Brushless DC Motor Control System Based on Three-Stage Filtered Power Supply

Abstract

This invention discloses a brushless DC motor control system based on a three-stage filtered power supply, comprising: a three-stage filtered power supply module, which includes a rectifier circuit unit, a counter-current power supply circuit unit, and a three-stage filtered circuit unit. The first terminal of the rectifier circuit unit is connected to the AC input power supply, the first terminal of the counter-current power supply circuit unit is connected to the second terminal of the rectifier circuit unit, and the first terminal of the three-stage filtered circuit unit is connected to the second terminal of the counter-current power supply circuit unit; an IGBT control module, whose first terminal is connected to the second terminal of the counter-current power supply circuit unit and whose second terminal is connected to the motor; and a CPU control module, whose first terminal is connected to the second terminal of the three-stage filtered circuit unit and whose second terminal is connected to the third terminal of the IGBT control module. This satisfies the low-noise and high-stability control requirements of the brushless DC motor.

Description

Technical Field

[0001] This invention relates to the field of brushless DC motor control technology, specifically to a brushless DC motor control system based on a three-stage filtered power supply. Background Technology

[0002] Brushless DC motors are widely used in power tools, home appliances, medical devices and robots due to their numerous advantages such as small size, light weight, high efficiency, good speed regulation performance, no commutation sparks and no excitation loss.

[0003] In related technologies, the controller power supply of brushless DC motor control systems is often subject to electromagnetic interference, which makes it impossible to meet the low noise and high stability control requirements of brushless DC motors. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this invention provides a brushless DC motor control system based on a three-stage filtered power supply. The three-stage filtered circuit can effectively prevent the generation of electromagnetic interference and meet the control requirements of low noise and high stability of brushless DC motors.

[0005] The technical solution adopted in this invention is as follows:

[0006] A brushless DC motor control system based on a three-stage filtered power supply includes: a three-stage filtered power supply module, comprising a rectifier circuit unit, a counter-current power supply circuit unit, and a three-stage filtered circuit unit. The first terminal of the rectifier circuit unit is connected to an AC input power supply, and the rectifier circuit unit converts the AC input power supply into a first DC current with a first voltage value. The first terminal of the counter-current power supply circuit unit is connected to a second terminal of the rectifier circuit unit, and the counter-current power supply circuit unit converts the first DC current into a second DC current with a second voltage value. The first terminal of the three-stage filtered circuit unit is connected to a second terminal of the counter-current power supply circuit unit, and the three-stage filtered circuit unit filters the second DC current and outputs a third DC current with a third voltage value. An IGBT control module is also included, with its first terminal connected to the second terminal of the counter-current power supply circuit unit and its second terminal connected to the motor. Finally, a CPU control module is included, with its first terminal connected to the second terminal of the three-stage filtered circuit unit and its second terminal connected to the third terminal of the IGBT control module.

[0007] In one embodiment of the present invention, the three-stage filtering power supply module further includes an EMC circuit unit, wherein a first terminal of the EMC circuit unit is connected to the AC input power supply, and a second terminal of the EMC circuit unit is connected to the first terminal of the rectifier circuit unit.

[0008] In one embodiment of the present invention, the counter-current power supply circuit unit further includes: a first chip of model VIPER22AS-EE and peripheral circuits corresponding to the first chip.

[0009] In one embodiment of the present invention, the three-stage filtering circuit unit includes: a first-stage filtering circuit, a second-stage filtering circuit, and a third-stage filtering circuit. One end of the first-stage filtering circuit is connected to the second end of the counter-current power supply circuit unit, one end of the second-stage filtering circuit is connected to the other end of the first-stage filtering circuit, one end of the third-stage filtering circuit is connected to the other end of the second-stage filtering circuit, and the other end of the third-stage filtering circuit is connected to the first end of the CPU control system.

