Switched Capacitor Converter Topology for Multi-Ratio Voltage Conversion
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Solution Overview
Problem
Existing switched capacitor converters are limited to a voltage conversion ratio of 2:1, which is insufficient for modern mobile systems with increased power consumption and lower operating voltages.
Innovation Solution
A switched capacitor circuit with a complex structure of multiple switches and capacitors, allowing for various voltage conversion ratios through precise switching operations controlled by a switching controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional switched capacitor converter structure is used, then the circuit is simple and easy to manufacture, but the voltage conversion ratio is limited to 2:1 and cannot meet modern mobile system requirements
Solution Approach 1:
The switched capacitor circuit is divided into multiple independent capacitor branches (first capacitor branch with C1, second capacitor branch with C2, third capacitor branch with C3, fourth capacitor branch with C4). Each branch can be independently controlled by its own switch, allowing flexible configuration to achieve different voltage conversion ratios (2:1, 3:1, 4:1, 5:1) without requiring a complete redesign of the circuit structure.
Solution Approach 2:
The circuit structure is designed to perform multiple functions: it can operate as a 2:1 voltage converter, 3:1 voltage converter, 4:1 voltage converter, or 5:1 voltage converter by simply changing the switching states. The same physical circuit components (capacitors C1-C4 and switches SW1-SW4) serve multiple voltage conversion purposes, eliminating the need for separate circuits for each conversion ratio.
2Adaptability or versatility
If the number of switches and capacitors is increased to achieve multiple voltage conversion ratios, then the adaptability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple voltage conversion functions are merged into a single integrated circuit structure. The four capacitor branches and four switches are combined in a unified configuration where the same components serve multiple purposes. For example, capacitors C1 and C2 can work together for 2:1 conversion, while C1, C2, and C3 can work together for 3:1 conversion, eliminating the need for separate circuits for each conversion ratio.
Solution Approach 2:
The circuit employs dynamic switching control to achieve different voltage conversion ratios. The switches SW1-SW4 can be dynamically turned on or off based on the desired conversion ratio, allowing the static physical circuit to perform dynamic voltage conversion functions. This dynamic control approach avoids the need for multiple static circuit configurations.
Data Source
AI summary
A switched capacitor circuit includes first, third, fifth and seventh switches connected to each other, second, fourth, sixth and eighth switches connected to each other, one end of each of the first and second switches connected to an input node, ninth and tenth switches connected to each other, eleventh and twelfth switches connected to each other, thirteenth and fourteenth switches connected to each other, fifteenth and sixteenth switches connected to each other, a first capacitor between the first and ninth switches, a second capacitor between the second and fifteenth switches, a third capacitor between the third and eleventh switches, a fourth capacitor between the fourth and thirteenth switches, a fifth capacitor between the sixth and eleventh switches, and a sixth capacitor between the fifth and thirteenth switches, one end of each of the ninth, eleventh, thirteenth, fifteenth, seventh and eighth switches connected to an output node.