Enable Terminal Voltage Control to Prevent UVLO Test Oscillation
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Solution Overview
Problem
Abnormal signal oscillation during UVLO tests in power supply modules reduces testing efficiency and can cause false triggering in post-stage circuits, primarily due to unstable voltage conditions at the enable terminal.
Innovation Solution
A method involving a voltage detection module, difference calculation module, and control module to detect and increase the voltage of the enable terminal during UVLO tests when the difference value falls below a preset threshold, using a voltage adjustment module such as a voltage divider or switch circuit to stabilize the enable terminal voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UVLO test is performed on power supply module, then testing efficiency is improved, but abnormal signal oscillation occurs causing false triggering
Solution Approach 1:
The patent applies preliminary action by detecting the enable terminal voltage before the UVLO test proceeds and adjusting it in advance if it falls below the threshold. The control module proactively increases the enable terminal voltage to a predetermined value before the test condition is met, preventing the oscillation from occurring in the first place rather than reacting after the problem manifests.
Solution Approach 2:
The patent implements feedback by continuously monitoring the enable terminal voltage during the UVLO test and comparing it with the preset threshold. The control module receives real-time voltage information and automatically adjusts the voltage when it detects that the enable terminal voltage is insufficient, creating a closed-loop control system that maintains signal stability throughout the testing process.
2Reliability
If enable terminal voltage is increased during UVLO test, then signal oscillation is prevented, but additional control circuitry is required
Solution Approach 1:
The patent uses an intermediary approach by introducing a control module that acts as a mediator between the voltage detection system and the power supply module. This control module receives voltage information, makes decisions based on preset thresholds, and executes voltage adjustment through existing circuit elements like resistors or potentiometers, rather than requiring a completely new complex control system.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the enable terminal voltage parameter during the UVLO test based on detected conditions. The system changes the voltage parameter from a fixed value to a dynamically adjustable one, allowing the voltage to be increased to a predetermined value when needed, thereby maintaining signal stability without permanent circuit modifications.
Data Source
AI summary
A method and device for avoiding abnormal signal oscillation in UVLO test, applied to a power supply module, includes: a voltage detection module (301) detecting a voltage of an enable terminal of the power supply module during an under voltage lock out UVLO test; a difference calculation module (302) calculating a difference value between a detected voltage and a voltage trigger threshold of the enable terminal; upon a control module (303) determining that the difference value is below a preset first threshold, the control module increasing the voltage of the enable terminal during UVLO test via a voltage adjustment module. The application of the above solution of the present application can avoid abnormal signal oscillation in UVLO test.