Modular Converter Switch Topology for Phase Voltage Balancing
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Solution Overview
Problem
Power converter circuits experience oscillating currents due to unequal charging states of capacitors across phases, leading to voltage deviations and inefficiencies.
Innovation Solution
A modular switch configuration with series-connected controllable power semiconductor components and diodes, where the connecting point forms terminals, and a capacitor is connected in parallel, allowing for dynamic control of direct voltage and reducing current reversals, thus minimizing voltage deviations and oscillating currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional power converter circuits use series-connected controllable switches with parallel capacitors for each phase, then the converter can achieve voltage conversion functionality, but the capacitors of individual subsystems do not have the same charging state, leading to voltage deviations and oscillating currents between phases
Solution Approach 1:
The converter is divided into multiple independent modular switches, each with its own capacitor and switching devices. This segmentation allows each module to operate independently while contributing to the overall voltage conversion function, and enables localized control to maintain voltage balance across phases
Solution Approach 2:
The invention employs dynamic switching control where the switching states of individual modular switches are adjusted in real-time based on the charging states of their capacitors. This dynamic control ensures that voltage deviations between phases are compensated, preventing oscillating currents while maintaining the voltage conversion functionality
2Power
If multiple series-connected subsystems are used per phase to achieve voltage conversion, then the converter can handle higher voltages, but charge reversals occur during operation, resulting in oscillating currents between phases
Solution Approach 1:
The control system monitors the charging states of capacitors in each modular switch and adjusts the switching states accordingly. This feedback mechanism prevents charge reversals by ensuring that capacitors are switched only when in appropriate charging states, thereby eliminating the harmful oscillating currents between phases while maintaining high voltage handling capability
Solution Approach 2:
The invention prevents charge reversals by controlling the switching states to occur only under specific conditions that avoid reverse charging. By anticipating and preventing the harmful effect before it occurs, the system maintains stable operation without oscillating currents
Data Source
AI summary
Described is a modular switch for an electrical converter. The modular switch is provided with a first series circuit including a first controllable power semiconductor component and a first diode as well as with a second series circuit including a second diode and a second controllable power semiconductor. The connecting point between the first power semiconductor component and the first diode forms a first terminal and the connecting point between the second diode and the second power semiconductor component forms a second terminal of the modular switch. Also provided is a capacitor, wherein the first series circuit and the second series circuit and the capacitor are switched parallel to each other.