Switching tube off negative pressure determination method and device and switching tube driving control circuit

Abstract

The application discloses a switch tube off negative voltage determination method and device and a switch tube driving control circuit. The switch tube off negative voltage determination method comprises the following steps: determining a first off negative voltage model and a second off negative voltage model; inputting the obtained off gate resistance, on gate resistance, bus voltage and minimum on voltage of the switch tube into the first off negative voltage model to obtain an upper limit absolute value of the off negative voltage of the switch tube; inputting the obtained off gate resistance, on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second off negative voltage model to obtain a lower limit absolute value of the off negative voltage of the switch tube; and determining the off negative voltage interval of the switch tube according to the upper limit absolute value and the lower limit absolute value. When the off negative voltage interval is used for negative voltage off control of the switch tube, the switch tube can be effectively prevented from being mis-opened, the switch tube can be protected, and the service life of the switch tube is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inverters, and particularly relates to a method and device for determining the off negative voltage of a switching tube and a switching tube driving control circuit. BACKGROUND

[0002] With the gradual improvement of people's living standards, more and more vehicles enter thousands of households, providing convenience for people's travel. In the related art, in a high input voltage vehicle compressor inverter system, a silicon carbide MOS tube is used to reduce loss and improve inverter efficiency, but the silicon carbide MOS tube has the problem of easy misopening. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, a first object of the present application is to provide a method for determining the off negative voltage of a switching tube, which can accurately determine the off negative voltage range of the switching tube, thereby effectively preventing the switching tube from misopening when the off negative voltage range is used for negative voltage off control of the switching tube, and protecting the switching tube and prolonging the service life of the switching tube.

[0004] A second object of the present application is to provide a device for determining the off negative voltage of a switching tube

[0005] A third object of the present application is to provide an inverter.

[0006] A fourth object of the present application is to provide a computer readable storage medium.

[0007] A fifth object of the present application is to provide a switching tube driving control circuit.

[0008] A sixth object of the present application is to provide a motor control system.

[0009] A seventh object of the present application is to provide a compressor.

[0010] An eighth object of the present application is to provide a vehicle.

[0011] To achieve the above object, the first aspect of the present application provides a method for determining the off negative voltage of a switch tube, which comprises: determining a first off negative voltage model and a second off negative voltage model; obtaining the off gate resistance and the on gate resistance of the switch tube, obtaining the bus voltage, and obtaining the minimum on voltage and the maximum bearable negative voltage absolute value of the switch tube; inputting the off gate resistance, the on gate resistance, the bus voltage and the minimum on voltage into the first off negative voltage model to obtain the upper limit absolute value of the off negative voltage of the switch tube, and inputting the off gate resistance, the on gate resistance, the bus voltage and the maximum bearable negative voltage absolute value into the second off negative voltage model to obtain the lower limit absolute value of the off negative voltage of the switch tube; and determining the off negative voltage interval of the switch tube according to the upper limit absolute value and the lower limit absolute value.

[0012] The method for determining the off negative voltage of a switch tube according to the present application, by inputting the obtained off gate resistance, on gate resistance, bus voltage and minimum on voltage of the switch tube into the first off negative voltage model to obtain the upper limit absolute value of the off negative voltage of the switch tube, and inputting the obtained off gate resistance, on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second off negative voltage model to obtain the lower limit absolute value of the off negative voltage of the switch tube, and then determining the off negative voltage interval of the switch tube according to the upper limit absolute value and the lower limit absolute value, can effectively prevent the switch tube from being mistakenly turned on and protect the switch tube when the off negative voltage interval is used to control the negative voltage off of the switch tube, thereby prolonging the service life of the switch tube.

[0013] In some embodiments of the present application, the first off negative voltage model is expressed according to the following relationship: V SS_min = λ1*f1(R G_on , R G_off , V DC ) - V th , where V SS_min is the upper limit absolute value of the off negative voltage, λ1 is a first derating parameter, f1(R G_on , R G_off , V DC ) is a function expression corresponding to the first off negative voltage model, R G_on is the on gate resistance, R G_off is the off gate resistance, V DC is the bus voltage, and V th is the minimum on voltage.

[0014] In some embodiments of the present application, the second off negative voltage model is expressed according to the following relationship: VSS_max = V GS_max - λ2*f2(R G_on , R G_off , V DC ), wherein V SS_max is an absolute value of the lower limit of the turn-off negative voltage, λ2 is a second derating parameter, f2(R G_on , R G_off , V DC ) is a function expression corresponding to the second turn-off negative voltage model, R G_on is the on gate resistance, R G_off is the off gate resistance, V DC is the bus voltage, and V GS_max is an absolute value of the maximum bearable negative voltage.

[0015] In some embodiments of the present application, the turn-off negative voltage interval of the switch tube is determined according to the absolute value of the upper limit of the turn-off negative voltage and the absolute value of the lower limit of the turn-off negative voltage, including: taking the negative value of the absolute value of the upper limit of the turn-off negative voltage as an upper limit voltage of the turn-off negative voltage, and taking the negative value of the absolute value of the lower limit of the turn-off negative voltage as a lower limit voltage of the turn-off negative voltage; and determining the turn-off negative voltage interval according to the lower limit voltage of the turn-off negative voltage and the upper limit voltage of the turn-off negative voltage.

[0016] In some embodiments of the present application, the switch tube is a silicon carbide MOS tube.

[0017] To achieve the above object, a second aspect of the present application provides a device for determining a turn-off negative voltage of a switch tube, the device comprising: a first determination module configured to determine a first turn-off negative voltage model and a second turn-off negative voltage model; an acquisition module configured to acquire an off gate resistance and an on gate resistance of the switch tube, acquire a bus voltage, acquire a minimum on voltage of the switch tube, and acquire an absolute value of a maximum bearable negative voltage of the switch tube; and a second determination module configured to input the off gate resistance, the on gate resistance, the bus voltage, and the minimum on voltage into the first turn-off negative voltage model to obtain an absolute value of an upper limit of a turn-off negative voltage of the switch tube, input the off gate resistance, the on gate resistance, the bus voltage, and the absolute value of the maximum bearable negative voltage into the second turn-off negative voltage model to obtain an absolute value of a lower limit of the turn-off negative voltage of the switch tube, and determine a turn-off negative voltage interval of the switch tube according to the absolute value of the upper limit of the turn-off negative voltage and the absolute value of the lower limit of the turn-off negative voltage.

[0018] The switch tube off negative voltage determination device according to the embodiment of the present application, by inputting the obtained off gate resistance, on gate resistance, bus voltage and minimum on voltage of the switch tube into the first off negative voltage model, obtains the upper limit absolute value of the off negative voltage of the switch tube, and by inputting the obtained off gate resistance, on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second off negative voltage model, obtains the lower limit absolute value of the off negative voltage of the switch tube, and then according to the upper limit absolute value of the off negative voltage of the switch tube and the lower limit absolute value of the off negative voltage of the switch tube, accurately determines the off negative voltage interval of the switch tube, so that when the off negative voltage interval is used to control the negative voltage off of the switch tube, the switch tube can be effectively prevented from being mistakenly turned on, and the switch tube can be protected, and the service life of the switch tube is prolonged.

[0019] To achieve the above object, the third aspect of the present application provides an inverter, comprising a memory, a processor and a switch tube off negative voltage determination program stored in the memory and executable on the processor, when the processor executes the switch tube off negative voltage determination program, the switch tube off negative voltage determination method of any one of the above embodiments is realized.

[0020] The inverter according to the embodiment of the present application, by inputting the obtained off gate resistance, on gate resistance, bus voltage and minimum on voltage of the switch tube into the first off negative voltage model, obtains the upper limit absolute value of the off negative voltage of the switch tube, and by inputting the obtained off gate resistance, on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second off negative voltage model, obtains the lower limit absolute value of the off negative voltage of the switch tube, and then according to the upper limit absolute value of the off negative voltage of the switch tube and the lower limit absolute value of the off negative voltage of the switch tube, accurately determines the off negative voltage interval of the switch tube, so that when the off negative voltage interval is used to control the negative voltage off of the switch tube, the switch tube can be effectively prevented from being mistakenly turned on, and the switch tube can be protected, and the service life of the switch tube is prolonged.

[0021] To achieve the above object, the fourth aspect of the present application provides a computer readable storage medium, which stores a switch tube off negative voltage determination program, when the processor executes the switch tube off negative voltage determination program, the switch tube off negative voltage determination method of any one of the above embodiments is realized.

[0022] The computer readable storage medium according to the embodiment of the present application inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model to obtain an upper limit absolute value of the turn-off negative voltage of the switch tube, and inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model to obtain a lower limit absolute value of the turn-off negative voltage of the switch tube, and then accurately determines the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage interval is used to control the negative voltage turn-off of the switch tube, the switch tube can be effectively prevented from being turned on by mistake, and the switch tube can be protected, and the service life of the switch tube is prolonged.

[0023] To achieve the above object, the fifth aspect of the present application provides a switch tube driving control circuit, which comprises a driving power supply, a driving unit and a control unit, wherein the control unit executes the turn-off negative voltage determination method of any one of the above embodiments to obtain the turn-off negative voltage interval of the switch tube, and controls the driving power supply to provide a negative turn-off voltage to the driving unit according to the turn-off negative voltage interval; the driving unit is used to drive the switch tube to turn off according to the negative turn-off voltage when receiving a turn-off control signal.

[0024] The switch tube driving control circuit according to the embodiment of the present application inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model to obtain an upper limit absolute value of the turn-off negative voltage of the switch tube, and inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model to obtain a lower limit absolute value of the turn-off negative voltage of the switch tube, and then accurately determines the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage interval is used to control the negative voltage turn-off of the switch tube, the switch tube can be effectively prevented from being turned on by mistake, and the switch tube can be protected, and the service life of the switch tube is prolonged.

