Solid Electrolyte DC-DC Converter With Adaptive Frequency Modes
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Solution Overview
Problem
Current DC-DC converters face inefficiencies due to limitations in switching frequency and mode operation, particularly with solid electrolyte capacitors, which lose efficiency at high frequencies and have limited energy density.
Innovation Solution
A DC-DC converter design that utilizes solid electrolyte capacitors, switching between ionic and electrostatic operating modes based on switching frequency, with a control circuit adjusting the frequency to match output power demands, optimizing energy density and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the switching frequency is increased to improve power conversion speed, then the power conversion efficiency deteriorates due to losses in solid electrolyte capacitors
Solution Approach 1:
The patent applies dynamics by making the switching frequency adjustable rather than fixed. The control circuit dynamically adapts the switching frequency based on load conditions, allowing the system to optimize between speed and efficiency requirements in real-time operation
Solution Approach 2:
The patent changes the operating parameters of the solid electrolyte capacitor by switching between two distinct frequency ranges. At low frequencies (below cutoff), the capacitor operates in ionic mode with high efficiency. At high frequencies (above cutoff), it operates in electrostatic mode, accepting some efficiency loss for faster response. This parameter change resolves the contradiction between speed and efficiency
2Loss of energy
If the switching frequency is decreased to improve efficiency in ionic mode, then the power conversion capability deteriorates at high power demands
Solution Approach 1:
The system dynamically adjusts switching frequency based on power demand levels. Under light load conditions, it operates at low frequency in ionic mode for maximum efficiency. Under heavy load conditions requiring high power conversion capability, it switches to high frequency electrostatic mode, ensuring adequate power handling capacity
Solution Approach 2:
The patent utilizes periodic switching between two operating modes (ionic and electrostatic) depending on power demand. This periodic adaptation allows the system to cycle between efficiency-optimized and power-optimized states, resolving the contradiction between efficiency and power capability across varying operating conditions
3Device complexity
If a fixed switching frequency is used to simplify control, then the adaptability to varying load conditions deteriorates
Solution Approach 1:
The control circuit is designed to be dynamically adaptive, automatically adjusting the switching frequency based on detected load conditions. This dynamic behavior provides high adaptability to varying power demands while maintaining relatively simple control logic through frequency-based mode selection
Solution Approach 2:
The system incorporates feedback mechanisms that monitor load conditions and use this information to adjust the switching frequency appropriately. This feedback loop enables the converter to adapt to varying power demands automatically, resolving the contradiction between simple control and high adaptability
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 converter achieves improved energy density and efficiency by dynamically switching between ionic and electrostatic modes, enhancing power conversion performance across varying load conditions.
Implementation Method 1
solid electrolyte capacitor exhibiting ionic-type operation below a cutoff frequency and electrostatic-type operation for higher frequencies
Implementation Method 2
electrostatic-type operation for higher frequencies
Data Source
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AI summary
This description relates to a DC-DC converter (100) comprising a first node (N1) and a second node (N2) intended to receive a DC voltage to be converted; a third node (N3) intended to provide a DC voltage referenced to the second node; at least one first solid electrolyte capacitor (C1); at least one first switching cell (420) consisting of four switches (421, 422, 431, 432) coupling respectively a first electrode of the capacitor to the first node and the third node and a second electrode of the capacitor to the second node and the third node; the switching frequency of the switches being adapted to the power required at the output and to select an operating mode of the first capacitor from an electrostatic operating mode and an ionic operating mode.