Switched-mode power supply having an improved start-up circuit

Details Switched-mode power supply having an improved start-up circuit Switched-mode power supply having an improved start-up circuit

1998-04-17

1999-12-14

Nappi, Robert E.

Electric power conversion systems

Current conversion

With starting arrangement

363 20, H02M 7517

Patent

active

060025980

ABSTRACT:
A switched-mode power supply includes a transformer (TR) provided with a primary winding (P) having a first primary terminal (1), coupled to receive a voltage (U) with respect to a ground terminal (GND), and a second primary terminal (2); a controllable switch (SM) coupled between the second primary terminal (2) and the ground terminal (GND); and a start-up circuit (ST) for starting up the switched-mode power supply. The start-up circuit (ST) includes a field effect transistor (T) of the normally-on type having a drain coupled to the second primary terminal (2), a source, and a gate. The start-up circuit (ST) further includes a voltage stabilizer (VS) for supplying an internal supply voltage to an internal supply terminal (VINT), the voltage stabilizer (VS) being coupled to the source.

REFERENCES:
patent: 5581453 (1996-12-01), Ueta et al.
patent: 5812383 (1998-09-01), Majid et al.
patent: 5841643 (1998-11-01), Schenkel

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