Smoothing capacitors, power conversion circuits

Abstract

This invention provides a smoothing capacitor and power conversion circuit with suppressed increases in size. [Solution] The first smoothing capacitor 300 has an 11th capacitance section 310 and a 12th capacitance section 320 spaced apart in the Y direction, an 11th capacitor busbar 330 and a 12th capacitor busbar 340 connecting them in parallel, and a first capacitor housing 350 that houses them. The 11th capacitance section and the 12th capacitance section are equipped with an 11th electrode 301 and a 12th electrode 302 spaced apart in the X direction. The 11th capacitor busbar and the 12th capacitor busbar are equipped with an 11th power supply connection section 331 and a 12th power supply connection section 341 that are connected to a battery. The connection points between the 11th power supply connection section and the 12th power supply connection section and the battery are outside the capacitor housing and are located between the 11th capacitance section 310 and the 12th capacitance section 320. The entire projection area of ​​the 11th power supply connection section and the 12th power supply connection section in the Y direction is within the capacitor housing.

Claims

1. A smoothing capacitor included in the power conversion circuit (130, 230), It comprises first electrodes (301, 501) and second electrodes (302, 502) spaced apart in the lateral direction, and first capacitance sections (310, 510) and second capacitance sections (320, 520) arranged in a vertical direction perpendicular to the lateral direction, Capacitor busbars (330, 340, 530, 540) connecting the first capacitance section and the second capacitance section in parallel, The capacitor has the first capacitance section, the second capacitance section, and a capacitor housing (350, 550) that houses the capacitor busbar, The capacitor busbar comprises a first capacitor busbar (330, 530) connected to the first electrode of the first capacitance section and the second capacitance section, and a second capacitor busbar (340, 540) connected to the second electrode of the first capacitance section and the second capacitance section. The first capacitor busbar and the second capacitor busbar are equipped with power connection sections (331, 341, 531, 541) that are connected to a power supply (20) that supplies power to the power conversion circuit. The power supply connection section is located outside the capacitor housing. The connection point with the power supply in the power supply connection section is located between the first capacitance section and the second capacitance section in the vertical direction. A smoothing capacitor in which the entire vertical projection area of ​​the connection point with the power supply in the power supply connection section is located within the capacitor housing.

2. The first capacitor busbar includes a first connection portion (332, 532) connected to the first electrode of the first capacitance portion and the second capacitance portion, The second capacitor busbar includes a second connection portion (342, 542) connected to the first capacitance portion and the second electrode of the second capacitance portion, The smoothing capacitor according to claim 1, wherein the lateral length of the power supply connection portion between the lateral position of the first connection portion and the lateral position of the second connection portion is less than or equal to the lateral separation distance between the first connection portion and the second connection portion.

3. A power conversion circuit having horizontally arranged switch circuits (400, 600) and smoothing capacitors (300, 500), which supplies driving power to power equipment (41, 42), The smoothing capacitor is The device comprises first electrodes (301, 501) and second electrodes (302, 502) spaced apart in the lateral direction, and first capacitance sections (310, 510) and second capacitance sections (320, 520) arranged in a vertical direction perpendicular to the lateral direction, Capacitor busbars (330, 340, 530, 540) connecting the first capacitance section and the second capacitance section in parallel, The capacitor has the first capacitance section, the second capacitance section, and a capacitor housing (350, 550) that houses the capacitor busbar, The capacitor busbar comprises a first capacitor busbar (330, 530) connected to the first electrode of the first capacitance section and the second capacitance section, and a second capacitor busbar (340, 540) connected to the second electrode of the first capacitance section and the second capacitance section. The first capacitor busbar and the second capacitor busbar are equipped with power connection sections (331, 341, 531, 541) that are connected to a power supply (20), The power supply connection section is located outside the capacitor housing. The connection point with the power supply in the power supply connection section is located between the first capacitance section and the second capacitance section in the vertical direction. A power conversion circuit in which the entire vertical projection area of ​​the connection point with the power supply in the power supply connection section is located within the capacitor housing.

4. The first capacitor busbar includes a first connection portion (332, 532) connected to the first electrode of the first capacitance portion and the second capacitance portion, The second capacitor busbar includes a second connection portion (342, 542) connected to the first capacitance portion and the second electrode of the second capacitance portion, The power conversion circuit according to claim 3, wherein the lateral length of the power supply connection portion between the lateral position of the first connection portion and the lateral position of the second connection portion is less than or equal to the lateral separation distance between the first connection portion and the second connection portion.

5. The power equipment has a first stator coil (43, 46), a second stator coil (44, 47), and a third stator coil (45, 48). The switch circuit has a first power conversion unit (410, 610) and a second power conversion unit (420, 620), The first power conversion unit has a first U-phase leg (411, 611), a first V-phase leg (412, 612), and a first W-phase leg (413, 613), The second power conversion unit has a second U-phase leg (421, 621), a second V-phase leg (422, 622), and a second W-phase leg (423, 623), In the aforementioned vertical direction, the first U-phase leg, the first V-phase leg, the first W-phase leg, the second U-phase leg, the second V-phase leg, and the second W-phase leg are arranged in order. The first U-phase leg and the second U-phase leg are connected to the first stator coil. The first V-phase leg and the second V-phase leg are connected to the second stator coil. The power conversion circuit according to claim 3 or claim 4, wherein the first W-phase leg and the second W-phase leg are connected to the third stator coil.

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