Battery charging apparatus for vehicle

A battery charging apparatus for a vehicle, comprising:

• a driver unit that converts three-phase AC power outputted from a winding of each phase of a stator of a three-phase AC generator into DC power using a plurality of switching elements to supply the DC power to a battery;
• a control unit that controls switching between an energized state and non-energized state of each of the plurality of switching elements;
• and
• a position detection unit that outputs a position detection signal indicating a position of a rotor of the three-phase AC generator,
• the control unit obtaining a next estimation power generation period of the three-phase AC generator on the basis of the previous position detection signal and determining a next energization period of each of the plurality of switching elements on the basis of the estimation power generation period,
• wherein the control unit judges start of the energization period on the basis of input of the position detection signal, and, if a period until next input of the position detection signal exceeds the energization period, during the period until the next input of the position detection signal, the control unit has a maintenance period in which the plurality of switching elements are maintained in the energized state or non-energized state immediately before the period until the next input of the position detection signal exceeds the energization period.