U104 acts as a current limiter. When the current is over predetermined
rating, U104 is activated and decreases the current. U208 provides a
reference voltage. U206 is the inverter amplifier. U103 is a comparator
amplifier which compares reference voltage and feedback voltage, and
then delivers to Q102, which then calibrates the output voltage.
When the unit is overloaded, Q107 activates to control the current
magnitude of Q102, to limit the output current. The relay control circuit
controls the power dissipation in the series-wound regulated circuit.
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