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CN-122001238-A - Capacitor module, driving motor controller and electric driving system

CN122001238ACN 122001238 ACN122001238 ACN 122001238ACN-122001238-A

Abstract

The embodiment of the application provides a capacitor module, a driving motor controller and an electric driving system, which comprise a third capacitor connected in parallel with a first capacitor and a second capacitor, wherein the capacitance value of the third capacitor is larger than the equivalent capacitance of the first capacitor and the second capacitor, when the power module works in a two-level mode, the third capacitor is used as a supporting capacitor, and works in a three-level mode, and the first capacitor and the second capacitor are used as supporting capacitors. The third capacitor is connected in parallel with the first capacitor and the second capacitor, and the capacitance sum of the first capacitor, the second capacitor and the third capacitor can be smaller than that of the first capacitor and the second capacitor only under the condition that the first capacitor and the second capacitor exist under the condition of constant electric drive power, so that the capacitance sum of the first capacitor and the second capacitor is reduced. Since the third capacitor can be used as a filter capacitor, the ripple voltage of the direct current bus can be controlled, and therefore the capacitance and the volume of the first capacitor and the second capacitor can be further reduced.

Inventors

  • QIN XIUJING
  • LIU CHANG
  • LI HUANPING
  • ZHANG HONG

Assignees

  • 苏州汇川联合动力系统股份有限公司

Dates

Publication Date
20260508
Application Date
20250620

Claims (20)

