Multi-Input DC Power Switching With Shared PFC and DC-DC Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dual-input switching power converters require two PFC converters and two DC-to-DC converters, leading to high circuit cost and complexity.
Innovation Solution
A multi-input power system with a switching switch, boost power factor correction circuit, DC-to-DC conversion circuit, determination circuit, and switch control circuit, allowing for the selection of a single input power source as the main power source and others as backup, using only one boost PFC and one DC-to-DC conversion circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two PFC converters and two DC-to-DC converters are used for dual-input power conversion, then the system can process multiple input power sources, but the circuit cost and device complexity increase significantly
Solution Approach 1:
The patent merges multiple converter functions into a single integrated converter that can handle multiple input power sources. Instead of using separate PFC converters and DC-to-DC converters for each input, the invention uses one converter with switchable input stages that can selectively connect to different power sources, thereby reducing component count while maintaining multi-input capability
Solution Approach 2:
The patent designs a universal converter structure that performs multiple functions: it can rectify and process different types of input power (AC, DC, battery), perform PFC, and regulate output voltage all within a single integrated circuit. This multi-functional design eliminates the need for dedicated converters for each input type, reducing overall system complexity
2Adaptability or versatility
If two PFC converters and two DC-to-DC converters are used for dual-input power conversion, then the system can process multiple input power sources, but the circuit cost increases
Solution Approach 1:
The patent combines multiple expensive converter components into a single integrated unit, reducing the total bill of materials. By sharing common components such as the DC-to-DC conversion stage, control circuitry, and magnetic elements across multiple input paths, the design significantly reduces manufacturing cost while maintaining the ability to accept multiple power sources
Solution Approach 2:
The universal converter design allows a single circuit to replace multiple specialized converters, reducing procurement and manufacturing costs. The switchable input architecture enables the same hardware to serve multiple functions depending on which power source is active, maximizing resource utilization and minimizing waste
3Reliability
If multiple independently operating converters are used, then each converter can be optimized for its specific function, but the overall system volume increases
Solution Approach 1:
The patent implements a nested converter architecture where the PFC stage is nested within the input section of the DC-to-DC converter, and the input switching network is nested within the overall converter structure. This hierarchical nesting allows multiple functional stages to share physical space and magnetic components, dramatically reducing the total volume required for the power supply system
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 solution simplifies the power supply structure, reduces component cost and volume, and achieves higher conversion efficiency by selecting the input power source with a higher voltage, thereby improving power supply quality.
Implementation Method 1
The at least two filter-rectification circuits respectively receive the at least two input power sources, and convert the at least two input power sources into at least two rectified voltages
Implementation Method 2
The boost power factor correction circuit receives the rectified voltage provided from the switching switch, and performs a power factor correction to the rectified voltage to provide a conversion voltage
Implementation Method 3
The DC-to-DC conversion circuit is connected to the boost power factor correction circuit and the DC-to-DC conversion circuit converts the conversion voltage into an output voltage
Data Source
AI summary
A multi-input power system receives at least two input power sources, and each input power source is an DC power source. The multi-input power system includes a switching switch, a DC-to-DC conversion circuit, a determination circuit, and a switch control circuit. The switching switch switches one of the at least two input power sources. The DC-to-DC conversion circuit receives the input power source, and converts the input power source into an output voltage. The determination circuit respectively receives at least two power information corresponding to the at least two input power sources, and determines at least two power supply status of the at least two input power sources to generate a determination signal. The switch control circuit receives the determination signal to generate a switch control signal to control the switching switch so as to switch one of the at least two input power sources.