Galvanic Isolation Signal Transmission Using Multi-Transition Pulse Encoding
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Solution Overview
Problem
Existing communication systems across galvanic isolation using inductive coupling face challenges in maintaining effective data transmission due to weak magnetic coupling and noisy environments, particularly in power conversion systems where low inductance and high noise levels hinder reliable signal representation and reception.
Innovation Solution
The use of a pulse generator that represents logical states with multiple upward and downward transitions, extending the duration of state representations and incorporating a state discriminator circuit to differentiate between various multi-pulse state representations, thereby improving robustness and reliability of data transmission across galvanic isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inductive coupling is used to communicate across galvanic isolation, then electrical isolation is maintained, but magnetic coupling strength is insufficient leading to noisy signal transmission
Solution Approach 1:
The patent applies periodic action by using multiple upward and downward transitions within each logical state representation. Instead of a single pulse, each logical state is represented by a sequence of periodic transitions, which extends the duration of state representation and improves signal detectability against noise while maintaining galvanic isolation through the inductive coupling.
2Reliability
If multiple upward and downward transitions are used to represent logical states, then state representation duration is extended improving reliability, but power consumption increases
Solution Approach 1:
The patent applies partial or excessive action by using multiple transitions (excessive) to represent each logical state, which improves reliability. The receiver includes a state discriminator circuit that can differentiate between various multi-pulse state representations, allowing the system to use more transitions than a simple single-pulse system would require, thereby improving signal detection reliability while managing power consumption through optimized transition sequences.
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 approach enhances data transmission reliability and robustness by maintaining signal induction in the receiving inductor for a longer period, optimizing power consumption, and reducing noise interference, ensuring effective communication in noisy power conversion environments.
Implementation Method 1
a varying current flowing through a transmitting conductor induces a varying voltage across the ends of a receiving conductor
Implementation Method 2
The pulse generator generates a transmit signal comprising a sequence of upward and downward transitions, wherein each upward transition generates a voltage pulse having a first polarity and each downward transition generates a voltage pulse having a second polarity
Data Source
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Figure 3A
AI summary
A signal transmission system for communicating across galvanic isolation. The signal transmission system includes first circuitry referenced to a first potential, the first circuitry comprising signal transmission circuitry, second circuitry referenced to a second potential and galvanically isolated from the first circuitry, the second circuitry comprising signal reception circuitry, and a magnetic coupling between the first circuitry to the second circuitry across the galvanic isolation, the magnetic coupling comprising a transmitter-side inductor and a receiver-side inductor. The signal transmission circuitry can include a source coupled to output, to the transmitter-side inductor of the magnetic coupling, a first state representation that represents a first logic state with multiple transitions, the first state representation including at least a first upward transition, a first downward transition, a second upward transition, and a second downward transition.