Why might someone use a Transformer-rectifier unit (TRU) instead of a simple rectifier?

Using a Transformer-rectifier unit (TRU) is advantageous because it not only converts alternating current (AC) to direct current (DC) but also adjusts the voltage level during the process. This function is essential in many applications, especially in aviation and computing environments where specific voltage levels are required for various systems. The TRU’s ability to transform voltage ensures that the output DC has the correct specifications for the equipment being powered, safeguarding the functionality and longevity of sensitive electronic components.

In contrast, a simple rectifier does not have the capacity to modify the voltage level; it merely converts AC to DC. This limitation can lead to issues if the voltage requirements of the end devices are not met, potentially causing performance problems or requiring additional circuitry to manage voltage levels.

Moreover, the ability to precisely control output voltage enhances system efficiency and reliability, which is particularly critical in applications demanding high performance and safety, thereby underscoring the importance of using a TRU over a basic rectifier.