Overvoltage-protective device

Details Overvoltage-protective device Overvoltage-protective device

1988-01-26

1990-04-03

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, H02H 320

Patent

active

049145401

ABSTRACT:
Voltage-dividing resistors, being connected in parallel to a switching element to be protected, create control voltage which is responsive to voltage applied to the switching element, to supply the same to a gate of a field effect transistor. The field effect transistor is connected in parallel to the switching element, to conduct when the control voltage exceeds a threshold value for passing overvoltage absorbing current, while causing high-frequency shorting across the switching element by its parasitic capacitance.

REFERENCES:
patent: 4323942 (1982-04-01), Hartman et al.
patent: 4449158 (1984-05-01), Taira
patent: 4546401 (1985-08-01), Suedberg
patent: 4630162 (1986-12-01), Bell et al.
patent: 4658320 (1987-04-01), Hougel
patent: 4739437 (1988-04-01), Morgan
patent: 4745511 (1988-05-01), Kugelman et al.
"Application of High Voltage Darlington Transistors in AC Motor Controls", CH 1817-6/82/0000-0736s00.75.COPYRGT. 1982 IEEE, pp. 736-740.
Hitachi Power MOS FET Data Book, May 1985, pp. 16-19.
"Snubbers for Pulse Width Modulated Bridge Converters with Power Transistors or GTOs", IPEC-Tokyo '83, pp. 313-323.
Protection of Power Mosfets From Transcient Overvoltages J. Tihanyi pp. 56-57, 1985.

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