DC-DC Converter with Shared Switch Groups and Magnetic Circuits
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Solution Overview
Problem
Existing DC-DC converters with switched capacitor converters face limitations in achieving a variable transformation ratio and smoothing output voltage due to high pulsation in input current, requiring additional circuit stages that increase the circuit size and complexity.
Innovation Solution
A DC-DC converter design that incorporates a switched capacitor converter with shared switch groups and a unidirectional power converter, utilizing primary magnetic circuits and capacitors to achieve adjustable voltage conversion and smooth output voltage, while reducing circuit size through component sharing and efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a switched capacitor converter is used for voltage conversion, then voltage transformation can be achieved, but the input current pulsation increases and output voltage smoothing becomes difficult
Solution Approach 1:
The patent combines a switched capacitor converter with a switch converter into an integrated DC-DC converter system. The switched capacitor stage performs initial voltage conversion while the switch converter stage handles current smoothing and additional transformation, merging two conversion mechanisms into a unified system that resolves the pulsation issue while maintaining voltage conversion capability.
Solution Approach 2:
The patent introduces an intermediary circuit stage between the switched capacitor converter and the load. This intermediate switch converter stage acts as a mediator that smooths the pulsating current from the switched capacitor stage before delivering power to the load, thereby eliminating the harmful current pulsation while preserving the voltage conversion function.
2Reliability
If additional circuit stages are added to smooth output voltage and achieve variable transformation ratio, then voltage regulation improves, but circuit size and complexity increase
Solution Approach 1:
The patent designs the switch converter stage to perform multiple functions simultaneously: it smooths output voltage, enables variable transformation ratio through duty cycle control, and interfaces with the switched capacitor stage. This multi-functional design achieves voltage regulation and flexibility without proportionally increasing circuit complexity.
Solution Approach 2:
The patent implements a dynamically controllable transformation ratio through PWM control of the switch converter. The duty cycle of the switch converter can be adjusted in real-time to achieve variable voltage transformation ratios, providing adaptability without requiring multiple fixed-ratio circuit stages, thereby maintaining circuit compactness.
3Volume of stationary object
If component sharing is implemented between switched capacitor converter and switch converter, then circuit size reduces, but design complexity increases
Solution Approach 1:
The patent merges the switch groups of the switched capacitor converter with the switch converter, allowing shared switches to perform dual functions. This consolidation reduces the total number of components and circuit size while the unified control architecture manages the shared components, preventing design complexity from increasing proportionally.
Solution Approach 2:
The shared switch groups are designed to serve multiple purposes: they function in both the switched capacitor conversion path and the switch converter path. This universal design allows a single component to fulfill multiple roles, reducing overall circuit size while the control system coordinates their operation to manage design complexity.
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 design allows for adjustable voltage conversion and smoothing of output voltage, reducing circuit size and complexity by sharing switch groups and utilizing primary magnetic circuits, effectively addressing the pulsation issues and achieving efficient power conversion.
Implementation Method 1
at least one primary magnetic circuit and is configured to share at least one of the switch groups, one terminal of the primary magnetic circuit is coupled to an intermediate node of the shared switch group
Data Source
AI summary
A DC-DC converter can include: a switched capacitor converter including at least one switch group and at least one capacitor, where each of the at least one switch group includes two switches are coupled in series, and at least one of the capacitors is coupled in parallel with a corresponding one of the switch groups; and at least one switch converter, where each switch converter includes at least one primary magnetic circuit and is configured to share at least one of the switch groups, one terminal of the primary magnetic circuit is coupled to an intermediate node of the shared switch group, the intermediate node is a common coupling point of two switches of the shared switch group, and the switch converter is an unidirectional power converter.