The primary inverter driving circuit,current foldback circuit,protection circuits for overheat and lowvoltage circuit are introduced specially.

重点介绍了一次逆变的驱动电路及过流、过热、过压保护电路。

To control stepping motors, the balance bridge power drive circuit is made up by TDA1521 integrated audio power amplifier, the pulse allotter is made up by the parallel ports of computer and latches.

双回转机构的步进电机控制电路由TDA1521音频集成功率放大器组成平衡桥式功率驱动电路，由计算机并行口经过锁存器构成脉冲分配器。