High-impedance autotransformer

The utility model relates to the technical field of power electronic equipment. The utility model aims to provide a high-impedance autotransformer. The power supply requirement of the gas discharge lamp with high starting voltage and high working voltage at the two ends of the lamp tube after continuous light emitting can be met, the functions that the initial value of the output voltage is high and stable, and the output voltage can be reduced along with increase of load current are achieved, and the gas discharge lamp has the advantages of being small in size, light in weight, simple in structure and low in manufacturing cost. The transformer comprises an upper iron yoke, a lower iron yoke, two main iron core columns and an auxiliary iron core column, each auxiliary iron core column is not wound with a coil, each main iron core column is wound with a coil, one coil is connected to a power supply, and the other coil is connected to a load after being connected with the previous coil in series; air gaps are n