| 摘要 |
PURPOSE:To obtain a synchronized uninterruptible power supply which is not subjected to fluctuation of voltage level or distortion of voltage waveform of AC power supply being used. CONSTITUTION:An AC primary power supply voltage having appropriate level is fed to a full-wave rectifying circuit 10 outputted therefrom is then differentiated through first and second differentiating circuits 11, 12 constituted of resistors and capacitors thus producing a waveform exhibiting the phase at a zero-cross point of commercial power supply voltage waveform. Thus produced waveform is then shaped through a shaper circuit 13 to produce a pulse signal which is fed, as a timing pulse signal, to an uninterruptible power supply circuit thus realizing an uninterruptible power supply synchronized with the AC power supply. |
