Switching Mode Charger Buck-Boost Controller
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Solution Overview
Problem
Conventional chargers struggle to maintain high charging currents for batteries when faced with voltage variations or cable line losses, leading to prolonged charging times.
Innovation Solution
A switching mode charger with a Buck-Boost converter and controller that dynamically adjusts charging current by switching between Buck, Boost, and Buck-Boost modes in response to voltage and current changes, ensuring efficient charging even under varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large charging current is used to reduce charging time, then charging speed is improved, but the charger cannot maintain rated current under voltage variations or cable losses
Solution Approach 1:
The charger dynamically switches between Buck mode, Boost mode, and Buck-Boost mode based on real-time voltage and current conditions. The controller monitors input voltage, output voltage, and current to determine the appropriate operating mode, enabling the system to adapt to varying cable losses and voltage drops, thereby maintaining stable rated current output for fast charging.
Solution Approach 2:
The charger changes its operating parameters by switching between different conversion modes (Buck, Boost, Buck-Boost) in response to detected voltage and current conditions. This parameter switching allows the charger to compensate for cable losses and voltage variations, ensuring the output current remains at the rated level for effective fast charging.
2Reliability
If a Buck-Boost converter with mode switching is implemented, then charging current stability is improved, but device complexity increases
Solution Approach 1:
The Buck-Boost converter is designed to perform multiple functions by operating in three distinct modes: Buck mode for voltage reduction, Boost mode for voltage increase, and Buck-Boost mode for combined operation. This multi-functionality allows a single converter structure to handle various voltage and current conditions, reducing the need for separate circuits while maintaining current stability.
Solution Approach 2:
The patent combines Buck and Boost conversion capabilities into a single Buck-Boost converter circuit. By merging these functions and using a unified controller to manage mode switching, the design reduces overall system complexity compared to using separate Buck and Boost converters, while achieving reliable current output stability under varying conditions.
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 charger effectively reduces charging time by maintaining a high charging current, supporting various input sources and voltages, and enabling fast charging even with voltage differences or cable line losses.
Implementation Method 1
The Buck-Boost converter is used for generating a voltage at the input terminal according to a voltage at the output terminal or generating a voltage at the output terminal according to a voltage at the input terminal
Data Source
AI summary
A switching mode charger capable of performing mode switching to adjust and output charging current for a battery or driving current for an external circuit element includes an input terminal, an output terminal, a Buck-Boost converter, and a controller. The Buck-Boost converter generates a voltage at the input terminal according to a voltage at the output terminal or generates a voltage at the output terminal according to a voltage at the input terminal. The controller dynamically selects an operation mode from a plurality of operation modes as an operation mode of the Buck-Boost converter according to at least one of the voltage change and the current change that are associated with the Buck-Boost converter, wherein the Buck-Boost converter dynamically performs mode switching according to the operation mode selected by the controller so as to adjust and output the charging current or the driving current.