Crosstalk suppression circuit and device, driving system and vehicle

Abstract

The invention discloses a crosstalk suppression circuit and device, a driving system and a vehicle, and relates to the technical field of power electronics. The crosstalk suppression circuit comprises a first crosstalk suppression sub-circuit, the first end of the first crosstalk suppression sub-circuit is suitable for being connected with the control end of any power device in the half-bridge circuit, the second end of the first crosstalk suppression sub-circuit is suitable for being connected with a first ground signal, and the first crosstalk suppression sub-circuit is used for outputting the first ground signal when crosstalk current flows out of the control end of the power device. And the first end and the second end of the first crosstalk suppression sub-circuit are communicated to discharge the crosstalk current. The circuit can suppress bridge arm crosstalk and does not need additional control signals.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510764782.4, filed on June 9, 2025, entitled "Crosstalk Suppression Circuit, Apparatus and Drive System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of power electronics technology, and in particular to a crosstalk suppression circuit, device, drive system, and vehicle. Background Technology

[0004] Power devices are the foundation of power electronics technology and have opened up broad prospects for the development of new energy vehicles. Third-generation power semiconductor devices, represented by SiC (Silicon Carbide) MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), have advantages such as wide bandgap and fast switching speed. However, the high-speed switching of SiC MOSFETs can lead to bridge arm crosstalk. Specifically, the high-speed switching of a SiC device can cause voltage changes between the gate and source of a SiC MOSFET in the off-state, leading to false turn-on of the bridge arm. This not only affects the stability of the device but may also cause EMI (Electromagnetic Interference) to surrounding electronic components. Summary of the Invention

[0005] The purpose of this invention is to provide a crosstalk suppression circuit, device, drive system, and vehicle to suppress bridge arm crosstalk without requiring additional control signals.

[0006] In a first aspect, embodiments of the present invention provide a crosstalk suppression circuit, comprising: a first crosstalk suppression sub-circuit, a first terminal of the first crosstalk suppression sub-circuit being adapted to connect to the control terminal of any power device in a half-bridge circuit, a second terminal of the first crosstalk suppression sub-circuit being adapted to connect to a first ground signal, and the first crosstalk suppression sub-circuit being used to connect the first terminal and the second terminal of the first crosstalk suppression sub-circuit to discharge the crosstalk current when crosstalk current flows out from the control terminal of the power device.

[0007] In addition, the crosstalk suppression circuit of the present invention may also have the following additional technical features:

[0008] According to an embodiment of the present invention, the third terminal of the first crosstalk suppression sub-circuit is adapted to connect to the active Miller clamp pin of the driving circuit; wherein, the first crosstalk suppression sub-circuit is used to output a first control signal to the third terminal of the first crosstalk suppression sub-circuit when crosstalk current flows out from the control terminal of the power device, so as to realize active Miller clamping, and in response to the first control signal, to connect the first terminal and the second terminal of the first crosstalk suppression sub-circuit.

[0009] According to an embodiment of the present invention, the crosstalk suppression circuit further includes: a second crosstalk suppression sub-circuit, a first terminal of the second crosstalk suppression sub-circuit being adapted to connect to a desaturation pin of the driving circuit, a second terminal of the second crosstalk suppression sub-circuit being adapted to connect to a second ground signal, and the second crosstalk suppression sub-circuit being used to connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit when crosstalk current flows into the desaturation pin, so as to discharge or store the crosstalk current.

[0010] According to one embodiment of the present invention, the first terminal of the second crosstalk suppression sub-circuit is adapted to be connected to the desaturation pin through the desaturation detection unit; the third terminal of the second crosstalk suppression sub-circuit is adapted to be connected to the desaturation pin of the driving circuit; wherein, the second crosstalk suppression sub-circuit is used to output a second control signal to the third terminal of the second crosstalk suppression sub-circuit when the crosstalk current flows to the desaturation pin through the desaturation detection unit, and in response to the second control signal, connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit.

[0011] According to one embodiment of the present invention, the first crosstalk suppression sub-circuit includes a first switch and a first inductor. The first end of the first switch is connected to the first end of the first inductor and serves as the first end of the first crosstalk suppression sub-circuit. The second end of the first switch serves as the second end of the first crosstalk suppression sub-circuit. The control end of the first switch is connected to the second end of the first inductor and serves as the third end of the first crosstalk suppression sub-circuit.

[0012] According to one embodiment of the present invention, the first crosstalk suppression sub-circuit includes: a first switch transistor and a first resistor; a first terminal of the first switch transistor is connected to a first terminal of the first resistor and serves as a first terminal of the first crosstalk suppression sub-circuit; a second terminal of the first switch transistor serves as a second terminal of the first crosstalk suppression sub-circuit; and a control terminal of the first switch transistor is connected to a second terminal of the first resistor and serves as a third terminal of the first crosstalk suppression sub-circuit.

[0013] According to one embodiment of the present invention, the first crosstalk suppression sub-circuit further includes a first diode, the cathode of the first diode being connected to a first terminal of the first switching transistor, and the anode of the first diode being connected to a control terminal of the first switching transistor.

