Battery charging device, three-phase voltage generating circuit, three-phase voltage generating method, and retardation control method

摘要

In the battery charging apparatus of the present invention, the U, V and W phase voltage generating circuit 11 detects the voltage signal vu of the U-phase sub Coyle Su of the three-phase alternating current generator 1, and generates a rectangular wave signal synchronized with the U phase. The first triangular wave is generated in synchronism with the phase of 0.degree. To 180. Degree. Of the rectangular wave of the U phase, and a second triangular wave is generated in synchronism with the phase of 180.degree. To 360. Degree.. Then, the level reversal at the voltage point of 2 / 3 of the peak voltage of the first triangular wave is generated, and a V-phase rectangular wave which is level reversal at a voltage point of 2 / 3 of the peak voltage of the second triangular wave is generated, and the level counter is at the voltage point of 1 / 3 of the peak voltage of the first triangular wave In turn, a w-phase rectangular wave which is level inverted at a voltage point of 1 / 3 of the peak voltage of the second triangular wave is generated.