What are the components that affect the service life of PC power supplies?

How to increase the life of the PC Power supply! Usually, the retention time of the PC power supply is not a power-off protection mechanism in the strict sense, but a measure to ensure that the power-off protection mechanism can be implemented. It is the hardware or the whole set that really works The platform’s own power-off protection measures.

How to increase the life of the PC power supply! Usually, the retention time of the PC power supply is not a power-off protection mechanism in the strict sense, but a measure to ensure that the power-off protection mechanism can be implemented. It is the hardware or the whole set that really works The platform’s own power-off protection measures.

It is not just one or two components that determine the retention time of the PC power supply, but is related to the structure, materials and even workmanship of the power supply. However, when it comes to which part has a greater impact, it is naturally in the power supply. The main capacitor is out. In addition to filtering the high-voltage side, the main capacitor of the power supply can also store energy. After the current input is lost, it will still maintain external discharge for a certain period of time to ensure the normal operation of the subsequent circuit, so increase the main capacitor The capacity can effectively improve the holding time of the power supply.

What are the components that affect the service life of PC power supplies?

However, the capacity of the main capacitor is not as large as possible. The larger the capacity of the capacitor, the larger the volume and the longer the charging time, which will have a greater impact on the subsequent adjustment of the circuit. Therefore, the power supply with rated power and the main capacitor with large capacity need to be calculated.

The XFX XT 500 power supply with dual-tube forward architecture is equipped with a 330μF main capacitor

Taking the current common power architectures such as dual-tube forward, LLC resonance, etc., generally 0.5μF/W can basically ensure that the hold time of the power supply can reach the standard, that is, the PC power supply with a rated 500W, the main capacitance should not be less than 250μF. In order to ensure a more adequate retention time, manufacturers will also leave more margins when designing the power supply. Among them, the power supply with dual-tube forward architecture is more sensitive to the capacity of the main capacitor, so the capacity of the main capacitor will be affected. Higher, most 500W power supplies will be equipped with 330μF main capacitors, while power supplies with LLC resonant architecture require relatively looser requirements. Also, 330μF capacitors can achieve a rated power of 550W.

The flagship XFX XTi 850 power supply configuration has two main capacitors with an equivalent capacity of 940μF

In the flagship PC power supply, the ratio of the main capacitance to the rated power will be larger, and most of them are close to or even exceed the ratio of 1:1. Take XFX XTi 850 power supply as an example. Its rated power is 850W, but it is equipped with two 470μF main capacitors, and the equivalent capacity is 940μF. It can be said that the margin left is very sufficient.

The Links:   LM32019P SKM200GB12V