[0010] In one embodiment of the present invention, the first-stage filter circuit includes: a second chip, a first pin of the second chip being connected to a second terminal of the backflash power supply circuit unit, and the second pin of the second chip being grounded; a first resistor, one end of the first resistor being connected to the backflash power supply circuit unit, and the other end of the first resistor being connected to a first pin of the second chip; a first electrolytic capacitor, one end of the first electrolytic capacitor being connected to a first pin of the second chip, and the other end of the first electrolytic capacitor being grounded; a second resistor, one end of the second resistor being connected to a first pin of the second chip, and the other end of the second resistor being connected to a third pin of the second chip; a first capacitor, one end of the first capacitor being connected to a fourth pin of the second chip; and a first capacitor... The system comprises: a first inductor, one end of which is connected to the fifth pin of the second chip; a third resistor, one end of which is connected to the sixth pin of the second chip, and the other end of which is connected to the other end of the first inductor; a second capacitor, one end of which is connected to the sixth pin of the second chip, and the other end of which is connected to the other end of the first inductor; a fourth resistor, one end of which is connected to the sixth pin of the second chip, and the other end of which is grounded; a second electrolytic capacitor, one end of which is connected to the other end of the first inductor, and the other end of which is grounded; and a third capacitor, one end of which is connected to the other end of the first inductor, and the other end of which is grounded.

[0011] In one embodiment of the present invention, the second-stage filter circuit includes: a fourth capacitor, one end of which is connected to one end of a third capacitor, and the other end of which is grounded; a third chip, the first and second pins of which are both connected to one end of the fourth capacitor, and the third pin of which is grounded; a fifth capacitor, one end of which is connected to the fourth pin of the third chip, and the other end of which is grounded; a sixth capacitor, one end of which is connected to the fourth pin of the third chip, and the other end of which is grounded; a seventh capacitor, one end of which is connected to the fourth pin of the third chip, and the other end of which is grounded; an eighth capacitor, one end of which is connected to the fourth pin of the third chip, and the other end of which is grounded; and a ninth capacitor, one end of which is connected to the fourth pin of the third chip, and the other end of which is grounded.

[0012] In one embodiment of the present invention, the third-stage filter circuit includes: a second inductor, one end of which is connected to the fourth pin of the third chip; a tenth capacitor, one end of which is connected to the other end of the second inductor; an eleventh capacitor, one end of which is connected to the other end of the second inductor; and a third inductor, one end of which is connected to the other ends of the tenth and eleventh capacitors respectively, and the other end of which is grounded.

[0013] In one embodiment of the present invention, the EMC circuit unit includes: a fuse, one end of which is connected to one end of the AC input power supply; a twelfth capacitor, one end of which is connected to the other end of the fuse, and the other end of which is connected to the other end of the AC input power supply; a fifth resistor, one end of which is connected to one end of the twelfth capacitor, and the other end of which is connected to the other end of the twelfth capacitor; a varistor, one end of which is connected to one end of the twelfth capacitor, and the other end of which is connected to the other end of the twelfth capacitor; a common-mode inductor, one pin of which is connected to one end of the varistor, and a second pin of which is connected to the other end of the varistor; and a thirteenth capacitor, one end of which is connected to the third pin of the common-mode inductor, and the other end of which is connected to the fourth pin of the common-mode inductor.

[0014] The beneficial effects of this invention are:

[0015] The invention employs a three-stage filtering circuit, which can effectively prevent the generation of electromagnetic interference and meet the control requirements of low noise and high stability of brushless DC motors. Attached Figure Description

[0016] Figure 1 This is a block diagram of a brushless DC motor control system based on a three-stage filtered power supply according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of a counter-current power supply circuit unit according to an embodiment of the present invention;

[0018] Figure 3 This is a block diagram of a brushless DC motor control system based on a three-stage filtered power supply according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the first-stage filter circuit according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the second-stage filter circuit according to an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the third-stage filter circuit according to an embodiment of the present invention;

[0022] Figure 7 This is a block diagram of a brushless DC motor control system based on a three-stage filtered power supply, according to another embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of an EMC circuit unit according to an embodiment of the present invention;

[0024] Figure 9 This is a schematic diagram of the structure of a rectifier circuit unit according to an embodiment of the present invention;

[0025] Figure 10 This is a schematic diagram of the structure of a phase control circuit in an IGBT control module according to an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Figure 1 This is a block diagram of a brushless DC motor control system based on a three-stage filtered power supply according to an embodiment of the present invention.

