Battery Charger IC Digital Interface Gas Gauge Integration
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Solution Overview
Problem
Existing power management integrated circuits (ICs) in portable devices require complex temperature monitoring and battery health tracking, leading to increased pin count and complexity, which hinders the integration of compact battery charging solutions in smaller devices like smartphones and tablets.
Innovation Solution
A battery charger IC chip with an on-chip interface to a separate power source and a digital communication interface with a gas gauge circuit, allowing the charger to rely on the gas gauge for voltage and current limits, eliminating the need for dedicated temperature monitoring and reducing the number of pins required, while the gas gauge computes updated charging profiles based on real-time battery parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power management IC includes dedicated temperature monitoring circuitry and complex battery health tracking, then battery charging safety and reliability are improved, but the pin count and device complexity increase
Solution Approach 1:
The patent combines the temperature sensor and gas gauge circuit into a single integrated unit that is directly coupled to the battery pack. This integration eliminates the need for separate temperature monitoring pins in the power management IC, as the combined unit provides both temperature monitoring and battery health tracking functions through a unified interface.
Solution Approach 2:
The gas gauge circuit is designed to perform multiple functions: it tracks battery health metrics, monitors temperature through the integrated sensor, and provides charging profile management. This multi-functional approach replaces what would traditionally require separate dedicated circuitry for each function, reducing the overall pin count and complexity of the power management IC.
2Manufacturing precision
If the power management IC integrates comprehensive battery monitoring and control functions, then charging control precision is improved, but the IC size and complexity increase
Solution Approach 1:
The patent divides the battery management system into two distinct functional components: the power management IC that handles charging control, and the integrated gas gauge circuit that handles monitoring and health tracking. This segmentation allows each component to be optimized independently, with the power management IC maintaining precise charging control while the gas gauge circuit handles the complex monitoring tasks.
Solution Approach 2:
The integrated gas gauge circuit acts as an intermediary between the battery pack and the power management IC. It receives raw data from the temperature sensor and battery terminals, processes this information to determine charging profiles, and communicates the appropriate parameters back to the power management IC for execution. This intermediary approach enables precise charging control without requiring the power management IC to directly handle all monitoring complexity.
3Measurement precision
If separate temperature sensor and gas gauge circuit are used with dedicated signal wires, then measurement accuracy is improved, but the number of connections and pin count increase
Solution Approach 1:
The patent merges the temperature sensor and gas gauge circuit into a single integrated unit that is directly coupled to the battery pack. This combination allows both temperature monitoring and battery health tracking to be performed through a unified interface, eliminating the need for separate dedicated signal wires for each function and reducing the overall connection count between the battery pack and power management IC.
Data Source
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AI summary
An on-chip digital communication interface circuit is to be directly coupled to a counterpart interface circuit of a separate battery-side gas gauge circuit. An on-chip battery charging control circuit controls battery charging voltage and current that is supplied from a separate power source interface circuit to a battery cell terminal, according to charging voltage and current limits. The charging limits are read from the gas gauge circuit and in effect carry out a selected one of several different battery charging profiles. Other embodiments are also described and claimed.