Shift-position drive system, method, and storage medium

Abstract

The present invention provides a gear-shift drive system, method, and storage medium. The gear-shift drive system detects the current current signal at the load end through a current detection circuit and sends the current current signal to a signal processing circuit. The signal processing circuit determines the current drive gear of the IGBT through a preset mapping relationship based on the current current signal and outputs a drive gear signal corresponding to the current drive gear to the drive circuit. The drive circuit adjusts the drive parameters of the driver based on the current drive gear in the drive gear signal and generates a current drive signal using the adjusted driver. The current drive signal is sent to the control end of the IGBT to drive the IGBT. In the present invention, the drive capability of the driver is adjusted according to the current current signal, so that when the current at the load end increases, the drive parameters of the driver are adjusted by the gear shift to increase the collector-emitter voltage change, thereby effectively reducing the turn-on loss of the IGBT.

Description

Technical Field

[0001] The present invention relates to the field of drive technology, and in particular to a gear-shift drive system, method and storage medium. Background Art

[0002] As a core component of power electronic equipment, the operating state of the insulated gate bipolar transistor (IGBT) is extremely important and plays a vital role in the efficient and reliable operation of the equipment. The switching characteristics of the IGBT are of particular concern. Excessive rates of change of the collector-emitter voltage and collector current can cause electromagnetic interference (EMI), while excessively low rates of change of the collector-emitter voltage and collector current can lead to high switching losses. These two characteristics are mutually exclusive.

[0003] During IGBT driving, the smaller the load current, the faster the IGBT turns on, meaning the greater the rate of change of the collector-emitter voltage. As the current increases, the rate of change of the collector-emitter voltage gradually decreases, leading to a significant increase in turn-on losses.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide a gear-shifting driving system, method and storage medium, aiming to solve the technical problem in the prior art of reducing IGBT turn-on loss when the load current increases.

[0006] To achieve the above object, the present invention proposes a shift-position drive system, which includes: a current detection circuit, a signal processing circuit and a drive circuit;

[0007] The current detection circuit is connected to the signal processing circuit and the load end respectively, and the drive circuit is connected to the signal processing circuit and the control end of the IGBT respectively;

[0008] The current detection circuit is used to detect the current current signal of the load end and send the detected current current signal to the signal processing circuit;

[0009] The signal processing circuit is configured to determine a current driving gear of the IGBT according to the current current signal through a preset mapping relationship, and output a driving gear signal corresponding to the current driving gear to the driving circuit;

[0010] The driving circuit is configured to adjust a driving parameter of the driver according to the current driving gear position in the signal representing the driving gear position, and generate a current driving signal using the adjusted driver;

[0011] The driving circuit is further configured to send the current driving signal to the control terminal of the IGBT to drive the IGBT.

[0012] Optionally, the current detection circuit is further configured to collect a current signal at the load end to determine a current range set at the load end;

[0013] The signal processing circuit is further used to obtain a preset number of driving gears;

[0014] The signal processing circuit is further configured to divide the current range into the preset number of driving gears to determine a preset mapping relationship between the driving gears and the current.

[0015] Optionally, the signal processing circuit is further configured to obtain a maximum limit value or a maximum limit range of electromagnetic interference in a current environment;

[0016] The signal processing circuit is further configured to determine a set of collector-emitter voltage change rates of the IGBT according to a maximum limit value or a maximum limit range of the electromagnetic interference;

[0017] The signal processing circuit is further configured to divide the collector-emitter voltage change rate set into gears to obtain a preset number of driving gears.

[0018] Optionally, the signal processing circuit is further configured to predict the next cycle current signal of the load end based on the current signal and the previous cycle current signal;

[0019] The signal processing circuit is further used to determine the driving gear of the IGBT in the next cycle through a preset mapping relationship according to the current signal of the next cycle, and output a driving gear signal corresponding to the driving gear of the next cycle to the driving circuit.

[0020] To achieve the above object, the present invention further proposes a shift-position driving method, the shift-position driving method comprising:

[0021] Detect the current signal at the load end;

[0022] Determining a current driving gear of the IGBT through a preset mapping relationship according to the current current signal;

[0023] Adjusting the driving parameters of the driver according to the current driving gear, and generating a current driving signal using the adjusted driver;

[0024] The current driving signal is sent to the control terminal of the IGBT to drive the IGBT.

