SIC MOS driving source circuit

Abstract

The utility model provides an SIC MOS driving source circuit, which comprises a first voltage stabilizing circuit and a second voltage stabilizing circuit, the second voltage stabilizing circuit comprises a voltage dividing circuit and a second voltage stabilizing circuit, the first port of the first voltage stabilizing circuit is connected with the output port of a first voltage source, the first port of the second voltage stabilizing circuit is connected with the second port of the first voltage stabilizing circuit, and the second port of the second voltage stabilizing circuit is connected with the output port of a second voltage source. The voltage division circuit is connected to the two ends of a first port of the second voltage stabilizing circuit and the two ends of a second port of the first voltage stabilizing circuit in parallel, the voltage division circuit comprises a third capacitor and an eighth capacitor which are connected in series, and the second port of the second voltage stabilizing circuit is used for being connected with a driving source of the SIC MOS driving controller; according to the utility model, the first voltage stabilizing circuit and the second voltage stabilizing and dividing circuit can be matched with SIC MOS models of different manufacturers, the circuit is simple and efficient, the compatibility is good, the precision is high, and the performance advantages of the SIC MOS can be better exerted.

Description

Technical Field

[0001] This utility model relates to the field of power electronic conversion technology, and in particular to a SiC MOS driving source circuit. Background Technology

[0002] In existing technologies, SiC MOS (Silicon Carbide Metal Oxide Semiconductor Field Effect Transistor) driver source circuits typically employ a separately designed auxiliary power source (SPS), or a portion of the supply voltage is drawn from a shared auxiliary power source to generate a voltage close to the SiC MOS drive voltage range. This voltage is usually referred to as the primary power supply. The primary voltage source is then further regulated and amplified before being used as the SiC MOS driver source. While the former offers a more accurate voltage range and precision, it requires a reliable design when SiC MOS manufacturers have significant differences in drive voltage; otherwise, high power consumption may occur. Replacing with compatible alternatives may necessitate rematching circuit parameters, or even modifying the transformer design if used, resulting in a large range of changes and poor compatibility. Furthermore, the separately designed auxiliary power source has low utilization and occupies more space, hindering power density improvement. The latter offers better compatibility, but due to the use of a shared system auxiliary power source, it is susceptible to influence from other power supply circuits, resulting in poor source load regulation, dynamic response, and voltage regulation accuracy. Utility Model Content

[0003] The purpose of this invention is to provide a SiC MOS driver source circuit to solve the problems of high power consumption, poor compatibility, and low accuracy of the aforementioned prior art SiCMOS driver source circuits.

[0004] This invention provides a SiC MOS driving source circuit, including a first voltage regulator circuit and a second voltage regulator / divider circuit. The second voltage regulator / divider circuit includes a voltage divider circuit and a second voltage regulator circuit. The first port of the first voltage regulator circuit is connected to the output port of the first voltage source. The first port of the second voltage regulator circuit is connected to the second port of the first voltage regulator circuit. The voltage divider circuit is connected in parallel across the first port of the second voltage regulator circuit and the second port of the first voltage regulator circuit. The voltage divider circuit includes a third capacitor and an eighth capacitor connected in series. The second port of the second voltage regulator circuit is used to connect to the driving source of the SiC MOS driving controller.

[0005] Furthermore, it also includes a capacitor filter circuit, which is connected in parallel between the first voltage source and the first voltage regulator circuit.

[0006] Furthermore, the capacitor filter circuit includes a filter capacitor.

[0007] Further, the first voltage regulator circuit includes a third resistor, a fifth resistor, a seventh resistor, a first switch, and a second voltage regulator; one end of the third resistor is connected to the positive terminal of the output port of the first voltage source and the current input terminal of the first switch, and the other end of the third resistor is connected to the control terminal of the first switch and the output terminal of the second voltage regulator; the current output terminal of the first switch is connected to one end of the fifth resistor and serves as the positive terminal of the second port of the first voltage regulator circuit, and the other end of the fifth resistor is connected to one end of the seventh resistor and the reference terminal of the second voltage regulator; the other end of the seventh resistor and the anode of the second voltage regulator are connected to the negative terminal of the output port of the first voltage source and serve as the negative terminal of the second port of the first voltage regulator circuit.

