What is the Load Test Method for Switching Power Supply?

The on-load test of a switching power supply is a test used to evaluate the performance and stability of a switching power supply. 

By simulating real load conditions, testers can determine the output voltage, current and power parameters of the switching power supply under different loads to verify whether its design meets the requirements.

Switching power supply load test methods can be selected according to different test requirements and standards. 

How do you test a power supply load regulation?

Several common test methods are described below:

1. Proportionally adjust the load

The method by constantly adjusting the size of the load resistance, so that the output current of the power supply in accordance with the predetermined proportion gradually increased. 

By recording the voltage and current values under different loads, the output characteristic curve of switching power supply can be drawn. 

What are the advantages of scaling load testing?

This method is very helpful for evaluating the stability and load capacity of the switching power supply.

2. Transient response test

This test method is used to evaluate the response speed and stability of the switching power supply when the load changes. By changing the load of the switching power supply suddenly, the transient response of the output voltage of the power supply is observed. 

What are the different types of load mutation test?

In general, the load mutation test has three ways: short circuit, open circuit and positive load jump. 

This test method is very important for evaluating the transient response performance of switching power supply.

3. Efficiency test

The efficiency of the switching power supply is an important performance indicator, affecting its energy consumption and thermal management. 

How do you test the efficiency of a power supply?

Efficiency testing is done by measuring the power input and output of the switching power supply, and then calculating the conversion efficiency of the power supply. 

This test method can help to evaluate the power utilization of the switching power supply and the efficiency change under different load conditions.

4. Peak power test

The switching power supply usually needs to provide additional power for a certain period of time to cope with the peak demand when the device is started. 

Peak power testing ensures that the switching power supply can steadily output additional power for a short period of time. 

The test method is generally to increase the load in a specific period of time, and record the output voltage and current waveform of the switching power supply.

5. Temperature test

The temperature of the switching power supply has a great impact on its performance and life. 

Temperature testing can be done by running the switching power supply under load conditions for a long time and recording the temperature change of the power supply. 

This test method can evaluate the thermal design of the switching power supply and its stability at high temperatures.

Precautions*

When carrying out the on-load test of the switching power supply, it is also necessary to pay attention to some test details and points.

Such as the temperature and humidity of the test environment to be controlled within the appropriate range, the test equipment and instruments to be accurate and reliable, the test process needs to continue for a period of time to ensure reliable results and the recording and analysis of test data.

In conclusion

On-load test of switching power supply is a key step to evaluate the performance and stability of switching power supply. 

Accurate and reliable test results can be obtained through reasonable selection of test methods and attention to test details, which provides strong support for the design and application of switching power supply.