Multi-Range Charging Circuit with Corrected Current Conversion
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Solution Overview
Problem
Existing battery charging circuits face challenges in efficiently managing large charging currents, as they often require increased circuit complexity or reduced current setting resolution, particularly when switching between different charging modes.
Innovation Solution
A circuit device with a current source circuit, a first charging circuit for constant current, a second charging circuit for a larger constant current, and a control circuit that adjusts between these based on a current setting value, performing corrections to ensure accurate and efficient charging by optimizing the conversion characteristics of both currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single charging circuit is designed to handle large charging currents, then the maximum charging current capability is improved, but the circuit scale and complexity increase
Solution Approach 1:
The charging circuit is divided into multiple charging circuits (first charging circuit, second charging circuit, etc.), each capable of providing a portion of the total charging current. The control circuit selectively activates appropriate charging circuits based on the required charging current magnitude, thereby achieving high current capability without requiring a single oversized circuit that would increase complexity and scale.
2Measurement precision
If a single charging circuit is designed to handle small charging currents, then the current setting resolution is improved, but the maximum charging current capability decreases
Solution Approach 1:
Multiple charging circuits are designed with different current capabilities, allowing fine-grained current control when operating at lower currents (improving resolution) while still achieving high maximum current by activating multiple circuits in parallel when needed.
Solution Approach 2:
The charging system is designed to handle multiple current ranges using the same set of charging circuits through selective activation. The control circuit intelligently selects which charging circuits to activate based on the required current level, making the system universally capable of both precision low-current charging and high-current charging.
3Adaptability or versatility
If multiple charging circuits are used to cover different current ranges, then both large and small current capabilities are improved, but the device complexity increases
Solution Approach 1:
The control circuit receives feedback about the required charging current and selectively activates appropriate charging circuits. This feedback mechanism allows the system to automatically adapt to different current requirements without manual intervention, managing the complexity of multiple circuits through intelligent control rather than simple switching.
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 control circuit supplies, when a current setting value is in a first current range, a first charging current of a current value indicated by a first setting value from the first charging circuit to a charging node. The control circuit supplies, when the current setting value is in a second current range, a second charging current of a current value indicated by a second setting value from the second charging circuit to the charging node. The control circuit performs at least one of first correction for correcting a first conversion characteristic and second correction for correcting a second conversion characteristic.