Wireless Parallel Charging Current Balance via Feedback Control
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Solution Overview
Problem
Conventional battery charging systems face inefficiencies and instability due to high variations in input voltage and current during wireless charging, particularly with buck converter topologies, which can destabilize the charging process and limit the performance of charge pump power converters.
Innovation Solution
A battery charging circuit incorporating a buck converter and a charge pump power converter, along with an external or internal sensor and control unit, senses total input current and adjusts the duty cycle of the buck converter to maintain current balance and compensate for variations, ensuring stable and efficient wireless parallel charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buck converter topology is used for wireless battery charging, then the charging circuit can be implemented, but high variations in input voltage and current occur which destabilize the charging process
Solution Approach 1:
The patent implements a feedback mechanism where a sensor detects the total input current to the parallel charging circuit, and a control unit adjusts the duty cycle of the buck converter based on the detected current variations. This closed-loop control compensates for input current variations, stabilizing the charging process and resolving the contradiction between achieving wireless charging and preventing destabilization.
2Productivity
If parallel battery charging is implemented to improve charging speed, then productivity increases, but current balance between charging paths becomes difficult to maintain
Solution Approach 1:
The patent uses a sensor to detect the total input current shared by the parallel charging paths (buck converter and charge pump). The control unit dynamically adjusts the buck converter's duty cycle based on this feedback to maintain current balance between the parallel paths, enabling fast charging while preventing current imbalance that would otherwise occur in parallel configurations.
Solution Approach 2:
The patent implements dynamic control of the buck converter's duty cycle in response to real-time current conditions. This dynamic adjustment allows the system to adapt to varying load conditions and maintain optimal current distribution across parallel charging paths, resolving the contradiction between high-speed charging and current balance stability.
Data Source
AI summary
A battery charging circuit includes a buck converter, a charge pump power converter, a sensor external to or internal to the battery charging circuit, and a control unit. The charge pump power converter includes an output coupled to an output of the buck converter for charging a battery. The sensor is configured to sense a total input current. The control unit receives the total input current that is sensed and compensates for a variation in an input current to the charge pump power converter based on whether the total input current meets a specified current variance.