Digital Isolator Low Power Mode Operation
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Solution Overview
Problem
Digital isolators face inefficiencies in power management, as they consume significant power when not actively communicating data between isolated devices, leading to unnecessary energy expenditure in quiescent states.
Innovation Solution
Implementing a multi-mode operation for digital isolators, which includes a low power mode where non-essential circuitry is deactivated or operated at reduced power, allowing the isolator to wake up in response to events or periodically, thereby conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the digital isolator operates in active mode to enable data communication, then data transmission functionality is maintained, but power consumption increases significantly
Solution Approach 1:
The isolator dynamically switches between active mode and low power mode based on communication activity. The mode selection is not static but adapts to real-time operational requirements, enabling the system to optimize power consumption while maintaining data communication capability when needed.
Solution Approach 2:
The isolator employs periodic wake-up cycles where it alternates between sleeping in low power mode and briefly activating to check for communication activity. This periodic action allows the system to consume minimal power during idle periods while ensuring data communication functionality is restored when required.
2Use of energy by moving object
If the digital isolator enters low power mode to reduce energy consumption, then power consumption decreases by 75-95%, but data communication is interrupted
Solution Approach 1:
Before entering low power mode, the isolator performs preliminary actions to ensure smooth transition and maintain reliability. Configuration information is preserved, and wake-up protocols are pre-established so that when communication is needed, the isolator can quickly resume operation without data loss or communication failures.
Solution Approach 2:
The isolator implements feedback mechanisms where it periodically checks for incoming data or communication requests before and during low power mode. This feedback loop ensures that the isolator wakes up at the appropriate moment to maintain communication continuity, balancing power savings with reliable data transmission.
3Speed
If all circuitry remains active to ensure immediate data communication, then communication responsiveness is maintained, but power is wasted in quiescent states
Solution Approach 1:
The isolator's circuitry is segmented into essential components that remain active and non-essential components that can be deactivated. Critical functions such as wake-up detection and configuration memory are kept powered, while data transmission circuitry is powered down during idle periods, achieving both energy efficiency and quick resume capability.
Solution Approach 2:
Different parts of the isolator have different power states simultaneously. Essential circuitry maintains full power for immediate responsiveness, while non-essential circuitry enters low power state to reduce energy consumption. This local differentiation of power quality optimizes both responsiveness and energy efficiency.
Data Source
AI summary
Digital isolators operable in multiple power modes are described. The digital isolators include a low power mode, in which some circuitry of the isolator operates in a lower power state than in other mode(s) of operation or may be deactivated, and in which data communication across the isolator is not permitted. The isolator may wake from the low power mode in response to a detected event or may periodically wake. Circuitry on one side of the isolator may dictate when and how the isolator wakes from a lower power mode.