PROTECTION TO A POWER CONVERTER BY USING A HIGH-VOLTAGE START-UP DEVICE IN A CONTROLLER CHIP OF THE POWER CONVERTER
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United States of America Patent
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Issued Date -
Mar 24, 2011
app pub date -
Sep 17, 2010
filing date -
Sep 22, 2009
priority date (Note) -
Abandoned
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Abstract
A controller chip provides protection to a power converter by using a high-voltage start-up device in the controller chip, without additional pins or external elements of the controller chip. A JFET is used as the high-voltage start-up device connected between a high-voltage pin and a power input pin of the controller chip, to charge a power capacitor connected to the power input pin at power on. The controller chip monitors the voltage at the power input pin and turns off the JFET once the voltage at the power input pin increases to reach a threshold. Thereafter, the source voltage of the JFET will reflect the voltage at the high-voltage pin, and a protection circuit monitors the source voltage of the JFET to trigger a protection signal.
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