Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-12-29
1985-03-19
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307354, 307530, 307494, 307455, H03K 508, H03K 19086
Patent
active
045061718
ABSTRACT:
An improved latching-type comparator operative in a selected one of two exclusive states is disclosed. In one state, the operational state, a gain stage is rendered operative to amplify at least one intermediate current signal generated by an input stage in response to the comparison of a pair of input signals. At least one drive current signal is generated by the gain stage in response to the comparison and is buffered by a corresponding buffer stage to render both an output signal and a signal representative thereof. In the other state, a latch stage is rendered operative unresponsive to the comparison and governed by the signal representative of the output signal to sustain the drive current signal in a state to latch the output signal. A switching stage governed by at least one latch signal effects the selection between the gain and latch stages by conducting operating current exclusively from the selected stage to a constant current stage. An independent second constant current stage provides current for the input stage to maintain its operation continuously independent of the selected date of the comparator.
REFERENCES:
patent: 3694668 (1972-09-01), Foerster
patent: 3728560 (1973-04-01), Treadway
patent: 3818250 (1974-06-01), Reed et al.
patent: 4147943 (1979-04-01), Peterson
Evans William P.
McCabe Robert J.
Naviasky Eric H.
Ben Loha
Miller Stanley D.
Westinghouse Electric Corp.
Zitelli W. E.
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