Parallel Battery Charging Circuit with Shared Voltage Conversion
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Solution Overview
Problem
Current battery charging technologies face issues with severe battery heating, low charging efficiency, and high costs due to uneven charging currents and large space occupation, especially as portable devices require higher capacity and faster charging.
Innovation Solution
A parallel battery charging circuit that includes a voltage conversion circuit, voltage detection circuit, feedback voltage selection circuit, and charging current control circuits to adjust output voltage and charging current for each battery, ensuring a specified voltage difference and constant current charging, thereby preventing excessive heat generation and optimizing charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple independent voltage conversion circuits are used for each battery, then charging current control precision is improved, but device complexity and space occupation increase
Solution Approach 1:
The patent merges multiple independent voltage conversion circuits into a single shared voltage conversion circuit that serves multiple batteries simultaneously. The voltage detection circuit detects voltages of all batteries, the feedback voltage selection circuit selects the appropriate feedback signal, and the single voltage conversion circuit adjusts the output voltage based on this feedback to maintain precise constant current charging for each battery without requiring separate conversion circuits.
Solution Approach 2:
The single voltage conversion circuit is designed to perform multiple functions by serving N different batteries through dynamic configuration. The circuit can switch between different feedback voltages corresponding to different batteries, allowing one circuit to provide precise charging control for multiple batteries that would traditionally require N separate circuits.
2Area of stationary object
If a single voltage conversion circuit is shared among multiple batteries, then space occupation and cost are reduced, but charging current control precision deteriorates
Solution Approach 1:
The patent implements a sophisticated feedback mechanism where the voltage detection circuit continuously monitors the voltage of each battery, and the feedback voltage selection circuit selects the appropriate feedback signal based on the charging state. The single voltage conversion circuit uses this feedback to dynamically adjust its output, ensuring that each battery receives the precise constant current it needs despite sharing the same conversion circuit with other batteries.
Solution Approach 2:
The system dynamically switches between different feedback voltages corresponding to different batteries based on their charging states. The feedback voltage selection circuit can change which battery's voltage is used as feedback, allowing the single voltage conversion circuit to adapt its output in real-time to maintain precise charging control for each battery throughout the charging process.
3Productivity
If high charging current is applied to increase charging speed, then productivity is improved, but battery heating and energy loss increase
Solution Approach 1:
The patent uses a feedback mechanism where the voltage detection circuit monitors battery voltage and the feedback voltage selection circuit provides this information to the voltage conversion circuit. The conversion circuit continuously adjusts the charging current based on the actual battery state, ensuring optimal charging speed while minimizing energy loss and heat generation by preventing excessive current when the battery is nearly full.
Solution Approach 2:
The system dynamically changes the charging current parameter based on the battery's charging state. By monitoring battery voltage and adjusting the output voltage of the conversion circuit accordingly, the system maintains high charging current when the battery needs it most (when voltage is low) and reduces current as the battery approaches full charge, optimizing both charging speed and energy efficiency.
Data Source
AI summary
The present disclosure provides a parallel battery charging circuit and charging method thereof. The charging circuit includes: a voltage conversion circuit, a voltage detection circuit, a feedback voltage selection circuit, and N charging current control circuits. By forming a differential feedback circuit composed of the voltage conversion circuit, the voltage detection circuit, and the feedback voltage selection circuit, an output voltage is adjusted according to a maximum error result, so that a voltage difference between the output voltage and a battery voltage corresponding to a maximum error result is a specified voltage difference, thereby starting charging from a battery with the lowest voltage.