| 摘要 |
PURPOSE:To reduce strain on supply voltage by minimizing variation in current when changing the phase of power supply in which a regenerative current is fed back. CONSTITUTION:When changing the phases R2, S2 and T2 of power supply in which a regenerative current is fed back, one of switching elements SW1-SW6 is turned on before the previous one is turned off. These two switching elements' being on during switching operation, represents a short circuit between the phase terminals of the power supply. However, the voltage of a phase in which one switching element is to be turned off is almost equal to that of a phase in which another switching element is to be turned on; therefore, variation in voltageis slight. For the reason variation in current is slight as well, which minimizes strain on supply voltage. This prevents the malfunctions of electrical apparatus and machines connected to the power supply due to strain thereon. |
