Common mode rejection coupler

Details Common mode rejection coupler Common mode rejection coupler

1980-04-07

1982-10-05

Smith, Alfred E.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

330258, H03K 342, H03F 345

Patent

active

043529984

ABSTRACT:
A common mode rejection coupler in a power switching system having a variable common mode voltage includes a first optical isolator circuit for receiving an input signal and generating in response thereto a first signal which is normally isolated with respect to the common mode voltage. A second optical isolator circuit receives the complement of the input signal and generates a second signal which is also normally isolated with respect to the common mode voltage. The first and second signals are the complement of one another. A comparator receives the first and second signals and generates an output signal which changes state only when the first and second signals complement states. Feedback control circuitry for the comparator is provided for limiting transient changes in one of the first and second signals to prevent the comparator from changing output states when a transient change occurs in one of the first and second signals resulting from a change in the common mode voltage.

REFERENCES:
patent: 3453554 (1969-07-01), Shoemaker
patent: 4162456 (1979-07-01), Lukes

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