Current sensor
AssigneeAnalog Devices International Unlimited Company
InventorsBrent William Hoffman, Jonathan Ephraim David Hurwitz
Life of this patent
Estimating the term…
Abstract
A rate of change of current sensor includes two measurement coils, arranged such that the turns of the first and second measurement coils are interleaved. The rate of change of current sensor further comprises two return coils, arranged to progress in an opposite direction to the measurement coils. The coils form loops and progress substantially around a target measurement conductor. This ensures that the two measurement coils both receive the same electrostatic coupling from external conductors which are not the target of the measurement operation. Further, the two measurement coils are arranged such that the first coil and the second coil are, on average, the same distance to the current-carrying conductor of interest.
Claims20
A current sensor, comprising:
- a path for at least one current-carrying conductor;
- a first measurement coil, wherein the first measurement coil progresses around the path in a first circumferential direction, the first measurement coil having a first end and a second end;
- a first return coil, the first return coil having a first end and a second end, wherein the first end of the first return coil is coupled to the second end of the first measurement coil, wherein the first return coil progresses around the path in an opposite circumferential direction to the first circumferential direction, and wherein the first measurement coil and the first return coil are interleaved along the path;
- a second measurement coil, wherein the second measurement coil progresses around the path in a second circumferential direction, the second measurement coil having a first end and a second end;
- and
- a second return coil, the second return coil having a first end and a second end, wherein the first end of the second return coil is coupled to the second end of the second measurement coil, wherein the second return coil progresses around the path in an opposite circumferential direction to the second circumferential direction, and wherein the first measurement coil and the first return coil are interleaved along the path.
A current sensor, comprising:
- a substrate including a path for at least one current-carrying conductor;
- a first measurement coil formed on the substrate, wherein the first measurement coil progresses around the path in a first circumferential direction to substantially surround the path, the first measurement coil having a first end and a second end;
- and
- a first return coil formed on the substrate, the first return coil having a first end and a second end, wherein the first end of the first return coil is coupled to the second end of the first measurement coil, wherein the first return coil progresses in an opposite circumferential direction to the first circumferential direction around the path, to substantially surround the path,
- wherein the first measurement coil and the first return coil are interleaved along the path.
A cline sensor, comprising:
- a substrate including a path for at least one current-carrying conductor;
- a first measurement coil formed on the substrate, wherein the first measurement coil progresses around the path in a first circumferential direction;
- and
- a second measurement coil formed on the substrate, wherein the second measurement coil progresses around the path in a second circumferential direction,
- wherein the first measurement coil and the second measurement coil are interleaved on the substrate.
Dependencies are inferred from the claim text.