Battery charging apparatus

摘要

A battery charging apparatus is connected between a three-phase AC dynamo (11) and battery (15), and has input terminals respectively connected to output terminals (U, V, and W) of respective phases of the three-phase AC dynamo (11), a rectifying circuit (14) including a plurality of rectifying elements and a plurality of switching elements, a control circuit (16) which controls turn-on/off of the respective switching elements, and a pulse signal generator (18) which generates a pulse signal (Tp) by detecting passage of a reluctor (17) arranged on a rotor of the three-phase AC dynamo (11) Line voltage sensors (162, 163) detect potential differences between potentials of two input terminals of the plurality of input terminals and the ground potential of the battery (15). An inverter controller (161) controls the plurality of switching elements, determines a phase order of three-phase AC outputs input to the input terminals based on a pattern of the potential differences detected by the line voltage sensors (162, 163), and specifies phases of the three-phase AC outputs input to the input terminals based on the relationship among the phase order, a generation timing of the pulse signal (Tp), and the potential differences of the plurality of input terminals.