WO-2026094643-A1 - CAPACITOR MODULE AND POWER CONVERSION DEVICE

WO2026094643A1WO 2026094643 A1WO2026094643 A1WO 2026094643A1WO-2026094643-A1

Abstract

A Y capacitor (40) includes capacitors (41, 42) connected in parallel between a power source conductor (20) and a base conductor (30). The capacitor (41) is mounted spaced apart from a location of connection with the power source conductor (20) on a coupling conductor (51), and constitutes a path (R1) along with the coupling conductor (51). The capacitor (42) is mounted spaced apart from a location of connection with the power source conductor (20) on a coupling conductor (52), and constitutes a path (R2) along with the coupling conductor (52). The paths (R1, R2) are cross-connected between the power source conductor (20) and the base conductor (30). The power source conductor (20) has connection sections (P1, N1) for connection with the path (R1), and connection sections (P2, N2) for connection with the path (R2) that is provided to a location close to an inverter (5). The base conductor (30) comprises a connecting section (B1) for connection with the path (R2), and a connecting section (B2) for connection with the path (R2) that is provided to a location spaced apart from the connection section (B1) so that there is an impedance between the connection section (B1) and the connecting section (B2).

Inventors

MATSUOKA, TETSUYA
HIRUMA, ATSUYUKI

Assignees

株式会社デンソー

Dates

Publication Date: 20260507
Application Date: 20251016
Priority Date: 20241104

Claims (12)

A capacitor module connected to a power converter (5) including a switching element, A positive electrode conductor (20P) connected to the DC positive terminal of the power converter, The negative electrode conductor (20N) connected to the DC negative terminal of the power converter, A base conductor (30) connected to a grounding member that provides a reference potential, A Y capacitor (40) is connected in series between the positive conductor and the negative conductor, and includes a first capacitor (41) and a second capacitor (42) connected in parallel between the power supply conductor (20), which is at least one of the positive conductor and the negative conductor, and the base conductor, The first connecting conductor (51) is electrically connected to the power supply conductor, and the first capacitor is mounted at a position away from the connection point with the power supply conductor, and together with the first capacitor, constitutes a first path (R1), A second connecting conductor (52) is electrically connected to the power supply conductor, and the second capacitor is mounted at a position away from the connection point with the power supply conductor, and together with the second capacitor, the second connecting conductor (52) constitutes a second path (R2), Equipped with, The first path and the second path are connected in a cross-over configuration between the power conductor and the base conductor. The power conductor has a first power connection section (P1, N1) to which the first path is connected, and a second power connection section (P2, N2) located closer to the power converter than the first power connection section and to which the second path is connected. The capacitor module comprises a base conductor having a first base connection (B1) to which the second path is connected, and a second base connection (B2) to which the first path is connected at a position away from the first base connection, such that an impedance exists between the first base connection and the second base connection.
At least one of the base connection portions is connected to a grounding portion (B3) which is a connection portion of the base conductor with the grounding member, The capacitor module according to claim 1, wherein the impedance between the grounding portion and the base connection portion connected to the grounding portion is smaller than the impedances of the first path and the second path, respectively.
One of the base connection parts is connected to the grounding part, The capacitor module according to claim 2, wherein the other base connection portion is located further away from the ground portion than the base connection portion connected to the ground portion.
The capacitor module according to claim 2 or 3, wherein the portion of the base conductor between the first base connection portion and the second base connection portion is not in contact with the grounding member.
The capacitor module according to claim 4, wherein the portion between the first base connection portion and the second base connection portion is arranged on the grounding member via a low-conductivity member (61) having lower conductivity than the base conductor.
The capacitor module according to claim 2 or 3, wherein an inductor component (33) is mounted between the first base connection portion and the second base connection portion in the base conductor.
The power conductor extends in a predetermined direction, The capacitor module according to claim 1, wherein the base conductor is located between the first connecting conductor and the second connecting conductor in the predetermined direction.
The capacitor module according to claim 7, wherein the first connecting conductor and the second connecting conductor extend from the power supply conductor in a direction different from the predetermined direction.
The capacitor module according to claim 8, wherein the first connecting conductor and the second connecting conductor extend toward the same side relative to the power supply conductor.
The capacitor module according to claim 8 or 9, wherein the connection portion of the base conductor to the grounding member is located closer to the power supply conductor than the first base connection portion and the second base connection portion.
The capacitor module according to claim 7, wherein the base conductor includes a portion extending in the predetermined direction.
A power converter (5) including a switching element, A capacitor module (6) connected to the power converter, A power conversion device comprising, The aforementioned capacitor module is A positive electrode conductor (20P) connected to the DC positive terminal of the power converter, The negative electrode conductor (20N) connected to the DC negative terminal of the power converter, A base conductor (30) connected to a grounding member that provides a reference potential, A Y capacitor (40) is connected in series between the positive conductor and the negative conductor, and includes a first capacitor (41) and a second capacitor (42) connected in parallel between the power supply conductor (20), which is at least one of the positive conductor and the negative conductor, and the base conductor, The first connecting conductor (51) is electrically connected to the power supply conductor, and the first capacitor is mounted at a position away from the connection point with the power supply conductor, and together with the first capacitor, constitutes a first path (R1), A second connecting conductor (52) is electrically connected to the power supply conductor, and the second capacitor is mounted at a position away from the connection point with the power supply conductor, and together with the second capacitor, the second connecting conductor (52) constitutes a second path (R2), Equipped with, The first path and the second path are connected in a cross-over configuration between the power conductor and the base conductor. The power conductor has a first power connection section (P1, N1) to which the first path is connected, and a second power connection section (P2, N2) located closer to the power converter than the first power connection section and to which the second path is connected. The power converter has a base conductor having a base connection portion, which includes a first base connection portion (B1) to which the second path is connected, and a second base connection portion (B2) to which the first path is connected at a position away from the first base connection portion such that an impedance exists between the first base connection portion and the second base connection portion.