[0025] Optionally, before the step of detecting the current signal at the load end, the method further includes:

[0026] Collecting the current signal of the load end to determine the current range set of the load end;

[0027] Obtaining a preset number of drive gears;

[0028] The preset number of driving gears divides the current range set to determine a preset mapping relationship between the driving gear and the current.

[0029] Optionally, the step of obtaining a preset number of driving gears includes:

[0030] Obtaining a set of collector-emitter voltage change rates of the IGBT;

[0031] The collector-emitter voltage change rate set is divided into gears to obtain a preset number of driving gears.

[0032] Optionally, the step of obtaining a set of collector-emitter voltage change rates of the IGBT includes:

[0033] Obtain the limit value or limit range of electromagnetic interference in the current environment;

[0034] A set of collector-emitter voltage change rates of the IGBT is determined according to a limit value or a limit range of the electromagnetic interference.

[0035] Optionally, after the step of detecting the current current signal at the load end, the method further includes:

[0036] Predicting the next cycle current signal of the load end according to the current current signal and the previous cycle current signal;

[0037] The next cycle current signal is used as the current current signal, and the process returns to the step of determining the current driving gear of the IGBT through a preset mapping relationship according to the current current signal.

[0038] To achieve the above object, the present invention further proposes a storage medium, on which a shift position driving program is stored. When the shift position driving program is executed by a processor, the steps of the shift position driving method described above are implemented.

[0039] The present invention provides a gear-shift drive system, method and storage medium, wherein the gear-shift drive system includes a current detection circuit, a signal processing circuit and a drive circuit; the current detection circuit is respectively connected to the signal processing circuit and the load end, and the drive circuit is respectively connected to the signal processing circuit and the control end of the IGBT; the current detection circuit detects the current current signal of the load end, and sends the detected current current signal to the signal processing circuit; the signal processing circuit determines the current drive gear of the IGBT through a preset mapping relationship according to the current current signal, and outputs a drive gear signal corresponding to the current drive gear to the drive circuit; the drive circuit adjusts the drive parameters of the driver according to the current drive gear in the drive gear signal, and generates a current drive signal using the adjusted driver; the drive circuit sends the current drive signal to the control end of the IGBT to drive the IGBT. In the present invention, the current driving gear of the IGBT is determined according to the current current signal collected, and then the driving capability of the driver is adjusted according to the current driving gear, so that when the load end current increases, the driving parameters of the driver are adjusted by the gear position to increase the collector-emitter voltage change, thereby reducing the IGBT turn-on loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0041] Figure 1 This is a schematic structural diagram of a first embodiment of the gear-shifting drive system proposed by the present invention;

[0042] Figure 2 A graph showing the relationship between IGBT turn-on characteristics and current in the prior art;

[0043] Figure 3 A graph showing the relationship between the IGBT turn-on characteristics and current corresponding to the gear-shift drive system proposed in the present invention;

[0044] Figure 4 This is a graph showing the relationship between the IGBT turn-on characteristics and current at different drive gears of the split-gear drive system proposed by the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of the inverter circuits driving different gears in the gear-shifting drive system proposed by the present invention;

[0046] Figure 6A graph showing the relationship between the IGBT turn-on characteristic and the current in the gear-shift drive system proposed by the present invention, in which the maximum value of the collector-emitter voltage change rate is set to limit the turn-on characteristic;

[0047] Figure 7 A graph showing the relationship between the IGBT turn-on characteristic and the current in the gear-shift drive system proposed by the present invention, in which the maximum range of the collector-emitter voltage change rate is limited;

[0048] Figure 8 This is a flow chart of the first embodiment of the gear-shift driving method proposed by the present invention;

[0049] Figure 9 This is a flow chart of a second embodiment of the gear-shift driving method proposed by the present invention;

[0050] Figure 10 This is a flow chart of the third embodiment of the gear-shift driving method proposed by the present invention.

[0051] Description of Figure Numbers:

[0052]

[0053] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0054] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0056] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0057] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0058] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the first embodiment of the gear-shifting drive system proposed by the present invention. Figure 1 A first embodiment of the gear-shifting drive system of the present invention is provided.

[0059] In this embodiment, the shift-position driving system includes: a current detection circuit 10, a signal processing circuit 20 and a driving circuit 30;

[0060] Among them, the current detection circuit 10 is connected to the signal processing circuit 20 and the load end respectively, the drive circuit 30 is connected to the signal processing circuit 20 and the control end of the IGBT respectively, the output end of the IGBT can be connected to the drive circuit 30, and the input end of the IGBT can be connected to a DC power supply.

