DC-DC Converter with Shared Switch Group for Adjustable Gain
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Solution Overview
Problem
Conventional DC-DC converters with switched capacitor converters face limitations in achieving a variable transformation ratio and smoothing output voltage due to high pulsation, requiring additional circuit stages that increase the overall circuit size.
Innovation Solution
A DC-DC converter design that combines a switched capacitor converter with a switch converter, sharing a switch group and utilizing a magnetic component to adjust the output voltage, allowing for adjustable gain and reduced pulsation through complementary switch control signals and duty cycle modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a switched capacitor converter is used for voltage conversion, then voltage transformation can be achieved, but the output voltage has high pulsation and the transformation ratio is fixed
Solution Approach 1:
The patent combines a switched capacitor converter with a switch converter in a hybrid configuration. The switched capacitor converter provides voltage transformation while the switch converter with magnetic component smooths output voltage and enables variable transformation ratio. The two converters share common components (switches, capacitors) to achieve both functions simultaneously without requiring separate independent circuits.
Solution Approach 2:
The switch group is designed to serve multiple functions: it operates as part of the switched capacitor converter for voltage transformation and simultaneously as part of the switch converter for output smoothing and gain adjustment. The magnetic component provides both energy storage for smoothing and transformation ratio adjustment capability, making the circuit multi-functional.
2Measurement precision
If additional circuit stages are added to smooth output voltage and enable variable transformation ratio, then output smoothness and adjustability improve, but the circuit size increases
Solution Approach 1:
The patent merges the switched capacitor converter and switch converter into a single integrated circuit stage. They share common switches (Q1, Q2), capacitors (C1, C2), and control circuitry, eliminating the need for separate independent circuits. This integration achieves voltage smoothing and variable transformation ratio without proportionally increasing circuit size.
Solution Approach 2:
Each component in the hybrid converter serves multiple purposes: the magnetic component provides both energy storage for smoothing and transformation ratio adjustment; the switch group performs both voltage transformation and output regulation; the capacitors serve both filtering and energy storage functions. This multi-functionality reduces the total number of components needed.
3Adaptability or versatility
If a hybrid converter combining switched capacitor and switch converter is used, then variable transformation ratio and smooth output are achieved, but device complexity increases
Solution Approach 1:
The patent integrates two converter topologies into a unified circuit structure with shared components. The switch group (Q1, Q2) and capacitors (C1, C2) are commonly used by both the switched capacitor converter and the switch converter, reducing the total component count and simplifying the overall device structure despite the enhanced functionality.
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 enables adjustable gain and smooth output voltage with reduced circuit size by sharing switch groups, effectively addressing the limitations of conventional designs.
Implementation Method 1
a switch converter including a first magnetic component (L)
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 switch group includes two switches coupled in series, and at least one capacitor is respectively coupled in parallel with a corresponding one of the switch groups; and a switch converter including a first magnetic component, where the switch converter is configured to share one of the switch groups, the first magnetic component is coupled to an intermediate node of the shared switch group, and the intermediate node is a common coupling point of two switches of the shared switch group.