Pre-Switch presents step by step sequence to show AI optimised soft switching

Screen captures illustrate active learning, analysis and adjustments that initiate and maintain optimised system timing


re-Switch, a Silicon Valley start-up, has released a demonstration and full explanation of its CleanWave200 inverter reference. An animated

sequence of 20 1µs screen captures illustrates the Pre-Switch AI actively learning from initial start-up with unknown conditions, then subsequently optimizing and adjusting the timing necessary to ensure that a PWM input generates a current ramp to simulate the first part of a sine wave output.

Double pulse test data obtained from the 200kW inverter demonstrates that the Pre-Switch soft-switching platform – comprising the Pre- Drive3 controller board powered by the Pre-Flex FPGA, and RPG gate driver board – reduces total system switching losses by 90 per cent or more.

Upon commencement of the initial switching cycle (0), the Pre-Switch AI controller assesses multiple inputs to determine what mode the system is in, and then makes a safe but non-optimal estimate of the resonant period needed for soft switching. During the next switching cycle (1), all AI inputs and resulting outputs from switching cycle 0 are precisely re-measured and analysed. A second conservative resonant timing period, similar to switching cycle 0, is issued.

In follow on switching cycle (2), the AI algorithm is now quantitatively-confident and able to predict the optimized resonant timing to ensure full soft-switching - thus minimising losses in all aspects of the system. Then in

switching cycle 3, the AI compares system inputs and results from previous switching cycles and adjusts the resonant timing to fully optimise soft-switching with the increasing load current. These inputs and outputs are stored with the previous switching cycle inputs and resulting resonant timings to improve accuracy and system optimisation. In subsequent cycles, soft switching accuracy continues to be optimized, stored to and compared to desired results necessary to maintain accurate forced resonance soft switching. Changes in system temperature, input voltage, output load current, and device degradation are all accounted for and optimised within the Pre-Switch AI algorithm.

Switch actuator range delivers next generation switching


ollowing the successful launch of its compact Combi actuators range in 2019, ABB has further extended its portfolio with its new Standard and Professional versions, to offer the widest range on the market.

Based on its vision to offer next generation switching for increased comfort and versatility in both residential and commercial applications, ABB has enhanced its KNX Switch Actuator portfolio with updates to its Standard and Professional ranges.

34 May 2020

Oliver Iltisberger, managing director of ABB’s Smart Buildings business line says: “Our main priority is to ensure that our technology solutions are enablers for our customers. They need to be user friendly but, more importantly, as we continue with our Smart Cities’ Mission to Zero initiative, they also need to optimize energy usage. That’s why we’ve extended our range to offer three different options – from Combi for residential installations where space is at a premium, to our latest Standard and Professional versions – to offer the most comprehensive choice in the market.”

Components in Electronics

The new ABB i-bus KNX Standard Switch Actuator range offers the largest and most universally used selection of components to cover all standard switching requirements in today’s commercial projects. With a broad range of devices available with different outputs, from 2- to 12- fold, customers can now find a switch actuator that is a perfect fit for their application, delivering further savings on costs in the distribution board. These 12 devices are ideal for use in modern buildings and provide cost-effective and time-saving commissioning, with template pages and central functions for all outputs. Screw-head terminals make installation simple and no tools are required for DIN-rail assembly and disassembly. ABB i-bus KNX Professional Switch Actuators offer devices with high switching capacity and enhanced energy management functionality and are ideal for use in high-end applications. Suitable for large commercial projects, the series includes eight switch actuators, designed for reliable switching of high and capacitive loads of up to 20 A C-Load. Reinforcing ABB’s commitment to help customers optimise energy usage, the Professional range features four

Commenting Pre-Switch CEO, Bruce T. Renouard says, “Pre-Switch is enabling customers to build systems with switching frequencies 4X-5X faster than their hard- switched IGBT systems and 35X faster than their hard-switched SiC and GaN systems. The GIF demonstrates how our AI is working within the CleanWave200 to bi-directionally convert 800VDC to three- phase AC at power levels of up to 200kVA with a switching frequency of 100kHz at 99 percent efficiency levels.”

The Cleanwave200 evaluation system, reference design and design files can be ordered from Pre-Switch.

enhanced load and consumption control functions, for measurement, monitoring, metering and management. This provides total transparency over energy consumption and availability at the lowest level, so that flows can be controlled without any loss to availability, function or comfort. When Professional switch actuators are parameterised, users can program different settings or scenes to make sure that they are using energy in the most efficient way. For example, lights can be switched off when they’re not needed to cut down on unnecessary energy use and ultimately avoid higher tariffs. Alternatively, users can switch off certain loads while using battery-based power, to reduce obtaining energy from the grid.

“We are constantly looking for ways to help customers to increase comfort and versatility, without compromising the end-user experience. With these latest additions to our switch actuators range, we now offer the largest portfolio on the market, with a solution for every type of building. More importantly, we are giving customers the tools they need to ensure buildings only use energy when and where they need to,” adds Oliver Iltisberger.

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