Electronic Atomizer Voltage Measurement Circuit Without ADC Capacitor Arrays
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Solution Overview
Problem
Existing measurement schemes for electronic atomizers are costly and limited by low accuracy due to the need for numerous capacitive devices, which occupy significant chip area and increase manufacturing costs.
Innovation Solution
A measurement circuit comprising a comparison unit, an accumulation and subtraction unit, and a control unit that adjusts voltage differences between input terminals using resistor series units and switch arrays to calculate voltage resolution, reducing the impact of errors from constant current sources and resistors, and ensuring accurate measurement of to-be-measured voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If successive approximation ADC is used for measuring voltage and resistance, then measurement capability is provided, but large quantity of capacitive devices are needed which occupy large chip area and increase measurement costs
Solution Approach 1:
The patent extracts the measurement function from a conventional ADC and implements it using a simplified circuit consisting of a comparison unit, accumulation and subtraction unit, and resistor series units. This removes the need for large capacitive devices while maintaining measurement capability through voltage comparison and digital counting mechanisms.
Solution Approach 2:
The patent creates a simplified functional copy of ADC measurement capability using basic circuit elements (comparators, resistors, switches) that replicate the voltage-to-digital conversion function without requiring the complex capacitive array structure of traditional ADCs, thereby reducing chip area.
2Measurement precision
If successive approximation ADC is used for measuring voltage and resistance, then measurement capability is provided, but measurement costs increase due to large quantity of capacitive devices
Solution Approach 1:
The patent replaces expensive, complex capacitive devices with simpler, cheaper circuit elements such as comparison units, accumulation and subtraction units, and resistor series. These simpler components reduce manufacturing costs while providing equivalent measurement functionality through alternative physical principles.
Solution Approach 2:
The measurement function is extracted from the expensive ADC architecture and implemented using cost-effective basic circuit components, eliminating the need for large quantities of costly capacitive devices while maintaining measurement capability.
3Measurement precision
If conventional measurement scheme with ADC is used, then voltage and resistance measurement is enabled, but measurement accuracy is limited
Solution Approach 1:
The measurement process is segmented into distinct functional units: a comparison unit for voltage comparison, an accumulation and subtraction unit for digital counting, and resistor series units for voltage division. This segmentation allows each unit to be optimized independently, improving overall measurement accuracy while managing complexity through modular design.
Solution Approach 2:
The accumulation and subtraction unit provides feedback control by continuously adjusting the digital count based on the comparison unit's output, enabling precise measurement through iterative refinement of the measured value and improving accuracy beyond conventional ADC limitations.
Data Source
AI summary
A measurement circuit and a measurement method for measuring and updating a voltage resolution of an electronic atomizer circuit are provided. In the measurement circuit, a comparison unit is configured to compare a first preset value and a second preset value to obtain a voltage difference, an accumulation and subtraction unit is configured to perform counting according to a comparison result, and a control unit is configured to adjust the voltage difference between two compared voltage input terminals, thereby calculating a voltage resolution of the control unit, avoiding the impact of the actual error of the first constant current source and the unit resistor on the actual voltage resolution, and ensuring the measurement accuracy. In addition, an accurate to-be-measured voltage is calculated, and a measurement value of the to-be-measured voltage is corrected, to ensure the high measurement accuracy of the to-be-measured voltage and the output power.