[0014] According to one embodiment of the present invention, the second crosstalk suppression sub-circuit includes a second switch and a first capacitor; the first terminal of the second switch serves as the first terminal of the second crosstalk suppression sub-circuit, the second terminal of the second switch is connected to the first terminal of the first capacitor, the control terminal of the second switch serves as the third terminal of the second crosstalk suppression sub-circuit, and the second terminal of the first capacitor serves as the second terminal of the second crosstalk suppression sub-circuit.

[0015] According to one embodiment of the present invention, the second crosstalk suppression sub-circuit further includes a third resistor, which is connected in parallel with the first capacitor.

[0016] According to one embodiment of the present invention, both the second switching transistor and the first switching transistor in the first crosstalk suppression sub-circuit are PNP type transistors.

[0017] Secondly, embodiments of the present invention provide another crosstalk suppression circuit, including: a second crosstalk suppression sub-circuit, a first terminal of the second crosstalk suppression sub-circuit adapted to connect to a desaturation pin of a driving circuit, a second terminal of the second crosstalk suppression sub-circuit adapted to connect to a second ground signal, and the second crosstalk suppression sub-circuit used to connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit when crosstalk current flows to the desaturation pin, so as to discharge or store the crosstalk current.

[0018] In addition, the crosstalk suppression circuit of the present invention may also have the following additional technical features:

[0019] According to one embodiment of the present invention, the first terminal of the second crosstalk suppression sub-circuit is adapted to be connected to the desaturation pin through the desaturation detection unit, and the third terminal of the second crosstalk suppression sub-circuit is adapted to be connected to the desaturation pin of the driving circuit; wherein, the second crosstalk suppression sub-circuit is used to output a second control signal to the third terminal of the second crosstalk suppression sub-circuit when the crosstalk current flows to the desaturation pin through the desaturation detection unit, and in response to the second control signal, connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit.

[0020] According to one embodiment of the present invention, the second crosstalk suppression sub-circuit includes a second switch and a first capacitor; the first terminal of the second switch serves as the first terminal of the second crosstalk suppression sub-circuit, the second terminal of the second switch is connected to the first terminal of the first capacitor, the control terminal of the second switch serves as the third terminal of the second crosstalk suppression sub-circuit, and the second terminal of the first capacitor serves as the second terminal of the second crosstalk suppression sub-circuit.

[0021] Thirdly, embodiments of the present invention provide a crosstalk suppression device, comprising: a half-bridge circuit, including a first power device and a second power device connected in series; and the crosstalk suppression circuit described in the first or second aspect of the embodiments.

[0022] In addition, the crosstalk suppression device of the present invention may also have the following additional technical features:

[0023] According to one embodiment of the present invention, the number of crosstalk suppression circuits is two, and the two crosstalk suppression circuits correspond one-to-one with the first power device and the second power device.

[0024] Fourthly, embodiments of the present invention provide a driving system, including: a half-bridge circuit, including a first power device and a second power device connected in series; a crosstalk suppression circuit as described in the first aspect embodiment; and a driving circuit for outputting a first driving signal to the control terminal of the first power device and outputting a second driving signal to the control terminal of the second power device, wherein the first driving signal and the second driving signal are complementary.

[0025] Fifthly, embodiments of the present invention provide a vehicle including the drive system described in the fourth aspect embodiment.

[0026] The crosstalk suppression circuit, device, drive system, and vehicle of the present invention, through the setting of the first crosstalk suppression sub-circuit, connect its first end to the control terminal of any power device in the half-bridge circuit, and connect its second end to the first ground signal. When crosstalk current flows out of the control terminal of the power device, the first end and the second end of the first crosstalk suppression sub-circuit are connected to discharge the crosstalk current, thereby suppressing bridge arm crosstalk without the need for additional control signals.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the crosstalk suppression circuit according to an embodiment of the present invention;

[0029] Figure 2This is a schematic diagram of the crosstalk suppression circuit according to another embodiment of the present invention;

[0030] Figure 3 This is a circuit topology diagram of a crosstalk suppression circuit according to a specific embodiment of the present invention;

[0031] Figure 4 This is a circuit topology diagram of a crosstalk suppression circuit according to another specific embodiment of the present invention;

[0032] Figure 5 This is a circuit topology diagram of a crosstalk suppression circuit according to another specific embodiment of the present invention;

[0033] Figure 6 This is a flowchart illustrating crosstalk suppression of a half-bridge circuit, an example of the present invention.

[0034] Figure 7 This is a schematic diagram of the crosstalk suppression circuit according to another embodiment of the present invention;

[0035] Figure 8 This is a structural block diagram of the crosstalk suppression device according to an embodiment of the present invention;

[0036] Figure 9 This is a structural block diagram of the driving system according to an embodiment of the present invention;

[0037] Figure 10 This is a structural block diagram of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0039] The following description, with reference to the accompanying drawings, describes crosstalk suppression circuits, devices, drive systems, and vehicles according to embodiments of the present invention.

[0040] In power electronic equipment, crosstalk of power devices refers to the electromagnetic interference phenomenon caused by the operation of power devices in a half-bridge circuit. In a half-bridge circuit, the upper and lower power devices generate rapid changes in voltage and current during high-speed switching. Due to the presence of junction capacitance in the power devices, interference signals are introduced under rapid voltage and current changes, causing crosstalk current to be generated at the control terminal of the power devices. This current can cause positive or negative spikes, which can easily lead to false switching or damage of the bridge arm.

