Rigid-Flex Electronic Circuit With Embedded Busbars
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Solution Overview
Problem
Existing electronic circuits for turbomachines face challenges in compactness and integration, particularly when combining high-power and low-power signals, which leads to perturbations and increased size and weight due to required filtering.
Innovation Solution
The development of a rigid-flex electronic circuit with embedded busbars, allowing for a compact design that can be laid flat against a circular electric motor, incorporating both high-power and low-power electronic networks within the same printed circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electronic circuits are positioned against a circular electric motor to optimise mechanical integration, then compactness and integration are improved, but perturbations between power and low-power signals increase
Solution Approach 1:
The electronic circuit is divided into multiple printed circuit boards, each dedicated to specific functions (power electronics, low-power signals, filtering). This segmentation isolates harmful electromagnetic perturbations to specific areas while maintaining overall compact integration against the motor
Solution Approach 2:
Filtering functions are extracted as separate dedicated printed circuit boards positioned between power and low-power signal areas. This removes the harmful interaction by physically separating the sources and destinations of electromagnetic perturbations while maintaining signal integrity
2Object-generated harmful factors
If filter circuits are added to reduce perturbations, then signal quality is improved, but the size and weight of the system increase
Solution Approach 1:
The filtering function is integrated into the lateral arrangement of printed circuit boards rather than adding bulk in the third dimension. Multiple thin PCBs are stacked or arranged side-by-side, providing effective filtering coverage across the power-to-low-power signal path without substantial volume or weight increase
3Reliability
If high energy capacitors are added to reduce perturbations, then signal stability is improved, but device complexity and cost increase
Solution Approach 1:
Capacitor functions are merged into the ground planes and power distribution networks of the printed circuit boards themselves. Large-area copper traces and ground planes on multiple PCB layers provide distributed capacitance that stabilizes signals without requiring discrete high-energy capacitor components
Solution Approach 2:
The printed circuit board ground planes and power traces serve multiple functions simultaneously: they provide mechanical support, electrical connections, electromagnetic shielding, and energy storage through their inherent capacitance. This eliminates the need for separate dedicated components for each function
Data Source
AI summary
The invention relates to an electronic circuit (1) comprising a plurality of printed circuits (2) connected by at least one bus bar (4), each printed circuit (2) comprising at least two superposed layers enclosing at least a portion of said at least one bus bar (4), so as to cover said at least one bus bar (4).