control module is used to perform voltage stabilization and filtering processing on the drive reset signal based on the drive reset signal issued by software, or the drive reset signal issued according to the duration of the fault feedback signal, and then output it to the drive module to control the reset of the drive module.

[0051] Figure 7 Figure 1 is a schematic diagram of the structure of the driving reset signal control circuit. Figure 7 The driving reset signal control circuit shown is set in Figure 6 In the main control part shown, in order to ensure that the driving reset signal RST is a stable high level or low level, the reliability of the reset control of the IGBT driving board is improved.

[0052] In some embodiments, the control module includes: a first resistance module (such as resistor R1), a second resistance module (such as resistor R2), a third resistance module (such as resistor R3), a switch tube module (such as transistor Q1), and a capacitor module (such as capacitor C1).

[0053] Wherein, the driving reset signal is input to the control end of the switch tube module (such as the base of the transistor Q1) after passing through the first resistor module; the control end of the switch tube module (such as the base of the transistor Q1) is grounded after passing through the second resistor module. A preset DC power supply (such as a +5V power supply) is connected to the first connection end of the switch tube module (such as the collector of the transistor Q1) after passing through the third resistor module; the first connection end of the switch tube module (such as the collector of the transistor Q1) is grounded after passing through the capacitor module; the first connection end of the switch tube module (such as the collector of the transistor Q1) is connected to the reset end of the driving module. The second connection end of the switch tube module (such as the emitter of the transistor Q1) is grounded.

[0054] like Figure 7 The driving reset signal control circuit shown includes: resistor R1, resistor R2, resistor R3, capacitor C1, transistor Q1. The reset signal DSP-RST output by the main control chip (such as DSP chip) in the main control part is input to the base of the transistor Q1 after passing through the resistor R1; the base of the transistor Q1 is grounded after passing through the resistor R2; the +5V power supply is connected to the collector of the transistor Q1 after passing through the resistor R3; the emitter of the transistor Q1 is grounded; the emitter of the transistor Q1 is grounded after passing through the capacitor C1; the common end of the emitter of the transistor Q1, the resistor R3 and the capacitor C1 outputs the driving reset signal RST to the IGBT driving board.

[0055] exist Figure 7 In the example shown, resistors R1, R2 and R3 are matching resistors, and capacitor C1 is a filter capacitor. The DSP-RST signal is a reset signal output by the main control processor (such as a DSP chip). The reset signal DSP-RST is normally at a low level. At this time, transistor Q1 is not turned on, and the reset signal RST is pulled up to +5V to output a high level to the IGBT driver board. When it is necessary to restart the machine, that is, when the driver needs to reset, the reset signal DSP-RST is output at a high level, transistor Q1 is turned on, and the reset signal RST is driven to output a low level to the IGBT driver board. The IGBT driver board detects that the low level duration of the reset signal RST reaches Td and performs a reset action to restore the initial default state, and the fault is cleared.

[0056] In the solution of the present invention, it is provided as follows Figure 7 The driving reset signal control circuit indicated in, but not limited to Figure 7 The circuit shown.

[0057] In the scheme of the present invention, through the scheme of rapid resetting after the inverter drive fault, when the inverter needs to be restarted after the drive fault occurs, the drive fault can be quickly reset through software control to achieve fault clearing, and the drive can be restored to the initial state without power off, and the inverter can be quickly started when it needs to be restarted. The scheme of the present invention can achieve that after the inverter drive fault occurs, the drive board completes automatic fault reset and restores the initial state, and the drive fault reset can be completed without power off and human intervention, and the inverter can be quickly started when it needs to be restarted.

[0058] In some implementations, the specific process of sending a driver reset signal and controlling the driver module to reset by software in step S130 is described in the following exemplary embodiments.

[0059] Combine the following Figure 2 The flowchart of an embodiment of the method of the present invention in which a driving reset signal is sent through software and the driving module is controlled to reset is shown, further illustrating the specific process of sending a driving reset signal through software and controlling the driving module to reset in step S130, including: step S210 to step S220.

[0060] Step S210: After stopping outputting the driving control signal to the driving module for a set time, sending a driving reset signal through software.

[0061] Step S220, if it is determined that the level of the driving reset signal issued by the software maintains the set first level for a set first time, the driving module is controlled to reset; wherein the set first time is greater than the set minimum reset time of the driving module, the set time length is such as the time from t1 to t2, the set first time is such as time t, and the set minimum reset time of the driving module is such as the minimum reset time T-RST of the IGBT driving board.

