| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To quickly remove a phase difference between the output voltage of a power supply and that of a commercial power source, with no abrupt change of cycle of the output voltage of power supply. <P>SOLUTION: When a phase difference judging means 13 detects an initial phase differenceθ<SB>0</SB>between an output voltage of a power supply 11 and that of an AC power source 1, a cycle shift amount control means 14 gradually increases a cycle shift amount (T-T<SB>0</SB>) from cycle T<SB>0</SB>of the output voltage of the AC power source 1 until a phase differenceθbetween the output voltage of power supply 11 and that of the AC power source 1 comes to beθ<SB>0</SB>/2, and gradually decreases the cycle shift amount (T-T<SB>0</SB>) from the cycle T<SB>0</SB>of the output voltage of AC power source 1 until the phase differenceθfrom the output voltage of AC power source 1 comes to be zero. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
