The transient processes end energy balance in inductive energy storage including ferromagnetic opening switch

The paper examines switching in an inductive storage using a solenoid with the toroidal core as an analog of the opening switch. Core magnetization is determined by the combined action of two orthogonal induction components: the toroidal one B/sub /spl theta// and poloidal one B/sub /spl phi//. The toroidal induction component is determined by the switched current and the poloidal one by control current. The core is deeply saturated in its initial state. After switching off the control current producing the field B/sub /spl phi//, and sharp decrease in the B/sub /spl theta// field due to current transition from the switch to the load, the core is demagnetized, and switch inductance increases sharply. It is well known that in commonly used switching circuits energy is partly dissipated in the switch. In the examined case this part of energy for an ideal core (excluding hysteresis and eddy current losses) passes into the control circuit. It either dissipates in this circuit when the control current is switched off, or may be transferred into an inductance of the control circuit. The paper examines the transients in the main and control circuits and the energy balance. The calculation example is given and the possibility of the parametric optimization of the ferromagnetic opening switch (FOS) is shown.