I have a circuit that steps up a 30KHz sine wave from 12 to 240 volts. I would like to compare its input current with the maximum that can be drawn on the output. A variable ceramic resistor would be used as the load.
My idea was to make two of the circuits below, place one on the input, one on the output, and view both channels on an oscilloscope in subtraction mode.
Is this a sound approach?
What is the preferred calculation for equating the secondary's higher voltage, lower current output with the input current?
Robert Miller