Transient Voltage Suppressor (TVS) for F/A-18 E/F and EA-18G

OUSD (R&E) CRITICAL TECHNOLOGY AREA(S): FutureG; Sustainment The technology within this topic is restricted under the International Traffic in Arms Regulation (ITAR), 22 CFR Parts 120-130, which controls the export and import of defense-related material and services, including export of sensitive technical data, or the Export Administration Regulation (EAR), 15 CFR Parts 730-774, which controls dual use items. Offerors must disclose any proposed use of foreign nationals (FNs), their country(ies) of origin, the type of visa or work permit possessed, and the statement of work (SOW) tasks intended for accomplishment by the FN(s) in accordance with the Announcement. Offerors are advised foreign nationals proposed to perform on this topic may be restricted due to the technical data under US Export Control Laws. OBJECTIVE: Develop a Transient Voltage Suppressor (TVS) that will limit the overvoltages to avionics components to 150 volts root-mean-square (Vrms) maximum, instead of the MIL-STD-704E requirement of 180 Vrms. DESCRIPTION: F/A-18 E/F and EA-18G use MIL-STD-704E Aircraft Electric Power Characteristics, the electrical power interface specification. MIL-STD-704E requires avionics to withstand overvoltage transients to 180 Vrms, but many avionics components were not tested to the 180 Vrms causing reduced avionics reliability. MIL-STD-704E requires avionics to withstand overvoltage transients to 180 Vrms, but many Avionics were not tested to the 180 Vrms transients, and are failing in the fleet as a result. The reason testing was not performed for F/A-18 was because in 1999 when aircraft went into full-rate production, there was no test method for MIL-STD-704E; the test method was not implemented until 2010. The most economical solution per aircraft is to place the TVS on two electrical busses instead of inside 50 avionic boxes. The TVS needs to limit the overvoltages to 150 Vrms maximum instead of the MIL-STD-704E of 180 Vrms requirement. The TVS needs to start limiting when the voltage gets to between 130 140 Vrms, and clamp at a maximum of 150 Vrms. PHASE I: Perform a study to design a TVS that meets F/A 18- E/F and EA-18G capabilities. Use MIL-STD-704E Aircraft Electric Power Characteristics, the electrical power interface specification, as a basis for the design. The Phase I effort will include prototype plans to be developed under Phase II. The TVS needs to limit the overvoltages to a maximum of 150 Vrms instead of the MIL-STD-704E of 180 Vrms requirement. The TVS needs to start limiting when the voltage gets to between 130 140 Vrms, and clamp at a maximum of 150 Vrms. PHASE II: Development of two TVS prototypes that should meet the following test requirements: 1. Joule dissipation at 25 C < 2625 Joules, 2. Joule dissipation on infinite heatsink at TL = 75 C < 2625 Joules, 3. Peak forward surge current, 1025ms single half-sinasoidal wave (bidirectional only) 350 amperes root mean square (Arms), 4. Operating and storage temperature range -55 C to +175 C, 5. Vrms minimum range 130 to maximum range 140, 6. Arms maximum reverse leakage 5 mA to 2 A at Voltage Reverse Working Maximum 108 Vrms, 7. Voltage Reverse Working Leakage of a Vrms 108, 8. Maximum Reverse Surge Current I peak to peak Amps rms 172.9 Ipp, and 9. Maximum Clamping Voltage 150 Vrms at Ipp. Navy Military Standards & Testing: 10. MIL STD 704 Electrical interface, 11. MIL STD 810 needs to be environmentally qualified, 12. MIL STD 461 EMI PHASE III DUAL USE APPLICATIONS: Perform laboratory testing and then install the prototype(s) in an aircraft for an aircraft ground and flight test. Commercial electrical system developers that use the electrical power interface specification can use TVS. Commercial aircraft requires avionics to withstand overvoltage transients to 180 Vrms, but many avionics components were not tested to the 180 Vrms. REFERENCES: Lepkowski, J. and Lepkowski, W. Evaluating TVS protection circuits with SPICE. Power Electronics Technology, 32(1), 44, 2006. https://www.electronicdesign.com/technologies/power/power-supply/power-electronics-systems/article/21188592/evaluating-tvs-protection-circuits-with-spice Digitron Semiconductors. (n.d.). Digitron semiconductors 30KP28A 30KP320CA. Digitron Semiconductors. https://digitroncorp.com/getmedia/76286f69-0dc6-42ce-bc16-cb25c6dd46a3/30KP28A-30KP320CA Davis, N. An introduction to transient voltage suppressors (TVS). All About Circuits, 24 May 2019. https://www.allaboutcircuits.com/technical-articles/transient-voltage-suppressors-tvs-an-introduction/ MIL-STD-704F(1) NOT 3 (w/Change-1): Department of Defense interface standard: Aircraft electric power characteristics (05-DEC-2016). Department of Defense. https://quicksearch.dla.mil/qsSearch.aspx MIL-STD-810H: Department of Defense test method standard: Environmental engineering considerations and laboratory tests (31-JAN-2019). Department of Defense, MIL-STD-810 Working Group. / http://everyspec.com/MIL-STD/MIL-STD-0800-0899/MIL-STD-810H_55998/ MIL-STD-461G: Department of Defense interface standard: Requirements for the control of electromagnetic interference characteristics of subsystems and equipment (11-DEC-2015). Department of Defense, MIL-STD-461 Working Group. http://everyspec.com/MIL-STD/MIL-STD-0300-0499/MIL-STD-461G_53571/ Wiring aerospace vehicle AS50881 SAE International. https://www.sae.org/standards/content/as50881h/ MIL-E-7016F: Electric load and power source capacity, aircraft, analysis of (24-JUL-2019). Department of Defense. https://quicksearch.dla.mil/qsDocDetails.aspx?ident_number=6249 Naval Air Systems Command. (1998). MIL-W-5088 Rev. L(1) NOT 2: Military specification: Wiring, aerospace vehicle. Department of Defense. https://quicksearch.dla.mil/qsSearch.aspx KEYWORDS: Electrical; transient; voltage; suppressor; avionics; MIL-STD-704