| 摘要 |
PURPOSE:To supply a constant current even when an output voltage drops by connecting an inductance with a center tap to the midpoint of arms, and alternately turning ON and OFF a switching element at the prescribed pulse width. CONSTITUTION:Inductances L1, L2 of center-tap structure is connected with the midpoint of arms made of transistors (Tr)Q1, Q4 and Q2, Q3, and a step up transformer T is connected between the center taps. The Trs Q1, Q2 are alternately turned ON and OFF for a pause period TOFF with the constant pulse width TON by the inverter control, the TrQ3 is turned ON together with the TrQ1, and the TrQ4 is turned ON together with the TrQ2, and the ON period is controlled in the pulse width in a range not exceeding the constant pulse width TON. Thus, when the all energy of the inductances L1, L2 is fed back to the power source E and the Q4 is turned OFF, part is supplied to a load F to supply the prescribed current. |
