The invention relates to a single-phase dry type converter
transformer for suppressing a polysilicon. The single-phase dry type converter
transformer comprises an iron core, not less than two low-
voltage winding input units, an electrostatic shielding layer, a low-
voltage winding with not less than one tap and a high-
voltage winding with not less than one lap, wherein the low-voltage winding is provided with n taps and n+1 tap positions, each tap position is controlled by a two-way
silicon controlled
rectifier, and output voltage of
high voltage is controlled by adjusting the low-voltage tap position; the high-voltage winding is provided with m taps and m+1 tap positions, and the tap position of the output voltage of the
high voltage can become the (n+1)*(m+1) tap position to be output by adjusting the low-voltage tap position; an isolating switch is closed, and the on-off control of each line of the two-way
silicon controlled
rectifier is controlled; and every type of the output voltage can be finely adjusted on the basis of the (n+1)*(m+1) types of the output voltage by controlling the conduction angle of each line of the two-way
silicon controlled
rectifier of the low-voltage winding input units. The single-phase dry type converter
transformer for suppressing the polysilicon has the advantages of simple structure, reliability in operation and good performance, and the
voltage regulation way is simple and easy to implement.