Inductor Winding with Sampling Part for Current Detection
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Solution Overview
Problem
Existing current detection methods in converter systems face challenges in achieving high accuracy and low temperature drift while minimizing space occupation and conduction loss, as they either suffer from high accuracy but large space occupation and heat dissipation issues, or low accuracy with significant temperature drift and conduction loss.
Innovation Solution
An inductor with a magnetic core and winding structure, where the winding includes a main body part made of low resistivity conductive material and a sampling part made of low temperature coefficient conductive material, connected in series, allowing for current sampling across the sampling part's ends, which reduces temperature drift and conduction loss while maintaining high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current detection resistor with high accuracy is used, then current detection accuracy is improved, but space occupation increases and heat dissipation issues occur
Solution Approach 1:
The patent merges the current detection function with the inductor winding by using the inductor's own DC resistance as the detection element. The inductor serves dual purposes: energy storage and current sensing, eliminating the need for a separate detection resistor and reducing space occupation.
Solution Approach 2:
The inductor is designed to perform multiple functions simultaneously: it acts as both the energy storage component and the current detection element. The DC resistance of the inductor winding is utilized for current sensing, making the inductor a multi-functional component that reduces overall circuit complexity and space requirements.
2Measurement precision
If a current detection resistor with high accuracy is used, then current detection accuracy is improved, but heat dissipation issues occur due to large conduction loss
Solution Approach 1:
The patent combines the energy storage function and current detection function into a single inductor component. By using the inductor's inherent DC resistance for detection, the system avoids adding extra detection resistors that would increase total conduction loss, thereby reducing heat dissipation while maintaining detection accuracy.
3Area of stationary object
If the on-resistance of switch is used for current detection, then space is saved and conduction loss is reduced, but current detection accuracy deteriorates and temperature drift increases
Solution Approach 1:
The patent uses the inherent DC resistance of the inductor winding, which is already present in the circuit, as the detection element. This approach leverages an existing component property rather than adding specialized detection components, achieving accurate current detection without increasing space or complexity.
4Area of stationary object
If the parasitic resistance of the output inductor is used for current detection, then space is saved and conduction loss is reduced, but current detection accuracy deteriorates and temperature drift increases
Solution Approach 1:
The patent changes the detection approach by using the controlled DC resistance of the inductor winding rather than relying on uncontrolled parasitic resistance. By designing the inductor with specific winding parameters and materials, the system achieves stable temperature characteristics while maintaining accurate current detection.
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 proposed inductor solution enables high-accuracy current detection with low temperature drift and reduced space requirements, minimizing detection loss and improving the compactness of the converter system.
Implementation Method 1
the main body part is formed of a low resistivity conductive material
Implementation Method 2
the sampling part is formed of a low temperature coefficient conductive material
Data Source
AI summary
The present disclosure discloses an inductor and a converter having the same. The inductor includes a magnetic core and a winding, the winding is provided within a window of the magnetic core, the winding includes a main body part and a sampling part, the main body part and the sampling part are connected in series, and a length ratio of the sampling part to the main body part is less than 2; wherein the main body part is formed of a low resistivity conductive material, the sampling part is formed of a low temperature coefficient conductive material, and a current flowing through the inductor is sampled across two ends of the sampling part. The inductor can obtain a current detection signal with high accuracy and low temperature drift with a compact structure, without increasing detection loss.