Power-Line ID Receiver Circuit for Offset-Stable Battery Pack Detection

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing systems for identifying battery packs in electrically assisted bicycles face issues with incorrect determinations due to variations in current or voltage superimposed on power lines, caused by component differences and changes in current consumption, which are not effectively addressed by current threshold-switching methods.

Innovation Solution

An identification information receiving device that integrates and subtracts input signals to determine binary values based on threshold comparisons, using an integration circuit, subtraction circuit, and binary converter to stabilize the detection of identification information superimposed on current or voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed current threshold is used for receiving identification information, then the device complexity is low, but measurement precision deteriorates due to offset variations from component differences and current consumption changes

Engineering Contradiction:

Improvecircuit complexityVSAvoididentification information detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements dynamic threshold adjustment by introducing a threshold value adjustment circuit that automatically modifies the current threshold based on detected offset variations. This allows the threshold to adapt to changing operating conditions, component differences, and current consumption variations, thereby maintaining high measurement precision without increasing overall device complexity significantly

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs a feedback mechanism where the detected offset is fed back to adjust the threshold value. The threshold value adjustment circuit continuously monitors the offset caused by component variations and current consumption changes, and automatically compensates by adjusting the threshold, creating a closed-loop system that maintains detection accuracy

Inventive Principle:

Principle #23Feedback

2Measurement precision

If multiple load resistors and switches are used to switch current thresholds, then measurement precision improves, but device complexity increases

Engineering Contradiction:

Improvecurrent threshold adaptabilityVSAvoidcircuit scale

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Instead of using multiple discrete load resistors and switches, the patent changes the threshold parameter dynamically through a threshold value adjustment circuit that modifies the threshold based on detected offset variations. This approach achieves the same adaptability as multiple fixed thresholds but with a simpler, more scalable circuit implementation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical switching system (multiple resistors and physical switches) with an electronic threshold adjustment mechanism. This substitution eliminates the need for multiple discrete components and mechanical switching, reducing device complexity while maintaining the ability to adapt thresholds to different operating conditions

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Speed

If simple threshold comparison is used, then the processing speed is high, but reliability deteriorates due to incorrect determinations from offset variations

Engineering Contradiction:

Improvedetection speedVSAvoididentification information detection reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent performs preliminary offset detection and threshold adjustment before the actual identification information detection. By pre-adjusting the threshold based on detected offsets, the system ensures that subsequent comparisons are performed with an optimized threshold, preventing incorrect determinations while maintaining high detection speed during the actual identification process

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250316159A1Identification information receiving device, electricity storage pack, identification information receiving method, identification information receiving program, and recording medium storing program

Publication Date: 2025.10.09 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

In an identification information receiving device that receives identification information defined by a plurality of bits and superimposed on a current or a voltage of a power line by an identification information transmitting device that is connected to the identification information receiving device via the power line, an integration circuit integrates an input signal that indicates a voltage value corresponding to the current or the voltage of the power line. A subtraction circuit subtracts an output signal of the integration circuit from the input signal. A binary converter determines “1” when an output signal of the subtraction circuit is greater than or equal to a threshold value, and determines “0” when the output signal of the subtraction circuit is less than the threshold value.