Power-Line ID Receiver Using Edge Detection for Battery Pack Signals
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Solution Overview
Problem
Existing systems for identifying battery packs in electrically assisted bicycles face errors in detecting identification information superimposed on power lines due to variations in current or voltage caused by component differences and changes in current consumption, leading to incorrect determinations.
Innovation Solution
An identification information receiving device that includes an edge detector and a T flip-flop circuit to detect edges of the input signal, inverting the output each time an edge is detected, thereby reducing errors in identifying information superimposed on the power line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If identification information is superimposed on current or voltage of power line, then wireless communication function is eliminated and terminal for communication line is removed, but variations in component characteristics and changes in current consumption add offsets to measured values causing incorrect detection
Solution Approach 1:
The patent introduces a Schmitt trigger circuit as an intermediary between the power line signal and the identification information detection system. This circuit includes a differentiating circuit and a hysteresis comparator that conditions the signal, eliminating the need for separate communication terminals while ensuring accurate detection despite component variations and current consumption changes.
Solution Approach 2:
The Schmitt trigger circuit changes the signal parameters by applying hysteresis with different threshold values (Vr1 and Vr2). This parameter transformation allows the system to detect identification information accurately by comparing against multiple thresholds rather than a single threshold, compensating for offsets caused by component characteristics and current consumption variations.
2Measurement precision
If Schmitt trigger circuit uses first threshold value Vr1 and second threshold value Vr2 for signal detection, then signal shaping is improved, but noise above Vr1 or below Vr2 causes output signal inversion at unintended timing leading to incorrect detection
Solution Approach 1:
The differentiating circuit performs preliminary action by processing the input signal before it reaches the hysteresis comparator. This preliminary differentiation sharpens the signal edges and prepares the signal for threshold comparison, reducing the impact of noise that might otherwise cause incorrect detections at the threshold levels.
Data Source
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 edge detector detects an edge of an input signal that indicates a voltage value corresponding to the current or the voltage of the power line. A T flip-flop circuit inverts an output, each time the edge of the input signal is detected.