METHOD FOR IMPROVING EFFICIENCY OF DC-DC CONVERSION CIRCUIT AND CONTROL APPARATUS FOR DC-DC CONVERSION CIRCUIT

摘要

A method for improving the efficiency of a DC-DC conversion circuit and a control apparatus for a DC-DC conversion circuit, the method comprising: while conducting and cutting off a plurality of MOSFET field effect transistors (M_P1, M_P2, M_P3, M_P4; M_N1, M_N2, M_N3) in the conversion circuit according to a preset period, detecting the current flowing through the induction coil (L₀) for energy storage and release in the conversion circuit; when the current flowing through the induction coil (L₀) is lower than the lower threshold of the preset current, delivering a control level to the gates of a part of the plurality of MOSFET field effect transistors (M_P1, M_P2, M_P3, M_P4; M_N1, M_N2, M_N3), thereby enabling the part of the MOSFET field effect transistors to stay in a cut-off state and no longer conducting according to the preset period. The method improves the efficiency of the conversion circuit in a light load state.