Sector News

Super-junction MOSFETs minimise power dissipation

Tue, Jan 22, 2019

Leveraging ST Microelectronics’ carrier-lifetime control technology, the MDmesh DM6 MOSFETs are 600V devices that contain a fast recovery body diode to bring the performance advantages of ST’s super-junction technology to full and half-bridge topologies, zero voltage switching (ZVS) phase shift converters and any topologies that require a diode able to handle dynamic dV/dt.

The MDmesh DM6 MOSFETs have reduced reverse-recovery time (trr) to minimise power dissipation in the diode when turning off after freewheeling. Recovery softness is optimised to enhance reliability, adds ST. In addition, very low gate charge (Qg) and on-resistance (RDSON), and a capacitance profile tailored for light loads, allow higher operating frequencies and greater efficiency, with simplified thermal management and reduced EMI. These characteristics make the MDmesh DM6 devices suitable for equipment such as charging stations for electric vehicles, telecom or data centre power converters, and solar inverters, where they are claimed to enable superior energy ratings with more robust performance and increased power density.

The MOSFETs are part of the STPower portfolio. There are 23 part numbers covering current ratings from 15 to 72A, with gate charge (Qg) ranging from 20nC to 117nC and RDSON from 0.240 down to 0.036 Ohm respectively.

Package options include the new low-inductance leadless TO-LL, PowerFLAT 8×8 HV, D2PAK, TO-220, and TO-247 with short leads, long leads, or Kelvin pin for applications requiring precision current sensing.

The MDmesh DM6 family is in production now. Please contact your local ST office for pricing and sample requests.

http://www.st.com

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Renesas uses AI for motor-driven home appliance maintenance

Tue, Jan 22, 2019

Renesas Electronics introduces its Failure Detection e-AI Solution for motor-equipped home appliances, featuring the Renesas RX66T 32-bit microcontroller. It simplifies home appliance maintenance and makes it easy to add abnormality-detection AI to the microcontroller for failure detection and predictive maintenance.

Embedded AI (e-AI) enables failure detection of home appliances, such as refrigerators, air conditioners, and washing machines, due to motor abnormality. Property data showing the motor’s current or rotation rate status can be used directly for abnormality detection, making it possible to implement both motor control and e-AI–based abnormality detection with a single microcontroller, says Renesas. Using the RX66T eliminates the need for additional sensors, and reduces the bill of materials cost.

When a home appliance malfunctions, the motor operation typically appears abnormal when running and being monitored for fault detection in real-time. Implementing e-AI-based motor control-based detection means that failure detection results can be applied not only to trigger alarms when a fault occurs, but also for preventive maintenance. e-AI can estimate when repairs and maintenance should be performed, and it can identify the fault locations to boost maintenance efficiency and improve product safety by adding functionality that predicts faults before they occur.

The Renesas Failure Detection e-AI Solution for motor-equipped home appliances can control up to four motors by virtue of using the RX66T. Today’s washing machines typically incorporate three motors, one to rotate the washing tub, one to drive the water circulation pump, and one to drive the drying fan. The Renesas Failure Detection e-AI Solution can be used to control these three motors with a single RX66T chip while at the same time monitoring all three motors for faults.

The e-AI solution uses the Renesas Motor Control Evaluation System and an RX66T CPU card. This hardware is combined with a set of sample program files that run on the RX66T as well as a GUI tool that enables collecting and analysing property data indicating motor states. To detect faults, it is necessary to learn the characteristics of the normal state. System engineers can use the GUI tool to begin developing AI learning and optimised fault detection functionality. Once the AI models are developed, the e-AI Translator, e-AI Checker, and e-AI Importer which make up the e-AI solution, can be used to import the learned AI models into the RX66T.

http://www.renesas.com

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Zero-drift op amp provides EMI filtering

Wed, Jan 16, 2019

Meeting the needs of precision measurement in industrial control and factory automation, the MCP6V51 zero-drift operational amplifier (op amp) provides precision measurement and minimises the influence of high-frequency interference, claims Microchip. The MCP6V51 offers a wide operating range and on-chip EMI filters.

The so-called smart factory has led to an increase in the number of sensors that need to be monitored and the MCP6V51 amplifier is designed to provide accurate, stable data from a variety of sensors. Its self-correcting zero-drift architecture enables high DC precision, claims Microchip, providing a maximum offset of ±15 microV and only ±36 nanoV per degree C of maximum offset drift. The MCP6V51 supports a wide operating voltage range – from 4.5 to 45V, suitable for factory automation, process control and building automation applications.

The increasing numbers of wireless sensors and wireless capabilities raises high frequency interference within sensitive analogue measurement as a critical consideration. The additional on-chip EMI filtering within the MCP6V51 provides protection from these unwanted and unpredictable interference sources. This allows designers to provide improved performance while more easily managing an increasingly difficult environment.

Programmable logic controllers and distributed control systems used within industrial automation run on a variety of voltage rails, such as 12, 24 or 36V. The support for a wide range of supply voltages includes overhead to account for supply transients by supporting an operating range up to 45V.

An evaluation board is also available. The eight-pin SOIC/MSOP/TSSOP/DIP evaluation board (Part # SOIC8EV) is a blank PCB that allows each device pin to be connected to a pull-up resistor, a pull-down resistor, an in-line resistor, and a loading capacitor. The PCB pads allow through-hole or surface-mount connectors to be installed to ease connection to the board. Additional passive component footprints are on the board, to allow simple circuits to be implemented.

The MCP6V51 is available today for sampling and volume production in both eight-lead MSOPs and five-lead SOT-23 packages.

http://www.microchip.com

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LoRaWAN products connect and monitor remote areas

Wed, Jan 16, 2019

LoRaWAN wireless products from Advantech B+B SmartWorx help users control and manage applications in remote areas. They use LoRa wireless sensing technology in these areas to monitor conditions, for example flood monitoring, and operate in harsh environments including extreme temperatures and high humidity.

Advantech uses LoRa wireless sensing technology to overcome the obstacle of distance, exploiting LoRa’s benefits such as operation over long distances – from five to 15km (three to nine miles). A single basestation can provide deep penetration in dense urban and indoor regions and can connect rural areas up to 48km (30 miles) away. The protocol is designed specifically for low power consumption battery lifetime is extended over years of operation while providing high capacity capable of supporting millions of messages per basestation, making the technology suitable for public network operators serving many customers, says Advantech.

LoRa networks reduce system costs by lowering infrastructure investment, operating expenses and end-node sensor cost, while offering high security with embedded end-to-end AES128 encryption, explains Advantech.

Advantech offers the WISE-6610 LoRa Gateway (LoRaWAN Private) which supports 868/915Mhz. It meets Cat. 4 LTE and has a nine to 36V DC power input. The battery powered Wzzard LRPv2 is based on Modbus RS485, 4AI/2DI/1DO and has a wide operating temperature range of -40 to +75 degrees C. It is protected to IP66.

Advantech specialises in intelligent IoT systems and embedded platforms. Its hardware and software can be used for IoT, big data, and artificial intelligence. Advantech’s Edge Intelligence WISE-PaaS core assists business partners and clients in connecting their industrial chains. Advantech is also working with business partners to co-create business ecosystems that accelerate the goal of realising industrial intelligence.

This news story is brought to you by softei.com, the specialist site dedicated to delivering information about what’s new in the electronics industry, with daily news updates, new products and industry news.

http://www.advantech.com

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