In these days, quite a many types of electrical device/unit use inverters as their key components. And, most of such inverters conventionally employ the Royer's circuit which is designed to use pulse current of rectangular form as input. On the other hand, the inverter prototype that the author has developed features the two points that 1) it employs pulse current of sharp spike form as input, and that 2) it takes advantage of transient phenomenon to be occurred simultaneously in the circuit for attaining a certain level improvement of the efficiency. Taking advantage of the above two features in combination; it becomes possible to develop a new type of inverter driven by positive EMF which gives outstanding efficiency. Now, consider what is “positive EMF”? It is electromotive force which is in the same direction as that of the input current. On the other hand, the so-called “back EMF” to be induced according to the well-known Faraday's law, is in the direction reverse to the input current. They are utterly different in nature. The value of the positive EMF to be induced in the coil depends on the rate of change of magnetic flux, where the second-order and even higher-order time derivatives of magnetic flux are involved.