  1. 1. A capacitive module, comprising: The first output end (P1), the second output end (M1) and the third output end (N1) are respectively used for connecting the first input end (P2), the second input end (M2) and the third input end (N2) of the power module (20); And a first capacitance (C1) connected between the first output terminal (P1) and the second output terminal (M1), a second capacitance (C2) connected between the second output terminal (M1) and the third output terminal (N1), and a third capacitance (C3) connected between the first output terminal (P1) and the third output terminal (N1), the capacitance value of the third capacitance (C3) being larger than the equivalent capacitance values of the first capacitance (C1) and the second capacitance (C2); The power module (20) is in a three-level mode, the first capacitor (C1) and the second capacitor (C2) are used as supporting capacitors, the third capacitor (C3) is used as a filtering capacitor, and the third capacitor (C3) is used as a supporting capacitor when the power module (20) is in a two-level mode.
  2. 2. The capacitive module (10) according to claim 1, characterized in that the first capacitance (C1) and the second capacitance (C2) are located between the third capacitance (C3) and the power module (20); when the power module (20) operates in a two-level mode, the first capacitor (C1) and the second capacitor (C2) act as decoupling capacitors.
  3. 3. The capacitive module (10) according to claim 1 or 2, characterized in that the capacitive module (10) further comprises a plurality of first connections; The first connectors comprise connectors with two ends respectively connected with the first output end (P1) and the first capacitor (C1), connectors with two ends respectively connected with the first output end (P1) and the third capacitor (C3), connectors with two ends respectively connected with the second output end (M1) and the first capacitor (C1), connectors with two ends respectively connected with the second output end (M1) and the second capacitor (C2), connectors with two ends respectively connected with the third output end (N1) and the second capacitor (C2), and connectors with two ends respectively connected with the third output end (N1) and the third capacitor (C3).
  4. 4. A capacitive module (10) according to claim 3, characterized in that at least two of the first connectors are arranged in a stack of partial areas.
  5. 5. The capacitive module (10) of claim 1, wherein the first capacitance (C1), the second capacitance (C2), and the third capacitance (C3) comprise at least one of an electrolytic capacitance, a thin film capacitance, and a ceramic capacitance.
  6. 6. The capacitive module (10) of claim 1, wherein the capacitive module (10) further comprises: The first input end is connected with a first output end (P1) of the capacitor module (10); the second input end is connected with a second output end (M1) of the capacitor module (10); The first input end and the second input end of the capacitor module (10) are respectively used for connecting two ends of a battery.
  7. 7. A drive motor controller (100) comprising a capacitive module (10) according to any one of claims 1-6 and a power module (20); The first output end of the capacitor module (10) is connected with the first input end (P2) of the power module (20), the second output end (M1) of the capacitor module (10) is connected with the second input end (M2) of the power module (20), and the third output end (N1) of the capacitor module (10) is connected with the third input end (N2) of the power module (20).
  8. 8. The drive motor controller (100) according to claim 7, wherein the drive motor controller (100) further comprises a low parasitic capacitance module (30); The low-parasitic capacitance module (30) is connected with the capacitance module (10) and the power module (20), and the equivalent capacitance value of the low-parasitic capacitance module (30) is smaller than that of a first capacitor (C1) and a second capacitor (C2) of the capacitance module (10).
  9. 9. The drive motor controller (100) of claim 8, wherein the low parasitic capacitance module (30) includes a first end (P3), a second end (M3), and a third end (N3); The low-noise capacitor module (30) comprises a first end (P3) for connecting a first output end (P1) of the capacitor module (10) and a first input end (P2) of the power module (20), a second end (M3) for connecting a second output end (M1) of the capacitor module (10) and a second input end (M2) of the power module (20), and a third end (N3) for connecting a third output end (N1) of the capacitor module (10) and a third input end (N2) of the power module (20).
  10. 10. The drive motor controller (100) of claim 9, wherein the low parasitic capacitance module (30) comprises: A fourth capacitor (C4) connected between the first end (P3) and the second end (M3) of the low parasitic capacitance module (30); And a fifth capacitor (C5) connected between the second end (M3) and the third end (N3) of the low parasitic capacitance module (30).
  11. 11. The drive motor controller (100) according to claim 10, wherein an equivalent capacitance value of the fourth capacitance (C4) and the fifth capacitance (C5) is smaller than an equivalent capacitance value of the first capacitance (C1) and the second capacitance (C2).
  12. 12. The drive motor controller (100) according to claim 10, wherein the fourth capacitance (C4) and the fifth capacitance (C5) comprise at least one of an electrolytic capacitance, a film capacitance, and a ceramic capacitance.
  13. 13. The drive motor controller (100) according to claim 8, wherein the low parasitic capacitance module (30) is independently disposed between the capacitance module (10) and the power module (20).
  14. 14. The drive motor controller (100) according to claim 8, wherein the low parasitic capacitance module (30) is integrally provided to the power module (20).
  15. 15. The drive motor controller (100) according to claim 8, further comprising: A plurality of second connectors; The plurality of second connecting pieces comprise connecting pieces, two ends of each connecting piece are respectively connected with a first output end (P1) of the capacitor module (10) and a first input end (P2) of the power module (20), two ends of each connecting piece are respectively connected with a second output end (M1) of the capacitor module (10) and a second input end (M2) of the power module (20), and two ends of each connecting piece are respectively connected with a third output end (N1) of the capacitor module (10) and a third input end (N2) of the power module (20).
  16. 16. The drive motor controller (100) according to claim 15, wherein a partial region of at least two of the plurality of second connection members is arranged in a stack.
  17. 17. The drive motor controller (100) according to claim 15, further comprising: a plurality of third connectors; The plurality of third connecting pieces comprise connecting pieces, two ends of each connecting piece are respectively connected with a first end (P3) of the low-noise-capacitance module (30) and a first input end (P2) of the power module (20), two ends of each connecting piece are respectively connected with a second end (M3) of the low-noise-capacitance module (30) and a second input end (M2) of the power module (20), and two ends of each connecting piece are respectively connected with a third end (N3) of the low-noise-capacitance module (30) and a third input end (N2) of the power module (20).
  18. 18. The drive motor controller (100) according to claim 17, wherein a partial region of at least two of the plurality of third connection members is stacked.
  19. 19. The drive motor controller (100) according to claim 17, wherein a length of a connection of the first end (P3) of the low parasitic capacitance module (30) and the first input end (P2) of the power module (20) is smaller than a length of a connection of the first output end (P1) of the capacitance module (10) and the first input end (P2) of the power module (20); The length of the connection piece of the second end (M3) of the low-noise capacitance module (30) and the second input end (M2) of the power module (20) is smaller than the length of the connection piece of the second output end (M1) of the capacitance module (10) and the second input end (M2) of the power module (20); the length of the connecting piece of the third end (N3) of the low-noise capacitance module (30) and the third input end (N2) of the power module (20) is smaller than the length of the connecting piece of the third output end (N1) of the capacitance module (10) and the third input end (N2) of the power module (20).
  20. 20. The drive motor controller (100) according to claim 8, wherein the power module (20) comprises three drive arms (201); the first end of each driving arm (201) is connected with the first input end (P2) of the power module (20), the second end of each driving arm (201) is connected with the second input end (M2) of the power module (20), the third end of each driving arm (201) is connected with the third input end (N2) of the power module (20), and the fourth end of each driving arm (201) serves as the output end of the power module (20).

