Switching control circuit with galvanic isolation and durations of conduction of zero to infinity.

摘要

The invention relates to the switching control components semi - power conductors. / p & & p & to provide a control with galvanic isolation and with a possibility of variation of the very wide durations on and off, it provides that the control circuit is fed through a transformer tr by an oscillator. This oscillator is - even supplies, via a dc voltage which can take two levels (va and vb) according to the power transistor (tp) a command must be turned on or off. The detection of the secondary of the level of voltage va and vb used in the primary and ensures the control of the power transistor tp.