[0062] Figure 8 This is a schematic diagram of the signal waveform when the software controls the reset. Figure 8 The waveforms in correspond to the drive control signal PWM and the drive reset signal RST output by the main control part, the drive signal DRIVE output by the IGBT drive board and the fault feedback signal FLT given to the main control part, and the time t is the low level duration of the drive reset signal RST. Fig. 9 Schematic diagram of signal waveform during automatic reset, wherein time Td represents the low level duration of the drive fault feedback signal FLT. Fig.10It is a flow chart of a method for quickly resetting the inverter after a drive fault. If a drive fault occurs and the main control part outputs a drive reset signal RST, the fault feedback signal FLT will return to a high level; if a drive fault occurs but the main control part does not output a drive reset signal RST, the fault feedback signal FLT will return to a high level after a duration of Td.

[0063] In the solution of the present invention, the process of quickly resetting the inverter after a drive failure is as follows: Fig.10 As shown, the waveforms of each signal in the initial state are as follows Figure 8 and Fig. 9 As shown, before time t0, Figure 8 and Fig. 9 They are signal waveform diagrams of software-controlled reset and automatic reset in the solution of the present invention, respectively. The waveforms from top to bottom correspond to the drive control signal PWM output by the main control part, the drive signal DRIVE output by the IGBT driver board, the drive reset signal RST output by the main control part, and the fault feedback signal FLT given to the main control part by the IGBT driver board. In the initial default state, the drive reset signal RST and the fault feedback signal FLT are high level, and continue to maintain a high level during the normal operation of the inverter. At t0, the IGBT driver board detects that a fault has occurred in the inverter drive, synchronously stops the output of the drive signal DRIVE, and outputs the fault feedback signal FLT as a low level. After receiving the fault feedback signal FLT, the main control part stops outputting the drive control signal PWM at t1. Among them, t1 is the next moment relative to t0 in a cycle.

[0064] exist Figure 8 , Fig. 9 and Fig.10 In the example shown, if the software in the main control part controls the reset, the main control part software controls the output of a low level with a time of t at time t2. When the low level duration t is greater than the minimum reset time T-RST of the IGBT driver board, the IGBT driver board is reset to the initial state at time t3, and the fault feedback signal FLT is restored to a high level, completing the drive reset. After the main control part receives the drive fault feedback signal FLT as a high level, it restarts at time t4, the main control part outputs the drive control signal PWM, and the IGBT module also starts to work normally. Among them, the time t is 20ms to 50ms. In the scheme of the present invention, the main control part software controls the reset, so that after a drive fault occurs, the software can quickly complete the drive reset and re-complete the inverter startup, which solves the problem that the related scheme cannot meet the requirements of fast reset after the drive fault and fast drive recovery work, and saves the time required to power off and wait for the inverter to power on again after power failure in the related scheme.

[0065] In some implementations, the specific process of issuing a drive reset signal and controlling the reset of the drive module according to the duration of the fault feedback signal in step S130 is described in the following exemplary embodiments.

[0066] Combine the following Figure 3 The flowchart of an embodiment of the method of the present invention is shown, in which a driving reset signal is issued according to the duration of the fault feedback signal and the driving module is controlled to reset, further illustrating the specific process of issuing a driving reset signal and controlling the driving module to reset according to the duration of the fault feedback signal in step S130, including: step S310 to step S320.

[0067] Step S310: After the driving module stops outputting the driving signal to the power module, a driving reset signal is issued.

[0068] Step S320: If it is determined that the level of the issued drive reset signal maintains the set first level for a set second time, the drive module is controlled to reset; wherein the set second time is greater than the set first time, such as Td time.

[0069] exist Figure 8 , Fig. 9 and Fig.10 In the example shown, if the software in the main control part does not control the reset, the low-level driving fault feedback signal FLT of the IGBT driver board starts at time t0 and lasts for Td time, and then becomes high at time t2', and the driver board restores the initial state. After the main control part receives the driving fault feedback signal FLT as high level, it restarts at time t3', and the main control part outputs the driving control signal PWM, and the IGBT driver board drives the IGBT module to work normally. Among them, the time t2' is the time after the time Td lasts since time t0. At time t2', the fault feedback signal FLT becomes high level, and the main control part restarts at time t3' after receiving the high level. The time from t2' to t3' is the delay time for the main control part to detect the signal and control the restart. In the scheme of the present invention, the software in the main control part does not control the reset, and after the driving fault occurs, there is no need for human control. After waiting for Td time, the IGBT driver board automatically performs the reset action, restores the initial default state, and can be restarted at any time, so that the drive can be quickly reset without power off, and preparations before restarting are made.