[0025] In some embodiments of the present application, the driving unit comprises a driving chip, a positive power supply pin of the driving chip is connected to a positive turn-on voltage providing end of the driving power supply, a negative power supply pin of the driving chip is connected to a negative turn-off voltage providing end of the driving power supply, an input pin of the driving chip is connected to the control unit to receive a turn-off control signal sent by the control unit, and a first gate resistance has one end connected to an output pin of the driving chip and the other end connected to a gate of the switch tube.

[0026] In some embodiments of the present application, the driving unit further comprises a first diode, a cathode of the first diode being connected to one end of the first gate resistor; a second gate resistor, one end of the second gate resistor being connected to an anode of the first diode, the other end of the second gate resistor being connected to the other end of the first gate resistor.

[0027] In some embodiments of the present application, the driving unit further comprises a second diode, a cathode of the second diode being connected to one end of the first gate resistor, an anode of the second diode being connected to a cathode of the first diode.

[0028] In some embodiments of the present application, the driving unit further comprises a first diode, a cathode of the first diode being connected to one end of the first gate resistor, an anode of the first diode being connected to the other end of the first gate resistor; a second gate resistor, one end of the second gate resistor being connected to the anode of the first diode, the other end of the second gate resistor being connected to a gate of the switch tube.

[0029] In some embodiments of the present application, the driving unit further comprises a first coupling capacitor, one end of the first coupling capacitor being connected to a positive forward-on voltage providing end of the driving power supply; a second coupling capacitor, one end of the second coupling capacitor being connected to the other end of the first coupling capacitor, the other end of the second coupling capacitor being connected to a negative forward-off voltage providing end of the driving power supply.

[0030] In some embodiments of the present application, when the switch tube is an upper bridge switch tube, a node between the first coupling capacitor and the second coupling capacitor is connected to a midpoint of a bridge arm where the upper bridge switch tube is located; when the switch tube is a lower bridge switch tube, the node between the first coupling capacitor and the second coupling capacitor is grounded.

[0031] To achieve the above object, the sixth aspect of the present application provides a motor control system, which comprises the switch tube driving control circuit according to any one of the above embodiments.

[0032] The motor control system according to the embodiment of the present application inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model to obtain the upper limit absolute value of the turn-off negative voltage of the switch tube, and inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model to obtain the lower limit absolute value of the turn-off negative voltage of the switch tube, and then accurately determines the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage interval is used to control the negative voltage turn-off of the switch tube, the switch tube can be effectively prevented from being turned on by mistake, and the switch tube can be protected to prolong the service life of the switch tube.

[0033] To achieve the above object, the seventh aspect of the present application provides a compressor comprising the motor control system described in the above embodiments.

[0034] The compressor according to the embodiment of the present application inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model to obtain the upper limit absolute value of the turn-off negative voltage of the switch tube, and inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model to obtain the lower limit absolute value of the turn-off negative voltage of the switch tube, and then accurately determines the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage interval is used to control the negative voltage turn-off of the switch tube, the switch tube can be effectively prevented from being turned on by mistake, and the switch tube can be protected to prolong the service life of the switch tube.

[0035] To achieve the above object, the eighth aspect of the present application provides a vehicle comprising the compressor described in the above embodiments.

[0036] The vehicle according to the embodiment of the present application inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model to obtain the upper limit absolute value of the turn-off negative voltage of the switch tube, and inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model to obtain the lower limit absolute value of the turn-off negative voltage of the switch tube, and then accurately determines the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage interval is used to control the negative voltage turn-off of the switch tube, the switch tube can be effectively prevented from being turned on by mistake, and the switch tube can be protected to prolong the service life of the switch tube.

[0037] Additional aspects and advantages of the present application will be apparent from the following description, taken in conjunction with the accompanying drawings, wherein: BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, taken in conjunction with the accompanying drawings, in which:

[0039] Figure 1 is a flowchart of a method for determining a turn-off negative voltage of a switch tube according to an embodiment of the present application;

[0040] Figure 2 is a scenario diagram of a method for determining a turn-off negative voltage of a switch tube according to an embodiment of the present application;

[0041] Figure 3 is a scenario diagram of a method for determining a turn-off negative voltage of a switch tube according to another embodiment of the present application;

[0042] Figure 4 is a flowchart of a method for determining a turn-off negative voltage of a switch tube according to another embodiment of the present application;

[0043] Figure 5 is a block diagram of a device for determining a turn-off negative voltage of a switch tube according to an embodiment of the present application;

[0044] Figure 6 is a block diagram of an inverter according to an embodiment of the present application;

[0045] Figure 7 is a block diagram of a switch tube driving control circuit according to an embodiment of the present application;

[0046] Figure 8 is a circuit diagram of a switch tube driving control circuit according to an embodiment of the present application;

[0047] Figure 9 is a circuit diagram of a switch tube driving control circuit according to another embodiment of the present application;

[0048] Figure 10 is a circuit diagram of a switch tube driving control circuit according to another embodiment of the present application;

[0049] Figure 11 is a circuit diagram of a switch tube driving control circuit according to another embodiment of the present application;

[0050] Figure 12 is a block diagram of a motor control system according to an embodiment of the present application;

[0051] Figure 13is a structural block diagram of a compressor according to an embodiment of the present application;

[0052] Figure 14 is a structural block diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein the same or like reference numerals are used to represent the same or similar elements throughout the several views. The embodiments described below are exemplary and are intended to explain the present application, and are not intended to limit the present application.

[0054] To clearly illustrate the switch tube turn-off negative pressure determination method, device and switch tube driving control circuit of the embodiments of the present application, the switch tube turn-off negative pressure determination method of the embodiments of the present application will be described below with reference to the flowchart of the switch tube turn-off negative pressure determination method shown in Figure 1 As shown in Figure 1 , the switch tube turn-off negative pressure determination method of the embodiments of the present application includes the following steps:

[0055] S11: determining a first turn-off negative pressure model and a second turn-off negative pressure model;

[0056] S13: obtaining the turn-off gate resistance and the turn-on gate resistance of the switch tube, obtaining the bus voltage, and obtaining the minimum turn-on voltage and the maximum negative pressure absolute value that can be tolerated of the switch tube;

[0057] S15: inputting the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage into the first turn-off negative pressure model to obtain the upper limit absolute value of the turn-off negative pressure of the switch tube, and inputting the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum negative pressure absolute value that can be tolerated into the second turn-off negative pressure model to obtain the lower limit absolute value of the turn-off negative pressure of the switch tube;

[0058] S17: determining the turn-off negative pressure interval of the switch tube according to the upper limit absolute value of the turn-off negative pressure and the lower limit absolute value of the turn-off negative pressure.

[0059] The method for determining the turn-off negative voltage of the switch tube according to the embodiment of the present application inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model to obtain the upper limit absolute value of the turn-off negative voltage of the switch tube, and inputs the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model to obtain the lower limit absolute value of the turn-off negative voltage of the switch tube, and then accurately determines the turn-off negative voltage range of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage range is used to control the negative voltage turn-off of the switch tube, the switch tube can be effectively prevented from being mistakenly turned on, and the switch tube can be protected to prolong the service life of the switch tube.

[0060] It can be understood that although the method of applying a turn-off negative voltage to the gate can be used to prevent the switch tube from being mistakenly turned on, if the upper limit absolute value of the turn-off negative voltage is set too small, the switch tube may still be mistakenly turned on in some cases, and if the lower limit absolute value of the turn-off negative voltage is set too large, the negative voltage peak may exceed the lower limit absolute value of the allowable driving negative voltage of the switch tube, which reduces the service life of the switch tube and even causes the switch to be damaged, so it is necessary to accurately determine the turn-off negative voltage range of the switch tube.

[0061] Specifically, the first turn-off negative voltage model can be used to determine the upper limit absolute value of the turn-off negative voltage of the switch tube, and the expression form of the first turn-off negative voltage model includes but is not limited to a neural network model, a data mapping chart / table, a mathematical relationship, etc. When the first turn-off negative voltage model is a neural network model, the input of the neural network model can include the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage of the switch tube, and the output of the neural network model can include the upper limit absolute value of the turn-off negative voltage of the switch tube, so that after obtaining the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage of the switch tube, the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage are input into the neural network model, and the corresponding more accurate upper limit absolute value of the turn-off negative voltage of the switch tube can be quickly obtained; when the first turn-off negative voltage model is a data mapping chart / table, the data mapping chart / table can include the upper limit absolute value of the turn-off negative voltage of the switch tube corresponding to the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage of different switch tubes, so that after obtaining the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage of the switch tube, the corresponding more accurate upper limit absolute value of the turn-off negative voltage of the switch tube can be quickly obtained by looking up the data mapping chart / table; when the first turn-off negative voltage model is a mathematical relationship, the mathematical relationship can reflect the relationship between the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage of the switch tube and the upper limit absolute value of the turn-off negative voltage of the switch tube, so that after obtaining the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage of the switch tube, the corresponding upper limit absolute value of the turn-off negative voltage of the switch tube can be calculated according to the mathematical relationship.

