EV Charger PCB Bus Bar Layout for Equal Current Distribution
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Solution Overview
Problem
Conventional electric vehicle charging stations face challenges in achieving equal resistance in electric paths, require complex infrastructure upgrades, and generate excessive heat due to power electronics, leading to increased size and energy consumption for cooling.
Innovation Solution
The implementation of a printed circuit board with surface-mount bus bars providing a low-resistance path for current distribution and a thermally enhanced inductor with a toroidal core and potting compound for efficient cooling, eliminating the need for harnesses and reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional harnesses and cables are used to interconnect power boards, then the charging station can be assembled, but the reliability of electrical connections deteriorates
Solution Approach 1:
The patent merges multiple separate power boards into a single integrated power board with multiple phases. This eliminates the need for external harnesses and cables to interconnect separate boards, thereby improving connection reliability while reducing device complexity. The integrated design ensures stable electrical connections through direct PCB traces rather than external connectors.
Solution Approach 2:
The patent segments the power board into multiple independent phases (e.g., Phase 1, Phase 2, Phase 3) that can be independently designed and optimized. Each phase is electrically isolated but physically integrated on the same board, allowing for modular functionality without requiring external interconnections. This segmentation enables reliable operation while maintaining integration benefits.
2Power
If multi-phase power conversion circuits are implemented, then power conversion capability is improved, but achieving equal resistance in electric paths becomes difficult
Solution Approach 1:
The patent intentionally introduces asymmetric elements in the form of balancing resistors to compensate for inherent asymmetries in the multi-phase circuit layout. By adding controlled resistance values to specific phases, the system achieves equal total resistance across all phases despite asymmetric physical routing. This allows high-power multi-phase operation while maintaining precise resistance equality for balanced current distribution.
3Ease of operation
If batteries are added to store energy, then installation requirements are reduced, but the size and energy consumption for cooling increase due to heat generation
Solution Approach 1:
The patent converts the harmful heat generated by power electronics into a beneficial thermal management opportunity. By integrating heatsinks directly with high-heat-components and using thermally conductive potting compound, the system efficiently dissipates heat that would otherwise require large active cooling systems. This passive thermal management approach reduces overall system size while maintaining ease of operation.
Solution Approach 2:
The patent merges thermal management functions directly into the power conversion circuitry by integrating heatsinks with power semiconductors and using potting compound that serves both electrical insulation and thermal conduction purposes. This combination eliminates the need for separate cooling systems, reducing the overall volume of the charging station while maintaining installation ease.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures equal current distribution, reduces the size and energy consumption of charging stations, and enhances thermal management, making the charging system more efficient and cost-effective.
Implementation Method 1
a rod pressing the potted body of the inductor against the heatsink
Data Source
AI summary
A charger for an electric vehicle (EV) comprises a printed circuit board (PCB) on which power circuits defining respective phases of a multi-phase power conversion circuit are disposed along a first dimension, a conductive input bus bar mounted on a surface of the PCB and extending along the first dimension, a conductive output bus bar mounted on the surface of the PCB and extending along the first dimension parallel to the input bus bar, an input connector disposed at an end of the input bus bar, configured to receive input power for the plurality of power circuits; and an output connector disposed at an end of the output bus bar, configured to receive output power from the plurality of power circuits. The input bus bar and the output bus bar provide a substantially equal, low-resistance resistance path for current distribution to each of the plurality of power circuits.