Zero axis crossing detector

Details Zero axis crossing detector Zero axis crossing detector

1976-11-18

1979-01-02

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

328150, H03K 5153

Patent

active

041329090

ABSTRACT:
A zero axis crossing detector for integrated bipolar circuits comprising two current paths connected in parallel to the input for the alternating current signal, for receiving direct current alternately in each path in dependence on the positive and negative half cycles of the alternating current signal and blocking both current paths during zero phases of the alternating current signal, a contant current source providing a direct current output across the paths during positive and negative half cycles and a transistor in each current path connected in a current mirror circuit and connected to provide the same current values of the current supplied by the constant current source in both current paths.

REFERENCES:
IBM Technical Disclosure Bulletin, vol. 12, No. 8, Jan. 1970, p. 1177, "Zero-crossing Detector and Pulse Generator," by L. M. Koch.

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