METHOD AND APPARATUS FOR SHORT CIRCUIT PROTECTION OF POWER SEMICONDUCTOR SWITCH
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United States of America Patent
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Issued Date -
Jun 4, 2015
app pub date -
Dec 3, 2014
filing date -
Dec 4, 2013
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Abstract
A method and apparatus are provided for a power semiconductor switch. A current through the switch is responsive to a control terminal voltage at a control terminal of the switch, and the control terminal voltage is driven by a driver unit. The method includes measuring or estimating the current based on a bond voltage of the switch, detecting a short circuit by comparing the measured or estimated current to a short circuit current limit, controlling an on-state voltage level of the control terminal voltage based on the comparison to limit the current through the switch during the short circuit, and controlling the control terminal voltage to an off-state voltage level to turn the switch off. The on-state voltage level voltage is controlled by pulse-width modulating the output of the driver unit. A switching frequency of the modulation is at least the cut-off frequency of low-pass characteristics of the control terminal.
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