| 摘要 |
<p>PURPOSE:To hold the safety of this circuit by inserting an EX-OR gate to a pair of PWM signals. CONSTITUTION:While defining a pair of PWM signals A and B as one couple to a pair of power transistors 6 and 7, conduction starting time is delayed through a common counter 3b having an EX-OR gate 3a at the input. There after, the respective power transistors 6 and 7 are driven separately for respective signals A' and B' by AND gates 3e and 3f. Therefore, even when a pair of signal inputs are simultaneously turned on by any noise, a pair of power transistors 6 and 7 are simultaneously turned off. Thus, the circuit can be kept safe and reliability can be improved.</p> |
