Flying Capacitor Power Converter for Multi-Voltage Output Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power conversion devices require multiple output terminals with different output voltages to supply power to devices with varying voltage requirements, and existing solutions face challenges in efficiently converting high input voltages to lower output voltages without using transformers.
Innovation Solution
A power conversion device with a flying capacitor converter and an isolated DC/DC converter, utilizing capacitors to isolate primary and secondary circuits, allowing for voltage conversion without transformers, and controlling the voltage across a flying capacitor to manage input and output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power conversion device uses traditional transformer-based voltage conversion to supply multiple output voltages, then voltage conversion capability is improved, but device size and complexity increase
Solution Approach 1:
The patent extracts and eliminates the transformer component from the power conversion device. By using a flying capacitor-based voltage conversion circuit, the device achieves multiple output voltages without requiring a transformer, thereby reducing device size while maintaining voltage conversion capability
Solution Approach 2:
The patent replaces the electromagnetic transformation mechanism (transformer) with a capacitive voltage conversion mechanism. The flying capacitor circuit uses electrical field-based voltage multiplication and division to achieve the same function as the magnetic field-based transformer, resulting in a more compact design
2Adaptability or versatility
If a power conversion device includes multiple output terminals with different voltages, then adaptability to various devices is improved, but circuit complexity increases
Solution Approach 1:
The patent designs a universal power conversion circuit based on the flying capacitor that can generate multiple output voltages (first output voltage and second output voltage) from a single input voltage. This multi-functional circuit structure provides adaptability to various devices with different voltage requirements while maintaining a relatively simple and unified circuit architecture
Solution Approach 2:
The patent segments the voltage conversion function into distinct output paths. The flying capacitor circuit is configured to provide different voltage division ratios to different output terminals, allowing independent voltage selection for each output while using a common input stage, thereby managing complexity through functional segmentation
3Volume of stationary object
If a power conversion device converts high input voltage to lower output voltages without transformers, then device size is reduced, but control precision over output voltages becomes more difficult
Solution Approach 1:
The patent incorporates feedback control mechanisms in the power conversion device. The controller monitors the output voltages from the flying capacitor circuit and adjusts the switching signals to maintain precise voltage levels. This feedback system compensates for variations in input voltage and load conditions, ensuring accurate output voltage control without requiring transformers
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
Enables efficient conversion of power to different output voltages for high-voltage and low-voltage batteries in vehicles, reducing the size of the conversion device and maintaining control over output voltages without transformers.
Implementation Method 1
a flying capacitor electrically connecting a connection node between the first switching element and the second switching element to a connection node between the third switching element and the fourth switching element
Implementation Method 2
a reactor, a first output line electrically connecting one of the two first output terminals to one end of the switching circuit
Implementation Method 3
The second converter is an isolated DC/DC converter in which the primary-side circuit and the secondary-side circuit are electrically isolated from each other
Data Source
AI summary
A power conversion device includes two input terminals, a first converter, and two first output terminals configured to output power converted by the first converter. The first converter includes a switching circuit, a flying capacitor, and a reactor. The power conversion device includes a second converter configured to perform power conversion on a voltage across the flying capacitor as an input voltage, two second converter input terminals electrically connected to two ends of the flying capacitor, and two second output terminals configured to output power converted by the second converter. The second converter includes a primary-side circuit and a secondary-side circuit. The second converter is an isolated DC/DC converter in which the primary-side circuit and the secondary-side circuit are electrically isolated from each other.