G - Physics – 01 – R
Patent
G - Physics
01
R
324/68
G01R 19/25 (2006.01) G01R 13/02 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1166314
ABSTRACT OF THE DISCLOSURE An analogue voltage-to-digital converter has a voltage divider with a plurality of steps for comparison with the unknown voltage and in addition provides interpolation between steps to improve the accuracy. Interpolation is effected by adding a ramp voltage to the unknown ramping through a magnitude equivalent to at least one step. With one tap on the voltage divider selected, comparison of the unknown plus ramp voltage is effected successively as the voltage ramps. By noting when the combined voltage reaches the level of one of the reference voltages and by counting the number of comparisons made from the time when the ramp voltage is at a predetermined magnitude and comparing this with the time taken to ramp through one or a plurality of whole steps, determination can be made of the magnitude of the unknown voltage to a fraction of a step.
384867
Ridout & Maybee Llp
South Eastern Electricity Board
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