As one of the critical components in aviation power supplies, the switch module is also a top priority in power debugging. The switching action of the switch module, which involves turning off and on, is actually a complex process, but we can initially simplify it. For instance, when the power switch module conducts or cuts off, we can consider it as an ideal switch with only two states: on or off.
In the past, to test the characteristics of aviation power sources, we were limited to measuring static current and voltage with a multimeter and performing complex calculations with a calculator. Today, the oscilloscope has become the preferred power measurement platform for many engineers. Some high-performance oscilloscopes are equipped with power analysis software, simplifying the setup and making dynamic measurements more straightforward. Aviation ground power, 36V aviation power, 400Hz variable frequency power, 115/200V power, 27V DC power, 400Hz power, aviation power
In simpler terms, the conduction and interruption of 27V and 28V DC power switch modules both 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), while the switching time off (toff) is divided into the turn-off delay time (tstg, or shutdown storage time) and the turn-off fall time (tf). In an aviation power supply cycle, due to the need to charge the filtering energy storage capacitors with a high output voltage, the charging current is significant, and the load is heavy. Therefore, general aviation power supplies must implement soft start measures, starting with a very low duty cycle, then gradually approaching normal. That is, the working voltage is relatively low at first, then it rises to the normal value. Good aviation power supplies have short startup times, which can be set.
