DC Conversion Circuit with Buck-Boost and Resonant Stage
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Solution Overview
Problem
Conventional DC conversion circuits face challenges with electrolytic capacitors' short lifespan due to external factors, leading to reduced circuit life expectancy and increased output voltage ripple.
Innovation Solution
A DC conversion circuit incorporating a buck-boost converter and a resonant stage circuit with a filter element, utilizing a smaller inductance value inductor and smaller capacitance value capacitors to achieve faster response speed and reduced output voltage ripple, while employing a resonant stage to convert energy into negative voltage for improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrolytic capacitors with larger capacitance values are employed to reduce output voltage ripple, then the output voltage ripple is reduced, but the life expectancy of the DC conversion circuit is shortened
Solution Approach 1:
The patent divides the energy storage function into two separate components: a first capacitor (non-electrolytic) and a second capacitor (electrolytic). The first capacitor handles high-frequency ripple current, while the second capacitor handles low-frequency ripple current. This segmentation allows each capacitor to be optimized for its specific function, extending the overall circuit life while maintaining effective ripple suppression.
Solution Approach 2:
The patent applies partial action by having the first capacitor (with smaller capacitance value) handle only the high-frequency portion of the ripple current, while the second capacitor handles the remaining low-frequency portion. This distributed approach prevents any single capacitor from being overloaded, reducing stress and extending lifespan.
2Speed
If inductors with smaller inductance values are employed to achieve faster response speed, then the response speed of input current is improved, but the output voltage ripple becomes larger
Solution Approach 1:
The patent changes the parameters of the inductor by using a smaller inductance value to achieve faster response speed. To compensate for the increased voltage ripple that results from this parameter change, the patent introduces a dual-capacitor configuration where the first capacitor (non-electrolytic) and second capacitor (electrolytic) work together to suppress the ripple across different frequency ranges.
3Duration of action of stationary object
If non-electrolytic capacitors with smaller capacitance values are used to extend lifespan, then the life expectancy is improved, but the ability to suppress output voltage ripple is reduced
Solution Approach 1:
The patent segments the ripple suppression function across two capacitor types: the first capacitor (non-electrolytic, smaller capacitance) handles high-frequency ripple, while the second capacitor (electrolytic, larger capacitance) handles low-frequency ripple. This segmentation allows the non-electrolytic capacitor to maintain its lifespan advantage while the electrolytic capacitor provides the additional capacitance needed for comprehensive ripple suppression.
Solution Approach 2:
The patent creates a composite capacitor system by combining two different capacitor technologies (non-electrolytic and electrolytic) with complementary characteristics. The non-electrolytic capacitor provides long life and low ESR at high frequencies, while the electrolytic capacitor provides high capacitance for low-frequency ripple suppression. Together, they form a composite energy storage system that achieves both longevity and effective ripple suppression.
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 solution results in a DC conversion circuit with enhanced input response speed, reduced output voltage ripple, and extended lifespan by utilizing a buck-boost converter and resonant stage circuit with optimized inductor and capacitor values, and energy conversion techniques.
Implementation Method 1
the resonant stage circuit converts the second DC signal into energy for power charging, and outputs the energy to a load via its two output ends. Then, the resonant stage circuit converts the energy, which is used for power charging, to form a negative voltage by a resonance effect
Data Source
AI summary
A DC conversion circuit in the disclosure includes a buck-boost converter and a resonant stage circuit. The buck-boost converter has two input ends, a negative output end and a positive output end. The buck-boost converter receives a first DC signal via its two input ends, and outputs a second DC signal via its two output ends. The resonant stage circuit has two input ends and two output ends. The resonant stage circuit receives the second DC signal via its two input ends, converts the second DC signal into energy for power charging, and outputs the energy to a load via its two output ends. Then, the resonant stage circuit converts the energy, which is used for power charging, to form a negative voltage by a resonance effect, and outputs the energy to the load via its two output ends.