Patent ID: 8482271
Filing Date: 2013-07-09
Classification: H02M,Y02B

Abstract:
1. A switching power supply apparatus comprising: a power circuit unit, the power circuit unit comprising a first switching element connected at a first end to a first end of a power supply, an inductor connected at a first end thereof to a second end of the first switching element, a first output terminal connected to a second end of the inductor, a second output terminal connected to a second end of the power supply, a capacitor connected between the first output terminal and the second output terminal, and a second switching element connected between the second end of the power supply and a second end of the first switching element; and an optimal response multi-mode digital current program mode control unit, the optimal response multi-mode digital current program mode control unit comprising an error signal generator which generates an error signal according to a potential difference between an output voltage and a preset voltage, an inductor current detector which detects and amplifies an inductor current, a mode detector which detects an abrupt change of the output voltage and switches an operation mode; a peak/valley detector & optimal current difference calculator which detects an extreme value of the output voltage and calculates a charge quantity lost by the capacitor; and an inductor current detection storage circuit which detects and stores an inductor current obtained when an extreme value of the output voltage is detected, and on-off control of the first switching element or the second switching element being exercised according to control of the mode detector, the peak/valley detector & optimal current difference calculator, and the inductor current detection storage circuit.