Current flow converter circuitry esp. for personal computer - uses transformer free-wheeling diode and switches to provide several output voltages independently regulated at low loss for PC or TV receiver

摘要

A prim. current circuit (PSK) is formed from a series circuit of a prim. winding (PW) of a transformer, a first switch element (SE1) for impulse duration modulation of the voltage to the prim. winding (PW) and a first current measurement device (SME1). A first regulating circuit (RS1) controls the first switch element (SE1) and n sec. current circuits (SSK1) are available, each of which is formed from a sec. winding (SW1) of the transformer. An accumulator choke (DR) is connected serially to the sec. winding, a free wheeling diode (D1) is in parallel with the sec. winding, together with a smoothing capacitor (C) parallel to an output d.c. voltage (Ua) of the sec. current circuit (SSK1). In each sec. current circuit between the sec. winding and the accumulator choke a second switch element (SE2) for impulse duration modulation of the voltage to the accumulator choke (DR) is inserted.