Adaptive ADC Noise Reduction Circuit for Variable BMS Environments
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Solution Overview
Problem
Existing noise reduction circuits in battery management systems (BMS) fail to adapt to varying installation environments, leading to reduced accuracy in analog-to-digital converter (ADC) operations due to fixed cutoff frequencies that do not account for changing noise frequencies.
Innovation Solution
A noise reduction circuit with a first and second circuit, each comprising resistors and capacitors, connected in parallel to an ADC, where the second circuit is activated or deactivated based on environmental noise frequencies, allowing adjustable cutoff frequencies through a controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed cutoff frequency is used in the noise reduction circuit, then the circuit structure is simple, but the ADC operation accuracy is reduced in varying environmental noise frequencies
Solution Approach 1:
The patent applies the dynamics principle by making the cutoff frequency adjustable rather than fixed. The noise reduction circuit includes a first circuit with a first capacitor and a second circuit with a second capacitor that can be selectively connected in parallel with the first capacitor through switches. This allows the cutoff frequency to be dynamically changed based on environmental noise conditions, resolving the contradiction between simple circuit structure and ADC operation accuracy in varying environments.
Solution Approach 2:
The patent applies the parameter changes principle by changing the capacitance parameter of the RC filter to adjust the cutoff frequency. By connecting the second capacitor in parallel with the first capacitor, the total capacitance increases, which changes the cutoff frequency parameter. This allows the noise reduction circuit to adapt to different environmental noise frequencies while maintaining a relatively simple circuit structure, thereby improving ADC operation accuracy without excessive complexity.
2Measurement precision
If the second capacitor is connected in parallel with the first capacitor, then the cutoff frequency is adjusted for better noise reduction, but the circuit complexity increases
Solution Approach 1:
The patent applies the segmentation principle by dividing the noise reduction circuit into a first circuit with the first capacitor and a second circuit with the second capacitor. The second circuit can be selectively activated or deactivated through switches controlled by the microcontroller. This segmentation allows the system to use only the necessary circuit components for the current noise conditions, achieving effective noise reduction while keeping the actual circuit complexity low during operation.
Solution Approach 2:
The patent applies the universality principle by designing the second circuit to serve multiple functions: it can be connected in parallel with the first capacitor to adjust the cutoff frequency, and it can be selectively activated or deactivated based on environmental noise conditions. The switches and microcontroller enable the circuit to adapt to different noise scenarios, making the circuit configuration universally applicable to various noise environments without requiring multiple separate circuits.
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 variable control of cutoff frequencies to enhance ADC performance and low-frequency noise reduction, improving the accuracy and adaptability of BMS operations.
Implementation Method 1
a first circuit including at least one resistance element and a first capacitor, and connected to an analog-to-digital converter; and a second circuit connected in parallel with the first capacitor
Implementation Method 2
a noise cutoff frequency generated by the first circuit and the second circuit is adjusted
Data Source
AI summary
A noise reduction circuit may comprise a first circuit including at least one resistance element and a first capacitor, and connected to an analog-to-digital converter; and a second circuit connected in parallel with the first capacitor and connected to the analog-to-digital converter through one or more input/output pins, wherein the second circuit is activated or deactivated according to control of the analog-to-digital converter, so that a noise cutoff frequency generated by the first circuit and the second circuit is adjusted.