Power Semiconductor Connection Plates for Current Asymmetry
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Solution Overview
Problem
Power semiconductor switching elements connected in parallel experience current asymmetry due to inductive effects and the skin effect, leading to uneven current distribution and influenced switching behavior, especially during high-frequency switching processes.
Innovation Solution
The power semiconductor arrangement employs slotted and bent connection plates to reduce inductance asymmetry, with slots increasing current density and bending reducing high switching current densities, ensuring a more uniform current distribution by altering the relative position of connection plates' edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power semiconductor switching elements are connected in parallel with common connection plates, then the handling and installation is simplified, but current asymmetry occurs due to inductive effects and skin effect
Solution Approach 1:
The connection plates are segmented into multiple sections by slots that extend from the end edge toward the in-feed edge. This segmentation divides the continuous connection plate into discrete sections, each associated with specific load current terminals, thereby reducing mutual inductive coupling between adjacent terminals while maintaining electrical connectivity through the connecting web.
Solution Approach 2:
The connection plates are bent along their longitudinal edges to form angular sections that protrude toward adjacent connection plates. This asymmetric geometric design intentionally creates non-uniform spacing between connection plates, which compensates for the skin effect by reducing the distance between inner connection plates and increasing the distance for outer connection plates, thereby balancing the commutation inductance across all switching elements.
2Device complexity
If common connection plates are used for all load current terminals, then device complexity is reduced, but inductance asymmetry increases leading to uneven current distribution
Solution Approach 1:
The connection plates are segmented into multiple sections by slots that extend from the end edge toward the in-feed edge. This segmentation divides the continuous connection plate into discrete sections, each associated with specific load current terminals, thereby reducing mutual inductive coupling between adjacent terminals while maintaining electrical connectivity through the connecting web.
Solution Approach 2:
The connection plates are bent along their longitudinal edges to form angular sections that protrude in the direction of adjacent connection plates. This three-dimensional geometric modification adds a new spatial dimension to the otherwise planar connection plate structure, enabling compensation for skin effect by creating non-uniform spacing that balances commutation inductance across all switching elements.
3Area of stationary object
If connection plates are positioned close together, then area is reduced, but skin effect causes higher current density at edges leading to inductance asymmetry
Solution Approach 1:
The connection plates are bent along their longitudinal edges to form angular sections that protrude toward adjacent connection plates. This asymmetric geometric design intentionally creates non-uniform spacing between connection plates, which compensates for the skin effect by reducing the distance between inner connection plates and increasing the distance for outer connection plates, thereby balancing the commutation inductance across all switching elements.
Solution Approach 2:
The connection plates are bent along their longitudinal edges to form angular sections that protrude in the direction of adjacent connection plates. This three-dimensional geometric modification adds a new spatial dimension to the otherwise planar connection plate structure, enabling compensation for skin effect by creating non-uniform spacing that balances commutation inductance across all switching elements.
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 inductance asymmetry and commutation inductance, improving the switching behavior of power semiconductor switching elements by ensuring a more uniform current distribution, particularly during high-frequency switching processes.
Implementation Method 1
it has also been found that the so-called skin effect leads to an uneven current distribution, in particular, in the case of high-frequency current components during the switching process, since the high-frequency current components propagate close to surfaces and, in particular, close to edges
Implementation Method 2
These inductive effects affect not only the control voltage and cause a deviation of the effective control voltage from the specified control voltage, but also affect the load current output and load current input
Data Source
AI summary
A power semiconductor arrangement includes a plurality of half-bridges arranged in parallel alongside one another by way of a longer longitudinal side of the half-bridges. An input load current terminal, an output load current terminal and a phase terminal are arranged on a top side of each of the half-bridges, the input load current terminals and the output load current terminals being arranged on an imaginary line that runs orthogonal to the longer longitudinal side of the half-bridges. First connection plates are connected to respective ones of the output load current terminals, and second connection plates are connected to respective ones of the input load current terminals. The first connection plates are arranged above the second connection plates. The first and the second connection plates are arranged in parallel with one another and electrically insulated from one another.