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US 6,555,934 B2Granted
Method and apparatus for control of large-area ground plane potentials
AssigneeGE Medical Systems Global Technology Company, LLC
InventorChristopher R. Miller
Life of this patent
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Abstract
A method for controlling ground plane voltages by locally, at one or more discrete points on the working ground reference, sensing a voltage difference between a working ground reference and an isolated ground reference, generating a voltage compensation signal based on the voltage difference, and driving the working ground reference with the voltage compensation signal to reduce the voltage difference.
Claims17
A ground voltage control system comprising:
- a working ground reference;
- an isolated ground reference connected to the working ground reference such that current flow in the isolated ground reference is reduced below a predetermined threshold;
- a first voltage controller comprising a first sense input connected to the isolated ground reference, a second sense input connected to the working ground reference, and a first controller output connected to the working ground reference, the first controller output carrying a voltage compensation signal to drive current into and out of the working ground reference to offset a voltage difference sensed between the isolated ground reference and the working ground reference;
- and
- a second voltage controller comprising a third sense input connected to the isolated ground reference, a fourth sense input connected to the working ground reference, and a second controller output connected to the working ground reference, the second controller output carrying an additional voltage compensation signal to drive the working ground reference to offset an additional voltage difference sensed between the isolated ground reference and the working ground reference.
2 more elements
A method for controlling ground plane voltage comprising:
- sensing at least one voltage difference between a working ground reference and an isolated ground reference with a plurality of distributed voltage controllers;
- generating at least one voltage compensation signal based on the voltage difference;
- and
- driving current into or out of the working ground reference with the at least one voltage compensation signal to reduce the at least one voltage difference.
1 more element
Dependencies are inferred from the claim text.