[0062] The second turn-off negative voltage model can be used to determine the lower limit of the turn-off negative voltage of the switch tube. The expression form of the second turn-off negative voltage model includes but is not limited to a neural network model, a data mapping table, a mathematical relationship, etc. When the second turn-off negative voltage model is a neural network model, the input of the neural network model can include the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum bearable negative voltage of the switch tube, and the output of the neural network model can include the lower limit of the turn-off negative voltage of the switch tube. Therefore, after obtaining the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum bearable negative voltage of the switch tube, the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum bearable negative voltage can be input into the neural network model, and the corresponding more accurate lower limit of the turn-off negative voltage of the switch tube can be quickly obtained. When the second turn-off negative voltage model is a data mapping table, the data mapping table can include the lower limit of the turn-off negative voltage of the switch tube corresponding to the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum bearable negative voltage of different switch tubes, and therefore, after obtaining the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum bearable negative voltage of the switch tube, the corresponding more accurate lower limit of the turn-off negative voltage of the switch tube can be quickly obtained by searching the data mapping table. When the second turn-off negative voltage model is a mathematical relationship, the mathematical relationship can reflect the relationship between the turn-off gate resistance, the turn-on gate resistance, the bus voltage, the maximum bearable negative voltage and the lower limit of the turn-off negative voltage of the switch tube, and therefore, after obtaining the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum bearable negative voltage of the switch tube, the corresponding lower limit of the turn-off negative voltage of the switch tube can be calculated according to the mathematical relationship.

[0063] In some embodiments, the first turn-off negative voltage model and the second turn-off negative voltage model corresponding to the switch tube can be determined according to the model of the switch tube. The expression form of the first turn-off negative voltage model of the switch tube of different models can be the same or different, and the expression form of the second turn-off negative voltage model of the switch tube of different models can be the same or different, which is not limited herein. In some embodiments, the expression form of the first turn-off negative voltage model and the second turn-off negative voltage model of the switch tube of the same model is the same.

[0064] It should be noted that the turn-off negative voltage is a negative number, and the turn-off negative voltage interval can be understood as the value interval of the turn-off negative voltage, that is, the numbers in the turn-off negative voltage interval are all negative numbers.

[0065] In some embodiments of the present application, the first turn-off negative voltage model is expressed according to the following relationship: SS_min V G_on =λ1*f1(R G_off , R DC , V th )–V SS_minThe absolute value of the upper limit of the negative pressure to be turned off, λ1 is the first derating parameter, and f1(R) is the absolute value of the upper limit of the negative pressure to be turned off. G_on R G_off V DC R is the function expression corresponding to the first shut-off negative pressure model. G_on To turn on the gate resistor, R G_off To turn off the gate resistor, V DC V is the bus voltage. th This is the minimum turn-on voltage.

[0066] Thus, the above formula (1) can clearly reflect the relationship between the turn-off gate resistance, turn-on gate resistance, bus voltage, minimum turn-on voltage and the absolute value of the upper limit of the turn-off negative voltage of the switching transistor.

[0067] Specifically, the turn-off gate resistance can be understood as the total resistance value in the turn-off circuit when the switch is turned off, and the turn-on gate resistance can be understood as the total resistance value in the turn-on circuit when the switch is turned on. In some embodiments, the minimum turn-on voltage can be obtained by consulting corresponding data based on the specific model of the switch. In some embodiments, the first derating parameter can be obtained by consulting corresponding derating criteria based on the specific model of the resistor. In some embodiments, the bus voltage can be obtained through a bus voltage measuring device.

[0068] In some embodiments, the relationship between the absolute value of the turn-off negative voltage limit and the turn-on gate resistance, turn-off gate resistance, and bus voltage is as follows: Figure 2 As shown. It can be understood that when the input turn-on gate resistance, turn-off gate resistance, and bus voltage of the first turn-off negative voltage model change, the absolute value of the upper limit of the turn-off negative voltage output of the first turn-off negative voltage model will also change accordingly. Furthermore, by substituting different turn-on gate resistances, different turn-off gate resistances, different bus voltages, and the corresponding absolute values ​​of the upper limit of the turn-off negative voltage obtained through a large number of simulation experiments into the above formula (1), several different polynomials can be obtained. After polynomial fitting, the specific expression of the first turn-off negative voltage model can be obtained: V SS_min =b2*R G_on +b3*R G_off +b4*V DC +b5*R G_on 2 +b6*R G_off 2 +b7*V DC 2 +b8*R G_on *R G_off +b9*R G_off * V DC +b 10 *R G_off *V DC –V thFormula (2), where parameters b2=-24.41, b3=63.47, b4=222.4, b5=0.555, b6=1.033, b7=-8.683, b8=-1.096, b9=6.276, b 10 =-2.759.

[0069] In one example, the minimum turn-on voltage of the switch tube is 1.5V, the bus voltage is 900V, the selected turn-on gate resistance is 40Ω, the selected turn-off gate resistance is 20Ω, and the upper limit absolute value of the turn-off negative voltage can be obtained by using Formula (2) as 2.44V, i.e., the turn-off negative voltage of the switch tube should be less than -2.44V.

[0070] In some embodiments of the present application, the second turn-off negative voltage model is expressed according to the following relationship: V SS_max =V GS_max -λ2*f2(R G_on , R G_off , V DC ) Formula (3), where V SS_max is the lower limit absolute value of the turn-off negative voltage, λ2 is the second derating parameter, f2(R G_on , R G_off , V DC ) is the function expression corresponding to the second turn-off negative voltage model, R G_on is the turn-on gate resistance, R G_off is the turn-off gate resistance, V DC is the bus voltage, and V GS_max is the maximum absolute value of the withstand negative voltage.

[0071] In this way, the relationship between the turn-off gate resistance, the turn-on gate resistance, the bus voltage, and the maximum absolute value of the withstand negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube can be clearly reflected by Formula (3) above.

[0072] Specifically, the turn-off gate resistance can be understood as the total resistance value on the turn-off loop when the switch tube is turned off, and the turn-on gate resistance can be understood as the total resistance value on the turn-on loop when the switch tube is turned on. In some embodiments, the maximum absolute value of the withstand negative voltage can be obtained according to the corresponding data of the specific model of the switch tube. In some embodiments, the second derating parameter can be obtained according to the corresponding derating criterion of the specific model of the resistance. In some embodiments, the bus voltage can be obtained by the voltage measuring device of the bus.

[0073] In some embodiments, the relationship between the lower limit absolute value of the turn-off negative voltage and the turn-on gate resistance, the turn-off gate resistance, and the bus voltage is as shown in Figure 3The input of the second turn-off negative voltage model changes, the absolute value of the lower limit of the turn-off negative voltage output by the second turn-off negative voltage model also changes. Further, different turn-on gate resistances, different turn-off gate resistances, different bus voltages and corresponding absolute values of the lower limit of the turn-off negative voltage are substituted into the above formula (3) to obtain a plurality of different polynomials, and through polynomial fitting, the specific expression of the second turn-off negative voltage model can be obtained: V SS_max = V GS_max +d2*R G_on +d3*R G_off +d4*V DC +d5*R G_on 2 +d6*R G_off 2 +d7*V DC 2 +d8*R G_on *R G_off +d9*R G_off *V DC +d 10 *R G_off *V DC Formula (4), wherein the parameters d2=-122.9, d3=1454.0, d4=-488.3, d5=2.069, d6=-47.87, d7=15.43, d8=-0.805, d9=3.800, d 10 =-5.223.

[0074] In one example, the maximum negative voltage that the switch tube can withstand is-9V, that is, the maximum negative voltage that the switch tube can withstand is 9V in absolute value, the bus voltage is 900V, the selected turn-on gate resistance is 40Ω, and the selected turn-off gate resistance is 20Ω. Using formula (4), the absolute value of the lower limit of the turn-off negative voltage is 4.96V, that is, the turn-off negative voltage of the switch tube should be greater than-4.96V.

[0075] Please combine Figure 4 In some embodiments of the present application, step S17 further comprises the following steps

[0076] S171: taking the negative value of the absolute value of the upper limit of the turn-off negative voltage as the upper limit of the turn-off negative voltage, and taking the negative value of the absolute value of the lower limit of the turn-off negative voltage as the lower limit of the turn-off negative voltage;

[0077] S173: determining the turn-off negative voltage interval according to the lower limit of the turn-off negative voltage and the upper limit of the turn-off negative voltage.

[0078] Therefore, the off negative voltage interval of the switch tube can be accurately obtained, and the switch tube can be turned off when the gate voltage of the switch tube is in the off negative voltage interval, thereby effectively preventing the switch tube from being mistakenly turned on.

[0079] Specifically, the off negative voltage upper limit absolute value can be understood as the absolute value of the upper limit of the off negative voltage, and the off negative voltage lower limit absolute value can be understood as the absolute value of the lower limit of the off negative voltage, that is, the off negative voltage upper limit absolute value and the off negative voltage lower limit absolute value are both positive values, and the off negative voltage of the switch tube is negative, so the negative value of the off negative voltage upper limit absolute value is taken as the off negative voltage upper limit voltage, and the negative value of the off negative voltage lower limit absolute value is taken as the off negative voltage lower limit voltage, so as to determine the off negative voltage interval according to the off negative voltage lower limit voltage and the off negative voltage upper limit voltage, and ensure that the selected off negative voltage of the switch tube is greater than or equal to the off negative voltage lower limit voltage, and the off negative voltage of the switch tube is less than or equal to the off negative voltage upper limit voltage.

[0080] In one example, the minimum turn-on voltage of the switch tube can be 1.5V, the maximum negative voltage that the switch tube can withstand is -9V, that is, the maximum negative voltage absolute value that the switch tube can withstand is 9V, the bus voltage can be 900V, the selected turn-on gate resistor is 40Ω, the selected off gate resistor is 20Ω, the off negative voltage upper limit absolute value can be obtained by using formula (2) as 2.44V, that is, the off negative voltage upper limit voltage of the switch tube is -2.44V, the off negative voltage lower limit absolute value of the switch tube can be obtained by using formula (4) as 4.96V, that is, the off negative voltage lower limit voltage of the switch tube is -4.96V, so the off negative voltage interval of the switch tube can be determined as [-4.96V, -2.44V].

