Shielded Circuit Ground Isolation for Accurate RF Malfunction Evaluation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional direct RF power injection tests cannot accurately evaluate the malfunction of an electric circuit in a state that reflects its actual usage.
Innovation Solution
An electric circuit evaluation method where a designated circuit is placed inside a shield structure, a noise signal is inputted, and a short-circuit is established between the shield structure's ground and the noise source's ground, with the circuit's ground isolated from the shield structure's ground, allowing for a malfunction evaluation that reflects actual usage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional DPI tests are performed without shield structure isolation, then the test setup is simple, but the evaluation does not reflect actual usage conditions
Solution Approach 1:
A shield structure is introduced as an intermediary component between the noise source and the designated circuit. The shield structure with its specific grounding configuration (short-circuiting shield ground to noise source ground while isolating circuit ground from shield ground) acts as a mediator to create more realistic electromagnetic interference conditions, thereby improving evaluation accuracy without directly modifying the circuit under test
Solution Approach 2:
The grounding parameters of the test setup are changed by implementing a specific grounding configuration where the shield ground is short-circuited to the noise source ground, and the circuit ground is isolated from the shield ground. This parameter change transforms the test environment to better reflect actual usage conditions, improving measurement precision
2Reliability
If ground isolation is implemented between circuit ground and shield ground, then malfunction evaluation accuracy improves, but test configuration complexity increases
Solution Approach 1:
The grounding system is segmented into separate domains: the noise source ground domain (short-circuited to shield ground) and the circuit ground domain (isolated from shield ground). This segmentation allows independent control of each grounding domain, enabling accurate malfunction evaluation while managing configuration complexity through modular grounding design
Data Source
AI summary
The electric circuit evaluation method according to the present invention is characterized in that a designated electric circuit is placed inside a shield structure, a noise signal for a malfunction test is inputted to the designated electric circuit, a short-circuit is established between a ground of the shield structure and a ground of a noise source for inputting a noise signal for a malfunction test to the designated electric circuit, and the ground of the designated electric circuit and the ground of the shield structure are isolated.