Electrochemical Sensor Circuit Switching for Low-Power Precision Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrochemical sensors face challenges in maintaining low-power consumption to ensure readiness for use while providing high measurement precision, especially when detecting trace amounts of samples, leading to frequent battery replacement and prolonged stabilization times, which complicates usage and increases costs.
Innovation Solution
A circuit design for electrochemical sensors incorporating a low-power-consumption control circuit to maintain bias voltage when not in operation and a high-performance measurement circuit for operation, utilizing a changeover switch to switch between these circuits, ensuring the sensor is ready for use and providing precise measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-performance operational amplifiers with low noise and high precision are selected for measurement circuits, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent segments the circuit system into two distinct parts: a control circuit using low-power operational amplifiers for bias voltage maintenance, and a measurement circuit using high-performance operational amplifiers for precise signal detection. This segmentation allows each circuit to be optimized for its specific function without compromising the other, resolving the contradiction between power consumption and measurement precision.
Solution Approach 2:
The patent implements dynamic switching between different operational amplifier configurations based on operational state. During standby, low-power operational amplifiers maintain bias voltage; during measurement, high-performance operational amplifiers are activated for precise signal detection. This dynamic adaptation resolves the contradiction by matching circuit performance to actual operational needs.
2Reliability
If bias voltage control circuits are powered by batteries for long-term working to ensure sensors are ready for work, then sensor readiness is improved, but battery life decreases due to high power consumption
Solution Approach 1:
The patent separates the bias voltage control function from the measurement function, assigning each to dedicated circuits with appropriately selected operational amplifiers. The control circuit uses low-power operational amplifiers specifically optimized for maintaining bias voltage during standby, thereby extending battery life while ensuring sensor readiness.
Solution Approach 2:
The patent changes the power consumption parameter of operational amplifiers used in the control circuit by selecting low-power variants specifically for bias voltage maintenance. This parameter optimization allows the circuit to maintain sensor readiness for extended periods on battery power without requiring frequent battery replacements.
3Measurement precision
If high-performance components are used in measurement circuits to detect weak signals from trace amount samples, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the operational amplifier requirements by function: low-power operational amplifiers for control circuit bias voltage maintenance, and high-performance operational amplifiers specifically for measurement circuit signal detection. This segmentation allows high-performance components to be used only where necessary for measuring weak signals from trace samples, minimizing overall device complexity while maintaining measurement precision.
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
The solution effectively reduces battery consumption, prolongs sensor readiness, enhances user convenience, and maintains measurement precision, avoiding frequent battery replacements and stabilization delays.
Implementation Method 1
an oxidation or reduction reaction is carried out on the surface of the working electrode to generate a current
Implementation Method 2
a current which flows through the two electrodes through an external circuit. The generated current is in direct proportion to the concentration of the sample to be tested
Data Source
AI summary
The invention relates to a circuit for an electrochemical sensor and a usage method for the circuit. The circuit includes an electrochemical sensor, a control circuit and a measurement circuit, and a changeover switch is arranged between the control circuit and the measurement circuit. The control circuit provides a bias voltage for electrodes of the electrochemical sensor, is a low-power-consumption circuit, and includes a low-power-consumption operational amplifier. The measurement circuit includes a low-noise and high-precision operational amplifier, and is used to detect signals when the electrochemical sensor is in operation. When the electrochemical sensor is not in operation, the stability of the sensor can be maintained, and the problems that batteries are replaced frequently due to excessively fast power consumption and a long stabilization time is required by the sensor after the batteries are replaced can also be avoided; and when the electrochemical sensor is in operation, low noise and high precision of a measurement result are guaranteed. The circuit has low power consumption and high detection precision, and can be applied to detection, performed by means of the electrochemical sensor, of a gas concentration such as a nitric oxide concentration in expiratory gas.