Bidirectional DC-DC Converter Topology for High Gain and Low Ripple
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Solution Overview
Problem
Existing DC-DC converters struggle with achieving high voltage gain and efficient bidirectional energy flow in applications like electric vehicles and photovoltaic systems, often requiring complex circuits and high ripple currents, which are inefficient and costly.
Innovation Solution
A bidirectional DC-DC converter with a simplified circuit configuration using only five active switches and two inductors, capable of achieving voltage gain ratios greater than 5.8 in boost mode and step-down ratios less than 1/5.8 in buck mode, with reduced passive elements and shared ground for input and output terminals, minimizing current ripple and increasing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional DC-DC converters are used to achieve high voltage gain, then voltage conversion ratio is improved, but circuit complexity increases
Solution Approach 1:
The patent combines multiple functions into a single circuit topology that achieves high voltage gain bidirectional conversion. The converter integrates boost and buck operations in one unified structure with only five switches and two inductors, eliminating the need for separate circuits for each function while maintaining high voltage conversion ratios greater than 5.8:1
Solution Approach 2:
The converter circuit is designed to perform multiple functions: it can operate in boost mode for high voltage gain (greater than 5.8:1), in buck mode for high voltage reduction (less than 1/5.8:1), and supports bidirectional energy flow. This multi-functional capability replaces what would traditionally require multiple separate circuits, reducing overall system complexity
2Adaptability or versatility
If conventional DC-DC converters are used for bidirectional energy flow, then energy transfer capability is improved, but component count increases
Solution Approach 1:
The patent merges bidirectional energy flow capability into a single converter topology with minimal components. The same five switches and two inductors enable energy to flow in both directions (boost and buck modes) without requiring separate circuits, reducing the total component count while maintaining full bidirectional functionality
Solution Approach 2:
The converter uses a universal circuit structure that handles both energy flow directions efficiently. The circuit can operate as a high-gain boost converter or a high-reduction buck converter using the same components, eliminating the need for duplicate components for each direction and achieving versatile bidirectional operation with minimal parts
3Power
If conventional DC-DC converters are used to achieve high voltage gain, then voltage conversion ratio is improved, but current ripple increases
Solution Approach 1:
The patent segments the current path through the use of two separate inductors (L1 and L2) that work in conjunction with five switches. This segmentation allows the converter to achieve high voltage gain while distributing and filtering current ripple more effectively, resulting in lower overall current ripple compared to conventional single-inductor designs with the same voltage gain
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 proposed converter achieves high voltage gain and efficient bidirectional energy transfer with reduced component count and lower ripple currents, enhancing power transfer efficiency and system reliability in electric vehicles and photovoltaic systems.
Implementation Method 1
A bidirectional DC-DC converter with a simplified circuit configuration using only five active switches and two inductors, capable of achieving voltage gain ratios greater than 5.8 in boost mode and step-down ratios less than 1/5.8 in buck mode
Data Source
AI summary
A bi-directional DC voltage converter includes a controller, controlled switches, inductors, and capacitors to accomplish DC voltage conversion with minimal input current ripple and high efficiency. The controller is operable in a boost mode in which the switches are independently controlled to convert low-voltage DC power to high-voltage DC power. The controller is operable in a buck mode in which the switches are independently controlled to convert high-voltage DC power to low-voltage DC power.