检测电路接收第二时钟讯号和第一集成电路芯片所输出的第一时钟讯号，以产生一比较讯号。
The test circuit receives the second clock signal and the first clock signal outputted by the first IC chip to generate a comparable signal.
同时，采用专用芯片SG3525来产生脉宽调制电路，由IR2110组成的驱动电路来驱动绝缘门极双极晶体管（IGBT）。
Special chips, such as SG3525 and IR2110 are also used to generate PWM and to drive the IGBT.
本文利用最常见的用于电源的PWM电压调节芯片TL494，设计成直流电机调速控制电路。
This paper makes use of ordinary power supply chip TL494, which having characteristic of PWM output, DC motor speed-varying control circuit has been designed.
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