1小信号处理电路开关电源讲完后,打算讨论变频器里的采样电路了,张老师说:“采样电路必须解决好两件事情:第一件是放大,例如,在测量电流时,采样时是不允许影响被测的电流的。所以,采样所得的信号,常常是十分微弱的,必须进行足够的,而又不失真的放大。第二件是隔离,因为要采样的运行数据在强电回路里,而采样后的处理是在弱电电路里进行的。两者之间必须进行可靠的隔离。 A small signal processing circuit Switching power supply finished, intends to discuss the sampling circuit in the inverter, Zhang said: ”The sampling circuit must be solved two things: The first is to enlarge, for example, in the measurement of current sampling When the current is not allowed to affect the measured, so the sampled signal is often very weak, must be sufficient, but without distortion amplification The second is isolation, because the sampling of the operating data in the strong Electrical circuit, and the sampling process is carried out in the weak circuit. Between the two must be a reliable isolation.