BATTERY CHARGING DEVICE, 3-PHASE VOLTAGE GENERATION CIRCUIT, 3-PHASE VOLTAGE GENERATION METHOD, AND DELAY ANGLE CONTROL METHOD

摘要

In a battery charging device, a U-, V-, W-phase voltage generation circuit (11) detects a voltage signal Vu of a sub-coil Su of the U-phase of a 3-phase AC generator (1) and generates a rectangular wave signal synchronized with the U-phase. The U-, V-, W-phase voltage generation circuit (11) generates a first triangular wave in synchronization with the phase from 0 to 180 degrees of the U-phase and a second triangular wave in synchronization with the phase from 180 to 360 degrees. The U-, V-, W-phase voltage generation circuit (11) generates: a V-phase rectangular wave having a level inverted at the voltage point of 2/3 of the peak voltage of the first triangular wave and inverted at the voltage point of 2/3 of the peak voltage of the second triangular wave; and a W-phase rectangular wave having a level inverted at the voltage point of 1/3 of the peak voltage of the first triangular wave and inverted at the voltage point of 1/3 of the peak voltage of the second triangular wave.