Power Busbar Capacitor Layout for Current Noise Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power control apparatuses require a large number of components to effectively suppress noise, leading to increased complexity and part count, particularly in in-vehicle systems where noise filtering is crucial for efficient power conversion between batteries and electric motors.
Innovation Solution
A power control apparatus design featuring a first capacitor connected in parallel with electrical components and a second capacitor connected to a reference potential, where the impedance of specific conducting paths directs current noise to the second capacitor, allowing for noise removal without additional components, thereby reducing the overall part count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional noise suppressing circuits (DC smoothing circuit with capacitor, noise filter circuit with capacitor) are added to the power control apparatus, then noise suppression capability is improved, but the number of parts increases
Solution Approach 1:
The patent combines the noise suppression function with the existing DC smoothing circuit capacitor by connecting the second capacitor to one of the first or second wirings. This merging approach allows the noise filter functionality to be integrated into the existing circuit structure rather than adding completely separate noise suppression circuits, thereby improving noise suppression capability while minimizing the increase in part count.
Solution Approach 2:
The second capacitor serves multiple functions: it acts as both a noise filter and part of the DC smoothing circuit. By designing the circuit so that the second capacitor can handle both noise suppression and voltage smoothing tasks, the patent reduces the need for separate dedicated noise filter components, thus improving noise suppression while keeping the number of parts manageable.
2Object-affected harmful factors
If the second capacitor is connected to both first wiring and second wiring, then noise suppression is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by making the connection of the second capacitor selective rather than symmetric. The second capacitor is connected to only one of the first or second wirings based on the impedance condition, rather than requiring connections to both wirings. This localized approach maintains effective noise suppression while simplifying the circuit connection complexity.
Solution Approach 2:
The patent uses parameter changes by relying on the impedance relationship between conducting paths rather than fixed connection topologies. The noise suppression effectiveness is achieved through the impedance condition (higher impedance path through first capacitor versus lower impedance path through second capacitor), allowing the circuit to adapt its noise filtering behavior based on electrical parameters rather than complex physical connections.
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 design effectively removes current noise from the power supply busbars, reducing the number of parts required and enhancing design flexibility by allowing the second capacitor to be located outside the main circuit case, while maintaining effective noise suppression.
Implementation Method 1
a second capacitor which is connected to one of the first wiring and the second wiring and is connected to a reference potential portion having a constant potential
Implementation Method 2
an impedance of a first conducting path between another side connection point, which is connected to the first capacitor, of the other one of the first wiring and the second wiring and the power supply not through the first capacitor is higher than an impedance of a second conducting path between the another side connection point and the second capacitor through the first capacitor
Data Source
AI summary
A power control apparatus, comprising: a first wiring and a second wiring connected to a power source; a first capacitor connected to the first wiring and the second wiring; an electrical component including a plurality of switches connected in parallel with the first capacitor through the first wiring and the second wiring; and a second capacitor which is connected to one of the first wiring and the second wiring and is connected to a reference potential portion having a constant potential, wherein an impedance of a first conducting path between another side connection point, which is connected to the first capacitor, of the other one of the first wiring and the second wiring and the power supply not through the first capacitor, is higher than an impedance of a second conducting path between the another side connection point and the second capacitor through the first capacitor.