[0041] To address this, the present invention proposes a crosstalk suppression circuit. When crosstalk current flows out of the control terminal of the power device, the crosstalk current is discharged through the first crosstalk suppression sub-circuit, thus suppressing the crosstalk of the bridge arm without the need for additional control signals.

[0042] Figure 1 This is a schematic diagram of the crosstalk suppression circuit according to an embodiment of the present invention.

[0043] like Figure 1 As shown, the crosstalk suppression circuit 100 includes: a first crosstalk suppression sub-circuit 10.

[0044] The first terminal of the first crosstalk suppression sub-circuit 10 is adapted to connect to the control terminal of any power device VT in the half-bridge circuit 200. Figure 1 Taking the lower bridge arm power device of the half-bridge circuit 200 as an example, the second terminal of the first crosstalk suppression sub-circuit 10 is adapted to connect the first ground signal. The first crosstalk suppression sub-circuit 10 is used to connect the first terminal and the second terminal of the first crosstalk suppression sub-circuit 10 to discharge the crosstalk current when the crosstalk current flows out from the control terminal of the power device VT.

[0045] For example, the first ground signal can be provided by the driving circuit 300, such as the auxiliary power supply negative voltage of the driving circuit 300, that is, the second terminal of the first crosstalk suppression sub-circuit 10 is adapted to be connected to the auxiliary power supply negative voltage pin VEE of the driving circuit 300. Thus, no additional ground signal is required.

[0046] Specifically, see Figure 1 Taking the suppression of crosstalk in the power device VT of the lower arm of the half-bridge circuit 200 as an example, when the power device VT of the lower arm is turned off (the power device of the upper arm is turned on), positive bridge arm crosstalk occurs in the drive circuit of the power device VT of the lower arm. The crosstalk current flows from the control terminal of VT (such as the gate of the MOSFET or the base of the transistor) to the first terminal of the first crosstalk suppression sub-circuit 10. At this time, the first crosstalk suppression sub-circuit 10 connects the first terminal and the second terminal under the action of the crosstalk current, providing a low-impedance path to the first ground signal and preventing the voltage rise of the VT control terminal. Thus, crosstalk suppression is achieved, and the whole process does not require additional control signals and does not increase the additional losses of the drive circuit 300.

[0047] In some embodiments of the present invention, see Figure 1 The third terminal of the first crosstalk suppression sub-circuit 10 is adapted to connect to the active Miller clamp pin CLAM of the drive circuit 300; wherein, the first crosstalk suppression sub-circuit 10 is used to output a first control signal to the third terminal of the first crosstalk suppression sub-circuit 10 when crosstalk current flows out from the control terminal of the power device VT, so as to realize active Miller clamping, and in response to the first control signal, to connect the first terminal and the second terminal of the first crosstalk suppression sub-circuit 10.

[0048] In this embodiment, the drive circuit 300 may be equipped with an active Miller clamping function. This function refers to the continuous monitoring of the voltage at the control terminal of the power device VT after the drive circuit 300 outputs a turn-off signal. If the voltage is detected to rise to the Miller clamping threshold due to Miller current, the internal clamping circuit of the drive circuit 300 is immediately activated. This activates the built-in switching device M2 through logic control, rapidly dissipating the Miller current and thus suppressing crosstalk between the upper and lower bridge arms of the half-bridge circuit 200. However, in actual use, due to the influence of the on-resistance of the active Miller clamping pin CLAM in the drive circuit 300, the active Miller clamping function may fail to suppress bridge arm crosstalk. To address this, the present invention connects the third terminal of the first crosstalk suppression sub-circuit 10 to the active Miller clamp pin CLAM. When crosstalk current flows out from the control terminal of the power device VT, the active Miller clamp function works normally for crosstalk with small di / dt, i.e., for crosstalk with large di / dt, the first crosstalk suppression sub-circuit 10 works, achieving the combined effect of the two, improving the crosstalk suppression efficiency, and solving the problem of active Miller clamp failure during the driving process.

[0049] In some embodiments of the present invention, such as Figure 2 As shown, the crosstalk suppression circuit 100 further includes a second crosstalk suppression sub-circuit 20.

[0050] See Figure 2 The first terminal of the second crosstalk suppression sub-circuit 20 is adapted to be connected to the desaturation pin DESAT of the drive circuit 300; the second terminal of the second crosstalk suppression sub-circuit 20 is adapted to be connected to the second ground signal GND. The second crosstalk suppression sub-circuit 20 is used to connect the first terminal and the second terminal when crosstalk current flows to the desaturation pin DESAT, so as to discharge or store crosstalk current.