[0070] The solution of the present invention proposes a solution for fast resetting of the inverter after a drive failure. When a fault occurs, the drive feedback outputs a fault low-level signal. When software control is required to reset as soon as possible, the main control part outputs a reset signal to the drive chip to control the drive reset; or, when a drive failure occurs, the drive feedback fault feedback signal FLT is low-level, and after a Td period of time, a normal high level is output to restore the initial state and complete the automatic reset. Therefore, the drive can be quickly reset without powering off to prepare for restarting.

[0071] In the scheme of the present invention, when a drive failure occurs in the frequency converter (such as a drive failure caused by interference), the software reset time is shorter than the automatic reset time. During the waiting time for the automatic reset, if software-controlled quick reset is required, the reset can be controlled without waiting for the automatic reset time. Among them, whether to use software reset or wait time for automatic reset depends on customer needs and test requirements. If a quick reset and power-on are required, software-controlled reset must be used.

[0072] In some implementations, the specific process of controlling the inverter to restart in step S140 is described in the following exemplary embodiments.

[0073] Combine the following Figure 4 The flowchart of an embodiment of controlling the inverter to restart in the method of the present invention further illustrates the specific process of controlling the inverter to restart in step S140, including: step S410 to step S420.

[0074] Step S410: when a driving fault occurs in the driving module, determining whether the type of the driving fault occurring in the driving module belongs to a preset restart-allowed fault type.

[0075] Step S420: If it is determined that the type of the driving fault occurring in the driving module belongs to a preset restart-allowed fault type, then after the driving module is reset and set for a third time, a driving control signal is output to the driving module, so that the driving module outputs a driving signal to the power module based on the driving control signal, so as to restart the power module and realize restart control of the inverter; wherein the set third time is less than the set minimum reset time of the driving module, such as the time from t3 to t4, or the time from t2' to t3'.

[0076] like Fig.10 As shown in the figure, the method for quickly resetting the inverter after a drive fault includes:

[0077] Step 1: When a drive fault occurs in the inverter, the IGBT driver board outputs a low-level fault signal (such as a fault feedback signal FLT), and the IGBT driver board stops outputting a drive signal DRIVE to the IGBT module, and then executes step 2.

[0078] Step 2: The main control part stops driving the control signal PWM, and then executes step 3.

[0079] Step 3, determine whether the main control part outputs the reset signal RST: if so, execute step 4, otherwise execute step 5.

[0080] Step 4: The fault feedback signal FLT returns to a high level, and then step 6 is executed.

[0081] Step 5: After the fault feedback signal FLT remains at a high level for Td time, it returns to step 6.

[0082] Step 6: After the IGBT driver board is reset, proceed to step 7.

[0083] Step 7, the main control part determines whether to restart: if yes, execute step 8, if no, end the control. The main control part determines whether to restart, specifically, the main control part can determine whether to restart according to the fault type: restart is allowed when the type of drive fault of the inverter belongs to the fault type that allows restart, such as undervoltage protection caused by short-term fluctuations in the power grid, otherwise restart is not allowed.

[0084] Step 8: The main control part outputs a driving control signal PWM to the IGBT driving board, and the IGBT driving board drives the IGBT module to work normally.

[0085] In the scheme of the present invention, the fault feedback signal FLT of the inverter drive fault is normally high level and fault low level. After the inverter drive fault, the software can be quickly reset or automatically reset. If restart is required, the software can directly control the startup. In this way, after the inverter drive fault is reported, the software can be quickly reset through software control, the drive part is reset to the initial state, and the inverter works normally; if the software reset is not required, the fault can be automatically cleared within a short period of time, the drive part is reset to the initial state, and the inverter works normally. Therefore, after the inverter drive fault, the drive can be quickly reset without power off, and preparations can be made before restarting.

[0086] The technical solution of this embodiment is adopted, through the main control part of the frequency converter (such as the main chip), the power module (such as the IGBT module) in the inverter, and the driving board (such as the IGBT driving board) of the power module (such as the IGBT module); when the IGBT driving board detects a driving fault of the IGBT module, the IGBT driving board feeds back the driving fault signal of the IGBT module (such as the fault feedback signal FLT) to the main chip, and the main chip sends a reset signal DSP-RST through software to control the resetting of the IGBT driving board, or automatically sends a reset signal DSP-RST to control the resetting of the IGBT driving board after the fault feedback signal FLT lasts for a short time; thus, by controlling the reset of the driving board through software after the frequency converter driving fault, or automatically controlling the reset of the driving board after the driving fault lasts for a short time, quick reset can be achieved without powering off, which is simple to operate and saves time and effort.