[0028] like Figure 1As shown, the brushless DC motor control system based on a three-stage filtered power supply in this embodiment of the invention may include: a three-stage filtered power supply module 100, an IGBT control module 200, and a CPU control module 300.

[0029] The three-stage filtering power supply module 100 includes a rectifier circuit unit 110, a counter-current power supply circuit unit 120, and a three-stage filtering circuit unit 130. The first terminal of the rectifier circuit unit 110 is connected to the AC input power supply, and the rectifier circuit unit 110 converts the AC input power supply into a first DC current with a first voltage value. The first terminal of the counter-current power supply circuit unit 120 is connected to the second terminal of the rectifier circuit unit 110, and the counter-current power supply circuit unit 120 converts the first DC current into a second DC current with a second voltage value. The first terminal of the three-stage filtering circuit unit 130 is connected to the second terminal of the counter-current power supply circuit unit 120, and the three-stage filtering circuit unit 130 filters the second DC current and outputs a third DC current with a third voltage value.

[0030] The first terminal of the IGBT control module 200 is connected to the second terminal of the counter-current power supply circuit unit 120, and the second terminal of the IGBT control module 200 is connected to the motor.

[0031] The first terminal of the CPU control system 300 is connected to the second terminal of the three-stage filter circuit unit 130, and the second terminal of the CPU control system 300 is connected to the third terminal of the IGBT control module 200.

[0032] Specifically, after the AC input power is rectified by the rectifier circuit unit 110, a first DC power with a first voltage value can be output. Then, the reverse-current power supply circuit unit 120 converts it into the required low-voltage DC output, while simultaneously achieving electrical isolation between the input and output circuits to ensure safety. That is, the first DC power is converted into a second DC power with a second voltage value, and the second DC power is used to power the IGBT control module. The first voltage value is greater than the second voltage value. The first and second voltage values ​​can be calibrated according to actual conditions; for example, the first voltage value is 220V and the second voltage value is 17V.

[0033] The second DC power supply is filtered by a three-stage filter circuit unit 130, resulting in a third DC power supply with a third voltage value. This third DC power supply powers the CPU control module 300. Thus, through the progressive filtering by the three stages, the final output voltage signal achieves microvolt-level ripple, meeting the low noise and high stability requirements of brushless DC motors. The second voltage value is lower than the third voltage value, which can be calibrated according to actual conditions; for example, the third voltage value can be 4V.

[0034] In one embodiment of the present invention, such as Figure 2 As shown, the counter-current power supply circuit unit 120 includes a first chip U1 of model VIPER22AS-EE and corresponding peripheral circuitry. The peripheral circuitry consists of components such as resistors, diodes, capacitors, and inductors.

[0035] In one embodiment of the present invention, such as Figure 3 As shown, the three-stage filter circuit unit 130 includes: a first-stage filter circuit 131, a second-stage filter circuit 132, and a third-stage filter circuit 133. One end of the first-stage filter circuit 131 is connected to the second end of the counter-current power supply circuit unit 120, one end of the second-stage filter circuit 132 is connected to the other end of the first-stage filter circuit 131, one end of the third-stage filter circuit 133 is connected to the other end of the second-stage filter circuit 132, and the other end of the third-stage filter circuit 133 is connected to the first end of the CPU control system 300.

[0036] In one embodiment of the present invention, such as Figure 4 As shown, the first-stage filter circuit 131 includes: a second chip U2, a first resistor R1, a first electrolytic capacitor CD1, a second resistor R2, a first capacitor C1, a first inductor L1, a third resistor R3, a second capacitor C2, a fourth resistor R4, a second electrolytic capacitor CD2, and a third capacitor C3.

