综合波发生电路的设计及其参数选取

Design of Combined Wave Generator by Using Universal Variable Method

为解决电力及电子设备的电磁兼容性能检测中常用的综合波发生电路设计相对较难的问题,介绍了一种利用通用变量法设计的基本思路。着重探讨了两种常用电路结构的参数选取,并得到了电路参数与波头波尾的相互变化趋势曲线和影响波头波尾变化的关键参数:电感器件主要影响波头参数、电容和电阻器件对波头波尾参数均有影响。运用此法设计电路产生的波形满足相关的IEC标准,实例证明了方法的可靠性和准确性。

The impulse wave generator was constructed for evaluation of the electromagnetic compatibility （EMC） of electronic and electrical devices. In the process of test, a combined wave generator is regularly used which can generate not only certain voltage waves, but also certain current waves. However, the design of this circuit is relatively difficult. This paper describes a method to design the combined wave generator. The method introduces two universal variables used to calculate the modulus decays and frequency of the wave, then gets the circuit parameters by calculation. It can be briefly expressed as, waveform parameters are ultilized to specify universal variables, which can be used to define the parameters of different circuit elements. The paper also discusses how to select the parameters in two usually adopted circuits. Moreover, the relationships between the parameters of the circuit and wave front and tail are pointed out. At last, the predominate factors which can greatly change the front and tall are found out： the induetors always influence front and the capacitors and resistors influence both front and tail. By the simulation with the Pspice software and the experiments of several impulse circuits, the method is demonstrated to be credible Conclusions are drawn that, with this method, the selection of generator parameters turns out to be more reasonable and efficient. The method to design a combined wave generator conforms to relative IEC standard, which means the method can be applied for design.