G - Physics – 01 – R
Patent
G - Physics
01
R
324/59
G01R 29/00 (2006.01) G01R 19/04 (2006.01) G01R 19/165 (2006.01) G01R 31/02 (2006.01) G01R 31/08 (2006.01) H02H 3/247 (2006.01)
Patent
CA 1067581
Abstract of the Disclosure Disclosed is apparatus which provides a warning or "brownout" signal which indicates a likelihood of low power in an AC wave. This condition is measured by analysis of the peak voltage attained by each half cycle. Every power supply is designed for an AC supply having a nominal peak voltage. Defective or "runt" half cycles are those whose peak is less than a predeter- mined percentage of nominal peak voltage. In this invention, each low voltage or runt half cycle causes the contents of a counter to be changed by a pre- determined value. A preferred level for the peak voltage of any half cycle, below which the half cycle is classified as a runt is 90% of nominal. Each time the maximum voltage of a half cycle equals or exceeds the predetermined percentage of nominal, the counter contents are changed by A second predator mined value in the opposite direction unless the excess of good over runt half cycles is so great that the counter has reached a third predetermined value, If the count maintained in the counter ever reaches a fourth predetermined value because of a large number of runt half cycles, a brownout signal is issued, By proper choice of the first through fourth predetermined values, this apparatus can be made more or less sensitive to runt half cycles.
272852
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