Power Source Control Circuit Module Noise Isolation
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Solution Overview
Problem
Existing power source control circuit modules face challenges in miniaturization due to noise interference between switching and linear regulator devices, which requires maintaining a specific distance between them to prevent noise propagation, hindering the miniaturization of the laminated body and the circuit module.
Innovation Solution
The power source control circuit module features a laminated body with a first internal ground electrode electrically divided for each regulator device, connected to different external ground connection terminals, and a second internal ground electrode for circuit elements susceptible to external noise, along with conductive via holes and a shielding member to reduce noise interference and allow for closer device arrangement without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual regulator devices are arranged with a given distance between them to prevent noise propagation, then noise interference is reduced, but the module size cannot be miniaturized
Solution Approach 1:
The ground electrode is segmented into multiple independent ground electrodes (first internal ground electrode, second internal ground electrode, third internal ground electrode) that are electrically isolated from each other. Each ground electrode is connected to a different external ground connection terminal, creating separate ground paths for different regulator devices. This segmentation prevents noise propagation between devices while allowing closer spacing, resolving the contradiction between noise control and miniaturization.
2Productivity
If the laminated body is miniaturized to reduce module size, then productivity improves, but noise interference between devices increases
Solution Approach 1:
The patent utilizes the vertical dimension by forming ground electrodes at different interfaces within the laminated body structure. The first internal ground electrode is at the interface between first and second dielectric layers, the second internal ground electrode is at the interface between second and third dielectric layers, and the third internal ground electrode is at the interface between third and fourth dielectric layers. This three-dimensional ground electrode arrangement provides effective noise isolation without increasing the horizontal footprint, enabling miniaturization while maintaining noise control.
3Reliability
If multiple ground connection terminals are used to isolate regulator devices, then noise propagation is prevented, but device complexity increases
Solution Approach 1:
The multiple ground connection terminals serve multiple functions: they provide electrical connection to different ground electrodes, enable noise isolation between devices, and facilitate external grounding. The back surface ground connection terminal connects to the third internal ground electrode and provides a common external ground reference point. This multi-functional design achieves effective noise isolation without proportionally increasing complexity.
Data Source
AI summary
In a power source control circuit module, switching regulator devices and a linear regulator device are mounted on a surface of a laminated body so as to be spaced from each other. In an interface between dielectric layers of the laminated body, first to fifth internal ground electrodes separated by an electrode non-formation portion are provided. The first, second, fourth, and fifth internal ground electrode are connected to the respective switching regulator devices. The third internal ground electrode is connected to the linear regulator device. The first to fifth internal ground electrodes are connected to respective different external ground terminals.