[0061] It should be understood that the turn-on loss during the driving process of the IGBT is mainly based on the voltage between the collector and the emitter. When the voltage change rate between the collector and the emitter is small, the IGBT conduction rate is slow, which leads to increased switching losses of the IGBT; when the voltage change rate between the collector and the emitter is large, the IGBT conduction rate is fast, which can reduce the turn-on loss of the IGBT. The relationship between the IGBT turn-on characteristics and current is as follows: Figure 2 As shown, although a larger collector-emitter voltage change rate dv / dt of the IGBT reduces turn-on losses, due to the relationship between the collector-emitter voltage change rate dv / dt and EMI, a larger collector-emitter voltage change rate dv / dt can also result in higher EMI. In this embodiment, the IGBT driving process meets the EMI requirements of the current environment. Furthermore, a greater load current, i.e., a greater current output by the IGBT output terminal, corresponds to a higher load voltage value, and a lower collector-emitter voltage change rate dv / dt. Therefore, when the load current is higher, the IGBT turn-on losses also increase.

[0062] It should be noted that the current detection circuit 10 is a circuit for collecting the current at the load end. The current detection circuit 10 can be a detection circuit composed of components such as a Hall element, a current transformer or a Rogowski coil in combination with related peripheral components. The signal processing circuit 20 can be used to process the received current signal and determine the information carried by the current signal or other information corresponding to the current signal. In this embodiment, the signal processing circuit 20 can be composed of a chip such as a single-chip microcomputer and an ARM, and the chip in the signal processing circuit 20 includes a signal processing program. The drive circuit 30 is a circuit for outputting a drive signal to drive the IGBT. The drive circuit 30 includes a driver that can output a drive signal of a certain voltage value.

[0063] In a specific implementation, the current detection circuit 10 can detect the current current signal of the load end, i.e., the output end of the IGBT, and send the detected current current signal to the signal processing circuit 20; the signal processing circuit 20 can use a relevant program or software algorithm to determine the current drive gear of the IGBT through a preset mapping relationship based on the current current signal, and output the characterizing drive gear signal corresponding to the current drive gear to the drive circuit 30; the drive circuit 30 can adjust the drive parameters of the driver according to the current drive gear in the characterizing drive gear signal, and use the adjusted driver to generate a current drive signal; and then send the current drive signal to the control end of the IGBT to drive the IGBT.

[0064] Among them, the current current signal refers to the current value collected in the load end at the current point in time. The preset mapping relationship is the mapping relationship between the preset current value of the load end and the drive gear. One of the drive gears can correspond to a load end current value I within a range. For example, when the current value of the load end is between 0 and 100A, the driving capability corresponding to a drive gear can be used to drive the IGBT; when the current value of the load end is between 100 and 200A, the driving capability corresponding to another drive gear is required to drive the IGBT. Adjusting the drive parameters is a parameter for adjusting the driving capability of the driver. The driving capabilities corresponding to different drive gears are not the same. The driving capability corresponding to the drive gear with a larger current value at the load end can make the collector-emitter voltage change rate dv / dt greater than the driving capability corresponding to the drive gear with a smaller current value. Reference Figure 3 and Figure 4 , Figure 3 It represents the gear distribution scheme of current changing from zero to amplitude within a current cycle. Figure 3The four drive gears are used as an example for illustration; the specific number of gears is not limited in this embodiment. A shows the relationship between the collector-emitter voltage change rate dv / dt and the load current value I under different drive capabilities; B shows the relationship between the turn-on loss Eon and the load current value I under different drive capabilities. Figure 4 In the middle, C represents the relationship curve between the collector-emitter voltage change rate dv / dt and the load-end current value I under the gear-shift driving scheme, and D represents the relationship curve between the turn-on loss Eon and the load-end current value I under the gear-shift driving scheme. When the load-end current value I is small, the gear with the weakest driving capability is adopted. As the load-end current value I increases, it switches to the gear with stronger driving capability, then the collector-emitter voltage change rate dv / dt is increased to a relatively high and balanced value, and the turn-on loss Eon is greatly reduced. The current driving gear refers to the driving gear corresponding to the current current signal at the load end. The signal representing the driving gear is an electrical signal including information related to the current driving gear. The voltage values ​​of the signal representing the driving gear corresponding to different driving gears are not the same, and the signal processing unit 20 can drive the driving capability currently required according to the voltage value of the signal representing the driving gear.

