Remote Voltage Sensor Using Magnetic Field Induction
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Solution Overview
Problem
Existing remote voltage measurement circuits face challenges with substantial common mode voltage differences, requiring isolation for safety and operational concerns, and rely on expensive and unreliable optically coupled devices.
Innovation Solution
A remote sensor system comprising a first circuit with a coil and magnetic field generator, and a second circuit with a voltage-to-current converter, where the magnetic field loading is measurable, allowing for non-contact voltage measurement through magnetic field induction and conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optically coupled devices are used for isolated voltage measurement, then isolation protection is achieved, but cost increases and reliability decreases
Solution Approach 1:
The patent replaces the optical coupling system with a magnetic field-based measurement system. Instead of using optically coupled devices that require light transmission through isolation barriers, the invention uses a first coil to generate a magnetic field that induces voltage in a second coil on the remote circuit. This magnetic field coupling provides the necessary isolation protection while eliminating the cost and reliability issues associated with optical components.
Solution Approach 2:
The invention changes the physical parameter used for isolation from optical signals to magnetic field interactions. By using electromagnetic induction between two coils separated by an isolation barrier, the system achieves voltage measurement with isolation protection without the drawbacks of optical coupling devices, thereby reducing cost and improving reliability.
2Reliability
If optically coupled devices are used for isolated voltage measurement, then isolation protection is achieved, but device complexity increases
Solution Approach 1:
The patent replaces the complex optical coupling system with a simpler magnetic field-based measurement system. Instead of using optically coupled devices that require light transmission through isolation barriers, the invention uses a first coil to generate a magnetic field that induces voltage in a second coil on the remote circuit. This magnetic field coupling provides the necessary isolation protection while eliminating the cost and reliability issues associated with optical components.
3Ease of operation
If magnetic field loading measurement is implemented, then non-contact voltage measurement is achieved, but measurement precision requirements increase
Solution Approach 1:
The patent employs feedback mechanisms to improve measurement precision. The system measures the loading effect on the magnetic field and uses this information to correlate and determine the unknown voltage. By implementing feedback loops and correlation algorithms, the system maintains high measurement precision despite the non-contact nature of the measurement, ensuring accurate voltage determination through magnetic field interaction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and reliable non-contact measurement of remote voltages without physical connection, reducing costs and improving reliability by using magnetic field induction and conversion techniques.
Implementation Method 1
a magnetic field generator for driving a current through the first coil to generate a magnetic field... The magnetic field in the first coil induces a voltage in the second coil
Implementation Method 2
a voltage-to-current converter for converting a voltage at an input of the second circuit to current and applying the current to the second coil. The current in the second coil registers as a loading of the magnetic field generated by the first coil
Data Source
AI summary
Remote sensors and methods of remote sensing are disclosed. A remote sensor includes a first circuit and a second circuit. The first circuit includes a first coil, a magnetic field generator for driving a current through the first coil to generate a magnetic field, and circuitry for determining loading of the magnetic field. The second circuit includes a second coil located proximate the first coil and a voltage-to-current converter for converting a voltage at an input of the second circuit to current and applying the current to the second coil. The current in the second coil registers as a loading of the magnetic field generated by the first coil. The loss, in response to the loading of the magnetic field, is measurable by the first circuit.