Switched Capacitor Converter Circuit Parallel Power Transmission
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Solution Overview
Problem
Conventional switched-capacitor converters face inefficiencies and heat dissipation issues when increasing charging current, particularly above 8A, due to serial power transmission and switching transistor losses, which limits their effectiveness in mobile terminals with size constraints.
Innovation Solution
A switched-capacitor converter circuit with N levels of units connected in series and parallel, utilizing a capacitor isolation unit and switched-capacitor topology to achieve a 2:1 voltage gain ratio, reducing power losses and eliminating switching transistor losses on the charging branch, and optionally incorporating inductors for soft switching to minimize losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging current is increased to increase charging speed, then the charging power increases, but the size of the inductor and charging integrated circuit must be increased
Solution Approach 1:
The patent replaces the conventional inductor-based energy storage mechanism with a capacitor-based switched capacitor converter. This substitution eliminates the need for large inductors while achieving the same power conversion function, thereby increasing charging current and speed without proportionally increasing the charging circuit size.
2Power
If a conventional 3:1 type switched capacitor converter is used to increase voltage gain, then the voltage conversion ratio increases, but conversion efficiency decreases due to serial power transmission losses
Solution Approach 1:
The patent divides the voltage conversion function into multiple 2:1 switched capacitor converter units operating in parallel. Each unit handles a portion of the power transmission, avoiding the serial connection losses inherent in conventional 3:1 converters. This segmentation maintains high voltage gain while preserving conversion efficiency.
Solution Approach 2:
The patent combines multiple 2:1 switched capacitor converter units in parallel to achieve the equivalent function of a 3:1 converter. By merging multiple efficient units rather than using a single high-ratio converter, the system achieves high voltage gain without the efficiency penalties of serial power transmission.
3Power
If additional switching transistors are added to increase voltage gain ratio, then the voltage conversion capability improves, but heat dissipation temperature increases
Solution Approach 1:
The patent segments the voltage gain function across multiple parallel 2:1 converter units, each with fewer switching transistors. This distribution reduces the power handling burden and heat generation per transistor compared to a conventional 3:1 converter with more transistors in series, thereby lowering overall heat dissipation temperature.
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
This configuration enhances conversion efficiency and reduces heat dissipation by minimizing power losses and transistor losses, allowing for higher charging currents without increasing overall size or power consumption, thus improving charging speed and battery life in mobile terminals.
Implementation Method 1
a first capacitor C1 and N levels of switched-capacitor converter units 100... each level of which includes a capacitor isolation unit 110 and a switched-capacitor topology 120
Data Source
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AI summary
This application provides a switched-capacitor converter circuit, a charging control system, and a control method. In the switched-capacitor converter circuit, input terminals of N levels of switched-capacitor converter units are sequentially connected in series, and output terminals of the N levels of switched-capacitor converter units are connected in parallel, to obtain a first power supply branch to supply power to a load. In addition, a first capacitor acts as a second power supply branch to supply power to the load, and the first power supply branch and the second power supply branch transmit power in parallel. In comparison with a serial power transmission manner, there are fewer devices on a power transmission path when a parallel power transmission manner is used. Therefore, this can reduce power losses on the transmission path, and improve transmission efficiency of the switched converter circuit.