Power Envelope Control Using Dissipation Feedback in SMUs
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Solution Overview
Problem
Source measure units (SMUs) often require over-designed cooling due to worst-case sinkmode power dissipation, leading to inefficient use of resources and slow thermal monitoring, especially since sinkmode is less frequently used than sourcemode.
Innovation Solution
A power envelope controller that uses voltage and current feedback signals to generate a power dissipation signal, compares it to thresholds, and adjusts the amplification stage's power dissipation through a summing block and priority switching to optimize power usage in both source and sinkmode operations, allowing for reduced power consumption and safer operating areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cooling is designed for worst-case sinkmode power dissipation, then reliability is improved, but device complexity and resource efficiency deteriorate
Solution Approach 1:
The patent implements dynamic power envelope control that adjusts cooling requirements based on real-time operating conditions. The system transitions from static worst-case design to dynamic adaptation by continuously monitoring power dissipation and adjusting the power envelope accordingly, allowing the cooling system to be optimized for actual rather than theoretical maximum conditions.
Solution Approach 2:
The patent changes the parameter being controlled from fixed worst-case power dissipation to dynamically calculated power dissipation based on feedback signals. By modifying the power envelope parameters in real-time based on actual operating conditions, the system avoids over-designing cooling for sinkmode while maintaining reliability when needed.
2Device complexity
If thermal monitoring is performed in the background, then device complexity is reduced, but speed of detection deteriorates
Solution Approach 1:
The patent implements a feedback-based power envelope control system that continuously monitors power dissipation through voltage and current feedback signals. This active feedback mechanism provides real-time detection of power conditions, enabling fast response to thermal situations without requiring complex background monitoring systems.
Solution Approach 2:
The patent replaces mechanical/background thermal monitoring with an electrical feedback-based detection system. By using voltage and current feedback signals processed through analog multipliers and comparators, the system achieves fast thermal detection through electrical measurements rather than slower thermal sensing methods.
3Reliability
If power envelope is restricted for safety, then reliability is improved, but productivity deteriorates
Solution Approach 1:
The patent implements dynamic power envelope adjustment that adapts safety limits based on real-time conditions rather than applying static restrictions. The system calculates power dissipation dynamically and adjusts the power envelope accordingly, allowing maximum safe power utilization in each operating condition rather than applying conservative fixed limits.
Solution Approach 2:
The patent changes power envelope parameters dynamically based on feedback signals and operating conditions. By adjusting voltage and current limits in real-time based on calculated power dissipation, the system maximizes safe power delivery without arbitrary restrictions, improving productivity while maintaining reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables more efficient power management, reducing overheating risks and providing access to previously disabled regions of the power envelope, optimizing cooling needs and improving operational safety in SMUs by dynamically adjusting power dissipation based on real-time feedback.
Implementation Method 1
An analog multiplier is configured to generate an internal power dissipation signal representing the internal power dissipation of the amplification stage based on the voltage and current feedback signals
Implementation Method 2
A comparator circuit is configured to compare the power dissipation signal to a power threshold and generate a power control error signal when the internal power dissipation of the amplification stage exceeds the threshold
Implementation Method 3
The voltage feedback input circuitry may include a polarity switch configured to change a polarity of the voltage feedback signal based on the current flow direction. The current feedback input circuitry may also include a polarity switch configured to change a polarity of the current feedback signal based on the current flow direction.
Data Source
AI summary
A power envelope controller configured for use with an amplification stage and method are disclosed. The power envelope controller includes voltage feedback input circuitry configured to receive a voltage feedback signal representing an internal voltage drop across the amplification stage and current feedback input circuitry configured to receive a current feedback signal representing an output current of the amplification stage. An analog multiplier is configured to generate an internal power dissipation signal representing the internal power dissipation of the amplification stage based on the voltage and current feedback signals. A comparator circuit is configured to compare the internal power dissipation signal to a power threshold and generate a power control error signal when the internal power dissipation of the amplification stage exceeds the threshold.