Ratiometric Sensor Circuit With Inverse Amplification Control
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Solution Overview
Problem
Ratiometric sensors, such as Hall sensors, are limited to a narrow operation voltage range, and operating outside this range can result in non-ratiometric output signals or sensor failure, making it difficult to use them with varying supply voltages.
Innovation Solution
An electric circuit with an operation voltage amplifier, signal amplifier, and control unit that adjusts voltage and signal amplification factors inversely to each other, allowing the sensor to operate within a wider voltage range while maintaining a ratiometric relationship between the output signal and supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the supply voltage is increased to extend the operation voltage range, then the sensor can operate with higher voltages, but the output signal becomes non-ratiometric or the sensor may fail
Solution Approach 1:
The patent introduces an operation voltage amplifier as an intermediary component between the voltage source and the ratiometric sensor. This amplifier mediates the voltage transmission by adjusting the voltage amplification factor to ensure the sensor receives voltage within its allowable range even when the supply voltage varies, thus preventing sensor failure and maintaining reliable operation
Solution Approach 2:
The patent changes the parameter of voltage amplification factor of the operation voltage amplifier in response to supply voltage variations. By dynamically adjusting this parameter, the system maintains the sensor operating voltage within the safe range, preventing non-ratiometric output and sensor damage while extending the effective operation voltage range
2Reliability
If the operation voltage is stabilized within a narrow range, then the sensor output remains ratiometric, but the circuit cannot adapt to varying supply voltages
Solution Approach 1:
The patent implements a control unit that receives the supply voltage as input and generates control signals for both the operation voltage amplifier and signal amplifier based on this input. This feedback mechanism allows the system to automatically adjust amplification factors in response to supply voltage changes, maintaining ratiometric output characteristics while adapting to a wider supply voltage range
Solution Approach 2:
The patent makes the voltage amplification factor and signal amplification factor dynamic parameters that are adjusted in real-time based on the supply voltage. This dynamic adjustment allows the circuit to maintain stable sensor operation and ratiometric output characteristics while adapting to varying supply conditions, transforming static amplification into a responsive, adaptive system
3Power
If the voltage amplification factor is increased to compensate for lower supply voltage, then the sensor receives adequate operation voltage, but the output signal amplification must be reduced to maintain ratiometric relationship
Solution Approach 1:
The control unit uses feedback from the supply voltage to automatically coordinate the adjustment of both voltage amplification factor and signal amplification factor. This feedback control simplifies the management of dual amplification factors by providing automatic, coordinated adjustment based on supply voltage conditions, reducing the complexity of manual tuning and ensuring proper ratiometric relationships
Solution Approach 2:
The patent combines the control functions for voltage amplification and signal amplification into a single control unit that receives supply voltage input and generates coordinated control signals for both amplifiers. This merging of control functions simplifies the overall system architecture and reduces the complexity of managing multiple amplification factors by treating them as an integrated control system
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 the operation of ratiometric sensors beyond their typical voltage range, ensuring the output signal remains ratiometric and consistent with the measurement parameter, effectively extending the allowable operation voltage range.
Implementation Method 1
An exemplary ratiometric sensor is a Hall sensor which can detect the field strength of a magnetic field utilizing the Hall effect
Data Source
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AI summary
An electric circuit for operating a ratiometric sensor comprises an operation voltage amplifier, a signal amplifier and a control unit. The operation voltage amplifier is adapted to generate an operation voltage for the sensor from the supply voltage provided by the voltage source, wherein the ratio of the operation voltage to the supply voltage is determined by a voltage amplification factor. The signal amplifier is adapted to generate an output signal from a signal of the sensor, wherein the ratio of the output signal to the sensor signal is determined by a signal amplification factor. The control unit is adapted to generate a control signal for the setting of the voltage amplification factor and of the signal amplification factor in depend-ence on the supply voltage. The voltage amplification factor is inversely proportional to the signal amplification factor.