Reliable high-voltage ignition is crucial for starting plasma discharge in electric propulsion thrusters. However, typical spacecraft power systems only provide low-voltage DC levels. This paper outlines the design and development of a compact ignition power supply using an isolated flyback converter. This converter can generate controlled kilovolt-range pulses from a low-voltage input. The proposed system includes high-frequency MOSFET switching, a custom step-up transformer, rectification and filtering stages, and a closed-loop digital control scheme to ensure stable and repeatable ignition performance. Protection and snubber networks help suppress voltage spikes and improve safety and reliability. Simulation studies and laboratory tests show effective voltage gain, a smaller hardware footprint, and consistent pulse regulation. These results indicate the system’s suitability for laboratory propulsion testing and scalable small-satellite applications.