Galvanic Isolation Circuitry for Low-Power Wakeup
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Solution Overview
Problem
Galvanic isolation in low power states poses challenges as waking up circuitry without using excess power is difficult, potentially leading to premature battery or capacitor drain.
Innovation Solution
The implementation of an apparatus with first and second isolation circuitry and control circuitry, where the control circuitry transitions from a sleep state to a wake state upon receiving a wake signal, and the isolation circuitry provides galvanic isolation using optocouplers, transformers, or digital isolators, allowing for low power wakeup and communication across interfaces like CAN bus or RS-485.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galvanic isolation is implemented using traditional isolation circuitry, then electrical isolation between sections is achieved, but power consumption increases and battery/capacitor drains prematurely
Solution Approach 1:
The system is divided into two electrically isolated sections (primary and secondary) that can operate independently. The low-power wake signal path is segmented from the main communication path, allowing the secondary section to remain in sleep mode while still being able to receive wake signals through the isolated interface without requiring full power consumption.
Solution Approach 2:
An intermediary wake signal path is introduced that can trigger state transitions across the galvanically isolated boundary. This intermediary mechanism allows the secondary section to be awakened by signals from the primary section without requiring continuous power or full operational state, thus maintaining isolation while enabling low-power wake functionality.
2Ease of operation
If the secondary interface remains powered to receive wake signals, then wakeup functionality is enabled, but battery or capacitor drains prematurely
Solution Approach 1:
The secondary interface operates in a periodic manner, alternating between active and sleep states. During normal operation, it remains in low-power sleep mode. When a wake signal is detected through the isolated interface, it transitions to active state to process communications, then returns to sleep mode, creating a periodic operation pattern that reduces overall power consumption while maintaining wakeup capability.
Solution Approach 2:
The secondary section is designed to self-manage its power state based on incoming signals. The wake signal detection mechanism allows the secondary interface to automatically transition from sleep to active state without requiring continuous powering, enabling it to serve itself by detecting when wake signals are present and activating only when necessary.
3Productivity
If the apparatus transitions from sleep state to wake state, then communication can resume, but power consumption increases
Solution Approach 1:
The system dynamically adjusts its operational state based on communication needs. The apparatus can transition between sleep and wake states, and the isolation circuitry dynamically adapts to these state changes. This dynamic operation allows the system to maintain communication capability when needed while minimizing power consumption during idle periods, optimizing the balance between productivity and energy usage.
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
Enables efficient low power wakeup of galvanically isolated circuitry without excessive power consumption, preserving energy in batteries or capacitors and maintaining communication integrity.
Implementation Method 1
The first isolation circuitry may include an optocoupler to provide galvanic isolation
Implementation Method 2
The first isolation circuitry may include a first transformer to provide galvanic isolation
Implementation Method 3
The first isolation circuitry may include a first capacitor to provide galvanic isolation
Data Source
AI summary
Disclosed herein are methods, systems, and devices for providing galvanic isolation and low power wakeup of circuitry. According to one embodiment, an apparatus includes first isolation circuitry, second isolation circuitry, and first control circuitry. The first isolation circuitry includes a first primary interface and a first secondary interface. The first primary interface is galvanically isolated from the first secondary interface. The second isolation circuitry includes a second primary interface and a second secondary interface. The second primary interface is galvanically isolated from the second secondary interface. The first control circuitry is electrically coupled with the first secondary interface and the second secondary interface. The first control circuitry is configured to transition the apparatus from a sleep state to a wake state upon receiving a wake signal and the first isolation circuitry is configured to provide the wake signal to the first control circuitry via the first secondary interface.