I understand that:
For purely DC current with fixed DC voltage, the DC & RMS current value will be the same, means that the total power RMS & DC will be the same using Pdc = Idc x Vdc
For pulsed current with fixed DC voltage (example flyback switching), RMS current value will be greater than DC current value, however the RMS will be not count in for power consumption, therefore the power consumption is still based on Pdc = Idc x Vdc
Based on that, meaning that in every calculation, I need to use DC current for power calculation, not RMS value.
By using simulation, I managed to get RMS & average value at my flyback secondary side. Both value are correct based on my calculation. Refer image below:
- How to convert RMS current to average current? I noticed that most of power supply calculation will produce RMS current (example secondary RMS current, not secondary average current). Most of the time, I will use Pdc/Vout to get the average current, but how can I estimate the average current from the RMS current?
- How can I measure this average current in actual condition? I noticed that most of my equipment (example oscilloscope, multi-meter) is based on RMS value & not average value.
- What is the actual purpose of this RMS current value? When do we use this RMS value in real situation?