| 摘要 |
PURPOSE:To simplify a composition and prevent voltage/current surge from being generated, by dividing a choke coil for a filter. CONSTITUTION:DC power sources 51, 52 and switch elements 1, 2 are alternately turned ON/OFF, and via a filter consisting of choke coils 31, 32, and a capacitor 4, current is fed to a load. By changing the interval of the ON/OFF of the switch elements 1, 2, PWM-performed and AC-converted output can be fed to the load. This invention has the characteristic of providing switch 1 side and switch 2 side with the choke coils 31, 32, respectively. The switch elements 1, 2 are combined with the capacitor 4 of a low frequency section through the respective smoothing choke coils, and so the sudden change or the like of voltage along with the switching of the one switch element is not transferred to the other switch element. Accordingly, overcurrent can be prevented from flowing through both the switch elements. |
