Magnetic Shield Plate for Power Conversion Current Detection
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Solution Overview
Problem
Existing power conversion devices face challenges in accurately detecting electric current due to disturbance magnetic fields, and achieving design flexibility is compromised by the need for specific positional relationships between magnetic components and bus bars, limiting their commercialization as discrete devices.
Innovation Solution
A power conversion device is designed with bus bars, current sensor elements, and a plate-like magnetic shield plate arranged on a straight line connecting the magnetic component and the current sensor element, shielding magnetic fluxes from the magnetic component to enhance detection accuracy while maintaining design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic shield materials are provided along the bus bar to surround the current sensor element, then the shielding effect against disturbance magnetic fields is improved, but the design flexibility is reduced due to required specific positional relationships
Solution Approach 1:
A magnetic shield plate is introduced as an intermediary component positioned between the magnetic component and the current sensor element. This plate selectively shields disturbance magnetic fields from the magnetic component while allowing magnetic fields from the bus bar to reach the sensor, thereby maintaining detection accuracy without constraining the overall device layout
Solution Approach 2:
The magnetic shield plate is strategically positioned to provide localized shielding only in the region between the magnetic component and the current sensor element. This localized approach shields only the necessary disturbance fields without requiring comprehensive shielding structures, thus preserving design flexibility in other areas of the device
2Measurement precision
If the positional relationship between magnetic component and bus bar is defined to achieve sufficient shielding effect, then current detection accuracy is improved, but design flexibility and commercialization adaptability are reduced
Solution Approach 1:
The magnetic shield plate serves as a mediator that decouples the positional relationship requirements. By placing the shield plate between the magnetic component and sensor, the system achieves accurate current detection without requiring fixed positional relationships between the magnetic component and bus bar, facilitating easier manufacturing and adaptation
3Object-affected harmful factors
If magnetic shield materials are arranged to surround the current sensor element, then the effect of disturbance magnetic field is reduced, but the complexity of the device structure increases
Solution Approach 1:
Instead of surrounding the current sensor element with complex magnetic shield materials, a simple magnetic shield plate is placed as an intermediary between the magnetic component and sensor. This single plate configuration effectively reduces disturbance magnetic field effects while maintaining simple device structure
Solution Approach 2:
The shielding function is extracted from the bus bar structure and implemented as a separate, simple magnetic shield plate. This extraction allows the shielding effect to be achieved independently without increasing the complexity of the bus bar or sensor element structures
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 allows for high-accuracy electric current detection while ensuring design flexibility, effectively reducing the impact of disturbance magnetic fields and optimizing the positional relationship between magnetic components and bus bars.
Implementation Method 1
a plate-like magnetic shield plate which is arranged on a straight line connecting the magnetic component and the current sensor element, and is configured to shield magnetic fluxes directed from the magnetic component to one or more current sensor elements
Implementation Method 2
current sensor elements which are respectively provided for the plurality of bus bars, and are configured to detect magnetic fluxes generated when electric currents flow through the plurality of bus bars
Implementation Method 3
The electric current flowing through the bus bar generates magnetic fluxes
Data Source
AI summary
A power conversion device which is premised on converting electric power supplied from a power source with use of a magnetic component, includes: a plurality of bus bars configured to supply electric power to a load; current sensor elements which are respectively provided for the plurality of bus bars, and are configured to detect magnetic fluxes generated when electric currents flow through the plurality of bus bars; and a plate-like magnetic shield plate which is arranged on a straight line connecting the magnetic component and the current sensor element, and is configured to shield magnetic fluxes directed from the magnetic component to one or more current sensor elements.