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According to this document which talks about how to do the power-sharing and power limits, these three figures are the power limit circuit, and I have three questions I am not sure how to solve. enter image description hereenter image description hereenter image description here

  1. I know how to calculate every circuit output gain, but I don't know how this power limit works, I mean why do need to detect the current and amplified the current (Figure 5) and sum it up with input voltage.
  2. What does Feed-forward voltage mean?
  3. I do not understand in figure 7, why this is called power limit circuit.

I read this document and these three questions I am still confused, hope someone can give some advice, and I will be very appreciative.

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  • \$\begingroup\$ There’s some amplification and filtering due to the capacitor in the feedback circuit. It’s a POWER (as in Volts times Amps) monitoring circuit. Wikipedia can explain feedforward. \$\endgroup\$
    – Kartman
    Jul 16, 2021 at 23:09
  • \$\begingroup\$ @Kartman I do not quite understand how this circuit work, I do not understand why I need to detect the input voltage. \$\endgroup\$
    – EEC
    Jul 17, 2021 at 3:03
  • \$\begingroup\$ how else are you going to measure power without measuring the voltage? Power = Volts times Amps. thus you need to measure current and voltage. \$\endgroup\$
    – Kartman
    Jul 17, 2021 at 6:24
  • \$\begingroup\$ @Kartman Yes, I know P=V*I, but in this circuit, it sums up the voltage and current not multiply. and how do I know how much gain I need? \$\endgroup\$
    – EEC
    Jul 17, 2021 at 7:07

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