Transmission Interface Noise Reduction via Opposing Loop Currents
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Solution Overview
Problem
Existing transmission interfaces using electromagnetic induction are prone to noise interference from external magnetic fields and internal device interactions, leading to instability in signal transmission, particularly in densely packed chip-based systems where space reduction is desired.
Innovation Solution
A transmission interface design featuring sub-winding units and wire units with opposing loop currents and magnetic fields to cancel out noise currents and electromagnetic interference, implemented on integrated circuits with circular or spiral layouts for efficient electromagnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large induction area is used for electromagnetic signal transmission, then signal transmission capability is improved, but susceptibility to external magnetic field interference and electromagnetic interference to other circuits increases
Solution Approach 1:
The patent introduces shield winding units that generate counter-directional magnetic fields to cancel out external magnetic field interference. The harmful external magnetic field is converted into a beneficial cancellation effect by inducing opposite-direction currents in the shield windings, which generate compensating magnetic fields that neutralize the interference.
Solution Approach 2:
The shield winding units act as intermediary elements between the signal transmission windings and the external magnetic environment. These intermediate windings receive external magnetic field interference and transform it into counter-directional currents that generate shielding magnetic fields, protecting the main signal transmission path.
2Object-affected harmful factors
If a mask is used to block noise interference, then electromagnetic interference protection is improved, but product size increases due to occupied space
Solution Approach 1:
The patent extracts the noise shielding function from a separate physical mask component and integrates it directly into the circuit board layout through shield winding units. This extraction eliminates the need for additional external shielding structures, reducing overall product size while maintaining interference protection.
Solution Approach 2:
The shielding function is merged with the circuit board structure itself through the shield winding units. The shield windings are integrated into the same circuit board layer or adjacent layers, combining the functions of signal transmission and electromagnetic shielding in a single integrated structure, thereby reducing product size.
3Area of stationary object
If transmission interface is manufactured on a chip to reduce induction area, then product size is reduced, but interference from other devices on the same chip increases
Solution Approach 1:
The patent applies the same counter-directional current principle to shield against internal interference from other chip devices. The shield winding units generate magnetic fields that cancel out interference from neighboring devices on the same chip, converting the harmful internal electromagnetic environment into a protected transmission path.
4Reliability
If sub-winding units with opposing currents are used, then noise current reduction is improved, but device complexity increases
Solution Approach 1:
The patent merges the signal transmission function and noise shielding function into a single integrated circuit structure. The shield winding units are implemented using the same PCB trace technology as the signal windings, combining multiple functions in one unified design rather than requiring separate components.
Solution Approach 2:
The shield winding units serve multiple functions simultaneously: they provide electromagnetic shielding, generate counter-directional currents to cancel noise, and can be integrated with existing PCB manufacturing processes. This multi-functionality reduces the need for additional specialized components, managing 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 design effectively reduces net noise currents and electromagnetic interference, enhancing signal transmission stability while minimizing space occupancy, suitable for applications like flyback power converter circuits.
Implementation Method 1
the first sub-winding unit and the second sub-winding unit are electromagnetically coupled to each other, so that the transmission interface transmits the signal by means of electromagnetic induction between the first sub-winding unit and the second sub-winding unit
Implementation Method 2
a first forward magnetic field is generated along a first forward direction, whereas, a first backward magnetic field is generated along a first backward direction, the first forward direction being opposite to the first backward direction, so as to reduce a first net electromagnetic interference (EMI) generated at the first circuit
Data Source
AI summary
A transmission interface with noise reduction function includes a first circuit and a second circuit, for transmitting a signal from the first circuit to the second circuit or from the second circuit to the first circuit. The first circuit includes a first sub-winding and a first wire unit, and the second circuit includes a second sub-winding and a second wire unit. When an electromagnetic noise passes through the first sub-winding and the first wire unit, two loop currents are respectively generated, and the currents have opposite directions to cancel each other so as to reduce the electromagnetic noise. Or, when an emitting current corresponding to the signal flows through the first sub-winding and the first wire unit, two magnetic fields are respectively generated, and the magnetic fields have opposite directions to cancel each other so as to reduce the electromagnetic interference.