[0081] In some embodiments of the present application, the switch tube is a silicon carbide MOS tube.

[0082] Therefore, the off negative voltage interval can be accurately determined according to the above method, thereby effectively preventing the silicon carbide MOS tube from being mistakenly turned on, and protecting the silicon carbide MOS tube and prolonging the service life of the silicon carbide MOS tube. It can be understood that the silicon carbide MOS tube is more prone to be mistakenly turned on due to its fast switching speed and low minimum turn-on voltage.

[0083] It should be noted that the specific numerical values mentioned above are only used as examples to illustrate the embodiments of the present application, and should not be understood as a limitation of the present application. In other examples or embodiments or examples, other numerical values can be selected according to the present application, which are not specifically limited herein.

[0084] In order to realize the above-mentioned embodiments, the embodiments of the present application also propose a switch tube off negative voltage determination device, which can realize the switch tube off negative voltage determination method of any one of the above-mentioned embodiments. Figure 5is a structural block diagram of a switch tube off negative voltage determination device according to an embodiment of the present application. As shown in Figure 5 The switch tube off negative voltage determination device 10 according to the present application includes a first determination module 12, an acquisition module 14 and a second determination module 16. The first determination module 12 is configured to determine a first off negative voltage model and a second off negative voltage model. The acquisition module 14 is configured to acquire an off gate resistance and an on gate resistance of a switch tube, acquire a bus voltage, and acquire a minimum on voltage and a maximum bearable negative voltage absolute value of the switch tube. The second determination module 16 is configured to input the off gate resistance, the on gate resistance, the bus voltage and the minimum on voltage into the first off negative voltage model to obtain an upper limit absolute value of an off negative voltage of the switch tube, and input the off gate resistance, the on gate resistance, the bus voltage and the maximum bearable negative voltage absolute value into the second off negative voltage model to obtain a lower limit absolute value of the off negative voltage of the switch tube, and determine an off negative voltage interval of the switch tube according to the upper limit absolute value of the off negative voltage and the lower limit absolute value of the off negative voltage.

[0085] The switch tube off negative voltage determination device 10 according to the present application, by inputting the acquired off gate resistance, on gate resistance, bus voltage and minimum on voltage of the switch tube into the first off negative voltage model to obtain the upper limit absolute value of the off negative voltage of the switch tube, and inputting the acquired off gate resistance, on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second off negative voltage model to obtain the lower limit absolute value of the off negative voltage of the switch tube, and then accurately determining the off negative voltage interval of the switch tube according to the upper limit absolute value of the off negative voltage of the switch tube and the lower limit absolute value of the off negative voltage of the switch tube, can effectively prevent the switch tube from being mistakenly turned on when the off negative voltage interval is used to control the negative voltage off of the switch tube, and can protect the switch tube and prolong the service life of the switch tube.

[0086] In some embodiments of the present application, the first off negative voltage model is expressed according to the following relationship: SS_min = λ1*f1(R G_on , R G_off , V DC ) – V th Formula (1), wherein V SS_min is the upper limit absolute value of the off negative voltage, λ1 is a first derating parameter, f1(R G_on , R G_off , V DC ) is a function expression corresponding to the first off negative voltage model, R G_on is the on gate resistance, R G_off is the off gate resistance, V DC is the bus voltage, and V th is the minimum on voltage.

[0087] In some embodiments of the present application, the second turn-off negative voltage model is expressed according to the following relationship: V SS_max = V GS_max - λ2*f2(R G_on , R G_off , V DC ) Formula (3), wherein V SS_max is the absolute value of the lower limit of the turn-off negative voltage, λ2 is the second derating parameter, f2(R G_on , R G_off , V DC ) is the function expression corresponding to the second turn-off negative voltage model, R G_on is the on gate resistance, R G_off is the off gate resistance, V DC is the bus voltage, and V GS_max is the absolute value of the maximum withstand negative voltage.

[0088] In some embodiments of the present application, the second determining module 16 comprises a first determining unit and a second determining unit, the first determining unit is configured to take the negative value of the absolute value of the upper limit of the turn-off negative voltage as the upper limit of the turn-off negative voltage, and take the negative value of the absolute value of the lower limit of the turn-off negative voltage as the lower limit of the turn-off negative voltage, and the second determining unit is configured to determine the turn-off negative voltage interval according to the lower limit of the turn-off negative voltage and the upper limit of the turn-off negative voltage.

[0089] In some embodiments of the present application, the switch tube is a silicon carbide MOS tube.

[0090] It should be noted that the above explanations and descriptions of the embodiments of the method for determining the turn-off negative voltage of the switch tube and the beneficial effects are also applicable to the device 10 for determining the turn-off negative voltage of the switch tube of the present application, and thus will not be described in detail herein.

[0091] In order to implement the above embodiments, the present application further provides an inverter which can implement the method for determining the turn-off negative voltage of the switch tube of any of the above embodiments. Figure 6 is a structural block diagram of an inverter according to an embodiment of the present application. As shown in Figure 6 , the inverter 30 comprises a memory 32, a processor 34, and a program for determining the turn-off negative voltage of the switch tube 36 stored in the memory 32 and executable on the processor 34, and the program for determining the turn-off negative voltage of the switch tube 36 is executed by the processor 34 to implement the method for determining the turn-off negative voltage of the switch tube of any of the above embodiments.

[0092] According to the inverter 30 of the embodiment of the present application, the upper limit absolute value of the turn-off negative voltage of the switch tube is obtained by inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model, and the lower limit absolute value of the turn-off negative voltage of the switch tube is obtained by inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model, and then the turn-off negative voltage interval of the switch tube is accurately determined according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage interval is used for negative voltage turn-off control of the switch tube, the switch tube can be effectively prevented from being turned on by mistake, and the switch tube can be protected, and the service life of the switch tube is prolonged.

[0093] For example, when the turn-off negative voltage determination program 36 of the switch tube is executed by the processor 34, the following steps of the turn-off negative voltage determination method of the switch tube are implemented:

[0094] S11: determine the first turn-off negative voltage model and the second turn-off negative voltage model;

[0095] S13: obtain the turn-off gate resistance and the turn-on gate resistance of the switch tube, obtain the bus voltage, and obtain the minimum turn-on voltage and the maximum bearable negative voltage absolute value of the switch tube;

[0096] S15: input the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the minimum turn-on voltage into the first turn-off negative voltage model to obtain the upper limit absolute value of the turn-off negative voltage of the switch tube, and input the turn-off gate resistance, the turn-on gate resistance, the bus voltage and the maximum bearable negative voltage absolute value into the second turn-off negative voltage model to obtain the lower limit absolute value of the turn-off negative voltage of the switch tube;

[0097] S17: determine the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage and the lower limit absolute value of the turn-off negative voltage.

[0098] It should be pointed out that the above explanations and descriptions of the embodiments and beneficial effects of the turn-off negative voltage determination method of the switch tube are also applicable to the inverter 30 of the present application, and to avoid redundancy, they will not be described in detail here.

[0099] In order to realize the above-mentioned embodiments, the embodiment of the present application further proposes a computer readable storage medium having a turn-off negative voltage determination program of a switch tube stored thereon, and the turn-off negative voltage determination program of the switch tube is executed by a processor to implement the turn-off negative voltage determination method of the switch tube of any one of the above-mentioned embodiments.

[0100] The computer readable storage medium according to the embodiment of the present application, by inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model, obtaining the upper limit absolute value of the turn-off negative voltage of the switch tube, and inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model, obtaining the lower limit absolute value of the turn-off negative voltage of the switch tube, and then accurately determining the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that when the turn-off negative voltage interval is used to control the negative voltage turn-off of the switch tube, the mis-turn-on of the switch tube can be effectively prevented, and the switch tube can be protected, and the service life of the switch tube is prolonged.

[0101] In order to realize the above-mentioned embodiments, the embodiment of the present application further provides a switch tube driving control circuit, Figure 7 is a circuit schematic diagram of the switch tube driving control circuit according to an embodiment of the present application. As shown in the figure, Figure 7 the switch tube driving control circuit 50 of the embodiment of the present application includes a driving power supply 52, a driving unit 54 and a control unit 56. The control unit 56 determines the turn-off negative voltage interval of the switch tube 70 by executing the turn-off negative voltage determination method of any one of the above-mentioned embodiments, and controls the driving power supply 52 to provide a negative turn-off voltage to the driving unit 54 according to the turn-off negative voltage interval; the driving unit 54 is used to drive the switch tube 70 to turn off according to the negative turn-off voltage when receiving a turn-off control signal.

[0102] The switch tube driving control circuit 50 according to the embodiment of the present application, by inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube 70 into the first turn-off negative voltage model, obtaining the upper limit absolute value of the turn-off negative voltage of the switch tube 70, and inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube 70 into the second turn-off negative voltage model, obtaining the lower limit absolute value of the turn-off negative voltage of the switch tube 70, and then accurately determining the turn-off negative voltage interval of the switch tube 70 according to the upper limit absolute value of the turn-off negative voltage of the switch tube 70 and the lower limit absolute value of the turn-off negative voltage of the switch tube 70, so that when the turn-off negative voltage interval is used to control the negative voltage turn-off of the switch tube 70, the mis-turn-on of the switch tube 70 can be effectively prevented, and the switch tube 70 can be protected, and the service life of the switch tube 70 is prolonged.

[0103] In some embodiments, the control unit 56 can be an MCU (Micro Control Unit).

