Title :
Application of a new orthogonal-flux-type amorphous core to high-frequency parametric inverters and three-phase measuring transformers
Author :
Yamasawa, Kiyohito ; Biringer, Paul P.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
fDate :
5/1/1990 12:00:00 AM
Abstract :
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
Keywords :
current transformers; finite element analysis; invertors; parametric oscillators; potential transformers; 11 W; 18.5 kHz; 74 kHz; Royer circuit; automatic overcurrent protection; circulating flux; current transformer; discharge; finite-element method; flux distribution; high-frequency parametric inverters; orthogonal-flux-type amorphous core; parametric oscillator; potential transformer; power-conversion efficiency; self-oscillating invertor; three-phase measuring transformers; tuning capacitor; Amorphous materials; Capacitors; Circuit optimization; Control systems; Finite element methods; Inverters; Leg; Oscillators; Power system protection; Tuning;
Journal_Title :
Magnetics, IEEE Transactions on