[0008] Further, the second voltage regulator circuit includes a first voltage regulator, a fourth resistor, a sixth resistor, an eighth resistor, and a first Zener diode; one end of the third capacitor is connected to the positive terminal of the second port of the first voltage regulator circuit, the output terminal of the first voltage regulator, and one end of the fourth resistor, and serves as the positive terminal of the second port of the second voltage regulator circuit; the other end of the fourth resistor is connected to the reference terminal of the first voltage regulator and one end of the sixth resistor, the other end of the sixth resistor is connected to the negative terminal of the first Zener diode, ground, the anode of the first voltage regulator, the other end of the third capacitor, one end of the eighth resistor, and one end of the eighth capacitor; one end of the eighth resistor, the other end of the eighth capacitor, and the anode of the first Zener diode are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

[0009] Furthermore, the first voltage regulator circuit includes a second Zener diode, the cathode of which is connected to the positive terminal of the output port of the first voltage source and serves as the positive terminal of the second port of the first voltage regulator circuit; the anode of which is connected to the negative terminal of the output port of the first voltage source and serves as the negative terminal of the second port of the first voltage regulator circuit.

[0010] Furthermore, the first voltage regulator circuit includes an LDO chip. The input terminal of the LDO chip is connected to the positive terminal of the output port of the first voltage source, the output terminal of the LDO chip serves as the positive terminal of the second port of the first voltage regulator circuit, and the ground terminal of the LDO chip is connected to the negative terminal of the output port of the first voltage source and serves as the negative terminal of the second port of the first voltage regulator circuit.

[0011] Further, the second voltage regulator circuit includes a sixth resistor and a first Zener diode; one end of the third capacitor and the cathode of the first Zener diode are connected to the positive terminal of the second port of the first voltage regulator circuit, and serve as the positive terminal of the second port of the second voltage regulator circuit; the other end of the third capacitor, the anode of the first Zener diode, one end of the eighth capacitor, and one end of the sixth resistor are grounded; the other end of the eighth capacitor and the other end of the sixth resistor are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

[0012] Furthermore, the second voltage regulator circuit includes a sixth resistor and a first Zener diode; one end of the third capacitor and one end of the sixth resistor are connected to the positive terminal of the second port of the first voltage regulator circuit, and serve as the positive terminal of the second port of the second voltage regulator circuit; the other end of the third capacitor, the cathode of the first Zener diode, one end of the eighth capacitor, and the other end of the sixth resistor are grounded; the other end of the eighth capacitor and the anode of the first Zener diode are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

[0013] Further, the second voltage regulator circuit includes a first voltage regulator, a fourth resistor, a sixth resistor, and an eighth resistor; one end of the third capacitor and one end of the eighth resistor are connected to the positive terminal of the second port of the first voltage regulator circuit, and serve as the positive terminal of the second port of the second voltage regulator circuit; the other end of the third capacitor, the other end of the eighth resistor, one end of the fourth resistor, one end of the eighth capacitor, and the output terminal of the first voltage regulator are grounded; the other end of the fourth resistor and one end of the sixth resistor are connected to the reference terminal of the first voltage regulator, and the anode of the first voltage regulator, the other end of the eighth capacitor, and the other end of the sixth resistor are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

[0014] The SiC MOS driving source circuit of this invention can be matched with SiC MOS models from different manufacturers through the first voltage regulator circuit and the second voltage regulator divider circuit. It is simple, efficient, compatible, and accurate, and can better bring out the performance advantages of SiC MOS, thus solving the problems mentioned in the background art. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the SiC MOS driving source circuit according to the first embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the SiC MOS driving source circuit according to the second embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the SiC MOS driving source circuit according to the third embodiment of this utility model;

[0018] Figure 4 This is a schematic diagram of the SiC MOS driving source circuit according to the fourth embodiment of this utility model;

[0019] Figure 5 This is a schematic diagram of the SiC MOS driving source circuit according to the fifth embodiment of this utility model;

[0020] Figure 6 This is a schematic diagram of the SiC MOS driving source circuit according to the sixth embodiment of this utility model;

[0021] Figure 7 This is a schematic diagram of the SiC MOS driving source circuit according to the seventh embodiment of this utility model.