[0087] Preferably, in the solution of the present invention, a driving reset signal control circuit is set in the main control part for the frequency converter (such as the main chip), the power module (such as the IGBT module) in the inverter, and the driving board (such as the IGBT driving board) of the power module (such as the IGBT module). The driving reset signal control circuit is set between the reset signal DSP-RST output end of the main chip and the receiving end of the driving reset signal RST of the IGBT driving board to stabilize the driving reset signal RST; when the IGBT driving board detects a driving fault of the IGBT module, the IGBT driving board will IGBT-RST. The driving fault signal of the BT module (such as the fault feedback signal FLT) is fed back to the main chip, and the main chip sends a reset signal DSP-RST through the software to control the reset of the IGBT driving board through the driving reset signal control circuit, or automatically sends a reset signal DSP-RST after the fault feedback signal FLT lasts for a short time to realize the reset of the IGBT driving board through the driving reset signal control circuit; thus, by controlling the reset of the driving board through software after the inverter driving fault, or automatically controlling the reset of the driving board after the driving fault lasts for a short time, quick reset can be achieved without powering off, which is simple to operate and saves time and effort.

[0088] According to an embodiment of the present invention, a control device for a frequency converter corresponding to the control method for the frequency converter is also provided. Figure 5The structure diagram of an embodiment of the device of the present invention is shown. The frequency converter has an inverter, and the inverter has a power module (such as an IGBT module) and a driving module of the power module (such as an IGBT driving board); the driving module can detect whether the power module has a driving fault and obtain a fault feedback signal; when the driving module detects that the driving module has a driving fault, the level of the fault feedback signal is a set first level (such as a low level), and the driving module stops outputting the driving signal to the power module; when the driving module detects that the driving module has not a driving fault, the level of the fault feedback signal is a set second level (such as a high level). In the scheme of the present invention, Figure 5 As shown, the control device of the frequency converter includes: an acquisition unit 102 and a control unit 104.

[0089] The acquisition unit 102 is configured to acquire the fault feedback signal detected by the driving module. The specific functions and processing of the acquisition unit 102 refer to step S110.

[0090] The control unit 104 is configured to determine whether the level of the fault feedback signal is a set first level. The specific functions and processing of the control unit 104 refer to step S120.

[0091] The control unit 104 is further configured to stop outputting the drive control signal to the drive module if it is determined that the level of the fault feedback signal is the set first level, so as to further stop the drive module from outputting the drive signal to the power module, so as to shut down the inverter; thereafter, a drive reset signal is sent through software and the drive module is reset, or a drive reset signal is sent according to the duration of the fault feedback signal and the drive module is reset; of course, if it is determined that the level of the fault feedback signal is not the set first level, the current state of the drive module is maintained. The specific functions and processing of the control unit 104 are also shown in step S130.

[0092] The control unit 104 is further configured to control the inverter to restart after controlling the drive module to reset. The specific functions and processing of the control unit 104 are also shown in step S140.

[0093] Figure 6 The figure is a schematic diagram of the drive control and drive feedback device of the inverter. Figure 6As shown in the figure, the drive control and drive feedback device of the frequency converter mainly includes the main control part, the IGBT drive board and the IGBT module. The main control part is mainly responsible for outputting the drive control signal PWM and processing the drive signal DRIVE; the IGBT drive board processes the drive control signal PWM of the main control part and then outputs the drive signal DRIVE to the IGBT module, synchronously performs fault inspection on the IGBT module, and transmits the fault feedback signal FLT to the main control part.

[0094] exist Figure 6 In the example shown, the main control part is mainly responsible for outputting the drive control signal PWM and the drive reset signal RST, as well as receiving the fault feedback signal FLT fed back by the IGBT driver board. The drive reset signal RST is normally output at a high level, and when reset is required, the drive reset signal RST is output at a low level. The IGBT module starts working after receiving the drive signal DRIVE output by the IGBT driver board. The IGBT driver board is an important "bridge" between the main control part and the IGBT. The IGBT driver board processes the control signal PWM output by the main control part, outputs the drive signal DRIVE to the IGBT module, and detects the IGBT module in real time during the operation of the unit. When the unit is operating normally, the fault feedback signal FLT output by the IGBT driver board to the main control part is a high level. Once a fault is detected, the fault feedback signal FLT is output at a low level.

[0095] The solution of the present invention proposes a solution for fast resetting after a frequency converter driving fault. After the driving board of the frequency converter feedbacks the driving fault, the driving board can be reset by software control, so that the driving board can be quickly reset and start working; it can also automatically and quickly reset after the driving fault without any instructions and actions after the fault feedback signal FLT lasts for a short time. Thus, fast resetting can be achieved without power off, and it can be quickly started when restarting is needed, without manual operation and saving time and labor.

