Parallel Coil Inductive Position Sensor Emission Reduction
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Solution Overview
Problem
Inductive position sensors face challenges in reducing conducted and radiated emissions while maintaining signal strength and accuracy, as existing techniques often result in unintended attenuation of the receive signal and output analog signal amplitude.
Innovation Solution
A sensor configuration with a first coil arranged in parallel with a second coil, along with an oscillator and capacitors positioned between them, allows for increased capacitance without falling below a resonance frequency threshold, thereby enhancing filtering of harmonic frequencies and reducing emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If capacitance is increased to filter harmonic frequencies and reduce emissions, then conducted and radiated emissions are reduced, but resonance frequency may fall below the required threshold
Solution Approach 1:
The patent divides the single coil into two separate coils (first coil and second coil) that are arranged in parallel. This segmentation allows the system to achieve lower equivalent inductance while maintaining the resonant frequency above the threshold, enabling the use of higher capacitance values for effective harmonic filtering without compromising frequency compliance.
Solution Approach 2:
The patent changes the electrical parameters of the circuit by configuring two coils in parallel instead of using a single coil. This parameter change reduces the equivalent inductance, which in turn allows the resonant frequency to remain above the threshold even with increased capacitance, thereby enabling effective emission filtering.
2Object-generated harmful factors
If coil inductance is decreased to allow higher capacitance for filtering, then harmonic filtering and emission reduction are improved, but signal strength may be attenuated
Solution Approach 1:
By segmenting the coil into two parallel coils, the system achieves lower equivalent inductance for better filtering performance while the parallel configuration maintains adequate signal coupling and energy transfer, thus avoiding significant signal attenuation.
Solution Approach 2:
The patent combines two coils in parallel to achieve the desired electrical characteristics. This merging of components allows the system to benefit from reduced equivalent inductance for filtering while maintaining sufficient signal strength through the combined effect of both coils.
3Device complexity
If a single coil is used in the sensor circuit, then the circuit is simpler, but emission filtering effectiveness is limited
Solution Approach 1:
The patent applies segmentation by dividing a single coil into two separate coils arranged in parallel. This increases the filtering effectiveness for harmonic frequencies while keeping the overall circuit design relatively simple and manageable.
Solution Approach 2:
The patent uses a composite coil configuration where two coils are combined in parallel to create a new electrical structure with superior filtering properties. This composite arrangement provides better emission filtering than a single coil while maintaining practical circuit implementation.
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
This configuration effectively decreases conducted and radiated emissions while maintaining or increasing signal strength, thus improving the accuracy of the inductive position sensor.
Implementation Method 1
A sensor, such as an inductive position sensor, may generate electromagnetic energy. The electromagnetic energy may couple to a portion of the sensor to create conducted emissions or radiate in an associated environment to create radiated emissions.
Implementation Method 2
A third coil may be positioned proximate to at least one of the first coil and the second coil such that upon introduction of current to at least one of the first coil and the second coil, the third coil becomes coupled to at least one of the first coil and the second coil by mutual inductance coupling.
Data Source
AI summary
Coil configurations for sensing devices, and related methods are directed towards a sensor including an inductance-capacitance oscillating circuit. The inductance-capacitance oscillating circuit may include a first coil arranged in parallel with a second coil. The inductance-capacitance oscillating circuit may further include an oscillator in electronic communication with the first coil and the second coil. The first inductance-capacitance oscillating circuit may also include at least one capacitor positioned between the oscillator and at least one of the first coil and the second coil.