Power Conversion Device Intermediate Terminal Layout
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Solution Overview
Problem
In existing power conversion devices, the terminal of the secondary winding, where the rectifier element is connected, is positioned between the smoothing coil and the intermediate terminal, making it difficult to shorten the path between the smoothing coil and the intermediate terminal, which hinders the reduction of impedance and thus the smoothing capability.
Innovation Solution
A power conversion device configuration where the first and second rectifier elements are connected to the ends of the first and second secondary windings, respectively, and the smoothing capacitor is connected to both windings' ends, with the connection portion between them located between the rectifier terminals, allowing direct connection to the intermediate terminal and reducing impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rectifier element terminal is arranged between the smoothing coil and the intermediate terminal connection portion, then the rectifier element can be connected to the secondary winding, but the path length between the smoothing coil and the intermediate terminal increases, resulting in higher impedance
Solution Approach 1:
The patent applies dimensional reconfiguration by changing the spatial arrangement of terminals from a linear sequence to a two-dimensional layout on the base. The intermediate terminal is positioned at a location that allows direct connection to the smoothing coil without passing through the rectifier element terminal, effectively creating a parallel path in a different spatial dimension. This resolves the contradiction by maintaining rectifier connection functionality while shortening the impedance-critical path.
Solution Approach 2:
The base serves as an intermediary structure that provides separate connection points for different components. By establishing the intermediate terminal as a dedicated ground connection point on the base, the patent creates an independent path for the smoothing coil that does not rely on the rectifier element terminal position. This intermediary structure enables the smoothing path to be optimized separately from the rectifier connection requirements.
2Reliability
If the path from the smoothing coil to the intermediate terminal is not shortened, then the impedance remains high, but the LC filter cannot function optimally for output smoothing
Solution Approach 1:
The patent changes the geometric parameter of the connection path by repositioning the intermediate terminal to create a shorter physical distance between the smoothing coil and the ground connection. This parameter change directly reduces the impedance (Z = R + jωL, where both R and L are proportional to path length), thereby reducing energy loss and enabling the LC filter to function optimally for output smoothing.
Data Source
AI summary
The power conversion device in which a transformer, a first rectifier element, a second rectifier element, a smoothing coil, and a smoothing capacitor are placed on a base, the transformer including a secondary winding including a first secondary winding and a second secondary winding, and an intermediate terminal at which to connect the secondary winding and the base, the smoothing coil including a smoothing coil first terminal and a smoothing coil second terminal, the smoothing capacitor being connected to the smoothing coil second terminal and the intermediate terminal, another end side of the first secondary winding and another end side of the second secondary winding being connected to each other at a connection portion, the connection portion being located between the first terminal and the second terminal, and the first terminal or the second terminal being located between the intermediate terminal and the connection portion.