[0104] In some embodiments of the present application, the driving unit 54 comprises a first coupling capacitor and a second coupling capacitor. One end of the first coupling capacitor is connected to the positive turn-on voltage providing end of the driving power supply. One end of the second coupling capacitor is connected to the other end of the first coupling capacitor, and the other end of the second coupling capacitor is connected to the negative turn-off voltage providing end of the driving power supply.

[0105] In this way, the positive turn-on voltage providing end and the negative turn-off voltage providing end of the driving power supply are isolated by the first coupling capacitor and the second coupling capacitor.

[0106] In one example, please refer to Figure 8 , the first coupling capacitor comprises a capacitor C 1P and a capacitor C 2P , the second coupling capacitor comprises a capacitor C 1N and a capacitor C 2N , the driving power supply 52 comprises a first driving power supply 522 and a second driving power supply 524, one end of the capacitor C 1P is connected to the positive turn-on voltage providing end VDD1 of the first driving power supply 522, the other end of the capacitor C 1P is connected to the other end of the capacitor C 1N and has a first node P1, the other end of the capacitor C 1N is connected to the negative turn-off voltage providing end VSS1 of the first driving power supply 522; one end of the capacitor C 2P is connected to the positive turn-on voltage providing end VDD2 of the second driving power supply 524, the other end of the capacitor C 2P is connected to the other end of the capacitor C 2N and has a second node P2, the other end of the capacitor C 2N is connected to the negative turn-off voltage providing end VSS2 of the second driving power supply 524.

[0107] In some embodiments of the present application, when the switch tube 70 is an upper bridge switch tube, the node between the first coupling capacitor and the second coupling capacitor is connected to the midpoint of the bridge arm where the upper bridge switch tube is located; when the switch tube 70 is a lower bridge switch tube, the node between the first coupling capacitor and the second coupling capacitor is grounded.

[0108] In this way, in the bridge inverter circuit, the use of the switch tube driving control circuit 50 can achieve accurate turn-off of the switch tube, thereby effectively preventing the switch tube 70 from being mistakenly turned on, and protecting the switch tube 70 and prolonging the service life. It can be understood that the bridge inverter circuit can comprise a single-phase full-bridge inverter circuit, a three-phase bridge inverter circuit, or a bridge inverter circuit of other topologies.

[0109] In one example, please refer to Figure 8, the switch tube 70 includes an upper bridge switch tube Q1 and a lower bridge switch tube Q2, the source of the upper bridge switch tube Q1 is connected with the drain of the lower bridge switch tube Q2 and has a third node P3, when the switch tube 70 is the upper bridge switch tube Q1, the first coupling capacitor C 1P and the second coupling capacitor C 1N between the first node P1 is connected to the midpoint of the bridge arm (i.e. the third node P3) where the upper bridge switch tube Q1 is located; when the switch tube 70 is the lower bridge switch tube Q2, the second node P2 between the first coupling capacitor C 2P and the second coupling capacitor C 2N is grounded.

[0110] In some embodiments of the present application, the driving unit 54 includes a driving chip and a first gate resistor. The positive power pin of the driving chip is connected to the positive on-voltage providing end of the driving power supply, the negative power pin of the driving chip is connected to the negative off-voltage providing end of the driving power supply, the input pin of the driving chip is connected with the control unit to receive the off control signal sent by the control unit; the first gate resistor, one end of the first gate resistor is connected with the output pin of the driving chip, and the other end of the first gate resistor is connected with the gate of the switch tube.

[0111] In this way, the driving chip can drive the switch tube to turn on or off through the first gate resistor.

[0112] In one example, please combine Figure 8 , the driving chip includes a chip U1 and a chip U2, the first gate resistor includes a resistor R on 1 and a resistor R on 2, the driving power supply 52 includes a first driving power supply 522 and a second driving power supply 524, the switch tube 70 includes an upper bridge switch tube Q1 and a lower bridge switch tube Q2, the first coupling capacitor includes a capacitor C 1P and a capacitor C 2P , the second coupling capacitor includes a capacitor C 1N and a capacitor C 2N .

[0113] The positive power pin VDD of the driving chip U1 is connected to the positive on-voltage providing end VDD1 of the first driving power supply 522, the negative power pin VSS of the driving chip U1 is connected to the negative off-voltage providing end VSS1 of the first driving power supply 522, the input pin IN of the driving chip U1 is connected with the first end of the control unit 56 to receive the off control signal sent by the control unit 56, and the output pin OUT of the driving chip U1 is connected with one end of the resistor R on 1. The other end of the resistor R on 1 is connected with the gate of the upper bridge switch tube Q1, the source of the upper bridge switch tube Q1 is connected with the drain of the lower bridge switch tube Q2, and has a third node P3. The capacitor C 1Pone end of the capacitor C 1P is connected to the positive turn-on voltage providing end VDD1 of the first driving power supply 522, and the other end of the capacitor C 1N is connected to the first node P1 of the capacitor C 1N and has the third node P3, and the other end of the capacitor C on is connected to the negative turn-off voltage providing end VSS1 of the first driving power supply 522.

[0114] The positive power supply pin VDD of the driving chip U2 is connected to the positive turn-on voltage providing end VDD2 of the second driving power supply 524, the negative power supply pin VSS of the driving chip U2 is connected to the negative turn-off voltage providing end VSS2 of the second driving power supply 524, the input pin IN of the driving chip U2 is connected to the second end of the control unit 56 to receive the turn-off control signal sent by the control unit 56, and one end of the resistor R on 2 is connected to the output pin OUT of the driving chip U2. The other end of the resistor R on 2 is connected to the gate of the lower bridge switch Q2. The drain of the lower bridge switch Q2 is connected to the source of the upper bridge switch Q1, and the source of the lower bridge switch Q2 is grounded. One end of the capacitor C 2P is connected to the positive turn-on voltage providing end VDD2 of the second driving power supply 524, and the other end of the capacitor C 2P is connected to the first node P1 of the capacitor C 2N and has the second node P2, and the second node P2 is grounded, and the other end of the capacitor C 2N is connected to the negative turn-off voltage providing end VSS2 of the second driving power supply 524.

[0115] When the control unit 56 sends a turn-on control signal through the first end, the positive power supply pin VDD of the driving chip U1 is in communication with the output pin OUT, the first driving power supply 522 provides a positive voltage to the positive power supply pin VDD of the driving chip U1, the OUT pin of the driving chip U1 outputs a positive voltage, and after being divided by the resistor R on 1, a positive turn-on voltage is provided to the gate of the upper bridge switch Q1, and the upper bridge switch Q1 is turned on. It can be understood that the turn-on gate resistance at this time is the resistor R on 1; when the control unit 56 sends a turn-off control signal through the first end, the negative power supply pin VSS of the driving chip U1 is in communication with the output pin OUT, the first driving power supply 522 provides a negative voltage to the negative power supply pin VSS of the driving chip U1, the OUT pin of the driving chip U1 outputs a negative voltage, and after being divided by the resistor R on 1, a negative turn-off voltage is provided to the gate of the upper bridge switch Q1, and the upper bridge switch Q1 is turned off. It can be understood that the turn-off gate resistance at this time is the resistor R on 1 resistance value.

[0116] When the control unit 56 sends the turn-on control signal through the second end, the positive power supply pin VDD of the drive chip U2 is connected to the output pin OUT, the second drive power supply 524 provides a positive voltage to the positive power supply pin VDD of the drive chip U2, the OUT pin of the drive chip U2 outputs a positive voltage, and the positive voltage is divided by the resistors R on 2 and then provided to the gate of the lower bridge switch Q2, and the lower bridge switch Q2 is turned on. It can be understood that the turn-on gate resistor at this time is the resistor R on 2. When the control unit 56 sends the turn-off control signal through the second end, the negative power supply pin VSS of the drive chip U2 is connected to the output pin OUT, the second drive power supply 524 provides a negative voltage to the drive chip U2, the OUT pin of the drive chip U2 outputs a negative voltage, and the negative voltage is divided by the resistors R on 2 and then provided to the gate of the lower bridge switch Q2, and the lower bridge switch Q2 is turned off. It can be understood that the turn-off gate resistor at this time is the resistor R on 2. The resistor value.

[0117] In some embodiments of the present application, the drive unit 54 further includes a first diode and a second gate resistor. The cathode of the first diode is connected to one end of the first gate resistor. One end of the second gate resistor is connected to the anode of the first diode, and the other end of the second gate resistor is connected to the other end of the first gate resistor.

[0118] In one example, please refer to Figure 9 , the drive chip includes chip U1 and chip U2, the first gate resistor includes resistor R on 1 and resistor R on 2, the second gate resistor includes resistor R off 1 and resistor R off 2, the drive power supply 52 includes a first drive power supply 522 and a second drive power supply 524, the switch 70 includes an upper bridge switch Q1 and a lower bridge switch Q2, the first coupling capacitor includes capacitor C 1P and capacitor C 2P , the second coupling capacitor includes capacitor C 1N and capacitor C 2N , and the first diode includes diode D1 and diode D2.

[0119] The positive power supply pin VDD of the drive chip U1 is connected to the positive turn-on voltage providing end VDD1 of the first drive power supply 522, the negative power supply pin VSS of the drive chip U1 is connected to the negative turn-off voltage providing end VSS1 of the first drive power supply 522, the input pin IN of the drive chip U1 is connected to the first end of the control unit 56 to receive the turn-off control signal sent by the control unit 56, and the output pin OUT of the drive chip U1 is connected to one end of the resistor R on 1. The resistor Ron The other end of diode D1 is connected to the gate of the upper bridge switch Q1. The source of the upper bridge switch Q1 is connected to the drain of the lower bridge switch Q2, and it has a third node P3. The cathode of diode D1 is connected to resistor R. on One end of diode D1 is connected to resistor R. off One end of 1 is connected, and the resistor R off The other end of 1 is connected to resistor R. on The other end of 1 is connected. Capacitor C 1P One end is connected to the positive turn-on voltage supply terminal VDD1 of the first drive power supply 522, and capacitor C 1P The other end is connected to capacitor C 1N One end is connected and has a first node P1, the first node P1 is connected to the third node P3, and the capacitor C 1N The other end is connected to the negative turn-off voltage supply terminal VSS1 of the first drive power supply 522.

