| 摘要 |
PURPOSE: To reduce the time error of a load in an inverter for supplying power to the load including at least an AC electric clock by switching to an auxiliary power source or in parallel with the auxiliary power source. CONSTITUTION: A frequency divider 11a divides in frequency the reference frequency pulse of a reference frequency circuit 8, a synchronizing pulse generator 10 generates the pulse synchronized with the frequency of an inverter 1, a frequency divider 11b divides in frequency it and inputs it to a frequency corrector 12. The corrector 12 compares both the pulses at every predetermined time, measures the time error of a load, increases the frequency of the inverter 1 by a correction time TON corresponding to the error by the preset correction frequency ΔF from the reference frequency if the error is a lag or controls to correct the error by reducing it by ΔF if the error is lead. |
