Current limit circuit for IGBT spark drive applications

Details Current limit circuit for IGBT spark drive applications Current limit circuit for IGBT spark drive applications

1992-08-03

1995-03-14

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323277, 323284, 307262, G05F 144

Patent

active

053979788

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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patent: 4574249 (1986-03-01), Williams
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patent: 5084668 (1992-01-01), Kotowski et al.
patent: 5107151 (1992-04-01), Cambier
patent: 5124616 (1992-06-01), Wozesinski
patent: 5164659 (1992-11-01), Schultz et al.
patent: 5311069 (1994-05-01), Austin
Brown, Marty, Practical Switching Power Supply Design, 1990, Academic Press Inc., pp. 154-158.

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