[0096] Compared with the related schemes that require manual power off and then power on to complete the drive reset, the scheme of the present invention can achieve rapid reset when the drive fails without any instructions and actions, solving the problem that the related schemes require manual power off and then power on to complete the drive reset. In the scheme of the present invention, the output reset signal can be controlled by software to achieve rapid reset when the drive fails; thus, rapid reset can be achieved without power off, and the inverter can be quickly started when it needs to be restarted, solving the problem that the related schemes cannot meet the requirements of rapid reset after drive failure to enable the drive to quickly resume work.

[0097] In some embodiments, a control module is provided at the front end of the driving module, such as Figure 7 The driving reset signal control circuit shown.

[0098] Among them, the control module is used to perform voltage stabilization and filtering processing on the drive reset signal based on the drive reset signal issued by software, or the drive reset signal issued according to the duration of the fault feedback signal, and then output it to the drive module to control the reset of the drive module.

[0099] Figure 7 Figure 1 is a schematic diagram of the structure of the driving reset signal control circuit. Figure 7 The driving reset signal control circuit shown is set in Figure 6 In the main control part shown, in order to ensure that the driving reset signal RST is a stable high level or low level, the reliability of the reset control of the IGBT driving board is improved.

[0100] In some embodiments, the control module includes: a first resistance module (such as resistor R1), a second resistance module (such as resistor R2), a third resistance module (such as resistor R3), a switch tube module (such as transistor Q1), and a capacitor module (such as capacitor C1).

[0101] Wherein, the driving reset signal is input to the control end of the switch tube module (such as the base of the transistor Q1) after passing through the first resistor module; the control end of the switch tube module (such as the base of the transistor Q1) is grounded after passing through the second resistor module. A preset DC power supply (such as a +5V power supply) is connected to the first connection end of the switch tube module (such as the collector of the transistor Q1) after passing through the third resistor module; the first connection end of the switch tube module (such as the collector of the transistor Q1) is grounded after passing through the capacitor module; the first connection end of the switch tube module (such as the collector of the transistor Q1) is connected to the reset end of the driving module. The second connection end of the switch tube module (such as the emitter of the transistor Q1) is grounded.

[0102] like Figure 7 The driving reset signal control circuit shown includes: resistor R1, resistor R2, resistor R3, capacitor C1, transistor Q1. The reset signal DSP-RST output by the main control chip (such as DSP chip) in the main control part is input to the base of the transistor Q1 after passing through the resistor R1; the base of the transistor Q1 is grounded after passing through the resistor R2; the +5V power supply is connected to the collector of the transistor Q1 after passing through the resistor R3; the emitter of the transistor Q1 is grounded; the emitter of the transistor Q1 is grounded after passing through the capacitor C1; the common end of the emitter of the transistor Q1, the resistor R3 and the capacitor C1 outputs the driving reset signal RST to the IGBT driving board.

[0103] exist Figure 7In the example shown, resistors R1, R2 and R3 are matching resistors, and capacitor C1 is a filter capacitor. The DSP-RST signal is a reset signal output by the main control processor (such as a DSP chip). The reset signal DSP-RST is normally at a low level. At this time, transistor Q1 is not turned on, and the reset signal RST is pulled up to +5V to output a high level to the IGBT driver board. When it is necessary to restart the machine, that is, when the driver needs to reset, the reset signal DSP-RST is output at a high level, transistor Q1 is turned on, and the reset signal RST is driven to output a low level to the IGBT driver board. The IGBT driver board detects that the low level duration of the reset signal RST reaches Td and performs a reset action to restore the initial default state, and the fault is cleared.

[0104] In the solution of the present invention, it is provided as follows Figure 7 The driving reset signal control circuit indicated in, but not limited to Figure 7 The circuit shown.

[0105] In the scheme of the present invention, through the scheme of rapid resetting after the inverter drive fault, when the inverter needs to be restarted after the drive fault occurs, the drive fault can be quickly reset through software control to achieve fault clearing, and the drive can be restored to the initial state without power off, and the inverter can be quickly started when it needs to be restarted. The scheme of the present invention can achieve that after the inverter drive fault occurs, the drive board completes automatic fault reset and restores the initial state, and the drive fault reset can be completed without power off and human intervention, and the inverter can be quickly started when it needs to be restarted.

[0106] In some implementations, the control unit 104 sends a driver reset signal through software and controls the driver module to reset, including:

[0107] The control unit 104 is further configured to send a drive reset signal through software after stopping outputting the drive control signal to the drive module for a set period of time. The specific functions and processing of the control unit 104 are also shown in step S210.