[0065] It is understandable that the driving circuit 30 can adjust the driving parameters of the driver by adjusting the variable driving resistance, driving current or the variable driving voltage in the driver. The function of adjusting the driving parameters of the driver can be implemented by hardware.

[0066] In this embodiment, a step-shift drive system is provided. The step-shift drive system includes a current detection circuit, a signal processing circuit, and a drive circuit. The current detection circuit is connected to the signal processing circuit and a load terminal, respectively, and the drive circuit is connected to the signal processing circuit and a control terminal of an IGBT, respectively. The current detection circuit detects a current current signal at the load terminal and transmits the detected current current signal to the signal processing circuit. The signal processing circuit determines the current drive position of the IGBT using a preset mapping relationship based on the current current signal and outputs a drive position signal corresponding to the current drive position to the drive circuit. The drive circuit adjusts the drive parameters of the driver based on the current drive position in the drive position signal and generates a current drive signal using the adjusted drive. The drive circuit transmits the current drive signal to the control terminal of the IGBT to drive the IGBT. In this embodiment, the current drive position of the IGBT is determined based on the collected current current signal, and the drive capability of the driver is then adjusted based on the current drive position. Thus, when the load terminal current value increases, the step-shift drive parameters of the driver are adjusted to increase the collector-emitter voltage change, thereby effectively reducing the IGBT turn-on loss.

[0067] Based on the first embodiment of the above-mentioned gear-split driving system, a second embodiment of the gear-split driving system of the present invention is proposed.

[0068] In this embodiment, the IGBT can be a single IGBT or a circuit structure composed of multiple IGBTs with certain functions. For example, a three-phase half-bridge rectifier circuit or inverter circuit can be applied to both a two-phase full-bridge structure and a single-phase half-bridge structure. In addition, the rectifier circuit or inverter circuit should not be limited to a two-level topology, but can also be adapted to a multi-level topology, including but not limited to a neutral point clamped three-level, an active neutral point clamped three-level, an H-bridge cascade topology, a modular multi-level topology, etc. Figure 5 ,exist Figure 5 In this paper, we take the inverter circuit composed of multiple IGBTs as an example. Figure 5 In FIG, the inverter circuit includes six IGBTs: a first IGBT Q1, a second IGBT Q2, a third IGBT Q3, a fourth IGBT Q4, a fifth IGBT Q5, and a sixth IGBT Q6. The current detection circuit 10 can collect the current output from the output terminals of the first IGBT Q1, the third IGBT Q3, and the fifth IGBT Q5, respectively, according to the phase changes of the three-phase power, to obtain the U-phase current IU, the V-phase current IV, and the W-phase current IW, respectively. The collected current signals are then sent to the signal processing circuit 20. Upon receiving the current signals, the signal processing circuit 20 determines the current drive level for the corresponding IGBT based on the specific current value in the current signals, and then outputs a corresponding drive level signal to the drive circuit 30 based on the current level. Upon receiving the drive level signal, the drive circuit 30 adjusts the internal drive resistance, drive current, or drive voltage of the driver based on the specific voltage value of the drive level signal, and outputs a drive signal corresponding to the drive capability of the adjusted driver to the control terminal of the IGBT, thereby driving the IGBT using the drive capability of the corresponding drive level.

[0069] It should be understood that, in this embodiment, the control terminal of the IGBT is the gate of the IGBT, the input terminal of the IGBT is the collector of the IGBT, and the output terminal of the IGBT is the emitter of the IGBT.

[0070] In this embodiment, before driving the IGBT, it is also necessary to determine the mapping relationship between the current value at the load end and the drive gear, that is, the preset mapping relationship. The preset mapping relationship is a relationship in which the drive gear is determined based on the current value, and one gear corresponds to a current value within a range. Therefore, when determining the preset mapping relationship, the current detection circuit 10 can collect all possible current signals at the load end to determine the current range set of the load end; the signal processing circuit 20 determines a preset number of drive gears, that is, specifically divides the driving capacity into the number of gears. When the number of gears is determined, the signal processing circuit 20 can divide the current range according to the preset number of drive gears to determine the preset mapping relationship between the drive gear and the current.

[0071] It should be understood that, in the process of determining the mapping relationship, it is also necessary to determine the set corresponding to the collector-emitter voltage change rate dv / dt, and then divide it according to the number information of the driving gears to obtain the preset number of driving gears.

[0072] In a specific implementation, all the change rates between the IGBT collector and emitter can be acquired to obtain a collector-emitter voltage change rate set, and then the collector-emitter voltage change rate set can be divided according to the number of driving gears required to obtain a preset number of driving gears.

