Portable Charger Communication Circuit With Load Noise Isolation
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Solution Overview
Problem
Existing portable devices face inefficiencies and inaccuracies in power line communication with chargers due to noise interference from electrical loads, leading to suboptimal charging and communication performance.
Innovation Solution
The portable device incorporates a charging circuit with switches that can selectively cut off power to electrical loads during power line communication periods, using battery power instead, thereby reducing noise interference and enhancing communication accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is continuously supplied to electrical loads during charging, then the electrical load can operate without interruption, but noise interference occurs during power line communication
Solution Approach 1:
The patent implements periodic switching between power supply modes: during communication periods, the electrical load is disconnected from charger power and operates on battery power only, enabling noise-free communication. During non-communication periods, the electrical load reconnects to charger power for efficient charging. This periodic action resolves the contradiction by temporally separating communication and power supply functions.
Solution Approach 2:
The patent segments the power supply path into two independent circuits: one for charging (charger to battery) and one for electrical load operation (charger to load). By controlling switches in these segmented paths, the system can independently manage power flow to eliminate noise during communication while maintaining charging functionality.
2Loss of information
If power line communication is performed during charging, then communication between portable device and charger is enabled, but communication accuracy deteriorates due to noise from electrical loads
Solution Approach 1:
The patent extracts the electrical load from the power line communication circuit during communication periods by opening a switch in the load power path. This removal of the noise-generating electrical load from the communication circuit enables accurate power line communication while maintaining the charging function through a separate power path.
3Productivity
If charging efficiency is maximized by continuous power supply, then quick charging is achieved, but communication performance suffers due to ongoing electrical load operation
Solution Approach 1:
The system employs periodic switching between two operational states: a charging state where the electrical load is disconnected and the battery charges at high efficiency from the charger, and a communication state where the load is also disconnected but power flows only for communication purposes. This periodic action achieves both high charging efficiency and reliable communication by ensuring the load is disconnected during both operations.
Data Source
AI summary
A portable device includes: a modem configured to perform power line communication with a charger external to the portable device; and a charging circuit configured to, from first power provided by the charger, charge a battery and supply power to an electrical load, wherein the charging circuit is further configured to cut off the supply of the first power to the electrical load and supply second power from the battery to the electrical load.