[0022] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0023] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Please see Figure 1The diagram illustrates a SiC MOS driving source circuit according to a first embodiment of the present invention, including a first voltage regulator circuit and a second voltage regulator / divider circuit. The second voltage regulator / divider circuit includes a voltage divider circuit and a second voltage regulator circuit. The first port of the first voltage regulator circuit is connected to the output port of the first voltage source. The first port of the second voltage regulator circuit is connected to the second port of the first voltage regulator circuit. The voltage divider circuit is connected in parallel across the first port of the second voltage regulator circuit and the second port of the first voltage regulator circuit. The second port of the second voltage regulator circuit is used to connect to the driving source of the SiC MOS driving controller.

[0027] The first voltage source, including but not limited to various forms of step-down circuits, is used to convert mains power or various high-voltage sources to low voltage, generating a primary voltage source within a range close to the drive voltage of a SiC MOSFET (e.g., 20-26VDC, or other values ​​as required). ） .

[0028] The above-mentioned SiC MOS driver source circuit can match the optimal driving voltage of most manufacturers' SiC MOS by matching the parameters of the first and second voltage regulator circuits. It does not require separate design, has high precision, low power consumption, good compatibility, and is easy to maintain.

[0029] In one embodiment, the first port of the first voltage regulator circuit is the input port of the first voltage regulator circuit, and the second port of the first voltage regulator circuit is the output port of the first voltage regulator circuit; the first port of the second voltage regulator circuit is the input port of the second voltage regulator circuit, and the second port of the second voltage regulator circuit is the output port of the second voltage regulator circuit.

[0030] In one embodiment, such as Figure 2 As shown, the first voltage regulator circuit includes a third resistor R3, a fifth resistor R5, a seventh resistor R7, a first switch Q1, and a second voltage regulator U2. One end of the third resistor R3 is connected to the positive terminal VIN+ of the output port of the first voltage source and the current input terminal of the first switch Q1. The other end of the third resistor R3 is connected to the control terminal of the first switch Q1 and the cathode of the second voltage regulator U2. The current output terminal of the first switch Q1 is connected to one end of the fifth resistor R5 and serves as the positive terminal of the second port of the first voltage regulator circuit. The other end of the fifth resistor R5 is connected to one end of the seventh resistor R7 and the reference terminal of the second voltage regulator U2. The other end of the seventh resistor R7 and the anode of the second voltage regulator U2 are connected to the negative terminal VIN- of the output port of the first voltage source and serve as the negative terminal of the second port of the first voltage regulator circuit.

[0031] The voltage divider circuit includes a third capacitor C3 and an eighth capacitor C8 connected in series. The second voltage regulator circuit includes a first voltage regulator U1, a fourth resistor R4, a sixth resistor R6, an eighth resistor R8, and a first Zener diode ZD1. In this circuit, one end of the third capacitor C3 (one end of the voltage divider circuit) is connected to the positive terminal of the second port of the first voltage regulator circuit, the cathode (output terminal) of the first voltage regulator U1, and one end of the fourth resistor R4, and serves as the positive terminal +VS of the second port of the second voltage regulator circuit; the other end of the fourth resistor R4 is connected to the reference terminal of the first voltage regulator U1 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the negative terminal of the first Zener diode ZD1, ground GND, the anode of the first voltage regulator U1, the other end of the third capacitor C3 (the common terminal of the voltage divider circuit), one end of the eighth resistor R8, and one end of the eighth capacitor C8 (also the common terminal of the voltage divider circuit); one end of the eighth resistor R8, the other end of the eighth capacitor C8 (one end of the voltage divider circuit), and the anode of the first Zener diode ZD1 are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal -VS of the second port of the second voltage regulator circuit.

[0032] In one embodiment, the positive terminal +VS of the second port of the second voltage regulator circuit is used to connect to the positive terminal of the drive source of the SiC MOS drive controller, and the negative terminal -VS of the second port of the second voltage regulator circuit is used to connect to the negative terminal of the drive source of the SiC MOS drive controller.

