High speed power supply circuit with circuit with positive feedb

Details High speed power supply circuit with circuit with positive feedb High speed power supply circuit with circuit with positive feedb

1990-05-21

1992-03-31

Skudy, R.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 21, 363 97, H02M 3335

Patent

active

051013347

ABSTRACT:
A self-oscillating power supply circuit comprises a series arrangement of the primary winding (N.sub.1) of a transformer (TR), the main current path of a first semiconductor switch (T.sub.1) and a current measuring resistor (R.sub.1). The first semiconductor switch is driven by a second semiconductor switch (T.sub.2) which in turn is controlled by a comparator (CP). The voltage across the current measuring resistor is applied to the non-inverting input (6) of the comparator and, a reference voltage obtained from a reference voltage source (RS) is applied to the comparator inverting input (5). By arranging a capacitor (C.sub.2) between the output of the second semiconductor switch and the inverting input (5) of the comparator, the first semiconductor switch rapidly turns-off at the end of the forward phase at an accurately determined current through the primary winding. By applying a lower reference voltage to the comparator at a higher mains voltage, an output current is obtained from the transformer secondary winding (N.sub.2) for the load L, which is substantially independent of the mains voltage.

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