[0051] Specifically, see Figure 2 Taking the power device VT of the lower bridge arm of the half-bridge circuit 200 as an example, when the power device VT of the lower bridge arm is turned off (the power device of the upper bridge arm is turned on), positive crosstalk occurs in the drive circuit of the power device VT of the lower bridge arm. The crosstalk current flows from the control terminal of VT to the first terminal of the first crosstalk suppression sub-circuit 10. At this time, the first crosstalk suppression sub-circuit 10 connects its first and second terminals under the action of the crosstalk current, providing a low-impedance path to the first ground signal and preventing the voltage rise at the control terminal of VT. At the same time, when the crosstalk current flows to the desaturation pin DESAT, the first and second terminals of the second crosstalk suppression sub-circuit 20 can be connected through the second crosstalk suppression sub-circuit 20, providing a low-impedance path to the second ground signal GND, thereby suppressing crosstalk.

[0052] In some embodiments of the present invention, see Figure 2The first terminal of the second crosstalk suppression sub-circuit 20 is adapted to be connected to the desaturation pin DESAT through the desaturation detection unit, and the third terminal of the second crosstalk suppression sub-circuit 20 is adapted to be connected to the desaturation pin of the drive circuit 300; wherein, the second crosstalk suppression sub-circuit 20 is used to output a second control signal to the third terminal of the second crosstalk suppression sub-circuit 20 when the crosstalk current flows to the desaturation pin DESAT through the desaturation detection unit, and in response to the second control signal, connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit 20.

[0053] In this embodiment, the driving circuit 300 may be equipped with a desaturation function, which refers to the function of detecting desaturation through a desaturation detection unit (which may include...). Figure 2 The second resistor R2 shown monitors the voltage U between the high-voltage and low-voltage terminals of the power device VT. 高低 , will U 高低 Compared with the benchmark value V desat The system compares the current and determines whether an overcurrent or short circuit occurs, triggering desaturation protection to prevent power devices from being damaged by overheating. Under normal conditions, when power device VT is on, U... 高低 Under low voltage conditions; in abnormal conditions, when overcurrent or short circuit occurs, the power device VT exits the saturation region, U 高低 A sharp increase (desaturation phenomenon). If U 高低 If the voltage exceeds the threshold Vdesat (e.g., 7-10V) and remains there for a certain period of time (to avoid false triggering), the drive circuit 300 will turn on the logic control switching device M1 to make U 高低 It discharges to ground (GND); at the same time, it can also shut down the power device VT and trigger a fault signal.

[0054] By configuring the second crosstalk suppression sub-circuit 20, a second control signal can be output to the third terminal of the second crosstalk suppression sub-circuit 20 when crosstalk current flows to the desaturation pin DESAT. In response to the second control signal, the first and second terminals of the second crosstalk suppression sub-circuit 20 are connected to store or release the crosstalk current. Therefore, combined with the desaturation protection function, when the switching speed of the power device VT is too high, causing crosstalk in the desaturation circuit, the crosstalk current will be stored and released through the second crosstalk suppression sub-circuit 20, achieving crosstalk suppression and solving the problem of false triggering of desaturation protection due to crosstalk.

[0055] In some examples of the present invention, such as Figure 3As shown, the first crosstalk suppression sub-circuit 10 includes a first switch Q1 and a first inductor L1. The first end of the first switch Q1 is connected to the first end of the first inductor L1 and serves as the first end of the first crosstalk suppression sub-circuit 10. The second end of the first switch Q1 serves as the second end of the first crosstalk suppression sub-circuit 10. The control end of the first switch Q1 is connected to the second end of the first inductor L1 and serves as the third end of the first crosstalk suppression sub-circuit 10.

[0056] In other examples of the invention, such as Figure 4 As shown, the first crosstalk suppression sub-circuit 10 includes: a first switch Q1 and a first resistor R1; wherein, the first terminal of the first switch Q1 is connected to the first terminal of the first resistor R1 and serves as the first terminal of the first crosstalk suppression sub-circuit 10, the second terminal of the first switch Q1 serves as the second terminal of the first crosstalk suppression sub-circuit 10, and the control terminal of the first switch Q1 is connected to the second terminal of the first resistor R1 and serves as the third terminal of the first crosstalk suppression sub-circuit 10.

[0057] Figure 3 The example shown is the same as Figure 4 The difference between the examples shown is that... Figure 3 The crosstalk current flows through the first inductor L1 to the control terminal of the first switch Q1. Figure 4 The crosstalk current flows through the first resistor R1 to the control terminal of the first switch Q1. Figure 3 By using the first inductor L1, the real-time performance of crosstalk suppression can be improved. The larger the interference spike, the faster the interference suppression action. This example can be adapted to SiC MOS devices with high switching speed. Figure 4 The example shown is compatible with IGBTs (Insulated-Gate Bipolar Transistors). IGBTs have a lower switching speed than SiC MOS transistors, and therefore do not have high requirements for fast bridge arm crosstalk suppression. Figure 3 The example shown demonstrates how eliminating the power inductor (in the case of the first inductor L1) can reduce costs and achieve bridge arm crosstalk suppression at minimal cost.

