Why is the input of power module not positive or negative? Do you know why that is? If you don't know, xiaobian today to give you a brief chat. First of all, let's look at alternating current. What is alternating current? The current, whose magnitude and direction change periodically over time, is neither positive nor negative because the direction of alternating current changes. But there are fire lines and zero lines. So what are the positive and negative electrodes? Direct current (dc).

Alternating current is called AC, and direct current is called DC, and when you look at these two letters, you know what they mean.

For the electronic equipment using the power module, as the ac-DC power module has the function of rectifier bridge inside, the rectifier bridge can realize the input end without either positive or negative. And most AC-DC power modules support both AC and DC, but there is an input range, generally AC85~265V or DC100~370V. The function of the rectifier bridge is to convert the alternating current whose level is floating up and down at zero point to the unidirectional direct current through the single guide of the diode, which is needed when people want to change the alternating current to direct current.

Now you know why the input to the power module is not positive or negative.