Signal transmission device and drive device

A signal transmission device is provided with: a pulse generator, a RS F/F circuit and a detector, the generator generates a set pulse signal and/or a reset pulse signal when a state of a PWM signal is changed. After the generation of the set pulse signal, the generator continuously generates following pulse signals after elapse of a predetermined period of time counted from the generation of theset pulse signal. The generator adjusts, based on a selector signal, the predetermined period of time counted to a time when the following pulse signal is transmitted at a first time. The detector detects the state of the selector signal based on the predetermined period of time counted from a time when the RS F/F circuit receives the set pulse signal or the reset pulse signal to a time when receiving the following pulse signal at a first time. 一种信号传输设备，具有脉冲发生器、RS F/F电路和检测器，当PWM信号的状态改变时，发生器产生置位脉冲信号和/或复位脉冲信号。在产生置位脉冲信号之后，发生器在经过从产生置位脉冲信号算起的预定时间周期之后连续地产生下一脉冲信号。发生器根据选择器信号对算到首次传输下一脉冲信号的时间的预定时间周期进行调节。检测器基于从RS F/F电路接收到置位脉冲信号或