Power modules for cooling in aerospace Power
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ISSOID, provider of high temperature semiconductors and power modules, is adding to its growing platform of 3-Phase Silicon Carbide (SiC) MOSFET Intelligent Power Module (IPM) products by introducing new liquid-cooled modules for E-mobility tailored for lower switching losses or for higher power. The company is also introducing a module based on a lightweight AlSiC flat baseplate that meets the demand for natural convection or forced cooling in aerospace and in dedicated industrial applications. These products integrate a 3-Phase SiC MOSFET module with a powerful gate driver. These new IPMs leverage a technology platform that can be rapidly adapted to new voltage, power and cooling requirements. They greatly accelerate the design of SiC-based power converters enabling high efficiency and high power density. The embedded gate driver solves
multiple challenges related to fast-switching SiC transistors: negative drive and Active Miller Clamping (AMC) prevent parasitic turn-on; Desaturation detection and Soft-Shut-Down (SSD) react rapidly but safely to short-circuit events; Undervoltage Lockout (UVLO) functions on gate driver and DC bus voltages monitor the proper operation of the system. Two new liquid-cooled power modules based on a pin fin baseplate are rated for 1200V blocking voltages and for 340A to 550A Maximum Continuous Currents. The On Resistance ranges from 2.53mOhms to 4.19mOhms depending on current rating. The total switching energies are as low as 7.48mJ (Eon) and 7.39mJ (Eoff) at 600V/300A. The co- design of the power module and the gate driver enables optimizing the IPMs for lowest switching energies by carefully tuning dV/dt and controlling voltage overshoots inherent to fast switching.
New high current variable test power supplies
he test engineering division of REO has developed the REOLAB 220, a range of three-phase high current, low voltage AC variable power supplies for test laboratories. The units can supply voltages of up to 10 V and currents up to 10kA (10,000 Amps), but this can be tailored to meet customer requirements. REO UK is providing the REOLAB 220 units to test and quality assurance laboratories in the UK High current, low voltage power supplies find their way into test
laboratories for several reasons, and the REOLAB 220 boasts several benefits. The unit can rapidly regulate voltage variations and the current set-points can be adjusted either manually or automatically, with a clean, sinusoidal output current throughout the adjustment range. High current AC is often using to test fuses, cables, terminals and other connections, where testing at the rated current and voltage is difficult or not required. Stepping the voltage down allows the current to increase for a given power, providing greater flexibility in where the tests can be carried out. Safety is ensured as the test voltage is usually below 50 V and is isolated from the mains due to the use of a step-down isolation transformer.
“The testing of fuses for quality assurance often requires the fuses to be ran at a given current with deviation within acceptable limits,” says Steve Hughes, managing director of REO
36 June 2021
UK. “However, with fixed power supply,
The Reverse Bias Safe Operating Aera (RBSOA) authorizes peak currents up to 600A with DC bus voltages up to 880V making the power modules perfectly safe for 800V battery applications.
340A. The On resistance is equal to 3.25mOms. Turn-on and turn-off switching energies are respectively 8.42mJ and 7.05mJ at 600V and 300A. The power module is cooled down through an AlSiC flat baseplate. Thermally robust, the module is rated for 175°C junction temperature and the gate driver for 125°C ambient temperature.
SiC Intelligent Power Modules with flat (left) and pin fin (right) baseplate
The new-air cooled module is designed for applications where liquid cooling is not an option, like aerospace electromechanical actuators and power converters, for example. This module is rated for a blocking voltage of 1200V and a Maximum Continuous Current of
“We initially developed this IPM platform to accelerates SiC-based motor drives development for E-Mobility and we are also very pleased to see demand from aerospace customers” says Dave Hutton, CEO at CISSOID. “We are delighted to deliver this new SiC intelligent power module designed for natural convection or forced cooling in compact and lightweight power converters addressing these new demanding markets.”
cissoid.com
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fluctuations can occur due to temperature, load regulation and input voltage.
“Unless the current is automatically adjusted to compensate for these fluctuations, it can mean that lengthy burn-in or soak tests may need to be repeated. The REOLAB 220 is able to help test labs to avoid this. REO’s range of products can be driven to a setpoint or required output, often using a potentiometer or even over a fieldbus, and will regulate about that setting regardless of changing load or input conditions.” REO UK can provide the barebones system or provide a complete turnkey package for integration into a quality assurance system. The range is also not limited to high current AC. High voltages up to 8 kV can also be provided with a maximum power limit of 1 MV or 800 kW for DC systems.
reo.co.uk/news Components in Electronics
Two power supplies extend output options
elonic Instruments offers the latest 2kW models, expanding Kikusui’s popular PWR- 01 range of benchtop
power supplies
Two models have been added to the Kikusui PWR-01 series which are available in the UK from Telonic Instruments.
The 0-40V, 0-200A PWR2001L and 0-80V, 0-100A PWR2001ML are the latest members of the PWR-01 programmable benchtop DC power supply series.
The two latest models bring the total number of power supplies in the series to 14. The PWR-01 series offers four maximum outputs and outputs of 400W, 800W, 1200W and 2000W.
Power supplies in the PWR-01 family are equipped with LAN (LXI), USB and RS232C interfaces as standard. Sequences can be set with an embedded CPU or via analogue control. The PWR-01 power supplies have front-facing output terminals as well as rear terminals, variable internal resistance, bleeder circuit ON/OFF, CC/ CV priority switching, synchronised operation, programmable internal memory, and protection functions for use. Like the earlier members, the PWR2001L and PWR2001ML have
variable internal impedance, a soft- start function to limit inrush current, programmable internal memory and synchronised operation for complex sequence testing over multiple channels. They can be used with Wavy sequence creation software to create actuator or sensor simulations, and the rise/fall of power supplies in multiple channels. The power supplies provide flexible current and voltage for a variety of applications in a wide range of industries, including automotive, aerospace and energy.
The rugged power supplies have a guaranteed operating temperature of up to 50°C (122°F).
The PWR-01 series, including the latest additions - the PWR2001L and PWR2001ML – are available now from Telonics Instruments.
telonic.co.uk www.cieonline.co.uk
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