Power Module Testing via Simultaneous Waveform Capture
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Solution Overview
Problem
The existing methods for testing power modules are complex and inefficient, requiring separate processes for sequence, voltage overshoot, and voltage undershoot tests.
Innovation Solution
A method that connects the power module to a load meter and an oscilloscope, allowing for simultaneous capture and analysis of power-on and power-off waveforms under different load states to determine sequence, overshoot, and undershoot performance, simplifying the testing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequence test, voltage overshoot test, and voltage undershoot test are performed separately, then each test can be conducted with dedicated setup, but the entire test process becomes complicated and test efficiency is low
Solution Approach 1:
The patent combines sequence test, voltage overshoot test, and voltage undershoot test into a single integrated testing process. By connecting the power module to a load meter and oscilloscope once, all three test types are performed simultaneously through automated control, eliminating the need for separate dedicated setups for each test while maintaining measurement accuracy through the oscilloscope's multi-channel capability
Solution Approach 2:
The testing system is designed with multi-functionality to perform sequence testing, voltage overshoot detection, and voltage undershoot detection using the same hardware configuration. The oscilloscope captures multiple signal channels (input voltage, output voltage, enable signal) simultaneously, and the control device automatically executes different test sequences, making the system universal for all three test types
2Reliability
If separate testing processes are used for sequence, voltage overshoot, and voltage undershoot tests, then each test can be optimized independently, but the test process complexity increases
Solution Approach 1:
The patent merges multiple test processes into a single integrated workflow where the control device automatically manages sequence testing, overshoot detection, and undershoot detection. The oscilloscope captures all necessary waveforms in one operation, and the system automatically analyzes results according to predetermined criteria, reducing procedural complexity while maintaining comprehensive test coverage
Solution Approach 2:
The testing system incorporates automatic judgment and analysis functions where the control device self-evaluates test results by comparing captured waveforms against predetermined standards. The system automatically determines pass/fail status for sequence, overshoot, and undershoot tests without requiring manual intervention, thereby simplifying the overall test process while ensuring reliable results
Data Source
AI summary
A method for testing a power module includes connecting an output capacitor of the power module to a load meter; inputting an input signal, an enable signal, a PowerGood signal, and an output signal of the power module to first, second, third, and fourth channels of an oscillometer, respectively; adjusting the load meter to a no-load state, and capturing and storing the power-on waveforms and power-off waveforms of four channels of signals of the power module; adjusting the load meter to a full-load state, and capturing and storing the power-on waveforms and power-off waveforms of the four channels of signals of the power module; and determining whether the power-on sequence, power-off sequence, overshoot voltage value, and undershoot voltage value of the power module are normal based on the power-on waveforms and power-off waveforms of the four channels of signals stored by the load meter under the no-load and full-load states.