| 摘要 |
PURPOSE:To detect the firing timing accurately without delay by detecting only at the start of firing through an input detection circuit on the basis of an input signal having required level converted through a shaper circuit while detecting pulse series signals through a mono-stable multivibrator. CONSTITUTION:Every time when a voltage signal V1 concerning to the firing function is applied onto an input terminal 28, firing timing signal SO constituted with stable pulse series having constant pulse width is detected without lagging from occurrence of said signal V1. In the function of firing timing detector, the circuit 21 will function as a mono-stable multivibrator to set the referential time Ta for determining the pulse width of each pulse SOP in said firing timing signal SO. Consequently even for variation of rotation from low to high, the pulse width of said signal SO is always constant. Even if the voltage signal V1 to be provided to the input terminal 28 is a high voltage signal, it is converted through the shaping circuit 19 to the required level and never causes delay. |
