Dual-Path Resonant DC-DC Circuit for Wide Voltage Conversion
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Solution Overview
Problem
LLC resonant converters face limitations in adjusting the output voltage range and efficiency due to the constraints of transformer winding ratios and frequency adjustment, leading to increased power loss and size issues when stepping up or stepping down voltages.
Innovation Solution
The electronic circuitry employs a dual transmission mechanism using both magnetic and electric field coupling paths, selecting between transformer-based magnetic coupling for stepping down and capacitor-based electric field coupling for stepping up, allowing for flexible voltage adjustment with reduced losses by switching between these paths based on output voltage settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the number of windings of secondary winding is reduced to achieve high step-down ratio, then the converted voltage is sufficiently lower than input voltage, but power loss in secondary winding increases and transformer size increases
Solution Approach 1:
The patent applies dynamics by making the transformer winding configuration adjustable rather than fixed. The secondary winding can be dynamically reconfigured between series connection (for high voltage output) and parallel connection (for low voltage output), allowing the system to adapt to different output voltage requirements while optimizing efficiency for each mode.
Solution Approach 2:
The patent changes the electrical parameters of the transformer by altering the connection configuration of secondary windings. By switching between series and parallel connections, the effective number of turns and impedance are changed, enabling the system to achieve different voltage transformation ratios and impedance matching conditions without physical redesign.
2Shape
If the number of windings of secondary winding is increased to achieve high output voltage, then the converted voltage is as high as or about half as high as input voltage, but power loss in secondary winding increases and transformer size increases
Solution Approach 1:
The patent applies dynamics by making the transformer winding configuration adjustable rather than fixed. The secondary winding can be dynamically reconfigured between series connection (for high voltage output) and parallel connection (for low voltage output), allowing the system to adapt to different output voltage requirements while optimizing efficiency for each mode.
Solution Approach 2:
The patent changes the electrical parameters of the transformer by altering the connection configuration of secondary windings. By switching between series and parallel connections, the effective number of turns and impedance are changed, enabling the system to achieve different voltage transformation ratios and impedance matching conditions without physical redesign.
3Adaptability or versatility
If frequency adjustment is used to change output voltage ratio, then voltage ratio can be adjusted, but adjustment range is limited
Solution Approach 1:
The patent applies dynamics by making the transformer winding configuration adjustable rather than fixed. The secondary winding can be dynamically reconfigured between series connection (for high voltage output) and parallel connection (for low voltage output), allowing the system to adapt to different output voltage requirements while optimizing efficiency for each mode.
Solution Approach 2:
The patent changes the electrical parameters of the transformer by altering the connection configuration of secondary windings. By switching between series and parallel connections, the effective number of turns and impedance are changed, enabling the system to achieve different voltage transformation ratios and impedance matching conditions without physical redesign.
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 approach enables efficient DC-DC conversion with low power loss across a wide range of output voltages, optimizing transformer size and efficiency by dynamically selecting the transmission path based on voltage requirements.
Implementation Method 1
The LLC resonant converter is named for the fact that it utilizes the resonance between the leakage inductance of a transformer, a primary inductance (excitation inductance), and a capacitor.
Implementation Method 2
A sinusoidal voltage generated by the resonant circuit is converted by a transformer
Implementation Method 3
the converted voltage is rectified. Thus, a converted DC voltage is obtained.
Data Source
AI summary
Electronic circuitry includes a resonant circuit to receive a square-wave voltage based on a first DC voltage and generate a first voltage; a first transmission circuit to transmit the first voltage via a transformer including a primary inductor and a secondary inductor; a second transmission circuit to transmit the first voltage via a first capacitor and a second capacitor, the first capacitor being electrically connected to a first end of the primary inductor, the second capacitor being electrically connected to a second end of the primary inductor; a rectifier circuit to rectify the first voltage and generate a second DC voltage, the first voltage being transmitted by the first transmission circuit or the second transmission circuit; a first switch circuit configured to connect the first transmission circuit and the rectifier circuit; and a second switch circuit to connect the second transmission circuit and the rectifier circuit.