ESAB Caddy Mig C200i Service Manual page 21

The current reference signal IREF_IN from the voltage regulator is delivered via 2
diodes to the current input (COMP) of the PWM controller IC11. Diodes were
applied to compensate voltage drop on diodes embedded in the IC11.
Current feedback is provided by means of the current transformer TO02, placed on
the power PCB. Pulsed current signal is delivered to the current sense input
(Isense) of the IC11. As the voltage on the DC bus is stable, the average primary
current is proportional to the drawn power. Therefore, the signal from the current
transformer is also given the input of the integrator on IC9 (8,9,10), providing the
power limitation.
Edition 101222
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s1Cad200