Double-Boost Quadratic DC/DC Converter for High Voltage Transformation
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Solution Overview
Problem
Existing Boost-type DC/DC converters face efficiency issues when achieving high transformation ratios, particularly when coupling batteries with supercapacitors, leading to voltage instability and accelerated battery aging due to the need for high voltage transformation, which reduces overall efficiency and increases size, weight, and cost.
Innovation Solution
A current-reversible double-boost quadratic DC/DC converter topology is introduced, featuring a specific branch configuration with induction coils, switches, and capacitors, allowing for higher transformation ratios while maintaining efficiency by controlling switches to optimize duty cycles and minimize switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a standard Boost converter is used to achieve high voltage transformation ratios, then the voltage transformation capability is improved, but the efficiency deteriorates
Solution Approach 1:
The patent divides the single high-ratio Boost converter into two cascaded Boost converters with intermediate voltage stages. The first Boost converter transforms input voltage to an intermediate voltage, and the second Boost converter transforms the intermediate voltage to the final high voltage. This segmentation allows each converter to operate at moderate transformation ratios, maintaining high efficiency while achieving the required overall voltage transformation.
2Power
If the duty cycle is increased to achieve higher transformation ratios, then the voltage transformation capability is improved, but the switching losses increase
Solution Approach 1:
By segmenting the transformation into two stages, each operating at moderate duty cycles (avoiding excessive duty cycles), the patent reduces switching losses in each stage compared to a single stage operating at very high duty cycle, while achieving the same overall transformation ratio.
3Device complexity
If a single Boost converter is used, then the device complexity is low, but the achievable transformation ratio is limited
Solution Approach 1:
The patent employs two Boost converters connected in cascade, where the output of the first serves as the input to the second. This segmentation enables achieving high transformation ratios that would be difficult or inefficient in a single converter, while keeping each individual converter section relatively simple and well-understood.
4Stability of the object's composition
If standard filtering elements are used with linear topology, then the voltage ripple is reduced, but the size and weight increase
Solution Approach 1:
By segmenting the conversion into two stages with an intermediate voltage, the patent reduces the stress on individual filtering elements. Each stage operates with more moderate current and voltage stresses, allowing for smaller inductors and capacitors compared to a single stage design, thereby reducing overall size and weight while maintaining voltage ripple performance.
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 topology achieves higher transformation ratios with identical efficiency compared to prior art, reducing size, weight, and cost by stabilizing voltage fluctuations and extending the charge range of supercapacitors, thereby improving the overall electrical conversion chain efficiency.
Implementation Method 1
a first induction coil (L1), a first switch (Q1), a second induction coil (L2)
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
The invention relates to a current-reversible double-boost quadratic DC/DC converter that can perform high turns ratios.