Wireless Charger Data Transmission via Dynamic Output Current Control
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Solution Overview
Problem
Wireless chargers face challenges in achieving normal data communication when the driving current of the load is low, leading to difficulties in demodulating signals due to minimal variation in current amplitude, requiring complex and costly circuits to compensate.
Innovation Solution
The method involves setting the output current of the wireless charger to a preset value during data transmission, actively boosting it to maintain a higher current amplitude variation on the inductive elements, ensuring smooth demodulation, and resuming the current to the driving current level after transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the output current of the wireless charger is low (consistent with driving current of the load), then energy efficiency is improved, but the variation in amplitude of current on inductive element becomes minimal making signal demodulation difficult
Solution Approach 1:
The wireless charger dynamically adjusts the output current based on operational phase: during data transmission, the output current is increased to a preset value to ensure sufficient current variation for reliable signal demodulation, while during normal charging operations, the output current maintains consistency with the driving current of the load to optimize energy efficiency. This dynamic adjustment resolves the contradiction by adapting the current level to the specific operational requirements.
2Reliability
If the output current is increased to maintain higher current amplitude variation for signal demodulation, then signal demodulation reliability is improved, but energy consumption increases
Solution Approach 1:
The wireless charger implements periodic current boosting only during data transmission phases rather than maintaining high current continuously. The control circuit detects when data transmission is required and temporarily increases the output current to the preset value, then resumes normal current levels afterward. This periodic action ensures reliable signal demodulation during communication while minimizing energy consumption during non-communication periods.
3Reliability
If sophisticated and expensive circuits are implemented for signal demodulation, then signal demodulation capability is improved, but device complexity and cost increase
Solution Approach 1:
Instead of implementing sophisticated demodulation circuits, the invention changes the operating parameter (output current level) to ensure sufficient current amplitude variation during data transmission. By maintaining a preset current value during communication, the system ensures that the natural current variation on the inductive elements is adequate for simple demodulation circuits to function reliably, thereby avoiding the need for complex and expensive demodulation hardware.
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
This approach enables successful data demodulation without increasing circuit complexity or cost, maintaining normal communication even at low driving currents, while minimizing impact on charging characteristics by only boosting current during data transmission.
Implementation Method 1
the wireless charger typically transmits power from a transmitter to a receiver through coupling over a magnetic field between the primary and secondary windings of the transformer
Implementation Method 2
modulate the amplitude of current or voltage on an inductive element of a data signal transmitter and to transmit data, and through coupling over a magnetic field
Data Source
AI summary
A method for transmitting data and a wireless charging equipment using the same are disclosed. When the wireless charger transmits data, an output current of the wireless charger is controlled at a preset current value so that there is a higher variation in amplitude of a current or a voltage on an inductive element to thereby enable a signal receiver to demodulate the signal. At the end of data transmission, the output current is resumed consistent with a driving current of the load at the moment. The present disclosure can address the problem of impossible normal communication in the wireless charger at the circumstance of a very low driving current of the load without any increase in cost and complexity of the circuit.