Driving circuit, driving system and vehicle

Abstract

The utility model discloses a driving circuit, a driving system and a vehicle, the driving circuit comprises a driving module, the driving module comprises a driver chip with dynamic programmable driving intensity and a plurality of driving branches, the first end of each driving branch is respectively connected with the driver chip, and the second end of each driving branch is connected with a power device; the voltage detection module is connected with the power device and is used for detecting a voltage value between the grid electrode of the power device and the source electrode of the power device; the control module is connected with the voltage detection module and the driver chip, and the control module is used for controlling any driving branch to be switched on to drive the power device when the voltage value is determined not to be within the Miller platform voltage range, and controlling any driving branch to be switched on to drive the power device when the voltage value is determined to be within the Miller platform voltage range. And controlling the plurality of driving branches to be switched on at the same time to drive the power device. The driving circuit can effectively accelerate the process of the Miller platform period, shorten the duration of the Miller platform, further reduce the switching time of a power device and improve the system efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductors, in particular to a drive circuit, a drive system and a vehicle. Background Art

[0002] In the related technology, the energy of electric vehicles is provided by high-voltage batteries, and the power module composed of power devices IGBT (Insulated Gate Bipolar Transistor) or SiC MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) converts its direct current into three-phase alternating current to drive the motor. The switching state of the power device in the power module is controlled by the drive signal sent by the microprocessor in the motor control system after being isolated and amplified by the drive circuit composed of the gate driver and related components. That is, the drive circuit converts the drive signal sent by the microprocessor into a high-voltage, high-current pulse to control the gate of the IGBT or MOSFET to turn it on or off.

[0003] However, due to the existence of Miller capacitance in power devices, there is a Miller platform in the shutdown process and the turn-on process of the power devices. The power devices will generate losses due to the overlap of voltage and current during switching transients. The Miller platform period prolongs the switching time and increases the loss. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a driving circuit, which can effectively accelerate the process of the Miller platform period, shorten the duration of the Miller platform, and thus reduce the switching time of the power device and improve the system efficiency.

[0005] A second purpose of the present invention is to provide a driving system.

[0006] A third object of the present invention is to provide a vehicle.

[0007] In order to solve the above problems, the first aspect of the utility model provides a driving circuit, including: a driving module, the driving module includes a driver chip with dynamically programmable driving strength and multiple driving branches, the first end of each driving branch is respectively connected to the driver chip, and the second end of each driving branch is connected to a power device; a voltage detection module, the voltage detection module is connected to the power device and is used to detect the voltage value between the gate of the power device and the source of the power device; a control module, the control module is connected to the voltage detection module and the driver chip, the control module is used to control any one driving branch to be turned on to drive the power device when it is determined that the voltage value is not within the Miller platform voltage range, and when it is determined that the voltage value is within the Miller platform voltage range, control the multiple driving branches to be turned on at the same time to drive the power device.

[0008] According to the driving circuit of the embodiment of the utility model, based on the setting of multiple driving branches and the characteristic of the driver chip with real-time variable driving strength, the control module controls the driver chip to change the driving strength according to different voltage values, thereby prompting different driving branches to be turned on to change the driving current of the power device. In particular, when it is determined that the voltage value is within the Miller platform voltage range, multiple driving branches are controlled to be turned on at the same time to drive the power device, thereby increasing the driving current of the power device, thereby effectively accelerating the progress of the Miller platform period, shortening the duration of the Miller platform, reducing the switching time of the power device, and improving the system efficiency.

[0009] In some embodiments, the driver chip includes a PWM signal receiving end, multiple drive input ends and multiple drive output ends, each drive output end is connected to the first end of each drive branch in a one-to-one correspondence; the control module includes a PWM signal output end and multiple drive control ends, the PWM signal output end is connected to the PWM signal receiving end, each drive control end is connected to each drive input end in a one-to-one correspondence, the PWM signal output end is used to output the PWM signal sent by the control module, and the drive control end is used to output a level control signal, and the level control signal is used to indicate the conduction number of the drive branches.

[0010] In some embodiments, the driver chip is a UCC5880-Q1 gate driver chip.

[0011] In some embodiments, each driving branch includes: a driving resistor, a first end of the driving resistor is connected to the driving output end, and a second end of the driving resistor is connected to the gate of the power device.

