Patent ID: 8901907

Claim:
A current-limit system for limiting an average current of an output signal of a DC-DC converter, the current-limit system comprising: a current sensing device, coupled to the DC-DC converter, for detecting the average current of the output signal of the DC-DC converter; and a current-to-voltage converting module, coupled to the current sensing device, for converting the average current into a clamp voltage, in order to control the DC-DC converter according to the clamp voltage; wherein the current sensing device comprises a first resistor, for detecting the average current of the output signal, and the current-to-voltage converting module comprises: a first compensation voltage source, coupled to the first resistor, for compensating voltages of two terminals of the first resistor; and a first comparator, coupled to the first resistor and the first compensation voltage source, for comparing a voltage difference between the two terminals of the first resistor and a voltage of the first compensation voltage source to output the clamp voltage.