Current Detection Device Using Common Coil Section
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Solution Overview
Problem
Existing current detection devices require multiple current transformers, leading to increased device size and longer wiring lengths, which contribute to surge noise and reduced circuit stability.
Innovation Solution
A current detection device with a first and second current path, switching elements, and a common coil section that alternates induction currents, allowing for downsized design and reduced wiring length by using a single current transformer with bifilar-wound coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple current transformers are arranged to detect currents in different paths, then current detection capability is improved, but device size increases and wiring length increases
Solution Approach 1:
The patent combines multiple current detection functions into a single current transformer by using a common coil section that is shared by multiple current paths. This allows one current transformer to detect currents from multiple paths simultaneously, reducing the total number of current transformers needed and thereby decreasing device size while maintaining current detection capability.
Solution Approach 2:
The common coil section serves multiple functions by being part of multiple current transformers that detect currents in different paths. This multi-functional design allows a single coil section to perform what would traditionally require multiple separate coils, reducing overall device complexity and size.
2Measurement precision
If multiple current transformers are arranged to detect currents in different paths, then current detection capability is improved, but wiring length increases leading to surge noise and reduced circuit stability
Solution Approach 1:
By merging multiple current detection functions into a single current transformer with a common coil section, the patent reduces the total wiring length required. Shorter wiring reduces the antenna effect that causes surge noise, thereby improving circuit stability and reliability while maintaining current detection capability.
3Volume of stationary object
If a common coil section is shared by multiple current transformers, then device size is reduced and wiring length is reduced, but current detection complexity increases
Solution Approach 1:
The patent uses periodic action by alternating the induction current direction in the common coil section. This allows the same coil section to detect currents from different paths at different time periods, effectively reducing device size while managing detection complexity through time-division multiplexing rather than spatial separation.
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 solution enables a compact device with reduced wiring length, improved signal quality, and enhanced driving reliability by alternating induction currents through a single current transformer, effectively addressing the issues of device size and circuit stability.
Implementation Method 1
a coil section that generates an induction current by a current flowing through the first current path or the second current path
Data Source
AI summary
A current detection device is configured by a current path through which a first current flows, a current path through which a second current flows, a switching element that switches the current paths and allows the first current and the second current to flow alternately, a common coil section through which an induction current flows by the first current and the second current, and a turn current path that alternates a first induction current flowing through the coil section by the first current and a second induction current flowing through the coil section by the second current.