Series Switch Assembly Driver Supply Using Capacitor Bridges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In series-connected semiconductor switch circuits, the energy supply to drivers from capacitors is challenging due to voltage fluctuations and potential differences between switches, leading to inefficiencies in energy distribution.
Innovation Solution
A circuit arrangement with series-connected switch assemblies and switch-mode power supply units, where each pair of semiconductor switches is supplied by a dedicated power unit, using capacitor bridges to minimize potential differences and stabilize energy distribution across the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single capacitor circuit supplies energy to all drivers in the series circuit, then the energy supply structure is simple, but voltage fluctuations and potential differences cause unstable energy distribution
Solution Approach 1:
The patent divides the single capacitor circuit into multiple separate capacitors, with each capacitor dedicated to supplying energy to a specific driver in the series circuit. This segmentation isolates the energy supply paths, preventing voltage fluctuations and potential differences from affecting the entire system, thereby stabilizing energy distribution while maintaining reasonable structural complexity.
2Reliability
If multiple capacitors connected in series supply energy to drivers, then energy distribution stability improves, but voltage sharing fluctuations between capacitors worsen
Solution Approach 1:
Instead of connecting multiple capacitors in series, the patent segments them into independent parallel branches, each supplying a specific driver. This eliminates the voltage sharing fluctuations inherent in series connections, as each capacitor operates independently with its own voltage level, ensuring stable energy distribution without composition instability.
Solution Approach 2:
The patent connects corresponding capacitors from different branches through equipotential connections, ensuring that capacitors supplying drivers at the same electrical potential are also at the same potential. This prevents potential differences from causing current leakage or instability, maintaining both energy distribution stability and voltage composition stability.
3Power
If drivers are supplied from high voltage capacitor circuit, then the voltage level is sufficient, but the potential difference causes energy coupling difficulties
Solution Approach 1:
The patent segments the high voltage capacitor circuit into multiple lower voltage capacitors, each dedicated to a specific driver. This reduces the potential difference between the capacitor and driver, simplifying the energy coupling structure while maintaining sufficient voltage levels for proper driver operation through the series configuration.
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 configuration ensures stable and efficient energy supply to semiconductor switch drivers, reducing voltage fluctuations and potential differences, thereby enhancing the reliability and efficiency of the power convertor module.
Implementation Method 1
two capacitor bridges each having at least one capacitor
Implementation Method 2
Each switch-mode power supply unit is assigned to a switch pair of semiconductor switches and supplies the drivers of both semiconductor switches of the switch pair with energy
Data Source
AI summary
A circuit arrangement includes two switching group series circuits of switch assemblies, switch-mode power supply units, and two capacitor bridges connecting the switching group series circuits. Each switch assembly has a parallel circuit of a semiconductor switch and a freewheeling diode as well as a driver for actuating the semiconductor switch. Each switch-mode power supply unit is associated with a switch pair of semiconductor switches and supplies the drivers of both semiconductor switches of the switch pair with energy. Each switch pair is formed by a semiconductor switch of a first switching group series circuit and a semiconductor switch of a second switching group series circuit. A power convertor module having the circuit arrangement is also provided.