Relay Circuit Voltage Glitch Reduction During DUT Testing
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Solution Overview
Problem
The existing relay circuits in electronic testing cause glitches in the voltage output of a power supply when switching between providing voltage input and adaptive voltage scaling feedback to the power supply sense input, leading to overshoot or undershoot adjustments.
Innovation Solution
A relay circuit design that includes a first switch to provide a voltage input or AVS feedback to the power supply sense input in one state, and a second switch to provide the same signals to a resistor in another state, with a path allowing the voltage input to be routed through the resistor during transitions, preventing the power supply sense input from floating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the relay circuit switches between providing AVS feedback and voltage input indication to the power supply sense input, then the DUT can be tested with different voltage conditions, but the power supply sense input floats during transition causing voltage glitches
Solution Approach 1:
A pull-up resistor is introduced as an intermediary component connected to the power supply sense input. This resistor acts as a mediator that maintains a defined voltage level at the sense input during relay transitions, preventing the input from floating and eliminating voltage glitches while allowing the relay to switch between AVS feedback and voltage input indication signals
2Measurement precision
If the relay circuit provides AVS feedback to the power supply sense input, then the power supply can adjust voltage output based on internal DUT voltage, but switching causes the sense input to float and produce overshoot or undershoot
Solution Approach 1:
The pull-up resistor is pre-configured and continuously connected to the power supply sense input before the relay switching occurs. This preliminary arrangement ensures that the sense input always has a defined voltage reference level, preventing floating conditions and voltage glitches during the transition between AVS feedback and other signal modes
Data Source
AI summary
A system includes a power supply configured to adjust a voltage supplied to a device under test (DUT) based on one of an input voltage of the DUT supplied to a power supply sense input of the power supply and a feedback signal indicative of an internal voltage of the DUT supplied to the power supply sense input, and a relay circuit configured to transition between supplying the input voltage to the power supply sense input and supplying the feedback signal to the power supply sense input. When supplying the feedback signal to the power supply sense input, the relay circuit establishes an electrical path between the input voltage and the power supply sense input to prevent the power supply sense input from floating during the transition.