Angle tracking device of rotating transformer

The invention provides an angle tracking device of a rotating transformer. The angle tracking device of the rotating transformer comprises an AD (analog/digital) sampling module, a synchronous rectification module, a CORDIC (coordinated rotation digital computer) angle calculating unit and a PI (proportional and integral) adjuster. The CORDIC angle calculating unit receives two rectified voltage signals E1 and E2 as the signal input of a rotating angle a and receives the angle signal theta output by the PI adjuster to calculate the value of Msin (a-theta) as the input of the PI adjuster and to form a PI closed loop control system with the PI adjuster. The angle tracking device of the rotating transformer has the advantage of being high in angle converting precision.