Low-loss MOSFET redundancy module simplifies critical equipment power supply requirements
15 October 2010
PULS UK has introduced a 24V low loss MOSFET redundancy module to protect vital equipment. The YR80 is designed to ensure that only one redundancy module is needed to build a 40A redundant system. A conventional redundancy system incorporates two power supplies connected in parallel, each being capable of handling the load should the other fail (1+1 redundancy). For higher output currents N+1 redundancy systems are employed, meaning that in the case of a 120A load, four 40A power supplies are used so that if one fails the remaining three units can safely supply the required power. In both examples the power supplies are protected using diodes which consume large amounts of energy especially in those applications with higher loads. The power losses can be very high and can create heat problems requiring the use of large heat sinks.
With PULS' YR80, the diodes have been replaced by MOSFET devices for the first time, delivering a number of significant benefits. For example, the low on-resistance of the MOSFET ensures a considerably lower voltage drop than with diodes: at 40A output current a drop of only 50mV is present between the input and output terminals - with traditional diodes a drop of at least 500mV would occur. This not only saves energy but also reduces the heat generated making cooling much less of a problem. The YR80 produces losses of only 2.7W at 40A output current including losses at the terminals, the internal wiring and the supply circuit meaning that a heat sink is not required.
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