[0073] It should be understood that the voltage change rate between the collector and emitter of an IGBT must meet the EMI requirements of the environment. A higher collector-emitter voltage change rate (dv / dt) also corresponds to higher EMI. Certain EMI limits exist within the driving environment of the IGBT. These EMI limits can be either a maximum limit or a maximum limit range. For example, in applications with strict EMI requirements, the EMI limit is typically a specific limit value; in less stringent EMI requirements, a maximum limit range can be used.

[0074] Reference Figure 6 and Figure 7 In this embodiment, the signal processing circuit 10 also needs to determine the maximum limit value or maximum limit range of electromagnetic interference in the current environment; then, based on the maximum limit value or maximum limit range of electromagnetic interference, the maximum value or maximum range of the collector-emitter voltage change rate dv / dt of the IGBT is determined by the proportional relationship between electromagnetic interference and the collector-emitter voltage change rate dv / dt. This maximum value or maximum range value is a collector-emitter voltage change rate dv / dt set. Then, a preset number of drive gears is obtained by dividing the collector-emitter voltage change rate set into gears. The specific number of drive gears can be divided multiple times using the collector-emitter voltage change rate dv / dt set, and then the IGBT is driven and tested using each divided drive gear until the optimal number of gears is divided.

[0075] It should be understood that there is a delay time between when the current detection circuit 10 detects the current signal and when the driver in the drive circuit 30 acts on the IGBT. In order to compensate for this delay time, an advance prediction function, namely a delay compensation strategy, is added to the software. The current size at the next turn-on moment is predicted in advance based on the detected current value, and the drive gear is determined based on the predicted current value. This strategy needs to ensure that the hardware circuit delay and the software processing delay meet a certain delay time, that is, the total delay time is less than the carrier frequency period. Since there is a certain regularity in the change of current values ​​in different cycles, for example, when the current value changes as a sinusoidal change, when a current value is collected, the current value at the next time point can be predicted based on the change of the sine wave. In situations where EMI requirements are relatively strict, the collector-emitter voltage change rate dv / dt in all drive gears is lower than this limit value to pass higher EMC standards or adapt to more stringent sites; in situations where EMI requirements are not strict, the collector-emitter voltage change rate dv / dt of the drive gear with the weakest driving capability can be above the limit value, and the collector-emitter voltage change rate dv / dt in other drive gears is lower than this value.

[0076] In a specific implementation, the signal processing circuit 20 can predict the next cycle current signal of the load end based on the current signal and the current signal of the previous cycle; then determine the next cycle drive gear of the IGBT through a preset mapping relationship based on the current signal of the next cycle, and output the drive gear signal corresponding to the next cycle drive gear to the drive circuit 30, thereby realizing the drive delay compensation of the IGBT.

[0077] In this embodiment, a preset mapping relationship is established before driving the IGBT to divide the gears, and the next cycle current signal is predicted after the IGBT drive is completed. The predicted current signal is used to determine the drive gear and drive the IGBT, thereby effectively avoiding the drive delay of the IGBT.

[0078] In addition, to achieve the above purpose, refer to Figure 8 , Figure 8 This is a flow chart of the first embodiment of the split-shift driving method proposed in the present invention. The present invention also provides a split-shift driving method based on the split-shift driving system. Referring to the figure, the split-shift driving method includes:

[0079] Step S10: detecting the current signal of the load end;

[0080] Step S20: determining the current driving gear of the IGBT according to the current current signal through a preset mapping relationship;

[0081] Step S30: adjusting the driving parameters of the driver according to the current driving gear, and generating a current driving signal using the adjusted driver;

[0082] Step S40: sending the current driving signal to the control terminal of the IGBT to drive the IGBT.

[0083] It can be understood that, in this embodiment, the execution body may be a gear-shifting driving system, which includes a voltage acquisition circuit, a signal processing circuit, and a driving circuit.

[0084] It should be understood that the turn-on losses during IGBT driving are primarily dependent on the voltage between the collector and emitter. When the rate of change of the collector-emitter voltage is low, the IGBT conducts slowly, resulting in increased switching losses. However, when the rate of change of the collector-emitter voltage is high, the IGBT conducts quickly, reducing the IGBT's turn-on losses. While a high rate of change of the collector-emitter voltage reduces turn-on losses, due to the relationship between the rate of change of the collector-emitter voltage and EMI, a high rate of change of the collector-emitter voltage can also result in higher EMI. In this embodiment, the IGBT driving process meets the EMI requirements of the current environment. Furthermore, the greater the load current, that is, the greater the current output by the IGBT output terminal, the higher the corresponding load voltage value, and the lower the rate of change of the collector-emitter voltage. Therefore, when the load current is high, the IGBT's turn-on losses also increase.

