Wide-range multi-gear adjustable user transformer capable of boosting and reducing voltage

The invention relates to the technical field of user transformer equipment, and provides a wide-range multi-gear adjustable user transformer capable of boosting and reducing voltage. The user transformer comprises a protective shell, wherein a transformer self-coupling copper wire coil is arranged in the protective shell; the transformer self-coupling copper wire coil comprises an annular magneticcore; and a pure copper winding is wound on the annular magnetic core. The user transformer equipment of the invention overcomes defects in the prior art, is reasonable in design and compact in structure, and solves the problems that an existing voltage stabilizer is difficult to adjust ultra-wide-range low and high voltages and thus causes unusability and high loss or even damage of an electricappliance; through a simple structural combination, input voltage can be conveniently checked by arranging a voltage display screen, then copper wire connectors with different turn ratios are switchedthrough a phase change swi