[0108] The control unit 104 is further configured to control the reset of the driving module if it is determined that the level of the driving reset signal sent by the software maintains the set first level for a set first time; wherein the set first time is greater than the set minimum reset time of the driving module, the set duration is such as the time from t1 to t2, the set first time is such as time t, and the set minimum reset time of the driving module is such as the minimum reset time T-RST of the IGBT driving board. The specific functions and processing of the control unit 104 are also referred to step S220.

[0109] Figure 8 This is a schematic diagram of the signal waveform when the software controls the reset. Figure 8 The waveforms in correspond to the drive control signal PWM and the drive reset signal RST output by the main control part, the drive signal DRIVE output by the IGBT drive board and the fault feedback signal FLT given to the main control part, and the time t is the low level duration of the drive reset signal RST. Fig. 9 Schematic diagram of signal waveform during automatic reset, wherein time Td represents the low level duration of the drive fault feedback signal FLT. Fig.10 It is a flow chart of a method for quickly resetting the inverter after a drive fault. If a drive fault occurs and the main control part outputs a drive reset signal RST, the fault feedback signal FLT will return to a high level; if a drive fault occurs but the main control part does not output a drive reset signal RST, the fault feedback signal FLT will return to a high level after a duration of Td.

[0110] In the solution of the present invention, the process of quickly resetting the inverter after a drive failure is as follows: Fig.10 As shown, the waveforms of each signal in the initial state are as follows Figure 8 and Fig. 9 As shown, before time t0, Figure 8 and Fig. 9 They are signal waveform diagrams of software-controlled reset and automatic reset in the solution of the present invention, respectively. The waveforms from top to bottom correspond to the drive control signal PWM output by the main control part, the drive signal DRIVE output by the IGBT driver board, the drive reset signal RST output by the main control part, and the fault feedback signal FLT given to the main control part by the IGBT driver board. In the initial default state, the drive reset signal RST and the fault feedback signal FLT are high level, and continue to maintain a high level during the normal operation of the inverter. At t0, the IGBT driver board detects that a fault has occurred in the inverter drive, synchronously stops the output of the drive signal DRIVE, and outputs the fault feedback signal FLT as a low level. After receiving the fault feedback signal FLT, the main control part stops outputting the drive control signal PWM at t1. Among them, t1 is the next moment relative to t0 in a cycle.

[0111] exist Figure 8 , Fig. 9 and Fig.10In the example shown, if the software in the main control part controls the reset, the main control part software controls the output of a low level with a time of t at time t2. When the low level duration t is greater than the minimum reset time T-RST of the IGBT driver board, the IGBT driver board is reset to the initial state at time t3, and the fault feedback signal FLT is restored to a high level, completing the drive reset. After the main control part receives the drive fault feedback signal FLT as a high level, it restarts at time t4, the main control part outputs the drive control signal PWM, and the IGBT module also starts to work normally. Among them, the time t is 20ms to 50ms. In the scheme of the present invention, the main control part software controls the reset, so that after a drive fault occurs, the software can quickly complete the drive reset and re-complete the inverter startup, which solves the problem that the related scheme cannot meet the requirements of fast reset after the drive fault and fast drive recovery work, and saves the time required to power off and wait for the inverter to power on again after power failure in the related scheme.

[0112] In some implementations, the control unit 104 sends a drive reset signal and controls the drive module to reset according to the duration of the fault feedback signal, including:

[0113] The control unit 104 is further configured to send a drive reset signal after the drive module stops outputting the drive signal to the power module. The specific functions and processing of the control unit 104 are also shown in step S310.

[0114] The control unit 104 is further configured to control the driver module to reset if it is determined that the level of the driving reset signal sent maintains the set first level for a set second time; wherein the set second time is greater than the set first time, and the set second time is such as Td time. The specific functions and processing of the control unit 104 are also referred to step S320.

[0115] exist Figure 8 , Fig. 9 and Fig.10In the example shown, if the software in the main control part does not control the reset, the low-level driving fault feedback signal FLT of the IGBT driver board starts at time t0 and lasts for Td time, and then becomes high at time t2', and the driver board restores the initial state. After the main control part receives the driving fault feedback signal FLT as high level, it restarts at time t3', and the main control part outputs the driving control signal PWM, and the IGBT driver board drives the IGBT module to work normally. Among them, the time t2' is the time after the time Td lasts since time t0. At time t2', the fault feedback signal FLT becomes high level, and the main control part restarts at time t3' after receiving the high level. The time from t2' to t3' is the delay time for the main control part to detect the signal and control the restart. In the scheme of the present invention, the software in the main control part does not control the reset, and after the driving fault occurs, there is no need for human control. After waiting for Td time, the IGBT driver board automatically performs the reset action, restores the initial default state, and can be restarted at any time, so that the drive can be quickly reset without power off, and preparations before restarting are made.

