Control circuit of power supply unit which controls output power of external power supply based upon current from the external power supply, power supply unit and control method thereof

摘要

The control circuit 30 of power supply unit and power supply unit 10 controlling output power with electric power supplied from the external power 15, comprise a monitoring portion 40 monitoring current I1 and voltage outputted from the external power supply 15 and output power of the external power supply 15 and a setting portion e1 which sets an upper limit value of current outputted from the external power supply 15 based on a monitoring result of the monitoring portion 40.