Dual-Mode Charging Circuit for High Current and Fine Resolution
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Solution Overview
Problem
Existing constant-current charging circuits face challenges in handling a wide range of charging currents from high to low values, leading to difficulties in setting maximum current values without compromising resolution or increasing circuit scale.
Innovation Solution
A circuit device with a first and second charging circuit, both driven by current source circuits, allows switching between charging currents based on detected current values, using a control circuit to manage the switching between the two modes to optimize charging current without increasing circuit scale or reducing resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the maximum value of the charging current is increased in a constant-current charging circuit, then the charging speed is improved, but the resolution of current setting lowers and the circuit scale increases
Solution Approach 1:
The charging circuit is divided into multiple independent charging circuits, each capable of providing a specific current range with high resolution. The control circuit selects and switches between these segmented charging circuits based on the required current value, allowing the system to achieve high maximum current while maintaining high resolution through selective use of appropriate segments.
Solution Approach 2:
The charging circuit implements dynamic switching between different charging circuits based on real-time current requirements. The control circuit dynamically selects which charging circuit to activate, enabling the system to adaptively provide high current when needed while maintaining precision through resolution-based selection, rather than relying on a fixed single-circuit design.
2Productivity
If the maximum value of the charging current is increased, then the charging speed is improved, but the circuit scale increases
Solution Approach 1:
The charging system is segmented into multiple independent charging circuits that can be selectively activated. This allows the circuit scale to remain manageable by only activating the necessary number of charging circuits based on current requirements, rather than requiring all circuits to be simultaneously active or permanently configured at maximum scale.
Solution Approach 2:
Multiple charging circuits share common control infrastructure and can be selectively activated to serve different current requirements. This multi-functional approach allows the same set of charging circuits to handle both low-current precision charging and high-current fast charging scenarios, avoiding the need for separate dedicated circuits for each function.
3Measurement precision
If the resolution of current setting is improved, then the charging accuracy is improved, but the circuit scale increases
Solution Approach 1:
The system segments the current setting range into multiple charging circuits, each optimized for a specific current range with high resolution. This segmentation allows high resolution to be achieved in each segment without requiring the entire system to be scaled up, as only the relevant segment is activated for each charging scenario.
Solution Approach 2:
The system changes the operating parameters by selecting different charging circuits based on the required current resolution. When high resolution is needed, the control circuit activates charging circuits designed for precision current settings, thereby achieving high accuracy without permanently maintaining a large-scale circuit configuration for all possible current values.
Data Source
AI summary
A circuit device includes a current source circuit, a first charging circuit, a second charging circuit, and a control circuit. The first charging circuit supplies a first charging current as a constant current based on an output current of the current source circuit. The second charging circuit supplies a second charging current which is a constant current and is higher than the first charging current based on the output current of the current source circuit. The control circuit makes the first charging circuit supply the first charging current when a current value of the charging current is determined as a current value in the first current mode. The control circuit makes the second charging circuit supply the second charging current when the current value of the charging current is determined as a current value in the second current mode higher than the current value in the first current mode.