DC-DC converters with high isolation

13 September 2017 Power Electronics / Power Management

Murata has introduced a series of high isolation DC-DC converters developed by Murata Power Solutions. The MGJ6 wide, low-profile series converters feature a 14 mm creepage and clearance distance for use in reinforced rated, isolated gate drive power applications in higher efficiency 690 V a.c. industrial electrical distribution systems. They provide optimised voltages for best system performance and efficiency.

This high isolation DC-DC converter series is designed for powering high- and low-side gate drive circuits for IGBTs and silicon and silicon carbide MOSFETs in bridge circuits used in motor control applications and industrial power installations. Rated at 6 W, the dual output converters provide a wide 2:1 input voltage range with nominal values of 5, 12 and 24 V, and with output voltages of 15/-10 V, 20/-5 V and 15/-5 V.

Suitable for power applications that require a DC link voltage up to 3 kV d.c., asymmetric outputs provide an optimum drive level to maintain a high system efficiency with low EMI levels. With their frequency synchronisation capability and very low coupling capacitance, typically 13 pF, EMC compliance is easier.

The converters’ compact design reduces board space and development time, whilst their characterised dV/dt immunity of 80 kV/microsecond gives users confidence in a long service life, and similarly the use of planar magnetics increases product reliability and repeatability of performance. Typical applications include motor drives/motion control, solar inverters, UPS, alternative energy (wind-power generators), high-power AC-DC conversion, traction, EV/HEV and welding.

The MGJ6 series converters offer an operating temperature range of -40°C to 105°C, with derating above 90°C. Standard features of the patent protected converters include enable pin, short circuit and overload protection, and a frequency synchronisation pin that simplifies EMC filter design.

For more information contact Pieter Engelbrecht, Avnet South Africa, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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