Charging Circuit Error Amplifier Transistor Switch Stability
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Solution Overview
Problem
Conventional charging circuits for solar energy systems experience unstable states due to frequent turning on and off, leading to inefficient power regulation and battery charging.
Innovation Solution
A charging circuit system incorporating a transistor switch and an error amplifier to control the turning-on resistance of the transistor switch based on the voltage difference between the power source and load terminals, maintaining the voltage difference above a reference level to prevent unstable states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional charging circuit uses a comparator to control the PMOS field effect transistor turning on and off based on voltage difference thresholds, then the charging power source can be controlled to charge the battery, but the circuit enters an unstable state with frequent on-off cycling when the voltage difference fluctuates near the thresholds
Solution Approach 1:
The patent introduces an error amplifier that continuously monitors the voltage difference between the power source terminal and load terminal, and dynamically adjusts the gate voltage of the transistor switch based on this feedback. This closed-loop feedback mechanism replaces the open-loop comparator control, ensuring the voltage difference remains above the reference level and preventing frequent on-off cycling, thus resolving the instability issue.
2Productivity
If the transistor switch turning-on resistance is kept low to allow efficient power transfer, then charging efficiency improves, but the voltage difference between power source and load terminals drops, causing the comparator to incorrectly trigger turn-off
Solution Approach 1:
The patent dynamically changes the transistor switch's turning-on resistance parameter based on operating conditions. The error amplifier adjusts the gate voltage to optimize the resistance value, maintaining it low enough for efficient power transfer during normal operation but increasing it when the voltage difference approaches the reference level, thus preventing incorrect trigger-off while maintaining charging efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system stabilizes the charging process by dynamically adjusting the transistor switch's resistance, preventing frequent on-off cycles and ensuring consistent battery charging.
Implementation Method 1
the error amplifier has a first input end, a second input end and an output end, the first input end coupling with the power source terminal, the second input end coupling with the load terminal, and the output end coupling with the gate terminal for controlling the turning-on resistance of the transistor switch in accordance with a voltage difference between the power source terminal and said load terminal
Implementation Method 2
the transistor switch has a power source terminal coupling with the charging power source, a load terminal coupling with the battery, and a gate terminal
Data Source
AI summary
A charging circuit with an application system thereof provides an error amplifier to control a transistor switch for controlling the charging power source to charges the battery. When the voltage difference between the power source and load terminals of the transistor switch drops along with the transistor switch being turned on, the output voltage of the error amplifier changes as well to increase the turning-on resistance of the transistor switch such that the voltage difference between the power source and load terminals is capable of maintaining at a value above a certain reference level for avoiding the unstable state resulting from the charging circuit being turned on and off frequently.