Start-up circuit and control for high power isolated boost DC/DC converters
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United States of America Patent
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Jul 1, 2003
Grant Date -
Oct 31, 2002
app pub date -
May 24, 2001
filing date -
Feb 23, 2001
priority date (Note) -
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Abstract
The invention is a scheme for high power isolated full-bridge boost DC/DC converters to minimize the effect of in-rush current during start-up. A single pulse width modulation controller (PWM) is possible for the present invention for not only start-up but also normal boost modes. A primary circuit can have a clamping switch or at least two choke diodes. The choke diode can include 'push-pull' and 'L'-type configurations. A resistor can be used to dissipate energy clamped from the voltage spike. A startup circuit can be used to eliminate the in-rush current experienced during start-up. The proposed start-up schemes have been experimentally verified using a 1.6 kW, 12V/288 V prototype. Since the present invention eliminates the need to match characteristics of multiple controllers, it significantly reduces the cost associated with implementing this type of technology.
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