Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1991-01-28
1993-03-23
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361 56, H02H 709, G01R 136
Patent
active
051969807
ABSTRACT:
A low impedance overvoltage protection circuit includes a first MOSFET having a drain connected to an input signal and a source connected to a drain of a second MOSFET, the source of the second MOSFET being coupled to the output. The gates of the first and second MOSFETs are connected to voltage supplies which float relative to the input signal values so as to maintain the gates of the respective MOSFETs biased to a conducting state. The maximum and minimum values to which the floating voltage supplies will float are defined by clamping diodes and clamp voltage sources. When the input signal value exceeds a desired positive maximum value, the first MOSFET is no longer biased to an on state whereby the MOSFET turns off, shunting the input signal through a high impedance for limiting input current and removing the input signal from the output. Negative going peak values are removed in a like manner by the second MOSFET. Bipolar transistors are coupled to each MOSFET to allow quick turn off in the event of rapid rise time transient input values.
REFERENCES:
patent: 3886379 (1975-05-01), Bickley et al.
patent: 4020395 (1977-04-01), Erickson et al.
patent: 4405964 (1983-09-01), Woods et al.
patent: 4533970 (1985-08-01), Brown
patent: 4658320 (1987-04-01), Hongel
Dellett John P.
John Fluke Mfg. Co. Inc.
Koske Richard A.
Leja Ronald W.
Pellinen A. D.
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