Inductor with Segmented Windings to Reduce Parasitic Capacitance
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Solution Overview
Problem
Inductors with parasitic capacitance between terminals lead to increased total parasitic capacitance, resulting in higher losses and noise in conversion circuits, particularly in power factor correction circuits, due to the proximity of leader lines, which complicates noise filtering and increases the size and cost of the apparatus.
Innovation Solution
The design features a ring-like core with conducting wires wound around separate areas to prevent parasitic capacitance between terminals, ensuring magnetic fluxes align and maintaining a distance that eliminates or minimizes parasitic capacitance, thereby reducing total parasitic capacitance and associated losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conducting wires are wound around a magnetic substance with leader lines positioned close together, then the inductor achieves compact size and efficient winding, but parasitic capacitance between leader lines increases significantly
Solution Approach 1:
The patent divides the single continuous winding into multiple separate windings, each with its own leader lines. By segmenting the winding structure and positioning leader lines of different windings at opposite ends of the magnetic substance, the parasitic capacitance between leader lines is significantly reduced while maintaining compact inductor dimensions.
2Loss of energy
If multiple conducting wires are used in parallel to reduce skin effect losses, then high-frequency current capacity increases, but total parasitic capacitance between terminals increases
Solution Approach 1:
The patent segments the parallel conducting wires into separate windings wrapped around different portions of the magnetic substance. Each winding's leader lines are positioned at opposite ends, preventing the accumulation of parasitic capacitance that would occur if all parallel wires terminated at the same two points.
3Area of stationary object
If leader lines are positioned close together for compact terminal configuration, then device footprint is reduced, but noise filtering complexity and cost increase
Solution Approach 1:
Instead of positioning leader lines close together at the same location, the patent inverts the approach by positioning leader lines at opposite ends of the magnetic substance. This spatial inversion naturally reduces parasitic capacitance and simplifies noise filtering requirements without increasing the device footprint.
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 significantly reduces parasitic capacitance, minimizing losses in switching devices and conducted noise, allowing for a smaller, more efficient noise filter, and reducing the overall size and cost of the apparatus.
Implementation Method 1
conducting wires which are wound around the ring-like core part so that magnetic fluxes generated by a current flowing through the respective windings can be trued up in the same direction
Implementation Method 2
when a high-frequency current flows in a conducting wire, the current generally flows only near the surface of the conducting wire due to skin effect so as to increase loss
Implementation Method 3
the distance between the leader line 51 and the leader line 52 is apt to be small enough to generate the parasitic capacitance b between the leader lines 51 and 52
Data Source
AI summary
Two conducting wires are used in one embodiment of an inductor. Opposite ends of each of the conducting wires are connected to leader lines (terminals) shared by the conducting wires. Each of the conducting wires is wound to make half a round of an annular or ring-like magnetic substance. One of the conducting wires is wound around a lower half area of the magnetic substance to form one winding while the other conducting wire is wound around an upper half area of the magnetic substance to form another winding. In this manner, the distance between the leader lines can be increased to eliminate parasitic capacitance between the leader lines. The magnetic fluxes generated by current flowing in the two windings are in the same direction. Thus, it is possible to provide an inductor whose total parasitic capacitance is reduced. In other embodiments, additional conducting wires are used.