[0012] In some embodiments, the plurality of drive output terminals include a first drive output terminal and a second drive output terminal; the plurality of drive branches include a first drive branch and a second drive branch, the first drive branch includes a first drive resistor, the second drive branch includes a second drive resistor, the first end of the first drive resistor is connected to the first drive output terminal, the first end of the second drive resistor is connected to the second drive output terminal, the second end of the first drive resistor is connected to the second end of the second drive resistor to form a connection point, and the connection point is connected to the gate of the power device.

[0013] In some embodiments, the control module includes an AD conversion end; the voltage detection module includes an isolation chip and a differential amplifier unit, the output end of the isolation chip is connected to the AD conversion end, the input end of the isolation chip is connected to the output end of the differential amplifier unit, the first input end of the differential amplifier unit is connected to the gate of the power device, and the second input end of the differential amplifier unit is connected to the source of the power device.

[0014] In some embodiments, the differential amplification unit includes: an operational amplifier, the output end of the operational amplifier is connected to the input end of the isolation chip; a first resistor, the first end of the first resistor is connected to the gate of the power device, and the second end of the first resistor is connected to the first input end of the operational amplifier; a second resistor, the first end of the second resistor is connected to the second end of the first resistor and the first input end of the operational amplifier, and the second end of the second resistor is connected to the ground end of the driver chip; a third resistor, the first end of the third resistor is connected to the source of the power device, and the second end of the third resistor is connected to the second input end of the operational amplifier; a fourth resistor, the first end of the fourth resistor is connected to the second end of the third resistor and the second input end of the operational amplifier, and the second end of the fourth resistor is connected to the output end of the operational amplifier.

[0015] A second aspect of the present invention provides a driving system, including: a power device; and the driving circuit described in the above embodiment, wherein the driving circuit is used to drive the power device to turn on or off.

[0016] According to the drive system of the embodiment of the utility model, the use of the above-mentioned drive circuit can effectively accelerate the process of the Miller platform period, shorten the duration of the Miller platform, and thus reduce the switching time of the power device and improve the system efficiency.

[0017] In some embodiments, the power device is an IGBT or a MOSFET.

[0018] A third aspect of the present invention provides a vehicle, comprising the drive system described in the above embodiment.

[0019] According to the vehicle of the embodiment of the utility model, the above-mentioned drive system is adopted, which can effectively accelerate the progress of the Miller platform period, shorten the duration of the Miller platform, and thus reduce the switching time of the power device and improve the system efficiency.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a schematic diagram of the voltage and current curves during the conduction process of the power device;

[0023] Figure 2 is a structural block diagram of a driving circuit according to an embodiment of the utility model;

[0024] Figure 3 is a topological schematic diagram of a driving circuit according to an embodiment of the utility model;

[0025] Figure 4 is a topological schematic diagram of a driving circuit according to another embodiment of the utility model;

[0026] Figure 5 It is a structural block diagram of a driving system according to an embodiment of the utility model.

[0027] Figure 6 It is a structural block diagram of a vehicle according to an embodiment of the utility model.

[0028] Reference numerals:

[0029] Vehicle 2000; drive system 1000;

[0030] Driving circuit 100; power device 200;

[0031] Driving module 10; voltage detection module 20; control module 30; first driving branch 101; second driving branch 102;

[0032] Driver chip 1; Isolation chip 2; Differential amplifier unit 3;

[0033] A first driving resistor Ron; a second driving resistor R'on; a first resistor R1; a second resistor R2; a third resistor R3; a fourth resistor R4; and an operational amplifier U1. DETAILED DESCRIPTION

[0034] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0035] IGBT and MOSFET are voltage-controlled devices, and their driving methods are different from those of current-controlled devices such as triodes. However, they actually also require current during the switching process. Taking MOSFET as an example, because there are parasitic capacitances Cgd, Cgs, and Cds between each pole, the MOSFET conduction condition is that the Vgs voltage reaches at least the threshold voltage Vgs (th), which is achieved by charging the Cgs capacitance through the gate charge. When the MOS tube is fully turned on, it is not necessary to provide current to it. The three parasitic capacitance parameter values ​​are generally given in the specification book in the form of input capacitance Ciss, output capacitance Coss, and reverse transfer capacitance Crss, and the corresponding relationship is: Ciss = Cgs + Cgd, Coss = Cds + Cgd, Crss = Cgd, and Cgd is the Miller capacitance.

