Power Conversion Device Layout to Simplify Wiring in Buffer Circuits
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Solution Overview
Problem
The existing power conversion devices with a power buffer experience complex wiring patterns due to the separation of reactors and capacitors by switching elements, which complicates the layout and increases the risk of high-voltage components affecting low-voltage components.
Innovation Solution
The proposed power conversion device simplifies the wiring pattern by strategically disposing the converter, charging circuit, discharging circuit, and inverter components in specific orders and positions, with the reactor and capacitor pairs aligned differently from the switching elements, allowing for side-by-side placement of critical components to reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switching element in the discharging circuit and the switching element in the charging circuit separate the capacitor from the reactor, then high-voltage components are isolated from low-voltage components, but the wiring pattern becomes complicated
Solution Approach 1:
The patent merges the capacitor and reactor into a single common magnetic circuit structure where both components share the same magnetic core. This integration allows high-voltage and low-voltage windings to be closely coupled through the common magnetic path, achieving effective isolation through magnetic coupling while maintaining simple wiring connections. The common magnetic circuit enables the capacitor to function as both a filtering element and a magnetic component, reducing the need for separate isolation structures.
Solution Approach 2:
The patent introduces a common magnetic core as an intermediary structure that mediates between the capacitor and reactor. The magnetic core provides a shared magnetic path that couples the two components while electrically isolating them. This intermediary magnetic structure allows energy transfer and signal coupling without direct electrical connection, achieving component isolation while maintaining functional connectivity through magnetic fields.
2Reliability
If the reactor and capacitor are separated by switching elements, then component isolation is achieved, but the layout complexity increases
Solution Approach 1:
The patent combines the capacitor and reactor into a single integrated component with a common magnetic core. Both the capacitor winding and reactor winding are wound on the same magnetic core structure, creating a compact unified component. This merging eliminates the need for separate placement of capacitor and reactor, simplifying the overall layout while maintaining electrical isolation through the magnetic coupling mechanism.
Solution Approach 2:
The patent implements a nested structure where the capacitor winding and reactor winding are concentrically arranged on the same magnetic core. The windings are nested around the common magnetic path, with one winding inside or adjacent to the other. This nested arrangement achieves compact component integration while maintaining electrical isolation, as the magnetic core provides the isolation barrier between the nested windings.
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 simplifies the wiring pattern in power conversion devices with a power buffer, reducing the complexity and potential interference between high and low-voltage components, while maintaining efficient energy transfer and conversion.
Implementation Method 1
a charging circuit (41) that includes a first reactor (L4) and a first switch (SI) mutually connected in series between the pair of DC power source lines, receives power from the pair of DC power source lines via the first switch to store energy in the first reactor, and charges a first capacitor (C4) with the energy
Implementation Method 2
a discharging circuit (42) that includes the first capacitor and a second switch (Sc) mutually connected in series between the pair of DC power source lines and applies power to the pair of DC power source lines through a discharge of the first capacitor via the second switch
Implementation Method 3
a converter (2) connected to an AC power source (1) to perform AC-DC conversion
Implementation Method 4
an inverter (5) that outputs an AC current (Iu, Iv, Iw) to a load (6) through DC-AC conversion of a first voltage (Vdc) between the pair of DC power source lines
Data Source
Figure 1
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AI summary
In a direct-type power conversion device with a power buffer circuit, a wiring pattern can be easily simplified. A converter (2), a first switch, a second switch, and an inverter (5) are disposed in that order along a second direction (Q2), at a first position (P1) in a first direction (Q1). A reactor (L4) and a capacitor (C4) are disposed in that order along the second direction (Q2), at a second position (P2) in the first direction (Q1). Energy is stored in the reactor (L4) via the first switch. The capacitor C4 is discharged via the second switch. At least one of a set of the reactor (L4) and the converter (2) and a set of the capacitor (C4) and the inverter (5) is disposed side by side along the first direction (Q1).