DC voltages obtained by rectifying outputs from secondary coils mg, and my are supplied to capacitor C12 and is smoothed by capacitor C12, so that a DC voltage V01 is outputted from output terminals 10 and 11. Therefore, DC voltages derived from capacitors C11 and C]; are connected in parallel. The DC voltage which is produced by rectifying the output of secondary coil mg is applied to capacitor C22 and is smoothed by capacitor C22. The smoothed DC voltage is added to voltage V01 derived from capacitor C11. Voltage V02, as
the sum, is outputted from output terminals 10,12. Thus, the DC voltages derived from capacitors C11 and C22 are connected in parallel with the DC voltages derived from capacitors C11 and C21.