[0036] During the charging process of the MOSFET gate, Vgs increases with the increase of gate charge at the beginning, but when Vgs increases to the Miller platform voltage, even if the gate charge continues to increase, Vgs remains unchanged because the increased gate charge is used to charge the Cgd capacitor. When the MOS tube is cut off, the drain voltage charges Cgd, and the voltage polarity of Cgd is positive at the top and negative at the bottom; when the MOS tube enters the Miller platform, most of the gate charge is used to charge Cgd, but the polarity is opposite to the drain charge, so it can also be understood as a reverse discharge of Cgd, which eventually makes the Vgd voltage change from negative to positive. When the condition of Vgs-Vgs(th)>Uds is reached, the Miller platform period of the MOS tube ends. In the Miller platform interval, Vds continues to decrease, and the duration of the Miller platform is the time for the Vds voltage to drop from the maximum value to the minimum value. It can be seen that the Miller platform time is positively correlated with the size of the capacitor Cgd.

[0037] The gate drive process can be understood as the charging and discharging process of the gate driver on the input capacitance of the power device, such as Figure 1As shown, during the turn-on process of MOSFET, the gate drive current Ig continues to decrease. When the gate-source voltage Vgs reaches the turn-on voltage threshold Vgs(th), MOSFET will enter the turn-on state, the drain-source voltage Vds begins to decrease, and the drain current Id begins to rise. However, after Vgs rises to the Miller platform voltage Va, it will continue to rise for a period of time, and the gate drive current Ig remains basically unchanged. At this time, Id has reached the maximum, and Vds continues to decrease until the Miller capacitor is fully charged. Vgs continues to rise to the value of the drive voltage Vgg, and the gate drive current Ig drops to zero. At this time, MOSFET enters the saturation region, Vds drops completely, and the turn-on process ends. Therefore, since the Miller capacitor prevents the rise of Vgs, it also prevents the decline of Vds, which causes the loss time to be prolonged and increases the loss.

[0038] The following describes a driving circuit according to an embodiment of the utility model with reference to the accompanying drawings. Figure 2 and Figure 3 As shown, the driving circuit 100 includes a driving module 10 , a voltage detection module 20 and a control module 30 .

[0039] Among them, Figure 2 As shown in or 3, the driving module 10 includes a driver chip 1 with dynamically programmable driving strength and multiple driving branches such as a first driving branch 101 and a second driving branch 102, the first end of each driving branch is respectively connected to the driver chip 1, and the second end of each driving branch is connected to the power device 200, that is, the multiple driving branches are connected in parallel with each other; the voltage detection module 20 is connected to the power device 200, and is used to detect the voltage value between the gate of the power device 200 and the source of the power device 200; the control module 30 is connected to the voltage detection module 20 and the driver chip 1, and the control module 30 is used to control any driving branch to be turned on to drive the power device 200 when it is determined that the voltage value is not within the Miller platform voltage range, and when it is determined that the voltage value is within the Miller platform voltage range, control multiple driving branches to be turned on at the same time to drive the power device 200.

