DEVICE FOR SUPPRESSING EMC COMMON-MODE INTERFERENCE IN MOTOR VEHICLE HIGH-VOLTAGE APPILCATIONS

Abstract

A device for suppressing EMC common-mode interference in motor vehicle high-voltage applications, having Y-capacitors in a V-configuration between positive and negative high voltage (HV+, HV−) and chassis ground. Y-capacitors can be connected in a V-configuration to be connected to the chassis ground via series-connected Y-capacitors.

Claims

1. A device for suppressing EMC common-mode interference in motor vehicle high-voltage applications, having Y capacitors in a V configuration between the positive and negative high voltages (HV+, HV−) and the chassis ground, wherein the Y capacitors connected in a V configuration are connected to the chassis ground via Y capacitors connected in series.

2. The device as claimed in claim 1, wherein the Y capacitors are connected in series in accordance with the standard LV123 to achieve creepage distances according to the standard LV123.

3. The device as claimed in claim 1, wherein an X capacitor is formed by the series circuit of the Y capacitors.

4. A heating core of a heater comprising the device for suppressing EMC common-mode interference of claim 1 and a capacitive cover opposite the chassis.

5. The heating core of claim 4, wherein the device for suppressing EMC common-mode interference comprises Y capacitors are connected in series in accordance with the standard LV123 to achieve creepage distances according to the standard LV123

6. The heating core of claim 4, wherein the device for suppressing EMC common-mode interference comprises an X capacitor is formed by the series circuit of the Y capacitors.

7. The heating core of claim 4, wherein the device for suppressing EMC common-mode interference comprises Y capacitors are connected in series in accordance with the standard LV123 to achieve creepage distances according to the standard LV123 and wherein an X capacitor is formed by the series circuit of the Y capacitors.

8. The device as claimed in claim 1, wherein the Y capacitors are connected in series in accordance with the standard LV123 to achieve creepage distances according to the standard LV123 and wherein an X capacitor is formed by the series circuit of the Y capacitors.

Description

[0023] The disclosure is explained in greater detail below with reference to the drawing, in which:

[0024] FIG. 1 shows a device for suppressing EMC common-mode interference with Y2 capacitors connected in a V configuration between HV+ and the chassis and HV− and the chassis according to the prior art,

[0025] FIG. 2 shows a device for suppressing EMC common-mode interference with Y capacitors, which are not Y2-rated, connected in a V configuration between HV+ and the chassis and HV− and the chassis according to the prior art, and

[0026] FIG. 3 shows an embodiment of the device according to the disclosure for suppressing EMC common-mode interference with Y capacitors, which are not Y2-rated, connected in a V configuration between HV+ and the chassis and HV− and the chassis.

[0027] FIGS. 1 and 2 are explained in the introduction in relation to the prior art.

[0028] An embodiment of the device according to the disclosure is shown in FIG. 3.

[0029] This embodiment differs from the device shown in FIG. 2 in that the Y capacitors, which are not Y2-rated, connected in a V configuration are connected to the chassis ground via Y capacitors connected in series.

[0030] The series circuit is configured in such a way that a series circuit according to standard LV123 is obtained and the required creepage distances are achieved. This series circuit can be formed with a smaller number of capacitors than in the case of the prior art according to FIG. 2.

[0031] The circuit of the device according to the disclosure can be implemented with lower costs than in the prior art because low-voltage capacitors can be used as Y capacitors, in contrast to the Y2-rated high-voltage capacitors that are required in the prior art.

[0032] Furthermore, an X capacitor is formed by the series circuit of the Y capacitors, which X capacitor contributes to optimizing the suppression of EMC common-mode interference achievable with the device according to the disclosure without additional component complexity in order to provide the function of an X capacitor. The X capacitor provides suppression of high-frequency common-mode interference.