SWITCHING DRIVE CIRCUIT

PURPOSE:To perform an efficient drive without necessity of an element necessary to consume counterelectromotive force by returning energy of the counterelectromotive force produced at a coil at the switching time to a power source and effectively utilizing it. CONSTITUTION:When a transistor TR1 is turned OFF, counterelectromotive force eB of the polarity, shown, is generated in the second coil L2 by the electromagnetic induction, and a current I2 is flowed in a passage of the common terminal T0 of the second coil L2, a power source E, a diode D2 and the connecting terminal T2 of the second coil L2. Thus, the energy stored in the first coil L1 is returned to the power source E from the second coil L2 and regenerated when the transistor TR1 is turned OFF.