[0040] Specifically, in order to solve the problem that the Miller platform period prolongs the switching time of the power device and increases the loss, the present application sets a plurality of drive branches to connect the driver chip 1 and the power device 200. Based on this, during the switching process of the power device 200, the voltage value between the gate of the power device 200 and the source of the power device 200 is detected by the voltage detection module 20 to obtain the Miller platform voltage range, so that the control module 30 drives and controls the driver module 10 based on the voltage value and the Miller platform voltage range, and based on the characteristic that the driver chip 1 has real-time variable drive strength, the control module 30 can control the driver chip 1 to change the drive strength according to different voltage values, thereby prompting different drive branches to be turned on to change the power device 20. 0 driving current, specifically, when it is determined that the voltage value is not within the Miller platform voltage range, any driving branch is controlled to be turned on to drive the power device 200, that is, when it is not in the Miller platform period, the control module 30 controls the driving strength output by the driver chip 1 according to the current voltage value to only turn on one driving branch, and the power device 200 is driven by the one driving branch; and when it is determined that the voltage value is within the Miller platform voltage range, multiple driving branches are controlled to be turned on at the same time to drive the power device 200, that is, when it is in the Miller platform period, the control module 30 controls the driving strength output by the driver chip 1 according to the current voltage value to turn on multiple driving branches, and the multiple driving branches jointly drive the power device 200. Therefore, multiple drive branches only work simultaneously during the Miller platform period, and only one drive branch works in other time periods, which will not affect the circuit operation. Therefore, during the Miller platform period, multiple drive branches jointly provide drive current for the gate of the power device 200, which can effectively accelerate the progress of the Miller platform period, shorten the duration of the Miller platform, and thereby reduce the switching time of the power device 200, improve system efficiency, and the present application requires fewer components and low cost, and has no impact on the circuit function outside the Miller platform period.

[0041] The multiple driving branches may be two, three or more, and there is no limitation on this. The control module 30 may control some or all driving branches to be turned on according to actual needs, so as to change the driving current of the power device 200, accelerate the process of the Miller platform period, and shorten the duration of the Miller platform.

[0042] According to the driving circuit 100 of the embodiment of the utility model, based on the setting of multiple driving branches and the characteristic of the driver chip 1 having real-time variable driving strength, the control module 30 controls the driver chip 1 to change the driving strength for different voltage values, thereby prompting different driving branches to be turned on to change the driving current of the power device 200. In particular, when it is determined that the voltage value is within the Miller platform voltage range, multiple driving branches are controlled to be turned on at the same time to drive the power device 200, thereby increasing the driving current of the power device 200, thereby effectively accelerating the progress of the Miller platform period, shortening the duration of the Miller platform, reducing the switching time of the power device, and improving the system efficiency.

[0043] In some embodiments, reference Figure 3 As shown, the driving chip 1 includes a PWM signal receiving terminal INP, multiple driving input terminals and multiple driving output terminals; the control module 30 includes a PWM signal output terminal PH and multiple driving control terminals.

[0044] Among them, each driving output terminal is connected to the first end of each driving branch in a one-to-one correspondence; the PWM signal output terminal PH is connected to the PWM signal receiving terminal INP, and each driving control terminal is connected to each driving input terminal in a one-to-one correspondence. The PWM signal output terminal PH is used to output the PWM signal sent by the control module 30, that is, the PWM signal output terminal PH is a signal output terminal for controlling the power device 200 to be turned on or off, and the driving control terminal is used to output a level control signal, and the level control signal is used to indicate the number of driving branches that are turned on.

[0045] Specifically, when controlling the power device 200 to be turned on, the control module 30 sends a PWM signal through the PWM signal output terminal PH, and the driving module 10 will start the device turning-on procedure upon receiving the PWM signal. At the same time, the control module 30 controls the multiple driving control terminals to output corresponding level control signal combinations to each driving input terminal according to the voltage value. That is to say, different level output combinations of the multiple driving control terminals can enable different combinations of each driving output terminal, so as to control whether different driving branches are turned on or not, thereby indicating the number of driving branches turned on.

[0046] For example, when the voltage value is not within the Miller platform voltage range, the control module 30 controls the level control signal output by any of the multiple drive control terminals to be high level according to the voltage value, and controls the level control signals output by all the other drive control terminals except any one of the drive control terminals to be low level, and sends the above level control signal combination to each drive input terminal, so as to control any drive branch corresponding to any drive control terminal to be turned on, so as to provide drive current for the power device 200, start the conduction process, and other drive branches are disconnected. When the voltage value is within the Miller platform voltage range, the control module 30 controls the level control signal output by each drive control terminal to be high level according to the voltage value, and sends the above level control signal combination to each drive input terminal, so as to control each drive branch to be turned on, so as to jointly provide drive current for the power device 200, start the conduction process, and effectively accelerate the process of the Miller platform period, shorten the duration of the Miller platform, reduce the switching time of the power device, and improve the system efficiency.

[0047] In some embodiments, the driver chip 1 is a UCC5880-Q1 gate driver chip.

