Bus Bar Inductance Distribution for Switching Element Surge Control
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Solution Overview
Problem
The variation in inductance values along a bus bar connected to switching elements in an electronic circuit can lead to adverse effects on the driving operation of these elements, particularly causing surge voltages and increased power loss due to uneven current distribution and switching operations.
Innovation Solution
The electronic circuit design includes a bus bar with connection points for switching elements positioned to have different inductance values, ensuring that minimum on-resistance elements are connected at locations with smaller inductance for specific current regions, allowing for appropriate inductance values for large current flow and reducing surge voltages by preferentially routing current through elements with the lowest on-resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switching elements are connected to the bus bar at different locations to optimize current distribution, then power loss is reduced, but inductance variation causes surge voltage and adverse effects on switching operation
Solution Approach 1:
The patent applies local quality by connecting switching elements at different locations on the bus bar, where each location has a specific inductance value tailored to the current requirements of that switching element. This ensures that each element operates with optimal local inductance characteristics, reducing overall power loss while managing surge voltage through localized optimization rather than uniform connection.
Solution Approach 2:
The patent utilizes parameter changes by varying the inductance values at different bus bar connection locations. By changing the inductance parameter according to the specific current region and switching element requirements, the system achieves reduced power loss in high-current regions while controlling surge voltage through appropriate inductance selection for each switching operation.
2Speed
If connection points on the bus bar are positioned to minimize inductance, then switching speed is improved, but surge voltage increases causing adverse effects
Solution Approach 1:
The patent applies local quality by assigning different inductance values to different switching elements based on their specific operating conditions. Switching elements requiring faster switching speeds are connected at locations with lower inductance, while others are connected at locations with higher inductance to suppress surge voltage, achieving localized optimization of switching performance.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the inductance parameter at each bus bar connection location to match the switching characteristics of the connected element. This allows the system to change the effective inductance parameter dynamically through connection topology, optimizing switching speed where needed while controlling surge voltage elsewhere.
3Ease of manufacture
If uniform inductance is used for all switching elements, then manufacturing is simplified, but current distribution becomes uneven causing power loss
Solution Approach 1:
The patent applies local quality by creating non-uniform inductance distribution across the bus bar connection locations. Each switching element is connected at a location with inductance specifically optimized for its current handling requirements, ensuring optimal current distribution and minimized power loss, while the bus bar structure itself remains manufacturable through standard fabrication techniques.
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 effectively reduces surge voltages and power losses by optimizing current flow and inductance values, preventing damage to the electronic circuit and enhancing its operational efficiency across varying current regions.
Implementation Method 1
connection points between the minimum on-resistance elements and the bus bar are located at different locations to have mutually different inductances of respective conduction paths between the power source to the connection points located at the different locations
Data Source
AI summary
An electronic circuit includes: a bus bar connected to a power source having a positive terminal and a negative terminal; and a plurality of object switching elements as driving objects connected to the bus bar, the object switching elements forming a parallel connected circuit. The object switching elements include minimum on-resistance elements having minimum on-resistance compared to other object switching elements in a corresponding current region among mutually different current regions; and connection points between the minimum on-resistance elements and the bus bar are located at different locations to have mutually different inductance of respective conduction paths between the power source to the connection points located at the different locations.