Voltage Controlled Current Path for Voltage Clamp Protection
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Solution Overview
Problem
Circuit components sensitive to specific voltage ranges can be damaged by power supply rails operating in higher voltage domains, leading to voltage excursions that can cause destruction or operational disruptions.
Innovation Solution
A voltage-controlled current path is implemented, comprising a first stage that conducts current when the input voltage exceeds a threshold, with a second stage providing a controlled current path to limit voltage excursions at a protected node, using a combination of transistors and current mirrors to manage current flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power supply rails operate in a high voltage range to provide sufficient power, then power delivery capability is improved, but sensitive circuit components may be damaged by voltage excursions
Solution Approach 1:
The patent introduces a voltage clamp circuit as an intermediary protective layer between the high-voltage power supply rails and the sensitive circuit components. This mediator actively monitors voltage at the protected node and activates a current path to clamp voltage excursions when thresholds are exceeded, thereby isolating sensitive components from harmful high voltage while allowing the power supply to operate in its optimal high-voltage range
Solution Approach 2:
The voltage clamp circuit is designed to automatically activate and protect the circuit without external intervention. The first stage detects voltage excursions self-autonomously and triggers the second stage to establish a current path that clamps the voltage, enabling the system to protect itself from voltage damage while maintaining normal operation within safe voltage ranges
2Reliability
If a voltage clamp circuit is added to protect sensitive components, then component safety is improved, but circuit complexity increases
Solution Approach 1:
The voltage clamp circuit is segmented into two distinct functional stages: a first stage that detects voltage excursions and a second stage that establishes the current path for clamping. This segmentation allows each stage to be optimized for its specific function and enables modular integration into the existing circuit, reducing the perceived complexity while maintaining comprehensive protection capability
Solution Approach 2:
The patent merges the voltage detection and current path control functions into a single integrated voltage clamp circuit that operates seamlessly with the existing power supply and circuit components. By combining these functions and utilizing existing circuit nodes and elements where possible, the overall circuit complexity is minimized while achieving effective voltage protection
Data Source
AI summary
According to a first aspect of this disclosure there is provided a voltage controlled current path. The voltage controlled current path comprises a first stage arranged to conduct current once the voltage at an input node of the first stage exceeds a threshold value. The amount of current that passes through the first stage is a function of the voltage at the input node. A second stage is arranged to pass a current that is a function of the current passing through the first stage.