TRU with Low Input Voltage Boost for 28VDC Aircraft Power Systems

United States military aircraft have increasing demand for 28VDC power required to drive modern avionics, mission equipments, and ordinance systems. Conventional unregulated TRUs are unable to provide a minimum output voltage of 20VDC (minimum was requested by the customer instead of the 18 VDC standard as defined in MIL-STD-704F) when subjected to the input under voltage transients, defined in MIL-STD-704F, in addition to meeting steady state requirements. As the voltage falls below 18 VDC, military aircraft mission equipment may become non-functional or reset when subjected to such an under voltage condition.

Avionic Instruments, LLC has developed a hybrid variant of conventional TRU & regulated TRU that addresses specifically minimum output voltage requirements during input under voltage transients. This type of TRU has been developed specifically for an airplane manufacturer for military applications.