| 摘要 |
PURPOSE:To eliminate the simultaneous turn-on of two switching means and to prevent the short circuits of both switching means by constructing a 3-terminal switch with the series connection of both switching means and using a transformer to drive the 3-terminal switch in the directly opposite direction. CONSTITUTION:A drive signal is inputted to a winding wire 4a to apply the bias voltage opposite to each other to the transistors TR 2 and 3 which construct the switching means. If the turn-off action of the TR 2 is delayed when the ON/OFF states are switched between both TR 2 and 3 with inversion of the drive signal, a diode 5 short-circuits both ends of a winding wire 4d and therefore the inversion of the drive signal is prevented. As a result, the bias voltage is not supplied to the TR 3 before the TR 2 is turned off and therefore the TR 3 is never turned on. When the TR 2 is turned on, the drive signal is inverted and the TR 3 is turned on. Thus both TR 2 and 3 are never turned on at one time and the short circuits of them can be prevented. |
