Switching controller with current limiter - has operational amplifier each for controller and limiter which both control transistor applying supply voltage

摘要

The controller has a filter section, a power amplifier, a current limiter and a voltage stabiliser. An operational amplifier is allocated to the controller and to the current limiter. The controller amplifier compares the output with a reference voltage. It switches forward or blocks a transistor applying the supply voltage of a certain frequency determined by a timing circuit connected to the amplifier non-inverting input. The other amplifier, associated with the limiter, controls the first amplifier which is made conductive when the current through an inductance at the stabiliser output reaches a certain value. It is blocked when the load current reaches the maximum limiting current value.