Title: Over-voltage protection circuit

Abstract: An over-voltage protection circuit for an electric generating machine having a controlled rectifier for shunting the output winding of the machine in the event of an over-voltage condition includes impedance means connected in series with the controlled rectifier and regulation circuitry responsive to current flowing through the impedance means for preventing the excitation of the field when the controlled rectifier is conductive. An improved triggering circuit including a Zener diode and a transistor switch is employed to assure proper triggering of the controlled rectifier.

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Other info:

Inventors: Jakobs, Hans (Cook County, IL, US)
Juhnke, Charles J. (Deerfield, IL, US)

Application Number: 474011
Filing Date: 1974-05-28
Publication_date: 1976-01-06
Assignee: C. E. Niehoff & Co. (Chicago, IL)
Primary Class(es): 361/56 361/52, 361/91.6
Other Classes:
US Patent Ref:

3469168	Sep, 1969	Harlan, Jr. et al.	322/28.
3488560	Jan, 1970	Konopa	317/31.
3581150	May, 1971	Kirk et al.	317/31.
3651379	Mar, 1972	Moisand et al.	317/33.
3702962	Nov, 1972	Wohr et al.	317/33.

Other Refs:
Primary Examiner: Shoop, William M.
Assistant Examiner: Salce, Patrick R.
Attorney: Mason, Kolehmainen, Rathburn & Wyss