What items are included in the integrity test of the power module?

The integrity test of the power module is a key link to ensure the stable and reliable operation of the power module system. Its test items cover many core indicators from input to output, static to dynamic, performance to reliability. The specific test items are as follows:

Power test items

Input voltage range

Verify the normal working ability of the power supply within the rated input voltage and the allowable fluctuation range, including overvoltage/undervoltage protection threshold test.

Input current and surge current

Steady-state input current test to evaluate power supply efficiency; surge current test to ensure the reliability of input filtering and rectification circuits.

Input ripple and noise

Measure the ripple voltage and noise of the input power supply to avoid grid interference affecting power supply performance.

Output voltage accuracy

The deviation between the actual output voltage and the nominal value verifies the stability of the voltage stabilization circuit.

Power supply test software

Load adjustment rate

When the load changes from no load to full load, the fluctuation amplitude of the output voltage reflects the load carrying capacity of the power supply.

Source adjustment rate

When the input voltage changes, the stability of the output voltage measures the power supply's ability to suppress input fluctuations.

Output ripple and noise

The low-frequency ripple and high-frequency noise at the output end must be controlled within the load allowable range.

Cross-regulation rate

When the load of one of the multiple output groups changes, the voltage of other outputs fluctuates to evaluate the coupling effect of the winding and feedback circuit.

Load transient response

When the load changes suddenly, the overshoot, undershoot amplitude and recovery time of the output voltage reflect the dynamic regulation ability of the power supply.

Power module test items

Startup/shutdown characteristics

Startup time, rising edge slope, overshoot voltage; discharge characteristics and voltage drop curve when shutting down to avoid surge impact load.

Frequency response and loop stability

Control loop bandwidth, phase margin and gain margin test to ensure that the power supply does not oscillate under different loads.

Efficiency test

Energy conversion efficiency under different load conditions to evaluate the energy consumption and heat generation level of the power supply.

Temperature rise and heat distribution

When running at full load for a long time, the temperature changes of the power device and the casing to ensure that it does not exceed the safety threshold and verify the effectiveness of the heat dissipation design.

Overload protection

When the load exceeds the rated value, whether the power supply triggers current limiting or shuts down, and whether it can automatically recover after the fault is eliminated.

Overvoltage protection

When the output voltage rises abnormally, whether the output is quickly cut off to protect the subsequent circuit.

Overcurrent protection

Response mechanism when the input or output current exceeds the threshold.

Short circuit protection

When the output is short-circuited, whether the power supply enters hiccup mode or locks to avoid device damage.

Power supply test system

Overtemperature protection

Automatic derating or shutdown function when the internal temperature is too high, whether it can work normally after the temperature recovers.

Conducted disturbance

Conducted noise at the input/output end.

Radiated disturbance

Radiated noise of the power supply housing and cables, evaluates the impact of electromagnetic radiation on peripheral equipment.

Harmonic current

Harmonic component of input current.

Electromagnetic immunity

The ability to resist interference such as static electricity, electric fast pulse groups, surges, etc., to verify the stability of the power supply in harsh electromagnetic environments.

Power timing control

In a multi-power system, whether the power-on/off sequence and delay time of each voltage rail meet the design requirements to avoid logical confusion.

Synchronization and current sharing

The current sharing characteristics of parallel power supplies, synchronous clock or phase consistency, ensure the stable operation of redundant systems.

Aging test

Long-term full-load operation, screening of early failure products, and verification of long-term stability.

Life prediction and stress testing

Life evaluation of key components, failure mode analysis under extreme conditions such as high temperature/high pressure/overload.

Environmental tolerance

Performance changes in high and low temperature, humidity, vibration/shock and other environments.