Bi-directional DC Converter Single Magnetic Element Topology
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Solution Overview
Problem
Conventional DC-to-DC converters are complex and inefficient, requiring multiple switches, inductors, and capacitors, and have intricate control circuits, which complicates their operation in both charging and discharging modes.
Innovation Solution
A bi-directional DC converter design utilizing a single magnetic element and detection circuitry to switch between charging and discharging modes based on input power availability, operating in synchronous buck mode when power is present and synchronous boost mode when it is not, with a simplified control structure and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional DC-to-DC converter design is used with multiple switches, inductors, and capacitors, then the converter can achieve bidirectional power conversion, but the device complexity and control circuit intricacy increase significantly
Solution Approach 1:
The single magnetic element is designed to perform multiple functions: it serves as an inductor during buck conversion (charging mode) and as an inductor during boost conversion (discharging mode). This universal component replaces what would traditionally require separate inductors for each conversion mode, thereby reducing component count while maintaining bidirectional power conversion capability
Solution Approach 2:
The patent merges the charging path and discharging path into a single integrated circuit topology with shared components. The single magnetic element, along with shared switches and diodes, creates a unified structure that eliminates the need for separate converter circuits for charging and discharging, thus simplifying the overall device complexity
2Adaptability or versatility
If multiple magnetic elements are used in conventional DC converters, then power conversion in both charging and discharging modes is enabled, but the quantity of components and device complexity increase
Solution Approach 1:
The single magnetic element is engineered to fulfill the role of multiple inductors by operating in different modes. During charging, it functions as the charging inductor; during discharging, it functions as the discharging inductor. This multi-functionality eliminates the need for separate magnetic elements for each mode, reducing the quantity from two or more to one
3Reliability
If conventional DC converter control circuits are used, then regulation of output voltage is achieved, but the control circuitry becomes intricate and difficult to operate
Solution Approach 1:
The control circuit dynamically switches between buck mode and boost mode based on the operational state (charging or discharging). The single magnetic element and associated switches are controlled to transition smoothly between conversion modes, maintaining voltage regulation while simplifying the control logic compared to managing multiple independent converter circuits
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 design enhances efficiency and simplifies the control circuitry while maintaining high performance in both charging and discharging operations, reducing the number of components and improving overall system efficiency.
Implementation Method 1
transferring power through the single magnetic element in both the first operation mode and the second operation mode
Data Source
AI summary
Disclosed herein are bi-directional DC converter circuits and control methods. In one embodiment, a method of controlling a bi-directional DC converter, can include: (i) detecting whether there is an input power supply at an input port, where the bi-directional DC converter comprises a single magnetic element; (ii) operating the bi-directional DC converter in a first operation mode to charge a battery when the input power supply is detected at the input port; (iii) operating the bi-directional DC converter in a second operation mode to transfer power from the battery to an output port for a load when the input power supply is not detected at the input port; and (iv) transferring power through the single magnetic element in both the first operation mode and the second operation mode.