Application of a new orthogonal-flux-type amorphous core to high-frequency parametric inverters and three-phase measuring transformers

The fundamentals of a parametric oscillator using an orthogonal-flux-type amorphous core are described, and several applications are proposed. The parametric oscillator circuit has a power-conversion efficiency of 42% and automatic overcurrent protection. The flux distribution calculated by the finite-element method (FEM) suggests that the discharge of a tuning capacitor generates a circulating flux in a leg of the core. The parametric oscillator, a self-oscillating invertor using a Royer circuit, shows an efficiency of 47% at 18.5 kHz and offers overcurrent protection. As a separately controlled parametric inverter, it operates at a frequency of 74 kHz and shows an efficiency of 14% at the maximum output power of 11 W. It can also be used as a potential transformer and as a current transformer in a three-phase system