Semiconductor power module and power conversion device

Details Semiconductor power module and power conversion device Semiconductor power module and power conversion device

1995-04-18

1997-03-04

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 30, 361 88, 361101, H02H 318

Patent

active

056085958

ABSTRACT:
A semiconductor power module which provides reliable overvoltage protection including an overvoltage protection device which functions so that when an overcurrent flows to an IGBT (1), a sink transistor (10) turns on and the IGBT (1) turns off accordingly. As the IGBT (1) turns off to cut off the overcurrent, a high surge voltage is applied to the IGBT (1). At this time, however, a clamp current flows trough a clamping circuit including a Zener diode (6), a diode (7) and a resistance (8) and part of it is divided to a transistor (Q11), so that a transistor (Q12) turns on and the sink transistor (10) turns off as the result. Accordingly, the clamp current increases a gate voltage of the IGBT (1). Hence, large part of the load current flows in the IGBT (1), and only a little flows to the clamping circuit. Accordingly, overheat of and damage by burning to the clamping circuit will not be caused even if both the overcurrent and overvoltage are applied.

REFERENCES:
patent: 4750079 (1988-06-01), Fay et al.
patent: 5079608 (1992-01-01), Wodarczyk et al.
patent: 5119265 (1992-06-01), Qualich et al.
patent: 5138516 (1992-08-01), Chapman
patent: 5281872 (1994-01-01), Mori
patent: 5304935 (1994-04-01), Rathke et al.
Revue Generale De L'Electricite, No. 2, 1 Feb. 1994, pp. 8-12, XP00042647 Lorenz L: "Drive And Protection Concepts For IGBTS".
IEEE Transactions On Power Electronics, vol. 6, No. 4, 1 Oct. 1991, pp. 576-584, XP00024887 Thiyagarajah K et al: "A High Switching Frequency IGBT PWM Rectifier/Inverter System For AC Motor Drives Operating From Single Phase Supply".

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