Switching Charger Feedback Circuit for Stable High-Power Supply
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Solution Overview
Problem
Conventional switching chargers struggle to supply sufficient voltage to electronic products when high power is required due to the inability of their switch components to switch quickly.
Innovation Solution
The proposed switching charger includes a switch circuit, operational amplifiers, selector circuits, and a control circuit, which work together to quickly switch and stabilize voltage and current signals, enabling efficient power supply even at high power demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional switch components are used in the switching charger, then the device complexity is reduced, but the switching speed is insufficient and cannot supply sufficient voltage when high power is required
Solution Approach 1:
The control signal generation is segmented into multiple operational amplifiers (first, second, third, and fourth operational amplifiers) that process different aspects of the switching control independently. This segmentation allows each operational amplifier to handle specific signal conditioning tasks, achieving faster overall switching response while distributing the complexity across multiple specialized components rather than requiring a single complex switching component.
Solution Approach 2:
The patent introduces selector circuits as intermediary components between the operational amplifiers and the switch circuit. These selector circuits mediate the control signals, selecting appropriate feedback signals from multiple operational amplifiers based on operating conditions. This intermediary layer enables faster switching by pre-processing and preparing multiple control signal options before they reach the switch components, reducing the burden on the switch components themselves.
2Power
If the switch circuit switches quickly to supply high power, then the power supply capability is improved, but the voltage and current stability deteriorates
Solution Approach 1:
The patent implements multiple feedback loops through the first, second, third, and fourth operational amplifiers. Each operational amplifier monitors different aspects of the power supply (input voltage, output voltage, current) and feeds back control signals to the selector circuits and switch circuit. This multi-loop feedback system maintains voltage and current stability even during rapid switching by continuously adjusting control signals based on real-time system state, thereby resolving the contradiction between fast switching and stability.
Solution Approach 2:
The control system dynamically selects between different feedback signals from multiple operational amplifiers using the selector circuits. Depending on the operating conditions (such as power demand levels and system state), the selector circuits dynamically choose the most appropriate control signal. This dynamic adaptation allows the system to optimize between switching speed and stability for different operating scenarios, maintaining stability while enabling high power supply capability when needed.
Data Source
AI summary
A switching charger for supplying stable power is provided. First input terminals of first and fourth operational amplifiers and a second input terminal of a second operational amplifier are connected to a battery. A second input terminal of the first operational amplifier is coupled to a reference voltage. A first input terminal of the second operational amplifier and a second input terminal of the fourth operational amplifier are connected to an inductor. A first input terminal of a third operational amplifier is connected to an input power source. A second input terminal of the third operational amplifier is connected to a system circuit. A first selector circuit is connected to output terminals of the third and fourth operational amplifiers. A second selector circuit is connected to output terminals of the first and second operational amplifiers and the first selector circuit.