Patent ID: 7457141

Claim:
A power supply device having a DC output unit which performs outputting under constant-voltage/constant-current control, comprising: a constant-current control device which performs a first constant-current control operation for maintaining a first current value and a second constant-current control operation for maintaining a second current value which is larger than the first current value; a voltage detecting device which detects a voltage drop of the DC output which is caused by a rush current; a temperature detecting device which detects a temperature of the power supply device; and a switching device which switches a constant-current control operation from the first constant-current control operation to the second constant-current control operation when said voltage detecting device detects a voltage drop of the DC output while said constant-current control device performs the first constant-current control operation, and switches a constant-current control operation from the second constant-current control operation to the first constant-current control operation when said temperature detecting device detects that a temperature of the power supply device exceeds a predetermined temperature while said constant-current control device performs the second constant-current control operation.