Electrochemical Sensor Bias Circuit Without Voltage Doublers
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Solution Overview
Problem
Existing electrochemical sensors require a minimum supply voltage of 2V for biasing, which is not sufficient for battery-powered applications, leading to increased power consumption and complexity due to the use of voltage doublers.
Innovation Solution
A control circuitry that adjusts the voltage bias between the working and counter electrodes by varying both the working and counter bias voltages within a single supply voltage range, eliminating the need for voltage doublers and reducing power consumption and circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If voltage doublers are used to achieve sufficient bias voltage swing, then the required supply voltage can be reduced, but power consumption and circuit complexity increase
Solution Approach 1:
The patent changes the operating parameters of the electrochemical cell by dynamically adjusting the bias voltage applied to the working electrode and counter electrode. Instead of using a fixed voltage swing requiring voltage doublers, the system varies the bias voltage parameters within a single supply voltage range to achieve the necessary electrochemical measurements, thereby eliminating voltage doubler circuitry and reducing power consumption
Solution Approach 2:
The patent extracts and removes the voltage doubler circuitry from the system by demonstrating that voltage doubling is not necessary. By directly controlling the bias voltage across the electrochemical cell within the limits of a single supply voltage, the invention eliminates the need for separate voltage doubling circuits,ไป่ reducing overall circuit complexity and power consumption
2Adaptability or versatility
If a minimum supply voltage of 2V is used for biasing electrochemical cells, then sufficient voltage swing is achieved, but battery-powered applications become infeasible
Solution Approach 1:
The patent enables battery-powered applications by dynamically adjusting the bias voltage parameters within a single supply voltage range. The control circuitry varies the working electrode bias voltage and counter electrode bias voltage to achieve the necessary voltage swing for electrochemical measurements without requiring a minimum 2V supply, making the system compatible with low-voltage battery power sources
3Device complexity
If voltage doublers are employed to increase voltage swing, then the bias voltage range is expanded, but circuit size increases
Solution Approach 1:
The patent removes the voltage doubler circuitry entirely by implementing direct bias voltage control. The control circuitry independently adjusts the working electrode and counter electrode biases within a single supply voltage range, eliminating the need for voltage doubling circuits and thereby reducing circuit size while maintaining adequate voltage bias range for electrochemical measurements
Data Source
AI summary
Circuitry for measuring a characteristic of an electrochemical cell, the electrochemical cell comprising at least one working electrode and a counter electrode, the circuitry comprising: driver circuitry configured to apply a working bias voltage to the at least one working electrode and a counter bias voltage at the counter electrode to produce a first voltage bias between the at least one working electrode and the counter electrode; control circuitry configured to adjust the first voltage bias over a first bias range by varying the working bias voltage and the counter bias voltage.