Buck-Boost Switched Capacitor Circuit for Continuous Voltage Ratio Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing conversion circuits integrating switched capacitor circuits are limited by the transformation ratio of the switched capacitor unit, restricting the continuous adjustment of the output voltage and limiting their universality.
Innovation Solution
A conversion circuit combining a buck-boost unit and a switched capacitor unit, allowing for continuous adjustment of the transformation ratio by performing both buck and boost conversions, with the buck-boost unit receiving an input voltage and providing it to the switched capacitor unit for further boost conversion, enabling output voltages between the input voltage and N times the input voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a switched capacitor circuit is used for voltage conversion, then the circuit achieves high efficiency and small size, but the transformation ratio is limited to integers and cannot be continuously adjusted
Solution Approach 1:
The patent combines a buck circuit and a switched capacitor circuit into a single conversion circuit. The buck circuit provides continuous transformation ratio adjustment capability, while the switched capacitor circuit maintains high efficiency and compact size. This merging allows the overall circuit to achieve both continuous transformation ratio adjustment and high conversion efficiency.
Solution Approach 2:
The conversion circuit is designed to perform multiple functions: it can operate in buck mode for step-down conversion, in boost mode for step-up conversion, and in pass-through mode for direct transmission. This multi-functionality enables continuous transformation ratio adjustment across a wide range while maintaining the advantages of the switched capacitor circuit.
2Adaptability or versatility
If the conversion circuit operates in both buck and boost modes, then the output voltage range is expanded, but the circuit complexity increases
Solution Approach 1:
The patent divides the conversion circuit into distinct functional modules: a buck conversion module with its own switching transistor and diode, and a switched capacitor module with its switching transistors and capacitors. This segmentation allows each module to operate independently in different modes, enabling expanded output voltage range while keeping the overall circuit structure organized and manageable.
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 conversion circuit supports a wider range of output voltages, enhancing the universality and efficiency of voltage conversion by allowing continuous adjustment of the transformation ratio beyond the limitations of the switched capacitor unit.
Implementation Method 1
a first inductor L1, a first switching transistor Q8, a second switching transistor Q9, a first diode D1, and a second diode D2... One terminal of the first inductor L1 is connected to a high potential input terminal i+ of the conversion circuit, and the other terminal of the first inductor L1 is connected to each of an anode of the first diode D1, a first electrode of the first switching transistor Q8, and a first electrode of the second switching transistor Q9
Implementation Method 2
a switched capacitor unit... a plurality of conversion capacitors... The plurality of conversion switching transistors may be used to control the plurality of conversion capacitors to be periodically charged and discharged, thereby implementing boost conversion
Data Source
AI summary
A conversion circuit includes a buck-boost unit and a switched capacitor unit. The buck-boost unit may perform buck conversion or boost conversion on a received first input voltage, use a first input voltage obtained after the buck conversion or boost conversion as a forward voltage, and provide the forward voltage for the switched capacitor unit. The switched capacitor unit may perform boost conversion on the forward voltage, and output a forward voltage obtained after the boost conversion as a first output voltage. The conversion circuit may support continuous adjustment of a transformation ratio, and a maximum transformation ratio of the conversion circuit is not limited by a transformation ratio of the switched capacitor unit. The first output voltage of the conversion circuit may be any voltage not less than the first input voltage.