Current limit circuit for IGBT spark drive applications
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United States of America Patent
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-
Mar 14, 1995
Grant Date -
N/A
app pub date -
Aug 3, 1992
filing date -
Aug 3, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method for current limiting applications to control the current through MOSFETs or IGBTs. An amplifier having a single, high-frequency pole is used to drive the large gate capacitance of a power MOSFET or IGBT. The current in the power transistor generates a negative feedback voltage in a sensing resistor. This feedback voltage is compared with a reference voltage to determine the output voltage of the amplifier. This provides greater stability for driving IGBT transistors, and the actual frequency response is only dependent upon the poles generated by the power transistor and its load. The current in the transistor ramps up to a value determined by the reference voltage, and then settles to a constant value with little or no overshoot or oscillation.
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