SMPS with a variable frequency start up circuit

Details SMPS with a variable frequency start up circuit SMPS with a variable frequency start up circuit

1997-11-24

1999-05-11

Nguyen, Matthew

Electric power conversion systems

Current conversion

With starting arrangement

H02M3/00

Patent

active

059034513

ABSTRACT:
The invention relates to a switch mode power supply (SMPS) comprising control means (IP1) including an oscillator (OS) for generating a pulse-width modulated signal (V2). The object is to provide a fast start-up time over a wide mains input-voltage range (AC). According to the invention, the switch mode power supply comprises a network (T2, R52, R51, R24) which provides in case of a high input voltage a soft start with a low oscillating frequency and in case of low input voltage a start-up with essentially the normal oscillating frequency. The invention provides a fast start-up time over a wide mains input voltage range of 90 Volt up to 265 Volt. The network includes a transistor (T2) used in inverse mode as a switching element which provides a threshold value of about 150 Volt. The power supply can be used advantageously as part of a TV receiver.

REFERENCES:
patent: 3936115 (1976-02-01), Dietz
patent: 4429259 (1984-01-01), Luz
patent: 4734771 (1988-03-01), Lendaro et al.
patent: 5291386 (1994-03-01), Wu

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