[0058] See Figure 3 , Figure 4 Taking the suppression of crosstalk in the second power device VT2 as an example, when the second power device VT2 is turned off and the first power device VT1 is turned on, positive bridge arm crosstalk will occur in the drive circuit of VT2. The crosstalk current flows from the control terminal (such as the gate) of VT2 to the drive current limiting resistor R4, and then through the first inductor L1 ( Figure 3 ) or the first resistor R1 ( Figure 4The current flows to the control terminal of the first switching transistor Q1, turning Q1 on. The first crosstalk suppression sub-circuit 10 operates, providing a low-impedance path to the auxiliary power negative voltage pin VEE of the drive circuit 300 (including drive chips U1 and U2). The crosstalk current flows to VEE through Q1, thereby preventing the gate voltage of VT2 from rising. When VT1 is turned on, Q1 is turned off, which does not affect the normal switching of the power device.

[0059] In some examples of the invention, see Figure 3 , Figure 4 The first crosstalk suppression sub-circuit 10 also includes a first diode D1, the cathode of the first diode D1 is connected to the first terminal of the first switch Q1, and the anode of the first diode D1 is connected to the control terminal of the first switch Q1.

[0060] By using the first diode D1 in conjunction with the first inductor L1 or the first resistor R1, the control terminal voltage of the power device VT can be better clamped, preventing the power device VT from being mistakenly turned on due to the Miller effect or parasitic oscillations. Furthermore, when negative bridge arm crosstalk occurs, the first diode D1 turns on, causing Q1 to turn on, allowing the crosstalk current to be discharged to VEE, thus suppressing crosstalk. Simultaneously, the desaturation circuit diode D4 turns on, allowing the crosstalk current to be discharged to GND, achieving crosstalk suppression.

[0061] In some examples of the invention, see Figure 3 , Figure 4 The second crosstalk suppression sub-circuit 20 includes a second switch Q2 and a first capacitor C1; the first end of the second switch Q2 serves as the first end of the second crosstalk suppression sub-circuit 20, the second end of the second switch Q2 is connected to the first end of the first capacitor C1, the control end of the second switch Q2 is adapted to be connected to the desaturation pin DESAT, and the second end of the first capacitor C1 serves as the second end of the second crosstalk suppression sub-circuit 20.

[0062] Specifically, the second resistor R2 can also clamp the voltage at the control terminal of the second switch Q2. For example, to suppress crosstalk in the second power device VT2, see... Figure 3 , Figure 4 When the crosstalk current flows to the desaturation DESAT pin, the crosstalk current also flows through the second resistor R2 to the control terminal of the second switch Q2, causing the second switch Q2 to conduct. The second crosstalk suppression sub-circuit 20 works, providing a low-impedance path to the second ground signal GND. The crosstalk current can be stored in the first capacitor C1, thereby suppressing bridge arm crosstalk and preventing the drive circuit from falsely triggering the desaturation protection.

[0063] In some examples of the present invention, such as Figure 5 As shown, the second crosstalk suppression sub-circuit 20 also includes a third resistor R3, which is connected in parallel with the first capacitor C1.

[0064] See Figure 5 When the second crosstalk suppression sub-circuit 20 is working, providing a low-impedance path to the second ground signal GND, the crosstalk current can be stored in the first capacitor C1 and discharged to the second ground signal GND at the same time, thereby better suppressing bridge arm crosstalk and preventing the drive circuit from falsely triggering the desaturation protection.

[0065] Optionally, the second crosstalk suppression sub-circuit 20 may not include the first capacitor C1 mentioned above, but only the second switch Q2 and the third resistor R3. When the second crosstalk suppression sub-circuit 20 is working and provides a low-impedance path to the second ground signal GND, the crosstalk current can be discharged to the second ground signal GND, thereby suppressing bridge arm crosstalk and preventing the drive circuit from falsely triggering the desaturation protection.

[0066] For example, see Figure 3 , Figure 4 , Figure 5 Both the first switching transistor Q1 and the second switching transistor Q2 are PNP transistors. PNP transistors have strong anti-interference ability and good thermal stability. The specific type can be selected according to the needs (such as cost).

[0067] For example, the resistor R1, inductor L1, capacitor C1, etc. in the crosstalk suppression sub-circuit can be selected as needed to flexibly adjust the crosstalk suppression effect and meet the needs of different power device platform applications.

[0068] in addition, Figures 2-5 Diodes D2 and D3, capacitors C2 and C3, resistors R4 and R5, and Zener diodes D5 and D6 are all components of the peripheral circuit when the driver circuit 300 drives the half-bridge circuit 200, in order to better meet the driving requirements.

[0069] The following is combined Figure 5 , Figure 6 The working principle of the crosstalk suppression circuit in this embodiment of the invention is described below:

[0070] like Figure 5 As shown, a first crosstalk suppression sub-circuit 10 is formed by adding components such as a first inductor L1, a first diode D1, and a first switch Q2 to suppress bridge arm crosstalk in the drive circuit; a second crosstalk suppression sub-circuit 20 is formed by adding components such as a second switch Q2, a first capacitor C1, and a third resistor R3 to suppress desaturated bridge arm crosstalk, thereby achieving full-process bridge arm crosstalk suppression in the drive circuit.