[0120] The positive power supply pin VDD of driver chip U2 is connected to the positive turn-on voltage supply terminal VDD2 of the second drive power supply 524, and the negative power supply pin VSS of driver chip U2 is connected to the negative turn-off voltage supply terminal VSS2 of the second drive power supply 524. The input pin IN of driver chip U2 is connected to the second terminal of control unit 56 to receive the turn-off control signal issued by control unit 56. The output pin OUT of driver chip U2 is connected to resistor R. on One end of 2 is connected. Resistor R on The other end of diode D2 is connected to the gate of the lower bridge switch Q2. The drain of the lower bridge switch Q2 is connected to the source of the upper bridge switch Q1, and the source of the lower bridge switch Q2 is grounded. The cathode of diode D2 is connected to resistor R. on 2. One end of diode D2 is connected to resistor R. off One end of 2 is connected, and the resistor R off The other end of 2 is connected to resistor R. on The other end of 2 is connected. Capacitor C 2P One end is connected to the positive turn-on voltage supply terminal VDD2 of the second drive power supply 524, and capacitor C 2P The other end is connected to capacitor C 2N One end is connected and has a second node P2, the second node P2 is grounded, and capacitor C 2N The other end is connected to the negative turn-off voltage supply terminal VSS2 of the second drive power supply 524.

[0121] When the control unit 56 sends an opening control signal through the first end, the positive power pin VDD of the driving chip U1 is connected with the output pin OUT, the first driving power supply 522 provides a positive voltage to the positive power pin VDD of the driving chip U1, the OUT pin of the driving chip U1 outputs the positive voltage, the diode D1 is cut off, and the voltage after the voltage division of the resistors R on 1 is provided to the gate of the upper bridge switch Q1, and the upper bridge switch Q1 is opened. It can be understood that the opening gate resistance at this time can be the resistor R on 1; when the control unit 56 sends a closing control signal through the first end, the negative power pin VSS of the driving chip U1 is connected with the output pin OUT, the first driving power supply 522 provides a negative voltage to the negative power pin VSS of the driving chip U1, the OUT pin of the driving chip U1 outputs the negative voltage, the diode D1 is turned on, and the voltage after the voltage division of the resistors R on 1 and the resistor R off 1 in parallel is provided to the gate of the upper bridge switch Q1, and the upper bridge switch Q1 is closed. It can be understood that the closing gate resistance at this time can be the resistor R on 1 and the resistor R off 1 in parallel.

[0122] When the control unit 56 sends an opening control signal through the second end, the positive power pin VDD of the driving chip U2 is connected with the output pin OUT, the second driving power supply 524 provides a positive voltage to the positive power pin VDD of the driving chip U2, the OUT pin of the driving chip U2 outputs the positive voltage, the diode D2 is cut off, and the voltage after the voltage division of the resistors R on 2 is provided to the gate of the lower bridge switch Q2, and the lower bridge switch Q2 is opened. It can be understood that the opening gate resistance at this time can be the resistor R on 2; when the control unit 56 sends a closing control signal through the second end, the negative power pin VSS of the driving chip U2 is connected with the output pin OUT, the second driving power supply 524 provides a negative voltage to the driving chip U2, the OUT pin of the driving chip U2 outputs the negative voltage, the diode D2 is turned on, and the voltage after the voltage division of the resistors R on 2 and the resistor R off 2 in parallel is provided to the gate of the lower bridge switch Q2, and the lower bridge switch Q2 is closed. It can be understood that the closing gate resistance at this time can be the resistor R on 2 and the resistor R off 2 in parallel.

[0123] It should be noted that there is an opening resistance when the diode is turned on. In some embodiments, the opening gate resistance and the closing gate resistance can also be calculated considering the opening resistance of the diode.

[0124] In some embodiments of the application, the driving unit 54 further comprises a second diode, a cathode of the second diode is connected to one end of the first gate resistor, and an anode of the second diode is connected to the cathode of the first diode.

[0125] In one example, please refer to Figure 10 , the driving chip comprises a chip U1 and a chip U2, the first gate resistor comprises a resistor R on 1 and a resistor R on 2, the second gate resistor comprises a resistor R off 1 and a resistor R off 2, the driving power supply 52 comprises a first driving power supply 522 and a second driving power supply 524, the switch tube 70 comprises an upper bridge switch tube Q1 and a lower bridge switch tube Q2, the first coupling capacitor comprises a capacitor C 1P and a capacitor C 2P , the second coupling capacitor comprises a capacitor C 1N and a capacitor C 2N , the first diode comprises a diode D1 and a diode D3, and the second diode comprises a diode D2 and a diode D4.

[0126] The positive power supply pin VDD of the driving chip U1 is connected to the positive forward-on voltage providing end VDD1 of the first driving power supply 522, the negative power supply pin VSS of the driving chip U1 is connected to the negative backward-off voltage providing end VSS1 of the first driving power supply 522, the input pin IN of the driving chip U1 is connected to the first end of the control unit 56 to receive the off control signal sent by the control unit 56, and the output pin OUT of the driving chip U1 is connected to the anode of the diode D2, and one end of the resistor R on 1 is connected to the cathode of the diode D2. The other end of the resistor R on 1 is connected to the gate of the upper bridge switch tube Q1, the source of the upper bridge switch tube Q1 is connected to the drain of the lower bridge switch tube Q2, and has a third node P3. The cathode of the diode D1 is connected to the anode of the diode D2, one end of the resistor R off 1 is connected to the anode of the diode D1, and the other end of the resistor R off 1 is connected to the other end of the resistor R on 1. One end of the capacitor C 1P is connected to the positive forward-on voltage providing end VDD1 of the first driving power supply 522, the other end of the capacitor C 1P is connected to one end of the capacitor C 1N and has a first node P1, the first node P1 is connected to the third node P3, and the other end of the capacitor C 1N is connected to the negative backward-off voltage providing end VSS1 of the first driving power supply 522.

[0127] The positive power supply pin VDD of the driving chip U2 is connected to the positive turn-on voltage providing end VDD2 of the second driving power supply 524, the negative power supply pin VSS of the driving chip U2 is connected to the negative turn-off voltage providing end VSS2 of the second driving power supply 524, the input pin IN of the driving chip U2 is connected to the second end of the control unit 56 to receive the turn-off control signal sent by the control unit 56, the output pin OUT of the driving chip U2 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to one end of the resistor R on 2, the other end of the resistor R on 2 is connected to the gate of the lower bridge switch Q2. The cathode of the diode D3 is connected to the anode of the diode D4, the anode of the diode D3 is connected to one end of the resistor R off 2, the other end of the resistor R off 2 is connected to the resistor R on 2, the other end of the resistor R 2P 2 is connected. The drain of the lower bridge switch Q2 is connected to the source of the upper bridge switch Q1, and the source of the lower bridge switch Q2 is grounded. One end of the capacitor C 2P is connected to the positive turn-on voltage providing end VDD2 of the second driving power supply 524, and the other end of the capacitor C 2N is connected to the capacitor C 2N , and has a second node P2, and the second node P2 is grounded. The other end of the capacitor C on is connected to the negative turn-off voltage providing end VSS2 of the second driving power supply 524.

[0128] When the control unit 56 sends a turn-on control signal through the first end, the positive power supply pin VDD of the driving chip U1 is in communication with the output pin OUT, the first driving power supply 522 provides a positive voltage to the positive power supply pin VDD of the driving chip U1, the OUT pin of the driving chip U1 outputs a positive voltage, the diode D2 is turned on, the diode D1 is turned off, and after being divided by the resistor R on 1, a positive turn-on voltage is provided to the gate of the upper bridge switch Q1, and the upper bridge switch Q1 is turned on. It can be understood that the turn-on gate resistor at this time can be the resistor R on 1; when the control unit 56 sends a turn-off control signal through the first end, the negative power supply pin VSS of the driving chip U1 is in communication with the output pin OUT, the first driving power supply 522 provides a negative voltage to the negative power supply pin VSS of the driving chip U1, the OUT pin of the driving chip U1 outputs a negative voltage, the diode D1 is turned on, the diode D2 is turned off, and after being divided by the resistor R off 1, a negative turn-off voltage is provided to the gate of the upper bridge switch Q1, and the upper bridge switch Q1 is turned off. It can be understood that the turn-off gate resistor at this time can be the resistor R off 1.

[0129] When the control unit 56 sends the turn-on control signal through the second terminal, the positive power supply pin VDD of the drive chip U2 is connected with the output pin OUT, the second drive power supply 524 provides a positive voltage to the positive power supply pin VDD of the drive chip U2, the OUT pin of the drive chip U2 outputs the positive voltage, the diode D4 is turned on, the diode D3 is turned off, and the voltage is divided by the resistors R on 2, and then a positive turn-on voltage is provided for the gate of the lower bridge switch Q2, and the lower bridge switch Q2 is turned on. It can be understood that the turn-on gate resistor at this time can be the resistor R on 2; when the control unit 56 sends the turn-off control signal through the second terminal, the negative power supply pin VSS of the drive chip U2 is connected with the output pin OUT, the second drive power supply 524 provides a negative voltage to the negative power supply pin VSS of the drive chip U2, the OUT pin of the drive chip U2 outputs the negative voltage, the diode D3 is turned on, the diode D4 is turned off, and the voltage is divided by the resistors R off 2, and then a negative turn-off voltage is provided for the gate of the lower bridge switch Q2, and the lower bridge switch Q2 is turned off. It can be understood that the turn-off gate resistor at this time can be the resistor R off 2.

