Switching-Type Charging Circuit Input Voltage Zero Dropping
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Solution Overview
Problem
Conventional switching chargers experience power loss and heating issues due to inverse current generated when the input voltage is cut off, leading to a non-zero voltage at the input end, which is not efficiently managed by existing technologies.
Innovation Solution
A switching-type charging circuit incorporating a first switch, current detection unit, switching circuit, control circuit, and discharging unit or comparator, which adjusts the working frequency or generates a discharging current to ensure the input end voltage drops to zero by controlling the inverse current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a switching charger is used to reduce power loss and heating, then energy efficiency is improved, but inverse current is generated when input voltage is cut off causing voltage to remain non-zero
Solution Approach 1:
A discharging unit is introduced as an intermediary component between the battery and the input end of the switching charger. This discharging unit actively discharges the inverse current generated by the battery when input voltage is cut off, preventing the voltage at the input end from remaining non-zero. The discharging unit serves as a mediator that resolves the conflict between maintaining energy efficiency and ensuring proper voltage termination.
2Productivity
If the switching charger operates with higher current to battery, then charging efficiency is improved, but inverse current flows back to input end causing power loss
Solution Approach 1:
The invention converts the harmful inverse current flow into a beneficial controlled discharge process. The discharging unit captures the inverse current that would otherwise cause power loss and heating, and directs it through a controlled path to ground. By converting the harmful reverse current flow into a controlled discharge mechanism, the system maintains high charging efficiency while eliminating the energy waste associated with uncontrolled inverse current.
3Ease of operation
If linear charger is used to ensure simple operation, then ease of operation is improved, but power loss and heating issues occur
Solution Approach 1:
The charging system is segmented into distinct functional modules: the main switching charger circuit for efficient power conversion, and a separate discharging unit for handling inverse current. This segmentation allows the system to maintain the operational simplicity of a standard charger while incorporating advanced energy management capabilities. The discharging unit operates as an independent module that activates only when needed, preserving the overall simplicity of operation while eliminating power loss.
Data Source
AI summary
Disclosed is a switching-type charging circuit including a first switch, a current detection unit, a switching circuit and a control circuit. The current detection unit is connected to the first switch and detects a current flowing through the first switch. The switching circuit is connected to the input end of the switching-type charging circuit through the first switch to receive an input voltage, and correspondingly outputs an output voltage to a battery through an inductor. When the input voltage of the switching-type charging circuit is cut off, an inverse current flowing to the first switch through the switching circuit is generated by the battery, and the control circuit adjusts the working frequency of the switch circuit to make the inverse current lower and become equal to or less than a quiescent current.