[0033] The above-mentioned SiC MOS driver source circuit:

[0034] The first voltage regulator circuit precisely regulates the voltage from the first voltage source through the second voltage regulator U2, the first switch Q1, the fifth resistor R5, and the seventh resistor R7. Specifically, the third resistor R3 is a bias resistor, and the first voltage source provides bias current to the first switch Q1 and the second voltage regulator U2 through the third resistor R3, enabling the first switch Q1 and the second voltage regulator U2 to operate normally. The first switch Q1 adjusts its output current based on the change in the second voltage regulator U2, thereby adjusting the output voltage of the first voltage regulator circuit. The output voltage of the first voltage regulator circuit, after being sampled by voltage divider through the fifth resistor R5 and the seventh resistor R7, is input to the reference terminal of the second voltage regulator U2. It is compared with the internal reference voltage (e.g., 2.5V) of the second voltage regulator U2 as an error voltage, amplified, and used to adjust the second voltage regulator. The output of regulator U2 is the control terminal voltage of the first switch Q1, thereby changing the magnitude of the output current of the first switch Q1. For example, when the output voltage of the first voltage regulator circuit increases, the sampling voltage also increases, the output of the second voltage regulator U2 decreases, the output current of the first switch Q1 decreases, and thus the output voltage of the first voltage regulator circuit decreases; conversely, when the output voltage of the first voltage regulator circuit decreases, the sampling voltage also decreases, the output of the second voltage regulator U2 increases, the output current of the first switch Q1 increases, and thus the output voltage of the first voltage regulator circuit increases, thereby achieving the function of stabilizing the output voltage of the first voltage regulator circuit. Due to the use of the second voltage regulator U2, the overall output voltage source has high accuracy and stronger output current capability. Furthermore, through the parameter configuration of its RC circuit, a voltage source with low power consumption, high accuracy, and high dynamic response can be obtained.

[0035] The voltage divider circuit splits the output voltage V1 of the first voltage regulator circuit into two parts, namely the first voltage V2 and the second voltage V3. The first voltage regulator U1 in the second voltage regulator circuit further regulates the voltage. Specifically, in the second voltage regulator circuit, the first voltage regulator U1 regulates the first voltage V2. Since the first voltage regulator circuit has already improved the accuracy of the total voltage (output voltage V1), using the first voltage regulator U1 in the second voltage regulator circuit can provide a more accurate positive voltage (third output voltage V4). The voltage divider resistors (fourth resistor R4 and sixth resistor R6) can be adjusted as needed to match the different requirements of the optimal positive voltage for SICMOS operation. At the same time, the negative voltage (fourth output voltage V5) is also more stable. Furthermore, during standby, the first voltage regulator U1 and the second voltage regulator U2 consume only a very small minimum operating current, resulting in low power loss.

[0036] In one embodiment, such as Figure 3 As shown, it is similar to Figure 2 The difference in the illustrated embodiment is that the first voltage regulator circuit is simpler; specifically, Figure 3In the embodiment shown, the first voltage regulator circuit includes a second Zener diode ZD2. The cathode of the second Zener diode ZD2 is connected to the positive terminal VIN+ of the output port of the first voltage source and serves as the positive terminal of the second port of the first voltage regulator circuit. The anode of the second Zener diode ZD2 is connected to the negative terminal VIN- of the output port of the first voltage source and serves as the negative terminal of the second port of the first voltage regulator circuit.

[0037] Figure 3 In the embodiment shown, in the first voltage regulator circuit, after the output voltage V1 of the first voltage regulator circuit is regulated by the second voltage regulator diode ZD2, it is divided into the first voltage V2 and the second voltage V3 by the voltage divider circuit. The second voltage regulator circuit uses the first voltage regulator U1 to accurately regulate the third output voltage V4, so that the fourth output voltage V5 is also stabilized accordingly.

