Backflow Prevention Circuit With Cut-Off Control for Chip Power Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current technologies fail to effectively prevent current backflow between chips when one is powered off, leading to power waste and potential damage due to abnormal current reception.
Innovation Solution
A circuit comprising a signal connection terminal, power input terminal, internal power supply terminal, electrostatic protection circuit, first switch element, and cut-off control circuit is implemented, where the cut-off control circuit controls the first switch element to break the electrical connection between the power pad and internal power supply terminal when a leakage current or signal is detected, preventing current backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the signal pad is electrically connected to the P-type field-effect transistor inside the chip, then signal transmission is enabled, but current backflow occurs when one chip is powered off
Solution Approach 1:
The patent applies the dynamics principle by making the electrical connection between the power pad and internal power supply terminal controllable rather than fixed. A switch element is introduced that can dynamically change its state between connected and disconnected based on the power status of communicating chips. When one chip is powered off, the switch element on the powered-on chip opens to prevent current backflow, while maintaining signal transmission capability when both chips are powered on.
2Loss of energy
If the switch element is added to control power connection, then current backflow is prevented, but device complexity increases
Solution Approach 1:
The patent applies the self-service principle by designing a control circuit that automatically detects the power status of communicating chips and autonomously controls the switch element without requiring external intervention. The control circuit monitors voltage levels or power state signals and independently decides when to open or close the switch, making the system self-regulating and reducing the need for additional complex control mechanisms.
3Reliability
If the control circuit continuously monitors power status, then current backflow is effectively prevented, but power consumption increases
Solution Approach 1:
The patent applies the periodic action principle by implementing a control circuit that periodically or event-drivenly checks power status rather than continuously monitoring. The control circuit can detect power state changes through voltage threshold detection or power good signals, activating the switch element only when necessary. This reduces the power consumption of the control circuit while maintaining reliable current backflow prevention functionality.
Data Source
AI summary
A circuit for preventing current backflow includes: a signal connection terminal, a power input terminal, an internal power supply terminal, an electrostatic protection circuit, a first switch element and a cut-off control circuit. The electrostatic protection circuit is coupled to the signal connection terminal and the internal power supply terminal. The first switch element is coupled between the power input terminal and the internal power supply terminal. The cut-off control circuit is coupled to the signal connection terminal, the power input terminal and the first switch element. The cut-off control circuit controls the switching of the first switch element according to a voltage of the signal connection terminal and a voltage of the power input terminal.