[0071] Taking a SiC MOSFET as an example, with PNP transistors Q1 and Q2 as the first and second switching transistors, and considering the suppression of crosstalk in the VT2 drive circuit: When the drive circuit 300 controls the power device VT2 to turn off and VT1 to turn on, positive bridge arm crosstalk occurs in the VT2 drive circuit. The crosstalk current flows from the gate of VT2 to R4. At this time, current flows through the BE terminal of transistor Q1, causing Q1 to turn on. The first crosstalk suppression sub-circuit 10 operates, providing a low-impedance path to the VEE pin to prevent the gate voltage of VT2 from rising. When the crosstalk current flows into the desaturation DESAT pin, current flows through the BE terminal of transistor Q2, causing Q2 to turn on. The first crosstalk suppression sub-circuit 20 operates, providing a low-impedance path to GND to suppress bridge arm crosstalk and prevent the drive circuit from falsely triggering the desaturation protection. When VT2 is turned on, Q1 and Q2 are turned off, and the normal switching of the power device is not affected. As can be seen, when subjected to positive bridge arm crosstalk, for the drive circuit, transistor Q1 is triggered to conduct, thereby suppressing the positive bridge arm crosstalk; for the desaturation circuit, transistor Q2 is triggered to conduct, thereby suppressing the positive bridge arm crosstalk. Figure 6 As shown.

[0072] See Figure 5 When negative bridge arm crosstalk occurs in the drive circuit, the first diode D1 conducts, which in turn turns on the switching transistor Q1, allowing the negative crosstalk current to be discharged to VEE. Simultaneously, when the negative crosstalk current flows to the desaturation pin DESAT, the diode D4 in the desaturation circuit conducts, discharging the negative crosstalk current to GND. Therefore, when negative bridge arm crosstalk occurs, for the drive circuit, diode D1 is first triggered to conduct, which in turn triggers transistor Q1 to conduct, achieving negative bridge arm crosstalk suppression; for the desaturation circuit, diode D4 is triggered to conduct, achieving negative bridge arm crosstalk suppression. Figure 6 As shown.

[0073] This crosstalk suppression circuit 100 solves the problem that the active Miller clamping function of the drive circuit 300 is not ideal due to the excessive distance between the drive circuit 300 and the power device VT, caused by parasitic inductances Ln1 and Ln2. By adding components L1, D1, and Q1, the circuit utilizes the parasitic inductance of the loop. When the current change rate is low, the active Miller clamping function works normally, providing a low-impedance path to VEE and achieving crosstalk suppression. When the current change rate is large, the crosstalk current is too large. At this time, the active Miller clamping function is affected by the parasitic inductance and L1, and cannot discharge the crosstalk current in time. The crosstalk current causes the transistor Q1 to conduct quickly, while providing an even lower impedance path to VEE, thus achieving crosstalk suppression.

[0074] Therefore, this invention achieves bridge arm crosstalk suppression by reusing the active Miller clamp circuit and desaturation circuit, adding only a few components, without requiring additional control signals, thus solving bridge arm crosstalk in a low-cost manner. Specifically, the bridge arm crosstalk suppression method of this invention mainly includes two types:

[0075] The first type is the active control mode.

[0076] When the drive circuit 300 controls the power device VT to turn off, the active Miller clamp circuit is turned on, and the transistor Q1 is turned on. Both the positive and negative crosstalk currents on the drive circuit can be discharged through the transistor Q1 and the active Miller clamp circuit, realizing active control of the voltage change of the gate and source of the power device. This can suppress the bridge arm crosstalk caused by the high-speed switching of the power device, and the greater the crosstalk change rate, the faster the trigger interference suppression.

[0077] The second type is passive control mode.

[0078] When the drive circuit 300 controls the power device VT to turn off, if positive bridge arm crosstalk occurs, it will cause transistors Q1 and Q2 to conduct, and the crosstalk suppression sub-circuit will work to achieve bridge arm crosstalk suppression. That is, if other interference is caused to the junction capacitance of the power device during the power device's off period, it will also have a suppressive effect, thus achieving passive gate-source control.

[0079] The present invention also proposes another crosstalk suppression circuit.

[0080] like Figure 7 As shown, the crosstalk suppression circuit 100 includes a second crosstalk suppression sub-circuit 20. A first terminal of the second crosstalk suppression sub-circuit 20 is adapted to connect to the desaturation pin DESAT of the drive circuit 300, and a second terminal of the second crosstalk suppression sub-circuit 20 is adapted to connect to the second ground signal GND. The second crosstalk suppression sub-circuit 20 is used to connect its first and second terminals when crosstalk current flows to the desaturation pin DESAT, in order to discharge or store crosstalk current.

[0081] In some embodiments of the present invention, see Figure 7 The first terminal of the second crosstalk suppression sub-circuit 20 is adapted to pass through a desaturation detection unit (which may include...) Figure 2 The second resistor R2 shown is connected to the desaturation pin DESAT, and the third terminal of the second crosstalk suppression sub-circuit 20 is adapted to be connected to the desaturation pin of the drive circuit 300.

[0082] The second crosstalk suppression sub-circuit 20 is used to output a second control signal to the third terminal of the second crosstalk suppression sub-circuit 20 when the crosstalk current flows to the desaturation pin DESAT through the desaturation detection unit, and in response to the second control signal, connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit 20.

