Power Converter Parasitic Inductance Counter Conductor
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Solution Overview
Problem
Existing electric power converters face challenges in effectively suppressing parasitic inductance, which leads to surge voltages and reduced wiring flexibility due to the need for sufficient spacing between terminals, and existing solutions fail to adequately cancel magnetic fluxes.
Innovation Solution
The implementation of a counter conductor disposed parallel and adjacent to the positive and negative electrode terminals, facing them in a height direction perpendicular to their aligned and protruding directions, along the alternating current path to induce currents that cancel magnetic fluxes, thereby reducing parasitic inductance and allowing for reduced terminal spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sufficient spaces are kept between the positive electrode terminal and the output terminal, and between the negative electrode terminal and the output terminal to achieve electrical insulation, then electrical insulation is improved, but the effect of reducing parasitic inductance deteriorates
Solution Approach 1:
The invention introduces a height direction (Z-axis) perpendicular to the plane containing the terminals. The counter conductor is positioned in this third dimension, facing the positive and negative electrode terminals from above or below, rather than requiring lateral spacing in the same plane. This dimensional transition allows magnetic flux cancellation without compromising electrical insulation distances.
Solution Approach 2:
The counter conductor acts as an intermediary element that mediates between the positive and negative electrode terminals. By positioning this conductor to face both terminals and carry alternating current in the opposite direction, it creates counteracting magnetic flux that cancels the parasitic inductance generated by the terminal currents, without requiring the terminals themselves to be repositioned.
2Reliability
If positional relationships between the positive electrode terminal, the negative electrode terminal, and the output terminal are defined in predetermined relationships, then electrical insulation is ensured, but wiring flexibility deteriorates
Solution Approach 1:
By moving the parasitic inductance suppression mechanism to the height direction through the counter conductor, the invention decouples the electrical insulation requirements (which remain in the lateral plane) from the inductance suppression requirements. This allows the terminals to maintain flexible lateral positioning for wiring connections while the counter conductor handles the magnetic flux cancellation in the vertical dimension.
3Object-affected harmful factors
If the counter conductor is disposed along the alternating current path facing the positive and negative electrode terminals, then parasitic inductance is reduced, but device complexity increases
Solution Approach 1:
The counter conductor serves multiple functions: it acts as an electrical connection element in the alternating current path, provides parasitic inductance suppression through counteracting magnetic flux, and can be integrated with existing terminal structures. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
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 suppresses parasitic inductance and high-frequency magnetic flux, preventing electromagnetic noise and enhancing design flexibility by eliminating the need for precise terminal positioning.
Implementation Method 1
an induced current flows in the counter conductor so as to cancel a magnetic flux caused by the alternating current flowing in the alternating current path
Implementation Method 2
circulating magnetic fluxes that are generated around various parts of a current route are in a state of canceling each other so that the parasitic inductance of the circuit is suppressed from being generated
Data Source
AI summary
An electric power converter includes a positive and a negative electrode terminals being disposed parallel and adjacent to each other, a positive electrode side switching device connected to the positive electrode terminal, a negative electrode side switching device connected to the negative electrode terminal, an output terminal connected to a connection point between the positive and the negative electrode side switching devices, and a counter conductor facing at least a portion of the positive electrode terminal and at least a portion of the negative electrode terminal in a height direction, the height direction being a direction perpendicular to both an aligned direction and a protruding direction of the positive and the negative electrode terminals. The counter conductor is disposed along a current path of an alternating current flowing through the positive electrode terminal, the positive electrode side switching device, the negative electrode side switching device, and the negative electrode terminal.