[0130] It should be noted that there is a turn-on resistor when the diode is turned on. In some embodiments, the turn-on resistor and the turn-off resistor can also be considered when calculating the turn-on gate resistor and the turn-off gate resistor.

[0131] In some embodiments of the present application, the drive unit 54 further comprises a first diode and a second gate resistor. The cathode of the first diode is connected with one end of the first gate resistor, and the anode of the first diode is connected with the other end of the first gate resistor. One end of the second gate resistor is connected with the anode of the first diode, and the other end of the second gate resistor is connected with the gate of the switch.

[0132] In one example, please refer to Figure 11 , the drive chip includes chip U1 and chip U2, the first gate resistor includes resistor R on 1 and resistor R on 2, the second gate resistor includes resistor R off 1 and resistor R off 2, the drive power supply 52 includes a first drive power supply 522 and a second drive power supply 524, the switch 70 includes an upper bridge switch Q1 and a lower bridge switch Q2, the first coupling capacitor includes capacitor C 1P and capacitor C 2P , the second coupling capacitor includes capacitor C 1N and capacitor C 2N , and the first diode includes diode D1 and diode D2.

[0133] The positive power supply pin VDD of the driving chip U1 is connected to the positive turn-on voltage providing end VDD1 of the first driving power supply 522, the negative power supply pin VSS of the driving chip U1 is connected to the negative turn-off voltage providing end VSS1 of the first driving power supply 522, the input pin IN of the driving chip U1 is connected to the first end of the control unit 56 to receive the turn-off control signal sent by the control unit 56, the output pin OUT of the driving chip U1 is connected to one end of the resistor R on 1, the other end of the resistor R on 1 is connected to the gate of the upper bridge switch tube Q1, the source of the upper bridge switch tube Q1 is connected to the drain of the lower bridge switch tube Q2, and the upper bridge switch tube Q1 has a third node P3. The cathode of the diode D1 is connected to one end of the resistor R off 1, the anode of the diode D1 is connected to the resistor R off 1, and the other end of the resistor R on 1 is connected to the gate of the upper bridge switch tube Q1, the source of the upper bridge switch tube Q1 is connected to the drain of the lower bridge switch tube Q2, and the upper bridge switch tube Q1 has a third node P3. The cathode of the diode D1 is connected to one end of the resistor R on 1, and the other end of the resistor R 1P 1 is connected to the gate of the upper bridge switch tube Q1, the source of the upper bridge switch tube Q1 is connected to the drain of the lower bridge switch tube Q2, and the upper bridge switch tube Q1 has a third node P3. The cathode of the diode D1 is connected to one end of the resistor R 1P 1, and the other end of the resistor R 1N 1 is connected to the gate of the upper bridge switch tube Q1, the source of the upper bridge switch tube Q1 is connected to the drain of the lower bridge switch tube Q2, and the upper bridge switch tube Q1 has a third node P3. The cathode of the diode D1 is connected to one end of the resistor R 1N 1, and the other end of the resistor R

[0134] The positive power supply pin VDD of the driving chip U1 is connected to the positive turn-on voltage providing end VDD1 of the first driving power supply 522, the negative power supply pin VSS of the driving chip U1 is connected to the negative turn-off voltage providing end VSS1 of the first driving power supply 522, the input pin IN of the driving chip U1 is connected to the first end of the control unit 56 to receive the turn-off control signal sent by the control unit 56, the output pin OUT of the driving chip U1 is connected to one end of the resistor R on 2, the other end of the resistor R on 2 is connected to the gate of the lower bridge switch tube Q2. The drain of the lower bridge switch tube Q2 is connected to the source of the upper bridge switch tube Q1, and the source of the lower bridge switch tube Q2 is grounded. The cathode of the diode D2 is connected to one end of the resistor R off 2, the anode of the diode D2 is connected to the resistor R off 2, and the other end of the resistor R on 2 is connected to the gate of the lower bridge switch tube Q2. The drain of the lower bridge switch tube Q2 is connected to the source of the upper bridge switch tube Q1, and the source of the lower bridge switch tube Q2 is grounded. The cathode of the diode D2 is connected to one end of the resistor R on 2, and the other end of the resistor R 2P 2 is connected to the gate of the lower bridge switch tube Q2. The drain of the lower bridge switch tube Q2 is connected to the source of the upper bridge switch tube Q1, and the source of the lower bridge switch tube Q2 is grounded. The cathode of the diode D2 is connected to one end of the resistor R 2P 2, and the other end of the resistor R 2N 2 is connected to the gate of the lower bridge switch tube Q2. The drain of the lower bridge switch tube Q2 is connected to the source of the upper bridge switch tube Q1, and the source of the lower bridge switch tube Q2 is grounded. The cathode of the diode D2 is connected to one end of the resistor R2N The other end is connected to the negative off voltage supply end VSS2 of the second driving power supply 524.

[0135] When the control unit 56 sends an on control signal through the first end, the positive power supply pin VDD of the driving chip U1 is in communication with the output pin OUT, the first driving power supply 522 provides a positive voltage to the positive power supply pin VDD of the driving chip U1, the OUT pin of the driving chip U1 outputs a positive voltage, the diode D1 is cut off, and the gate of the upper bridge switch Q1 is provided with a positive on voltage through the series connection of the resistor R on 1 and the resistor R off 1, and the upper bridge switch Q1 is turned on. It can be understood that the on gate resistance at this time is the resistance value of the resistor R on 1 and the resistor R off 1. When the control unit 56 sends an off control signal through the first end, the negative power supply pin VSS of the driving chip U1 is in communication with the output pin OUT, the first driving power supply 522 provides a negative voltage to the negative power supply pin VSS of the driving chip U1, the OUT pin of the driving chip U1 outputs a negative voltage, the diode D1 is turned on, the resistor R on 1 is short-circuited, and the gate of the upper bridge switch Q1 is provided with a negative off voltage through the voltage division of the resistor R off 1, and the upper bridge switch Q1 is turned off. It can be understood that the off gate resistance at this time is the resistance value of the resistor R off 1.

[0136] When the control unit 56 sends an on control signal through the second end, the positive power supply pin VDD of the driving chip U2 is in communication with the output pin OUT, the second driving power supply 524 provides a positive voltage to the positive power supply pin VDD of the driving chip U2, the OUT pin of the driving chip U2 outputs a positive voltage, the diode D2 is cut off, and the gate of the lower bridge switch Q2 is provided with a positive on voltage through the series connection of the resistor R on 1 and the resistor R off 1. The lower bridge switch Q2 is turned on. It can be understood that the on gate resistance at this time is the resistance value of the resistor R on 2 and the resistor R off 2. When the control unit 56 sends an off control signal through the second end, the negative power supply pin VSS of the driving chip U2 is in communication with the output pin OUT, the second driving power supply 524 provides a negative voltage to the negative power supply pin VSS of the driving chip U2, the OUT pin of the driving chip U2 outputs a negative voltage, the diode D2 is turned on, the resistor R on 2 is short-circuited, and the gate of the lower bridge switch Q2 is provided with a negative off voltage through the voltage division of the resistor R off 2. The lower bridge switch Q2 is turned off. It can be understood that the off gate resistance at this time is the resistance value of the resistor R off 2.

[0137] It should be noted that the diode has a turn-on resistance, and in some embodiments, the turn-on resistance of the diode can also be considered when calculating the turn-on gate resistance and the turn-off gate resistance.

[0138] To achieve the above-mentioned embodiments, the embodiments of the present application also provide a motor control system, Figure 12 is a structural block diagram of a motor control system according to an embodiment of the present application, as Figure 12 shown, the motor control system 100 includes the switching tube driving control circuit 50 of any of the above-mentioned embodiments.

[0139] To achieve the above-mentioned embodiments, the embodiments of the present application also provide a compressor, Figure 13 is a structural block diagram of a compressor according to an embodiment of the present application, as Figure 13 shown, the compressor 200 includes the motor control system 100 of the above-mentioned embodiments.

[0140] To achieve the above-mentioned embodiments, the embodiments of the present application also provide a vehicle, Figure 14 is a structural block diagram of a vehicle according to an embodiment of the present application, as Figure 14 shown, the vehicle 300 includes the compressor 200 of the above-mentioned embodiments.

[0141] The vehicle 300 can be a new energy vehicle, and in some embodiments, the new energy vehicle can be a pure electric vehicle using a motor as the main driving force, and in other embodiments, the new energy vehicle can also be a hybrid vehicle using an internal combustion engine and a motor as the main driving force. Regarding the internal combustion engine and the motor mentioned in the above-mentioned embodiments for providing driving force for the new energy vehicle, the internal combustion engine can use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide power for the motor can use power battery, hydrogen fuel cell, etc., which is not specially limited here. It should be noted that here is only an exemplary description of the structure of the new energy vehicle, and is not a limitation on the protection scope of the present application.

[0142] In addition, in some embodiments, the compressor applicable to the above-mentioned new energy vehicle according to the embodiments of the present application can be an electric compressor including a driving part and a compression part, the driving part of the electric compressor drives the compression part to perform compression work, for example, the driving part can be a driving motor including a rotor and a stator. In addition, in some embodiments, the electric compressor can be a low-back-pressure compressor, the driving part can be arranged in a low-pressure cavity in communication with the suction port of the compressor, and the compression part can be arranged in a high-pressure cavity in communication with the exhaust port of the compressor. In addition, in some embodiments, the electric compressor can be a horizontal compressor, the driving part and the compression part can be arranged in a transverse direction, etc.