[0083] In some embodiments of the present invention, see Figure 3The second crosstalk suppression sub-circuit 20 includes a second switch Q2 and a first capacitor C1; the first terminal of the second switch Q2 serves as the first terminal of the second crosstalk suppression sub-circuit 20, the second terminal of the second switch Q2 is connected to the first terminal of the first capacitor C1, the control terminal of the second switch Q2 serves as the third terminal of the second crosstalk suppression sub-circuit 20, and the second terminal of the first capacitor C1 serves as the second terminal of the second crosstalk suppression sub-circuit 20.

[0084] It should be noted that for other specific embodiments of the crosstalk suppression circuit 100 of the present invention, please refer to the description of the specific embodiments of the crosstalk suppression circuit 100 in the above embodiments.

[0085] Figure 8 This is a structural block diagram of the crosstalk suppression device according to an embodiment of the present invention.

[0086] like Figure 8 As shown, the crosstalk suppression device 1000 includes: a half-bridge circuit 200, including a first power device VT1 and a second power device VT2 connected in series; and the crosstalk suppression circuit 100 of the above embodiment.

[0087] In some embodiments of the present invention, such as Figure 3 , Figure 4 , Figure 5 As shown, there are two crosstalk suppression circuits 100, and the two crosstalk suppression circuits 100 correspond one-to-one with the first power device VT1 and the second power device VT2.

[0088] Figure 9 This is a schematic diagram of the drive system according to an embodiment of the present invention.

[0089] like Figure 9 As shown, the drive system 2000 includes: a half-bridge circuit 200, a crosstalk suppression circuit 100 as described in the above embodiment, and a drive circuit 300.

[0090] See Figure 9 The half-bridge circuit 200 includes a first power device VT1 and a second power device VT2 connected in series; the drive circuit 300 is used to output a first drive signal to the control terminal of the first power device VT1 and output a second drive signal to the control terminal of the second power device VT2.

[0091] The first driving signal and the second driving signal are complementary. For example, the first driving signal is a turn-off signal and the second driving signal is a turn-on signal; or, the first driving signal is a turn-on signal and the second driving signal is a turn-off signal.

[0092] Figure 10 This is a schematic diagram of the vehicle structure according to an embodiment of the present invention.

[0093] like Figure 10As shown, the vehicle 3000 includes: the drive system 2000 of the above embodiment.

[0094] In summary, the crosstalk suppression circuit, device, drive system, and vehicle of this invention, by reusing active Miller circuit and desaturation circuit components and adding components such as transistors and diodes, achieve bridge arm crosstalk suppression between the power device drive circuit and the desaturation circuit. This solves the problem of false triggering of desaturation protection due to bridge arm crosstalk and the failure of active Miller clamping during the drive process at a low cost, achieving full-cycle suppression of both positive and negative bridge arm crosstalk. Furthermore, the entire suppression process does not increase the gate charge of the power device, does not cause additional losses in the drive circuit, and requires no additional control signals.

[0095] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0096] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0097] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0098] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0099] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0100] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0101] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0102] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A crosstalk suppression circuit (100), characterized in that, include: A first crosstalk suppression sub-circuit (10) is provided, wherein a first end of the first crosstalk suppression sub-circuit (10) is adapted to connect to the control terminal of any power device (VT) in the half-bridge circuit (200), and a second end of the first crosstalk suppression sub-circuit (10) is adapted to connect to a first ground signal. The first crosstalk suppression sub-circuit (10) is used to connect the first end and the second end of the first crosstalk suppression sub-circuit (10) to discharge the crosstalk current when the crosstalk current flows out from the control terminal of the power device (VT).

2. The crosstalk suppression circuit (100) according to claim 1, characterized in that, The third terminal of the first crosstalk suppression sub-circuit (10) is adapted to be connected to the active Miller clamp pin (CLAM) of the drive circuit (300); The first crosstalk suppression sub-circuit (10) is used to output a first control signal to the third terminal of the first crosstalk suppression sub-circuit (10) when crosstalk current flows out from the control terminal of the power device (VT) to realize active Miller clamping, and to connect the first terminal and the second terminal of the first crosstalk suppression sub-circuit (10) in response to the first control signal.

3. The crosstalk suppression circuit (100) according to claim 1, characterized in that, The crosstalk suppression circuit (100) further includes: The second crosstalk suppression sub-circuit (20) has a first end adapted to be connected to the desaturation pin (DESAT) of the drive circuit (300), and a second end adapted to be connected to the second ground signal (GND). The second crosstalk suppression sub-circuit (20) is used to connect the first end and the second end of the second crosstalk suppression sub-circuit (20) when the crosstalk current flows to the desaturation pin (DESAT) in order to discharge or store the crosstalk current.

4. The crosstalk suppression circuit (100) according to claim 3, characterized in that, The first end of the second crosstalk suppression sub-circuit (20) is adapted to be connected to the desaturation pin (DESAT) through the desaturation detection unit, and the third end of the second crosstalk suppression sub-circuit (20) is adapted to be connected to the desaturation pin of the driving circuit (300); The second crosstalk suppression sub-circuit (20) is used to output a second control signal to the third terminal of the second crosstalk suppression sub-circuit (20) when the crosstalk current flows through the desaturation detection unit to the desaturation pin (DESAT), and in response to the second control signal, connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit (20).