Description

Capacitor module, driving motor controller and electric driving system Technical Field The application relates to the field of electric driving, in particular to a capacitor module, a driving motor controller and an electric driving system. Background The three-level power topology is applied to a new energy automobile electric drive system and can be used for improving the working efficiency of the electric drive system. Considering that the cost of the three-level power topology is far higher than that of the two-level power topology, the cost of the three-level power topology is reduced by depending on a two-level and three-level software switching strategy under the three-level power topology. However, under the three-level power topology, if the operation under the highest power of the driving motor controller is still required to be maintained under the three-level mode, the series connection of two direct current bus capacitors is usually considered, and the capacitance value of the direct current bus capacitor under the scheme is required to be changed into twice the capacitance value of the direct current bus capacitor under the original two-level power topology, so that the volume and the cost are greatly increased. Disclosure of Invention The embodiment of the application provides a capacitor module, a driving motor controller and an electric driving system, which are used for reducing the volume and cost of a capacitor. In a first aspect, an embodiment of the present application provides a capacitive module, including: the first output end, the second output end and the third output end are respectively used for connecting the first input end, the second input end and the third input end of the power module; The first capacitor is connected between the first output end and the second output end, the second capacitor is connected between the second output end and the third output end, and the third capacitor is connected between the first output end and the third output end, wherein the capacitance value of the third capacitor is larger than the equivalent capacitance value of the first capacitor and the second capacitor; the first capacitor and the second capacitor are used as supporting capacitors when the power module works in a three-level mode, the third capacitor is used as a filtering capacitor, and the third capacitor is used as a supporting capacitor when the power module works in a two-level mode. In one possible implementation, the first capacitor and the second capacitor are located between the third capacitor and the power module; When the power module works in a two-level mode, the first capacitor and the second capacitor serve as decoupling capacitors. In one possible embodiment, the capacitive module further comprises a plurality of first connectors; The first connectors comprise connectors with two ends respectively connected with the first output end and the first capacitor, two ends respectively connected with the first output end and the third capacitor, two ends respectively connected with the second output end and the first capacitor, two ends respectively connected with the second output end and the second capacitor, two ends respectively connected with the third output end and the second capacitor, and two ends respectively connected with the third output end and the third capacitor. In one possible embodiment, the plurality of first connectors are arranged in a stack of partial areas of at least two first connectors. In one possible embodiment, the first, second and third capacitances include at least one of an electrolytic capacitance, a thin film capacitance and a ceramic capacitance. In one possible embodiment, the capacitive module further comprises: the first input end is connected with the first output end of the capacitor module; the second input end is connected with the second output end of the capacitor module; the first input end and the second input end of the capacitor module are respectively used for connecting two ends of the battery. In a second aspect, the present application provides a driving motor controller, including the capacitor module and the power module of the first aspect; the first output end of the capacitor module is connected with the first input end of the power module, the second output end of the capacitor module is connected with the second input end of the power module, and the third output end of the capacitor module is connected with the third input end of the power module. In one possible embodiment, the driving motor controller further comprises a low parasitic capacitance module; The low-parasitic capacitance module is connected with the capacitance module and the power module, and the equivalent capacitance value of the low-parasitic capacitance module is smaller than that of the first capacitance and the second capacitance of the capacitance module. In one possible embodiment, the low parasitic capacitance module includes a firs