Description

Capacitor modules and power converters Cross-reference of related applications This application is based on Japanese Patent Application No. 2024-193338, filed in Japan on November 4, 2024, and incorporates the contents of the basic application by reference in whole. The disclosures in this specification relate to capacitor modules and power conversion devices. Patent Document 1 discloses a Y-capacitor. The contents of the prior art document are incorporated by reference as explanations of the technical elements in this specification. A Y-capacitor consists of two capacitors. The series circuit of the two capacitors is connected between the positive and negative power supply lines. The nodes of the two capacitors are connected to the reference potential, which is earth potential. When current flows, the power supply line generates heat. This heat affects the Y-capacitor. For example, this heat can shorten the lifespan and degrade the performance of the Y-capacitor. Placing a Y-capacitor away from the power conductor to reduce thermal effects increases the impedance between the power conductor and the Y-capacitor, reducing the effectiveness of the Y-capacitor. Further improvements are needed in capacitor modules and power converters, both from the above-mentioned perspective and from other perspectives not mentioned. One of the objectives of this disclosure is to provide a capacitor module and power conversion device that can improve the effectiveness of a Y-capacitor while reducing thermal effects. A capacitor module, which is one aspect of the disclosure, A capacitor module connected to a power converter including a switching element, The positive electrode conductor connected to the DC positive terminal of the power converter, The negative electrode conductor connected to the DC negative terminal of the power converter, A base conductor connected to a grounding member that provides a reference potential, A Y capacitor includes a first capacitor and a second capacitor connected in series between a positive conductor and a negative conductor, and connected in parallel between a power supply conductor which is at least one of the positive conductor and the negative conductor and a base conductor, A first capacitor is electrically connected to the power supply conductor and mounted at a location away from the connection point with the power supply conductor, and together with the first capacitor, a first connecting conductor forms the first path, A second connecting conductor is electrically connected to the power supply conductor, and a second capacitor is mounted at a position away from the connection point with the power supply conductor, and together with the second capacitor, the second connecting conductor forms a second path. Equipped with, The first and second paths are connected in a cross-connection between the power conductor and the base conductor. The power conductor has a first power connection section to which a first path is connected, and a second power connection section located closer to the power converter than the first power connection section and to which a second path is connected. The base conductor has a base connection portion, which includes a first base connection portion to which a second path is connected, and a second base connection portion to which the first path is connected at a position away from the first base connection portion, such that an impedance exists between the first base connection portion and the second base connection portion. According to the disclosed capacitor module, the first and second Y-capacitors are positioned away from the power supply conductor. This reduces the influence of heat from the power supply conductor on the Y-capacitors. Furthermore, an impedance exists between the first and second base connections. Through cross-connection, the impedance between the first and second base connections, along with the impedance between the first and second power supply connections, the impedance of the first path, and the impedance of the second path, forms a Wheatstone bridge circuit. Therefore, by adjusting each impedance, the impedances of the first and second paths can be reduced, ideally to zero. Even while positioning the Y-capacitors away from the power supply conductor, the effectiveness of the Y-capacitors can be improved through impedance cancellation. Another aspect of the disclosure is a power converter, A power converter including a switching element, A capacitor module connected to a power converter, A power conversion device comprising, The capacitor module is The positive electrode conductor connected to the DC positive terminal of the power converter, The negative electrode conductor connected to the DC negative terminal of the power converter, A base conductor connected to a grounding member that provides a reference potential, A Y capacitor includes a first capacitor and a second capacitor connected in series between a positive conductor