Voltage Filtering Verification for Switch State Detection

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Solution Overview

Problem

Existing voltage filtering methods for detecting points in circuits, particularly in new energy vehicle charging bases, fail to verify the effectiveness of voltage filtering, leading to inaccurate and unreliable switch state detection due to voltage jitter, which compromises the reliability and accuracy of subsequent control or detection.

Innovation Solution

A method and apparatus that involve continuously collecting multiple voltage data, applying various filter modes to obtain filtering values, comparing these values, and determining a voltage target value based on preset conditions to ensure the validity and reliability of the filtering process, thereby preventing control misjudgment and improving accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single filter circuit is used to filter voltage ripple, then the filtering process is simple, but the effectiveness of voltage filtering cannot be verified

Engineering Contradiction:

Improvefiltering process complexityVSAvoidvoltage filtering effectiveness verification

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent divides the voltage filtering verification into multiple independent filter circuits (first filter circuit and second filter circuit) with different filtering capabilities. Each filter circuit processes the same voltage signal separately, allowing comparison of their outputs to verify filtering effectiveness. This segmentation enables reliability verification while maintaining reasonable complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a feedback mechanism where the outputs of multiple filter circuits are compared against each other and against preset threshold values. This comparison feedback loop verifies whether the filtering meets expected performance criteria, and triggers re-filtering or error handling if verification fails, thereby ensuring reliability.

Inventive Principle:

Principle #23Feedback

2Reliability

If multiple filter modes are applied and compared, then the reliability of voltage filtering is verified, but the device complexity increases

Engineering Contradiction:

Improvevoltage filtering effectiveness verificationVSAvoidfilter circuit configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the filtering function into multiple parallel filter circuits, each implementing a different filter mode (e.g., first filter mode and second filter mode). This segmentation allows comprehensive verification through comparison while keeping each individual filter circuit relatively simple and modular.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes filtering parameters by using different filter modes with different characteristics (e.g., different cutoff frequencies, filtering algorithms, or circuit configurations). By comparing results across these parameter variations, the system verifies filtering reliability without requiring overly complex individual filter designs.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If voltage filtering is not verified, then the system operates simply, but control misjudgment occurs due to voltage jitter

Engineering Contradiction:

Improvesystem operation efficiencyVSAvoidswitch state detection accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent performs preliminary verification of voltage filtering effectiveness before using the filtered voltage for control decisions. By pre-verifying that the filtering meets required standards through multiple filter comparison, the system ensures measurement precision is adequate before proceeding with switch state detection, preventing control misjudgment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback verification where filtered voltage outputs are continuously monitored and compared against expected ranges. This feedback mechanism detects voltage jitter or filtering failures early, allowing the system to correct or re-filter before making control decisions, thereby maintaining both productivity and measurement precision.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4375681B1Voltage filtering method for detecting point in circuit, switch state detecting method, and related apparatus

Publication Date: 2025.11.26 CHANGCHUN JETTY AUTOMOTIVE PARTS CORPORATION

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AI summary

A voltage filtering method for a detecting point in a circuit, a switch state detection method and a related apparatus, which may be used in the technical field of new energy, the voltage filtering method for a detecting point in a circuit including: continuously collecting multiple voltage data of a detecting point in a target circuit; respectively obtaining a plurality of voltage filtering values corresponding to the detecting point by preforming filter modes based on the multiple voltage data; comparing the plurality of voltage filtering values, and if the corresponding comparison result meets a preset condition, determining a voltage target value of the detecting point based on the plurality of voltage filtering values. The present disclosure effectively verifies the validity of the voltage filtering for the detecting point in the circuit, and then ensures the reliability of the voltage filtering for the detecting point, thereby effectively improving the accuracy and reliability of subsequent control or detection according to the filtered voltage.