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Introduction to Morgan Circuit

The Morgan circuit is an inductor-capacitor commutation thyristor vibration converter; it is used for DC voltage stabilization and voltage regulation.

Its characteristic is that only one thyristor is used and the commutation inductor is a saturated inductor, which simplifies the control circuit and improves the switching characteristics, and reduces the commutation inductor volume. Under the initial condition, the capacitor C is charged and the inductor is in positive magnetic saturation.

If the thyristor is turned on by a trigger pulse at a certain moment, the load current passes through the SCR, the inductor L₂ and the load R, so that the inductor is desaturated. At the same time, the capacitor C is discharged through L and the thyristor. Before the inductor is not saturated, the discharge is very slow. When the discharge of the capacitor causes the inductor core to reversely saturate, the discharge accelerates. After the discharge is completed, the capacitor is reversely charged by the autotransformer of L and L₂. When this reverse charging current exceeds the load current, the thyristor is turned off because its direction is opposite to the load current. V; continue to charge C forward through L, L₂ and R, and return to the initial condition. Prepare for the next commutation. This completes one working cycle.

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