Ramp-Detected Level Shifter for Fast Transient Voltage Tolerance
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Solution Overview
Problem
Level shifters face challenges in accommodating voltage transients in high voltage domains, which can cause damage or alter functionality, and existing designs often trade off between low current consumption and transient performance, limiting compatibility between components operating in different voltage domains.
Innovation Solution
A level-shifting circuit with a ramp detector that monitors the slew rate of the voltage source, using current chokes to limit quiescent current when transients are within limits and bypassing these chokes to increase transient response when transients exceed a threshold, ensuring voltage tolerance and reduced current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If current chokes are used to limit quiescent current, then current consumption is reduced, but transient response capability deteriorates
Solution Approach 1:
The patent applies dynamics by making the current path configurable between two states: normally using current chokes to limit quiescent current, but dynamically switching to bypass paths (via switch elements) when transient conditions are detected. This allows the system to adapt its current consumption characteristics based on operational requirements, resolving the contradiction between low current consumption and fast transient response.
Solution Approach 2:
The ramp detector acts as an intermediary that monitors voltage slew rate and triggers the switching mechanism. When voltage transients exceed a threshold, the ramp detector activates switch elements to bypass current chokes, enabling fast transient response while maintaining low quiescent current during normal operation. This intermediary component enables the system to automatically select the appropriate current path based on real-time conditions.
2Adaptability or versatility
If voltage tolerance is increased to accommodate transients, then component compatibility improves, but circuit complexity increases
Solution Approach 1:
The switch elements act as intermediaries between different current paths, enabling the circuit to accommodate voltage transients by dynamically reconfiguring the current flow. This allows the level shifter to maintain compatibility across different voltage domains without permanently increasing circuit complexity, as the additional components are only activated when needed for transient handling.
Solution Approach 2:
The patent changes the operational parameters of the circuit by switching between different current paths based on detected voltage conditions. When transients are detected, the circuit parameter (current path resistance) is changed by bypassing current chokes, allowing the circuit to adapt to different voltage domains and transient conditions without permanent structural modification.
3Reliability
If fast transient response is implemented, then voltage transient mitigation improves, but quiescent current consumption increases
Solution Approach 1:
The circuit dynamically switches between low-current mode (using current chokes) and fast-response mode (bypassing current chokes via switch elements). The ramp detector monitors voltage slew rate and triggers the dynamic reconfiguration only when transients are detected, ensuring fast transient mitigation capability while maintaining low quiescent current consumption during normal operation.
Solution Approach 2:
The circuit employs periodic monitoring of voltage slew rate by the ramp detector, which continuously checks for transient conditions and activates the fast-response path only when needed. This periodic detection and conditional activation ensures that the high-current fast-response path is used only during transient events, minimizing overall current consumption while maintaining reliability.
Data Source
AI summary
In an example, an apparatus includes a level-shifting circuit and a ramp detector. The level-shifting circuit has a current choke and a transistor coupled across the current choke, the level-shifting circuit adapted to be coupled to a first voltage source. The ramp detector has a ramp detector input adapted to be coupled to the first voltage source and a ramp detector output coupled to the transistor, the ramp detector adapted to be coupled to a second voltage source.