[0038] In one embodiment, such as Figure 4 As shown, it is similar to Figure 2 The difference in the illustrated embodiment is that the first voltage regulator circuit is simpler; specifically, Figure 4 In the illustrated embodiment, the first voltage regulator circuit includes an LDO chip (LDO stands for Low Drop-Out Linear Regulator). The input terminal of the LDO chip is connected to the positive terminal VIN+ of the output port of the first voltage source. The output terminal of the LDO chip serves as the positive terminal of the second port of the first voltage regulator circuit. The ground terminal of the LDO chip is connected to the negative terminal VIN- of the output port of the first voltage source and serves as the negative terminal of the second port of the first voltage regulator circuit.

[0039] Figure 4 In the embodiment shown, an LDO chip is used to precisely regulate the output voltage V1 of the first voltage regulator circuit. After being divided into a first voltage V2 and a second voltage V3 by a voltage divider circuit, the second voltage regulator circuit uses a first voltage regulator U1 to precisely regulate the third output voltage V4, thereby stabilizing the fourth output voltage V5 accordingly.

[0040] In one embodiment, such as Figure 5 As shown, it is similar to Figure 2 The difference in the illustrated embodiment is that the second voltage regulator circuit is simpler; specifically, Figure 5In the illustrated embodiment, the second voltage regulator circuit includes a sixth resistor R6 and a first Zener diode ZD1. One end of the third capacitor C3 and the cathode of the first Zener diode ZD1 are connected to the positive terminal of the second port of the first voltage regulator circuit, serving as the positive terminal +VS of the second port of the second voltage regulator circuit. The other end of the third capacitor C3, the anode of the first Zener diode ZD1, one end of the eighth capacitor C8, and one end of the sixth resistor R6 are grounded to GND. The other end of the eighth capacitor C8 and the other end of the sixth resistor R6 are connected to the negative terminal of the second port of the first voltage regulator circuit, serving as the negative terminal -VS of the second port of the second voltage regulator circuit.

[0041] Figure 5 In the embodiment shown, the first voltage regulator circuit is the same as... Figure 2 In the embodiment shown, after the total voltage is accurately regulated by the second voltage regulator U2, it is divided into a first voltage V2 and a second voltage V3 by a voltage divider circuit. The second voltage regulator circuit uses a first voltage regulator diode ZD1 to regulate the third output voltage V4, thereby stabilizing the fourth output voltage V5 accordingly.

[0042] In one embodiment, such as Figure 6 As shown, it is similar to Figure 2 The difference in the illustrated embodiment is that the second voltage regulator circuit is simpler; specifically, Figure 6 In the illustrated embodiment, the second voltage regulator circuit includes a sixth resistor R6 and a first Zener diode ZD1. One end of the third capacitor C3 and one end of the sixth resistor R6 are connected to the positive terminal of the second port of the first voltage regulator circuit, serving as the positive terminal +VS of the second port of the second voltage regulator circuit. The other end of the third capacitor C3, the cathode of the first Zener diode ZD1, one end of the eighth capacitor C8, and the other end of the sixth resistor R6 are grounded to GND. The other end of the eighth capacitor C8 and the anode of the first Zener diode ZD1 are connected to the negative terminal of the second port of the first voltage regulator circuit, serving as the negative terminal -VS of the second port of the second voltage regulator circuit.

[0043] Figure 6 In the embodiment shown, the first voltage regulator circuit is the same as... Figure 2 In the embodiment shown, after the total voltage is accurately regulated by the second voltage regulator U2, it is divided into the first voltage V2 and the second voltage V3 by the voltage divider circuit. The fourth output voltage V5 is regulated by the first voltage regulator diode ZD1 in the second voltage regulator circuit, so that the third output voltage V4 is also stabilized accordingly.

