Capacitor Board Layout for Low-Inductance Power Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing capacitor board units experience increased temperature and AC current components that lead to deterioration and voltage pulsation, complicating the structure and increasing costs.
Innovation Solution
A capacitor board unit design with a bus bar and wiring board configuration that minimizes DC resistance and inductance, directing DC current through the bus bars and AC current through the wiring and capacitors, thereby suppressing temperature and AC current components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If current is increased to meet high output requests, then power output is improved, but temperature increase and heat generation worsen
Solution Approach 1:
The invention divides the current path into two separate paths: a low-impedance path for DC current (through bus bars) and a high-impedance path for AC current (through wiring and capacitors). This segmentation allows DC current to flow without excessive heat generation while directing AC current through the capacitor for smoothing, thereby resolving the temperature increase problem when high current is required.
Solution Approach 2:
The capacitor acts as an intermediary element that selectively interacts with different current components. It allows DC current to pass through to the load while blocking and smoothing AC current components. This intermediary function enables the system to handle high current requests without the capacitor experiencing excessive temperature rise, as the AC current is smoothed rather than directly dissipated as heat.
2Ease of operation
If DC current and AC current flow together in the metal conductive board, then connectivity is improved, but voltage pulsation and AC current component flow to outside worsen
Solution Approach 1:
The invention segments the current flow paths by creating distinct impedance characteristics for DC and AC currents. The bus bar provides a low-impedance path for DC current, while the wiring board and capacitor create a high-impedance path for AC current. This segmentation ensures that AC current is smoothed by the capacitor and does not flow to external devices, eliminating voltage pulsation while maintaining proper current connectivity.
Solution Approach 2:
The invention changes the impedance parameter of different current paths. By designing the bus bar with low DC resistance and the wiring board with higher AC impedance, the system selectively guides DC and AC currents through different paths. This parameter change ensures that AC current components are smoothed by the capacitor rather than flowing to external devices, thereby suppressing voltage pulsation while maintaining connectivity.
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
The design effectively suppresses temperature increase and AC current components, preventing capacitor deterioration and voltage pulsation, ensuring stable operation and reduced complexity and cost.
Implementation Method 1
the capacitor board unit includes a plurality of capacitors each having a positive capacitor terminal and a negative capacitor terminal, the positive capacitor terminal and the negative capacitor terminal being connected to the wiring
Implementation Method 2
a positive bus bar having at least one positive power supply terminal connected to a positive electrode of a power supply, a plurality of positive load terminals respectively connected to positive electrodes of a plurality of loads
Implementation Method 3
a capacitor for smoothing voltage in which an AC component is superposed on a DC component
Data Source
AI summary
The sum of the DC resistance value from the positive power supply terminal to each positive load terminal and the DC resistance value from the negative power supply terminal to each negative load terminal is smaller than the sum of the DC resistance value between the positive power supply terminal and the positive load terminal and the DC resistance value between the negative power supply terminal and the negative load terminal. In addition, the inductance value between the positive load terminal and the negative load terminal through the positive smoothing terminals, the wirings, the capacitors, and the negative smoothing terminals is smaller than the sum of the inductance values from the positive power supply terminal to the positive load terminal and from the negative power supply terminal to the negative load terminal.