Flipped conversion circuit and photovoltaic power generation system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-voltage direct current (HVDC) systems, uninterruptible power supply (UPS) systems, and photovoltaic power generation systems face inefficiencies due to excessive semiconductor devices in direct current combiner boxes, leading to increased manufacturing costs and reduced conversion efficiency.
Innovation Solution
A flipped conversion circuit with a half-bridge switch unit, resonant unit, series diode unit, energy storage switch unit, and controller is introduced, reducing the number of semiconductor devices and optimizing switch operations for zero-voltage turn-on conditions, thereby reducing costs and losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional DC-DC circuit and RSCC circuit topology is used, then voltage conversion and current reduction are achieved, but the quantity of semiconductor devices is excessive, increasing manufacturing costs and losses
Solution Approach 1:
The patent merges the DC-DC conversion function and the voltage flipping function into a single integrated flipped conversion circuit. The half-bridge switch unit performs both voltage doubling and polarity inversion in one circuit topology, eliminating the need for separate DC-DC converter and RSCC circuit, thereby significantly reducing the quantity of semiconductor devices while maintaining the same energy conversion and current reduction capabilities
Solution Approach 2:
The half-bridge switch unit in the flipped conversion circuit is designed to perform multiple functions simultaneously: it achieves voltage conversion, voltage doubling, and polarity inversion through a single circuit configuration. This multi-functional design reduces the overall device complexity and semiconductor device count compared to using separate specialized circuits for each function
2Ease of manufacture
If excessive semiconductor devices are used in the direct current combiner box, then voltage conversion capability is maintained, but manufacturing costs increase
Solution Approach 1:
The patent combines multiple circuit functions into a single flipped conversion circuit with fewer semiconductor devices. By integrating the DC-DC conversion and voltage flipping operations into one circuit topology, the manufacturing cost is reduced due to fewer components, simpler assembly, and lower material requirements, while still achieving the necessary voltage conversion capability
3Productivity
If conventional DC-DC and RSCC circuits are used, then current reduction is achieved, but conversion efficiency decreases due to high semiconductor losses
Solution Approach 1:
The patent integrates the DC-DC conversion and voltage flipping functions into a single flipped conversion circuit, reducing the total number of semiconductor devices and their associated losses. The unified circuit topology minimizes energy dissipation through fewer switching operations and reduced parasitic elements, thereby improving overall conversion efficiency while achieving the required current reduction
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 significantly reduces semiconductor device count, lowers costs, and enhances conversion efficiency by enabling zero-voltage turn-on conditions for switch devices, resulting in improved power supply performance.
Implementation Method 1
a resonant unit, a series diode unit, an energy storage switch unit... The resonant unit includes a first capacitor and a first inductor
Implementation Method 2
The resonant unit includes a first capacitor and a first inductor, where a first end of the first inductor is connected to the half-bridge switch unit
Implementation Method 3
The resonant unit includes a first capacitor and a first inductor, where a second end of the first capacitor is connected to the series diode unit
Data Source
AI summary
Examples of a flipped conversion circuit and a photovoltaic power generation system are described. In one example, a flipped conversion circuit includes a plurality of connection ends, a half-bridge switch unit, an output capacitor unit, a resonant unit, a series diode unit, an energy storage switch unit, an input unit, an output unit, and a controller. The energy storage switch unit includes at least one switch device and a first diode, and the at least one switch device is connected to the first diode in series. The controller is configured to convert, by controlling the switch device in the half-bridge switch unit and the switch device in the energy storage switch unit to be turned on or turned off, a first voltage that is input by the input unit into a second voltage, so that the output unit outputs the second voltage.