Suppressing electrical bus transients in electronic circuitry
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United States of America Patent
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Apr 22, 2014
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N/A
app pub date -
Dec 22, 2011
filing date -
Dec 22, 2011
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Abstract
An apparatus and method for protecting a switch from overvoltage transients that might otherwise occur when the switch is turned off. A transient-suppression controller controls a rate-of-change of voltage across a switch by delivering control signals to the switch. Controlling the rate-of-change of voltage enables controlled absorption of stored parasitic energy that might otherwise cause overvoltage transients. In some embodiments the switch is a MOSFET and the control signals are currents delivered to the gate of the MOSFET. In some embodiments, control is open-loop; in other embodiments closed-loop control is used to maintain essentially constant voltage across the switch as it turns off.
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