| 摘要 |
PURPOSE:To prevent a transistor from damaging at the power source applying time to protect it by detecting the prescribed voltage when the voltage rises at the power source energizing time. CONSTITUTION:When the power source of a stepping motor drive circuit is turned ON, transistors Q2, Q3 receive the output of a voltage detector 5 through diodes D1, D2, clamped forcibly to ''L'' level voltage of the detector 5, thereby setting the transistors Q2, Q3 to nonconductive state. When the voltage Vcc reaches the normal voltage, the forcibly clamping state is released, and an operation is executed by the signal from input terminals (a), (b). |