[0116] The solution of the present invention proposes a solution for fast resetting of the inverter after a drive failure. When a fault occurs, the drive feedback outputs a fault low-level signal. When software control is required to reset as soon as possible, the main control part outputs a reset signal to the drive chip to control the drive reset; or, when a drive failure occurs, the drive feedback fault feedback signal FLT is low-level, and after a Td period of time, a normal high level is output to restore the initial state and complete the automatic reset. Therefore, the drive can be quickly reset without powering off to prepare for restarting.

[0117] In the scheme of the present invention, when a drive failure occurs in the frequency converter (such as a drive failure caused by interference), the software reset time is shorter than the automatic reset time. During the waiting time for the automatic reset, if software-controlled quick reset is required, the reset can be controlled without waiting for the automatic reset time. Among them, whether to use software reset or wait time for automatic reset depends on customer needs and test requirements. If a quick reset and power-on are required, software-controlled reset must be used.

[0118] In some implementations, the control unit 104 controls the inverter to restart, including:

[0119] The control unit 104 is further configured to determine whether the type of the driving fault of the driving module belongs to a preset restart-allowed fault type when the driving fault occurs in the driving module. The specific functions and processing of the control unit 104 are also shown in step S410.

[0120] The control unit 104 is further configured to output a drive control signal to the drive module after the third time set by the drive module reset if it is determined that the type of the drive fault occurring in the drive module belongs to a preset restart-allowed fault type, so that the drive module outputs a drive signal to the power module based on the drive control signal to restart the power module and realize restart control of the inverter; wherein the set third time is less than the set minimum reset time of the drive module, and the set third time is such as the time from t3 to t4, or the time from t2' to t3'. The specific functions and processing of the control unit 104 are also referred to step S420.

[0121] like Fig.10 As shown in the figure, the method for quickly resetting the inverter after a drive fault includes:

[0122] Step 1: When a drive fault occurs in the inverter, the IGBT driver board outputs a low-level fault signal (such as a fault feedback signal FLT), and the IGBT driver board stops outputting a drive signal DRIVE to the IGBT module, and then executes step 2.

[0123] Step 2: The main control part stops driving the control signal PWM, and then executes step 3.

[0124] Step 3, determine whether the main control part outputs the reset signal RST: if so, execute step 4, otherwise execute step 5.

[0125] Step 4: The fault feedback signal FLT returns to a high level, and then step 6 is executed.

[0126] Step 5: After the fault feedback signal FLT remains at a high level for Td time, it returns to step 6.

[0127] Step 6: After the IGBT driver board is reset, proceed to step 7.

[0128] Step 7, the main control part determines whether to restart: if yes, execute step 8, if no, end the control. The main control part determines whether to restart, specifically, the main control part can determine whether to restart according to the fault type: restart is allowed when the type of drive fault of the inverter belongs to the fault type that allows restart, such as undervoltage protection caused by short-term fluctuations in the power grid, otherwise restart is not allowed.

[0129] Step 8: The main control part outputs the driving control signal PWM to the IGBT driving board, and the IGBT driving board drives the IGBT module to work normally.

[0130] In the scheme of the present invention, the fault feedback signal FLT of the inverter drive fault is normally high level and fault low level. After the inverter drive fault, the software can be quickly reset or automatically reset. If restart is required, the software can directly control the startup. In this way, after the inverter drive fault is reported, the software can be quickly reset through software control, the drive part is reset to the initial state, and the inverter works normally; if the software reset is not required, the fault can be automatically cleared within a short period of time, the drive part is reset to the initial state, and the inverter works normally. Therefore, after the inverter drive fault, the drive can be quickly reset without power off, and preparations can be made before restarting.

[0131] Since the processing and functions implemented by the device of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0132] According to an embodiment of the present invention, a frequency converter corresponding to the control device of the frequency converter is also provided. The frequency converter may include: the control device of the frequency converter described above.

[0133] Since the processing and functions implemented by the frequency converter of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned devices, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0134] According to an embodiment of the present invention, a computer program product corresponding to a frequency converter is also provided, comprising a computer program, and when the computer program is executed by a processor, the steps of the frequency converter control method described above are implemented.

[0135] Since the processing and functions implemented by the product of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned inverter, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0136] According to an embodiment of the present invention, a storage medium corresponding to the inverter control method is also provided, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the steps of the inverter control method described above.

