Research on Self-excited Power Control System of Helicon Plasma Electric Propulsion

This paper puts forward a kind of self-excited RF power control system, which is more suitable for helicon plasma electric propulsion system than traditional RF generator based on a servo motor. Simple structure makes it smaller and lighter. It has no moving parts, and so that can be easily transformed into aerospace products. This system achieves the goal of impedance matching by using phase lock loop to trace load frequency. A verification circuit is designed, and the results prove that the design is feasible.