LS4000

Description

The input voltage of LS4000 is fed via an input fuse, an input filter, a rectifier and an inrush current limiter to a single transistor boost converter. This converter provides a sinusoidal input current (IEC/EN 61000-3-2, class D equipment) and sources a capacitor with a voltage of 360-370 V DC. This capacitor sources a single transistor forward converter.

Each output is powered by a separate secondary winding of the main transformer. The resultant voltages are rectified and their ripples smoothed by a power choke and an output filter. The control logic senses the main output voltage U_o1 and generates, with respect to the maximum admissible output currents, the control signal for the primary switching transistor.

The second output of double output units is controlled by the main output, but has independent current limiting. If the main output is driven into current limitation, the second output voltage will fall as well and vice versa.