Three-Input Amplifier Battery Charging Under System Voltage Limits
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Solution Overview
Problem
Existing battery-driven systems face challenges in controlling charging current and maintaining system voltage when power consumption is high, requiring complex control systems and phase compensation capacitors.
Innovation Solution
A power supply system utilizing a three-input amplifier that controls charging current based on system voltage and a reference limit current, simplifying the configuration by using a three-input amplifier to manage charging current through a charging transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control system that controls charging current and prevents system voltage from decreasing is implemented, then charging current control and system voltage maintenance are improved, but device complexity increases due to requiring multiple control systems and capacitors
Solution Approach 1:
The patent combines two separate control systems (charging current control and system voltage maintenance) into a single integrated control system using one amplifier. The amplifier receives three input signals: charging current detection signal, reference charging current signal, and reference limit current signal (determined according to system voltage). By merging the control functions into one amplifier, the patent reduces device complexity while maintaining reliable system voltage maintenance and charging current control.
2Measurement precision
If separate control systems are used for charging current control and system voltage maintenance, then control precision is improved, but device complexity increases due to requiring multiple capacitors and control circuits
Solution Approach 1:
The patent merges multiple control functions into a single amplifier that processes three input signals simultaneously. The amplifier compares the charging current detection signal with the reference charging current signal, and also considers the reference limit current signal determined by system voltage conditions. This integrated approach maintains precise charging current control while eliminating the need for separate control circuits and capacitors for each function.
Solution Approach 2:
The single amplifier is designed to perform multiple control functions: it controls charging current under normal conditions, prevents system voltage from decreasing below minimum levels, and adjusts charging current accordingly. By making the amplifier multi-functional, the patent achieves precise control for multiple purposes without requiring separate specialized control systems for each function.
Data Source
AI summary
A power supply system includes a regulator, outputting a system voltage; a load, receiving the system voltage to operate; a battery, charged by the system voltage; a charging transistor, receiving the system voltage and controlling a charging current to the battery; and a three-input amplifier, in which three factors including a charging current detection value, a reference charging current, and a reference limit current determined according to a difference between the system voltage and a minimum system voltage are input, and which obtains an output corresponding to a difference between the reference charging current and the charging current detection value when the reference charging current is equal to or less than the reference limit current, and obtains an output corresponding to a difference between the reference limit current and the charging current detection value when the reference charging current exceeds the reference limit current.