Power supply circuit

Details Power supply circuit Power supply circuit

1989-09-07

1990-07-03

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 21, 363 97, H02M 3335

Patent

active

049396323

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.

REFERENCES:
patent: 4263643 (1981-04-01), Koike
patent: 4415960 (1983-11-01), Clark
patent: 4546421 (1985-10-01), Bello et al.
patent: 4607319 (1986-08-01), Assow et al.
patent: 4628429 (1986-12-01), Walker
patent: 4731719 (1988-03-01), Nelson
patent: 4763061 (1988-08-01), Schwarz

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