Two stage power supply start up circuit

Details Two stage power supply start up circuit Two stage power supply start up circuit

1999-05-28

2000-05-30

Riley, Shawn

Electric power conversion systems

Current conversion

With starting arrangement

363 98, 363132, H02M 324, H02M 75387

Patent

active

060698055

ABSTRACT:
A two-stage power supply start up circuit is provided for pulse width modulator controllers that operate at a low steady state voltage. The invention provides for high-energy storage in low-capacitance start up capacitors by cascading switched start up stages, thereby allowing for the utilization of smaller, less expensive components. The invention utilizes a three-phase start up process with positive feedback ensuring both reliable start-up and steady state operation. The three phases are as "first phase start-up", which provides power to the control circuit, "second phase start-up", where the control chip starts switching, and "steady state", where the power supply runs in its normal mode.

REFERENCES:
patent: 4717994 (1988-01-01), Diaz et al.
patent: 4941076 (1990-07-01), Diaz

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