Edge-Triggered Digital Isolator Circuitry for High-Speed Power Domains
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Solution Overview
Problem
As electronic devices integrate multiple systems with different power domains, safely interfacing between these domains becomes challenging, especially at high transmission speeds, leading to potential circuit damage and increased power consumption.
Innovation Solution
Implementing edge-triggered digital isolator circuitry that uses rising and falling edges of digital data streams to transmit data across an isolation barrier, employing transmitter and receiver channel circuitry with capacitors and inductors to generate and detect voltage ripples, and reconstruction circuitry to validate the data stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional level-triggered isolator circuitry is used to interface between different power domains, then data transmission can be achieved, but power consumption increases and circuit damage risk increases at high transmission speeds
Solution Approach 1:
The patent employs edge-triggered periodic action where data transmission occurs only at rising or falling edges of the clock signal rather than continuously. The transmitter captures data on one edge (e.g., rising) and the receiver reconstructs it on the opposite edge (e.g., falling), creating periodic transmission windows that reduce power consumption while maintaining reliability at high speeds
Solution Approach 2:
The patent replaces traditional level-triggered mechanical switching with edge-triggered electromagnetic induction through isolation transformers. The transformers couple transmitter and receiver circuits magnetically across isolation barriers, eliminating direct electrical connections that cause power consumption and damage risks while maintaining data transmission integrity
2Reliability
If traditional isolator circuitry is used for data transmission across isolation barriers, then data can be transmitted between power domains, but the complexity and cost of the circuitry increases
Solution Approach 1:
The patent extracts only the essential edge-detection functionality from complex traditional isolators. By using simple capacitors to detect voltage edges and isolation transformers for magnetic coupling, the design removes unnecessary circuit complexity while maintaining reliable data transmission across isolation barriers between different power domains
Solution Approach 2:
The isolation transformers serve multiple functions simultaneously: they provide galvanic isolation between power domains, enable magnetic coupling for signal transmission, and facilitate edge-triggered operation. This multi-functionality reduces overall circuit complexity compared to dedicated components for each function
3Productivity
If high transmission speeds are used to improve productivity, then data transmission rate increases, but the risk of circuit damage and power consumption increases
Solution Approach 1:
The patent introduces isolation transformers as intermediary devices between transmitter and receiver circuits. These transformers provide galvanic isolation that blocks harmful voltage spikes and power domain interference while allowing magnetic coupling of data signals, enabling high-speed transmission without circuit damage risk
Solution Approach 2:
The edge-triggered periodic transmission mechanism limits high-speed data transmission to specific clock edges only, preventing continuous high-frequency switching that would generate harmful electromagnetic interference and power consumption, while still achieving high productivity through efficient use of transmission windows
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 reduces power consumption and cost while ensuring reliable data transmission between different power domains, minimizing circuit damage and maintaining data integrity.
Implementation Method 1
a capacitor having a first terminal and a second terminal, the first terminal of the capacitor coupled to the output of the buffer; an isolation transformer including: a first inductor having a terminal coupled to the second terminal of the capacitor
Implementation Method 2
a second inductor magnetically coupled to the first inductor across an isolation barrier
Data Source
AI summary
An example apparatus includes: transmitter channel circuitry including: a buffer having an output; and a capacitor having a first terminal and a second terminal, the first terminal of the capacitor coupled to the output of the buffer; an isolation transformer including: a first inductor having a terminal coupled to the second terminal of the capacitor; and a second inductor magnetically coupled to the first inductor across an isolation barrier, and receiver channel circuitry coupled to the second inductor.