[0137] Since the processing and functions implemented by the storage medium of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned method, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments, and no further elaboration will be made here.

[0138] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0139] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A control method for a frequency converter, characterized in that: The frequency converter has an inverter, and the inverter has a power module and a driving module of the power module; the driving module can detect whether the power module has a driving fault and obtain a fault feedback signal; When the driving module detects that a driving fault occurs in the driving module, the level of the fault feedback signal is a set first level, and the driving module stops outputting a driving signal to the power module; When the driving module detects that no driving fault occurs to the driving module, the level of the fault feedback signal is a set second level; The control method of the frequency converter comprises: Acquiring the fault feedback signal detected by the driving module; Determining whether the level of the fault feedback signal is a set first level; If it is determined that the level of the fault feedback signal is the set first level, stop outputting the drive control signal to the drive module to stop the inverter; then, send a drive reset signal through software and control the drive module to reset, or send a drive reset signal according to the duration of the fault feedback signal and control the drive module to reset; After controlling the driving module to reset, controlling the frequency converter to restart.

2. The control method of the frequency converter according to claim 1, characterized in that: A control module is provided at the front end of the driving module; wherein, The control module is used to perform voltage stabilization and filtering processing on the drive reset signal based on the drive reset signal issued by software, or the drive reset signal issued according to the duration of the fault feedback signal, and then output it to the drive module to control the reset of the drive module.

3. The control method of the frequency converter according to claim 2, characterized in that: The control module includes: a first resistance module, a second resistance module, a third resistance module, a switch module, and a capacitor module; wherein, The driving reset signal is input to the control end of the switch tube module after passing through the first resistor module; the control end of the switch tube module is grounded after passing through the second resistor module; A preset DC power supply is connected to the first connection end of the switch tube module after passing through the third resistor module; the first connection end of the switch tube module is grounded after passing through the capacitor module; the first connection end of the switch tube module is connected to the reset end of the driving module; The second connection end of the switch tube module is grounded.

4. The control method of the frequency converter according to any one of claims 1 to 3, characterized in that: Sending a driver reset signal through software and controlling the driver module to reset includes: After stopping outputting the drive control signal to the drive module for a set period of time, sending a drive reset signal through software; If it is determined that the level of the driving reset signal issued by the software maintains a set first level for a set first time, the driving module is controlled to reset; wherein the set first time is greater than a set minimum reset time of the driving module.

5. The control method of the frequency converter according to any one of claims 1 to 3, characterized in that: The method includes sending a drive reset signal according to the duration of the fault feedback signal and controlling the drive module to reset, including: After the driving module stops outputting the driving signal to the power module, sending a driving reset signal; If it is determined that the level of the sent driving reset signal maintains a set first level for a set second time, the driving module is controlled to reset; wherein the set second time is greater than the set first time.

6. The control method of the frequency converter according to any one of claims 1 to 5, characterized in that: Controlling the inverter to restart, comprising: In the case where a driving fault occurs in the driving module, determining whether the type of the driving fault occurring in the driving module belongs to a preset restart-allowed fault type; If it is determined that the type of driving fault occurring in the driving module belongs to a pre-set restart-allowed fault type, then after the third time set for resetting the driving module, a driving control signal is output to the driving module, so that the driving module outputs a driving signal to the power module based on the driving control signal to restart the power module, thereby realizing restart control of the inverter; wherein the set third time is less than the set minimum reset time of the driving module.

7. A control device for a frequency converter, characterized in that: The frequency converter has an inverter, and the inverter has a power module and a driving module of the power module; the driving module can detect whether the power module has a driving fault and obtain a fault feedback signal; When the driving module detects that a driving fault occurs in the driving module, the level of the fault feedback signal is a set first level, and the driving module stops outputting a driving signal to the power module; When the driving module detects that no driving fault occurs to the driving module, the level of the fault feedback signal is a set second level; The control device of the frequency converter comprises: an acquisition unit, configured to acquire the fault feedback signal detected by the driving module; a control unit, configured to determine whether the level of the fault feedback signal is a set first level; The control unit is further configured to, if it is determined that the level of the fault feedback signal is a set first level, stop outputting the drive control signal to the drive module to stop the inverter; thereafter, send a drive reset signal through software and control the drive module to reset, or send a drive reset signal according to the duration of the fault feedback signal and control the drive module to reset; The control unit is further configured to control the inverter to restart after controlling the drive module to reset.

8. A frequency converter, characterized in that: include: The control device for a frequency converter as claimed in claim 7.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the control method for the frequency converter according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the inverter control method according to any one of claims 1 to 6 are implemented.

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