Vital "AND" gate apparatus and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Apr 16, 2002
Grant Date -
Jan 17, 2002
app pub date -
Dec 29, 2000
filing date -
Dec 30, 1999
priority date (Note) -
Expired
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Abstract
A method for performing an 'AND' operation on two independent inputs in a fail-safe manner includes cascading two charge pumps to output a condition signal representing the 'AND'ed' state of the inputs. Each independent input has an active state asserted by a waveform of predetermined frequency and duty cycle, and an inactive fail-safe state asserted by a zero voltage. The method includes supplying power to a first charge pump, supplying power from the first charge pump to a second charge pump, and supplying each of the independent inputs to one of the respective charge pumps. A condition signal is output using an output from the second charge pump. Additionally, the method verifies the correctness of the frequency and duty cycle of each independent input using a cross connection scheme. This method provides a high-power, low-loss, and low-cost electrical circuit for operating devices responding to specific voltages, for example, vital relays.
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