Innovative MOSFET design drives redundancy modules

6th June 2014

Mick Elliott

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There is a new MOSFET technology design at the heart of PULS YR-series of redundancy modules which are now available at BEC Distribution. These new DIN-Rail Power Supply Redundancy Modules are aimed at critical applications where failure of the 24V power supply is not tolerable, and redundancy - where two or more supplies are paralleled - is the preferred fail-safe solution.

In many conventional systems, diodes at the output of each supply ensure decoupling and isolation but suffer the problem of high inherent loss. At 20A load the loss per diode is around 10W in turn producing significant heat.

The new MOSFET design is for load currents of 20-80A and input voltages from 12-60V. MOSFETs undertake the task of decoupling and significantly reduce the losses found in units using a conventional output diode design.

When power supplies need to be operated in parallel, the load current must be distributed evenly over the individual power supplies to ensure thermal equilibrium and high reliability. PULS power supplies now have a selectable “parallel use” mode for this application to provide automatic current distribution between the units. With this feature current distribution is loss-free and therefore does not affect the redundancy concept.

The PULS YR Series is fully protected against short circuit or even reverse polarity, is covered by a portfolio of international standards, hot swapping capability and is housed in a compact and rugged housing to conserve space on the DIN Rail.