[0048] In some embodiments, reference Figure 3 As shown, each driving branch includes a driving resistor.

[0049] The first end of the driving resistor is connected to the driving output end, and the second end of the driving resistor is connected to the gate of the power device 200 .

[0050] In some embodiments, reference Figure 3 As shown, the plurality of driving output terminals include a first driving output terminal OUTH1 and a second driving output terminal OUTH2; the plurality of driving branches include a first driving branch 101 and a second driving branch 102, the first driving branch 101 includes a first driving resistor Ron, and the second driving branch 102 includes a second driving resistor R'on.

[0051] Among them, the first end of the first driving resistor Ron is connected to the first driving output terminal OUTH1, the first end of the second driving resistor R'on is connected to the second driving output terminal OUTH2, the second end of the first driving resistor Ron is connected to the second end of the second driving resistor R'on to form a connection point, and the connection point is connected to the gate of the power device 200.

[0052] Exemplary, reference Figure 3As shown, the multiple driving input terminals are P*[2:0], i.e., three IO ports, and different output combinations thereof can enable different combinations of driving output terminals OUTH1 and OUTH2; and the multiple driving control terminals are GD*[2:0], which are three control terminals that enable different combinations of OUTH1 and OUTH2, and different combinations thereof can make the output of the driver chip 1 only OUTH1 valid, only OUTH2 valid, or both OUTH1 and OUTH2 valid. Based on the above content, when controlling the power device 200 to be turned on, the control module 30 sends a PWM signal through the PWM signal output terminal PH, and the driving module 10 will start the device turning-on procedure upon receiving the PWM signal. At the same time, the control module 30 controls the multiple driving control terminals to output corresponding level control signal combinations to each driving input terminal according to the voltage value, that is, different level output combinations of the multiple driving control terminals can enable different combinations of each driving output terminal, thereby correspondingly controlling whether different driving branches are turned on.

[0053] For example, when the voltage value is not within the Miller platform voltage range, the control module 30 controls the level control signal output by the drive control terminal corresponding to the first drive output terminal OUTH1 to be high level according to the voltage value, and controls the level control signal output by the second drive output terminal OUTH2 to be low level, and sends the above-mentioned level control signal combination to each drive input terminal, that is, only OUTH1 is valid, so that the drive circuit where the first drive output terminal OUTH1 is located, that is, the first drive branch 101, can be controlled to be turned on to provide a drive current for the power device 200 and start the conduction process, while the drive circuit where the second drive output terminal OUTH2 is located, that is, the second drive branch 102, is disconnected. When the voltage value is within the Miller platform voltage range, the control module 30 controls the level control signal output by each drive control terminal to be high level according to the voltage value, and sends the above-mentioned level control signal combination to each drive input terminal, that is, OUTH1 and OUTH2 are both valid, thereby controlling the first drive branch 101 and the second drive branch 102 to be turned on at the same time, so as to jointly provide drive current for the power device 200, start the conduction process, and effectively accelerate the progress of the Miller platform period, shorten the duration of the Miller platform, reduce the switching time of the power device, and improve the system efficiency.

[0054] Then, as the Miller plateau phase exits, the driving input terminal P*[2:0] of the control module 30 outputs a corresponding level combination, and the driving circuit where the first driving output terminal OUTH1 is located, i.e., the first driving branch 101, is turned on through the driving control terminal GD*[2:0], while the driving circuit where the second driving output terminal OUTH2 is located, i.e., the second driving branch 102, is turned off, and only the driving circuit where the first driving output terminal OUTH1 is located provides driving current for the gate of the power device 200. Thus, the above steps can be repeated to accelerate the Miller plateau process during the turn-on period.

[0055] In some embodiments, reference Figure 4 As shown, the control module 30 includes an AD conversion terminal, and the voltage detection module 20 includes an isolation chip 2 and a differential amplifier unit 3.

[0056] Among them, the output end of the isolation chip 2 is connected to the AD conversion end, the input end of the isolation chip 2 is connected to the output end of the differential amplifier unit 3, the first input end of the differential amplifier unit 3 is connected to the gate of the power device 200, and the second input end of the differential amplifier unit 3 is connected to the source of the power device 200.