[0143] The motor control system 100, the compressor 200 and the vehicle 300 according to the embodiments of the present application can obtain the upper limit absolute value of the turn-off negative voltage of the switch tube by inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and minimum turn-on voltage of the switch tube into the first turn-off negative voltage model, and obtain the lower limit absolute value of the turn-off negative voltage of the switch tube by inputting the obtained turn-off gate resistance, turn-on gate resistance, bus voltage and maximum bearable negative voltage absolute value of the switch tube into the second turn-off negative voltage model, and then accurately determine the turn-off negative voltage interval of the switch tube according to the upper limit absolute value of the turn-off negative voltage of the switch tube and the lower limit absolute value of the turn-off negative voltage of the switch tube, so that the switch tube can be effectively prevented from being turned on by mistake when the switch tube is controlled to be turned off by negative voltage according to the turn-off negative voltage interval, and the switch tube can be protected, and the service life of the switch tube can be prolonged.

[0144] It should be noted that the above explanations and descriptions of the embodiments and advantages of the switch tube driving control circuit are also applicable to the motor control system 100, the compressor 200 and the vehicle 300 of the present application, and will not be described in detail herein to avoid redundancy.

[0145] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product. Therefore, the present application can be in the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0146] The present application is described with reference to flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The functions specified in one flow or multiple flows and / or blocks

[0147] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a manufactured product including instruction devices that implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocksFigure 1 the function specified in the one or more blocks.

[0148] These computer program instructions can also be loaded into computer or other programmable data processing devices, so that a series of operation steps are performed on the computer or other programmable data processing devices to generate computer-implemented processes, thus the instructions executed on the computer or other programmable data processing devices provide a process for implementing the flow Figure 1 the flow or flows and / or blocks Figure 1 the steps of the function specified in the one or more blocks.

[0149] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0150] In addition, the terms "first", "second", and the like used in the embodiments of the present application are only for the purpose of description, and can not be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the features defined with "first", "second", and the like in the embodiments of the present application can explicitly or implicitly indicate that the embodiments include at least one of the features. In the description of the present application, the meaning of the word "plurality" is at least two or two or more, such as two, three, four, and the like, unless otherwise specifically limited in the embodiments.

[0151] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0152] It should be noted that the technical features of the above embodiments can be combined in any way, and in order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0153] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A method for determining the turn-off negative voltage of a switching transistor, characterized in that, include: Determine the first and second shut-off negative pressure models; Obtain the turn-off gate resistance and turn-on gate resistance of the switching transistor, obtain the bus voltage, and obtain the minimum turn-on voltage and the absolute value of the maximum negative voltage that the switching transistor can withstand. The turn-off gate resistor, the turn-on gate resistor, the bus voltage, and the minimum turn-on voltage are input into the first turn-off negative voltage model to obtain the absolute value of the upper limit of the turn-off negative voltage of the switch. The turn-off gate resistor, the turn-on gate resistor, the bus voltage, and the absolute value of the maximum withstandable negative voltage are input into the second turn-off negative voltage model to obtain the absolute value of the lower limit of the turn-off negative voltage of the switch. The turn-off negative voltage range of the switching transistor is determined based on the absolute value of the upper limit of the turn-off negative voltage and the absolute value of the lower limit of the turn-off negative voltage.

2. The method according to claim 1, characterized in that, The first shut-off negative pressure model is expressed according to the following relationship: V SS_min =λ1*f1(R G_on ,R G_off ,V DC )–V th Among them, V SS_min λ1 is the absolute value of the upper limit of the shut-off negative pressure, f1(R) is the first derating parameter, and f1(R) is the absolute value of the upper limit of the shut-off negative pressure. G_on R G_off V DC R is the function expression corresponding to the first shut-off negative pressure model. G_on R is the gate resistance for turning on. G_off V is the gate resistance that is turned off. DC V is the bus voltage. th This refers to the minimum turn-on voltage.

3. The method according to claim 1, characterized in that, The second shut-off negative pressure model is expressed according to the following relationship: V SS_max =V GS_max –λ2*f2(R G_on ,R G_off ,V DC ) Among them, V SS_max λ2 is the absolute value of the lower limit of the shut-off negative pressure, f2(R) is the second derating parameter, and f2(R) is the absolute value of the lower limit of the shut-off negative pressure. G_on R G_off V DC R is the function expression corresponding to the second shut-off negative pressure model. G_on R is the gate resistance for turning on. G_off V is the gate resistance that is turned off. DC V is the bus voltage. GS_max This is the absolute value of the maximum negative pressure that can be withstood.

4. The method according to any one of claims 1-3, characterized in that, The turn-off negative voltage range of the switching transistor is determined based on the absolute value of the upper limit of the turn-off negative voltage and the absolute value of the lower limit of the turn-off negative voltage, including: The negative value of the absolute value of the upper limit of the shutdown negative voltage is taken as the upper limit voltage of the shutdown negative voltage, and the negative value of the absolute value of the lower limit of the shutdown negative voltage is taken as the lower limit voltage of the shutdown negative voltage. The shutdown negative voltage range is determined based on the lower limit voltage of the shutdown negative voltage and the upper limit voltage of the shutdown negative voltage.

5. The method according to any one of claims 1-3, characterized in that, The switching transistor is a silicon carbide MOSFET.

6. A device for determining the turn-off negative voltage of a switching transistor, characterized in that, include: The first determining module is used to determine the first shut-off negative pressure model and the second shut-off negative pressure model; The acquisition module is used to acquire the turn-off gate resistance and turn-on gate resistance of the switching transistor, acquire the bus voltage, and acquire the minimum turn-on voltage and the absolute value of the maximum negative voltage that the switching transistor can withstand. The second determining module is used to input the turn-off gate resistance, the turn-on gate resistance, the bus voltage, and the minimum turn-on voltage into the first turn-off negative voltage model to obtain the absolute value of the upper limit of the turn-off negative voltage of the switching transistor, and input the turn-off gate resistance, the turn-on gate resistance, the bus voltage, and the absolute value of the maximum withstand negative voltage into the second turn-off negative voltage model to obtain the absolute value of the lower limit of the turn-off negative voltage of the switching transistor, and determine the turn-off negative voltage range of the switching transistor based on the absolute value of the upper limit of the turn-off negative voltage and the absolute value of the lower limit of the turn-off negative voltage.

7. An inverter, characterized in that, The device includes a memory, a processor, and a switch transistor turn-off negative voltage determination program stored in the memory and executable on the processor. When the processor executes the switch transistor turn-off negative voltage determination program, it implements the switch transistor turn-off negative voltage determination method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, It stores a turn-off negative voltage determination program for a switching transistor, which, when executed by a processor, implements the turn-off negative voltage determination method for a switching transistor according to any one of claims 1-5.

9. A switching transistor drive control circuit, characterized in that, It includes a power supply, a drive unit, and a control unit, among which, The control unit obtains the turn-off negative voltage range of the switching transistor by executing the turn-off negative voltage determination method of any one of claims 1-5, and controls the drive power supply to provide a negative turn-off voltage to the drive unit according to the turn-off negative voltage range; The driving unit is used to drive the switching transistor to turn off according to the negative turn-off voltage when a turn-off control signal is received.

10. The switching transistor drive control circuit according to claim 9, characterized in that, The driving unit includes: The driver chip has its positive power supply pin connected to the positive turn-on voltage supply terminal of the drive power supply, its negative power supply pin connected to the negative turn-off voltage supply terminal of the drive power supply, and its input pin connected to the control unit to receive the turn-off control signal sent by the control unit. A first gate resistor, one end of which is connected to the output pin of the driver chip, and the other end of which is connected to the gate of the switching transistor.

11. The switching transistor drive control circuit according to claim 10, characterized in that, The drive unit further includes: The first diode, wherein the cathode of the first diode is connected to one end of the first gate resistor; A second gate resistor, one end of which is connected to the anode of the first diode, and the other end of which is connected to the other end of the first gate resistor.

12. The switching transistor drive control circuit according to claim 11, characterized in that, The drive unit further includes: The second diode has its cathode connected to one end of the first gate resistor, and its anode connected to the cathode of the first diode.

13. The switching transistor drive control circuit according to claim 10, characterized in that, The drive unit further includes: The first diode has its cathode connected to one end of the first gate resistor and its anode connected to the other end of the first gate resistor. A second gate resistor, one end of which is connected to the anode of the first diode, and the other end of which is connected to the gate of the switching transistor.

14. The switching transistor drive control circuit according to any one of claims 9-13, characterized in that, The drive unit further includes: A first coupling capacitor, one end of which is connected to the positive turn-on voltage supply terminal of the drive power supply; A second coupling capacitor is connected at one end to the other end of the first coupling capacitor, and the other end of the second coupling capacitor is connected to the negative turn-off voltage supply terminal of the drive power supply.

15. The switching transistor drive control circuit according to claim 14, characterized in that, When the switching transistor is an upper bridge switching transistor, the node between the first coupling capacitor and the second coupling capacitor is connected to the midpoint of the bridge arm where the upper bridge switching transistor is located. When the switching transistor is a lower bridge switching transistor, the node between the first coupling capacitor and the second coupling capacitor is grounded.

16. A motor control system, characterized in that, Includes the switching transistor drive control circuit according to any one of claims 9-15.

17. A compressor, characterized in that, Includes the motor control system according to claim 16.

18. A vehicle, characterized in that, Includes the compressor according to claim 17.

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