IC693CPU374 | GE FANUC | Traditional redundant power supply module

Description

IC693CPU374 | GE FANUC | Traditional redundant power supply module

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The traditional redundant power supply IC693CPU374 design scheme consists of two or more power supplies connected in parallel to the power bus via diode anodes in an OR gate manner. As shown in Figure 1. It is possible to have one power source work alone or multiple power sources work simultaneously. When one of the power supplies fails, the unidirectional conduction characteristic of the diode will not affect the output of the power bus.

In actual redundant power supply IC693CPU374 , the current is generally relatively high, reaching several tens of A. Considering the power consumption of the diode itself, Schottky diodes with low voltage drop and high current are generally selected, such as SR1620 to SR1660 (rated current of 16 A). Usually, heat sinks need to be installed on these diodes to facilitate heat dissipation.

The traditional IC693CPU374  of using diodes has simple circuits, but it has inherent drawbacks such as high power consumption, severe heat generation, the need to install heat sinks, and a large footprint. Due to the high current in the circuit, the diode is mostly in forward conduction mode, and the power consumption caused by its voltage drop cannot be ignored. The Schottky diode with the minimum voltage drop also has a power consumption of 0.45 V, which is 5 W at high currents, such as 12 A, so special attention should be paid to heat dissipation.

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