Control circuit for DC convertors - has pulse generator for transistor control and pulse transformer

摘要

The pulse transformer is provided between the pulse generator and control path of the control transistor. It has one or two different control windings for generation of switching on or blocking pulses. They are periodically connected to a capacitor in turns. Charge and discharge process of the capacitor is controlled by an auxiliary circuit, so that when the dc convertor is switched on or off, generation of pulses able to trigger the control transistor is suppressed when the capacitor voltage for blocking pulse generation is below the nominal value.