[0037] Specifically, the first pin a1 of the second chip U2 is connected to the second terminal D_VDD of the backflash power supply circuit unit 120, and the second pin a2 of the second chip U2 is grounded; one end of the first resistor R1 is connected to the backflash power supply circuit unit 120, and the other end of the first resistor R1 is connected to the first pin a1 of the second chip U2; one end of the first electrolytic capacitor CD1 is connected to the first pin a1 of the second chip U2, and the other end of the first electrolytic capacitor CD1 is grounded; one end of the second resistor R2 is connected to the first pin a1 of the second chip U2, and the other end of the second resistor R2 is connected to the third pin a3 of the second chip U2; one end of the first capacitor C1 is connected to the fourth pin a4 of the second chip U2; and the first inductor L... One end of capacitor C1 is connected to the fifth pin a5 of the second chip U2; one end of the third resistor R3 is connected to the sixth pin a6 of the second chip U2, and the other end of the third resistor R3 is connected to the other end of the first inductor L1; one end of the second capacitor C2 is connected to the sixth pin a6 of the second chip U2, and the other end of the second capacitor C2 is connected to the other end of the first inductor L1; one end of the fourth resistor R4 is connected to the sixth pin a6 of the second chip U2, and the other end of the fourth resistor R4 is grounded; one end of the second electrolytic capacitor CD2 is connected to the other end of the first inductor L1, and the other end of the second electrolytic capacitor CD2 is grounded; one end of the third capacitor C3 is connected to the other end of the first inductor L1, and the other end of the third capacitor C3 is grounded.

[0038] The second chip U2 can be model number SY8301.

[0039] In one embodiment of the present invention, such as Figure 5 As shown, the second-stage filter circuit 132 includes: a fourth capacitor C4, a third chip U3, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, and a ninth capacitor C9.

[0040] Among them, one end of the fourth capacitor C4 is connected to one end of the third capacitor C3, and the other end of the fourth capacitor C4 is grounded; the first pin b1 and the second pin b2 of the third chip U3 are both connected to one end of the fourth capacitor C4, and the third pin b3 of the third chip U3 is grounded; one end of the fifth capacitor C5 is connected to the fourth pin b4 of the third chip U3, and the other end of the fifth capacitor C5 is grounded; one end of the sixth capacitor C6 is connected to the fourth pin b4 of the third chip U3, and the other end of the sixth capacitor C6 is grounded; one end of the seventh capacitor C7 is connected to the fourth pin b4 of the third chip U3, and the other end of the seventh capacitor C7 is grounded; one end of the eighth capacitor C8 is connected to the fourth pin b4 of the third chip U3, and the other end of the eighth capacitor C8 is grounded; one end of the ninth capacitor C9 is connected to the fourth pin b4 of the third chip U3, and the other end of the ninth capacitor C9 is grounded.

[0041] Among them, pin b5 of the third chip U3 is an NC pin (i.e., an unused pin, which does not need to be connected or used in the circuit). The model of the third chip U3 can be RP114N331D-FF.

[0042] In one embodiment of the present invention, such as Figure 6 As shown, the third-stage filter circuit 133 includes: a second inductor L2, a tenth capacitor C10, an eleventh capacitor C11, and a third inductor L3.

[0043] Among them, one end of the second inductor L2 is connected to the fourth pin b4 of the third chip U3; one end of the tenth capacitor C10 is connected to the other end of the second inductor L2; one end of the eleventh capacitor C11 is connected to the other end of the second inductor L2; one end of the third inductor L3 is connected to the other ends of the tenth capacitor C10 and the eleventh capacitor C11 respectively, and the other end of the third inductor L3 is grounded.

[0044] Therefore, through the three-stage filtering process of the first-stage filter circuit 131, the second-stage filter circuit 132, and the third-stage filter circuit 133, the final output voltage signal can reach the microvolt level of ripple, which meets the requirements of brushless DC motors for low noise and high stability.

[0045] In one embodiment of the present invention, such as Figure 7As shown, the three-stage filter power supply module 100 also includes an EMC circuit unit 140, the first end of which is connected to the AC input power supply, and the second end of which is connected to the first end of the rectifier circuit unit 110.

[0046] Specifically, by using a front-end EMC circuit, the system can operate stably in complex electromagnetic environments while reducing the risk of interference to surrounding equipment. This improves the system's electromagnetic compatibility and ensures functional stability.

[0047] In one embodiment of the present invention, such as Figure 8 As shown, the EMC circuit unit 140 includes: a fuse F1, a twelfth capacitor C12, a fifth resistor R5, a varistor RV1, a common-mode inductor LC1, and a thirteenth capacitor C13.

