Battery Voltage Loop Switching Under High-Current OTG Loads
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Solution Overview
Problem
Consumer electronic devices face performance degradation and potential component damage due to high-current demands, leading to disruptive power-on-reset operations and costly returns.
Innovation Solution
A semiconductor device with a battery voltage loop system that includes a charger controller and power stage, utilizing comparators to manage battery and OTG voltage thresholds, enabling/disabling power delivery based on voltage errors to prevent system voltage drops below safe levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the device attempts to meet high-current demand, then power delivery capability is improved, but system voltage drops below safe levels causing performance degradation and component damage
Solution Approach 1:
The patent implements a feedback mechanism where the charger controller continuously monitors battery voltage and OTG voltage, compares them against threshold values, and adjusts power delivery accordingly. The first comparator monitors battery voltage versus battery voltage threshold, while the second comparator monitors OTG voltage versus OTG voltage threshold, creating closed-loop control that prevents voltage from dropping below safe levels during high-current operation
Solution Approach 2:
The patent dynamically switches between two operational modes based on voltage conditions: a first mode where the charger drives the OTG voltage to meet load demand, and a second mode where the charger drives the battery voltage to maintain safe operating levels. This dynamic adaptation allows the system to optimize power delivery while preventing voltage collapse under varying load conditions
2Reliability
If the device detects decreased voltage and initiates power-on-reset operation, then component safety is protected, but operation is disrupted for extended period requiring user intervention
Solution Approach 1:
The patent takes preliminary action by proactively monitoring voltage levels and preemptively adjusting power delivery before voltage drops trigger a power-on-reset. The charger controller continuously compares voltages against thresholds and switches to protective mode in advance, preventing the voltage collapse that would otherwise necessitate a disruptive reset operation
Solution Approach 2:
The feedback mechanism detects voltage trends and triggers protective action before critical thresholds are breached. By continuously monitoring and comparing voltages against safety thresholds, the system initiates corrective power delivery adjustments in advance, preventing the need for disruptive power-on-reset operations
3Power
If the charger drives OTG voltage to meet load demand, then power delivery to load is improved, but battery voltage may drop causing fault conditions
Solution Approach 1:
The patent implements dynamic mode switching between a first operational mode optimized for load power delivery and a second operational mode optimized for battery voltage maintenance. The charger controller adapts its control strategy in real-time based on the relative voltage errors from two comparators, allowing optimal power delivery while preventing battery voltage from dropping into fault conditions
Data Source
AI summary
Systems and methods for using a battery voltage loop under high-current conditions are described. A method for operating a charger, the method includes setting, by a charger controller, a battery voltage threshold; setting, by the charger controller, an on-the-go (OTG) voltage threshold; computing, by a first comparator, a battery voltage error based on a difference between a battery voltage and the battery voltage threshold; computing, by a second comparator, an OTG voltage error based on a difference between an OTG voltage and the OTG voltage threshold; and selecting, by a loop selector, a battery voltage loop when the battery voltage error is smaller than the OTG voltage error.