Method and apparatus for cycle error correction for a power converter device, such as an electronic power inverter

An apparatus usable in a power transformation system that can provide power from an AC source to an AC load, the apparatus comprising:

• a cycle counter to count cycles representative of a frequency associated with power provided to the AC load;
• a first component coupled to the cycle counter to obtain a first value representative of the counted cycles and of a frequency associated with power provided from the AC source;
• a second component coupled to the first component to receive the first value and to determine whether to perform frequency compensation of the power provided to the AC load based on the first value, the second component being coupled to provide a second value indicative of whether to perform the compensation based on the first value;
• said second component comprising first and second threshold levels, the second value provided by the second component indicating that compensation is to be performed if the first value is greater than the first threshold level, the second value provided by the second component indicating that compensation is not to be performed if the first value is less than the second threshold value;
• a third component coupled to the second component and coupleable to the first component to provide a third value to initiate the compensation if the second value indicates that the compensation should be performed, the third value being based at least in part on the first value;
• said third component comprising a fourth component coupleable to the first component to scale the first value to a frequency correction value;
• and
• a fifth component coupled to the fourth component to spread the frequency correction value over a period of time in which the compensation is to be performed.