Reconfigurable Charger Feedback Circuit for Adapter Compatibility
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Solution Overview
Problem
The complexity and cost of charger circuits in portable electronic devices increase due to the variety of power adapters and batteries, leading to user frustration and degraded experience, as they require specific configurations for different DC input voltages and charging voltages.
Innovation Solution
A charger circuit with a feedback circuit that selects an error signal, a damping circuit with adjustable gain and impedance, and a voltage-clamping circuit to reduce transients during transitions between feedback sources, allowing for flexible operation across different power adapters and batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charger circuit is designed to support multiple power adapters and batteries with different voltages, then the adaptability and versatility improve, but the device complexity and cost increase
Solution Approach 1:
The patent implements dynamic reconfiguration of the feedback circuit by selectively connecting different feedback sources (voltage feedback, current feedback, dual-feedback) based on operating conditions. This allows the charger to adapt to various power adapters and batteries without requiring multiple fixed circuits, thereby improving versatility while controlling complexity through dynamic switching rather than static multiplicity
Solution Approach 2:
The feedback circuit is designed to perform multiple functions by integrating voltage feedback, current feedback, and dual-feedback capabilities in a single reconfigurable structure. This universal feedback mechanism can handle different charging scenarios (constant voltage, constant current, or combined modes) without requiring separate dedicated circuits for each function, thus improving adaptability while managing device complexity
2Manufacturing precision
If the feedback circuit is configured for specific DC input voltages and charging voltages, then the manufacturing precision and reliability improve, but the adaptability deteriorates
Solution Approach 1:
The feedback circuit dynamically adjusts its configuration based on the detected power adapter voltage and battery charging requirements. By selectively activating appropriate feedback sources and reconfiguring impedance values, the circuit maintains precise voltage regulation across different input voltages without being locked into a single fixed configuration, thus achieving both manufacturing precision and adaptability
Solution Approach 2:
The patent changes key parameters of the feedback circuit including feedback source selection, amplifier gain, and impedance values based on operating conditions. These parameter adjustments allow the circuit to maintain accurate voltage regulation for specific charging requirements while adapting to different power adapter voltages, resolving the contradiction between precision and versatility
3Adaptability or versatility
If multiple feedback sources are used to handle different charging scenarios, then the adaptability improves, but the device complexity and transient issues worsen
Solution Approach 1:
The feedback circuit uses dynamic switching mechanisms to select among multiple feedback sources (voltage feedback, current feedback, dual-feedback) based on real-time operating conditions. This dynamic selection approach provides charging mode flexibility while avoiding the complexity of simultaneously maintaining all feedback paths active, as only the appropriate feedback source is engaged for each specific charging scenario
4Device complexity
If the feedback circuit is simplified to reduce complexity, then the device complexity decreases, but the ability to handle transitions between feedback sources deteriorates
Solution Approach 1:
The patent incorporates damping circuits and voltage-clamping circuits as protective elements that anticipate and mitigate transient issues before they affect system stability. These cushioning elements are pre-configured to handle potential transitions between feedback sources, ensuring reliable operation during mode changes while keeping the overall feedback circuit structure relatively simple
Data Source
AI summary
During operation, the DC converter and a DC battery charger controller in a charger circuit transitions from a first error signal to a second error signal for use in charging a battery, wherein the first error signal and the second error signal, respectively, correspond to feedback sources in a plurality of feedback sources with a plurality of feedback sources. Then, the DC converter and a DC battery charger controller selects a gain and an impedance to ground of a damping circuit based on the selected second error signal, where the damping circuit applies the gain and the impedance to ground to the second error signal. Moreover, the DC converter and a DC battery charger controller selects one or more clamping voltages of a voltage-clamping circuit based on the selected second error signal, where the voltage-clamping circuit applies the one or more clamping voltages to an output from the damping circuit.