[0048] Specifically, one end of fuse F1 is connected to one end of AC input power supply TP1; one end of twelfth capacitor C12 is connected to the other end of fuse F1, and the other end of twelfth capacitor C12 is connected to the other end of AC input power supply TP2; one end of fifth resistor R5 is connected to one end of twelfth capacitor C12, and the other end of fifth resistor R5 is connected to the other end of twelfth capacitor C12; one end of varistor RV1 is connected to one end of twelfth capacitor C12, and the other end of varistor RV1 is connected to the other end of twelfth capacitor C12; the first pin of common mode inductor LC1 is connected to one end of varistor RV1, and the second pin of common mode inductor LC1 is connected to the other end of varistor RV1; one end of thirteenth capacitor C13 is connected to the third pin of common mode inductor LC1, and the other end of thirteenth capacitor C13 is connected to the fourth pin of common mode inductor LC1.

[0049] The two ends of the thirteenth capacitor C13 are connected to the rectifier circuit unit 110.

[0050] In one embodiment of the present invention, such as Figure 9 As shown, the rectifier circuit unit 110 includes a rectifier bridge and corresponding peripheral circuits, wherein the peripheral circuits are composed of devices such as resistors, capacitors, diodes and varistors.

[0051] In one embodiment of the present invention, such as Figure 10 As shown, the IGBT control module 200 includes a three-phase control circuit for a brushless DC motor. Each phase control circuit includes a fourth chip U4 and corresponding peripheral circuits. These peripheral circuits consist of resistors, capacitors, diodes, and IGBTs (Insulated Gate Bipolar Transistors). Figure 10Only one phase control circuit is shown; the other two phase control circuits are similar. The fourth chip, U4, could be an IR25S606.

[0052] In summary, the brushless DC motor control system based on a three-stage filtered power supply according to an embodiment of the present invention includes: a three-stage filtered power supply module, an IGBT control module, and a CPU control module. The three-stage filtered power supply module includes a rectifier circuit unit, a counter-current power supply circuit unit, and a three-stage filtered circuit unit. The first terminal of the rectifier circuit unit is connected to the AC input power supply, and the rectifier circuit unit is used to convert the AC input power supply into a first DC current with a first voltage value. The first terminal of the counter-current power supply circuit unit is connected to the second terminal of the rectifier circuit unit, and the counter-current power supply circuit unit is used to convert the first DC current into a second DC current with a second voltage value. The first terminal of the three-stage filtered circuit unit is connected to the second terminal of the counter-current power supply circuit unit, and the three-stage filtered circuit unit is used to filter the second DC current and output a third DC current with a third voltage value. The first terminal of the IGBT control module is connected to the second terminal of the counter-current power supply circuit unit, and the second terminal of the IGBT control module is connected to the motor. The first terminal of the CPU control system is connected to the second terminal of the three-stage filtered circuit unit, and the second terminal of the CPU control system is connected to the third terminal of the IGBT control module. Therefore, the use of a three-stage filter circuit can effectively prevent the generation of electromagnetic interference and meet the low noise and high stability control requirements of brushless DC motors.

[0053] In the description of this invention, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0054] 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] 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.

