摘要
作为电机驱动系统中的控制指令载体,PWM波的信号完整性影响整个系统的可靠性和任务完成能力,但是国内外的相关研究报道却很少。为了提高PWM波在传输过程中的信号完整性,设计了一种新型PWM波的故障保护与诊断电路。其通过将DSP输出的PWM波与经过驱动芯片处理后的信号进行一系列逻辑操作,并利用硬件电路设定判定阈值,若两波形不符合度大于设定阈值则禁止PWM波的输出。试验证明,当PWM波在传输过程中发生突变或较大延迟时,该电路能够及时诊断出故障,并将故障部分进行隔离,起到了保护功率器件的作用,提高了电机驱动系统的可靠性。
As a command carrier of the motor-driven system,signal integrity of PWM has impacts on reliability and ability to fulfill tasks for the whole system.However,there few research report at home and abroad.A new-type circuit of fault protection and diagnosis is proposed for improving the signal integrity of PWM during transmission.A series of logical operations are to deal with PWM from DSP and signals modulated by drivers in this circuit.And decision thresholds are set up by hardware circuits,the PWM output is inhibited when non-coincidence value between the two signals is larger than decision thresholds.It is verified by experiments that,this circuit can be able to diagnose faults in time,and parts of fault can be insulated,if a sudden change or big delay occurs during PWM transmission.So that it plays a protective role for power devices,and the reliability of the motor-driven system is improved.
出处
《电子测量技术》
2015年第9期125-127,134,共4页
Electronic Measurement Technology
