Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-06-25
1985-01-29
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307353, 307354, 307362, H03K 5153, H03K 524
Patent
active
044968558
ABSTRACT:
A high-voltage sensing logic circuit for detecting the occurrence of an input signal level applied to the circuit which exceeds a predetermined threshold voltage level and for providing a unique output signal level in response thereto, the circuit adapted to operate over first and second time intervals from a voltage source providing supply and reference voltage levels wherein first and second chargeable devices with first terminals connected to form a common node are charged to substantially the supply voltage level at the common node during the first time interval. The first chargeable device has a second terminal to which is alternately applied reference and supply voltage levels during the first and second time intervals, respectively. The second chargeable device has a second terminal connected to a second node. During the second time interval, the common node voltage level is boosted above the supply voltage level or clamped to the supply voltage level in accordance with the input signal level being less than or exceeding the threshold voltage level, respectively, the boosting or clamping resulting in a high or unique low output signal level at the second node defined by the second terminal of the second chargeable device. Also provided is a method for detecting when the input signal level to a logic circuit exceeds a predetermined threshold voltage level and for providing a unique output signal level in response thereto comprising the steps of charging first and second chargeable devices to establish a voltage level substantially equal to the supply voltage level at a common node of the first and second chargeable device during a first time interval, and either elevating or clamping the voltage level of the common node relative to a supply voltage level in accordance with the input signal level either being less than or exceeding the threshold level, respectively, during a succeeding time interval to provide a high or unique low output signal level, respectively, at a second node defined by one terminal of the second chargeable device.
REFERENCES:
patent: 2850649 (1958-09-01), Schroeder
Hamann H. Fredrick
Rockwell International Corporation
Uchizono S. Alfred
Zazworsky John
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