Main design measures and methods of power module reliability test

Date：2022-03-31 17:20:27Views：948

The reliability of the power module itself is very important and can be used for power applications of digital or analog loads. But in fact, due to the complexity of the working environment of the power supply system, if there is no reliable system application design, the power supply will eventually fail. Because of its high reliability, small size, high power density and high conversion efficiency, the design of power supply system becomes simpler and simpler, so it is widely used. The following introduces the main design measures and methods of power module reliability. Let's have a look.

Product reliability test includes:

1. Short circuit test

No load short-circuit test (allow the power supply to repeat the test from no-load to short circuit), full load short-circuit test (allow the power supply to run from full load to short circuit) continuous operation test), short-circuit start (allow the power supply to test from short circuit to repeated energization).

2. Switch test

Input the input voltage point of the power supply, the maximum load of the power module, turn off for 15 seconds and work for 5 seconds.

3. Input transient high voltage test

Rated voltage input, use oscilloscope to record the number of high-voltage cycles, the power supply operates at full load, and the superimposed voltage jump continues to operate.

4. Input power supply instability output dynamic load test

The input voltage is adjusted to unstable conversion, and the output is adjusted to maximum load and no-load conversion for continuous operation.

5. Power waveform test

Simulate spike, burr, harmonic voltage input, test power performance and parameters, check components and other questions and answers.

6. Voltage test

Test multiple operating overvoltages to see how the overvoltage affects the equipment.

7. High and low temperature test

Due to abnormal performance parameters of components under high and low temperature conditions, long-term testing may expose hidden dangers of products.

8. Insulation strength test

According to the insulation strength increase value of the product, and continue the test to obtain the limit value and abnormal conditions.

9. Anti interference test

With EFT, the anti-interference voltage is set to different voltage levels, and the anti-interference test is continuously performed.

10. Input low voltage test

Test whether the power supply module has continuous low-voltage input. If it is under voltage for a long time, whether it will affect the performance parameters of the power supply.

Different designs and different uses will affect the reliability of the module. Customers should not only focus on power parameters.

Design measures for high reliability power module include:

1. Anti surge protection circuit

How to design anti surge protection circuit? For different applications, maybe the position of inductor and TVs tube can be adjusted, which can make the system better apply and correctly apply the circuit, so as to better improve EMC performance. Pay attention to the design of two-stage anti surge protection circuit. If it is not used properly, it will be counterproductive.

2. Reduce the amount of design

Correctly controlling the components to the specified value and reducing the number of components can delay the degradation, improve the reliability of components and improve the reliability of power supply.

3. Dual power module design

The output of bidirectional power module shall pay attention to load balance. When designing, pay attention to the main and auxiliary circuits to adjust the output evenly.

4. Component selection

The application of different components will lead to different module performance. For example, ceramic or electrolytic capacitors are usually used for capacitor selection, while tantalum capacitors have long life, high temperature resistance and good performance, but are easy to break through the circuit. Please note that different products are used in different ways.

The reliability of module power supply can be said to reflect the quality of power module manufacturers. Only manufacturers who can develop and produce reliable and high-quality products can grow and develop permanently.

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