[0044] In one embodiment, such as Figure 7 As shown, it is similar to Figure 2 The difference in the illustrated embodiment is that the second voltage regulator circuit is simpler. Specifically, Figure 7In the illustrated embodiment, the second voltage regulator circuit includes a first voltage regulator U1, a fourth resistor R4, a sixth resistor R6, and an eighth resistor R8. One end of the third capacitor C3 and one end of the eighth resistor R8 are connected to the positive terminal of the second port of the first voltage regulator circuit, serving as the positive terminal +VS of the second port of the second voltage regulator circuit. The other end of the third capacitor C3, the other end of the eighth resistor R8, one end of the fourth resistor R4, one end of the eighth capacitor C8, and the cathode ground wire GND of the first voltage regulator U1 are connected. The other end of the fourth resistor R4 and one end of the sixth resistor R6 are connected to the reference terminal of the first voltage regulator U1. The anode of the first voltage regulator U1, the other end of the eighth capacitor C8, and the other end of the sixth resistor R6 are connected to the negative terminal of the second port of the first voltage regulator circuit, serving as the negative terminal -VS of the second port of the second voltage regulator circuit.

[0045] Figure 7 In the embodiment shown, the first voltage regulator circuit is the same as... Figure 2 In the embodiment shown, after the total voltage is accurately regulated by the second voltage regulator U2, it is divided into the first voltage V2 and the second voltage V3 by the voltage divider circuit. The first voltage regulator U1 in the second voltage regulator circuit accurately regulates the fourth output voltage V5, so that the third output voltage V4 is also stabilized accordingly.

[0046] In one embodiment, the SiC MOS driving source circuit further includes a capacitor filter circuit connected in parallel between the first voltage source and the first voltage regulator circuit. The capacitor filter circuit is used to filter interference in the circuit. In one embodiment, the capacitor filter circuit includes a filter capacitor C5, which is connected in parallel between the first voltage source and the first voltage regulator circuit. Alternatively, the output terminals of the first voltage source are connected to the two ends of the first port of the second voltage regulator circuit via the two ends of the filter capacitor C5.

[0047] In one embodiment, the first voltage regulator U1 and the second voltage regulator U2 are commonly used precision controllable voltage regulator chips, such as the controllable voltage regulator chip with model number TL431.

[0048] Understandably, Figure 3-7 In this embodiment, the output voltages V1, V2, V3, V4, and V5 of the first voltage regulator circuit are positioned in the same way. Figure 2 As shown in the embodiment, the voltages are respectively the voltage at the second port (output port) of the first voltage regulator circuit, the voltage across the third capacitor C3, the voltage across the eighth capacitor C8, the voltage between +VS and GND, and the voltage between GND and -VS.

[0049] In one embodiment, the first switch Q1 can be a controllable switch such as a transistor.

[0050] The technical solution of this utility model has the following advantages:

[0051] The first voltage regulator circuit and the second voltage divider circuit can be used to match SiC MOS models from different manufacturers. Overall, this driver source design is simple, efficient, compatible, and accurate, and can better leverage the performance advantages of SiC MOS.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A SiC MOS driving source circuit, characterized in that, The system includes a first voltage regulator circuit and a second voltage regulator / divider circuit. The second voltage regulator / divider circuit includes a voltage divider circuit and a second voltage regulator circuit. The first port of the first voltage regulator circuit is connected to the output port of the first voltage source. The first port of the second voltage regulator circuit is connected to the second port of the first voltage regulator circuit. The voltage divider circuit is connected in parallel across the first port of the second voltage regulator circuit and the second port of the first voltage regulator circuit. The voltage divider circuit includes a third capacitor and an eighth capacitor connected in series. The second port of the second voltage regulator circuit is used to connect to the drive source of the SiC MOS drive controller.

2. The SiC MOS driving source circuit according to claim 1, characterized in that, It also includes a capacitor filter circuit, which is connected in parallel between the first voltage source and the first voltage regulator circuit.

3. The SiC MOS driving source circuit according to claim 2, characterized in that, The capacitor filtering circuit includes a filter capacitor.

4. The SiC MOS driving source circuit according to any one of claims 1-3, characterized in that, The first voltage regulator circuit includes a third resistor, a fifth resistor, a seventh resistor, a first switch, and a second voltage regulator. One end of the third resistor is connected to the positive terminal of the output port of the first voltage source and the current input terminal of the first switch. The other end of the third resistor is connected to the control terminal of the first switch and the cathode of the second voltage regulator. The current output terminal of the first switch is connected to one end of the fifth resistor and serves as the positive terminal of the second port of the first voltage regulator circuit. The other end of the fifth resistor is connected to one end of the seventh resistor and the reference terminal of the second voltage regulator. The other end of the seventh resistor and the anode of the second voltage regulator are connected to the negative terminal of the output port of the first voltage source and serve as the negative terminal of the second port of the first voltage regulator circuit.

