Different Types of Transformer Rectifiers

A transformer rectifier unit (TRU) is an electronic device that contains thyristors or diodes within the same tank and aids in voltage regulation. Additionally, transformer rectifiers are used to convert alternating current (AC) into direct current (DC) through a process called rectification. As transformer rectifiers are complex instruments, this blog will cover some of their basic features, working principles, and various types.

When it comes to a transformer rectifier’s most important features, the list is expansive. With this in mind, this section will provide a brief overview of their most prominent attributes. Firstly, they consist of a GPS interface that serves as a current interpreter, SCADA for remote controlling and monitoring, remote monitoring via a GSM data logger, and remote controlling/monitoring via PLC. Transformer rectifiers also incorporate different kinds of selection controls like VARIAC or Tap, constant current, current-voltage, and auto reference.

A transformer rectifier joins the transformer and rectifier functions into a single unit. Other forms of the transformer rectifier units include selenium oxide, mercury arc valves, silicon-based and semiconductor diodes. Beyond converting AC to DC and using this current as a power source, they can also detect radio signals as well as heat in the case of a fire. Moreover, their ability to regulate voltage is sourced from the no-load tap changer (NLTC) located in the high voltage region. Regulation can be obtained with the use of saturable reactors in the secondary region. Additionally, transformer rectifiers produce an extremely polarized voltage which is required for welding. In cases like this, the power supply is essential to control the circuit's output current. This is done by utilizing a bridge rectifier to restore the diodes. A bridge rectifier has the ability to carry voltage by using relays.

An example of a common application for a transformer rectifier is seen within the battery of a car. The TRU in the battery uses 240 VAC and changes it into 14 VDC for battery charging. The transformer does this by taking the voltage from AC to an equilibrated state and then converting it into DC through the use of a bridge rectifier.

There are various types of TRUs, each defined by their input and output supply. First, an AC operated TRU contains a three-phase or single-phase input supply coupled with an output supply of up to 100V DC and 1200 Amps DC. Next, a DC operated CPPSM unit has an input supply of up to 48V DC paired with an output supply of up to 50V DC and 50 Amps DC. Lastly, an AC/DC operated rectifier unit contains a single-phase or three-phase input supply of up to 48V DC and an output supply of up to 50V DC and 50 Amps DC. With such wide ranges in input and output supply, TRUs are used in a number of applications including business aircraft, military aircraft, helicopters used for commercial purposes, and more. As such, sourcing high quality TRUs should be of the utmost importance.

If you find yourself in need of transformer rectifier units, diodes, connector parts, or other specialized industrial components, look no further than Just NSN Parts for all of your operational needs. Just NSN Parts is a leading distributor of aerospace, aviation, and NSN parts. As an AS9120B, ISO 9001:2015, and FAA AC 00-56B certified and accredited enterprise, you can always depend on the quality of our items. To get started with the procurement process today, fill out and submit the RFQ form as provided below, and a dedicated representative will reach out to you with a quote for your comparisons. Give us a call or email us at sales@justnsnparts.com and we thank you for choosing Just NSN Parts as your go-to sourcing solution.


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