Princeton Power will develop and deliver three small, lightweight 50 W high-voltage power supplies that have a configurable output voltage range from 500 to 50 kVDC. The baseline 1 kV design will have 85% efficiency, operate from a 20-30 VDC supply, occupy 108 mL (460W/liter), and weigh 200 g. The design will use an innovative resonant DC-DC boost converter with simple controls and a robust passive switching technique. Our patented AC-link power electronics technology configured in a soft-switching DC-DC design enables the use of a small internal transformer and 100 kHz switching frequency, to make a power-dense, reliable, efficient system. The configurable transformer ratio and modular output section permit a wide range of output voltages. The project risk is minimal due to our reference prototypes, which have demonstrated high-voltage DC-DC conversion, high-frequency switching, and thermal management in power-dense, sealed packages. During Phase I we will deliver a prototype unit, including a detailed design analysis and production cost estimate. In Phase II we will optimize the design to become space-qualified for shock, vibration, interface, EMI, form factor, and other relevant specifications. For our Phase III manufacturing efforts, GHO Ventures is interested in providing funding and Transistor Devices (TDI) has expressed interest in providing manufacturing facilities and expertise.