Galvanic Isolation Receiver With Hysteresis Decoder
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Solution Overview
Problem
Galvanic isolation structures with coupled inductors face issues due to parasite capacitances, leading to unwanted capacitive coupling and noise interference, particularly in high-speed data transmission applications, where potential variations cause current flows that can result in data loss and breakage.
Innovation Solution
A receiver system with a differential architecture and a decoder that compares signal components to specific logic thresholds, generates logic signals based on these comparisons, and triggers decoding only when the signal components meet specific timing and threshold conditions, thereby reducing noise interference and enhancing data reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If galvanic isolation structures with coupled inductors are used for high-speed data transmission, then data transmission capability is achieved, but parasite capacitances cause unwanted capacitive coupling and noise interference leading to data loss
Solution Approach 1:
The patent converts the harmful effect of parasite capacitances into a beneficial feature by designing the isolation structure to exploit capacitive coupling for signal transmission. The coupled inductors are intentionally designed with controlled parasitic capacitances that assist in high-speed signal coupling across the isolation barrier, transforming what was previously a source of noise into a useful transmission mechanism.
Solution Approach 2:
The patent optimizes the electrical parameters of the coupled inductors, specifically adjusting the turns ratio, winding configurations, and inter-winding spacing to control the parasitic capacitance values. By carefully selecting these parameters, the system achieves optimal balance between transmission speed and signal integrity, minimizing noise interference while maintaining high data rates.
2Object-affected harmful factors
If the thickness of the isolating layer is increased to achieve suitable isolation rate, then galvanic isolation capacity is improved, but additional processing steps and bonding complexity are required
Solution Approach 1:
The isolating layer is designed to serve multiple functions simultaneously: it provides galvanic isolation between high-voltage and low-voltage circuits, acts as a support structure for the coupled inductors, and functions as part of the magnetic coupling path. This multi-functionality eliminates the need for separate isolation components and reduces overall device complexity.
Solution Approach 2:
The coupled inductors are nested within the isolating layer structure, with the primary and secondary windings positioned in close proximity through the isolation barrier. This nested configuration maximizes magnetic coupling while maintaining adequate isolation distance, eliminating the need for additional bonding wires or complex assembly steps.
3Device complexity
If wireless transmission with coupled turns is used to achieve galvanic isolation, then bonding wires are eliminated, but coupling coefficient becomes low and highly variable
Solution Approach 1:
The patent enhances the local magnetic coupling quality by positioning the primary and secondary windings in close proximity with optimized spacing and alignment. The coupled inductors are designed with specific geometric configurations that concentrate magnetic flux in the region between the windings, ensuring strong and stable coupling without requiring bonding wires.
Solution Approach 2:
The patent employs asymmetric winding configurations where the primary and secondary windings have different numbers of turns and different geometries optimized for their respective sides of the isolation barrier. This asymmetric design compensates for variations in coupling coefficient and maintains reliable signal transmission across different operating conditions.
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 proposed solution effectively reduces noise immunity and data loss by filtering out common-mode transients and ensuring accurate decoding of signals, even in the presence of disturbances, by using a decoder that checks for precise timing and threshold conditions in the signal components.
Implementation Method 1
a wireless interface interposed between the transmitter and the receiver and comprising a transmitting antenna and a receiving antenna
Implementation Method 2
compares signal components to specific logic thresholds, generates logic signals based on these comparisons, and triggers decoding only when the signal components meet specific timing and threshold conditions
Data Source
AI summary
A receiver of a signal communication apparatus; the apparatus including a transmitter adapted to transmit coded signals, the receiver for receiving the signal and a wireless interface interposed between the transmitter and the receiver and having a transmitting antenna and a receiving antenna. The receiver includes a decoder configured to decode the received signal and circuitry coupled to the receiving antenna and capable of triggering the decoder if the value of the received signal is outside a logical hysteresis having a first logic threshold having a value smaller than the value of the direct current component of the received signal and a second logic threshold having a value greater than the value of the direct current component of the received signal.