[0057] Specifically, when the driving power device 200 is turned on, the differential amplifier unit 3 detects the voltage value between the gate and the source of the power device 200, that is, Vgs. The voltage value enters the isolation chip 2 and is sent to the control module 30. The AD conversion end of the control module 30 detects Vgs and calculates the Vgs voltage change rate dv / dt. Because the voltage change rate of Vgs during the Miller platform is much smaller than that in other time periods, the Miller platform voltage range can be obtained.

[0058] It should be noted that when the operating conditions of the control module 30 change, for example, when the temperature of the power device rises or falls, the Miller platform voltage range may change. Therefore, the Vgs voltage value detected by the AD conversion end should be used to timely reconfirm the Miller platform voltage range, i.e., the upper and lower limit voltage values ​​of the Miller platform, so that the relevant circuits can better serve the Miller platform period.

[0059] In addition, after several detection cycles, the control module 30 can obtain a more accurate Miller platform voltage range, that is, the upper and lower limit voltage values ​​of the Miller platform. Therefore, when the working state of the control module 30 does not change, the Miller platform voltage range can no longer be detected to save the resource usage of the microprocessor.

[0060] In some embodiments, reference Figure 4 As shown, the differential amplification unit 3 includes an operational amplifier U1 , a first resistor R1 , a second resistor R2 , a third resistor R3 and a fourth resistor R4 .

[0061] Among them, the first end of the first resistor R1 is connected to the gate of the power device 200, and the second end of the first resistor R1 is connected to the first input terminal of the operational amplifier U1; the first end of the second resistor R2 is connected to the second end of the first resistor R1 and the first input terminal of the operational amplifier U1, and the second end of the second resistor R2 is connected to the ground terminal GND2 of the driver chip 1; the first end of the third resistor R3 is connected to the source of the power device 200, and the second end of the third resistor R3 is connected to the second input terminal of the operational amplifier U1; the first end of the fourth resistor R4 is connected to the second end of the third resistor R3 and the second input terminal of the operational amplifier U1, and the second end of the fourth resistor R4 is connected to the output terminal of the operational amplifier U1.

[0062] Specifically, refer to Figure 3 and Figure 4 As shown, during the conduction process of the power device 200, the differential amplifier unit 3 composed of the operational amplifier U1, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 continuously processes the gate-source voltage value Vgs according to the corresponding proportion. The voltage value Vgs is sent to the AD conversion end of the control module 30 through the isolation chip 2 for real-time detection, and the voltage change rate dv / dt of Vgs is calculated. Because the voltage change rate of Vgs during the Miller platform is much smaller than that in other time periods, the voltage values ​​of the upper and lower limits of the Miller platform, that is, the Miller platform voltage range, can be obtained.

[0063] Furthermore, if the gate-source voltage value Vgs of the power device 200 output by the differential amplifier unit 3 is within the Miller platform voltage range, that is, Vgs is in the Miller platform interval, the control signal output terminal PH of the control module 30 outputs a PWM signal. After the drive module 10 receives it, the drive chip 1 prompts both OUTH1 and OUTH2 to be effective based on the level control signal combination provided by the control module 30, thereby controlling the first drive branch 101 and the second drive branch 102 to be turned on at the same time, and jointly providing a drive current for the gate of the power device 200, thereby accelerating the process of the Miller platform period and shortening the platform time.

[0064] With the exit from the Miller platform period, the gate-source voltage value Vgs of the power device 200 output by the differential amplifier unit 3 exceeds the Miller platform voltage range. The driver chip 1 causes only OUTH1 to be effective based on the level control signal combination provided by the control module 30, and the second drive branch 102 is disconnected. Only the first drive branch 101 provides drive current for the gate of the power device 200.

[0065] The second embodiment of the utility model provides a drive system, referring to Figure 5 As shown, the driving system 1000 includes a power device 200 and a driving circuit 100 .

[0066] The driving circuit 100 is used to drive the power device 200 to turn on or off.

[0067] According to the drive system 1000 of the embodiment of the utility model, the above-mentioned drive circuit 100 is adopted, which can effectively accelerate the process of the Miller platform period, shorten the duration of the Miller platform, and thus reduce the switching time of the power device 200 and improve the system efficiency.

[0068] In some embodiments, the power device is an IGBT or a MOSFET.