5. The SiC MOS driving source circuit according to any one of claims 1-3, characterized in that, The second voltage regulator circuit includes a first voltage regulator, a fourth resistor, a sixth resistor, an eighth resistor, and a first Zener diode; one end of the third capacitor is connected to the positive terminal of the second port of the first voltage regulator circuit, the cathode of the first voltage regulator, and one end of the fourth resistor, and serves as the positive terminal of the second port of the second voltage regulator circuit; the other end of the fourth resistor is connected to the reference terminal of the first voltage regulator and one end of the sixth resistor, the other end of the sixth resistor is connected to the negative terminal of the first Zener diode, ground, the anode of the first voltage regulator, the other end of the third capacitor, one end of the eighth resistor, and one end of the eighth capacitor; one end of the eighth resistor, the other end of the eighth capacitor, and the anode of the first Zener diode are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

6. The SiC MOS driving source circuit according to any one of claims 1-3, characterized in that, The first voltage regulator circuit includes a second Zener diode. The cathode of the second Zener diode is connected to the positive terminal of the output port of the first voltage source and serves as the positive terminal of the second port of the first voltage regulator circuit. The anode of the second Zener diode is connected to the negative terminal of the output port of the first voltage source and serves as the negative terminal of the second port of the first voltage regulator circuit.

7. The SiC MOS driving source circuit according to any one of claims 1-3, characterized in that, The first voltage regulator circuit includes an LDO chip. The input terminal of the LDO chip is connected to the positive terminal of the output port of the first voltage source. The output terminal of the LDO chip serves as the positive terminal of the second port of the first voltage regulator circuit. The ground terminal of the LDO chip is connected to the negative terminal of the output port of the first voltage source and serves as the negative terminal of the second port of the first voltage regulator circuit.

8. The SiC MOS driving source circuit according to any one of claims 1-3, characterized in that, The second voltage regulator circuit includes a sixth resistor and a first Zener diode; one end of the third capacitor and the cathode of the first Zener diode are connected to the positive terminal of the second port of the first voltage regulator circuit, and serve as the positive terminal of the second port of the second voltage regulator circuit; the other end of the third capacitor, the anode of the first Zener diode, one end of the eighth capacitor, and one end of the sixth resistor are grounded; the other end of the eighth capacitor and the other end of the sixth resistor are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

9. The SiC MOS driving source circuit according to any one of claims 1-3, characterized in that, The second voltage regulator circuit includes a sixth resistor and a first Zener diode; one end of the third capacitor and one end of the sixth resistor are connected to the positive terminal of the second port of the first voltage regulator circuit, and serve as the positive terminal of the second port of the second voltage regulator circuit; the other end of the third capacitor, the cathode of the first Zener diode, one end of the eighth capacitor, and the other end of the sixth resistor are grounded; the other end of the eighth capacitor and the anode of the first Zener diode are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

10. The SiC MOS driving source circuit according to any one of claims 1-3, characterized in that, The second voltage regulator circuit includes a first voltage regulator, a fourth resistor, a sixth resistor, and an eighth resistor; one end of the third capacitor and one end of the eighth resistor are connected to the positive terminal of the second port of the first voltage regulator circuit, and serve as the positive terminal of the second port of the second voltage regulator circuit; the other end of the third capacitor, the other end of the eighth resistor, one end of the fourth resistor, one end of the eighth capacitor, and the cathode ground wire of the first voltage regulator are connected; the other end of the fourth resistor and one end of the sixth resistor are connected to the reference terminal of the first voltage regulator; the anode of the first voltage regulator, the other end of the eighth capacitor, and the other end of the sixth resistor are connected to the negative terminal of the second port of the first voltage regulator circuit, and serve as the negative terminal of the second port of the second voltage regulator circuit.

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