Current Transformer Creepage Distance via Insulating Adhesive
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Solution Overview
Problem
Conventional current transformers have insufficient electrical safety distances between the primary winding coil and secondary winding coil, and between the magnetic core assembly and secondary winding coil, failing to meet stringent safety regulations due to inadequate isolation.
Innovation Solution
Incorporating a covering member or insulating adhesive to increase the creepage distance between the conductive pillar and the primary winding coil, and between the conductive pillar and the magnetic core assembly, by using a bobbin with a concave structure and a conductive pillar, which is either shielded by the covering member or encapsulated with the adhesive, thereby enhancing electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the primary winding coil and magnetic core assembly are placed close to the secondary winding coil to reduce size, then the device compactness is improved, but the electrical safety distance becomes insufficient
Solution Approach 1:
The patent introduces an insulating adhesive as an intermediary substance filled into the concave structure to provide electrical isolation between the conductive pillar (secondary winding) and the magnetic core assembly. This mediator enables the components to be placed closer together while maintaining sufficient creepage distance for safety
Solution Approach 2:
The insulating adhesive acts as a thin film barrier that provides electrical insulation between conductive parts. This thin insulating layer allows compact arrangement of components while ensuring the required electrical safety distance is maintained
2Reliability
If the creepage distance between primary winding coil and secondary winding coil is increased to meet safety regulations, then the electrical safety is improved, but the device size increases
Solution Approach 1:
The patent applies insulating adhesive locally in the concave structure where the conductive pillar contacts or approaches the magnetic core assembly. This localized insulation provides the necessary creepage distance enhancement only at critical points, rather than increasing the overall device dimensions uniformly
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
The increased creepage distances enhance the electrical safety of the current transformer, ensuring compliance with safety regulations and allowing the conductive pillar to handle higher output currents.
Implementation Method 1
The insulating adhesive is filled into the concave structure to shield the conductive pillar. The conductive pillar and the second magnetic core are separated from each other by the insulating adhesive, so that a creepage distance between the conductive pillar and the primary winding coil and a creepage distance between the conductive pillar and the magnetic core assembly are increased.
Implementation Method 2
When an electric current flows in the primary winding coil, a magnetic field is produced in the magnetic core assembly and an induced current is generated in the secondary winding coil.
Data Source
AI summary
A current transformer includes a bobbin, a primary winding coil, a conductive pillar, a magnetic core assembly, and a covering member. The bobbin includes a bobbin body and a concave structure. The primary winding coil is wound around the bobbin body. The conductive pillar is partially accommodated within the concave structure. The magnetic core assembly includes a first magnetic core and a second magnetic core. The first magnetic core and the second magnetic core are partially embedded into the channel. The concave structure is partially enclosed by the second magnetic core. The covering member cooperates with the concave structure to shield the conductive pillar. The conductive pillar and the second magnetic core are separated from each other by the covering member, so that a creepage distance between the conductive pillar and the primary winding coil and a creepage distance between the conductive pillar and the magnetic core assembly are increased.