[0069] The third aspect of the utility model provides a vehicle, referring to Figure 6 As shown, vehicle 2000 includes drive system 1000 .

[0070] According to the vehicle 2000 of the embodiment of the utility model, the above-mentioned drive system 1000 is adopted, which can effectively accelerate the progress of the Miller platform period, shorten the duration of the Miller platform, and thus reduce the switching time of the power device 200 and improve the system efficiency.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A driving circuit, characterized in that: include: A driving module, the driving module comprising a driver chip with dynamically programmable driving strength and a plurality of driving branches, a first end of each driving branch being connected to the driver chip, and a second end of each driving branch being connected to a power device; A voltage detection module, the voltage detection module is connected to the power device and is used to detect a voltage value between a gate of the power device and a source of the power device; A control module, wherein the control module is connected to the voltage detection module and the driver chip, and the control module is used to control any one of the drive branches to be turned on to drive the power device when it is determined that the voltage value is not within the Miller platform voltage range, and to control the multiple drive branches to be turned on simultaneously to drive the power device when it is determined that the voltage value is within the Miller platform voltage range.

2. The driving circuit according to claim 1, characterized in that: The driver chip comprises a PWM signal receiving end, a plurality of driving input ends and a plurality of driving output ends, each driving output end being connected to the first end of each driving branch in a one-to-one correspondence; The control module includes a PWM signal output terminal and multiple drive control terminals, the PWM signal output terminal is connected to the PWM signal receiving terminal, each drive control terminal is connected to each drive input terminal in a one-to-one correspondence, the PWM signal output terminal is used to output the PWM signal sent by the control module, and the drive control terminal is used to output a level control signal, and the level control signal is used to indicate the conduction number of the drive branches.

3. The driving circuit according to claim 2, characterized in that: The driver chip is a UCC5880-Q1 gate driver chip.

4. The driving circuit according to claim 2, characterized in that: Each drive branch includes: A driving resistor, wherein a first end of the driving resistor is connected to the driving output end, and a second end of the driving resistor is connected to the gate of the power device.

5. The driving circuit according to claim 2, characterized in that: The plurality of drive output terminals include a first drive output terminal and a second drive output terminal; The multiple driving branches include a first driving branch and a second driving branch, the first driving branch includes a first driving resistor, the second driving branch includes a second driving resistor, the first end of the first driving resistor is connected to the first driving output end, the first end of the second driving resistor is connected to the second driving output end, the second end of the first driving resistor is connected to the second end of the second driving resistor to form a connection point, and the connection point is connected to the gate of the power device.

6. The driving circuit according to any one of claims 1 to 5, characterized in that: The control module includes an AD conversion terminal; The voltage detection module includes an isolation chip and a differential amplifier unit, the output end of the isolation chip is connected to the AD conversion end, the input end of the isolation chip is connected to the output end of the differential amplifier unit, the first input end of the differential amplifier unit is connected to the gate of the power device, and the second input end of the differential amplifier unit is connected to the source of the power device.

7. The driving circuit according to claim 6, characterized in that: The differential amplification unit comprises: An operational amplifier, wherein an output terminal of the operational amplifier is connected to an input terminal of the isolation chip; a first resistor, wherein a first end of the first resistor is connected to a gate of the power device, and a second end of the first resistor is connected to a first input end of the operational amplifier; a second resistor, wherein a first end of the second resistor is connected to a second end of the first resistor and a first input end of the operational amplifier, and a second end of the second resistor is connected to a ground end of the driver chip; a third resistor, wherein a first end of the third resistor is connected to the source of the power device, and a second end of the third resistor is connected to the second input end of the operational amplifier; A fourth resistor, wherein a first end of the fourth resistor is connected to the second end of the third resistor and the second input end of the operational amplifier, and a second end of the fourth resistor is connected to the output end of the operational amplifier.

8. A drive system, characterized in that: include: Power devices; The drive circuit according to any one of claims 1 to 7, wherein the drive circuit is used to drive the power device to turn on or off.

9. The drive system according to claim 8, characterized in that: The power device is an IGBT or a MOSFET.

10. A vehicle, characterized in that: Comprising the drive system as claimed in claim 8 or 9.

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