Power Converter Shield Layout for High- and Low-Voltage Isolation
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Solution Overview
Problem
Existing power conversion devices face issues with low-voltage circuits malfunctioning due to noise and heat interference from high-voltage components, particularly in vehicles using electric motors.
Innovation Solution
A power conversion device with a shield body branching from a cooling plate is positioned between high-voltage and low-voltage electronic components, blocking heat and noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If high-voltage and low-voltage circuit units are accommodated in the same housing, then space utilization is improved, but the low-voltage circuit becomes susceptible to noise and heat interference from the high-voltage circuit
Solution Approach 1:
The housing is divided into a first space for the high-voltage circuit unit and a second space for the low-voltage circuit unit, with a wall portion separating them. This spatial segmentation allows both circuits to coexist in the same housing while preventing harmful interactions between them.
Solution Approach 2:
A wall portion is introduced as an intermediary structure between the high-voltage and low-voltage circuit units. This wall acts as a barrier that blocks noise and heat from the high-voltage circuit from affecting the low-voltage circuit, while still allowing both circuits to be accommodated in the same housing.
2Device complexity
If power conversion circuits are integrated in one package, then device complexity is reduced, but heat from power conversion circuits acts on sensitive low-voltage DC-DC converter circuit
Solution Approach 1:
The power conversion device is segmented into distinct functional modules: power conversion circuits in a first space and the low-voltage DC-DC converter circuit in a second space, separated by a wall portion. This maintains integration benefits while thermally isolating sensitive components.
Solution Approach 2:
The low-voltage DC-DC converter circuit is extracted from the high-heat environment of the power conversion circuits by placing it in a separate second space. This extraction protects the sensitive circuit from thermal effects while keeping it part of the integrated device.
3Manufacturing precision
If high-voltage electronic component and low-voltage electronic component are placed close together, then manufacturing precision is improved, but noise from high-voltage component interferes with low-voltage component operation
Solution Approach 1:
The housing space is segmented into high-voltage and low-voltage zones with a wall portion as the boundary. This segmentation enables precise placement of components within their respective zones while maintaining reliable operation by preventing electromagnetic interference between voltage domains.
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
Prevents malfunction of low-voltage circuits by effectively shielding them from heat and noise generated by high-voltage components, ensuring stable operation.
Implementation Method 1
a cooling plate accommodated in the housing and configured to cool the power conversion circuit by using a cooling fluid
Implementation Method 2
a shield body branching and protruding from the cooling plate is disposed between the high-voltage electronic component and the low-voltage electronic component... heat and noise from the high-voltage electronic component act on the low-voltage electronic component is prevented
Data Source
Figure 1
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AI summary
A power conversion device (8) includes: a housing (AH); a power conversion circuit (1) accommodated in the housing and configured to convert power; and a cooling plate (2) accommodated in the housing and configured to cool the power conversion circuit by using a cooling fluid. The power conversion circuit includes a high-voltage electronic component (14) through which high-voltage power flows and a low-voltage electronic component (15) through which low-voltage power having a voltage lower than a voltage of the high-voltage electronic component flows. A shield body (11) branching and protruding from the cooling plate is disposed between the high-voltage electronic component and the low-voltage electronic component in the power conversion circuit.