As one of the critical components in aviation power supplies, the switching module is of utmost importance during power debugging. The switching and conducting actions of the module are, in fact, a rather complex process, but we can initially simplify the analysis. For instance, when the power switching module is conducting or off, we consider it as an ideal switch with only two states: on or off.
In the past, testing the characteristics of aviation power sources involved simply measuring static current and voltage with a multimeter and performing complex calculations with a calculator. Today, oscilloscopes have become the preferred power measurement platform for many engineers. Some high-performance oscilloscopes are equipped with power analysis software, simplifying setup and making dynamic measurements more accessible. 36V aviation power, 400Hz variable frequency power, 115/200V power, 27V DC power, 400Hz power, aviation power
In simple terms, the conduction and cutoff of 27V and 28V DC power switch modules require time. Generally, the conduction time of the switch module, ton, is divided into the conduction delay time, td, and the conduction rise time, tr. The cutoff time of the switch module, toff, is divided into the cutoff delay time, tstg (or shutdown storage time), and the cutoff fall time, tf. During an aviation power cycle, due to the need to charge the filtering energy storage capacitor with a large charging current, the load is very heavy. Therefore, most aviation power sources adopt soft-start measures, with a very small duty cycle initially, which then gradually approaches normal. This means that at the beginning, the working voltage is low, then it increases to the normal value. Good aviation power sources have short start-up times, settable timing, and fast dynamic response.