5. The crosstalk suppression circuit (100) according to claim 2, characterized in that, The first crosstalk suppression sub-circuit (10) includes a first switch (Q1) and a first inductor (L1). The first end of the first switch (Q1) is connected to the first end of the first inductor (L1) and serves as the first end of the first crosstalk suppression sub-circuit (10). The second end of the first switch (Q1) serves as the second end of the first crosstalk suppression sub-circuit (10). The control end of the first switch (Q1) is connected to the second end of the first inductor (L1) and serves as the third end of the first crosstalk suppression sub-circuit (10).

6. The crosstalk suppression circuit (100) according to claim 2, characterized in that, The first crosstalk suppression sub-circuit (10) includes: a first switch (Q1) and a first resistor (R1). The first terminal of the first switch (Q1) is connected to the first terminal of the first resistor (R1) and serves as the first terminal of the first crosstalk suppression sub-circuit (10). The second terminal of the first switch (Q1) serves as the second terminal of the first crosstalk suppression sub-circuit (10). The control terminal of the first switch (Q1) is connected to the second terminal of the first resistor (R1) and serves as the third terminal of the first crosstalk suppression sub-circuit (10).

7. The crosstalk suppression circuit (100) according to claim 5 or 6, characterized in that, The first crosstalk suppression sub-circuit (10) further includes a first diode (D1), the cathode of the first diode (D1) is connected to the first terminal of the first switch (Q1), and the anode of the first diode (D1) is connected to the control terminal of the first switch (Q1).

8. The crosstalk suppression circuit (100) according to claim 4, characterized in that, The second crosstalk suppression sub-circuit (20) includes a second switch (Q2) and a first capacitor (C1); the first terminal of the second switch (Q2) serves as the first terminal of the second crosstalk suppression sub-circuit (20), the second terminal of the second switch (Q2) is connected to the first terminal of the first capacitor (C1), the control terminal of the second switch (Q2) serves as the third terminal of the second crosstalk suppression sub-circuit (20), and the second terminal of the first capacitor (C1) serves as the second terminal of the second crosstalk suppression sub-circuit (20).

9. The crosstalk suppression circuit (100) according to claim 8, characterized in that, The second crosstalk suppression sub-circuit (20) further includes a third resistor (R3), which is connected in parallel with the first capacitor (C1).

10. The crosstalk suppression circuit (100) according to claim 9, characterized in that, Both the second switch (Q2) and the first switch (Q1) in the first crosstalk suppression sub-circuit (10) are PNP type transistors.

11. A crosstalk suppression circuit (100), characterized in that, include: The second crosstalk suppression sub-circuit (20) has a first end adapted to be connected to the desaturation pin (DESAT) of the drive circuit (300), and a second end adapted to be connected to the second ground signal (GND). The second crosstalk suppression sub-circuit (20) is used to connect the first end and the second end of the second crosstalk suppression sub-circuit (20) when the crosstalk current flows to the desaturation pin (DESAT) in order to discharge or store the crosstalk current.

12. The crosstalk suppression circuit (100) according to claim 11, characterized in that, The first end of the second crosstalk suppression sub-circuit (20) is adapted to be connected to the desaturation pin (DESAT) through the desaturation detection unit, and the third end of the second crosstalk suppression sub-circuit (20) is adapted to be connected to the desaturation pin of the driving circuit (300); The second crosstalk suppression sub-circuit (20) is used to output a second control signal to the third terminal of the second crosstalk suppression sub-circuit (20) when the crosstalk current flows through the desaturation detection unit to the desaturation pin (DESAT), and in response to the second control signal, connect the first terminal and the second terminal of the second crosstalk suppression sub-circuit (20).

13. The crosstalk suppression circuit (100) according to claim 12, characterized in that, The second crosstalk suppression sub-circuit (20) includes a second switch (Q2) and a first capacitor (C1); the first terminal of the second switch (Q2) serves as the first terminal of the second crosstalk suppression sub-circuit (20), the second terminal of the second switch (Q2) is connected to the first terminal of the first capacitor (C1), the control terminal of the second switch (Q2) serves as the third terminal of the second crosstalk suppression sub-circuit (20), and the second terminal of the first capacitor (C1) serves as the second terminal of the second crosstalk suppression sub-circuit (20).

14. A crosstalk suppression device (1000), characterized in that, include: The half-bridge circuit (200) includes a first power device (VT1) and a second power device (VT2) connected in series; The crosstalk suppression circuit (100) as described in any one of claims 1-13.

15. The crosstalk suppression device (1000) according to claim 14, characterized in that, There are two crosstalk suppression circuits (100), and each of the two crosstalk suppression circuits (100) corresponds to the first power device (VT1) and the second power device (VT2).

16. A drive system (2000), characterized in that, include: The half-bridge circuit (200) includes a first power device (VT1) and a second power device (VT2) connected in series; The crosstalk suppression circuit (100) as described in any one of claims 1-13; and The driving circuit (300) is used to output a first driving signal to the control terminal of the first power device (VT1) and output a second driving signal to the control terminal of the second power device (VT2), wherein the first driving signal and the second driving signal are complementary.

17. A vehicle (3000), characterized in that, include: The drive system (2000) as described in claim 16.

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