Power

Rugged SiC power devices available at 1,700V

28th July 2021
Alex Lynn

Today’s energy-efficient electric charging systems powering commercial vehicle propulsion, as well as auxiliary power systems, solar inverters, solid-state transformers and other transportation and industrial applications all rely on high-voltage switching power devices. To meet these requirements, Microchip Technology has announced the expansion of its SiC power portfolio with a family of high-efficiency, high-reliability 1,700V silicon carbide MOSFET die, discrete and power modules.

Microchip’s 1,700V silicon carbide technology is an alternative to silicon IGBTs. The earlier technology required designers to compromise performance and use complicated topologies due to restrictions on switching frequency by lossy silicon IGBTs. In addition, the size and weight of power electronic systems are bloated by transformers, which can only be reduced in size by increasing switching frequency.

The new silicon carbide product family allows engineers to move beyond IGBTs, instead using two-level topologies with reduced part count, greater efficiency and simpler control schemes. Without switching limitations, power conversion units can be significantly reduced in size and weight, freeing up space for more charging stations, additional room for paying passengers and cargo, or extending the range and operating time of heavy vehicles, electric buses and other battery-powered commercial vehicles – all at reduced overall system cost.

“System developers in the transportation segment are continuously asked to fit more people and goods into vehicles that cannot be made larger,” said Leon Gross, Vice President of Microchip’s discrete product business unit. “One of the best ways to help achieve this is through the enormous reductions in size, and weight of power conversion equipment that utilises high-voltage silicon carbide power devices. These same advantages for transportation bring similar benefits to many other industry applications.”

Features include gate oxide stability where Microchip observed no shift in threshold voltage even after an extended 100,000 pulses in repetitive unclamped inductive switching (R-UIS) tests. R-UIS tests also showed excellent avalanche ruggedness and parametric stability and with gate oxide stability, demonstrated reliable operation over the life of the system.

The degradation-free body diode can eliminate the need to use an external diode with the silicon carbide MOSFET. A short-circuit withstand capability comparable to IGBTs survives harmful electrical transients. A flatter RDS(on) curve over junction temperature from zero to 175oC enables the power system to operate at greater stability than other silicon carbide MOSFETs that exhibit more sensitivity to temperature.

Microchip streamlines the adoption of its technology with a family of AgileSwitch digital programmable gate drivers and wide range of discrete and power module packaging, available in standard and customisable formats. These gate drivers help speed silicon carbide development from benchtop to production.

Other Microchip silicon carbide products include families of MOSFETs and Schottky Barrier diodes at 700 and 1,200V, available in bare die and a variety of discrete and power module packages.

Microchip unifies in-house silicon carbide die production with low-inductance power packaging and digital programmable gate drivers to enable designers to make the most efficient, compact, and reliable end products.

The company’s total system solutions also include a portfolio of microcontrollers (MCUs), analogue and peripherals, and communication, wireless and security technology.

Development tools

Silicon carbide SPICE simulation models compatible with Microchip’s MPLAB Mindi analogue simulator provide system developers with resources to simulate switching characteristics before committing to hardware design. The Intelligent Configuration Tool (ICT) enables designers to model efficient silicon carbide gate driver settings for Microchip’s AgileSwitch family of digital programmable gate drivers.

Availability

Microchip’s 1,700V silicon carbide MOSFET die, discrete and power modules are available now for order in a variety of package options.

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