DC Conversion Circuit Resonant Stage Ripple Suppression
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Solution Overview
Problem
Conventional DC conversion circuits using electrolytic capacitors for energy storage have a shorter lifespan due to sensitivity to external factors and temperature, leading to reduced circuit life expectancy and increased output voltage ripple.
Innovation Solution
A DC conversion circuit comprising a buck-boost converter, a resonant stage circuit, and an output stage circuit that employs a combination of inductors and capacitors to achieve faster response speed and reduced output current ripple, utilizing a resonance effect to convert energy and suppress ripples, while avoiding the use of electrolytic capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an electrolytic capacitor is used to achieve faster response speed and smaller output current ripple, then the response speed and ripple performance are improved, but the life expectancy of the circuit is shortened
Solution Approach 1:
The patent extracts the problematic electrolytic capacitor from the circuit and replaces it with a resonant stage circuit comprising capacitors and inductors. This removal eliminates the lifespan limitation while preserving the energy storage function through alternative components that do not suffer from electrolytic degradation.
Solution Approach 2:
The resonant stage circuit acts as an intermediary between the buck-boost converter and the output stage. It introduces resonant oscillation to transfer energy efficiently, achieving both fast response and low ripple without relying on electrolytic capacitors. The resonant circuit mediates the energy transfer process through electromagnetic oscillation.
2Speed
If an inductor with smaller inductance value is used, then the response speed is improved, but the output voltage ripple increases
Solution Approach 1:
The patent applies resonant vibration principles to the electrical circuit. The resonant stage circuit generates controlled electromagnetic oscillations at a specific frequency, allowing energy to be transferred efficiently while the oscillatory nature of the resonance naturally filters out voltage ripples. This vibrational approach enables fast response without the harmful ripple effects.
Solution Approach 2:
The patent changes the operating parameters of the circuit by introducing resonant frequency operation. By tuning the resonant stage circuit to operate at its natural resonant frequency, the system achieves optimal energy transfer with minimal losses and minimal voltage ripple, thereby decoupling the trade-off between response speed and ripple magnitude.
3Object-generated harmful factors
If an inductor with larger inductance value is used, then the output voltage ripple is reduced, but the response speed becomes slower
Solution Approach 1:
The resonant stage circuit introduces controlled electromagnetic oscillations that enable rapid energy transfer regardless of the inductor size in the buck-boost converter. The resonant vibration allows the system to overcome the inertia effect of larger inductors, achieving fast response while the resonant filtering action simultaneously reduces output voltage ripple.
Solution Approach 2:
The patent employs periodic resonant oscillation in the resonant stage circuit. This periodic energy transfer mechanism allows the system to charge and discharge energy in controlled cycles, achieving both fast overall response and smooth output with reduced ripple. The periodic nature of resonance enables efficient energy transfer without the limitations of static inductor values.
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 circuit achieves a faster input response, smaller output current ripple, and a longer lifespan by using a resonant stage and output stage circuit to filter and store energy effectively, overcoming the limitations of electrolytic capacitors.
Implementation Method 1
converting the second DC signal to energy, and outputting the energy via its two output ends, and further used for converting the energy to a negative voltage through a resonance effect and outputting the energy via its two output ends
Data Source
AI summary
A direct current (DC) conversion circuit suitable for driving a load comprises a buck-boost converter, a resonant stage circuit and an output stage circuit. The buck-boost converter has two input ends receiving a first DC signal, and two output ends outputting a second DC signal. The resonant stage circuit has two input ends receiving the second DC signal. The resonant stage circuit converts the second DC signal to energy and further converts the energy to a negative voltage by a resonance effect. The resonant stage circuit has two input ends outputting the energy. The output stage circuit has two input ends receiving the energy to store the energy, and two output ends outputting energy to the load.