[0056] In the description of this specification, the 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 present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0058] 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 brushless DC motor control system based on a three-stage filter power supply, characterized by, include: A three-stage filtering power supply module includes a rectifier circuit unit, a counter-current power supply circuit unit, and a three-stage filtering circuit unit. The first terminal of the rectifier circuit unit is connected to an AC input power supply, and the rectifier circuit unit converts the AC input power supply into a first DC current with a first voltage value. The first terminal of the counter-current power supply circuit unit is connected to the second terminal of the rectifier circuit unit, and the counter-current power supply circuit unit converts the first DC current into a second DC current with a second voltage value. The first terminal of the three-stage filtering circuit unit is connected to the second terminal of the counter-current power supply circuit unit, and the three-stage filtering circuit unit filters the second DC current and outputs a third DC current with a third voltage value. The three-stage filtering circuit unit includes a first-stage filtering circuit, a second-stage filtering circuit, and a third-stage filtering circuit. One terminal of the first-stage filtering circuit is connected to the second terminal of the counter-current power supply circuit unit, one terminal of the second-stage filtering circuit is connected to the other terminal of the first-stage filtering circuit, one terminal of the third-stage filtering circuit is connected to the other terminal of the second-stage filtering circuit, and the other terminal of the third-stage filtering circuit is connected to the first terminal of the CPU control system. The first-stage filtering circuit includes: The second chip has its first pin connected to the second terminal of the counter-current power supply circuit unit, and its second pin is grounded. A first resistor, one end of which is connected to the counter-current power supply circuit unit, and the other end of which is connected to the first pin of the second chip. The first electrolytic capacitor has one end connected to the first pin of the second chip, and the other end grounded. The second resistor has one end connected to the first pin of the second chip and the other end connected to the third pin of the second chip. The first capacitor, one end of which is connected to the fourth pin of the second chip; The first inductor, one end of which is connected to the fifth pin of the second chip; The third resistor has one end connected to the sixth pin of the second chip and the other end connected to the other end of the first inductor. The second capacitor has one end connected to the sixth pin of the second chip, and the other end connected to the other end of the first inductor. The fourth resistor has one end connected to the sixth pin of the second chip and the other end grounded. The second electrolytic capacitor has one end connected to the other end of the first inductor, and the other end of the second electrolytic capacitor is grounded. A third capacitor, one end of which is connected to the other end of the first inductor, and the other end of which is grounded; The second-stage filter circuit includes: A fourth capacitor, one end of which is connected to one end of the third capacitor, and the other end of the fourth capacitor is grounded; The third chip, wherein the first and second pins of the third chip are both connected to one end of the fourth capacitor, and the third pin of the third chip is grounded; The fifth capacitor has one end connected to the fourth pin of the third chip, and the other end grounded. The sixth capacitor has one end connected to the fourth pin of the third chip and the other end grounded. The seventh capacitor has one end connected to the fourth pin of the third chip and the other end grounded. The eighth capacitor has one end connected to the fourth pin of the third chip and the other end grounded. The ninth capacitor has one end connected to the fourth pin of the third chip and the other end grounded. The third-stage filter circuit includes: The second inductor, one end of which is connected to the fourth pin of the third chip; The tenth capacitor, one end of which is connected to the other end of the second inductor; The eleventh capacitor, one end of which is connected to the other end of the second inductor; The third inductor has one end connected to the other end of the tenth capacitor and the other end of the eleventh capacitor, and the other end of the third inductor is grounded. The IGBT control module has its first terminal connected to the second terminal of the counter-current power supply circuit unit, and its second terminal connected to the motor. The CPU control module has its first terminal connected to the second terminal of the three-stage filter circuit unit, and its second terminal connected to the third terminal of the IGBT control module.

2. The brushless DC motor control system based on a three-stage filtered power supply according to claim 1, characterized in that, The three-stage filtering power supply module also includes: The EMC circuit unit has its first terminal connected to the AC input power supply and its second terminal connected to the first terminal of the rectifier circuit unit.

3. The brushless DC motor control system based on a three-stage filtered power supply according to claim 1, characterized in that, The counter-current power supply circuit unit includes: The first chip with model number VIPER22AS-EE and the corresponding peripheral circuit of the first chip.

4. The brushless DC motor control system based on a three-stage filtered power supply according to claim 2, characterized in that, The EMC circuit unit includes: A fuse, one end of which is connected to one end of the AC input power supply; The twelfth capacitor has one end connected to the other end of the fuse and the other end connected to the other end of the AC input power supply. The fifth resistor has one end connected to one end of the twelfth capacitor, and the other end of the fifth resistor is connected to the other end of the twelfth capacitor. A varistor, one end of which is connected to one end of the twelfth capacitor, and the other end of which is connected to the other end of the twelfth capacitor; A common-mode inductor, wherein the first pin of the common-mode inductor is connected to one end of the varistor, and the second pin of the common-mode inductor is connected to the other end of the varistor; The thirteenth capacitor has one end connected to the third pin of the common-mode inductor and the other end connected to the fourth pin of the common-mode inductor.

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