Winding-Type Coil Component Symmetrical Terminal Layout
Solution Overview
Problem
The existing winding-type coil components used in direct-current superimposing circuits convert differential signals into common-mode noise, leading to signal degradation and unnecessary noise emission due to asymmetrical inductances and complex wiring patterns.
Innovation Solution
A winding-type coil component with two windings of equal turns wound around a core, where the terminal electrodes are symmetrically placed to reduce inductance differences and prevent mode conversion, simplifying the circuit layout and reducing noise emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of turns of the first winding is larger than that of the second winding by 0.5, then the inductances of the two windings become asymmetrical, but this causes high degree of mode conversion and unnecessary noise emission
Solution Approach 1:
The patent applies asymmetry in reverse - it deliberately creates a symmetrical structure where both windings have exactly the same number of turns (N1 = N2 = N). This symmetry ensures that the inductances are equal (L1 = L2), preventing mode conversion and noise emission. The terminal electrode arrangements are also made symmetrical with respect to the winding core axis, further ensuring balanced inductance characteristics.
2Ease of manufacture
If terminal electrodes are formed apart from each other on side surfaces of flange portions, then electrical connections are established, but this creates complex wiring patterns and routing difficulties
Solution Approach 1:
The patent uses symmetrical arrangement of terminal electrodes on the end surface of the flange portion, positioned symmetrically with respect to the winding core axis. This symmetrical configuration simplifies the wiring patterns by creating balanced routing paths and reduces the complexity of circuit board layout, while still maintaining proper electrical connections for the windings.
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 effectively suppresses the conversion of differential signals into common-mode noise, maintaining signal quality and simplifying the routing of wiring patterns in direct-current superimposing circuits.
Implementation Method 1
a first winding having one end portion connected to the first terminal electrode and the other end portion connected to the second terminal electrode, and a second winding having one end portion connected to the third terminal electrode and the other end portion connected to the fourth terminal electrode. The first winding and the second winding are wound around the winding core
Data Source
AI summary
A direct-current superimposing circuit includes differential signal lines, capacitors, a common mode choke coil, a winding-type coil component, and a DC power supply which are disposed at a circuit board. The winding-type coil component includes a core, two pairs of terminal electrodes, and two windings (a first winding and a second winding). On the end surface of a flange portion, the terminal electrodes in one of the two pairs and the terminal electrodes in the other one of the two pairs are placed to face each other across the winding center of a winding core. The winding start and winding end of the first winding are connected to the terminal electrodes in one of the two pairs. The winding start and winding end of the second winding are connected to the terminal electrodes in the other one of the two pairs.