[0085] It should be noted that the current detection circuit is a circuit for collecting the current at the load end. The current detection circuit can be a detection circuit composed of components such as a Hall element, a current transformer or a Rogowski coil in combination with related peripheral components. The signal processing circuit can be used to process the received current signal and determine the information carried by the current signal or other information corresponding to the current signal. In this embodiment, the signal processing circuit can be composed of a chip such as a single-chip microcomputer and an ARM, and the chip within the signal processing circuit includes a signal processing program. The drive circuit is a circuit for outputting a drive signal to drive the IGBT. The drive circuit includes a driver that can output a drive signal of a certain voltage value.

[0086] In a specific implementation, the current detection circuit can detect the current current signal of the load end, i.e., the output end of the IGBT, and send the detected current current signal to the signal processing circuit; the signal processing circuit can use a relevant program or software algorithm to determine the current drive gear of the IGBT through a preset mapping relationship based on the current current signal, and output a drive gear signal corresponding to the current drive gear to the drive circuit; the drive circuit can adjust the drive parameters of the driver according to the current drive gear in the drive gear signal, and use the adjusted driver to generate a current drive signal; and then send the current drive signal to the control end of the IGBT to drive the IGBT.

[0087] Among them, the current current signal refers to the current value collected in the load end at the current point in time. The preset mapping relationship is the mapping relationship between the preset current value of the load end and the drive gear. One of the drive gears can correspond to a load end current value I within a range. For example, when the current value of the load end is between 0 and 100A, the driving capability corresponding to a drive gear can be used to drive the IGBT; when the current value of the load end is between 100 and 200A, the driving capability corresponding to another drive gear is required to drive the IGBT. Adjusting the drive parameters refers to adjusting the IGBT driving rate by the current driving voltage, which can also be understood as adjusting the driving capability of the driver. The driving capabilities corresponding to different drive gears are not the same. The driving capability corresponding to the drive gear with a larger current value at the load end can make the collector-emitter voltage change rate greater than the driving capability corresponding to the drive gear with a smaller current value. Reference Figure 3 , Figure 3 It represents the gear distribution scheme of current changing from zero to amplitude within a current cycle. Figure 3 In the figure, four driving gears are used as an example for explanation. In this embodiment, the specific number of gears is not limited. When the current value I at the load end is small, the gear with the weakest driving capability is used. As the current value I at the load end increases, it switches to a gear with stronger driving capability, then the collector-emitter voltage change rate is increased to a relatively high and balanced value, and the turn-on loss is greatly reduced. The current driving gear refers to the driving gear corresponding to the current current signal at the load end. The signal representing the driving gear is an electrical signal including information related to the current driving gear. The voltage values ​​of the driving gear signals corresponding to different driving gears are not the same, and the signal processing unit can drive the driving capability currently required according to the voltage value of the driving gear signal.

[0088] It is understandable that the driving circuit can adjust the driving parameters of the driver by adjusting the variable driving resistance, driving current or the variable driving voltage in the driver. The function of adjusting the driving parameters of the driver can be implemented by hardware.

[0089] In this embodiment, a step-by-step driving method is provided. The method detects a current current signal at the load end through a current detection circuit and transmits the detected current current signal to a signal processing circuit. The signal processing circuit determines the current driving position of the IGBT using a preset mapping relationship based on the current current signal and outputs a driving position signal corresponding to the current driving position to the driving circuit. The driving circuit adjusts the driving parameters of the driver based on the current driving position in the driving position signal and generates a current driving signal using the adjusted driver. The driving circuit transmits the current driving signal to the control terminal of the IGBT to drive the IGBT. In this embodiment, the current driving position of the IGBT is determined based on the collected current current signal, and the driving capability of the driver is adjusted based on the current driving position. Thus, when the load end current increases, the driving parameters of the driver are adjusted in steps to increase the collector-emitter voltage change, thereby effectively reducing the IGBT turn-on loss.

[0090] Reference Figure 9 , Figure 9 This is a flow chart of the second embodiment of the gear-shift driving method proposed in the present invention.

