| 摘要 |
PURPOSE:To prevent the leakage of primary winding side drive pulse to the secondary winding side by keeping the potential of the start of each winding constant so as to allow the end of each winding to describe a puls waveform the same in amplitude and phase when a control signal is specified and the output of an isolation transformer is turned on, where three windings are subject to filter winding for the same number of turns. CONSTITUTION:When a control signal S is at a level 'H', a winding start potential (d) of the primary winding n1 is Vcc, a winding start potential (e) of the secondary winding n2 is VBE and a winding start potential (f) of the ternary winding n3 is the secondary side reference potential, they keep a constant potential respectively and the winding end potential, they keep a constant potential respectively and the winding and potential of the windings n1-n3 is changed by the same amplitude 2VBE+VE and the same phase as shown in the figure. This means that the potential at an optional point from the start to the end of wach winding changes in the same amplitude and same phase and then no electric charge is transferred between in-line capacitor of each winding. That is, the noise current is not leaked because of the transfer drive pulse from the primary to the secondary side in the pulse transformer 2 and no high frequency noise is caused. |
