BCI suppression method and system for a device

A technology of equipment and test methods, applied in the direction of measuring interference from external sources, components of electrical measuring instruments, instruments, etc., can solve problems affecting equipment performance, interference, etc., achieve good electromagnetic compatibility, low cost, and easy to implement Effect

CN109633312BActive Publication Date: 2021-06-04明见(厦门)技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-06-04

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Abstract

The invention relates to the technical field of equipment electromagnetic compatibility, in particular to a BCI suppression method and system for equipment. The invention discloses a BCI suppression method and system for equipment, wherein the method is: connect the internal ground of the equipment to the conductive casing of the equipment through a band-stop filter, and the cut-off frequency of the band-stop filter is the same as that of the equipment. Corresponds to the frequency that will be interfered by BCI. The invention also has the ability to suppress BCI interference under the condition of ensuring better electromagnetic compatibility performance.
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Description

technical field

[0001] The invention belongs to the technical field of equipment electromagnetic compatibility, and in particular relates to a BCI suppression method and system for equipment. Background technique

[0002] At present, for vehicle-mounted equipment with a metal casing, the vehicle is usually directly locked on the frame when it is installed. Therefore, when doing EMC (electromagnetic compatibility) testing, the metal casing is generally grounded for testing. The metal casing is equivalent to a shielding cover, so it is necessary to connect the internal ground of the device to the metal casing, so that the radiation generated by the internal circuit of the device can be absorbed by the metal casing, thus having better electromagnetic compatibility. However, after the metal casing is grounded, BCI (Big Current Injection) is relatively easy to inject into the device and cause various disturbances, affecting the performance of the device. Contents of the inventi...

Examples

Embodiment Construction

[0020] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] The present invention will be described below by taking a vehicle-mounted device as an example, but not limited thereto.

[0022] Such as figure 1 As shown, a BCI suppression method for a vehicle-mounted device includes: connecting the internal ground of the device to the conductive shell of the device through a band-stop filter, the cut-off frequency of the band-stop filter is the same as that of the device that will be interfered by BCI Corresponding to the frequency, specifically the cut-off frequency of the band-stop filter is the frequency at which the device will be interfered by the BCI,

[0023] The band stop filter blocks the signal of the frequency that the device will be interfered by BCI, so that when BCI is injected at this frequency, there is a relatively large impedance, and BCI is not easy to inject into the device at this fre...