[0091] In this embodiment, before step S10, the following steps are further included:

[0092] Step S11: collecting the current signal of the load end to determine the current range set of the load end;

[0093] Step S12: obtaining a preset number of driving gears;

[0094] Step S13: dividing the current range set by the preset number of driving gears to determine a preset mapping relationship between driving gears and currents.

[0095] It should be understood that before driving the IGBT, it is necessary to determine the mapping relationship between the current value at the load end and the drive gear, that is, the preset mapping relationship. The preset mapping relationship determines the drive gear according to the current value, and one gear corresponds to a current value within a range.

[0096] During the process of determining the preset mapping relationship, the current detection circuit 10 may collect all possible current signals at the load end to determine a set of current ranges at the load end; the signal processing circuit 20 may determine a preset number of drive gears, i.e., the number of gears into which the drive capability is divided. Once the number of gears is determined, the signal processing circuit 20 may divide the current range according to the preset number of drive gears to determine the preset mapping relationship between the drive gears and the currents.

[0097] Wherein, the step S12 includes:

[0098] Step S121: obtaining a set of collector-emitter voltage change rates of the IGBT;

[0099] Step S122: dividing the collector-emitter voltage change rate set into gears to obtain a preset number of driving gears.

[0100] It should be understood that, in the process of determining the mapping relationship, it is also necessary to determine the set corresponding to the collector-emitter voltage change rate, and then divide it according to the number information of the driving gears to obtain the preset number of driving gears.

[0101] In a specific implementation, all the change rates between the IGBT collector and emitter can be acquired to obtain a collector-emitter voltage change rate set, and then the collector-emitter voltage change rate set can be divided according to the number of driving gears required to obtain a preset number of driving gears.

[0102] The step S121 includes:

[0103] Step S1211: Obtaining a limit value or a limit range of electromagnetic interference in the current environment;

[0104] Step S1212: determining a set of collector-emitter voltage change rates of the IGBT according to the limit value or the limit range of the electromagnetic interference.

[0105] It should be understood that the rate of change of the collector-emitter voltage of an IGBT must meet the EMI requirements of the environment. A greater rate of change in the collector-emitter voltage also corresponds to greater EMI. Certain EMI limits exist within the driving environment of the IGBT. These EMI limits can be either a maximum limit or a maximum limit range. For example, in applications with strict EMI requirements, the EMI limit is typically a specific limit; in less stringent EMI requirements, a maximum limit range can be used.

[0106] In this embodiment, the signal processing circuit further needs to determine a maximum limit value or maximum limit range of electromagnetic interference in the current environment. Based on the maximum limit value or maximum limit range of electromagnetic interference, the maximum value or maximum range of the collector-emitter voltage change rate of the IGBT is determined by using the positive correlation between electromagnetic interference and the collector-emitter voltage change rate. This maximum value or maximum range value is a collector-emitter voltage change rate set. The collector-emitter voltage change rate set is then divided into gears to obtain a preset number of drive gears. The specific number of drive gears can be divided multiple times using the collector-emitter voltage change rate set, and the IGBT is then driven and tested using each divided drive gear until the optimal number of gears is determined.

[0107] Reference Figure 10 , Figure 10The third embodiment of the shift-position driving method of the present invention is a flow chart of the third embodiment of the shift-position driving method of the present invention. The third embodiment of the shift-position driving method of the present invention is proposed based on the first embodiment or the second embodiment of the shift-position driving method.

[0108] In this embodiment, after step S10, the following steps are further included:

[0109] Step S50: predicting the next cycle current signal of the load end according to the current current signal and the previous cycle current signal;

[0110] Step S60: taking the next cycle current signal as the current current signal, and returning to the step of determining the current driving gear of the IGBT through a preset mapping relationship according to the current current signal.

[0111] It should be understood that there is a delay time between the current detection circuit detecting the current signal and the driver in the drive circuit acting on the IGBT. In order to compensate for this delay time, an advance prediction function, namely the delay compensation strategy, is added to the software. The current size at the next turn-on moment is predicted in advance based on the detected current value, and the drive gear is determined based on the predicted current value. This strategy needs to ensure that the hardware circuit delay and software processing delay meet a certain delay time, that is, the total delay time is less than the carrier frequency cycle. Since the changes in current values ​​within different cycles have certain regularity, for example, when the current value changes as a sinusoidal change, when a current value is collected, the current value at the next time point can be predicted based on the change of the sine wave.

