Ac Current Limiter Circuit Diagram. Current limiting is the practice in electrical and electronic circuits of imposing an upper limit on the current that may be delivered to a load to protect the circuit generating or transmitting the current from harmful effects due to a short circuit or overload. The three types of inrush limiting circuits designers use most are a negative temperature coefficient ntc thermistor a relay and a mosfet bypass circuit.
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To avoid possible component damage caused by inrush current an inrush limiting circuit is generally required for an ac dc power supply. Inrush current limiting in a dc dc converter in the dc power circuit of a dc dc converter or the like an ntc thermistor is used as a power thermistor and effectively limits an inrush current with which the input and output capacitors are charged at the time of powering on. The resistor r1 is there to sense the current.
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R1 limiting resistor vref current or r1 1 25 current. 0 87 1 d. In view of the possible damage to a power supply in cases of overload current limiters are almost always fitted and they are a standard feature incorporated into regulated power supply ics. At r2 potentiometer at minimum resistance the center tap connected to r1 if the current drawn by the load reach 1 2a then the voltage across r1 reach 0 6v and q2 begin conducting thus shorting the base voltage of q4 to ground.
