PLL DEVICE AND METHOD OF FREQUENCY INSTRUMENTATION USING FOR PHASE LOCK LOOP TECHNIQUE

摘要

The present invention relates to a frequency measuring apparatus and method using the PLL technique, and a method of measuring frequency using the PLL technique of the present invention includes: determining whether a set interrupt has occurred; Reading a digital phase voltage value of three phases when the set interrupt is generated; Converting each of the read digital phase voltage values into a voltage value of a rotational coordinate system which is a voltage value of two phases; Performing DQ conversion using the converted two-phase voltage value; And sampling the DQ conversion a predetermined number of times to detect the current angle and the current frequency.