[0112] In a specific implementation, the signal processing circuit can predict the next cycle current signal of the load end based on the current signal and the current signal of the previous cycle; then determine the next cycle drive gear of the IGBT through a preset mapping relationship based on the current signal of the next cycle, and output the drive gear signal corresponding to the next cycle drive gear to the drive circuit, thereby realizing the drive delay compensation of the IGBT.

[0113] In this embodiment, after the IGBT driving is completed, the next cycle current signal is predicted, and the driving gear is determined using the predicted current signal to drive the IGBT, effectively avoiding the driving delay of the IGBT.

[0114] To achieve the above objectives, an embodiment of the present invention further provides a storage medium, on which a shift position driving program is stored. When the shift position driving program is executed by a processor, the steps of the shift position driving method described above are implemented.

[0115] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A gear-shift drive system, characterized in that: The shift-position drive system includes: a current detection circuit, a signal processing circuit and a drive circuit; The current detection circuit is connected to the signal processing circuit and the load end respectively, and the drive circuit is connected to the signal processing circuit and the control end of the IGBT respectively; The current detection circuit is used to detect the current current signal of the load end and send the detected current current signal to the signal processing circuit; The signal processing circuit is configured to determine a current driving gear of the IGBT according to the current current signal through a preset mapping relationship, and output a driving gear signal corresponding to the current driving gear to the driving circuit; The driving circuit is configured to adjust a driving parameter of the driver according to the current driving gear position in the signal representing the driving gear position, and generate a current driving signal using the adjusted driver; The driving circuit is further configured to send the current driving signal to the control terminal of the IGBT to drive the IGBT; The current detection circuit is further used to collect the current signal of the load end to determine the current range set of the load end; The signal processing circuit is further used to obtain a preset number of driving gears; The signal processing circuit is further configured to divide the current range according to the preset number of driving gears to determine a preset mapping relationship between driving gears and currents.

2. The shift-position drive system according to claim 1, wherein: The signal processing circuit is further used to obtain a maximum limit value or a maximum limit range of electromagnetic interference in the current environment; The signal processing circuit is further configured to determine a set of collector-emitter voltage change rates of the IGBT according to a maximum limit value or a maximum limit range of the electromagnetic interference; The signal processing circuit is further configured to divide the collector-emitter voltage change rate set into gears to obtain a preset number of driving gears.

3. The shift-position drive system according to claim 2, wherein: The signal processing circuit is further configured to predict the next cycle current signal of the load end based on the current signal and the previous cycle current signal; The signal processing circuit is further used to determine the driving gear of the IGBT in the next cycle through a preset mapping relationship according to the current signal of the next cycle, and output a driving gear signal corresponding to the driving gear of the next cycle to the driving circuit.

4. A shift position driving method based on the shift position driving system according to any one of claims 1 to 3, characterized in that: The shift-position driving method includes: Detect the current signal at the load end; Determining a current driving gear of the IGBT through a preset mapping relationship according to the current current signal; Adjusting the driving parameters of the driver according to the current driving gear, and generating a current driving signal using the adjusted driver; The current driving signal is sent to the control terminal of the IGBT to drive the IGBT.

5. The shift-position driving method according to claim 4, wherein: Before the step of detecting the current signal at the load end, the method further includes: Collecting the current signal of the load end to determine the current range set of the load end; Obtaining a preset number of drive gears; The current range set is divided according to the preset number of driving gears to determine a preset mapping relationship between driving gears and currents.

6. The shift-position driving method according to claim 5, characterized in that: The step of obtaining a preset number of driving gears includes: Obtaining a set of collector-emitter voltage change rates of the IGBT; The collector-emitter voltage change rate set is divided into gears to obtain a preset number of driving gears.

7. The shift-position driving method according to claim 6, wherein: The step of obtaining a set of collector-emitter voltage change rates of the IGBT comprises: Obtain the limit value or limit range of electromagnetic interference in the current environment; A set of collector-emitter voltage change rates of the IGBT is determined according to a limit value or a limit range of the electromagnetic interference.

8. The shift-position driving method according to claim 4, wherein: After the step of detecting the current signal at the load end, the method further includes: Predicting the next cycle current signal of the load end according to the current current signal and the previous cycle current signal; The next cycle current signal is used as the current current signal, and the process returns to the step of determining the current driving gear of the IGBT through a preset mapping relationship according to the current current signal.

9. A storage medium, characterized in that: The storage medium stores a shift position driving program, which, when executed by the processor, implements the steps of the shift position driving method according to any one of claims 4 to 8.

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