
2. The Multiple Frequency Problem
Several strategies exist to deal with the multiple frequency problem:
- Divide and Conquer - Use a DC Input
- Circuit is now a DC/DC converter
- Can run POP/AC
- Choose your frequencies to be harmonic multiples (limited to fixed frequency converters)
- e.g. 100kHz switching frequency and 50Hz line frequency
- You can POP on 50Hz, and the 100kHz appears as a 2000th harmonic!
- Brute force it - Multi-Tone AC Analysis
- Inject multiple time-domain sinusoidal frequencies into the loop
- Extract the frequency response with Fourier techniques