| 摘要 |
PURPOSE:To control the impressed power of an AC load with a high accuracy by adding a theoretical value which is derived by executing an operation based on a sampling data, to the sampling data as a data of a short portion, in case a data which is sampled actually is short. CONSTITUTION:From the last data Vn of (n) pieces of sampled data V1, V2...Vn, and a data Vn-1 which is before said data by one, its difference DELTAVn is derived, and if its result is positive, the number of times (n) of sampling is brought to increment, and stored in Vn+1. An inclination DELTAVn of a voltage variation of the time of the end of sampling is derived by utilizing a result of sampling which is executed actually, a theoretical instantaneous voltage value by a virtual sampling timing of after the end of the sampling is derived by a calculation, and a sampling data is added until zero crossing of its theoretical value is detected. Each sampling data V1, V2...Vm is brought to a square operation, respectively, its result is added to a register, each average value of adjacent ones of each sampling data is derived, these values are squared, respectively, and its result is added to the register. |
