Multilevel Inverter Bus Layout for Low Parasitic Inductance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inverter designs suffer from parasitic inductance issues due to magnetic fields generated by current paths, leading to inefficiencies and electromagnetic interference.
Innovation Solution
The power module design includes a high side bus, low side bus, and AC output bus arranged in parallel planes, with currents flowing in opposite directions to cancel out magnetic fields, thereby minimizing parasitic inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional power loop configuration is used, then the inverter can operate, but parasitic inductance is generated causing electromagnetic interference and reduced efficiency
Solution Approach 1:
The patent applies magnetic field cancellation by positioning AC output buses between high side and low side buses in coplanar arrangements. The magnetic fields generated by currents in these buses are oriented to oppose each other, causing cancellation that eliminates parasitic inductance effects. This converts the harmful magnetic field generation into a beneficial cancellation mechanism, reducing electromagnetic interference and improving energy efficiency without sacrificing inverter functionality
Solution Approach 2:
The patent transitions from traditional three-dimensional bus arrangements to a coplanar two-dimensional configuration where high side, low side, and AC output buses all lie in the same plane. This dimensional simplification enables precise control of magnetic field orientations and facilitates effective cancellation while reducing the physical footprint and complexity of the power stage layout
2Object-affected harmful factors
If buses are arranged in traditional configurations, then connectivity is achieved, but electromagnetic interference increases due to parasitic inductance
Solution Approach 1:
The patent merges the high side bus, low side bus, and AC output bus into a single coplanar structure where all conductors lie in the same plane. This unified arrangement simplifies the overall device geometry, enables systematic magnetic field cancellation patterns, and reduces the number of discrete structural elements while maintaining all necessary electrical connections and minimizing electromagnetic interference
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 arrangement reduces parasitic inductance, minimizing ringing effects and electromagnetic interference, enhancing the efficiency and performance of the inverter.
Implementation Method 1
a first magnetic field is generated by the high side current, a second magnetic field is generated by the low side current, and a third magnetic field is generated by the AC output current
Implementation Method 2
the first magnetic field, the second magnetic field and the third magnetic field cancel each other to minimize or reduce an occurrence of a parasitic inductance
Data Source
AI summary
A vehicle includes an inverter having a power module. The power module includes a high side bus, a low side bus and an alternating current (AC) output bus. The high side bus includes a first switch, wherein a high side current is configured to flow through the first switch in a first direction. The high side bus is disposed in a plane. The low side bus includes a second switch, wherein a low side current is configured to flow through the second switch in the first direction. The low side bus is parallel to the high side bus. The alternating current (AC) output bus is parallel to the high side bus and the low side bus, wherein an output current flows through the AC output bus in a second direction opposite to the first direction.