Wire Bond Isolation Coupling for Electric Field Robust Signals
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Solution Overview
Problem
Electronic isolation systems face challenges in effectively communicating between different power domains without direct electrical connections, as existing isolators like optocouplers and capacitive isolators are susceptible to electric fields, which can interfere with signal transmission and induce undesirable currents.
Innovation Solution
The use of elongated conducting elements with optional shield wires, where a third elongated conducting element acts as a single-ended shield and a fourth elongated conducting element cancels out additional magnetic fields, minimizing the impact of electric fields and enhancing signal robustness through magnetic field cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optocouplers or capacitive isolators are used for signal transmission across isolation material, then signal transmission between different power domains is enabled, but the systems become susceptible to electric field interference and undesirable current induction
Solution Approach 1:
The patent introduces an intermediary magnetic field coupling mechanism between the transmitter and receiver circuits. Instead of direct electric field coupling (capacitive) or light conversion (optical), the invention uses magnetic field induction through elongated conducting elements that generate and detect magnetic fields, serving as a mediator that is inherently less susceptible to electric field interference while enabling signal transmission across the isolation barrier
Solution Approach 2:
The patent replaces the conventional electrical/electromagnetic coupling mechanisms (capacitive or optical) with a magnetic field-based induction system. By substituting the coupling mechanism to rely on magnetic field generation and detection through conducting elements, the system achieves isolation from electric field interference while maintaining signal transmission capability
2Object-affected harmful factors
If shield wires are added to protect from electric fields, then electric field susceptibility is reduced, but device complexity increases
Solution Approach 1:
The patent makes the elongated conducting elements serve multiple functions: they act as both the signal transmission conductors and the magnetic field generation sources. This multi-functionality eliminates the need for separate shield wires, as the magnetic coupling mechanism inherently provides isolation from electric field interference, thus reducing device complexity while maintaining protection
Solution Approach 2:
The patent converts the potential harmful effect of electric field susceptibility into a benefit by using magnetic field induction. Since magnetic fields are less susceptible to electric field interference, the invention leverages this property to achieve inherent shielding without requiring additional protective structures, thus converting a weakness into a strength
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 improves signal transmission reliability by reducing the effects of electric fields on the receiving element, maintaining signal integrity across isolation materials, and enhancing the breakdown voltage in high-voltage systems.
Implementation Method 1
a first elongated conducting element configured to receive a first current from the transmitter circuit so as to generate a magnetic field
Implementation Method 2
a second elongated conducting element positioned adjacent to the first elongated conducting element and configured to detect the magnetic field so as to generate an induced current
Implementation Method 3
a third elongated conducting element configured to shield the second elongated conducting element from an electric field generated from the first elongated conducting element
Data Source
AI summary
An isolation system and isolation device are disclosed. An illustrative isolation device is disclosed to include a transmitter circuit to generate a first current in accordance with a first signal, a first elongated conducting element to generate a magnetic field when the first current flows through the first elongated conducting element, a second elongated conducting element adjacent to the first elongated conducting element so as to receive the magnetic field. The second elongated conducting element is configured to generate an induced current when the magnetic field is received. The receiver circuit is configured to receive the induced current as an input, and configured to generate a reproduced first signal as an output of the receiver circuit.