CPC H02M 3/155 (2013.01) [H03K 4/08 (2013.01)] | 10 Claims |
1. An emulated current generation circuit of a power converting circuit providing an emulated sensing current comprising an AC component current and a DC component current, the emulated current generation circuit comprising:
a ramp signal generator, coupled to a setting resistor and configured to use the setting resistor to generate a ramp signal as the AC component current;
a current sensing circuit, coupled to an output stage of the power converting circuit and configured to provide a sensing current related to an inductor current flowing through an inductor coupled to the output stage, wherein the DC component current is generated after a sample-and-hold processing is performed on a valley value of the sensing current, and a resistance of the setting resistor is related to an inductance of the inductor;
a combination circuit, coupled to the ramp signal generator and the current sensing circuit respectively and configured to combine the AC component current and the DC component current into the emulated sensing current; and
a calibration circuit, coupled to the ramp signal generator, the current sensing circuit and the combination circuit respectively and configured to dynamically adjust a slope of the ramp signal according to the emulated sensing current and the sensing current,
wherein the emulated sensing current is a full-emulated sensing current generated by predicting a change of the sensing current to emulate a waveform of the sensing current to set the AC component current and to emulate the valley value of the sensing current to determine the DC component current.
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