Method for Controlling and Switching Arrangement for a Multiphase Two-Level Inverter and Multiphase Two-Level Inverter

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This invention relates to a method and circuit arrangement for controlling a multi-phase two-level inverter (such as those used to convert DC to AC power in applications like motor drives or PV inverters). The core innovation is to use a single inductor for all phases in the auxiliary snubber (relief) circuit, rather than requiring one inductor per phase. This is achieved through controlled activation of relief switches for each phase, carefully timing their operations to prevent conflicts or short-circuits, thus significantly reducing switching losses and the number of passive components required in the inverter design.

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• Electric vehicle drive inverters for powering multi-phase motors
• Industrial motor control systems with multi-phase inverters
• Renewable energy systems such as photovoltaic (PV) inverters for converting solar panel DC power into multi-phase AC
• Uninterruptible power supplies (UPS) and grid-tied AC systems requiring efficient power conversion
• Railway traction converters and any high-power, multi-phase DC-AC conversion applications

BenefitsContent extracted from patent full text and abstract with AI.

• Reduces size and weight of the inverter by minimizing the number of inductors needed (one for all phases instead of one per phase)
• Lowers cost by reducing passive component count and simplifying the auxiliary circuit design
• Improves switching efficiency, thereby reducing energy losses and heat generation
• Facilitates high-frequency operation and potential for more compact, lighter equipment (e.g., in electric vehicles)
• Enables safer, more reliable inverter operation through collision-avoidance in relief switch actuation
• Supports bidirectional power flow, useful for regenerative braking and certain smart grid scenarios

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The invention describes a method for actuating a multi-phase two-point inverter. The multi-phase two-point inverter has a switching assembly (2) with a relief network (7) with one bidirectional relief switch (Bp) per phase (P = 1, 2, 3) and an inductor (L) for the at least two phases (P), which inductor is connected via the respective bidirectional relief switch (Bp) to at least two output terminals (Ap) for the respective phase (P). The relief switches (Bp) are activated to reduce switching losses during the switching of respective power switches (Spv, V = +, -), wherein it is prevented that the relief switches (Bp) of different phases (P) are activated simultaneously, while the output terminals (Ap) of the respective phases (P) are on a different potential of the input DC voltage (UZK). The invention further describes a multi-phase two-point inverter and a switching arrangement (2) herefor.