Transformer Isolator Coil Layout for Higher Q and Signal Coupling
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Solution Overview
Problem
Existing isolators face challenges in efficiently transmitting signals between transmission-side and reception-side circuits while maintaining isolation, due to limitations in power efficiency and magnetic flux coupling.
Innovation Solution
The isolator employs a dual wiring structure for both the primary and secondary coils, with wirings coupled in parallel between pads, to reduce combined resistance and enhance the Q value, thereby improving power efficiency and magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single wiring structure is used for the coils, then the device complexity is reduced, but the resistance increases and Q value decreases, leading to poor power efficiency
Solution Approach 1:
The patent combines multiple wirings (first and second wirings for the primary coil, third and fourth wirings for the secondary coil) in parallel to reduce the total resistance of each coil. This merging of parallel conductive paths directly improves power efficiency by reducing resistive losses while maintaining a relatively simple overall device structure through integrated coil assembly
2Reliability
If wirings are coupled in series, then the device complexity is reduced, but the combined resistance increases, reducing the Q value and magnetic coupling efficiency
Solution Approach 1:
The patent merges multiple wiring segments in parallel configurations within each coil assembly. The first and second wirings are coupled in parallel for the primary coil, and the third and fourth wirings are coupled in parallel for the secondary coil. This parallel merging reduces combined resistance and enhances the Q value, thereby improving magnetic coupling efficiency between the coils
3Use of energy by moving object
If the Q value of the coils is increased, then power efficiency is improved, but this requires complex parallel wiring structures that increase device complexity
Solution Approach 1:
The patent merges multiple wiring paths in parallel within each coil to reduce resistance and increase the Q value. By integrating these parallel wiring structures into a unified coil assembly with standardized pads and terminals, the design achieves high Q values and power efficiency without proportionally increasing overall device complexity
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 increases the Q value of the coils, enhances power efficiency of the transformer, and prevents magnetic flux cancellation, leading to improved signal transmission efficiency and expanded frequency band.
Implementation Method 1
an isolator configured to transmit a signal from a transmission-side circuit to a reception-side circuit while they are isolated from each other
Implementation Method 2
The first coil includes a first wiring and a second wiring. The first coil is coupled to the first pad and the second pad. The second coil includes a third wiring and a fourth wiring. The second coil is arranged to face the first coil with the insulating layer intervening between the second coil and the first coil. The third wiring and the fourth wiring are coupled in parallel to each other between the third pad and the fourth pad.
Data Source
AI summary
According to one embodiment, an isolator includes a first pad, a second pad, a first coil, an insulating layer, a third pad, a fourth pad, and a second coil. The first coil includes a first wiring and a second wiring. The first coil is coupled to the first pad and the second pad. The second coil includes a third wiring and a fourth wiring. The second coil is arranged to face the first coil with the insulating layer intervening therebetween. The second coil is coupled to the third pad and the fourth pad. The first wiring and the second wiring are coupled in parallel to each other between the first pad and the second pad. The third wiring and the fourth wiring are coupled in parallel to each other between the third pad and the fourth pad.