Isolation Circuit Logic for Stable Signals During Power-Down
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Solution Overview
Problem
In low power consumption technologies, isolation circuits fail to maintain signals in a stable state during power transitions, leading to unstable operations and potential malfunctions in normally open voltage domains due to sudden external power failures.
Innovation Solution
An isolation circuit system comprising a power management unit, digital logic circuit, and isolation circuit that processes signals to stabilize voltage interactions, using first and second signals to manage power down states and prevent unstable signal propagation to other domains, with optional microprocessor control for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microprocessor actively initiates power down to control the isolation circuit, then the signal from power-down area can be stabilized, but the response time is delayed and abnormal operations may occur
Solution Approach 1:
The isolation circuit is configured to automatically activate when detecting a power down event in the first circuit area, without requiring microprocessor intervention. This preliminary automatic action eliminates the time delay associated with microprocessor processing and signal stabilization, while ensuring the isolation function is immediately activated to prevent abnormal operations in the second circuit area.
2Ease of operation
If the isolation circuit uses microprocessor control for signal stabilization, then signal control can be achieved, but the system complexity increases
Solution Approach 1:
The isolation circuit is designed with automatic detection and activation capabilities, monitoring power down events in the first circuit area and activating isolation functions autonomously. This self-service mechanism eliminates the need for microprocessor control logic, reducing system complexity while maintaining effective signal control between voltage domains.
3Device complexity
If the power-down area signal is not isolated timely, then the circuit operation can be simple, but abnormal wake-up and maloperation may occur
Solution Approach 1:
The isolation circuit proactively activates before power down events can cause maloperation or abnormal wake-up in the second circuit area. By detecting power down conditions in the first circuit area and immediately establishing isolation, the system prevents harmful effects from propagating, ensuring operational stability without adding complex control mechanisms.
Data Source
AI summary
Isolation circuit system and a signal isolation method thereof. The system includes: a power management unit, configured to output a first signal to a digital logic circuit when power down is detected in a first circuit area, and output a second signal to the digital logic circuit when no power down is detected in the first circuit area; the digital logic circuit, configured to perform logical processing on the first signal received from the power management unit before outputting an isolation signal to the isolation circuit, and perform logical processing on the second signal received from the power management unit before outputting a connection signal to the isolation circuit; and the isolation circuit, configured to block the interactive signal, or to output the interactive signal to a second circuit area after the interactive signal is processed through voltage stabilization.